JP5569230B2 - Locking device - Google Patents

Description

  The present invention relates to a locking device that locks a seat component such as a seat back so as to be fixed at a predetermined position of a vehicle.

A vehicle seat on which a passenger is seated is installed in a vehicle such as an automobile. Such a vehicle seat is known in which a locking device is provided that locks a seat component such as a seat back at a fixed position appropriately set in the vehicle.
The lock device includes a hook for receiving the striker, a base member for storing the striker received by the hook, and a pole for holding or releasing the storage of the striker. The lock device configured as described above can be in an engaged state in which the striker is accommodated and held with respect to the base member, and locks a seat component such as a seat back to a fixed position that is appropriately set in the vehicle. Can do. In addition, when a striker is accommodated in a base member, it is accommodated in the recessed part provided in the base member.

  By the way, in this type of locking device, as described above, when the striker is in an engaged state in which the striker is received and held with respect to the base member, there is provided a push-in plate that further pushes the hook so as to rotate. Is known (for example, see Patent Document 1). In the locking device provided with this additional plate, when the striker is in the engaged state, the hook is further rotated to press the striker accommodated and held in the recess toward the inner peripheral end of the recess. The play (backlash) in the recess of the striker to be accommodated can be eliminated.

International Publication WO2006 / 095517

By the way, the pushing action force of the pushing plate for rotating the hook is due to the biasing force of the attached biasing spring. Here, since the displacement amount of the elastic deformation of the urging spring decreases as the hook approaches the inner peripheral end of the recess, the urging force by the urging spring also decreases as the hook approaches the inner peripheral end of the recess. For this reason, when the hook approaches the inner peripheral end of the recess and presses a striker with a small outer diameter, the striker is pressed with a smaller pressing force than when a striker with a large outer diameter is pressed. Become.
If it does so, a striker may not be pressed well by a crevice, and there is a possibility that this striker may rattle inside a crevice. For this reason, even when such a hook presses the striker in the state of approaching the inner peripheral end of the recess, there is a demand for preventing the pressing force of the hook striker from becoming too small.

  The present invention has been made in view of such circumstances, and the problem to be solved by the present invention is a locking device that locks a seat component such as a seat back so as to be fixed at a predetermined position of a vehicle. Even if the striker is pressed with the hook approaching the inner peripheral edge of the recess without changing the size of the biasing spring itself, the striker should be hooked so that the pressing force of the hook does not become too small. It is to be able to press.

In order to solve the above problems, the locking device according to the present invention employs the following means.
The locking device includes a moving component such as a seat that is movably mounted on the vehicle, and a fixed configuration such as a vehicle interior forming member that is positioned in a moving range of the moving component and fixes the moving component. A striker is disposed on one of the elements, and the other element is engaged with the striker to bring both of these elements into a fixed locked state.
That is, as described above, the locking device according to the first aspect of the present invention is provided on one of the two members provided in the vehicle, and engages with the striker provided on the other of the two members. And a base member having a recess capable of receiving the striker, and a base member rotatably supported by the base member. A hook in which the striker is sandwiched between the concave portion and a hook that is pivotally supported by a pivot support shaft fixed to the base member so as to be pinched. A pole that engages so as to hold a fixed lock state, and further holds the striker that is pivotally supported by the pivot support shaft of the pole and that is in the fixed lock state. And a spiral spring for urging the push-in plate so as to push the push-in plate into the hook. The inner end side is supported by the rotation support shaft so that the center position of the spiral spring is positioned at the rotation eccentric position shifted with respect to the rotation support shaft that is the rotation center axis of the additional plate. However, the outer end side is engaged with the follow-up plate to bias the follow-up plate.

According to the lock device according to the first aspect of the present invention, the push-in plate is pushed into the hook by the biasing force of the spiral spring so that the hook in the clamped state is further rotated. The spiral spring that urges the push-in plate urges the push-in plate by the inner end side being supported by the rotation support shaft and the outer end side being locked to the push-in plate. Here, the spiral spring is positioned at a rotational eccentric position in which the center position of the spiral spring is shifted with respect to the rotational support shaft that is the rotational central axis of the follow-up plate. The biasing direction in which the spiral spring is biased is set to a direction shifted from the rotation direction of the follow-up plate. That is, the displacement direction of the elastic deformation of the spiral spring does not follow the rotation direction of the follow-up plate. For this reason, the decrease in the amount of displacement of the elastic deformation of the spiral spring cannot be reduced corresponding to the rotation of the follow-up plate.
As a result, the decrease in the amount of displacement of the elastic deformation of the spiral spring due to the rotation of the follow-up plate is less than the previous state where the amount of displacement decreases corresponding to the rotation of the add-in plate. Can be small.
Therefore, even when the follow-up plate is rotated so as to further rotate the hook, it is possible to reduce the decrease in the urging force of the spiral spring, and to reduce the decrease in the push-in action force on the hook of the add-in plate. It can be planned.
Therefore, according to the lock device according to the first aspect of the present invention, even when the hook is pressed against the inner peripheral end of the recess without changing the size of the biasing spring itself, It is possible to reduce a decrease in the force of pushing into the hook, and the striker can be pressed by the hook so that the pressing force of the hook does not become too small.

  The locking device according to a second aspect of the invention is the locking device according to the first aspect of the invention, wherein the distance from the center of the spiral spring to the outer end side of the spiral spring is the rotational support shaft in the state before the pushing-in action. The distance from the center of the spiral spring to the outer end side of the spiral spring is set to be longer than the distance from the center of the spiral spring. It is set so that it may become shorter than the distance from the center of a support shaft to the outer side end side of this spiral spring.

According to the lock device according to the second aspect of the present invention, in the push-in action state, the distance from the center of the spiral spring to the outer end side of the spiral spring is opposite from the center of the rotation support shaft, as opposed to the state before the push-in action. Since it is set to be shorter than the distance to the outer end side of the spiral spring, it is possible to effectively reduce the gradient of the decrease change in the amount of displacement of the spiral spring due to the rotation of the follow-up plate. it can.
As a result, a decrease in the urging force of the spiral spring can be reduced, and the striker can be reliably pressed until the striker is free from rattling of the striker plate to the hook.

According to the locking device according to the first aspect of the present invention, even when the hook is pressed against the inner peripheral end of the recess without changing the size of the biasing spring itself, It is possible to reduce the decrease in the pushing-in force and press the striker with the hook so that the pressing force of the hook does not become too small.
According to the lock device according to the second aspect of the present invention, it is possible to reduce the decrease in the urging force of the spiral spring, and to reliably push the striker until the striker is free from rattling of the striker plate to the hook. Can do.

It is a side view which shows the vehicle seat by which a locking device is arrange | positioned. It is an internal enlarged view which shows the inside of the locking device which removed the pushing-in mechanism. It is an internal enlarged view which shows the inside of the locking device equipped with the follow-up mechanism. It is an enlarged view which shows the follow-up mechanism before follow-up. It is an enlarged view showing a follow-up mechanism after the push-in. It is a front enlarged view which expands and shows a spiral spring. It is a comparative table | surface which shows the change of the torque with respect to an angular displacement. It is a comparative graph which shows the change of the torque with respect to an angular displacement.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a vehicle seat 10 on which a locking device 20 is disposed. A vehicle seat 10 shown in FIG. 1 is installed inside an automobile as a vehicle, and is seated by an occupant. The vehicle seat 10 in FIG. 1 is shown as being forward-turned, and includes a seat cushion 11, a seat back 13, and a headrest 14. The seat cushion 11 includes a cushion frame 111 that forms a framework, and the seat back 13 is coupled to the seat cushion 11 via a coupling device 12.
The vehicle seat 10 is installed fixedly to the vehicle body floor F by connecting the front and rear (front and rear with respect to the seating posture) portions of the seat cushion 11 to the vehicle body floor F. Specifically, the lower front portion of the cushion frame 111 is pivotally coupled to the bracket member 16 that is fixedly installed on the vehicle body floor F. In addition, a locking device 20 that engages with a striker T that is fixedly installed on the vehicle body floor F is provided at a lower rear portion of the cushion frame 111. That is, the locking device 20 is provided at the lower rear portion of the cushion frame 111 corresponding to one of the two members according to the present invention. A striker T is provided on the vehicle body floor F corresponding to the other of the two members according to the present invention. The locking device 20 is engaged with a striker T provided on the vehicle body floor F, so that the vehicle seat 10 (cushion frame 111) can be fixedly locked to the vehicle body floor F. The striker T is formed in an appropriately bent columnar shape and is disposed so as to protrude upward with respect to the vehicle body floor F.
That is, the striker T is disposed on the vehicle body floor F, which is a fixed component for fixing the vehicle seat 10, so as to be located in the movement range of the vehicle seat 10. Here, a lock device 20 described in detail below is disposed on the vehicle seat 10 which is a moving component that is movably mounted on the vehicle. The locking device 20 is engaged with the striker T to place the vehicle seat 10 in a fixed locked state with respect to the vehicle body floor F.

Next, the locking device 20 will be described. FIG. 2 is an enlarged view showing the locking device 20 with the follow-up mechanism 60 removed when showing the inside of the locking device 20. FIG. 3 is an enlarged view showing the lock device 20 in a state in which the follow-up mechanism 60 is attached to show the inside of the lock device 20. For this reason, in FIG. 2, the hidden part can be seen by the follow-up mechanism 60 drawn in FIG.
As shown in FIG. 2, the locking device 20 generally includes a base plate 21 as a base member, a first pivot support member 31 and a second pivot support member 35 supported by the base plate 21, and a first pivot support member. A hook 40 pivotally supported by 31, a pole 50 pivotally supported by the second pivot member 35, and a lever member 90 that fits and substantially integrates the pole 50; A coil spring 95 that is hooked on the hook 40 and the lever member 90 is provided. The locking device 20 is configured by adding a follow-up mechanism 60 shown in FIG. 3 to various members shown in FIG.

The rotation support shaft disposed on the base plate 21 will be described with reference to FIG. The base plate 21 is provided with the hook 40, the pole 50, the lever member 90, the follow-up mechanism 60, and the like as a rotation support shaft for pivotally supporting the base plate 21 with respect to the base plate 21. The first shaft support member 31 and the second shaft support member 35 are fixedly attached. For this reason, the base plate 21 is provided with two shaft support holes for arranging the first shaft support member 31 and the second shaft support member 35 in a fixed state. As shown in FIG. 1, the base plate 21 is attached to the cushion frame 111 with a screwing member (not shown).
The first shaft support member 31 pivotally supports the hook 40 and is fixed to the base plate 21 as described above. The second shaft support member 35 also supports the pole 50, the lever member 90, and the push-in plate 61 of the push-in mechanism 60 so as to be rotatable, and is fixed to the base plate 21. Note that the pole 50, the lever member 90, and the follow-up plate 61 are disposed adjacent to and supported by the second shaft support member 35 so as to overlap each other. The second shaft support member 35 is provided with a spring locking groove 37 for locking a locking inner end 72 serving as an inner end portion of a spiral spring 71 described later. The spring locking groove 37 is a portion where a locking inner end 72 of a spiral spring 71, which will be described in detail later, is locked, and the push-in plate 61 rotates at the central portion of the spring locking groove 37. Coincides with the center of rotation.
The base plate 21 is provided with a recess 25 that can receive the striker T. The recess 25 is formed in a shape in which the inner peripheral end 26 is formed in an arc shape and the notch range is enlarged toward the opening side. Here, in the inner peripheral end 26 which is disposed in the concave portion 25 and becomes the innermost (uppermost position in the figure) portion of the arc shape, an arc is formed as an opposing surface in sandwiching the striker T. It has become. For this reason, when the striker T is pressed against the inner peripheral end 26 of the recess 25 by the hook 40, the striker T is pressed toward the inner peripheral end 26 of the recess 25. That is, the backlash movement of the striker T is regulated so that the backlash of the striker T in the recess 25 is eliminated.

Next, the hook 40 will be described. The hook 40 is turned into a sandwiched state in which the striker T is sandwiched and sandwiched together with the concave portion 25 of the base plate 21, and a sandwiched release state in which the striker T is released to release the striker T by turning. The state is configured to be switchable. Specifically, as shown in FIGS. 2 and 3, the hook 40 roughly includes an inner jaw member 41 and an outer jaw member 43. Here, a clamping recess 45 for clamping the striker T is formed between the inner jaw member 41 and the outer jaw member 43 together with the recess 25 of the base plate 21.
The inner jaw member 41 constitutes an inner part of the holding recess 45 and is supported by the first shaft support member 31 so as to be rotatable. In addition, the inner jaw member 41 is provided with a loose fitting boss 42 that is integrated so as to be interlocked with the outer jaw member 43. The outer jaw member 43 constitutes an outer portion of the holding recess 45 and is supported by the first shaft support member 31 so as to be rotatable, like the inner jaw member 41. The outer jaw member 43 is provided with a boss hole 44 into which the loose fitting boss 42 of the inner jaw member 41 is fitted so as to be interlocked with the inner jaw member 41 described above. In this way, the inner jaw member 41 and the outer jaw member 43 are integrated so as to be interlocked with each other, and the hook 40 is configured while the sandwiching recess 45 is formed therebetween.
Further, the hook 40 thus configured is always urged by the coil spring 95. Specifically, the inner jaw member 41 is formed with a hooking portion 46 on which one end of the coil spring 95 is hooked at a position opposite to the side where the holding recess 45 is disposed. One end of a coil spring 95 is hung on the hooking portion 46 of the inner jaw member 41. The other end of the coil spring 95 is hooked on a hook portion 96 of a lever member 90 described later. For this reason, the hook 40 including the inner jaw member 41 is urged counterclockwise by the elastic contraction force of the coil spring 95. On the other hand, the lever member 90 is urged in the clockwise direction in the figure by the elastic contraction force of the coil spring 95.

By the way, the above-described sandwiching recess 45 is formed in a concave shape that can receive the striker T, and the opening direction is in a direction intersecting with the opening direction of the recess 25 of the base plate 21. For this reason, when the opening direction of the recessed part 25 of the base plate 21 and the holding recessed part 45 of the hook 40 is in the same direction, the holding state is released to release the striker T and release the striker T. When the opening direction is in the crossing direction, the striker T is sandwiched.
Further, the hook 40 configured as described above is configured to restrict the rotation of the hook 40 by the pole 50 when the striker T is sandwiched. Specifically, in the outer jaw member 43 constituting the hook 40, when the striker T is sandwiched, the outer jaw member 43 contacts the pole 50 so as to restrict the rotation of the hook 40 in this state. It has become a thing. Specifically, the outer jaw member 43 is provided with a pole contact receiving portion 47 for restricting the rotation of the hook 40 when the striker T is sandwiched. The pole contact receiving portion 47 is formed to have a shape that appropriately protrudes outward in the rotational radial direction of the hook 40, and the contact end portion 55 of the pole 50 along the rotational direction of the hook 40. It is formed so that it can be in surface contact. For this reason, when the pole contact receiving portion 47 of the outer jaw member 43 is in surface contact with the contact end portion 55 of the pole 50 as described above, the hook 40 is turned by the biasing force of the coil spring 95. The state where the striker T is sandwiched is maintained. Further, the outer jaw member 43 is provided with a boss 49 for follow-up for receiving a push-in action by a push-in plate 61 of a push-in mechanism 60 (see FIG. 3) described later. As will be described in detail later, the inclined contact surface 65 of the additional plate 61 of the additional mechanism 60 contacts the additional boss 49. That is, the portion of the inclined contact surface 65 where the follow-up boss 49 abuts moves on the inclined contact surface 65 along the rotation of the add-in plate 61, and the movement of the abutting portion causes the movement of the contact portion. The hook 40 is subjected to a follow-up action.

Next, the pole 50 will be described with reference to FIG. The pole 50 is rotatably supported by the second shaft support member 35 described above, and functions to restrict the rotation of the hook 40 in a state where the striker T is sandwiched (a sandwiched state). That is, the pole 50 functions to engage with the hook 40 in a state of sandwiching the striker T so as to hold the state of sandwiching the hook 40 and to enter the above-described fixed lock state. For this reason, the pole 50 is provided with an insertion hole 51 through which the second shaft support member 35 is inserted at the rotation center position, and the pole abutment receiving portion 47 faces the outer end portion on the outer side in the rotation radial direction. An abutting end 55 for abutting is formed. Here, the pole 50 is fixedly locked so as to hold the hook 40 held when the contact end portion 55 of the pole 50 is in surface contact with the pole contact receiving portion 47 of the hook 40. It becomes. The pole 50 is provided with a boss hole 54 into which the loose boss 92 of the lever member 90 is fitted so as to be interlocked with the lever member 90. The pole 50 is also provided with a loose fitting convex portion 52 that is loosely fitted into an EA hole 63 of a follow-up plate 61 described later.
The lever member 90 will be described with reference to FIG. The lever member 90 forcibly rotates the pawl 50 by an occupant unlocking operation. The lever member 90 is also rotatably supported by the second shaft support member 35 as in the case of the pole 50. The lever member 90 is connected to an operation cable 97 (only part of which is shown in FIG. 2) that is pulled by an occupant's unlocking operation. In the lever member 90, a loosely fitting boss 92 that is fitted into the boss hole 54 of the pole 50 is provided so as to be interlocked with the pole 50. In other words, the lever member 90 can be interlocked with the pawl 50 by receiving an occupant unlocking operation from the operation cable 97. That is, by receiving the occupant's unlocking operation, the pole 50 is forcibly rotated to release the surface contact of the contact end portion 55 with respect to the pole contact receiving portion 47, and the striker T of the hook 40 is released. The holding state is released. The lever member 90 is provided with a hooking portion 96 for hooking the other end of the coil spring 95 as described above.

Next, the follow-up mechanism 60 will be described with reference to FIGS. FIG. 4 is an enlarged view showing the driving mechanism 60 before the driving. FIG. 5 is an enlarged view showing the driving mechanism 60 after the driving. That is, as shown in FIGS. 4 and 5, the push-in mechanism 60 performs a push-up action so that the hook 40 holding the striker T fixed by the pole 50 is further rotated in the holding direction. It functions.
The follow-up mechanism 60 further rotates the hook 40 in the clamping state in the direction in which the striker T is clamped so as to change from the state shown in FIG. 4 to the state shown in FIG. This follow-up mechanism 60 generally includes a follow-up plate 61 and a spiral spring 71. Note that the push-in plate 61 is a direct member that functions so as to further push the hook 40 in the direction in which the hook 40 is further clamped, and the spiral spring 71 is used to push the hook 40 in this way. It is a member that biases the follow-up plate 61.
As shown in FIG. 3, the follow-in plate 61 is rotatably supported by the second shaft support member 35 that rotatably supports the pole 50 described above. Therefore, as shown in FIGS. 4 and 5, an insertion hole 62 through which the second shaft support member 35 is inserted is provided at the rotation center S <b> 1 position of the follow-up plate 61. In addition, an inclined abutment surface 65 is formed on the outer peripheral portion of the follow-up plate 61 so as to abut on the push-in boss 49 of the hook 40 described above. The inclined contact surface 65 is formed in an inclined shape that keeps the follow-up boss 49 of the abutting hook 40 away from the rotational center S1 position of the follow-up plate 61 when the follow-up plate 61 rotates clockwise in the figure. In addition, the action of moving the boss 49 for follow-up away from the rotation center S1 position by the follow-up plate 61 is the follow-up action. In addition, the inclined contact surface 65 is provided with a restricting convex portion 66 that limits the follow-up action at the limit end position where the follow-up action to the follow-up boss 49 is limited. Further, in the follow-up plate 61, a space between the insertion hole 62 and the inclined contact surface 65 is formed as an EA (Energy Absorb) hole 63 that is hollowed out (so-called thinning). Further, a locking outer end 73 serving as an outer end portion of a spiral spring 71 to be described below is locked to a portion of the above-described additional plate 61 opposite to the side where the inclined contact surface 65 is formed. A spring locking portion 68 is formed. The spring locking portion 68 is formed to have a shape protruding in an arm shape from the rotation center position of the follow-up plate 61 to the outer side in the rotation radial direction. 73 is to be locked.

As shown in FIG. 3, the spiral spring 71 is formed in an eccentric spiral shape, and the locking inner end 72 is locked in the spring locking groove 37 of the second shaft support member 35. The end 73 is locked to the spring locking portion 68 of the push-in plate 61. The spiral spring 71 is configured to lock the locking inner end 72 serving as the inner end portion in the spring locking groove 37 and to lock the locking outer end 73 serving as the outer end portion to the spring locking portion 68. Is configured to lock the spiral springs 71 having a natural length in a state where the spiral springs 71 are pulled in the spiral direction. Here, since the spring locking groove 37 locked by the locking inner end 72 is fixed by the second shaft support member 35, the urging force that the spiral spring 71 tries to return to the natural length is applied to the locking outer end. 73 is urged as a movement to move clockwise in the figure. That is, the spiral spring 71 locked by the locking inner end 72 and the locking outer end 73 urges the driving plate 61 so as to rotate the driving plate 61 clockwise in the figure.
Next, a specific shape of the spiral spring 71 will be described. FIG. 6 is an enlarged front view showing the spiral spring 71 in an enlarged manner. As shown in FIG. 6, the spiral spring 71 is formed in an eccentric spiral shape, unlike an ordinary spiral spring that is widely used. That is, although not shown in particular, a widely used normal spiral spring has a locking inner end serving as a locking inner end positioned at the center position of a spirally formed vortex. In this embodiment, the locking inner end 72 of the spiral spring 71 is set to be located at an eccentric position (rotation center S1) displaced from the position S2 of the spirally formed vortex. Specifically, as shown in FIG. 6, the locking inner end 72 of the spiral spring 71 is formed in a spring locking groove 37 disposed in the second shaft support member 35 that is the rotation center S <b> 1 of the follow-up plate 61. It is to be locked against. Here, the position of the center S2 of the spiral spring 71 is the position of the vortex center S2 serving as the eccentric eccentric of the follow-up plate 61 shifted with respect to the second pivotal support member 35 serving as the rotation center S1 of the follow-up plate 61. It is set to be located at. The eccentric length (shift length) between the rotation center S1 of the follow-up plate 61 and the vortex center S2 that is the rotation eccentricity is appropriately set in consideration of the size and winding amount of the spiral spring 71. Has become.

Here, the locking inner end 72 that is the inner end side is set to the rotation center S1 that is an eccentric position displaced from the vortex center S2 as described above and is locked to the spring locking groove 37, whereas The locking outer end 73 on the outer end side is set as follows.
That is, as shown in FIG. 4, in the state before the follow-up action by the spiral spring 71, as shown in FIG. 6, the angular displacement of the spiral spring 71 with respect to the natural length (indicated by reference numeral 731) is 70 degrees to 120 degrees. Is set in between. Here, as shown in FIG. 6, the distance l2 from the vortex center S2 of the spiral spring 71 to the locking outer end 733 (73) is from the rotation center S1 of the follow-up plate 61 to the locking outer end 733 (73). Is set to be longer than the distance L2. That is, in the state before the pushing-in action, the spiral spring 71 is disposed so that “l2> L2” is satisfied.
On the other hand, as shown in FIG. 5, when the spiral spring 71 is in the driving action state, the angular displacement of the spiral spring 71 with respect to the natural length (indicated by reference numeral 731) is set to a range of 70 degrees or less. Here, as shown in FIG. 6, the distance l1 from the vortex center S2 of the spiral spring 71 to the locking outer end 732 (73) is from the rotation center S1 of the follow-up plate 61 to the locking outer end 732 (73). Is set to be shorter than the distance L1. That is, in the push-in action state, the spiral spring 71 is disposed so that “L1> 11” is satisfied.
Here, as shown in FIG. 6, “torque for turning the follow-in plate 61 == [spring torque of the spiral spring 71] × L ÷ l”. Note that L = [distance from the rotation center S1 to the locking outer end 73] and l = [distance from the vortex center S2 to the locking outer end 73]. For this reason, [torque to rotate] the follow-up plate 61 in the follow-up action state is the displacement amount of l = [distance from the vortex center S2 to the locking outer end 73], L = [rotation center S1 The change gradient can be made relatively small as compared with the displacement amount of the distance to the stop end 73].

For this reason, according to the locking device 20 in this embodiment, the following operational effects can be achieved.
In other words, according to the locking device 20, the push-in plate 61 can be pushed into the hook 40 by the urging force of the spiral spring 71 so as to further rotate the clamped hook 40. In other words, the spiral spring 71 that urges the push-in plate 61 has the lock inner end 72 supported by the second shaft support member 35 and the lock outer end 73 locked to the push-in plate 61 so that the push-in plate 61 is supported. Will be energized. Here, the spiral spring 71 is rotated in such a manner that the position of the (vortex) center S2 of the spiral spring 71 is shifted with respect to the center position of the second shaft support member 35 that becomes the rotation center S1 of the additional plate 61. Since it is located at the eccentric position, the biasing direction in which the spiral spiral spring 71 biases is set to a direction shifted from the rotational direction of the follow-up plate 61. That is, the displacement direction of the elastic deformation of the spiral spring 71 does not have to follow the rotation direction of the follow-up plate 61. For this reason, the decrease in the amount of displacement of the elastic deformation of the spiral spring 71 cannot be reduced in accordance with the rotation of the follow-up plate 61.
As a result, the decrease in the amount of displacement of the elastic deformation of the spiral spring 71 due to the rotation of the push-in plate 61 is a decrease change compared to the previous state in which the amount of displacement decreases corresponding to the turn of the push-in plate 61. The gradient of can be reduced. Therefore, even when the push-in plate 61 is rotated so as to further rotate the hook 40, the decrease in the urging force of the spiral spring 71 can be reduced, and the push-in action force of the push-in plate 61 onto the hook 40 can be reduced. It is possible to reduce the decrease in the above. Therefore, according to the locking device 20 described above, the hook 40 presses the striker T in a state in which the hook 40 approaches the inner peripheral end 26 of the recess 25 without changing the size of the spiral spring (biasing spring) itself. However, it is possible to reduce a decrease in the pushing force of the pushing plate 61 to the hook 40, and the hook 40 can press the striker T so that the pressing force of the hook 40 does not become too small.

FIG. 7 is a comparison table showing changes in torque with respect to the angular displacement of the spiral spring 71. FIG. 8 is a comparison graph showing a change in torque with respect to the angular displacement of the spiral spring 71, which is created based on the comparison table of FIG. The comparison performed in FIG. 7 and FIG. 8 is performed using a conventional locking device that uses a widely used normal spiral spring and a spiral spring 71 in which the locking inner end 72 is set in an eccentric position. It is between the locking device 20 of the form.
That is, according to the locking device 20 described above, the [torque to rotate] the follow-up plate 61 in the follow-up action state is compared with the displacement amount of L = [distance from the rotation center S1 to the locking outer end 73]. Thus, the displacement amount of l = [distance from the vortex center S2 to the locking outer end 73] can be made relatively small. That is, in the pushing-in action state, contrary to the state before the pushing-in action, the distance l from the vortex center S2 of the spiral spring 71 to the outer locking end 73 of the spiral spring 71 is the rotation center S1 of the second shaft support member 35. Is set to be shorter than the distance L from the locking outer end 73 of the spiral spring 71. As a result, as shown in FIG. 8, the change gradient of the torque of the elastic deformation of the spiral spring 71 due to the rotation of the follow-in plate 61 is compared with the case of using a conventional spiral spring widely used. It can be effectively reduced. Accordingly, the decrease in the urging force of the spiral spring 71 can be reduced, and the pushing-in action of the pushing-in plate 61 to the hook 40 is arranged in the recess 25 until the striker T is free from rattling. The striker T can be pressed toward the inner peripheral end 26.

Note that the locking device according to the present invention is not limited to the above-described embodiment, and may be configured by appropriately changing the location as follows.
That is, in the above-described locking device 20, what is disposed at the lower rear portion of the cushion frame 111 of the vehicle seat 10 has been described. However, the locking device according to the present invention may be disposed, for example, with respect to the back door at the rear of the vehicle, and fixes the moving component and the moving component that are movably mounted on the vehicle. As long as it is provided for any one of the fixed components, the vehicle can be provided for an appropriate vehicle component.
Further, the base member, hook, pole, and follow-up plate in configuring the locking device according to the present invention are not limited to the configuration in the above-described embodiment, and are configured by changing appropriate portions. It may be done. For example, the hook in the above-described embodiment is configured to be divided. However, this may be configured as a hook with one member.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 11 Seat cushion 111 Cushion frame 12 Connecting device 13 Seat back 14 Headrest 16 Bracket member 20 Locking device 21 Base plate (base member)
25 Recessed portion 26 Inner peripheral end 31 First shaft support member (rotating support shaft)
35 Second shaft support member (rotating support shaft)
37 Spring locking groove 40 Hook 41 Inner jaw member 42 Free fitting boss 43 Outer jaw member 44 Boss hole 45 Holding recess 46 Hooking part 47 Pole contact receiving part 49 Push-in boss 50 Pole 51 Insertion hole 52 Free fitting convex Portion 54 Boss hole 55 Contact end 60 Drive mechanism 61 Drive plate 62 Insertion hole 63 EA hole 65 Inclined contact surface 66 Restriction convex part 68 Spring locking part 71 Spiral spring 72 Locking inner end (inner end of spiral spring) )
73 (731, 732, 733) Locking outer end (outer end of spiral spring)
90 Lever member 92 Loose fitting boss 95 Coil spring 96 Hooking part 97 Operation cable F Body floor T Strike S1 Center of rotation S2 Center of vortex

Claims (1)

A locking device that is provided on one of the two members disposed in the vehicle and engages with a striker provided on the other of the two members to place the two members in a fixed locked state,
A base member having a recess capable of receiving the striker;
A hook that is pivotally supported by the base member and sandwiches the striker with the concave portion of the base member;
A pole that is pivotally supported by a pivot support shaft fixed to the base member and engages the hook in the clamped state so as to hold the clamped state, and is in a fixed lock state;
A push-in plate that is pivotally supported by the pivot support shaft of the pole and pushes the hook in the clamped state further in a direction to further clamp the striker in the fixed lock state. When,
A spiral spring that urges the pushing plate so as to push the pushing plate into the hook;
The spiral spring is supported at its inner end so that the center position of the spiral spring is located at a rotational eccentric position shifted with respect to the rotational support shaft serving as the rotational central axis of the additional plate. while being supported on the shaft outer end engaged with the thrust plate, Ri Contact biases the thrust plate,
In the state before the driving action, the distance from the center of the spiral spring to the outer end side of the spiral spring is set to be longer than the distance from the center of the rotation support shaft to the outer end side of the spiral spring. And
In the driving action state, the distance from the center of the spiral spring to the outer end side of the spiral spring is set to be shorter than the distance from the center of the rotation support shaft to the outer end side of the spiral spring. And
An urging direction of an outer end portion of the spiral spring to which the driving plate is locked is directed from the rotation center axis of the driving plate toward the central position of the spiral spring. Locking device.

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