JP2012035651A - Lock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a driving plate to be deformed stably without depending on a contact position with a hook when the hook presses and deforms the driving plate on action of a large load.SOLUTION: The hook 20 is rotated by being pressed by the movement of a striker S that enters a recessed part 11 of a base board 10 and put into a state of clamping the striker S between itself and the recessed part 11. A pole 30 restricts the returning rotation of the hook 20 by engaging with the hook 20. The driving plate 40 presses a pressed part 26 of the hook 20 by rotation that receives an urging force of a spiral spring 80 and rotates the hook 20 in the direction of narrowing a gap from the recessed part 11. In the driving plate 40, a through-hole 41, which accelerates deformation by generating local stress concentration when compression load accompanied by forced displacement is inputted, is formed along with the hook 20. Furthermore, at the peripheral part of the through-hole 41, a curved part 44 is formed that makes the peripheral part easy to deform by buckling to the input of the compression load.

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.

  This driving plate receives a strong force in the direction in which the striker is relatively removed from the recess when a vehicle collision occurs, and the hook is pushed with a strong force by the striker and receives a strong pressing force from the hook. In addition, a through-hole that functions as a weakened portion that allows the driving plate to be deformed by taking the initiative is formed. As a result, when the hook receives the above-mentioned strong force, it pushes the driving plate in the reverse direction and rotates it backwards with the pole so that the anti-rotation state by the pole is not removed and the hook plate is crushed. In this way, it is possible to stably take the state where the rotation is stopped by hitting the pole.

International Publication No. 2008/126479

  However, in the prior art disclosed above, the driving plate is apt to deform and easily deform the through-hole when the pressing force from the hook acts on the formation region of the through-hole. When a pressing force from the hook is applied so as not to cover the formation region, the structure is relatively difficult to deform and stable deformation is difficult to obtain. The present invention was devised as a solution to the above-mentioned problem, and the problem to be solved by the present invention is that when the hook presses and deforms the driving plate when a heavy load is applied, the driving plate is used as the hook. It is to be able to be stably deformed regardless of the contact position.

  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 pivotally supported by the base plate, and when the hook is in a state of holding the striker, the pole is engaged with the hook and the return rotation of the hook is restricted. The driving plate is pivotally supported by the base plate, and the hook whose return rotation is restricted by the pole is pressed by the rotation received by the urging force of the spring, and is rotated in a direction to close the gap between the hook and the recess. . When a compressive load accompanied by a forced displacement of the hook is input to the driving plate, a through hole is formed penetrating in the thickness direction to generate local stress concentration and promote deformation of the driving plate. Furthermore, the weak part which makes it easy to carry out buckling deformation of the peripheral part with respect to the input of the said compressive load is formed in the peripheral part of the through-hole.

  According to the first aspect of the present invention, the thrust plate is formed with a through hole that functions as a deformation promoting portion, so that when the compressive load acts on the formation region of the through hole, The hook is deformed in such a manner that the hook is returned to the position where the rotation is restricted by the pole and the rotation is returned to the position where the rotation is restricted, and the hook can be kept in the locked state with the striker sandwiched by the rotation restricting strength of the pole. Further, the driving plate is formed so that the compressive load is not applied to the through-hole forming region because the weakened portion is formed at the peripheral portion of the through-hole, that is, it is applied to the peripheral portion of the through-hole. Even in the case of action, the peripheral portion is buckled and deformed so that the hook can be kept in a locked state with the striker sandwiched therebetween. Thus, the driving plate can be stably deformed regardless of the contact position with the hook.

  Next, according to a second aspect of the present invention, in the first aspect described above, the fragile portion is a bent portion in which at least a part of the peripheral portion is bent into the hole of the through hole so that the peripheral portion is easily buckled and deformed. It is formed as.

  According to the second aspect of the invention, the weakened portion is formed as a bent portion in which at least a part of the peripheral portion of the through hole is bent into the hole of the through hole, thereby widening the installation space of the driving plate. It is possible to form a weak part.

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. FIG. 5 is a diagram showing a state in which a driving plate is deformed by the action of a heavy load from the state of FIG. 4. FIG. 6 is a diagram showing a state in which the driving plate is deformed by the action of a heavy load from the state of FIG. 5. It is a figure which shows the state which the drive-in plate deform | transformed by the effect | action of a heavy load from the state of FIG.

  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. In the driving plate 40, a through hole 41 penetrating in the plate thickness direction (axial direction) is formed in an arm portion (corresponding to a pressing portion of the present invention) extending toward the left side of the drawing. In this through hole 41, a pin 32 formed so as to protrude from the pole 30 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).

  Here, the pressed portion 26 of the hook 20 described above is formed in a triangular shape whose 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 like a circle 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.

  By the way, as shown in FIG. 2, the central portion of each peripheral portion is bent into the hole of the through hole 41 at each of the lower and upper peripheral portions of the through hole 41 formed in the driving plate 40 described above. Shaped bends 44 and 45 are formed. As shown in FIGS. 9 to 11, the through-hole 41 and the curved portions 44 and 45 cause a vehicle collision between the lock device 5 and the striker S when the lock device 5 is locked to the striker S. When a large load is input and a strong force is applied to the striker S to be removed from the concave portion 11 to the lower side in the drawing, the pushing plate 40 is moved by the force of the hook 20 pushed around by this force. It functions as a fragile part to make it easy to transform. Specifically, in the state where the pressing surface 42 is in contact with the contact surface 26 </ b> A of the pressed portion 26 of the hook 20, a strong force in the clockwise direction is input to the hook 20. Then, the pressing surface 42 receives a strong force in the compression direction by the pressed portion 26 and deforms by crushing the through-hole 41 or buckling and deforming the peripheral portion of the through-hole 41 in which the curved portions 44 and 45 are formed. It is like that.

  As a result, when the hook 20 is rotated by receiving the above strong force, the push plate 26 is rotated in the reverse direction (clockwise direction in the figure) by the pressed portion 26 so that the hook 20 is rotated in the reverse direction. Without removing the anti-rotation state by 30, the driving plate 40 is crushed by the initiative, and the corner portion 25 of the hook 20 is pressed against the corner portion 31 of the pole 30 having sufficient anti-rotation strength to stop the rotation. In this state, the locked state can be stably held so that the striker S does not come off from the recess 11.

  Here, as described above with reference to FIGS. 4 to 6, the rotational movement amount by which the driving plate 40 drives the hook 20 varies depending on the diameter of the striker S (S1 to S3). Thereby, the part surface where the pressing surface 42 of the driving plate 40 contacts the contact surface 26A of the pressed portion 26 of the hook 20 differs depending on the diameter of the striker S (S1 to S3), and as shown in FIG. The contact surface 26A of the pressed portion 26 comes into contact with a portion surface near the lower end side of the pressing surface 42 in the drawing, or the pressed portion 26 is placed on a portion surface near the center of the pressing surface 42 as shown in FIG. The contact surface 26A may be in contact with the contact surface 26A, or the contact surface 26A of the pressed portion 26 may be in contact with the surface of the pressing surface 42 near the upper end in the drawing as shown in FIG.

  At this time, as shown in FIG. 5, when the pressing force applied from the pressed portion 26 to the pressing surface 42 acts on the formation region of the through hole 41 (applies through the formation region of the through hole 41). In addition, as shown in FIG. 10, the drive-in plate 40 is deformed so that the pressing surface 42 is recessed so as to crush the through hole 41. Further, as shown in FIG. 4, the driving plate 40 acts so that the pressing force applied from the pressed portion 26 to the pressing surface 42 is not applied to the formation region of the through hole 41 (does not pass through the formation region of the through hole 41. In other words, even when the pressing force acts on the lower peripheral portion of the through hole 41 in the figure, a curved portion capable of promoting buckling deformation in the peripheral portion. Since 44 is formed, as shown in FIG. 9, the bent portion 44 is crushed and easily deformed. Further, as shown in FIG. 6, in the driving plate 40, the pressing force applied from the pressed portion 26 to the pressing surface 42 is applied to the formation region of the through hole 41, but toward the corner of the formation region of the through hole 41. Even when acting in this manner, that is, when the pressing force acts on a portion near the peripheral edge on the upper side of the through hole 41 in the figure, it is possible to promote buckling deformation in the peripheral edge. Since the bendable portion 45 is formed, as shown in FIG. 11, the bendable portion 45 is configured to be crushed and easily deformed.

  In this way, the drive-in plate 40 is configured to be easily deformed regardless of the position on the pressing surface 42 that receives a strong force from the pressed portion 26 of the hook 20. Therefore, the driving plate 40 can be stably deformed regardless of the contact position of the hook 20 with the pressed portion 26 when the load is applied. Each of the curved portions 44 and 45 is formed as a shape in which at least a part of the peripheral edge of the through hole 41 is bent in the hole of the through hole 41, so that the curved portions 44 and 45 are installed on the driving plate 40. It can be formed without expanding the space.

  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 the rotation energizing force to the drive-in plate 40, you may apply other spring members, such as a tension spring. Further, in the above embodiment, the tension spring 70 is exemplified as one that applies the rotational biasing force to the hook 20 and the pole 30, but other springs such as spiral springs are set on the hook 20 and the pole 30, respectively. Also good. Moreover, in the said Example, the bending parts 44 and 45 of the shape which bends toward the inside of the through-hole 41 are formed in the peripheral part of the upper side and lower side of the through-hole 41 which were formed in the driving plate 40, respectively, and a weak part is set Although the fragile portion of the present invention has a configuration in which the peripheral portion of the through hole 41 is partially cut and constricted or bent into a wave shape to easily buckle and deform the peripheral portion. Good. Further, the fragile portion may be configured to be easily buckled and deformed by bending the peripheral portion of the through hole 41 in the thickness direction of the driving plate 40. However, in this case, it is necessary to note that the installation space is increased because the driving plate 40 projects in the thickness direction. Further, the curved portion as the fragile portion is not limited to a shape bent in a U-shape but may be bent in a shape sharp in a V-shape.

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 plate 41 Through hole 42 Press surface 43 Hook 44, 45 Curve 50 Operation plate 51 Fitting hole 52 Hook 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

Claims (2)

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;
Pushing the hook, which is pivotally supported by the base plate and whose return rotation is restricted by the pole, by the rotation received by the biasing force of the spring, and rotates in a direction to close the gap between the hook and the recess. A plate, and
The driving plate is formed with a through-hole penetrating in the plate thickness direction to generate local stress concentration and to promote deformation of the driving plate when a compressive load accompanying forced displacement of the hook is input. Furthermore, a fragile portion is formed on the peripheral portion of the through-hole so as to facilitate the buckling deformation of the peripheral portion with respect to the input of the compressive load. The locking device according to claim 1,
2. The locking device according to claim 1, wherein the fragile portion is formed as a bent portion that makes it easy to buckle and deform the peripheral portion by bending at least a part of the peripheral portion into the hole of the through hole.

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