JP4047646B2 - Seat back locking device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat back locking device that can lock a retractable seat back in an upright state.
[0002]
[Prior art]
This type of locking device is provided with a latch plate and a locking plate. The latch plate engages with a striker on the vehicle body side when the seat back stands up and rotates, and the locking plate engages with the latch plate. Thus, the latch plate can be prevented from rotating. The seat back is used as a backrest of the seat by being locked in the standing state, and expands a storage space including a trunk room and the like by being tilted.
[0003]
As such a retractable seat back locking device, for example, as described in Japanese Patent Application Laid-Open No. 8-111010, a device equipped with a display mechanism capable of visually confirming the locked state of the seat back. is there. The locking device includes a display member (pin) that can be projected and retracted at a fixed position of the seat back, and the display member and the locking plate are connected by a connecting mechanism including a rod and a link. The display member appears and disappears in conjunction with the rotation of the plate. In other words, when the locking plate is rotated to prevent the latch plate engaged with the striker on the vehicle body side from standing up, that is, when the seat back is locked in the upright state, the locking plate is interlocked. Then, the display member is immersed in the seat back. On the other hand, when the locking plate is rotated to release the rotation prevention of the latch plate in order to release the engagement between the striker and the latch plate, the display member protrudes outward of the seat back in conjunction with the locking plate. Therefore, it is possible to confirm whether or not the seat back is locked in the standing state from the state where the display member appears and disappears.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional locking device, since the rotation angle of the locking plate is small, it has been difficult to set the amount of protrusion and depression of the display member sufficiently large. In addition, when the display member is protruding, that is, when the seat back is unlocked, the rotation of the locking plate is restrained by the latch plate, so that the protruding display member is forcibly pushed in the immersion direction. When this occurs, the rod in the coupling mechanism between the locking plate and the display member may be deformed such as buckling. When deformation such as buckling occurs, normal operation of the locking device may be hindered, and the seat back may not be unlocked.
[0005]
It is an object of the present invention to set a sufficiently large amount of the display member for confirming the seat back locked state, and to absorb the movement when the projecting display member is forcibly pushed in the immersion direction. An object of the present invention is to provide a seat back locking device that can prevent deformation such as buckling of components.
[0006]
[Means for Solving the Problems]
The seat back locking device of the present invention includes a latch plate that is mounted on a retractable seat back, a latch plate that meshes with a striker on the vehicle body side when the seat back is raised, and a latch plate that rotates. A locking device for a seat back comprising a locking plate that engages and prevents rotation of the latch plate, a display member provided to be able to protrude and immerse into a fixed position of the seat back, and the latch plate By rotating the latch plate connected to the display member, immersing the display member by rotating the latch plate in a direction to engage with the striker, and by rotating the latch plate in a direction to release the engagement with the striker. and a coupling mechanism to project the display member, wherein the connecting mechanism, attachable to the locking device main body The first link connected to the latch plate and the second link connected to the display member are each provided in a unit so as to be rotatable, and the first link is formed by the latch plate. The display member protrudes through the second link when rotating in a direction to release the engagement with the striker, and the second link when the latch plate rotates in a direction to engage with the striker. The display member is inserted through the second plate, and when the rotation of the latch plate engaged with the striker is prevented by the locking plate, the display member faces the second link with a predetermined clearance .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0008]
1 to 3, reference numeral 1 denotes a retractable seat back provided on a rear seat of the automobile, and 2 denotes a rear shelf. As shown in FIG. 2, the striker 3 is attached at a fixed position of the vehicle body, and the locking device 10 of the present embodiment is provided inside the seat back 1. When the seat back 1 is erected as shown in FIG. 1, the seat back 1 is locked in the erected state by the striker 3 and the lock device 10 as will be described later. By releasing the lock and tilting the seat back 1 as shown in FIG. 2, the trunk room 4 communicates with the interior of the vehicle through the trunk room opening 4 </ b> A, and the storage space of the trunk room 4 is expanded. Reference numeral 51 denotes a display pin (also referred to as an “indicator part”) as a display member that is removably provided at a fixed position of the seat back 1, and 52 is an operation handle provided in the trunk room 4. Is connected to the locking device 10 as will be described later.
[0009]
4 is a plan view when the locking device 10 is locked, FIG. 5 is a plan view when the locking device 10 is unlocked, and FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 4 and 5, the right side is the “rear” of the vehicle, and the left side is the “front” of the vehicle.
[0010]
In FIG. 6, reference numerals 21 and 22 denote a lower plate and an upper plate constituting the lock device main body 20, and a base plate 30 is attached to the lower side of the lock device main body 20. These plates 21, 22, 30 are coupled by bolts 23 and nuts 24.
[0011]
As shown in FIG. 4, between the upper and lower plates 21 and 22, a latch plate 13 that can rotate in the directions of arrows A1 and A2 around the pin 11 and a pin 12 that rotates in the directions of arrows B1 and B2 A locking mechanism comprising a possible locking plate 14 is provided. Locking portions 13A and 14A are formed at the opposing portions of the latch plate 13 and the locking plate 14, and a meshing portion 13B that meshes with the striker 3 is formed on the latch plate 13. Between the arm portion 13C of the latch plate 13 and the arm portion 14B of the locking plate 14, a tension spring 15 that urges the plates 13 and 14 in the arrow A1 direction and the arrow B1 direction is bridged. Further, the arm portion 14 </ b> B of the locking plate 14 is connected to the operation handle 52 (see FIG. 3) in the trunk room 4 via the rod 16.
[0012]
The base plate 30 includes a connecting mechanism for causing the display pin 51 to appear and retract in conjunction with the rotation of the latch plate 13.
[0013]
In other words, a first link 32 that is rotatable about the pin 31 in the directions of arrows C1 and C2 is attached to the flat plate portion 30A of the base plate 30. The arm portion 32A of the first link 32 and the arm portion 13D of the latch plate 13 are connected by a rod 33, and between the former arm portion 32A and the fixed position of the flat plate portion 30A of the base plate 30, a first position is provided. A tension spring 34 (biasing means) that urges the one link 32 in the direction of the arrow C1 is stretched over. Reference numeral 35 denotes a pin implanted in the first link 32.
[0014]
Further, as shown in FIGS. 7 and 8, a second link 47 is attached to the bent portion 30 </ b> B of the base plate 30. The second link 47 is rotatable about the pin 46 in the directions of arrows D <b> 1 and D <b> 2. The right side in FIG. 8 is “rear” of the vehicle, and the left side is “front” of the vehicle. The second link 47 is urged in the direction of the arrow D2 by the torsion spring 48, and the rotation limit position in the direction of the arrow D2 is such that the first arm portion 47A is a stopper of the bent portion 30B as shown in FIG. It is regulated by coming into contact with 30C. The second arm portion 47B of the second link 47 faces the pin 35 of the first link 32 with a predetermined clearance ΔL (see FIG. 4), and the first link 32 rotates in the direction of the arrow C1 as shown in FIG. By moving, the pin 35 comes into contact with the second arm portion 47B, and the second link 47 is rotated in the arrow D1 direction against the spring 48 as shown in FIG. Further, as shown in FIG. 4, the first link 32 rotates in the direction of the arrow C <b> 2, so that the pin 35 is separated from the second arm portion 47 </ b> B, and the second link 47 is moved by the biasing force of the spring 48 as shown in FIG. 8. Return in the direction of arrow D2. The third arm portion 47 </ b> C of the second link 47 is connected to the display pin 51 via the rod 49.
[0015]
Next, the operation will be described.
When the seat back 1 stands up as shown in FIG. 1 and the locking device 10 locks the striker 3 as shown in FIG. 4, the latch plate 13 moves in the direction of the arrow A <b> 2 where the engaging portion 13 </ b> B meshes with the striker 3. The locking plate 14 is in the rotated position, and the locking plate 14 is in the rotated position in which the locking portion 14A rotates in the direction of the arrow B1 that locks the locking portion 13A of the latch plate 13. The rotation in the direction of arrow A1 is prevented. In such a locked state of the seat back 1, the first link 32 rotates in the direction of the arrow C2 as shown in FIG. 4, and the second link 47 rotates in the direction of the arrow D2 as shown in FIG. Therefore, the display pin 51 moves in the direction of the arrow E2 as shown in FIGS. Thus, it can be confirmed that the seat back 1 is locked in the standing position by the display pin 51 being immersed in the back seat 1.
[0016]
When unlocking the seat back 1, the operation handle 52 in the trunk room 4 is pulled and the locking plate 14 is rotated in the direction of the arrow B2 to unlock the latch plate 13. As a result, the latch plate 13 is quickly rotated in the direction of the arrow A1 by the urging force of the spring 15 and the urging force of the spring 34, immediately releases the engagement with the striker 3, and positively opens the striker 3. . Therefore, the seat back 1 can be brought down as shown in FIG. Further, the striker 3 can be actively released simultaneously with the release of the latch plate 13 by the locking plate 14 by utilizing the biasing force of the spring 34 provided in the coupling mechanism in this way, so that the seat back 1 can be removed. Operability when defeating is improved. Then, as the latch plate 13 is rotated in the direction of the arrow A1, the first link 32 is rotated in the direction of the arrow C1 as shown in FIG. 5, which is rotated in the direction of the arrow C1 by the clearance ΔL (see FIG. 4) or more. From the time of movement, the second link 47 rotates in the direction of arrow D1 as shown in FIG. As a result, the display pin 51 moves in the direction of the arrow E1 as shown in FIGS. 2 and 7 and protrudes outward from the seat back 1.
[0017]
Therefore, it can be confirmed that the seat back 1 is unlocked by such protrusion of the display pin 51. If the locking by the locking device 10 is incomplete in the state where the seat back 1 is raised, the display pin 51 protrudes outward from the seat back 1 as shown in FIG. The lock of the back 1 can be prompted. In addition, the clearance ΔL in FIG. 4 can absorb the variation in dimensions between the locking mechanism on the locking device body 20 side and the coupling mechanism on the base plate 30 side, and the display pin 51 can be operated more reliably. it can.
[0018]
Thereafter, when the seat back 1 is locked again in the standing position, the seat back 1 is raised and the striker 3 is relatively moved into the locking device 10. The striker 3 rotates the latch plate 13 in the direction of the arrow A2 against the springs 15 and 34 while meshing with the meshing portion 13B of the latch plate 13. Then, after the locking portion 13A of the latch plate 13 exceeds the locking portion 14A of the locking plate 14, the locking plate 14 is rotated in the direction of the arrow B1 by the urging force of the spring 15, and the locking device is again shown in FIG. The locked state is as shown in FIG. As a result, as described above, the display pin 51 moves in the direction of the arrow E2 as shown in FIGS.
[0019]
By the way, if an external force is applied to the projecting display pin 51 as shown in FIG. 7 and it is forcibly pushed in the immersion direction, the second link 47 rotates in the direction of the arrow D2, the first Since the rotation of the link 32 in the direction of arrow C2 and the rotation of the latch plate 13 in the direction of arrow A2 are allowed, an excessive force is not applied to the rod 49. Therefore, deformation such as buckling of the rod 49 in the coupling mechanism can be avoided.
[0020]
In addition, since the connecting mechanism that causes the display pin 51 to appear and retract in conjunction with the rotation of the latch plate 13 is integrated into the base plate 30 and the connecting mechanism is unitized, the base plate 30 is retrofitted to the lock device body 20. be able to. Therefore, the workability of attaching the lock confirmation display member is improved. Further, the display pin 51 may be combined to unitize the coupling mechanism. Further, the amount of protrusion of the display pin 51 can be adjusted by changing a part of the link ratio or the like in the coupling mechanism integrated on the base plate 30. For this reason, in the locking device for each vehicle type in which the protruding amount of the display pin 51 is different, it is possible to share the parts constituting the coupling mechanism. In addition, when the base plate 30 is retrofitted to the lock device main body 20, variation in dimensions between the lock mechanism on the lock device main body 20 side and the coupling mechanism on the base plate 30 side due to the clearance ΔL in FIG. 4, and the lock device main body Since it is possible to absorb variations in mounting between the base plate 30 and the base plate 30, the display pin 51 can be operated more reliably.
[0021]
In addition, the form and the deployment position of the display pin 51 are arbitrary.
[0022]
【The invention's effect】
In the seat back locking device of the present invention, the display member provided to be able to appear and retract at a fixed position of the seat back and the latch plate are connected by a connecting mechanism, and the display member is moved in and out in conjunction with the rotation of the latch plate. Compared with the conventional case in which the display member is raised and lowered according to the rotation of the locking plate having a relatively small rotation angle, the amount of display and protrusion of the display member is adjusted according to the rotation of the latch plate having a relatively large rotation angle. It can be set sufficiently large. Therefore, the locked state of the seat back can be confirmed more reliably by the display member having a large amount of protrusion and depression. Furthermore, when the display member is protruding, that is, when the seat back is unlocked, the latch plate is allowed to rotate, so when the protruding display member is forcibly pushed in the immersion direction, The movement of the display member is absorbed with the rotation of the latch plate, and deformation such as buckling of the components of the coupling mechanism can be prevented.
[0023]
Further, the connecting mechanism can be provided as a unit on the base plate, and the base plate can be retrofitted to the apparatus main body. As a result, the workability of attaching the display member for lock confirmation can be improved.
[0024]
In addition, the connecting mechanism connects the latch plate and the display member with a predetermined clearance, so that the dimensional variation between the locking mechanism on the locking device body side and the connecting mechanism on the base plate side, and the device body and the base plate The display member can be more reliably operated by absorbing the variation in the attachment of the, thereby improving safety.
[0025]
In addition, by providing a biasing means for biasing the latch plate in the direction to release the engagement with the striker in the coupling mechanism, the striker is released simultaneously with the release of the latch plate by the locking plate, and the seat back is tilted down. The operability at the time can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a seat back provided with a locking device of the present invention when standing.
FIG. 2 is a perspective view when the seat back of FIG. 1 is tilted.
FIG. 3 is a rear view when the seat back of FIG. 1 is in an upright state where the seat back is not locked;
4 is a plan view of the locking device of FIG. 1 during a locking operation. FIG.
5 is a plan view of the locking device of FIG. 1 when unlocked. FIG.
6 is a cross-sectional view taken along line VI-VI in FIG.
7 is a cross-sectional view taken along line VII-VII in FIG.
8 is a view similar to FIG. 7 during the locking operation of the locking device of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seat back 2 Rear shelf 3 Strike 4 Trunk room 10 Locking device 13 Latch plate 14 Locking plate 20 Locking device main body 30 Base plate 32 First link 33 Rod 34 Spring (biasing means)
47 Second link 49 Rod 51 Display pin (display member)

Claims (4)

A locking device mounted on a retractable seat back, a latch plate that engages and rotates with a striker on the vehicle body side when the seat back stands, and a latch plate that engages with the latch plate and rotates. In a locking device for a seat back comprising a locking plate capable of preventing
A display member provided so as to protrude and immerse in a fixed position of the seat back;
The latch plate is connected between the latch plate and the display member, and in which the display member is immersed by the rotation of the latch plate in the direction of meshing with the striker and the meshing with the striker is released. a coupling mechanism to project the display member by the rotation of,
With
The coupling mechanism includes a base plate that can be attached to the lock device main body, a first link coupled to the latch plate, and a second link coupled to the display member so as to be rotatable. And
The first link causes the display member to protrude through the second link when the latch plate rotates in a direction to release engagement with the striker, and the latch plate engages with the striker. The display member is immersed through the second link when rotating to the second link, and the second link has a predetermined clearance when rotation of the latch plate engaged with the striker is prevented by the locking plate. A seat back locking device characterized by facing . 2. The seat back locking device according to claim 1, wherein the coupling mechanism includes a spring that biases the second link in a direction in which the display member is retracted . 3. The seat back locking device according to claim 1 , wherein the coupling mechanism includes a stopper that restricts a rotation limit position of the second link in a direction in which the display member is retracted .   4. The seat back locking device according to claim 1, wherein the coupling mechanism includes a biasing unit that biases the latch plate in a direction of releasing the meshing with the striker. 5.

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