JP2013011061A - Lock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock device capable of making vehicle-body-assembly-direction dimensions small.SOLUTION: A latch spring 73 is wound around an outer periphery of a base-side latch regulation part 71b or an outer periphery of a holder-side latch regulation part 22a; either a lock spring 74 or a cam spring 75 is wound around either an outer periphery of a base-side lock regulation part 72b or an outer periphery of a holder-side lock regulation part 22b; and the other one of the lock spring 74 and the cam spring 75 is wound around the other one of the outer periphery of the base-side lock regulation part 72b and the outer periphery of the holder-side lock regulation part 22b.

Description

  The present invention relates to a lock device for fixing a backrest of a seat supported by swinging to a vehicle body.

  As a conventional locking device for fixing the backrest of a vehicle seat to a vehicle body, there are those disclosed in Patent Literature 1 and Patent Literature 2. As shown in FIG. 14, the lock device 101 of Patent Documents 1 and 2 is fixed to the housing 160 having the base plate 110 and the base plate 110, and a pair that rotatably supports the latch 130 and the blocking component 140. The cylindrical support members 171 and 172 are fixed to a structural component (not shown) of the seat with bolts or the like penetrating the cylindrical support members 171 and 172. Further, the striker (not shown) is guided to the inside while the latch 130 and the shut-off component 140 rotate, and when the rotation is completed, the latch 130 and the shut-off component 140 are locked in the reverse rotation direction. The striker is held inside. .

Special table 2007-517721 gazette Special table 2007-518000 gazette

  By the way, in the configuration of Patent Document 1, the shut-off component 140 and the clamp eccentric member 150 are disposed on the same cylindrical support member 172, and the shut-off component 140 and the clamp eccentric member 150 are engaged with the latch 130. Since the springs 174 and 175 urging in the mating direction are arranged in the axial direction of the same cylindrical support member 172, there is a problem that the axial dimension of the entire apparatus becomes large. In Patent Document 1, the connecting plate 120 that supports the distal ends of the pair of cylindrical support members 171 and 172 is provided, but one spring 175 of the springs 174 and 175 is arranged outside the connecting plate 120. Further, the spring 173 urges the latch 130 in a direction to engage the latch 130 and release the striker, but is disposed outside the connecting plate 120. Therefore, the holding ring 180 is required to prevent the springs 173 and 175 from falling off, and there are problems that the number of parts increases and the axial dimension of the cylindrical support member 172 further increases.

  In the configuration of Patent Document 2, weight reduction is achieved by forming a housing made of a soft material integrally with an insert member by insert molding. However, since the shape of the housing differs depending on the seat, it is difficult to share the housing. In addition, when the housing is formed in a small size, there is a problem that the outer peripheral flange of the housing gets in the way and the assemblability deteriorates.

  Then, an object of this invention is to provide the locking device which can make the dimension of a vehicle body assembly direction small.

  The invention according to claim 1 includes a latch-side support shaft having one end fixed to the base plate and the other end fixed to the holder plate, and a lock having one end fixed to the base plate and the other end fixed to the holder plate. Side support shaft, a latch rotatably disposed on the latch side support shaft between the base plate and the holder plate, and a lock side support shaft between the base plate and the holder plate. A movable cam member, a lock member, a latch spring that biases the latch in the direction of the open position, a lock spring that biases the lock member in the direction of engagement with the latch, and the cam member A locking device comprising a lock unit comprising a cam spring biased in an engagement direction with a latch, for determining an axial position of the latch with respect to the latch-side support shaft A base-side latch restricting portion which is provided on one end side of the latch-side support shaft and has a stepped portion set to have a larger diameter than a portion through which the latch of the latch-side support shaft is inserted; and the other end of the latch-side support shaft Set to a portion that is provided on the side and connects to the other end of the latch-side support shaft of the holder plate and protrudes toward the base plate side and has a larger diameter than the portion of the latch-side support shaft that is inserted through the latch A holder-side latch restricting portion formed of a stepped portion, provided on one end side of the lock-side support shaft to determine the cam member relative to the lock-side support shaft, and an axial position of the lock member, A base-side lock restricting portion comprising a step portion set to have a larger diameter than the cam member of the lock-side support shaft and a portion through which the lock member is inserted; and provided on the other end side of the lock-side support shaft. , The holder play The lock-side support shaft is connected to the other end of the lock-side support shaft and protrudes toward the base plate side, and the cam member of the lock-side support shaft and the portion through which the lock member is inserted are set to have a larger diameter. A holder-side lock restricting portion comprising a stepped portion, and the latch spring is wound around the outer periphery of the base-side latch restricting portion or the outer periphery of the holder-side latch restricting portion, and either the lock spring or the cam spring is And the other of the lock spring and the cam spring is wound around the outer periphery of the holder side lock restricting portion.

  According to a second aspect of the present invention, in the locking device according to the first aspect, the holder side lock restricting portion provided on the holder plate side and the holder side latch restricting portion are formed on the lock side of the holder plate by pressing. The lock-side support shaft and the end of the latch-side support shaft that are formed of a large-diameter portion that protrudes toward the base plate side around the support shaft and the coupling site with the latch-side support shaft. The portion is fixed by caulking in the concave portion on the back surface side of the large diameter portion.

  According to a third aspect of the present invention, in the locking device according to the first or second aspect, a linking projection is provided on one surface of the latch, and the latch and the locking member are respectively disposed on the same plane. The cam member has a peripheral surface that can be engaged with the linkage protrusion and is superimposed on the lock member, and the cam member is adjacent to the lock spring whose operating side end is locked to the lock member. The lock spring is wound around the outer periphery of the lock restricting portion, and the cam spring whose operating side end is locked to the cam member is wound around the outer periphery of the lock restricting portion on the side adjacent to the lock member. .

  According to a fourth aspect of the present invention, in the lock device according to any one of the first to third aspects, at least one of the base plate and the holder plate is provided with a spring hook portion projecting toward the other side, The fixed side ends of the latch spring, the lock spring, and the cam spring are respectively engaged with the spring hooks.

  According to a fifth aspect of the present invention, in the locking device according to any one of the first to fourth aspects, at least one of the base plate and the holder plate is provided with a stopper portion protruding toward the other side, and the latch At least one of the lock member and the cam member is engaged with the stopper portion at the rotation end, and a rotation range is defined.

  A sixth aspect of the present invention is the cover device according to any one of the first to fifth aspects, wherein the cover member has a substantially box shape with one surface opened, and the lock unit is detachably accommodated therein. It is characterized by having.

  According to a seventh aspect of the present invention, in the locking device according to the sixth aspect, the cover member is formed of a resin material, and an axial striker disposed outside is formed on the latch member so as to be detachable. A buffer portion extending from the cover member is disposed between the base plate and the striker inserted into the hook-shaped groove portion of the latch member located at the lock position. It is a feature.

  In the invention of claim 1, a latch spring, a cam spring, and a lock spring are provided on the outer periphery of the lock restricting portion that determines the axial position of the latch, the lock member, and the cam member relative to the support shaft between the base plate and the holder plate. Since there is no need to provide a member for fixing the spring, the axial dimension of the support shaft can be reduced, and the lock member and cam member can be secured while ensuring the operability of the spring. It can be supported in the axial direction.

  Since the latch, the lock member, the cam member, the latch spring, the lock spring, and the cam spring, which are components of the lock device, can be arranged between the base plate and the holder plate, the lock device can be unitized. In addition, since the base plate and the holder plate can have the minimum shape necessary for ensuring the strength, the entire apparatus can be reduced in size and weight.

  In the invention of claim 2, by utilizing the inside of the recess formed on the back side of the large diameter portion of the holder plate for caulking and fixing the holder plate and the support shaft, the two springs can be used without lengthening the support shaft. Since it can arrange | position and arrange in the axial direction of a support shaft, the dimension of the axial direction of the support shaft of the whole apparatus can be made small.

  In the invention of claim 3, in order to prevent rattling when the latch is rotated, the cam spring set stronger than the lock spring is disposed on the large-diameter portion on the lock member side that can secure a wide axial space. Thus, the axial space can be efficiently used, and the axial dimension of the support shaft of the entire apparatus can be further reduced.

  In addition, in the axial direction of the support shaft, the latch and the lock member are arranged on the same plane, and the cam member is placed on the lock member so as to be engaged with a protrusion protruding from one surface of the latch. Since the load is applied to each member with a good balance, the lock strength can be improved.

  In the invention of claim 4, since the spring hooking portion protrudes inward, there is nothing protruding outward from the side surface of the base plate or the holder plate. Therefore, the mounting surface of the seat component may be a flat surface, and there is no need to provide a relief or the like.

  In the invention of claim 5, since the stopper portion protrudes inward, there is nothing that protrudes outward from the side surface of the base plate or the holder plate. Therefore, the mounting surface of the seat component may be a flat surface, and there is no need to provide a relief or the like.

  In the invention of claim 6, since the cover member is provided separately from the lock unit and is detachable, it can be applied to various seats only by changing the cover member without changing the lock unit. The manufacturing cost can be reduced. Further, since the cover member can be assembled after the lock unit is assembled, the assembling workability can be improved.

  According to the seventh aspect of the present invention, since the buffer portion extending from the cover member made of a resin material is disposed between the base plate and the striker, the generation of abnormal noise is prevented without providing a separate damper. be able to.

1 is a perspective view of a locking device according to an embodiment of the present invention. 1 is an exploded perspective view of a lock device according to an embodiment of the present invention. 1 is a plan view of a locking device according to an embodiment of the present invention. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3, showing an embodiment of the present invention. It is a top view which shows one Embodiment of this invention and shows the state which assembled | attached the base plate to the cover. It is a top view showing signs that a locking device concerning one embodiment of the present invention carries out locking operation (release state). It is a top view showing signs that a locking device concerning one embodiment of the present invention performs locking operation (release state-> locked state (1)). It is a top view showing signs that a locking device concerning one embodiment of the present invention carries out locking operation (release state-> locked state (2)). It is a top view which shows a mode that the locking device which concerns on one Embodiment of this invention performs locking operation (locking state). It is a top view showing signs that a locking device concerning one embodiment of the present invention carries out release operation (locked state). It is a top view showing signs that a locking device concerning one embodiment of the present invention carries out release operation (lock state-> release state (1)). It is a top view showing signs that a locking device concerning one embodiment of the present invention carries out release operation (lock state-> release state (2)). It is a top view showing signs that a locking device concerning one embodiment of the present invention carries out release operation (release state). It is a disassembled perspective view which shows the conventional locking device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The lock device 1 of the present embodiment includes a lock unit 2 disposed on a backrest (not shown) of a seat that is swingably disposed, and a striker 3 disposed on the vehicle body side. 2 engages with the striker 3 to fix the backrest of the seat to the vehicle body (not shown).

  1 and 2, the lock unit 2 includes a base plate 10, a holder plate 20, a latch side support shaft 71, a lock side support shaft 72, a latch member 30, a lock member 40, a cam member 50, a latch spring 73, and a lock spring. 74 and a cam spring 75. Further, a cover member 60 is attached to the lock unit 2.

  As shown in FIGS. 2 and 5, the base plate 10 is made of a plate-shaped metal material having a substantially oval shape, and has a base side latch mounting hole 11a and a base side lock mounting hole at the center of each semicircular portion at both ends. 11b are provided. The base plate 10 includes a holding groove 12, a stopper 13, a latch spring hook 14a (spring hook), and a cam spring hook 14b (spring hook). The holding groove portion 12 is disposed between the mounting holes 11a and 11b, and is configured by a rectangular groove that opens in a direction intersecting the longitudinal direction of the ellipse. The opening portion of the holding groove portion 12 includes A guide corner portion 12b is provided that protrudes outward along the groove wall 12a. The stopper portion 13 is formed by bending a section extending in the plate surface direction of the base plate 10 toward the holder plate 20 at a substantially right angle. The latch spring hooking portion 14 a is configured by a through hole provided in a bent portion of an arm portion that constitutes the stopper portion 13. The stopper portion 15 is formed in the vicinity of the base side lock mounting hole 11b by bending a section extending in the plate surface direction of the base plate 10 to the holder plate 20 side at a substantially right angle. The cam spring hooking portion 14 b is formed by a notch provided on the side surface side of the bent portion of the arm portion constituting the stopper portion 15.

  The holder plate 20 is made of a plate-like metal material having a substantially oval shape, and is provided with a holder-side latch attachment hole 21a and a holder-side lock attachment hole 21b at the center of each semicircular portion at both ends. 2 and 4, the holder plate 20 includes a holder side latch restricting portion 22a, a holder side lock restricting portion 22b, a holding recess 23, a lock spring hooking portion 24 (spring hooking portion), and a fixed locking portion 25. Is provided. The holder-side latch restricting portion 22a is disposed around the holder-side latch mounting hole 21a, that is, at a portion where the holder plate 20 and the latch-side support shaft 71 are coupled, protrudes toward the base plate 10, and The step portion set to have a larger diameter than the portion through which the latch member 30 is inserted is formed by pressing. Similarly, the holder-side lock restricting portion 22b is disposed around the holder-side lock mounting hole 21b, that is, at a portion where the holder plate 20 and the lock-side support shaft 72 are coupled, protrudes toward the base plate 10, and lock-side support shaft. The stepped portion set to have a larger diameter than the portion through which the 72 cam members 50 and the lock member 40 are inserted is formed by pressing. And when the holder side latch control part 22a and the holder side lock control part 22b are pressed, the press recessed part 26 (recessed part) is formed in the outer surface side (back surface side) of the holder plate 20. FIG. The holding recess 23 is disposed between the mounting holes 21a and 21b, and is disposed at a position that substantially overlaps one side surface (the lock member 40 side) of the groove wall 12a of the base plate 10 in the axial direction. The lock spring hooking portion 24 is formed in the vicinity of the holder side lock mounting hole 21b by bending a section extending in the plate surface direction of the holder plate 20 to the base plate 10 side at a substantially right angle. The fixed locking portion 25 is formed by bending a section extending in the plate surface direction of the holder plate 20 at both ends in the longitudinal direction of the holder plate 20 at a substantially right angle toward the base plate 10 side. It is formed by a hole with a shape.

  The latch-side support shaft 71 has a substantially cylindrical shape, one end is inserted into a base-side latch mounting hole 11 a provided in the base plate 10 and fixed by projection welding, and the other end is provided on the holder side provided in the holder plate 20. It is inserted into the latch mounting hole 21a and fixed by crimping. Further, in a state of being fixed to the base plate 10 and the holder plate 20, adjacent to the end portion on the base plate 10 side, that is, the portion where the base plate 10 and the end portion of the latch side support shaft 71 are coupled, A base-side latch restricting portion 71b is formed that includes a step portion set to have a larger diameter than the latch-side rotation support portion 71a through which the latch member 30 is inserted.

  Similar to the latch side support shaft 71, the lock side support shaft 72 has a substantially cylindrical shape. One end of the lock side support shaft 72 is inserted into a base side lock mounting hole 11b provided in the base plate 10, and is fixed by projection welding. It is inserted into a holder side lock mounting hole 21b provided in the holder plate 20 and fixed by crimping. Further, in a state of being fixed to the base plate 10 and the holder plate 20, the lock side support shaft 72 is locked adjacent to the end portion on the base plate side, that is, adjacent to the portion where the base plate 10 and the end portion of the lock side support shaft 72 are coupled. A base-side lock restricting portion 72b is formed that includes a step portion set to have a larger diameter than the lock-side rotation support portion 72a through which the member 40 is inserted.

  The latch member 30 is made of a thick plate-like metal material, and the surface is covered with a resin material. The latch member 30 is provided with a latch insertion hole 31, a latch-side arcuate surface 32, a linkage protrusion 33, a hook-shaped groove 34, and a latch-side spring hook 35. The latch insertion hole 31 is set to have a hole diameter so that the latch side rotation support portion 71a is inserted into the latch insertion hole 31, and the latch member 30 is rotatably supported by the latch side rotation support portion 71a without rattling. ing. The latch-side arcuate surface 32 is formed on the plate thickness surface of the latch member 30 and is formed of an arcuate curved surface with the latch insertion hole 31 as the rotation center. The linking protrusion 33 protrudes from the surface of the latch member 30 on the holder plate 20 side, and is constituted by a columnar protrusion. The hook-shaped groove 34 is formed in a slit shape with one of the side walls formed in a hook shape, and the groove width is set so that the shaft-like striker 3 disposed on the vehicle body can be engaged and disengaged. . The latch-side spring hooking portion 35 is configured by a hook-like protrusion that extends along the rotation surface of the latch member 30. Further, a stopper receiving portion 36 that is in contact with the stopper portion 13 in a state of being located at the release position is set on the back side of the hook-shaped protrusion.

  The lock member 40 is made of a plate-like metal material, and is provided with a lock insertion hole 41, a lock surface 42, a lock-side spring hook 43, an operation arm 44, and an unlock release holding surface 45. The diameter of the lock insertion hole 41 is set so that the lock side rotation support portion 72a is inserted into the lock insertion hole 41 and the lock member 40 is rotatably supported by the lock side rotation support portion 72a without rattling. ing. The lock surface 42 is formed in the plate | board thickness surface of the lock member 40, and is comprised by the circular arc-shaped curved surface which makes the lock penetration hole 41 the rotation center. The lock-side spring hook portion 43 is configured by a hole that penetrates the lock member 40 in the plate thickness direction in an arm portion 46 extending along the rotation surface of the lock member 40. The operation arm 44 is configured by an arm portion extending along the rotation surface of the lock member 40. The lock release holding surface 45 is configured to be slidable with the latch-side arcuate surface 32 in a state where the latch member 30 is located at the release position.

  The cam member 50 is made of a plate-like metal material, and is provided with a cam insertion hole 51, a cam surface 52, a cam side spring hook portion 53, and a lock / cam linkage portion 54. The diameter of the cam insertion hole 51 is set so that the lock side rotation support part 72a is inserted into the cam insertion hole 51, and the cam member 50 is rotatably supported by the lock side rotation support part 72a without rattling. ing. The cam surface 52 is formed in the plate | board thickness surface of the cam member 50, and as shown in FIG. 3, it is comprised by the curved surface from which the radius is gradually increased clockwise centering | focusing on the cam insertion hole 51. As shown in FIG. The lock / cam linkage portion 54 is formed by bending the arm portion toward the lock member 40 at a substantially right angle so as to be positioned on the rotation surface of the cam member 50. The cam-side spring hook 53 is formed by bending the tip of an arm constituting the lock / cam linkage 54 in the direction of the rotation surface.

  The latch spring 73 is wound around the outer periphery of the base side latch restricting portion 71 b, one end (fixed side end portion) is hooked on the latch spring hooking portion 14 a of the base plate 10, and the other end (movable side end portion) is the latch member 30. By being hooked on the latch-side spring hook 35, the latch member 30 is biased from the lock position toward the release position (clockwise in FIG. 3).

  The lock spring 74 is wound around the outer periphery of the holder side lock restricting portion 22b, and one end (fixed side end) is hooked on the lock spring hooking portion 24 of the holder plate 20, and the other end (movable side end) is the lock member 40. The lock member 40 is urged toward the lock position direction (counterclockwise direction in FIG. 3) in which the lock member 40 is engaged with the latch member 30.

  The cam spring 75 is wound around the outer periphery of the base side lock restricting portion 72 b, one end (fixed side end) is hooked on the cam spring hooking portion 14 b of the base plate 10, and the other end (movable side end) is the cam member 50. By being hooked on the cam-side spring hook 53, the cam member 50 is biased toward the lock position direction (counterclockwise in FIG. 3) that engages with the linkage protrusion 33 of the latch member 30.

The spring constants of the latch spring 73, the lock spring 74, and the cam spring 75 are as follows:
(Cam spring)> (Latch spring)> (Lock spring)
It is set to become.

  The cover member 60 is made of a resin material having a substantially box shape whose one surface is open, and the lock unit 2 is detachably accommodated therein. As shown in FIG. 5, the cover member 60 is provided with a rib 61, a base engaging portion 62, a holder engaging portion 63, and a buffer portion 64. A plurality of ribs 61 are formed on the bottom inner surface of the cover member 60 and are in contact with the periphery of the base plate 10 with the lock unit 2 disposed in the cover member 60. Is prevented from shifting in the cover member 60. The base engaging portion 62 protrudes from the periphery of the cover member 60 and engages with the holding groove portion 12 of the base plate 10 in a state where the lock unit 2 is disposed in the cover member 60. Secure inside. The holder engaging portion 63 protrudes from the inner surface of the side wall of the cover member 60 and engages with the fixed locking portion 25 of the holder plate 20 in a state where the lock unit 2 is disposed in the cover member 60. Is fixed in the cover member 60. The buffer portion 64 extends from the periphery of the groove portion of the cover member 60 formed along the holding groove portion 12, and the bottom surface of the holding groove portion 12 of the base plate 10 and the lock position in a state where the lock unit 2 is disposed in the cover member 60. The buffer portion 64 is disposed so as to be sandwiched between the striker 3 inserted in the bowl-shaped groove portion 34 of the latch member 30 located at the position.

  Next, the assembly procedure of the locking device 1 of this embodiment will be described. First, the latch-side support shaft 71 and the lock-side support shaft 72 are inserted into the base-side latch mounting hole 11a and the base-side lock mounting hole 11b of the base plate 10, respectively, and are fixed by projection welding. Next, the latch spring 73 and the latch member 30 are arranged in this order on the latch side support shaft 71. The cam spring 75, the lock member 40, the cam member 50, and the lock spring 74 are arranged on the lock side support shaft 72 in this order. Next, the holder plate 20 is disposed, and the latch-side support shaft 71 and the lock-side support shaft 72 are passed through the holder-side latch mounting hole 21a and the holder-side lock mounting hole 21b. Note that a press recess 26 is formed on the outer surface side (back surface side) of the holder plate 20 when the holder side latch restricting portion 22a and the holder side lock restricting portion 22b are pressed. Then, using the press recess 26, the end portions on the holder plate 20 side of the latch-side support shaft 71 and the lock-side support shaft 72 that pass therethrough are caulked and fixed in the press recess 26.

  Thus, the lock unit 2 is completed. The cover member 60 is assembled to the completed lock unit 2, bolts (not shown) are inserted into holes penetrating the latch side support shaft 71 and the lock side support shaft 72, and the back of the seat (not shown) ( (Not shown).

  Next, operation | movement of the locking device 1 of this embodiment is demonstrated. First, in the unlocked state, as shown in FIG. 6, the latch member 30 is urged clockwise around the latch-side support shaft 71 by the urging force of the latch spring 73, while the stopper receiving portion 36 is moved to the base plate 10. By being in contact with the stopper portion 13, it is held at the release position. The lock member 40 is urged counterclockwise about the lock-side support shaft 72 by the urging force of the lock spring 74, and the lock release holding surface 45 abuts on the latch-side arc surface 32 of the latch member 30. , Held in the release position. The cam member 50 is urged counterclockwise about the lock side support shaft 72 by the urging force of the cam spring 75, and the lock / cam linkage portion 54 abuts on the operation arm 44 of the lock member 40. It is held in the release position.

  When the striker 3 is pushed into the holding groove 12 in such an unlocked state, as shown in FIG. 7, the striker 3 is pushed to rotate the latch member 30 counterclockwise, and the striker 3 is moved into the bowl-shaped groove. The latch-side arcuate surface 32 slides on the unlocking holding surface 45 while being retracted into 34. When the striker 3 is further pushed in, the latch member 30 rotates counterclockwise, and when the latch-side arcuate surface 32 is disengaged from the unlocking holding surface 45, as shown in FIG. However, the urging force of the lock spring 74 and the cam spring 75 respectively rotate counterclockwise, the lock surface 42 of the lock member 40 moves on the rotation locus of the latch member 30, and the linkage protrusion 33 of the latch member 30 is camped. It abuts on the cam surface 52 of the member 50.

  When the linkage protrusion 33 of the latch member 30 contacts the cam surface 52 of the cam member 50, the lock member 40 and the cam member 50 rotate counterclockwise due to the spring constants of the latch spring 73, the lock spring 74, and the cam spring 75. However, the latch member 30 is rotated counterclockwise via the cam surface 52 and the linkage projection 33, and the operating arm 44 of the lock member 40 is in contact with the latch-side arcuate surface 32 as shown in FIG. The striker 3 is held between the buffer portion 64 provided in the bottom portion of the holding groove portion 12 and the bowl-shaped groove portion 34 and is in a locked state.

  Here, when the striker 3 is to be pulled out from the holding groove portion 12 in the locked state, a force to rotate the latch member 30 in the clockwise direction is applied, and the cam member 50 is interposed via the linkage protrusion 33 and the cam surface 52. However, only a force in the axial center direction acts on the lock member 40 via the lock surface 42, and a force that causes the lock member 40 to rotate in the clockwise direction in FIG. Since the component force) hardly acts, the striker 3 is not pulled out and the locked state is maintained.

  Next, when the operating arm 44 in the locked state is rotated clockwise against the spring force from the locked state shown in FIG. 10, the operating force is applied via the lock-cam linkage 54 as shown in FIG. The cam member 50 is transmitted to the cam member 50 and rotates together with the lock member 40 in the clockwise direction. When the operation arm 44 is further rotated clockwise to disengage the linkage protrusion 33 from the cam surface 52, the latch member 30 is rotated clockwise by the urging force of the latch spring 73 as shown in FIG. It abuts on the lock surface 42. Then, when the operating arm 44 is further rotated in the clockwise direction and the lock surface 42 is removed from the turning locus of the latch member 30, the latch member 30 is rotated in the clockwise direction by the urging force of the latch spring 73 as shown in FIG. The latch part moves to the release position. Here, the rotation range of the lock member 40 in the unlocking direction is defined by the arm portion 46 of the lock member 40 coming into contact with the stopper portion 15.

  As described above, in the present embodiment, the restricting portions 22a, 22b, 71a, which define the axial positions of the latch member 30, the lock member 40, and the cam member 50 with respect to the support shafts 71, 72 between the base plate 10 and the holder plate 20. Since the latch spring 73, the cam spring 75, and the lock spring 74 are disposed on the outer periphery of the 71b, there is no need to newly provide a member for fixing the spring, so that the axial dimensions of the support shafts 71 and 72 are reduced. In addition, the lock member 40 and the cam member 50 can be supported in the axial direction while ensuring the operability of the spring.

  Since the latch member 30, the lock member 40, the cam member 50, the latch spring 73, the lock spring 74, and the cam spring 75, which are components of the lock device 1, can be arranged between the base plate 10 and the holder plate 20, the lock device 1 is unitized (locked) Unit 2) can be. Moreover, since the base plate 10 and the holder plate 20 can be made into the minimum shape required for ensuring strength, the entire apparatus can be reduced in size and weight.

  By using the inside of the press recess 26 formed on the back side of the lock restricting portions 22a and 22b of the holder plate 20 for caulking and fixing the holder plate 20 and the support shafts 71 and 72, the lock-side support shaft 72 is lengthened. In addition, since the two springs can be arranged side by side in the axial direction of the support shafts 71 and 72, the axial dimension of the support shafts 71 and 72 of the entire apparatus can be reduced.

  In order to prevent rattling when the latch member 30 is rotated, the cam spring 75 that is set stronger than the lock spring 74 is disposed on the large-diameter portion on the lock member 40 side that can secure a wide axial space. Thus, the axial space can be efficiently used, and the axial dimensions of the support shafts 71 and 72 of the entire apparatus can be further reduced.

  In the axial direction of the support shafts 71 and 72, the latch member 30 and the lock member 40 are arranged on the same plane, and the cam member 50 is attached to the lock member 40 so as to engage with a protrusion protruding from one surface of the latch member 30. Since the load is applied to each member in a well-balanced manner due to the overlapping arrangement, the lock strength can be improved.

  Since the spring hooks 14 a, 14 b, and 24 protrude from the inside of the lock unit 2, nothing protrudes outward from the side surfaces of the base plate 10 and the holder plate 20. Therefore, the mounting surface of the seat component may be a flat surface, and there is no need to provide a relief or the like.

  Since the stopper portion 13 protrudes from the inside of the lock unit 2, there is nothing that protrudes outward from the side surface of the base plate 10 or the holder plate 20. Therefore, the mounting surface of the seat component may be a flat surface, and there is no need to provide a relief or the like.

  Since the cover member 60 is provided separately from the lock unit 2 and is detachable, it can be applied to various seats only by changing the cover member 60 without changing the lock unit 2. Can be reduced. Further, since the cover member 60 can be assembled after the lock unit 2 is assembled, the assembling workability can be improved.

  Since the buffer part 64 extended from the cover member 60 made of a resin material is disposed between the base plate 10 and the striker 3, it is possible to prevent the generation of abnormal noise without providing a separate damper. .

DESCRIPTION OF SYMBOLS 1 ... Locking device 2 ... Lock unit 3 ... Striker 10 ... Base plate 13 ... Stopper part 14a, 14b, 24 ... Spring hook part 20 ... Holder plate 22b ... Holder side lock control part 30 ... Latch member 33 ... Coupling protrusion 34 ... Spear shape Groove 40 ... Lock member 42 ... Lock surface 50 ... Cam member 52 ... Cam surface (circumferential surface)
DESCRIPTION OF SYMBOLS 60 ... Cover member 64 ... Buffer part 71 ... Latch side support shaft 72 ... Lock side support shaft 73 ... Latch spring 74 ... Lock spring 75 ... Cam spring

Claims (7)

A latch-side support shaft having one end fixed to the base plate and the other end fixed to the holder plate;
A lock-side support shaft having one end fixed to the base plate and the other end fixed to the holder plate;
A latch rotatably disposed on the latch-side support shaft between the base plate and the holder plate;
A cam member rotatably disposed on the lock side support shaft between the base plate and the holder plate, and a lock member;
A latch spring that biases the latch toward the open position;
A lock spring that biases the lock member in a direction of engagement with the latch;
A lock device comprising a lock unit comprising a cam spring for urging the cam member in an engagement direction with the latch;
In order to determine the axial position of the latch with respect to the latch-side support shaft, a step portion provided on one end side of the latch-side support shaft and having a larger diameter than a portion through which the latch of the latch-side support shaft is inserted. A base side latch restricting portion comprising:
Projected toward the base plate side at a portion provided on the other end side of the latch side support shaft and connecting the other end of the latch side support shaft of the holder plate, and the latch of the latch side support shaft is inserted. A holder-side latch restricting portion having a step portion set to have a diameter larger than that of the portion, and the lock-side support for determining the cam member relative to the lock-side support shaft and the axial position of the lock member A base-side lock restricting portion that is provided on one end side of the shaft, and includes a cam portion of the lock-side support shaft, and a step portion set to have a larger diameter than a portion through which the lock member is inserted;
Provided on the other end side of the lock-side support shaft, protrudes toward the base plate side at a portion connecting the other end of the lock-side support shaft of the holder plate, and the cam member of the lock-side support shaft, And a holder side lock restricting portion comprising a step portion set to have a larger diameter than a portion through which the lock member is inserted,
The latch spring is wound around the outer periphery of the base side latch restricting portion or the outer periphery of the holder side latch restricting portion,
One of the lock spring and the cam spring is wound around the outer periphery of the base-side lock restricting portion, and the other of the lock spring and the cam spring is wound around the outer periphery of the holder-side lock restricting portion. Locking device to do. The locking device according to claim 1, wherein
The holder-side lock restricting portion and the holder-side latch restricting portion provided on the holder plate side are pressed around the coupling portion of the holder plate with the lock-side support shaft and the latch-side support shaft. Consists of a large-diameter part that protrudes toward the base plate.
A lock device characterized in that the lock-side support shaft and the end of the latch-side support shaft, which penetrate the holder plate, are caulked and fixed within a recess on the back surface side of the large-diameter portion. The locking device according to claim 1 or 2,
A linking projection protrudes from one side of the latch,
The latch and the lock member are arranged on the same plane,
The cam member is overlapped on the lock member so that a peripheral surface thereof is engageable with the linkage protrusion,
The cam spring whose operating side end is locked to the cam member while the lock spring whose operating side end is locked to the lock member is wound around the outer periphery of the lock regulating portion on the side adjacent to the cam member A lock device, wherein the lock member is wound around an outer periphery of a lock restricting portion on an adjacent side. In the locking device according to any one of claims 1 to 3,
At least one of the base plate and the holder plate is provided with a spring hook that protrudes toward the other side,
The locking device is characterized in that fixed side ends of the latch spring, the lock spring, and the cam spring are respectively engaged with the spring hooks. The locking device according to any one of claims 1 to 4,
At least one of the base plate and the holder plate is provided with a stopper portion protruding toward the other side,
At least one of the latch, the lock member, and the cam member is engaged with the stopper portion at a rotation end to define a rotation range. The locking device according to any one of claims 1 to 5,
A locking device comprising a cover member having a substantially box shape with one surface open and in which the lock unit is detachably housed. The locking device according to claim 6, wherein
The cover member is formed of a resin material,
The latch member includes a hook-like groove portion formed so that a shaft-like striker disposed outside can be engaged and disengaged,
A locking device characterized in that a buffer portion extending from the cover member is disposed between the base plate and the striker inserted in the groove portion of the latch member located at the lock position.

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