JP2013185671A - Angle adjustment metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a fall-off prevention means of a wedge member provided on an angle adjustment metal fitting.SOLUTION: In an angle adjustment metal fitting 10, a first arm 1 having a receiving face 3z is connected with a second arm 9 having a gear plate 9L in which a gear 9La is formed to a peripheral part thereof so that the second arm 9 is connected to be rotatable around the center of a rotational axis O and relative to the first arm 1 in forward and reverse directions S, G. A space 5 is formed between a receiving face 3z and the gear 9La. A wedge member 7 is disposed in a space 5 to prevent rotation in the reverse direction G of the second arm 9. The wedge member 7 has a tooth face 7a meshed with the gear 9La and an abutment face 7c abutting on the receiving face 3z. Furthermore, a restriction part 7L is integrally formed to the wedge member 7 to abut on at least one of right and left side faces 9Lb, 9Lc of the gear plate part 9L to restrict movement in at least one direction out of right and left directions of the wedge member 7.

Description

  The present invention relates to an angle adjustment fitting used for a reclining chair (eg, a seat chair) and the like and a reclining chair using the angle adjustment fitting.

  As an angle adjusting bracket for adjusting the tilt angle of the back frame in a reclining chair such as a seat chair or a vehicle seat, for example, JP 2010-155088 (Patent Document 1) and JP 2010-240461 (Patent Document 2). ) Is known.

  The angle adjusting brackets of Patent Documents 1 and 2 include a first arm and a second arm, and the first arm is a part of an inner peripheral surface of a case portion and a wedge-shaped window portion formed in the case portion. The second arm includes a gear plate portion having a gear portion formed on the peripheral edge portion. The first arm and the second arm are coupled so that the second arm can rotate in both forward and reverse directions relative to the first arm around the rotation axis. The gear portion is formed along an arc line centered on the rotation axis. A wedge-shaped space is formed between the receiving surface and the gear portion, and a wedge member having a tooth surface meshing with the gear portion and a contact surface contacting the receiving surface is movably disposed in the space. Yes. The angle adjusting bracket includes a wedge member sandwiched between the receiving surface and the gear portion in a state where the tooth surface of the wedge member meshes with the gear portion and the contact surface of the wedge member contacts the receiving surface. The second arm is configured to prevent rotation in the reverse direction by the wedge action.

  Japanese Patent Laying-Open No. 2010-88682 (Patent Document 3) discloses an angle adjusting bracket having a configuration similar to the angle adjusting bracket described in Patent Documents 1 and 2.

JP 2010-155088 A JP 2010-240461 A JP 2010-88682 A

  By the way, in the angle adjusting brackets of Patent Documents 1 and 2, there is a risk that the wedge member may inadvertently move in the left-right direction and fall off from the wedge-shaped window portion. Therefore, as a means for preventing the wedge member from falling off, the case portion is used. A fall-off prevention cover is provided so as to surround the left and right outer sides.

  However, since this drop-off prevention cover is formed separately from the other parts constituting the angle adjusting bracket, the number of components of the angle adjusting bracket is increased. When the number of parts increases, problems such as an increase in the number of manufacturing steps of the angle adjusting bracket may occur.

  The problem to be solved by the present invention is to provide a new structure for the means for preventing the wedge member from falling off provided in the angle adjusting bracket, and particularly preferably, the number of components of the angle adjusting bracket can be reduced as much as possible. The object of the present invention is to provide a new configuration of the dropout prevention means.

  The present invention provides the following means.

[1] A first arm having a receiving surface and a second arm having a gear plate portion having a gear portion formed on a peripheral portion thereof, the second arm is formed on the first arm around a rotation axis. In contrast, it is connected so as to be rotatable in both forward and reverse directions,
In a space formed between the receiving surface and the gear portion, a wedge member having a tooth surface meshing with the gear portion and a contact surface contacting the receiving surface is disposed,
The wedge member is an angle adjusting bracket in which the tooth surface meshes with the gear portion and the contact surface contacts the receiving surface to prevent the second arm from rotating in the reverse direction.
The angle characterized in that the wedge member is integrally formed with a restricting portion that contacts at least one of the left and right side surfaces of the gear plate portion and restricts the movement of the wedge member in at least one of the left and right directions. Adjustment bracket.

  [2] The wedge member has a left restricting portion that contacts the left side surface of the gear plate portion as a restricting portion and restricts the rightward movement of the wedge member, and a right side surface of the gear plate portion. 2. The angle adjusting bracket according to item 1, wherein a right restricting portion that contacts and restricts the movement of the wedge member in the left direction is integrally formed.

[3] The second arm includes, as the gear plate portion, a left gear plate portion and a right gear plate portion that are spaced apart from each other in the left-right direction and arranged in a substantially parallel shape.
The wedge member, as the restricting portion, abuts against the left side surface of the left gear plate portion and restricts the movement of the wedge member in the right direction, and contacts the right side surface of the right gear plate portion. 2. The angle adjusting bracket according to item 1, wherein a right restricting portion for restricting the leftward movement of the wedge member is integrally formed.

[4] The second arm includes, as the gear plate portion, a left gear plate portion and a right gear plate portion that are spaced apart from each other in the left-right direction and are arranged substantially parallel to each other.
The restricting portion is disposed between the left and right gear plate portions, contacts the right side surface of the left gear plate portion, contacts the left side of the wedge member, and contacts the left side surface of the right gear plate portion. 2. The angle adjusting bracket according to item 1, wherein the wedge member is restricted from moving rightward.

[5] The first arm includes a receiving plate portion disposed to face the gear portion, and a pair of left and right opposing left and right plate portions bent from left and right side edges of the receiving plate portion. And a receiving member made of a bent molded product of a U-shaped metal plate having
The receiving plate portion of the receiving member has a plate surface facing the gear portion side as the receiving surface,
The gear plate portion is disposed between both side plate portions of the receiving member,
The wedge member is disposed in the space and between both side plate portions of the receiving member,
The restricting portion is in contact with the left side surface of the gear plate portion and restricts the rightward movement of the wedge member, and the leftward movement of the wedge member is the left side plate of the receiving member. Regulated by the department, or
The restricting portion is in contact with the right side surface of the gear plate portion and restricts the leftward movement of the wedge member, and the rightward movement of the wedge member is the right side plate of the receiving member. The angle adjustment metal fitting of the preceding clause 1 controlled by a part.

[6] The gear plate portion is formed with a bulging portion bulging on at least one side in the left-right direction,
The bulging portion is in contact with a side plate portion arranged on a side where the bulging portion bulges out of both side plate portions of the receiving member,
6. The angle adjusting bracket according to claim 5, wherein the restricting portion is disposed in a gap formed by the bulging portion between the side plate portion and the gear plate portion with which the bulging portion abuts. .

  [7] The seat frame is connected to the first arm of the angle adjusting bracket according to any one of the preceding items 1 to 6, and the back frame is connected to the second arm of the angle adjusting bracket. Reclining chair.

  The present invention has the following effects.

  In the angle adjusting bracket of the preceding item [1], since the restricting portion is integrally formed with the wedge member, it is possible to prevent the wedge member from falling off due to the movement of the wedge member in at least one of the left and right directions. The number of components of the angle adjusting bracket can be reduced as compared with the case where the restricting portion is formed separately from the wedge member.

  In the preceding item [2], the wedge member can be prevented from falling off due to the movement of the wedge member in the right direction and the left direction by the left restricting portion and the right restricting portion.

  In the preceding item [3], since the second arm includes the left gear plate portion and the right gear plate portion that are spaced apart from each other as the gear plate portion, the meshing state between the tooth surface of the wedge member and the gear portion is stabilized. Can increase the sex. Further, the left restricting portion and the right restricting portion can prevent the wedge member from falling off due to the movement of the wedge member in the right direction and the left direction.

  In the preceding item [4], since the second arm includes the left gear plate portion and the right gear plate portion that are spaced apart from each other as the gear plate portion, the meshing state between the tooth surface of the wedge member and the gear portion is stabilized. Can increase the sex. Furthermore, it is possible to prevent the wedge member from falling off due to the movement of the wedge member in the right direction and the left direction by the restriction portion disposed between the left and right side plate portions of the member.

  In the preceding item [5], since the second arm includes a receiving member made of a bent product of a U-shaped metal plate having a receiving plate portion and left and right side plate portions, the receiving member is easily manufactured. be able to.

  Further, when the second arm is prevented from rotating in the reverse direction, a large load is applied to the receiving surface (plate surface) of the receiving plate portion of the receiving member from the wedge member. Is reinforced by being bent. Therefore, even if the thickness of the receiving plate portion is not necessarily increased, the load can be firmly received by the plate portion. Thereby, the rotation of the second arm in the reverse direction can be reliably prevented.

  In addition, the restricting portion restricts the rightward movement of the wedge member, and the leftward movement of the wedge member is restricted by the left side plate portion of the receiving member, or the restricting portion is the wedge member. Since the movement of the wedge member in the right direction is restricted by the right side plate portion of the receiving member, the movement of the wedge member by the movement of the wedge member in the right direction and the left direction is restricted. Dropout can be prevented.

  In the previous item [6], the contact friction force and the contact area between the both side plate portions and the gear plate portion of the receiving member can be changed by increasing or decreasing the bulge amount or bulge area of the bulge portion. Therefore, the force required for the rotation operation of the second arm can be reliably adjusted to an appropriate value by increasing or decreasing the bulging amount or the bulging area of the bulging portion.

  Further, since the restricting portion is disposed in the gap formed by the presence of the bulging portion between the side plate portion with which the bulging portion abuts and the gear plate portion, the restricting portion is disposed on the side plate portion and the gear plate. Inhibition of the movement of the wedge member due to being sandwiched between the wedge portion and the tooth surface of the wedge member and the gear portion is prevented, and the movement of the wedge member at the time of release is performed smoothly.

  In the reclining chair of the preceding item [7], the angle adjusting bracket of the reclining chair has the above effects.

FIG. 1 is a perspective view showing a seat chair provided with an angle adjusting bracket according to the first embodiment of the present invention. FIG. 2 is a perspective view of the same angle adjusting bracket. FIG. 3 is a plan view of the same angle adjusting bracket. 4 is a cross-sectional view taken along line Z1-Z1 in FIG. 5A is an enlarged plan view of a cross section taken along line Z2-Z2 in FIG. FIG. 5B is an enlarged plan view of a cross section corresponding to FIG. 5A when the wedge member shown in FIG. 5A is moved rightward. FIG. 5C is an enlarged plan view of a cross-section corresponding to FIG. 5A when the wedge member shown in FIG. 5A is moved leftward. FIG. 6A is an exploded perspective view of the same angle adjustment fitting. FIG. 6B is an exploded perspective view of the same angle adjustment fitting as seen from another direction. FIG. 7 is a cross-sectional view of the receiving member of the same angle adjusting bracket. FIG. 8A is a perspective view of a wedge member of the same angle adjustment fitting. FIG. 8B is a perspective view of the wedge member viewed from another direction. FIG. 9 is a perspective view of the same angle adjusting bracket during assembly. FIG. 10 is an enlarged cross-sectional view of a main part of the same angle adjusting bracket. FIG. 11A is a cross-sectional view of the same angle adjustment fitting with the second arm prevented from rotating in the reverse direction. FIG. 11B is a cross-sectional view of a state in the middle of rotating the second arm in the forward direction from the state of FIG. 11A. FIG. 11C is a cross-sectional view of a state where the reverse rotation of the second arm is prevented from the state of FIG. 11B. FIG. 11D is a cross-sectional view showing a state where rotation in the reverse direction is prevented with respect to the second arm rotated to the maximum in the forward direction in the same angle adjustment fitting. FIG. 11E is a cross-sectional view of the state in the middle of pressing the wedge member toward the expanding side of the wedge-shaped space by the pressing protrusion of the second arm from the state of FIG. 11D. FIG. 11F is a cross-sectional view of the state in which the wedge member is pushed into the holding recess and held by the pressing protrusion of the second arm from the state of FIG. 11E. FIG. 11G is a cross-sectional view of the state in the middle of rotating the second arm in the reverse direction from the state of FIG. 11F. FIG. 11H is a cross-sectional view of a state in which the wedge member held in the holding recess in the same angle adjustment fitting is being pushed out from the holding recess by the extrusion protrusion of the second arm. FIG. 12A is a perspective view showing a first modification of the wedge member. FIG. 12B is an enlarged plan view of a cross section corresponding to FIG. 5A in the angle adjustment fitting provided with the wedge member. FIG. 13A is a perspective view showing a second modification of the wedge member. FIG. 13B is an enlarged plan view of a cross section corresponding to FIG. 5A in the angle adjustment fitting provided with the wedge member. FIG. 14 is a perspective view of an angle adjusting bracket according to the second embodiment of the present invention. FIG. 15 is an exploded perspective view of the same angle adjusting bracket.

  Next, several embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the angle adjusting bracket 10 according to the first embodiment of the present invention is used for a seat chair 20 as a reclining chair, for example. The seat 20 includes a seat frame 21 as one member and a back frame 22 as the other member. The seat frame 21 and the back frame 22 are each formed of a metal round pipe bent in a substantially U shape. The rear end portions of the left and right side frame portions 21a, 21a of the seat frame 21 and the lower end portions of the left and right side frame portions 22a, 22a of the back frame 22 are respectively a pair of left and right angle adjusting brackets 10, 10 of the first embodiment. The back frame 22 can be tilted with respect to the seat frame 21 within an angle range from a deployed state to a standing state.

  As shown in FIGS. 6A and 6B, the angle adjusting bracket 10 of the first embodiment includes a first arm 1, a second arm 9, a wedge member 7, a biasing spring 8, and the like. The first arm 1 and the second arm 9 are connected to each other so that the second arm 9 can rotate in both forward and reverse directions relative to the first arm 1 around the rotation axis O.

  In the present embodiment, the direction along the rotation axis O of the angle adjusting bracket 10 is the left-right direction of the angle adjusting bracket 10 and its constituent members.

  The first arm 1 is attached to a seat frame 21, and includes a first arm main body 2, a receiving member 3 that receives a wedge member 7, and a holding plate 4. The first arm main body 2, the receiving member 3 and the holding plate 4 are formed separately from each other, and the receiving member 3 and the holding plate 4 are formed by a rod-shaped rotating shaft 9 j and a connecting shaft 2 f made of rivets having a circular cross section. The first arm main body 2 is connected in a fixed state. Therefore, the first arm 1 includes the receiving member 3 and the holding plate 4 in a fixed state. The rotation axis O consists of the center of the rotation axis 9j.

  As shown in FIGS. 6A and 6B, the first arm main body 2 is formed of a bent product of a metal plate formed by bending a single metal plate such as a steel plate into a predetermined shape. A substantially cylindrical seat frame mounting portion 2a that is fixedly attached to the rear end portion of each of the left and right side frame portions 21a, and the left and right sides integrally formed with the rear end portion of the seat frame mounting portion 2a. A pair of left and right plate-like left outer wall portion 2b and right outer wall portion 2b arranged in parallel and a plate-like bottom wall portion 2c in which the lower ends of the front portions of both outer wall portions 2b and 2b are connected to each other (see FIG. 4). The upper part and the rear part between both outer wall parts 2b and 2b are opened.

  The receiving member 3 is formed of a bent molded product formed by bending a single metal plate such as a steel plate into a U-shaped cross section, and includes a receiving plate portion 3a and both left and right edges of the receiving plate portion 3a. It has a pair of left and right opposing left and right side plate portions 3L and 3R that are bent. Both side plate portions 3L and 3R are spaced apart from each other in the left-right direction and arranged in parallel. The receiving member 3 is disposed between the outer wall portions 2b and 2b of the first arm main body 2 and is connected to the first arm main body 2 in a fixed state by the connecting shaft 2f and the rotating shaft 9j in this state. Has been.

  The configuration of the holding plate 4 will be described later.

  The second arm 9 is attached to the back frame 22 and is connected to the first arm 1 so as to be rotatable in both forward and reverse directions relative to the first arm 1 around the rotation axis O as described above. Has been.

  Here, in the first embodiment, for convenience of explanation, as shown in FIG. 4, the forward and reverse rotation directions of the second arm 9 relative to the first arm 1 (first arm main body portion 2) are changed with respect to the first arm 1. The rotation direction in which the opening angle θ of the two arms 9 is reduced, that is, the folding direction of the second arm 9 with respect to the first arm 1 is referred to as “positive rotation direction S” or simply “positive direction S”. The rotation direction in which the opening angle θ of the arm 9 increases, that is, the deployment direction of the second arm 9 relative to the first arm 1 is referred to as “reverse rotation direction G” or simply “reverse direction G”.

  The second arm 9 is formed of a bent product of a metal plate formed by bending a single metal plate such as a steel plate into a predetermined shape, and is a lower end of each of the left and right side frame portions 22a of the back frame 22. A cylindrical back frame mounting portion 9a that is fixedly attached to the bottom frame, and a pair of left and right left gear plate portions 9L and right gear plate portions that are integrally formed at the lower end of the back frame mounting portion 9a. 9R.

  As shown in FIGS. 6A and 6B, the left and right gear plate portions 9L and 9R have the same shape and the same size, and are arranged in parallel in a slightly spaced manner in the left-right direction. A rotation shaft hole 9i having a circular cross section is provided at the center of each of the left and right gear plate portions 9L and 9R. Further, a right bulging portion 9Rd having an octagonal shape in a side view is formed on the peripheral portion of the rotation shaft hole 9i in the right gear plate portion 9R so as to slightly bulge locally on the right side by embossing. Similarly, a left bulging portion 9Ld (see FIGS. 3 and 5A) having an octagonal shape in a side view is slightly bulged locally on the left side by embossing at the periphery of the rotation shaft hole 9i in the left gear plate portion 9L. Is formed.

  2, 3 and 5A, both the gear plate portions 9L, 9R of the second arm 9 are disposed between the outer side wall portions 2b, 2b of the first arm body portion 2, and this state Thus, the rotation shaft holes 2e and 2e provided in the outer wall portions 2b and 2b of the first arm main body 2 and the rotation shaft holes 9i and 9i of the gear plate portions 9L and 9R of the second arm 9, respectively. The rotary shaft 9j is inserted in a state where these rotary shaft holes 2e, 2e, 9i, 9i are communicated. As a result, the second arm 9 is pivotally supported by the rotation shaft 9j, and the second arm 9 is formed on the first arm 1 (specifically, the first arm body 2 and the receiving member 3) with the rotation axis O as the center. On the other hand, it is connected to the first arm 1 via a rotating shaft 9j so as to be relatively rotatable in both forward and reverse directions S and G.

  As shown in FIGS. 6A, 6B and 10, the outer peripheral edge of the left gear plate portion 9L of the second arm 9 on the first arm 1 side has a plurality of tooth portions 9d arranged at a predetermined pitch in the circumferential direction. A gear portion 9La is formed. Similarly, a gear portion 9Ra composed of a plurality of tooth portions 9d arranged at a predetermined pitch in the circumferential direction is formed on the outer peripheral edge portion of the right gear plate portion 9R of the second arm 9 on the first arm 1 side. . The number of the tooth portions 9d is, for example, 5 to 25 (more specifically, for example, 15 to 20).

  As shown in FIG. 10, the two gear portions 9La and 9Ra are not formed along an arc line Co (shown by a one-dot chain line) centering on the rotation axis O (that is, the center of the rotation shaft hole 9i), It is formed along a circular arc line C1 (shown by a one-dot chain line) centered on a position P1 shifted substantially downward with respect to the rotation axis O.

  The radius Ro of the arc line Co is not limited, but is set according to the size of the angle adjusting bracket 10, and the radius R1 of the arc line C1 is not limited. For example, it is set in a range of 0.9 to 1.3 times the radius Ro of the arc line Co. The shift amount of the center P1 of the arc line C1 with respect to the rotation axis O is not limited, and is set according to the size of the angle adjusting bracket 10 and the like.

  As shown in FIGS. 4 and 10, the receiving plate portion 3 a of the receiving member 3 is disposed so as to face the left and right gear portions 9 La and 9 Ra of the second arm 9 slightly apart from each other. A wedge-shaped space 5 is formed between the receiving surface 3z of the receiving plate portion 3a and the gear portions 9La and 9Ra. The receiving surface 3z is composed of a plate surface facing the both gear portions 9La and 9Ra in the receiving plate portion 3a. The wedge-shaped space 5 is narrowed on the upper side and widened on the lower side, and the wedge-shaped space 5 is formed such that its width W gradually decreases in the reverse rotation direction G of the second arm 9. . In the first embodiment, the width W of the wedge-shaped space 5 is a distance between the receiving surface 3z in the wedge-shaped space 5 and both the gear portions 9La and 9Ra in a side view.

  The receiving surface 3z of the receiving plate portion 3a is a surface that is received by contact with a contact surface 7c, which will be described later, of the wedge member 7, and is also referred to as a “wedge surface” and does not intersect with both the gear portions 9La and 9Ra. Are arranged as follows.

  Here, as described above, both the gear portions 9La and 9Ra are formed along the arc line C1 centered on the position P1 shifted downward from the rotational axis O (that is, on the expanding side of the wedge-shaped space 5). Therefore, as can be seen from FIG. 10, both the gear portions 9La and 9Ra are formed such that the width W of the wedge-shaped space 5 gradually decreases as the second arm 9 rotates in the reverse direction G. That is, as the second arm 9 rotates in the reverse direction G, the two gear portions 9La and 9Ra gradually approach the receiving surface 3z and the width W of the wedge-shaped space 5 decreases.

  As shown in FIG. 5A, both side plate portions 3L, 3R of the receiving member 3 are inside the outer side wall portions 2b, 2b of the first arm main body portion 2 and between the gear plate portions 9L, 9R of the second arm 9. Arranged outside. Therefore, the gear plate portions 9L and 9R are disposed between the side plate portions 3L and 3R of the receiving member 3.

  Furthermore, the bulging portions 9Ld and 9Rd of the gear plate portions 9L and 9R abut against the side plate portions 3L and 3R of the corresponding receiving member 3, respectively, and the side plate portions 3L and 3R of the receiving member 3 and the gear plate portions. The gaps 6L and 6R are formed between the 9L and 9R by the presence of the bulging portions 9Ld and 9Rd, respectively. That is, the left bulge portion 9Ld of the left gear plate portion 9L abuts on the right side surface 3La of the left plate portion 3L of the receiving member 3, and the left bulge portion 9Ld between the left plate portion 3L and the left gear plate portion 9L. A gap 6L is formed due to the presence of. The gap 6L communicates with the wedge-shaped space 5. Similarly, the right bulge portion 9Rd of the right gear plate portion 9R abuts on the left side surface 3Ra of the right plate portion 3R of the receiving member 3, and the right bulge portion 9Rd is interposed between the right plate portion 3R and the right gear plate portion 9R. As a result, the gap 6R is formed. The gap 6R communicates with the wedge-shaped space 5.

  4, 5A and 10, the wedge member 7 is movable in the length direction of the wedge-shaped space 5 in the wedge-shaped space 5 and between the side plate portions 3L, 3R of the receiving member 3. That is, the wedge-shaped space 5 can be moved between the narrow side and the wide side) and is also referred to as a “floating wedge member”.

  The wedge member 7 is made of metal such as steel, and a tooth surface 7a that meshes with both the gear portions 9La and 9Ra is formed on the surface of the wedge member 7 facing the both gear portions 9La and 9Ra. As shown in FIG. 8A, the tooth surface 7a is composed of one tooth portion 7b, or a pitch corresponding to the pitch of the tooth portions 9d and 9d of the gear portions 9La and 9Ra in the length direction of the wedge member 7. It consists of a plurality of tooth portions 7b arranged in a row. The number of the tooth portions 7b is smaller than the number of the tooth portions 9d of each gear portion, for example, 1 to 8. In the first embodiment, the number of teeth 7b is 2-6.

  As shown in FIGS. 8B and 10, the surface of the wedge member 7 facing the receiving surface 3z is formed into a surface that is curved in a substantially arc shape or a surface that is bent in a square shape, and abuts on the receiving surface 3z. A contact surface 7c is formed.

  Then, as shown in FIG. 10, the wedge member 7 is moved to the narrow side of the wedge-shaped space 5, its tooth surface 7a meshes with both the gear portions 9La, 9Ra, and its contact surface 7c is the receiving plate portion. The second arm 9 is prevented from rotating in the reverse direction G by being sandwiched between the receiving surface 3z and the gear portions 9La and 9Ra in a state of being received in contact with the receiving surface 3z of 3a. On the other hand, when the wedge member 7 is moved to the spreading side of the wedge-shaped space 5, the tooth surface 7a does not mesh with both the gear portions 9La and 9Ra, and the rotation of the second arm 9 in the reverse direction G is allowed. .

  Further, as shown in FIGS. 8A and 8B, at either one of the left and right end portions of the wedge member 7, a plate-like restricting portion 7L protruding toward the both gear plate portions 9L and 9R from the tooth surface 7a is integrated. Is formed. In the first embodiment, the restricting portion 7 </ b> L is integrally formed with the left end portion of the wedge member 7. As shown in FIG. 5A, the restricting portion 7L is disposed in a gap 6L formed by the left bulging portion 9Ld between the left gear plate portion 9L and the left plate portion 3L of the receiving member 3. Has been. The width of the gap 6L is set slightly larger than the thickness of the restricting portion 7L.

  As shown in FIGS. 5A and 5B, the restricting portion 7 </ b> L restricts the movement of the wedge member 7 in the right direction by coming into contact with the left side surface 9 </ b> Lb of the left gear plate portion 9 </ b> L as a constituent portion of the second arm 9. Is. On the other hand, the leftward movement of the wedge member 7 is restricted by at least one of the wedge member 7 and the restriction portion 7L coming into contact with the right side surface 3La of the left side plate portion 3L of the receiving member 3 as shown in FIG. 5C. The In the first embodiment, the wedge member 7 and the restricting portion 7L both come into contact with the right side surface 3La of the left side plate portion 3L, whereby the movement of the wedge member 7 in the left direction is restricted.

  As shown in FIGS. 6A and 6B, the holding plate 4 is separate from the receiving member 3 and is formed from a single metal plate such as a steel plate, and moves to the spreading side (ie, the lower side) of the wedge-shaped space 5. The wedge member 7 has a holding recess 4e that holds the tooth surface 7a in a state where the tooth surface 7a does not mesh with both the gear portions 9La and 9Ra.

  The holding plate 4 is disposed in parallel with the side plate portions 3L and 3R on the side of the wedge-shaped space 5 between the side plate portions 3L and 3R of the receiving member 3. A holding recess 4 e is cut out at the edge of the holding plate 4 facing the wedge-shaped space 5 (more specifically, the upper edge), with the opening facing the wedge-shaped space 5. Further, as shown in FIGS. 4 and 10, the holding plate 4 abuts on the bottom wall 2 c of the first arm main body 2 and is arranged upright on the bottom wall 2 c.

  As shown in FIGS. 6A and 6B, an engaging recess 4 f that opens substantially upward is cut out at an end edge of the holding plate 4 on the receiving plate portion 3 a side (more specifically, an upper end edge). On the other hand, an engaging recess 3g that opens substantially downward is cut out at the intermediate portion in the left-right direction of the end edge portion (more specifically, the lower end edge portion) on the holding plate 4 side of the receiving plate portion 3a of the receiving member 3. Yes. Then, as shown in FIG. 9, the engaging recess 4f of the holding plate 4 and the engaging recess 3g of the receiving plate portion 3a are fitted to each other, whereby the holding plate 4 is located at the lower edge of the receiving plate portion 3a. It is engaged with the middle part in the left-right direction so as not to move in the left-right direction.

  Further, the end 4 a on the holding plate 4 on the side of the receiving plate 3 a is disposed between the ends 3 c and 3 c (that is, the lower end) on the side of the holding plate 4 in the side plates 3 L and 3 R of the receiving member 3. . In this state, the connecting shaft holes 4b, 3d, and 3d provided in the end portions 4a, 3c, and 3c and the connecting shaft holes provided in the outer wall portions 2b and 2b of the first arm main body 2, respectively. The connecting shaft 2f is inserted through the connecting shaft holes 4b, 3d, 3d, 2d, and 2d into the state 2d and 2d. As a result, the end 4a on the receiving plate 3a side of the holding plate 4 and the end 3c, 3c on the holding plate 4 side on both side plates 3L and 3R of the receiving member 3 are connected to each other via the connecting shaft 2f. In addition, these end portions 4a, 3c, and 3c are connected to both outer side wall portions 2b and 2b of the first arm main body portion 2 through a connecting shaft 2f.

  Further, the end portions 3e, 3e on the rotating shaft 9j side of the both side plate portions 3L, 3R of the receiving member 3 are disposed on the left and right outer sides of the both gear plate portions 9L, 9R of the second arm 9, and the holding plate 4 Is disposed between the gear plate portions 9L and 9R (see FIGS. 3 and 4). In this state, as shown in FIGS. 6A and 6B, the rotation shaft 9j is connected to the rotation shaft holes 4d, 3f, and 3e provided in the end portions 4c, 3e, and 3e, respectively. 3f (see FIG. 5A), the end portions 3e and 3e on the rotating shaft 9j side of both side plate portions 3L and 3R of the receiving member 3 and the end of the holding plate 4 on the rotating shaft 9j side The part 4c is connected via a rotating shaft 9j.

  Therefore, the receiving member 3 and the holding plate 4 are coupled to the first arm main body 2 in a fixed state via the coupling shaft 2f and the rotating shaft 9j. On the other hand, the second arm 9 is pivotally supported by a rotation shaft 9j so as to be rotatable relative to the first arm main body 2, the receiving member 3, and the holding plate 4.

  The biasing spring 8 constantly biases the wedge member 7 disposed in the wedge-shaped space 5 toward the both gear portions 9La and Ra. As shown in FIGS. 6A and 6B, the biasing spring 8 is formed of a torsion coil spring having a pair of left and right coil portions 8a and 8a that are divided into two at the intermediate portion in the left-right direction of the biasing spring 8. The two coil portions 8a and 8a are integrally connected to each other via a connecting spring wire portion 8b as an intermediate portion formed between them.

  As shown in FIG. 9, both the coil portions 8 a and 8 a of the urging spring 8 are arranged in a state of straddling the end portion 4 a on the receiving plate portion 3 a side of the holding plate 4 and the urging spring 8. The connecting spring wire portion 8b is inserted and held in a locking groove portion 4g as a locking portion formed at the bottom of the engaging recess 4f of the holding plate 4. In this state, both coil portions 8a, 8a of the urging spring 8 are extrapolated and held by the connecting shaft 2f. Further, as shown in FIG. 10, the linear end portions 8c, 8c of the coil portions 8a, 8a of the urging spring 8 are brought into contact with the wedge member 7 by the torsional elastic restoring force generated in each coil portion 8a. The left and right ends of 7c are uniformly pressed against each other, whereby the wedge member 7 is constantly urged toward the both gear portions 9La and 9Ra.

  Here, since the locking groove 4g is formed at the bottom of the engaging recess 4f of the holding plate 4, the connecting spring line portion 8b of the urging spring 8 locked to the locking groove 4g is the receiving plate portion. The engagement recess 3g of 3a can prevent accidental extraction from the locking groove 4g.

  As shown in FIGS. 6A, 6B and 7, the receiving plate 3a of the receiving member 3 is formed with a reinforcing bead 3h that bulges toward the receiving surface 3z. The reinforcing bead portion 3h reinforces the receiving plate portion 3a, and the width W dimension of the wedge-shaped space 5 is finely adjusted.

  Further, at the terminal portion of the second arm 9 in the forward rotation direction S in each gear portion 9La, 9Ra, the wedge member 7 moved to the narrowing side of the wedge-shaped space 5 is pressed to the spreading side of the wedge-shaped space 5 to hold the holding plate A pressing protrusion 9f that is pushed into the four holding recesses 4e protrudes radially outward from the gear portions 9La and 9Ra and is integrally formed.

  On the other hand, the wedge member 7 disposed in the holding recess 4e of the holding plate 4 is pushed out into the wedge-shaped space 5 from the holding recess 4e at the terminal portion of the second arm 9 in the reverse rotation direction G in the gear portions 9La and 9Ra. The extrusion protrusion 9e is integrally formed so as to protrude radially outward from the gear portions 9La and 9Ra.

  In addition, a wedge member 7 meshed with both the gear portions 9La and 9Ra is rotated in the positive direction S of the second arm 9 at the end of the holding recess 4e of the holding plate 4 on the opening side of the side edge on the rotating shaft 9j side. The guide step 4h that guides in a direction away from both the gear portions 9La and 9Ra against the biasing force of the biasing spring 8 by operation protrudes outward from the positions of the both gear portions 9La and 9Ra and is inclined downward. It is formed in the state. When the second arm 9 is rotated in the forward direction S, the wedge member 7 meshed with both the gear portions 9La and 9Ra is guided and moved in a direction away from the both gear portions 9La and 9Ra by the guide step portion 4h. Thus, the meshing between the tooth surface 7a of the wedge member 7 and the two gear portions 9La and 9Ra is released.

  Next, operation | movement of the angle adjustment metal fitting 10 of this 1st Embodiment is demonstrated below with reference to FIG.

  In the angle adjustment fitting 10 shown in FIG. 11A, the second arm 9 is disposed at about 175 ° which is the maximum opening angle θ with respect to the first arm 1, that is, the second arm 9 is attached to the first arm 1. On the other hand, it is arranged in an expanded state. When the wedge member 7 is moved to the narrow side of the wedge-shaped space 5, the tooth surface 7a of the wedge member 7 is engaged with both gear portions 9La and 9Ra of the second arm 9, and the contact surface 7c of the wedge member 7 is received. The member 3 is received in contact with the receiving surface 3z. Further, the wedge member 7 is urged toward the both gear portions 9La and 9Ra by the urging force of the urging spring 8, and the tooth surface 7a is pressed against the both gear portions 9La and 9Ra. In this state, the wedge member 7 is sandwiched between the receiving surface 3z and the gear portions 9La and 9Ra, and the wedge member 7 prevents the second arm 9 from rotating in the reverse direction G.

  Further, in this state, the restricting portion 7L of the wedge member 7 is disposed in a gap 6L formed between the left gear plate portion 9L and the left plate portion 3L of the receiving member 3 (see FIG. 5A). The movement of the wedge member 7 in the right direction is restricted by the restriction portion 7L coming into contact with the left side surface 9Lb of the left gear plate portion 9L (see FIG. 5B). On the other hand, the wedge member 7 and the restricting portion 7L both come into contact with the right side surface 3La of the left side plate portion 3L of the receiving member 3, whereby the movement of the wedge member 7 in the left direction is restricted (see FIG. 5C).

  Further, in the state shown in FIG. 11A, the stopper portion 9g provided at the lower end edge of the rear wall portion of the second arm 9 is connected to the first arm 1 (specifically, the rear of the holding plate 4 of the first arm 1). It is arranged close to the stopper portion 4i provided on the edge). As a result, even if an overload in the reverse rotation direction G is applied to the second arm 9, the rotation of the second arm 9 in the reverse direction G causes the stopper portion 9 g of the second arm 9 to By striking against the stopper portion 4i of the arm 1, it is blocked more firmly. In addition, if the second arm rotates in the reverse direction G, the width W of the wedge-shaped space 5 is reduced, so that the wedge member 7 is strongly sandwiched between the receiving surface 3z and both the gear portions 9La and 9Ra. As a result, the rotation of the second arm 9 in the reverse direction G is more firmly prevented.

  When the second arm 9 is slightly rotated in the positive direction S from the state shown in FIG. 11A, the wedge member 7 is expanded on the side of the wedge-shaped space 5 as the second arm 9 rotates forward as shown in FIG. 11B. The wedge member 7 is guided to the receiving plate portion 3a against the urging force of the urging spring 8 when the wedge member 7 abuts against the guide step portion 4h. As a result, the wedge member 7 Between the tooth surface 7a and the gear portions 9La and 9Ra is released.

  Further, by rotating the second arm 9 in the forward direction S, as shown in FIG. "Make a noise." When the second arm 9 rotates in the reverse direction G under this meshing state, the wedge member 7 is slightly moved to the narrow side of the wedge-shaped gap 5 along with the reverse rotation operation, and the contact surface of the wedge member 7 7c is received in contact with the receiving surface 3z, and the wedge member 7 is sandwiched between the receiving surface 3z and the gear portions 9La and 9Ra. Due to the wedge action of the wedge member 7, the rotation of the second arm 9 in the reverse direction G is prevented.

  As the second arm 9 is rotated in the positive direction S in this way, the tooth surface 7a of the wedge member 7 is meshed with the gear portions 9La and 9Ra one after another. Further, as the second arm 9 rotates in the positive direction S, the width W of the wedge-shaped space 5 gradually increases.

  In the angle adjustment fitting 10 shown in FIG. 11D, the second arm 9 is arranged at a position rotated to the maximum in the positive direction S with respect to the first arm 1, and the opening angle of the second arm 9 with respect to the first arm 1. θ is about 105 °. In this state, the wedge member 7 is moved to the narrow side of the wedge-shaped space 5, the tooth surface 7a of the wedge member 7 is engaged with both the gear portions 9La and 9Ra, and the contact surface 7c of the wedge member 7 is the receiving surface 3z. It is received in contact with. Further, the wedge member 7 is urged toward the both gear portions 9La and 9Ra by the urging force of the urging spring 8, and the tooth surface 7a is pressed against the both gear portions 9La and 9Ra. In this state, the wedge member 7 is sandwiched between the receiving surface 3z and the gear portions 9La and 9Ra, and the wedge member 7 prevents the second arm 9 from rotating in the reverse direction G.

  When the second arm 9 is rotated in the positive direction S from the state shown in FIG. 11D, as shown in FIG. 11E, the wedge member 7 is moved into the wedge-shaped space by the pressing protrusion 9f as the second arm 9 rotates forward. The wedge member 7 is moved toward the holding recess 4e of the holding plate 4 by being pressed toward the spreading side 5 and the wedge member 7 comes into contact with the guide step portion 4h in the middle of the wedge member 7 so that the biasing spring 8 is attached. The wedge member 7 is guided to the receiving plate portion 3a side against the force, and as a result, the meshing between the tooth surface 7a of the wedge member 7 and the two gear portions 9La and 9Ra is released. Further, by rotating the second arm 9 in the positive direction S, as shown in FIG. 11F, the wedge member 7 is pushed into the holding recess 4e by the pressing projection 9f, and the wedge member 7 is thus urged spring. 8, the tooth surface 7a is held in a state where it does not mesh with both the gear portions 9La and 9Ra, and the second arm 9 is allowed to rotate in the reverse direction G. Further, when the wedge member 7 pressed by the pressing protrusion 9f comes into contact with the bottom of the holding recess 4e, further rotation of the second arm 9 in the positive direction S is prevented.

  Further, in this state, the stopper portion 9h provided at the front end edge portion of the front wall portion of the second arm 9 is connected to the first arm 1 (specifically, the receiving plate portion 3a of the receiving member 3 of the first arm 1). It is disposed close to the stopper portion 3j provided on the upper edge). As a result, even if an overload in the positive rotation direction S is applied to the second arm 9, the second arm 9 rotates in the positive direction S so that the stoppered portion 9h of the second arm 9 By striking against the stopper portion 3j of the arm 1, it is blocked more firmly.

  In the state shown in FIG. 11F, since the second arm 9 is allowed to rotate in the reverse direction G as described above, the second arm 9 can be rotated in the reverse direction G as shown in FIG. 11G. .

  In the angle adjusting bracket 10 shown in FIG. 11H, the wedge member 7 is disposed and held in the holding recess 4e, and its tooth surface 7a is not meshed with both the gear portions 9La and 9Ra, so the second arm 9 is in the reverse direction. The rotation of G is permitted. From this state, the second arm 9 disposed in a substantially unfolded state with respect to the first arm 1 is strongly rotated in the reverse direction G, whereby the wedge member 7 is moved from the holding recess 4e to the wedge-shaped gap 5 by the pushing projection 9e. Push to the side. Then, the wedge member 7 has its tooth surface 7a meshed with both the gear portions 9La and 9Ra by the urging force of the urging spring 8, and the wedge member 7 is narrowed in the wedge-shaped space 5 as the second arm 9 rotates backward. The contact surface 7 c of the wedge member 7 is received in contact with the receiving surface 3 z of the receiving member 3. As a result, as shown in FIG. 11A, the wedge member 7 is sandwiched between the receiving surface 3z and the gear portions 9La and 9Ra, and the wedge member 7 acts in the reverse direction G of the second arm 9 in the reverse direction G. Rotation is prevented.

  Thus, the angle adjustment fitting 10 of the first embodiment has the following advantages.

  According to this angle adjusting bracket 10, the rotation of the second arm 9 in the reverse direction G is prevented only by the tooth surface 7 a of the wedge member 7 meshing with both the gear portions 9 La and 9 Ra of the second arm 9. In addition, the tooth surface 7a meshes with both the gear portions 9La and 9Ra, and the contact surface 7c of the wedge member 7 is blocked by being received in contact with the receiving surface 3z of the receiving plate portion 3a of the receiving member 3. Therefore, when the second arm 9 is prevented from rotating in the reverse direction G, the load applied to the tooth portions 9d of both the gear portions 9La and 9Ra can be reduced. For this reason, the tooth portions 9d of the gear portions 9La and 9Ra can be reduced, and the number of the tooth portions 9d can be increased. As a result, the number of angle adjustment steps can be increased.

  Further, since the receiving member 3 of the first arm 1 is formed of a bent metal product having a U-shaped cross section having a receiving plate portion 3a and both side plate portions 3L, 3R, the receiving member 3 can be easily manufactured. Can do.

  Further, the second arm 9 includes a left gear plate portion 9L and a right gear plate portion 9R that are arranged apart from each other as gear plate portions. As a result, the tooth surface 7a of the wedge member 7 and the gear portions 9La, 9Ra are engaged at two positions on the left and right sides of the tooth surface 7a of the wedge member 7, so the tooth surface 7a of the wedge member 7 and the gear portions 9La, 9Ra It is possible to improve the stability of the meshing state.

  Further, the tooth surface 7a of the wedge member 7 is engaged with both the gear portions 9La and 9Ra, and the contact surface 7c of the wedge member 7 is received in contact with the receiving surface 3z of the receiving plate portion 3a of the receiving member 3. Since the rotation of the second arm 9 in the reverse direction G is blocked, a large load is applied from the wedge member 7 to the receiving plate portion 3a of the receiving member 3 when the rotation of the second arm 9 in the reverse direction G is blocked. However, the receiving plate portion 3a is reinforced by bending the left and right side plate portions 3L and 3R from the left and right side edges. Therefore, even if the thickness of the receiving plate portion 3a is not necessarily increased, the load can be received firmly by the plate portion 3a. Thereby, the angle adjustment fitting 10 can be reduced in size (and further reduced in weight), and the rotation of the second arm 9 in the reverse direction G can be reliably prevented.

  Moreover, the contact surface 7c of the wedge member 7 is not received by a surface formed by a part of the inner peripheral surface of the wedge-shaped window portion formed in the case portion as in the angle adjusting brackets of Patent Documents 1 and 2. Since it is received by the receiving surface 3z formed by the plate surface of the receiving plate portion 3a of the receiving member 3, the contact surface 7c of the wedge member 7 can be received stably.

  Furthermore, in the first embodiment, since the restricting portion 7L is formed at the left end portion of the wedge member 7, the restricting portion 7L abuts on the left side surface 9Lb of the left gear plate portion 9L, so that the right direction of the wedge member 7 is reached. Can be restricted (see FIG. 5B). Furthermore, the wedge member 7 and the restricting portion 7L are in contact with the right side surface 3La of the left side plate portion 3L of the receiving member 3, whereby the movement of the wedge member 7 in the left direction can be restricted (see FIG. 5C). Therefore, it is possible to prevent the wedge member 7 from dropping from the wedge-shaped space 5 due to the movement of the wedge member 7 in the right direction and the left direction.

  In the first embodiment, the left and right outer side wall portions 2b and 2b of the first arm main body 2 are used instead of the side plate portions 3L and 3R, even if the side plate portions 3L and 3R are not provided in the receiving member 3. Since it exists, at least one of the wedge member 7 and the restricting portion 7L comes into contact with the right side surface of the left outer wall portion 2b, whereby the movement of the wedge member 7 in the left direction can be restricted.

  Further, since the restricting portion 7L is integrally formed with the wedge member 7, the number of components of the angle adjusting bracket 10 can be reduced as compared with the case where the restricting portion 7L is formed separately from the wedge member 7. .

  Further, the left bulge portion 9Ld bulging to the left is formed on the left gear plate portion 9L of the second arm 9, and the right bulge portion 9Rd bulging to the right is formed on the right gear plate portion 9R. The contact friction force and the contact area between the both side plate portions 3L, 3R of the receiving member 3 and the gear plate portions 9L, 9R are changed by increasing or decreasing the bulge amount or the bulge area of each of the bulge portions 9Ld, 9Rd. can do. Therefore, the force required for the rotation operation of the second arm 9 can be reliably adjusted to an appropriate value by increasing or decreasing the bulging amount or the bulging area of each of the bulging portions 9Ld and 9Rd.

  Further, since the restricting portion 7L is disposed in the gap 6L formed by the left bulging portion 9Ld between the left plate portion 3L and the left gear plate portion 9L of the receiving member 3, the restricting portion 7L Is prevented from interfering with the movement of the wedge member 7 by being sandwiched between the left side plate portion 3L and the left gear plate portion 9L, so that the tooth surface 7a of the wedge member 7 and the gear portions 9La and 9Ra are engaged and released. The movement of the wedge member 7 at the time can be performed smoothly.

  Furthermore, since both the gear portions 9La and 9Ra are formed so that the width W of the wedge-shaped space 5 decreases as the second arm 9 rotates in the reverse direction G, when the second arm 9 rotates in the reverse direction G, The width W of the wedge member 5 is reduced, and the wedge member 7 is strongly sandwiched between the receiving surface 3z and the gear portions 9La and 9Ra. Thereby, the rotation of the second arm 9 in the reverse direction G can be firmly prevented.

  Further, since both the gear portions 9La and 9Ra are formed along the arc line C1 with the position P1 shifted from the rotation axis O as the center, the two gear portions 9La and 9Ra are wedge-shaped as the second arm 9 rotates in the reverse direction G. The width W of the space 5 can be reliably reduced. Therefore, the rotation of the second arm 9 in the reverse direction G can be reliably prevented.

  Further, in the seat 20 of the first embodiment, a predetermined portion of the seat frame 21 is provided on the seat frame mounting portion 2a of the first arm 1 (first arm main body portion 2) of the angle adjusting bracket 10 of the first embodiment. While being fixedly attached and connected, a predetermined portion of the back frame 22 is attached and connected to the back frame attaching portion 9a of the second arm 9 in a fixed state. Therefore, in the seat chair 20, the angle adjusting bracket 10 has the same effect as the above effect.

  Here, in the first embodiment, the restricting portion 7L is integrally formed with the left end portion of the wedge member 7. However, in the present invention, for example, the restricting portion 7L is not the left end portion of the wedge member 7, but the right end portion. May be integrally formed. In this case, the restricting portion 7L is disposed in a gap 6R formed by the presence of the right bulging portion 9Rd between the right side plate portion 3R and the right gear plate portion 9R of the receiving member 3. The restricting portion 7L is in contact with the right side surface 9Rc of the right gear plate portion 9R, so that the movement of the wedge member 7 in the left direction is restricted, and at least one of the wedge member 7 and the restricting portion 7L is The movement of the wedge member 7 in the right direction is restricted by contacting the left side surface 3Ra of the right side plate portion 3R.

  Further, in this way, it is desirable that the restricting portion 7L is formed integrally with either the left end portion or the right end portion of the wedge member 7. The reason is as follows. When manufacturing the wedge member 7 with the restricting portion 7L by press molding and sintering, a mold having a molding cavity corresponding to the desired wedge member 7 with the restricting portion 7L is prepared, and the molding cavity of this die is prepared. The metal powder is filled in and pressed with a punch to form a green compact, and then the green compact is taken out of the forming cavity and sintered to obtain a desired wedge member 7 with a regulating portion 7L. Get. In such a manufacturing method by press molding and sintering, when the restricting portion 7L is formed integrally with either the left end portion or the right end portion of the wedge member 7, the structure of the mold forming cavity is simplified. In addition, the green compact can be easily taken out from the molding cavity.

  12A and 12B are views for explaining a first modified example of the wedge member in the angle adjusting bracket 10 of the first embodiment.

  In the first modified example, the wedge member 70 is integrally formed with a pair of left and right opposing restricting portions 7L and 7R. That is, the left restricting portion 7L is integrally formed at the left end portion of the wedge member 70, and the right restricting portion 7R is integrally formed at the right end portion of the wedge member 70. The left restricting portion 7L is in contact with the left side surface 9Lb of the left gear plate portion 9L and restricts the rightward movement of the wedge member 7 as in the first embodiment. The left bulging portion 9Ld is disposed in the gap 6L formed between the portion 3L and the left gear plate portion 9L. The right restricting portion 7R abuts on the right side surface 9Rc of the right gear plate portion 9R to restrict the movement of the wedge member 7 in the left direction. The right restricting portion 7R, the right gear plate portion 9R, Between the gaps 6R formed by the presence of the right bulging portion 9Rd.

  According to the wedge member 70, the left restricting portion 7L and the right restricting portion 7R can prevent the wedge member 70 from dropping off due to the movement of the wedge member 70 in the right and left directions. In the wedge member 70, the wedge member 7 can be prevented from falling off without the side plate portions 3L and 3R in the receiving member 3.

  13A and 13B are views for explaining a second modification of the wedge member in the angle adjustment fitting 10 of the first embodiment.

  In the second modification, a restricting portion 7M protrudes and is integrally formed at the intermediate portion in the left-right direction of the tooth surface 7a of the wedge member 71. The restricting portion 7M is disposed between the two gear plate portions 9L and 9R, contacts the right side surface 9Lc of the left gear plate portion 9L, and moves the wedge member 7 in the left direction and the right gear plate portion 9R. It abuts against the left side surface 9Rb and restricts the movement of the wedge member 7 in the right direction.

  According to the wedge member 71, the wedge member 7 can be prevented from falling off due to the rightward and leftward movement of the wedge member 7 by the restricting portion 9M disposed between the gear plate portions 9L and 9R. In the wedge member 71, the wedge member 7 can be prevented from falling off without the side plate portions 3L and 3R in the receiving member 3.

  14 and 15 are views for explaining an angle adjustment fitting 10 according to a second embodiment of the present invention.

  The angle adjustment fitting 10 of the second embodiment includes a cover body 15. The cover body 15 is made of, for example, resin, and a locking piece 15a is integrally formed at one end thereof. Then, the locking piece 15 a is locked to the lower edge portion from the outer surface side of the receiving plate portion 3 a of the receiving member 3, so that the cover body 15 has the gears 9 L and 9 R of the second arm 9. The parts 9La and 9Ra and the wedge member 7 are attached to the angle adjusting bracket 10 in such a manner as to cover them from above.

  Other configurations of the angle adjustment fitting 10 of the second embodiment are the same as those of the first embodiment.

  Although several embodiments of the present invention have been described above, the present invention is not limited to those shown in the above embodiments, and various modifications can be made.

  In the present embodiment, the number of gear plate portions of the second arm 9 is two. However, in the present invention, the number of gear plate portions is not limited to two, and is, for example, one. May be.

  The angle adjusting bracket according to the present invention is particularly preferably used for a reclining chair such as a seat chair or a vehicle seat, but is not limited thereto, and in addition, a footrest, headrest, It can be used for armrests, etc., and it can also be used for metal fittings that adjust the angle of panels such as liquid crystal display panels. That is, one member and the other member are connected so that the angle formed by both members can be adjusted arbitrarily. It can be used for joint metal fittings.

  INDUSTRIAL APPLICABILITY The present invention can be used for angle adjustment fittings used for reclining chairs (eg, seat chairs, vehicle seats) and beds (eg, foldable beds), and reclining chairs.

1: first arm 2: first arm main body 2b, 2b: left and right outer walls 3: receiving member 3a: receiving plate 3z: receiving surface 3L: left plate 3La: right side 3R of left plate: right side Plate portion 3Ra: Left side surface of right side plate portion 4: Holding plate 5: Wedge-shaped space 6L, 7R: Gap 7, 70, 71: Wedge member 7a: Tooth surface 7c: Abutment surface 7L, 7R, 7M: Restricting portion 8: Biasing spring 9: second arm 9L: left gear plate portion 9La: left gear portion 9Lb: left side surface 9Lc of left gear plate portion: right side surface 9Ld of left gear plate portion: left bulge portion 9R: right gear plate portion 9Ra : Right gear portion 9Rb: Left side surface 9Rc of right gear plate portion: Right side surface 9Rd of right gear plate portion: Right bulge portion O: Rotating shaft center 20: Seat chair (reclining chair)

Claims (7)

A first arm provided with a receiving surface and a second arm provided with a gear plate part having a gear part formed at a peripheral part thereof are relative to the first arm about the rotation axis. Are connected so that they can rotate in both forward and reverse directions,
In a space formed between the receiving surface and the gear portion, a wedge member having a tooth surface meshing with the gear portion and a contact surface contacting the receiving surface is disposed,
The wedge member is an angle adjusting bracket in which the tooth surface meshes with the gear portion and the contact surface contacts the receiving surface to prevent the second arm from rotating in the reverse direction.
The angle characterized in that the wedge member is integrally formed with a restricting portion that contacts at least one of the left and right side surfaces of the gear plate portion and restricts the movement of the wedge member in at least one of the left and right directions. Adjustment bracket.   The wedge member has, as the restricting portion, a left restricting portion that abuts on the left side surface of the gear plate portion and restricts the rightward movement of the wedge member, and a wedge member that abuts on the right side surface of the gear plate portion. The angle adjusting bracket according to claim 1, wherein a right restricting portion for restricting movement of the member in the left direction is integrally formed. The second arm includes, as the gear plate portion, a left gear plate portion and a right gear plate portion that are spaced apart from each other in the left-right direction and arranged in a substantially parallel shape,
The wedge member, as the restricting portion, abuts against the left side surface of the left gear plate portion and restricts the movement of the wedge member in the right direction, and contacts the right side surface of the right gear plate portion. The angle adjusting bracket according to claim 1, wherein a right restricting portion for restricting the leftward movement of the wedge member is integrally formed. The second arm includes, as the gear plate portion, a left gear plate portion and a right gear plate portion that are spaced apart from each other in the left-right direction and arranged in a substantially parallel shape,
The restricting portion is disposed between the left and right gear plate portions, contacts the right side surface of the left gear plate portion, contacts the left side of the wedge member, and contacts the left side surface of the right gear plate portion. 2. The angle adjusting bracket according to claim 1, wherein the wedge member restricts the rightward movement of the wedge member. The first arm includes a receiving plate portion disposed to face the gear portion, and a cross section having a pair of left and right opposing left and right plate portions bent from left and right side edges of the receiving plate portion. While having a receiving member made of a bent product of a U-shaped metal plate,
The receiving plate portion of the receiving member has a plate surface facing the gear portion side as the receiving surface,
The gear plate portion is disposed between both side plate portions of the receiving member,
The wedge member is disposed in the space and between both side plate portions of the receiving member,
The restricting portion is in contact with the left side surface of the gear plate portion and restricts the rightward movement of the wedge member, and the leftward movement of the wedge member is the left side plate of the receiving member. Regulated by the department, or
The restricting portion is in contact with the right side surface of the gear plate portion and restricts the leftward movement of the wedge member, and the rightward movement of the wedge member is the right side plate of the receiving member. The angle adjusting bracket according to claim 1, wherein the angle adjusting bracket is restricted by the portion. The gear plate portion is formed with a bulging portion bulging on at least one side in the left-right direction,
The bulging portion is in contact with a side plate portion arranged on a side where the bulging portion bulges out of both side plate portions of the receiving member,
The angle adjustment according to claim 5, wherein the restricting portion is disposed in a gap formed by the bulging portion existing between the side plate portion and the gear plate portion with which the bulging portion is in contact. Hardware.   A reclining chair, wherein a seat frame is connected to the first arm of the angle adjusting bracket according to any one of claims 1 to 6, and a back frame is connected to the second arm of the angle adjusting bracket. .

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