JPH0732290Y2 - Folding seat locking device with seat belt - Google Patents

Description

[Detailed description of the device] [Industrial applications]

This invention can be folded and stored by rotating the front seat leg forward as a fulcrum,
In addition, in the case of a folding seat with a seat belt, the rear part of the seat can be securely fixed to the floor panel when the seat is used, and the strong load from the seat belt is transmitted to the floor panel without burdening the seat. It relates to the improvement of what is made possible.

[Prior art]

In some one-box vehicles, a front folding type seat is used as the rear seat, and when the rear seat is folded, the rear part of the vehicle compartment can be widely used as a luggage compartment. Further, such a foldable seat is provided with a lock device including a seat side lock mechanism having a hook and a floor side striker with which the hook engages, and when the seat is used, the rear part of the seat is locked by the lock mechanism. It is configured to be fixed to the floor. By the way, even in such a foldable seat, setting of the seat belt is obligatory, and in this case, it is a problem to surely support the load acting on the seat belt on the floor in an emergency. For example, Japanese Utility Model Laid-Open No. 63-32043 discloses a structure in which a seat belt anchor is connected to a seat lock mechanism fixed to a rear seat leg, and a load from the seat belt is transmitted from the lock mechanism to the floor. .

[Problems to be solved by the device]

In the configuration disclosed in the above publication, it is possible to transmit a strong tensile force acting on the seat belt in an emergency or the like to the floor without imposing a great burden on the seat constituent member. However, the configuration shown in this publication has the following problems to be solved. That is, in the above-described conventional configuration, although the lock mechanism and the seatbelt anchor are connected, the connection simply fixes the bracket member supporting the hook in the lock mechanism and the seatbelt anchor by overlapping. I am doing it. More specifically, the base plate of the bracket member of the lock mechanism and the seat belt anchor plate are overlapped with each other, and these are fastened and fixed by screws. Then, the strong pulling force from the seat belt is transmitted to the floor via many members such as seat belt anchor plate → screw → base plate of bracket member → bracket member → hook support pin → hook → striker. In this case, it is necessary to give strength to withstand the maximum tensile force supported by the seatbelt to all of the members that take up the path and the connecting members thereof, and as a result, the locking device is relatively bulky and heavy. It has to be big. As described above, the seat belt anchor plate is fixed to the base plate of the bracket member of the lock mechanism by simply screwing it so that the screw receives only one shearing force in the axial direction. Not only is it necessary to increase the cross-sectional area of the screw, but in order to deal with twisting and bending of the screw, the plate thickness of the member through which this screw is inserted must be increased, and the above locking device is becoming larger and larger. And it becomes heavy. Although it is intended to ensure safety, the increase in size and weight of the locking device as described above runs counter to the demands of the times. Incidentally, in the past, other than the locking device for the folding seat with the seat belt described above, for example, an actual opening
Some of them are listed in the 61-177952 publication. As shown in FIG. 2 of the publication, this conventional one is one in which an anchor bolt is inserted through a lock base provided with a lock ratchet, but an anchor plate (seat belt) to which a seat belt is connected. The anchor plate) has a structure connected to one end of an anchor bolt protruding from one side surface of the lock base. Therefore, in such a structure, the anchor bolt has a structure similar to that of a so-called cantilever beam, and when a tensile force acts on the seat belt anchor plate, a force that causes twisting of the anchor bolt acts. Become. Such twisting of the anchor bolt causes so-called play in the seat belt pulling direction, which impedes smooth transmission of force to the striker, and therefore must be eliminated. Therefore, in order to eliminate the twist, it is necessary to increase the overall thickness of the lock base for supporting the anchor bolt, and like the conventional one described above,
There has been a problem that the lock device as a whole is increased in size and weight. The present invention has been devised under such circumstances, and when a large tensile force is generated on the seat belt, the predetermined supporting member is not twisted and the tensile force is simple. The object is to make it possible to properly support the structure and to reduce the size and weight of the entire locking device.

[Means for Solving the Problems]

In order to solve the above problems, the present invention takes the following technical means. That is, according to the invention of the present application, a support pin projects from the rear portion of the seat that can be folded and rotated forward with the front seat leg as a fulcrum, and the support pin is engaged with the seatbelt anchor plate and the striker on the floor. And a hook for supporting the seat belt anchor plate are rotatably supported by inserting the support holes provided in the hook and the seat belt anchor plate, respectively. A sub plate having the same axial center as the support hole and having a support hole to be inserted into the support pin is welded, and one member welded to the sub plate and the sub plate are the shafts of the support pins. On the line, the sub-plate is adjacent to both sides of the other member which is not welded, and is disposed so as to sandwich both sides of the other member. It is set to.

[Action]

In the invention of the present application, the seatbelt anchor plate and the hook of the lock mechanism are rotatably supported by the support pin projecting at the rear portion of the seat, thereby being substantially connected. According to the present invention, a strong tensile load from the seat belt is applied to the seat belt anchor plate → support pin →
It is transmitted to the floor via the route of hook → striker. As described above, according to the configuration of the present invention, the number of members for transmitting the tensile force of the seat belt to the floor is much smaller than the conventional member, and the weight of the lock mechanism can be reduced accordingly. As described above, this is because, in the conventional locking device, the seat belt tension plate → screw → base plate of bracket member → bracket member → hook support pin → hook → striker pulls the seat belt through many members. It is clear when compared with what was transmitted. Further, in the present invention, a seat belt anchor plate connected by being rotatably inserted into the support pin and a sub plate inserted into the support pin are provided on one of the hooks, and the sub plate and the sub plate are installed on the support pin. A unique structure is adopted in which the main body is arranged so as to be adjacent to both sides of the other member so as to sandwich the both sides. As a result, there are two places where shearing occurs on the axis of the support pin.
This is a point, and theoretically, it is sufficient in strength to set the cross-sectional area of the support pin to half that of the conventional screw. This also greatly contributes to the weight reduction of the lock device. In addition, the support pin is not twisted, and it is not necessary to increase the length of the support hole of the member through which the support pin is inserted to cope with this. This means that the hook or the seatbelt anchor plate has a minimum plate thickness considering only the tensile strength, which also greatly contributes to the weight reduction of the locking device.

[Effect of device]

As described above, the folding device for a folding seat with a seat belt according to the invention of the present application has a capability of bearing a load from a seat belt which is comparable to that of the conventional device, and can be remarkably made smaller and lighter than the conventional device. .

[Explanation of Examples]

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. The present invention is premised on a folding seat 1 with a seat belt as shown in FIG. The lower end of the front seat leg 3 that hangs down from the front portion of the lower surface of the seat cushion 2 is connected to the floor F so as to be rotatable in the front-rear direction, while the rear seat leg 4 stands up against the rear portion of the lower surface of the seat cushion 2. In order to select a state or a state in which the seat cushion 2 is folded on the lower surface, it is possible to turn up and down. The lock mechanism 7 attached to the rear seat leg 4 and the striker 6 provided on the floor F constitute a lock device 7. When the seat cushion 2 is tilted toward the floor with the front seat leg as the center of rotation while the rear seat leg 4 is upright, the hook 8 of the lock mechanism 5 is pulled.
Automatically engages the striker 6 and is locked in that state. When the lock is released, the rear seat leg 4 is folded, the seat back is folded on the seat cushion 2, and the seat cushion 2 is rotated forward with the front seat leg 4 as a rotation center.
Is folded and stored, for example, behind the front seat. Details of the lock mechanism 5, which is the main part of the present invention, are shown in FIGS. 1 to 4. A bracket 9 made of sheet metal is fixed to an appropriate portion of the rear seat leg 4 by welding. The bracket 9 has a leg portion 10 for substantially contacting the floor F to support the weight of the occupant on the seat on the floor, and a mounting wall 11 facing rearward. A cushion rubber 12 is attached to the bottom surface of the leg portion 10 with a screw 13. A support pin 14 protruding rearward is fixed to the mounting wall 11 of the bracket 9. In this example, the screw portion of the support pin 14 having the head flange portion, the shaft portion, and the tip screw portion is screwed into the screw hole formed in the mounting wall 11. In the present invention, the seat pin anchor plate 15 and the hook 8 are rotatably supported by the support pin 14. The seatbelt anchor plate 15 has an upper portion to which a seatbelt assembly 16 is fastened and fixed, and a lower portion to which an upper support pin is attached.
A plate-like member having a support hole 17 through which the support hole 17 can be inserted.
Is rotatably supported with respect to the support pin 14 by being inserted into the support pin 14. However, in the present example, the seat belt anchor plate 15 is restricted in its rotation by a pair of stopper pieces 9a and 9b provided on the bracket 9 at both side edges thereof. On the other hand, the hook 8 is a plate-shaped member having a hook portion 18 in the lower portion, and has a support hole 19 into which the support pin 14 can be inserted, in the upper portion. Further, as well shown in FIGS. 1 and 4, a sub plate 21 having a support hole 20 having the same axis as the support hole 19 and through which the support pin 14 can be inserted is formed in the upper portion. The lower part is welded to the hook body. The hook 8 is bent in a crank shape in the middle when viewed from the front, and the hook 8 and the upper portion of the sub plate 21 are positioned so as to be separated from each other by a dimension substantially equal to the thickness of the seat belt anchor plate 15. It is configured. Then, as shown in FIG. 1, the supporting holes 17, 19, 20 of each member are fitted to the supporting pin 14 so that the hook 8 and the upper portion of the sub-plate 21 are positioned with the seat belt anchor plate 15 interposed therebetween. Is inserted. A lock release lever 22 is welded and fixed to the hook 8 as shown in FIG.
Is always urged in the locking direction (arrow L direction) by a tension coil spring 23 interposed between the lock release lever 22 and the bracket 9. The outer surface of the hook portion 18 of the hook 8 is formed with a slant surface portion 24 that guides the hook 8 in the unlocking direction while coming into contact with the striker 6 while approaching it. The hook 8 is automatically engaged with the striker 6 by being tilted toward the state. When the lock is released, the occupant operates the lock release lever 22 to rotate the hook 8 in the lock release direction to release the engagement with the striker 6. In the above configuration, when a strong tensile force acts on the seat belt in an emergency or the like, this tensile force is transmitted to the striker 6 via the seat belt anchor plate 15, the support pin 14, and the hook 8. In this way, since the tensile load is transmitted straight to the striker 6, almost no external force acts on the bracket 9 supporting the support pin 14 or the rear seat leg 4 due to the strong tensile force acting on the seat belt in this emergency. . This means that it is sufficient to give the seat leg 4 or the bracket 9 sufficient strength to support a normal occupant load. The sub-plate 21 is welded to the hook 8, and the sub-plate 21 and the hook main body are located on the support pin 14 so as to sandwich the seat belt anchor plate 15. The shearing force acts on two points in the axial direction, and the strength of the support pin 14 is substantially doubled. Since the support pin 14 is supported on the hook 8 in a two-sided manner during load application, the support pin 14 does not get twisted or strong bending stress concentrates on the base of the support pin 14. Thus, the plate thickness of the seat belt anchor plate 15 and the hook 8 can be set to the minimum plate thickness in consideration of only the tensile strength that can withstand the tensile force transmitted from the seat belt in an emergency. As a result, the folding device for a folding seat with a seat belt according to the present invention can transmit the load transmitted from the seat belt to the floor with sufficient strength in an emergency, and at the same time, can be significantly reduced in weight and size. . And this greatly contributes to reduction of the vehicle weight. Of course, the scope of the present invention is not limited to the above embodiments. For example, in the embodiment, the sub-plate is provided on the hook, but conversely, if the sub-plate is provided on the seat belt anchor plate and the upper part of the hook is located between them, The same effect as can be expected. Further, although the locking device of the present invention, particularly the locking mechanism thereof, is provided on the foldable rear seat leg in the embodiment, the rear seat leg is not foldable, or the rear part of the seat cushion frame is not provided especially on the rear seat leg. It can be applied to the type that directly supports the floor without any problem. In short, the present invention is a lock device for locking the rear part of the seat that is folded by the forward rotation when the seat is in use, and can be configured at an appropriate part of the rear part of the seat.

[Brief description of drawings]

FIG. 1 is a view showing an essential part of an embodiment of the present invention, which is a view corresponding to a cross section taken along the line I-I of FIG. 2, FIG. 2 is a side view, and FIG. 3 is a direction III in FIG. FIG. 4 is a perspective view showing components in a disassembled state, and FIG. 5 is a side view of an example of a seat to which the present invention is applied. 1 ... Folding seat, 3 front seat legs, 5
…… Lock mechanism, 6 …… Strike, 7 …… Lock device, 8 …… Hook, 14 …… Support pin, 15 …… Seat belt anchor plate, 17 …… Support hole (for seat belt anchor plate), 19 ・ ・ ・… (Hook) support hole, 20 …… (Sub plate) support hole, 21 …… Sub plate, F …… Floor.

Front page continued (72) Inventor Atsushi Kutomi 2-4, Higashi 2-chome, Toyonan-cho, Toyonaka-shi, Osaka Within Fuji Seat Co., Ltd. (56) References: 61-177952 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A support pin projects from a rear portion of a seat which can be folded and rotated forward with a front seat leg as a fulcrum, and the support pin is engaged with a seat belt anchor plate and a striker on a floor. The hook and the seatbelt anchor plate are rotatably supported by inserting the support holes provided in the hook and the seatbelt anchor plate, respectively. A sub plate having the same axial center as the hole and having a support hole to be inserted into the support pin is welded, and one member welded to the sub plate and the sub plate are on the axis of the support pin. In, the sub-plate is adjacent to both sides of the other member is not welded is arranged so as to sandwich both sides of the other member, Toberuto with a folded sheet of the locking device.