JP2012036565A - Lock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it difficult to reduce torque for driving a hook even when energizing force of a spring is weakened by the progress of the rotation of a driving plate.SOLUTION: A hook 20 is pressed and rotated by the movement of a striker S entering a recessed part 11 of a base plate 10, and is turned to the state of holding the striker S with the recessed part 11. A pole 30 regulates the return rotation of the hook 20 by being engaged with the hook 20. A driving plate 40 pressurizes a part 26 to be pressurized of the hook 20 by the rotation receiving the energizing force of a spiral spring 80, and rotates the hook 20 in the direction of narrowing a gap with the recessed part 11. The part 26 to be pressurized is formed in such a shape that an abutting surface 26A to be pressurized by the pressurizing surface 42 of the driving plate 40 is protrusively swollen, and is disposed so as to increase a moment distance L from a rotation center 20R of the hook 20 of the action point (contact point P) of pressurizing force applied to the abutting surface 26A accompanying the movement of being pressed and rotated by the driving plate 40.

Description

  The present invention relates to a locking device. Specifically, the present invention relates to a locking device that is provided on one of two members that are locked to each other and that receives and locks a striker provided on the other member.

  Conventionally, what was indicated by the following patent documents 1 is known as a locking device which locks a vehicular seat to a striker installed on the floor. The locking device includes a base plate, a hook, a pole, and a driving plate. The base plate is provided so as to be fixed to the vehicle seat and has a recess that can receive the striker. The hook is pushed and rotated by an operation in which the striker is received in the recess of the base plate, and the recess is closed with a part of the shape being turned around the back of the striker. When the hook is in a state in which the recess is closed, the pole engages with the hook by the rotation received by the urging force of the spring, and keeps the hook from rotating. The driving plate rotates together with the pole as the pole engages with the hook, and pushes the hook in a direction to further rotate, thereby suppressing the backlash movement of the striker sandwiched between the hook and the recess.

International Publication No. 2006/095517

  However, in the prior art disclosed above, the spring that applies the rotational biasing force to the driving plate weakens the biasing force with the progress of the rotation of the driving plate, so that when the amount of rotation driving the hook increases due to the small diameter of the striker, In some cases, it will not be possible to drive in enough. The present invention was devised as a solution to the above-described problem, and the problem to be solved by the present invention is that the locking device can be used even when the urging force of the spring is weakened by the progress of the rotation of the driving plate. This is to make it difficult to reduce the torque for driving.

  First, the first invention is a locking device that is provided on one of two members locked to each other and receives and locks a striker provided on the other, and includes a base plate, a hook, a pole, a driving plate, Have. The base plate has a recess capable of receiving a striker. The hook is pivotally supported by the base plate, is rotated by the movement of the striker entering the recess, and is in a state of sandwiching the striker with the recess. The pole is rotatably supported by the base plate, and when the hook is in a state of holding the striker, it engages with the hook and restricts the return rotation of the hook. The drive-in plate is pivotally supported by the base plate and presses the hook whose return rotation is restricted by the pole by the rotation that receives the urging force of the spring, in a direction to close the gap between the hook and the recess. Rotate. The hook is formed with a pressed portion that receives a pressing force in the rotational direction from a pressing surface formed on the driving plate. The pressed portion is formed in a shape in which the contact surface pressed by the pressing surface swells in a convex shape, and the pressed portion applied to the contact surface as the pressed portion is pushed by the driving plate and rotates. The pressed portion is arranged so that the moment distance from the rotation center of the hook at the point of application of pressure increases.

  According to the first aspect of the present invention, the contact surface of the hook is formed so as to bulge in a convex shape, so that the rotation of the driving plate is compared with the case where the contact surface is formed in a concave shape or a flat shape. The rate of position variation in which the point of action of the pressing force applied to the contact surface with the progress changes toward the center of rotation of the hook can be kept small. Further, the pressed portion is arranged so that the moment distance from the rotation center of the hook of the point of action of the pressing force applied to the contact surface increases as the pressed portion is pushed by the driving plate and rotates. As a result, even if the urging force of the spring is weakened with the progress of the rotation of the driving plate, it is difficult to reduce the torque for driving the hook.

  Next, according to a second aspect of the present invention, in the first aspect described above, the first straight line that is parallel to the traveling direction in which the striker enters the recess and passes through the rotation center of the hook, and that is perpendicular to the first straight line and that is hooked In the quadrant of the four quadrants defined by the second straight line passing through the rotation center of the first hook, the hook is pushed by the striker and rotated to sandwich the striker with the recess. Is set. Further, in the other quadrants adjacent to each other in the direction in which the hook is pushed from the one quadrant, a rotation center of the driving plate and a region portion in which the contact surface is pressed in the rotation direction of the hook by the driving plate are set. ing.

  According to the second aspect of the invention, the hook is configured to be pressed in the rotation direction by the driving plate whose rotation center is set in the same quadrant as the contact surface is pushed around. As the part is pushed by the driving plate and rotates, the action point of the pressing force applied to the contact surface moves in the rotation region where the movement amount in the direction of increasing the moment distance from the rotation center of the hook is large. Therefore, even if the urging force of the spring is weakened with the progress of the rotation of the driving plate, it is possible to further reduce the torque for driving the hook. In addition, the quadrant where the rotation center of the driving plate is set and the quadrant where the hook is pushed around the striker and sandwiching the striker are arranged adjacent to each other without overlapping, so that the rotation of the driving plate Even if the amount is large, it is possible to make it difficult for the driving plate to interfere with the striker received in the recess of the base plate.

  Next, according to a third aspect, in the first or second aspect described above, the pressed portion has a tapered shape as a whole toward a contact surface that bulges in a convex shape in contact with the pressing surface. It is formed in a triangular shape, and the contact surface bulging in a convex shape is formed in a shape rounded into an arc shape.

  According to the third aspect of the present invention, the pressed portion is formed in a triangular shape that tapers toward the tip-side contact surface, so that the tip-side contact surface is narrowed to have an arc shape. By reducing the curvature that is rounded to a smaller angle, the rate of change in position at which the point of action of the pressing force on the contact surface shifts toward the center of rotation of the hook as the rotational movement of the drive-in plate decreases In addition, the structural strength of the pressed portion can be secured by the shape portion that becomes thicker toward the side opposite to the tip side.

It is a side view of the vehicle seat to which the locking device of Example 1 was applied. It is a disassembled perspective view of a locking device. It is a releasing state figure of a locking device. It is a lock state figure of a locking device. It is the lock state figure which showed the state which pushed the locking device with respect to the striker with a small diameter, and was made to lock it. Furthermore, it is the lock state figure which showed the state which forced the lock device into the striker with a small diameter and locked it. It is a schematic diagram which shows the change of the moment distance accompanying rotation of a drive-in plate. It is a figure which shows the arrangement | positioning relationship of a hook and a drive-in plate.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

  First, the configuration of the locking device 5 according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the lock device 5 of the present embodiment is provided in the vehicle seat 1 and has an operation structure that can be locked or released with respect to the striker S installed on the floor F. I have. Here, the vehicle seat 1 includes a seat back 2 serving as a backrest and a seat cushion 3 serving as a seating portion, and both left and right side portions on the front end side of the seat cushion 3 are installed on the floor F. The support base 4 is hinged to be rotatable.

  And the locking device 5 mentioned above is provided in the right-and-left both side part of the rear end side of the seat cushion 3, By always locking these locking devices 5 to the striker S installed on the floor F, The seat cushion 3 is held in a lying posture on the floor F. The locked state of the lock device 5 with respect to the striker S is released by operating a release lever (not shown) provided in the vehicle seat 1.

  The vehicle seat 1 is released from the fixed state of the backrest angle of the seat back 2 by operating the release lever (not shown) from the seatable posture in which the seat back 2 stands upright. The seat back 2 is folded on the upper surface of the seat cushion 3 by an urging force of an urging spring (not shown), and the locked state of each locking device 5 is released and the engaged state with the floor F is released. With this release operation, the vehicle seat 1 is centered on the connection point 4A with the support base 4 by the urging force of an urging spring (not shown) provided at the connection part with the support base 4. The vehicle is flipped up to the front Fr side and stored. Then, the vehicle seat 1 is operated so that the vehicle seat 1 is pushed down toward the vehicle rear Re side from the stored state, and the lock devices 5 are operated to be pushed into the strikers S. 5 locks with each striker S, and the vehicle seat 1 is returned to a state where it is held in a lying position on the floor F.

  Hereinafter, the configuration of each locking device 5 will be described in detail. These locking devices 5 are arranged in a pair of left and right in the direction shown in FIG. 1 with respect to the vehicle seat 1 and are assembled in a symmetrical manner. The locking device 5 shown in FIG. 1 shows the internal structure of the locking device 5 arranged on the front side when the vehicle seat 1 is viewed from the side, as seen from the outside of the vehicle. In order to show the internal structure of the lock device 5 in an easy-to-understand manner, the lock device 5 is shown as seen from the inside of the vehicle.

  As shown in FIGS. 1 to 3, the lock device 5 includes a base plate 10, a hook 20, a pole 30, an operation plate 50, a cable 60, a tension spring 70, and a spiral spring 80. Here, the spiral spring 80 corresponds to the spring of the present invention. The base plate 10 has a recess 11 that can receive the striker S, and the hook 20 is rotatably supported on the base plate 10 by a second support shaft 20A, and includes a pole 30, a driving plate 40, and an operation plate. Each of the shafts 50 is rotatably supported on the base plate 10 by the first support shaft 30A. The cable 60 connects the operation plate 50 and the release lever (not shown) described above, and transmits the operation movement amount of the release lever to the operation plate 50 to rotate the operation plate 50. The tension spring 70 is hooked between the operation plate 50 integrally coupled to the pole 30 and the upper jaw member 21 of the hook 20, and applies an urging force in a direction in which these hooking portions are pulled toward each other. The spiral spring 80 is hooked between the first support shaft 30 </ b> A fixed to the base plate 10 and the drive plate 40 that can rotate with respect to the first support shaft 30 </ b> A, and the drive plate 40 is attached to the base plate 10. Apply an urging force to rotate in one direction.

  Here, first, the basic configuration of each component will be described. As shown in FIG. 3, the hook 20 is normally in an initial position where the upper jaw portion 21 </ b> B projects into the recess 11 of the base plate 10 by the urging force of the tension spring 70 that is hooked between the hook 20 and the operation plate 50. It is held in the state (released state). As the striker S is pushed into the recess 11 of the base plate 10, the hook 20 rotates so that the upper jaw portion 21 </ b> B is pushed from below by the striker S, and the lower jaw portion 22 of the striker S is moved. It turns into the back side (illustration lower side), and will be in the state which closed the recessed part 11 (refer FIG. 4). And when this lower jaw part 22 will be in the state which closed the recessed part 11, the pole 30 will be engaged with the hook 20 with the urging | biasing force of the tension | pulling spring 70, and it will be in the state (locking state) which controlled the return rotation of the hook 20. FIG. As a result, the striker S is constrained by the lower jaw portion 22 so as not to be detached from the recess 11.

  As shown in FIGS. 2 to 3, the pole 30 is integrally coupled to the operation plate 50 in the rotation direction, and the hook 20 is in an initial position in which the upper jaw portion 21 </ b> B projects into the recess 11. The lower surface of the corner portion 31 is pressed against the corner portion 25 of the hook 20 by the biasing force of the tension spring 70 that is hooked between the hook 20 and the operation plate 50. Is held. As shown in FIG. 4, the pole 30 is in a state where the hook 20 is pushed by the striker S and the lower jaw portion 22 is turned to the rear side of the striker S to close the recess 11. The corner portion 25 of the pole 30 is removed from contact with the lower surface of the corner portion 31 of the pole 30, and the corner portion 31 of the pole 30 rotates so as to fall below the step of the corner portion 25 of the hook 20 by the biasing force of the tension spring 70. Thus, the return rotation of the hook 20 in the clockwise direction shown in the figure is restricted. As a result, the striker S is held by the rotation-restricted hook 20 so as not to be detached from the recess 11 (locked state).

  As shown in FIGS. 2 to 3, the drive-in plate 40 is pivotally supported by the first support shaft 30 </ b> A so as to be rotatable about the same axis as the pole 30, and is normally fixed to the base plate 10. It is in a state of being urged to rotate counterclockwise as shown in FIG. 3 by the urging force of the spiral spring 80 hooked between the support shaft 30A. That is, the drive-in plate 40 is urged by the urging force of the spiral spring 80 in the same rotational direction as the direction in which the pole 30 is rotationally urged by the urging force of the tension spring 70. The driving plate 40 is in a state in which a pin 32 protruding from the pole 30 is inserted into a through hole 41 penetrating in the plate thickness direction. As shown in FIG. When the corner portion 31 of the pole 30 protrudes into the upper surface of the corner portion 25 of the hook 20 and is in the initial position, the peripheral portion of the through hole 41 is attached to the pin 32 at a position where it contacts the pin 32. The rotation by the force is held in a regulated state.

  3 to 4, the striker S enters the recess 11 to push the hook 20 around, and the hook 20 pushes the striker S between the lower jaw portion 22 and the recess 11 of the base plate 10. And the pole 30 rotates with the rotation of dropping the corner portion 31 under the step of the corner portion 25 of the hook 20, and the pressed portion 26 of the hook 20 is moved by the pressing surface 42 on the outer peripheral side. By pressing, the hook 20 is further pushed in the direction in which the rotation further proceeds (counterclockwise direction in the drawing). As a result, the hook 20 is pushed in the direction of further rotation from the position where the hook 20 is engaged with the corner portion 31 of the pole 30 and its return rotation is restricted, and the lower jaw 22 and the recess 11 And the striker S is pressed so as not to rattle within the gap. As a result, it is possible to prevent the striker S from rattling within the gap due to vibration generated when the vehicle travels and hitting the hook 20 or the base plate 10 to generate a striking sound or vibration.

  By the way, as shown in FIGS. 4 to 6, the rotational movement amount for pushing the hook 20 further in the direction of further rotation by the pushing plate 40 increases as the diameter of the applied striker S becomes smaller. Here, the striker S2 shown in FIG. 5 has a smaller diameter than the striker S1 shown in FIG. 4, and the striker S3 shown in FIG. 6 has a smaller diameter than the striker S2 shown in FIG. . Thus, as the diameter of the striker S decreases, the rotational movement amount of the hook 20 increases, and at the same time, the rotational movement amount of the driving plate 40 that drives the hook 20 further in the rotational direction also increases. . Therefore, as the amount of rotational movement of the driving plate 40 increases, the spiral spring 80 that rotationally biases the driving plate 40 loosens and the rotational biasing force weakens, so that the torque for driving the hook 20 weakens and sufficient driving is performed. There is a risk that it will not be possible.

  However, in the locking device 5 of the present embodiment, as shown in FIGS. 4 to 6, the pressing surface 42 of the driving plate 40 is brought into contact with the pressed portion 26 of the hook 20 as the driving plate 40 rotates. The moment distance L (L1, L2, L3) from the rotation center 20R of the hook 20 at the point of application (contact point P) at which the pressing force is applied to 26A increases. Thereby, even if the urging force of the spiral spring 80 is weakened with the progress of the rotation of the driving plate 40, the torque for driving the hook 20 is hardly reduced.

  Hereinafter, the structure of each part of the locking device 5 will be described in detail. First, returning to FIG. 2, the configuration of the base plate 10 will be described. The base plate 10 has a set of two sheets each composed of a first base plate 10A and a second base plate 10B made of a steel plate, and is integrally coupled to the skeleton of the seat cushion 3. Yes. Each component such as the hook 20, the pole 30, the drive-in plate 40, and the operation plate 50 constituting the locking device 5 is assembled between the first base plate 10 </ b> A and the second base plate 10 </ b> B. The first base plate 10A and the second base plate 10B are each formed with a recess 11 that can receive the striker S so as to open downward in the figure. These recesses 11 are formed in a shape in which the shape expands in an inclined manner toward the opening on the lower side in the figure, and the recesses 11 of the second base plate 10B are made of resin so as to cover the inner peripheral surface thereof. A cover 13 is assembled. The cover 13 functions as a cushioning material that softens the strike when the striker S (see FIG. 3) enters the recess 11.

  The hook 20 is separately provided with an upper jaw member 21 in which an upper jaw portion 21B extending in an arm shape is formed, and these are stacked on each other in the plate thickness direction (axial direction) by a second support shaft 20A. The plate 10 is connected in a rotatable state. Specifically, the hook 20 and the upper jaw member 21 are connected to the second support shaft 20 </ b> A so as to be rotatable, and the second support shaft 20 </ b> A is integrally welded to the base plate 10. Has been fixed. The hook 20 and the upper jaw member 21 have a configuration in which a pin 24 that protrudes from the hook 20 in the plate thickness direction is fitted in a loose fitting hole 21 </ b> A that is formed through the upper jaw member 21. They are in a state where they can rotate together. Specifically, the loose fitting hole 21A is formed in a shape that is slightly larger than the pin 24, and as shown in FIGS. 3 to 4, the upper jaw member 21 rotates with respect to the hook 20 and the loose fitting hole 21A. Since the inner peripheral surface of each of them is in contact with the pin 24, the two are in a state of being integrated with each other in the contacting rotation direction.

  The hook 20 is normally shown in FIG. 3 by the urging force of a tension spring 70 hooked between a hook portion 21C formed on the upper jaw member 21 and a hook portion 52 of an operation plate 50 described later. Thus, the engagement surface 25A, which is biased to rotate in the clockwise direction and faces the rotation direction of the corner portion 25 that protrudes from the outer peripheral portion on the upper side in the figure, is recessed in the outer peripheral portion of the pole 30. It is held in a state of abutting against the stopper surface 31B formed in a shape. In this state, the hook 20 is in a state where the upper jaw portion 21B of the upper jaw member 21 is projected into the recess 11 of the base plate 10 so as to form a receiving port 23 between the upper jaw portion 21B. The lower jaw portion 22 formed with a gap is held in a state of being retracted to the outside of the recess 11. The upper jaw portion 21 </ b> B projecting into the recess 11 is covered with a resin cover 21 </ b> D that functions to reduce the contact with the striker S.

  In the hook 20, the upper jaw portion 21 </ b> B projecting into the concave portion 11 is moved upward in the drawing by the striker S as the striker S relatively enters the concave portion 11 of the base plate 10 toward the upper side in the drawing. To rotate counterclockwise in the figure. As a result, the hook 20 rotates while sliding the corner portion 25 along the lower surface of the corner portion 31 of the pole 30, and turns the lower jaw portion 22 toward the rear side of the striker S to close the recess 11. It will be in the state. The corners 25 of the hooks 20 are removed from the lower surfaces of the corners 31 of the poles 30 by the above-described rotation, so that the corners 31 of the poles 30 It falls below the level difference, and the engagement surface 25A of the corner 25 and the engagement surface 31A of the corner 31 of the pole 30 face each other in the rotational direction, and the tension spring 70 is attached by the corner 31 of the pole 30. The rotation in the clockwise direction shown in the figure by the force is restricted (locked state) (see FIG. 4). Accordingly, the striker S is sandwiched between the lower jaw portion 22 of the hook 20 and the upper surface 11A of the recess 11 and is held so as not to be detached from the recess 11.

  When the striker S is sandwiched between the lower jaw portion 22 and the recess 11 of the hook 20 and locked, the cable 60 connected to the operation plate 50 integrally connected to the pole 30 is released as described above (not shown). The pole 30 is pulled by the operation of the lever, and released by rotating the pole 30 in the clockwise direction in the drawing. Specifically, when the pole 30 is rotated in the clockwise direction in the drawing, the corner portion 31 of the pole 30 is removed from the state where it is abutted against the corner portion 25 of the hook 20, and the rotation restriction state of the hook 20 is reached. Is released. As a result, the hook 20 rotates in the clockwise direction in the figure by the urging force of the tension spring 70, and pushes the striker S to the lower side in the figure by the upper jaw part 21 </ b> B to follow the outer side of the recess 11. Remove from the combined state (see FIG. 3).

  As shown in FIG. 2, the pole 30 and the operation plate 50 are provided side by side in the axial direction and assembled to the base plate 10 by the first support shaft 30A in an assembled state in the rotation direction. And connected in a rotatable state. Specifically, the pole 30 and the operation plate 50 are configured such that a pin 33 formed so as to protrude from the pole 30 in the plate thickness direction (axial direction) is fitted in a fitting hole 51 formed through the operation plate 50. As a result, they are integrally assembled in the rotational direction. The pole 30 and the operation plate 50 are connected to the first support shaft 30A so as to be rotatable, and the first support shaft 30A is integrally welded to the base plate 10. Is fixed.

  As shown in FIG. 3, the pole 30 is normally moved by the urging force of the tension spring 70 that is hooked between the hook portion 52 of the operation plate 50 and the hook portion 21 </ b> C of the upper jaw member 21 of the hook 20. It is urged to rotate counterclockwise in the drawing, and the lower surface of the corner portion 31 protruding from the outer peripheral portion on the upper left side of the drawing is pressed against the upper surface of the corner portion 25 formed in the outer peripheral portion of the hook 20. It is held in the state. When the striker S is pushed by the movement of the striker S into the recess 11 of the base plate 10 and the hook 20 is rotated, the corner 25 of the hook 20 is disengaged from the lower surface of the corner 31. By the urging force, the corner portion 31 is rotated so as to drop below the step of the corner portion 25 of the hook 20, and the return rotation of the hook 20 is restricted (lock state).

  When the corner 31 of the pole 30 falls below the step of the corner 25 of the hook 20 and the return rotation of the hook 20 is restricted, the cable 60 connected to the operation plate 50 connected integrally with the pole 30 is pulled. It is canceled by doing. The end portion of the cable 60 is slidable in a long hole 53 formed in the operation plate 50, and the end portion of the guide tube that guides the routing route is connected to the base plate 10 ( It is hooked and fixed to a hooking portion 12 (see FIG. 2) formed on the second base plate 10B).

  As shown in FIG. 2, the driving plate 40 is coupled to the base plate 10 by the first support shaft 30 </ b> A together with the pole 30 and the operation plate 50. The driving plate 40 has a spiral spring 80 between a hanging portion 43 formed on an arm portion extending toward the right side of the drawing and the first support shaft 30A fixed to the base plate 10. And is normally urged to rotate counterclockwise by the urging force of the spiral spring 80. The driving plate 40 is formed with a through hole 41 penetrating in the thickness direction (axial direction) in an arm portion extending toward the left side of the figure, and the plate 30 extends from the pole 30 into the through hole 41. A pin 32 that protrudes in the thickness direction is inserted. As a result, as shown in FIG. 3, the driving plate 40 is normally in a state of being urged to rotate counterclockwise by the urging force of the spiral spring 80, and the pin 32 is placed on the upper surface of the through hole 41. It is in a state of being locked at the abutting rotational position.

  When the striker S is pushed by the movement of the striker S entering the recess 11 of the base plate 10, the hook 20 is rotated, and the pole 30 is rotated so that the corner portion 31 drops below the step of the corner portion 25 of the hook 20. Along with this, the locked state of the rotation by the pole 30 is released and the counterclockwise rotation shown in the figure is performed by the urging force of the spiral spring 80. With this rotation, as shown in FIG. 4, the driving plate 40 is formed by projecting the outer peripheral surface (pressing surface 42) of the arm portion in which the through hole 41 is formed in the hook 20 in the plate thickness direction. The contacted portion 26A of the pressed portion 26 is brought into contact with the contact surface 26A, and as the rotation proceeds, the pressed portion 26 is pressed and the hook 20 is further rotated in the direction of further rotation.

  Here, the pressing surface 42 of the driving plate 40 is not in the form of an arc around the rotation center (first support shaft 30A) of the driving plate 40, but as the rotation proceeds, the pressed portion 26 of the hook 20 is not formed. Is formed into a curved surface shape having a driving angle that gradually pushes out to the far side. As a result, the driving plate 40 pushes the hook 20 in the direction in which the rotation further proceeds from the position where the rotation is restricted by the pole 30 and the rotation is restricted by the progress of the rotation under the urging force of the spiral spring 80. Turn to close the gap between the lower jaw portion 22 of the hook 20 and the upper surface 11A of the recess 11, and hold the striker S so that it does not rattle within the gap.

  By the way, as shown in FIGS. 4 to 6, the rotational movement amount that drives the hook 20 in the direction of further rotation by the driving plate 40 increases as the diameter of the applied striker S decreases. At the time of this driving, as shown in FIG. 7, the position of the contact point P on the side of the contact surface 26 </ b> A where the contact surface 26 </ b> A of the pressed portion 26 is pressed by the pressing surface 42 is as the rotation of the driving plate 40 proceeds. As the hook 20 is pushed around and the direction of the pressed portion 26 changes in the rotation direction of the hook 20, it gradually changes toward the lower side of the figure (the rotation center 20 </ b> R side). ing. However, the positional fluctuation of the contact point P on the contact surface 26A side downward is formed such that the contact surface 26A bulges toward the pressing surface 42 so that the contact surface 26A and the pressing surface 26 42, the contact point P where the pressing surface 42 comes into contact with the contact surface 26A is likely to concentrate in the vicinity of the convex portion on the tip side of the contact surface 26A. Therefore, the ratio of the positional fluctuation is suppressed to be smaller than that in which the contact surface 26A is formed in a concave shape or a planar shape. As described above, the position variation of the pressing force acting point (contact point P) applied to the contact surface 26A to the lower side in the figure is suppressed to be small, so that the moment distance L from the rotation center 20R of the hook 20 (the moment in FIG. 7). Since the decrease rate of the distances L1, L2, and L3) is also suppressed to a small value, the decrease rate of the driving torque accompanying the progress of the rotation of the driving plate 40 is suppressed to a small value.

  Specifically, in the pressed portion 26, the movement region that is rotated by being pressed by the pressing surface 42 of the driving plate 40 moves upward in the drawing from the rotation center 20 </ b> R of the hook 20 as the rotation proceeds. The amount is set so as to pass through a relatively large rotation region, and the moment distance from the rotation center 20R of the hook 20 at the point of application of the pressing force (contact point P) applied to the contact surface 26A as the rotation proceeds. L gradually increases. Specifically, as shown in FIG. 8, the hook 20 is divided into four quadrants (first quadrant A1 to fourth quadrant A4) with the center of rotation 20R as the origin, and the lower right side in the figure. Within the four quadrants A4, there are set regions where the upper jaw portion 21B and the lower jaw portion 22 are formed which are pushed and rotated by the striker S and sandwich the striker S with the recess 11. Further, in the first quadrant A1 on the upper right side of the figure adjacent to the direction in which the hook 20 is pushed from the fourth quadrant A4, the rotation center (first support shaft 30A) of the drive plate 40 and the drive plate 40 cover the cover. A region portion where the pressing portion 26 is pressed in the rotation direction of the hook 20 is set. The four quadrants (first quadrant A1 to fourth quadrant A4) include a first straight line B1 that is parallel to the traveling direction In in which the striker S enters the recess 11 and passes through the rotation center 20R of the hook 20, and the first straight line B1. A second straight line B2 that is perpendicular to the straight line B1 and passes through the rotation center 20R of the hook 20 is defined.

  In this way, the hook 20 is rotated in the rotation direction by the driving plate 40 in which the rotation center (first support shaft 30A) is set in the same quadrant as the quadrant (first quadrant A1) in which the pressed portion 26 is pushed. By being configured to be pressed, the action point (contact point P) of the pressing force applied to the contact surface 26 </ b> A as the pressed portion 26 is pushed by the driving plate 40 and rotates moves the hook 20. The moment distance L from the rotation center 20R (moment distances L1, L2, L3 in FIG. 7) is greatly moved in the increasing direction. Therefore, even if the urging force of the spiral spring 80 is weakened with the progress of the rotation of the driving plate 40, it is possible to make it difficult to reduce the torque for driving the hook 20. In addition, there is a quadrant (first quadrant A1) in which the rotation center (first support shaft 30A) of the driving plate 40 is set, and an area portion in which the hook 20 is pushed by the striker S and the striker S is sandwiched. Since the set quadrant (fourth quadrant A4) is adjacent to the quadrant A4, the drive plate 40 can be received in the recess 11 of the base plate 10 even if the rotation amount of the drive plate 40 is large. It can be made difficult to interfere with the striker S.

  Here, as a configuration for suppressing the position fluctuation of the pressing force acting point (contact point P) applied to the contact surface 26A of the pressed portion 26 to the lower side in the figure, the driving angle of the pressing surface 42 of the driving plate 40 is reduced. It is conceivable that the contact surface P is not lowered so that the pressing surface 42 is always in contact with the region on the upper side of the contact surface 26A of the pressed portion 26 in the figure. If it is too tight, the moment distance L from the rotation center 20R of the hook 20 at the point of application of the pressing force (contact point P) becomes small, and the torque for driving the hook 20 becomes small. Therefore, it is preferable that the driving angle of the pressing surface 42 is formed so as to be a gentle driving angle close to the shape of an arc around the rotation center (first support shaft 30A) of the driving plate 40.

  When the release lever (not shown) is operated and the pole 30 is rotated in the counterclockwise direction in the drawing, the upper surface of the through hole 41 is moved upward in the drawing plate 40 by the pin 32 of the pole 30. And is released from the engaged state with the pressed portion 26 of the hook 20. Thereby, the rotation restriction state by the pole 30 of the hook 20 is released, and the driving state by the driving plate 40 is released (see FIG. 3).

  By the way, the pressed portion 26 of the hook 20 described above is formed in a triangular shape in which the entire shape is tapered toward the contact surface 26A swelled in a convex shape that comes into contact with the pressing surface 42. The contact surface 26A swelled is formed in a shape rounded into an arc. As a result, the contact surface 26A on the distal end side of the pressed portion 26 is narrowed to reduce the curvature that is rounded into the arc shape, and the point of action of the pressing force applied to the contact surface 26A is the rotational movement of the driving plate 40. The portion of the hook 20 that moves toward the center of rotation 20R can be reduced in rate, and the shape of the portion to be pressed becomes thicker toward the side opposite to the tip side. 26 structural strengths can be secured.

  Thus, according to the locking device 5 of the present embodiment, when the contact surface 26A of the hook 20 is formed in a convex shape, the contact surface 26A is formed in a concave shape or a planar shape. As compared with the above, the ratio of the position variation in which the action point of the pressing force applied to the contact surface 26A shifts toward the rotation center 20R of the hook 20 with the progress of the rotation of the drive plate 40 is suppressed. Further, as the contact surface 26A is pushed and rotated by the driving plate 40, the moment distance L from the rotation center 20R of the hook 20 at the point of action of the pressing force applied to the contact surface 26A increases. By setting the rotation region of the pressing portion 26, even if the urging force of the spiral spring 80 is weakened with the progress of the rotation of the driving plate 40, it is possible to make it difficult to reduce the torque for driving the hook 20.

  As mentioned above, although the embodiment of the present invention has been described using one example, the present invention can be implemented in various forms in addition to the above example. For example, in the above-described embodiment, the locking device according to the present invention is exemplified as a means for locking the vehicle seat 1 on the floor F. However, the locking device according to the present invention has two locking devices. Any member may be used as long as it is used as a locking device that is provided on one of the members and receives and locks the striker provided on the other, and the usage is not particularly limited. For example, the lock device may be provided on the floor and the striker may be provided on the vehicle seat.

  Moreover, in the said Example, although the spiral spring 80 was illustrated as what is corresponded to the spring of this invention which applies a rotational urging | biasing force to a drive-in plate, you may apply other spring members, such as a tension spring. Further, the pressed portion pressed in the rotation direction by the pressing surface of the driving plate does not have to be in a triangular shape as shown in the above embodiment, but is formed in a cylindrical shape. It may be. However, in this case, for example, in order to suppress the amount of downward displacement of the point of application of the pressing force applied to the contact surface of the pressed portion, the pressed portion is formed into a small circular shape with a small curvature of the contact surface. If formed, the shape of the entire pressed portion may be reduced, and the structural strength may not be sufficiently secured. In addition, if the circular shape is increased in order to increase the structural strength of the pressed part, the curvature of the contact surface also increases, and therefore, below the point of action of the pressing force applied to the contact surface compared to the case where the curvature is small. It should be noted that the amount of shift to the side becomes large.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back 3 Seat cushion 4 Support stand 4A Connection point 5 Locking device 10 Base plate 10A First base plate 10B Second base plate 11 Recess 11A Upper surface 12 Hanging portion 13 Cover 20 Hook 20A Second support shaft 20R Rotation center 21 Upper jaw member 21A Free fitting hole 21B Upper jaw portion 21C Hang portion 21D Cover 22 Lower jaw portion 23 Receptor 24 Pin 25 Corner portion 25A Engagement surface 26 Pressed portion 26A Contact surface 30 Pole 30A First support shaft 31 Corner portion 31A Engagement surface 31B Stopper surface 32 Pin 33 Pin 40 Drive-in plate 41 Through hole 42 Press surface 43 Hook portion 50 Operation plate 51 Fitting hole 52 Hook portion 53 Long hole 60 Cable 70 Tension spring 80 Spiral spring (spring)
F Floor S, S1, S2, S3 Striker L, L1, L2, L3 Moment distance P Contact point A1 First quadrant A2 Second quadrant A3 Third quadrant A4 Fourth quadrant Fr Vehicle front Re Vehicle rear In Travel direction B1 First Straight line B2 second straight line

Claims (3)

A locking device that is provided on one of two members that are locked to each other and that receives and locks a striker provided on the other,
A base plate having a recess capable of receiving the striker;
A hook that is pivotally supported by the base plate and is rotated by being pushed by the movement of the striker entering the recess, and is in a state of sandwiching the striker with the recess;
A pole that is pivotally supported by the base plate and that engages with the hook by restricting the return rotation of the hook by pinching the striker;
The hook, which is pivotally supported by the base plate and whose return rotation is restricted by the pole, is pressed by the rotation that receives the urging force of the spring, and the hook is in a direction to close the gap between the recess. A driving plate for rotation, and
The hook is formed with a pressed portion that receives a pressing force in the rotational direction from a pressing surface formed on the driving plate, and the pressed portion has a shape in which a contact surface pressed by the pressing surface bulges in a convex shape. And the moment distance from the rotation center of the hook of the point of action of the pressing force applied to the contact surface increases as the pressed portion is pushed by the driving plate and rotates. The locking device is characterized in that the pressed parts are arranged in such a way. The locking device according to claim 1,
The hook is rotated by being pushed by the striker within one quadrant of which the shape is divided into four quadrants with the rotation center of the hook as the origin, and the striker is sandwiched between the recess and In the other quadrant adjacent to the direction in which the hook is pushed from one quadrant, the pressed portion is rotated in the direction of rotation of the hook by the rotation center of the drive plate and the drive plate. The locking device is characterized in that an area portion to be pressed is set. The locking device according to claim 1 or 2,
The pressed portion is formed in a triangular shape whose entire shape is tapered toward the contact surface bulging in a convex shape that comes into contact with the pressing surface, and the contact surface bulging in a convex shape is A locking device characterized by being formed into a shape rounded into an arc.

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