JP2010274879A - Lock device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock device having a small number of parts with a simple constitution. <P>SOLUTION: This lock device is constituted of a striker 3 and a lock mechanism 20. The lock mechanism 20 includes a base plate 21 having a recessed part 20 capable of accepting the striker 3, a latch 22 for holding the striker 3 between the lock mechanism 20 and the recessed part 30, a pole 23 for holding the latch 22 in a lock state, and a driving plate 24 for pressing the latch 22 in a lock state in a lock direction. The driving plate 24 is arranged oppositely to the pole 23. The latch 22 and the driving plate 24 are integrally rotated with the same axis as a center. Thickness of the pole 23 is almost the same as total thickness of the latch 22 and the driving plate 24. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a locking device including a striker provided on one of two members that are locked to each other, such as locking a vehicle seat on the vehicle body side, and a lock mechanism provided on the other of the two members.

  As this type of locking device, there are Patent Literature 1 and Patent Literature 2 below. In Patent Document 1 and Patent Document 2, in a vehicle having a seat that can be displaced between a use posture locked to the vehicle body side and a retracted posture released from the vehicle body side after being unlocked, a striker on the vehicle body side is disclosed. And a locking mechanism is provided on the seat side. The locking mechanism includes a base plate having a recess capable of receiving a striker, a latch pivotally supported by the base plate and forming a locked state in which the striker is sandwiched between the recess of the base plate, and a position opposite to the latch. A pole that is pivotally supported by the base plate and latched to hold the latch in a locked state, and a driving plate that is pivotally supported by the base plate and presses the locked latch in the locking direction. And at least a spring as a biasing member that applies a biasing force to the pole. The driving plate is engaged with a protrusion provided on the latch or the pole to urge the pole in a predetermined rotation direction in the locked state, thereby further enhancing the engagement of the latch with the striker (locked state). Is being energized. As a result, the striker is more firmly held between the latch and the recess of the base plate, and the play between the striker and the latch in the locked state is absorbed, and backlashing is performed.

  If it sees in detail, in patent document 1, a pole and a drive-in plate (cam member) will be piled up in the thickness direction, and both can rotate mutually mutually centering on the same axis. The latch is arranged to face the pole and the driving plate and rotates in the same plane as the pole, but the rotation surface is different from that of the driving plate. That is, the driving plate and the latch overlap each other in the thickness direction at a portion facing each other so that the driving plate engages with a protrusion provided on one side of the latch. The spring as the urging member includes a first spring that is hung between the latch and the pole, and a second spring that is hung between the driving plate and the base plate. In addition, when an excessive load is applied to the driving plate in a direction in which the striker in the locked state is retracted from the recess of the base plate, the driving plate is deformed in preference to other parts and other members of the driving plate. It has a deformation promoting part to be promoted.

  In Patent Document 2, a latch and a driving plate (backlash removing plate) are overlapped in the thickness direction, but both of them can rotate independently from each other around support shafts provided at different positions. The pole (ratchet) is disposed opposite to the latch and the driving plate and rotates in the same plane as the latch, but the rotation surface is different from that of the driving plate. That is, the driving plate and the pole overlap in the thickness direction at a portion facing each other so that the driving plate engages with a protrusion provided on one side surface of the pole. The spring as the biasing member has only one hung between the driving plate and the pole.

JP 2005-271903 A JP 2005-263109 A

  In Patent Document 1 and Patent Document 2, while the apparatus is made compact by a relatively simple configuration, play between the striker and the latch in the locked state is absorbed by the driving plate and is loosely packed. However, Patent Document 1 and Patent Document 2 still have problems in simplifying and downsizing the apparatus. Specifically, in Patent Document 1, since the pole and the driving plate having the same rotation axis are separately urged and independently rotated, the complicated mechanism as described above is obtained. ing. In Embodiment 3 of Patent Document 1, only one spring that is hooked between the driving plate and the base plate is illustrated, but in reality, another spring that is hooked between the latch and the pole is illustrated. Is also required.

  On the other hand, in Patent Document 2, the driving plate disposed to face the pole is pivotally supported by a support shaft different from the latch that is also arranged to face the pole. That is, the latch and the driving plate are each supported around separate support shafts, and the number of parts (particularly the number of support shafts) is large. An installation space for this is also required, and the apparatus becomes larger. Further, the driving plate of Patent Document 2 is not particularly provided with a deformation promoting portion. In this case, when a heavy load is applied in a direction in which the striker in the locked state is retracted from the recess of the base plate, any member of the latch, the pole, or the driving plate that receives the load directly or indirectly It is not certain that it will be deformed. Moreover, it is not certain which part is deformed. In this case, for example, there is a case where the normal lock state cannot be maintained, for example, the latch or the pole is deformed.

  Further, in Patent Document 1 and Patent Document 2, the pole and the driving plate, or the latch and the driving plate are stacked in the thickness direction, and the protrusion provided on the latch or the pole and the driving plate are engaged with each other. The latch or pole in the positional relationship and the driving plate overlap in the thickness direction. In other words, it is necessary to shift the rotation plane of the driving plate in the thickness direction from the rotation plane of the latch or the pole, and the apparatus is increased in size in the thickness direction.

  Therefore, the present invention solves the above-described problems, and an object of the present invention is to provide a locking device with a simple configuration and a small number of parts.

  The locking device of the present invention includes a striker provided on one of two members locked to each other and a locking mechanism provided on the other of the two members. The lock mechanism includes a base plate having a recess capable of receiving the striker, a latch pivotally supported by the base plate, and forming a locked state in which the striker is sandwiched between the recess of the base plate, A pole that is pivotally supported by the base plate at a position opposite to the latch, and holds the latch in a locked state by engaging the latch, and a latch that is pivotally supported by the base plate and is in a locked state. And a driving plate that presses in the locking direction. In addition, the driving plate is disposed opposite to the pole together with the latch, and the latch and the driving plate rotate integrally around the same axis.

  When an excessive load is applied to the driving plate in a direction in which the striker in a locked state is retracted from the recess of the base plate, the driving plate is deformed in preference to other parts and other members of the driving plate. It is preferable to provide a deformation promoting portion that is promoted. The “excessive load” in the present invention is a relative standard, exceeding a load assumed in a normal use state (a load that can generally act), and a latch, a pole, or a driving plate is It means a load that can be deformed.

  In addition, an engagement surface that engages with the latch is formed on a surface of the pole facing the latch, and a surface that engages with the engagement surface of the pole in the latch at an angle different from the engagement surface. A driving surface can be formed. As a result, the engagement surface and the driving surface having different angles engage with each other, whereby the latch is further pressed in the locking direction via the driving plate pressed by the pole. In this case, it is preferable that the thickness of the pole is made equal to the total thickness of the latch and the driving plate after the latch and the driving plate are stacked in the thickness direction. That is, both the latch and the driving plate rotate in the same plane as the rotation surface of the pole. In addition, the “thickness is the same” in the present invention is not the completely same meaning but the meaning of “substantially the same” including a deviation of about dimensional error.

  In the present invention, since the driving plate is disposed opposite to the pole together with the latch, the latch and the driving plate are rotated about the same axis, so the number of parts (particularly the number of supporting shafts) is small and the apparatus is compact. Is possible. Further, since the latch and the driving plate are integrally rotated, the configuration can be further simplified. Therefore, two urging members that constantly urge the latches, poles, and the like in a predetermined direction are not necessarily required, and a configuration having one urging member may be employed.

  If the drive-in plate is provided with a deformation promoting portion, even if an excessive load is applied in a direction to retract the locked striker from the recess of the base plate, the deformation promoting portion takes precedence over other parts and members. Therefore, it is possible to avoid problems such as deformation of unexpected parts and members resulting in malfunction and failure to lock the striker.

  By adopting a configuration in which the latch is further pressed in the locking direction by the engagement between the engaging surface provided on the pole and the driving surface provided on the driving plate, the device can be further downsized. Specifically, even if the latch and the driving plate are overlapped in the thickness direction and the poles are arranged at the opposed positions, it is not necessary to configure the pole and the driving plate to overlap. Therefore, since the thickness of the pole is made equal to the total thickness of the latch and the driving plate, not only the latch but also the driving plate can be rotated in the same plane as the pole, so that the apparatus can be thinned.

It is a side view of a retractable rear seat for vehicles. It is a block diagram of the locking device in a locked state. It is the sectional view on the AA line of FIG. It is a block diagram of the locking device in the unlocked state. It is a block diagram of the locking device in the lock initial state.

  Hereinafter, representative examples of the locking device according to the present invention will be described with reference to the drawings as appropriate. However, the present invention is not limited thereto, and various modifications can be made without departing from the gist of the present invention. is there. The application target of the lock device according to the present invention is not particularly limited as long as it is a member that needs to be locked and held by the striker and the lock mechanism, but typically, a storage seat for a vehicle that is detachable from the vehicle body is used. Applicable to vehicles equipped. Below, the case where the locking device according to the present invention is applied to such a vehicle will be described as an example.

(Example)
The storage seat is a rear seat that can be displaced between a use posture locked to the vehicle body side and a storage posture released from the vehicle body side after being unlocked. In the use posture locked on the floor side, the retractable seat operates the reclining device to tilt the seat back toward the seat cushion side (see FIG. 1). In parallel with this, by releasing the lock of the lock mechanism that joins the lower portion of the seat cushion and the floor side, the displacement operation to the retracted posture becomes possible. The stowed posture is a posture in which the seat cushion is rotated with the front side end as a fulcrum, and the whole is leaned against the back of the front seat, or in a retracted recess recessed in the rear floor with the rear side end as a fulcrum. There are postures stored in

  For example, when the storage seat 1 is rotated with its front side end as a fulcrum and leans against the back of the front seat, the front end of the cushion frame 11 in the seat cushion 10 of the storage seat 1 is shown in FIG. The part is connected to a hinge bracket 14 fixed to the floor 13 by a rotating shaft 15. Reference numeral 12 denotes a seat back. The locking device 2 is configured to be able to lock and unlock the storage seat 1 between the rear side lower portion of the cushion frame 11 and the floor 13 side. The lock device 2 is broadly divided into a lock mechanism 20 provided at the lower rear side (seat side) of the cushion frame 11 and a striker 3 fixed to the floor 13 (vehicle body side). In addition, the connection part by the rotating shaft 15 and the locking device 2 are disposed on both sides of the storage sheet 1.

  As shown in FIG. 2, the lock mechanism 20 includes a base plate 21 having a recess 30 that can receive the striker 3, a latch 22 that forms a lock state in which the striker 3 is sandwiched between the recess 30 of the base plate 21, A pawl 23 that holds the lock 22 in a locked state; a driving plate 24 that presses the latch 22 in the locked state in the lock direction; and a tension spring 25 that applies a biasing force to the pole 23 and the like.

  The base plate 21 is fixed to the lower part on the rear side of the cushion frame 11 with screws 35. The base plate 21 is provided with a concave portion 30 opened downward at a lower portion thereof. The recess 30 can receive the striker 3 from its open side (lower side), and is expanded downward to facilitate the reception. In addition, as shown in FIG. 3, the base plate 21 is a set of two pieces, and is assembled in a state where the latch 22, the pole 23, the driving plate 24, and the like are sandwiched between the base plates 21 and 21.

  The latch 22 is pivotally supported with respect to the base plate 21 by a support shaft 27. The latch 22 includes a hook portion 22a that opens to the side thereof. The latch 22 has a lock posture shown in FIG. 2 in which the hook portion 22a is engaged with the striker 3 received in the concave portion 30, and a lock release posture shown in FIG. 5 in which the engagement between the hook portion 22a and the striker 3 is released. The support shaft 27 is rotated about the rotation center. The limit of rotation of the latch 22 in the unlocking direction is regulated by a stopper 21 a formed integrally with the base plate 21. In the locked state in which the hook portion 22 a is engaged with the striker 3, the striker 3 is sandwiched between the hook portion 22 a and the recess 30 of the base plate 21. In addition, the latch 22 includes a locking surface 22b that is curved in a concave shape on the upper side edge (the side edge facing the pole 23) of the hook portion 22a, and moves leftward (in a direction away from the pole 23) from the locking surface 22b. An engagement protrusion 22c is provided at a distant location. As shown in FIG. 3, the engagement protrusion 22 c is integrally formed so as to protrude to the other side surface by pressing from one side surface of the latch 22. On the top of the latch 22, a spring hook portion 22d extends upward.

  As shown in FIGS. 2 and 3, the drive-in plate 24 is arranged in a state of being overlapped with the latch 22 in the thickness direction, and a pole 23 is arranged at a position opposite to the latch 22 and the drive-in plate 24. . As with the latch 22, the driving plate 24 is pivotally supported by the support shaft 27 so as to be rotatable with respect to the base plate 21. That is, the latch 22 and the driving plate 24 rotate about the same support shaft 27 as a rotation center. Further, an engagement hole 24 a penetrating in the thickness direction is formed above the support shaft 27. Since the engagement protrusion 22c of the latch 22 is fitted in the engagement hole 24a, the latch 22 and the driving plate 24 rotate integrally. Further, on one side edge of the driving plate 24 (side edge facing the pole 23), a driving surface 24b curved in a concave shape is formed. The driving surface 24b protrudes toward the pole 23 side than the locking surface 22b of the latch 22, and can engage with the latch 22 in preference to the locking surface 22b in a normal locked state. Further, a notch hole 24c is formed between the engagement hole 24a and the driving surface 24b so as to follow the curved shape of the driving surface 24b. As a result, the mechanical strength of the portion between the driving surface 24b and the cutout hole 24c is reduced, and when this portion is subjected to a large load on the lock mechanism 20, the other portions and other members are prioritized. The deformation promoting portion 24d is deformed.

  The pole 23 is pivotally supported with respect to the base plate 21 by a support shaft 28 at a position facing the latch 22 and the driving plate 24. The pole 23 includes a locking surface 23a that is curved in a convex shape on the side edge facing the latch 22 and the like. As shown well in FIG. 3, the thickness of the pole 23 is substantially the same as the total thickness of the latch 22 and the driving plate 24. Thus, the locking surface 23 a is configured to be able to engage with the driving surface 24 b of the driving plate 24 and the locking surface 22 b of the latch 22 that overlap in the thickness direction. Returning to FIG. 2, a spring hook 23 b extends upward at the top of the pole 23. A tension spring 25 is hooked between the spring hook portion 22 d of the latch 22 and the spring hook portion 23 b of the pole 23. The tension spring 25 constantly urges the latch 22 in the unlocking direction (counterclockwise direction in FIG. 2), and the pole 23 approaches the latch 22 and the driving plate 24 (clockwise direction in FIG. 2). ) Is always energized. In other words, the lock mechanism 20 of the present embodiment has a configuration in which only one spring is provided as a biasing means for constantly biasing the latch 22 in the unlocking direction and for constantly biasing the pole 23 in the locking direction. Yes.

  The pole 23 rotates integrally with a support shaft 28 that is the center of rotation of the pole 23, and a release lever that releases the lock state of the lock mechanism 20 outside the base plate 21 is provided at the end of the support shaft 28. (Not shown) are connected. An operation cable is connected to the release lever, and when the operation cable is pulled by a lock release operation, the release lever and the support shaft 28 are rotated, and accordingly, the pole 23 is also integrally rotated. become.

  In addition, as shown in FIG. 2, the locking surface 23a of the pole 23 and the locking surface 22b of the latch 22 are inclined at the same angle, and each pivot center of the pole 23 (the axis of the support shaft 28). It is formed as a concentric circular arc surface centering on. On the other hand, the arc center of the driving surface 24b of the driving plate 24 is at a position different from the arc center of the locking surface 23a of the pole 23, and there is an inclination angle difference of a predetermined angle θ with the locking surface 23a.

  Next, the operation of the lock device 2, that is, the lock / release mechanism of the striker 3 by the lock mechanism 20 will be described. First, when the storage sheet 1 is in the retracted position detached from the floor 13, the striker 3 is not in the recess 30 of the base plate 21, and the lock mechanism 20 is in the unlocked state as shown in FIG. Specifically, the latch 22 is biased in the unlocking direction (counterclockwise direction on the basis of the drawing) by the tension spring 25. At this time, since the latch 22 is engaged with the stopper 21a of the base plate 21, the limit of rotation of the latch 22 in the unlocking direction is restricted. At the same time, the driving plate 24 that rotates integrally with the latch 22 is also urged in the same direction as the latch 22. In the unlocked state, the driving plate 24 is below the locking surface 23a of the pole 23, and the latch 22 is also unlocked by the engagement of the driving surface 24b of the driving plate 24 with the base 23c of the pole 23. The rotation limit in the direction is regulated. At this time, the pole 23 is biased by the tension spring 25 in a direction to engage with the latch 22 (clockwise direction with reference to the drawing), but the engagement between the base 23c of the pole 23 and the driving surface 24b of the driving plate 24 is performed. Alternatively, the rotation of the pole 23 in the urging direction is restricted by the engagement between the lower surface of the pole 23 and the upper surface of the driving plate 24.

  Then, the storage seat 1 in the storage posture is moved to the use posture and the seat cushion 10 is set on the floor 13 as shown in FIG. 1, so that the striker 3 fixed to the floor 13 is recessed in the base plate 21. And the lock mechanism 20 is locked. Specifically, when the striker 3 is received in the concave portion 30 of the base plate 21, the hook portion 22a of the latch 22 is pushed up against the urging force of the tension spring 25, and the latch 22 is supported as shown in FIG. It rotates about the shaft 27 in the locking direction (clockwise with reference to the drawing). At this time, the drive-in plate 24 also rotates together with the latch 22 in the same direction around the support shaft 27, so that the rotation restriction of the pole 23 is released. Then, the pole 23 is rotated clockwise around the support shaft 28 by the urging force of the tension spring 25, and the locking surface 23a of the pole 23 and the driving surface 24b of the driving plate 24 are engaged. Thereby, the rotation of the latch 22 in the unlocking direction is restricted, and the locked state in which the striker 3 is held between the base plate 21 and the latch 22 is maintained.

  From the initial locked state shown in FIG. 5, the pawl 23 is further rotated clockwise by the urging force of the tension spring 25 to the locked state shown in FIG. At this time, the pawl 23 rotates while its locking surface 23a slides on the driving surface 24b of the driving plate 24. The inclination angle between the locking surface 23a and the driving surface 24b is a predetermined angle θ. Due to the angular difference, the latch 22 is further pressed in the locking direction via the driving plate 24 as the pole 23 rotates. Thereby, the play between the striker 3 and the latch 22 in the locked state is absorbed, and backlashing is performed.

  In this normal locked state, the locking surface 23 a of the pole 23 is engaged with the driving surface 24 b of the driving plate 24, but is separated from the locking surface 22 b of the latch 22. In other words, in the normal locked state, the latch 22 is not directly locked and held by the pole 23, but is locked via the driving plate 24 that is stacked on the latch 22 in the thickness direction and rotates integrally therewith. Has been. However, the thickness of the pole 23 is substantially the same as the total thickness of the latch 22 and the driving plate 24, and both the latch 22 and the driving plate 24 rotate on the same plane as the rotation surface of the pole 23. Yes. Therefore, the locking surface 23 a of the pole 23 is also in a positional relationship that can engage with the locking surface 22 b of the latch 22.

  In addition, in a normal locked state, a load may be applied in a direction in which the striker 3 retracts from the recess 30 of the base plate 21 due to a load applied to the storage sheet 1. Even in this case, normally, the latch 22 does not rotate in the unlocking direction due to the engagement between the driving surface 24 b of the driving plate 24 and the locking surface 23 a of the pole 23. However, when an excessive load is applied than is generally assumed, each member may be deformed. Therefore, the driving promotion plate 24 is provided with a deformation promoting portion 24d, and when an excessive load is applied, the deformation promoting portion 24d of the driving plate 24 is preferentially deformed with respect to other parts and other members. As a result, the locking surface 23 a of the pole 23 is engaged with the locking surface 22 b of the latch 22. At this time, since the locking surface 22b of the latch 22 has the same concentric shape as the locking surface 23a of the pole 23, the locking surfaces 22b and 23a are securely engaged with each other. When the unlocking operation is performed from the locked state shown in FIG. 2, the flow is the reverse of the above.

(Modification)
Since the latch 22 and the driving plate 24 rotate integrally, one end of the tension spring 25 may be hooked on either the latch 22 or the driving plate 24. That is, in the above embodiment, the tension spring 25 is hung between the latch 22 and the pole 23, but it can also be hung between the driving plate 24 and the pole 23.

  In addition, two springs can be provided as a biasing means for constantly biasing the pole 23 and the like. That is, it is possible to provide a first spring that constantly biases the pole 23 in the locking direction and a second spring that always biases the latch 22 and the driving plate 24 in the unlocking direction (the driving direction). In this case, the same tension spring as that in the above embodiment can be used, or a torsion coil spring wound around the support shafts 27 and 28 can be used.

DESCRIPTION OF SYMBOLS 1 Storage seat 2 Locking device 3 Striker 10 Seat cushion 13 Floor 20 Lock mechanism 21 Base plate 22 Latch 22a Hook part 22b Engagement surface 22c Engagement protrusion 23 Pole 23a Engagement surface 24 Drive-in plate 24b Drive-in surface 24d Deformation promotion part 25 Tension spring 27/28 Support shaft 30 Recess

Claims (3)

The striker is provided on one of the two members locked to each other, and the lock mechanism is provided on the other of the two members. The lock mechanism includes a base plate having a recess capable of receiving the striker, and the base plate. A latch that is pivotally supported and forms a locked state in which the striker is sandwiched between the recess of the base plate, and is pivotally supported by the base plate at a position opposed to the latch, and the latch engagement A locking device comprising: a pole that holds the latch in a locked state; and a driving plate that is pivotally supported by the base plate and presses the latch in the locked state in the locking direction,
The driving plate is disposed opposite to the pole;
The locking device according to claim 1, wherein the latch and the driving plate rotate integrally around the same axis.   When an excessive load is applied to the driving plate in a direction in which the striker in a locked state is retracted from the recess of the base plate, the driving plate is deformed in preference to other parts and other members of the driving plate. The locking device according to claim 1, comprising a deformation promoting portion that is promoted. An engagement surface that engages with the latch is formed on a surface of the pole facing the latch, and a surface that engages with the engagement surface of the pole in the latch at an angle different from the engagement surface. A driving surface is formed, and by engaging the engaging surface and the driving surface with different angles, the latch is further pressed in the locking direction via the driving plate pressed by the pole,
The latch and the driving plate are arranged in a state of being stacked in the thickness direction,
3. The locking device according to claim 1, wherein a thickness of the pole is equal to a thickness obtained by adding a thickness of the latch and a thickness of the driving plate.

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