JPH0345887Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention reduces the load applied to a seat belt anchor attached to a seat cushion that is movable relative to the vehicle body or seat mounting base member.
The present invention relates to a seat belt load bearing structure that effectively transmits the load to a seat mounting base member or a vehicle body.

[Conventional technology and its problems]

2. Description of the Related Art Seat belts for rear seats of automobiles are configured to be used by connecting a pair of left and right belts that wrap around the waist or lower abdomen of an occupant at the front of the occupant's body. In addition, in rear seats of general passenger cars that are fixed to the floor member etc. and cannot be moved forward or backward, the seat belt anchor that fixes the base end of the seat belt is attached to the seat cushion and seat back. The seat belt is configured to be fixed to the floor member after passing through the gap. In this case, in the unlikely event of an emergency, the tensile load applied to the seat belt is directly supported by the floor member, effectively preventing the occupant from being thrown forward.

By the way, in wagon-type 7- or 8-seater passenger cars, which have recently been actively developed, one of the two sets of rear seats, front and rear, can be rotated so that these rear seats can face each other. . The seat belt anchor for such a seat cannot be fixed to a floor member or a seat mounting base as in the case of the above-mentioned normal fixed seat. This is because it is necessary to attach a seatbelt anchor to the seat itself in order to be able to effectively wear a seatbelt in both the forward-facing and rearward-facing states of the rotary seat.

Further, such seats usually have a seat track interposed between the seat mounting base and the seat cushion so as to adjust the position of the seat in the longitudinal direction. When a seatbelt anchor is attached to a seat cushion that can move relative to the vehicle body or seat mounting base, the enormous tensile load that is applied to the seatbelt in an emergency is caused by the seat structure such as the seat cushion frame or seat track. Since it will ultimately be supported by the seat mounting base through the seat member, in order to prevent these components from breaking and the occupant being thrown forward, the seat component parts leading to the seat or the seat mounting base must be supported. In particular, it becomes necessary to make the seat track far more robust than is necessary to support the weight of a normal seat and occupant. However, setting the strength of the members interposed between the seat and the seat mounting base in anticipation of emergencies has the problem of increasing material costs and significantly increasing the weight of the vehicle.

For example, as shown in Japanese Utility Model Application Publication No. 77624/1983, a seatbelt anchor for a seatbelt can be used in an emergency to prevent the seat from attaching to a seat mounting base such as a floor member. Some of them are designed to intertwine. This device fastens the end of the seatbelt near the pivot of the engaging arm, which is rotatably attached to the side of the seat cushion with a certain amount of resistance. When a strong tensile load is applied, the engaging arm rotates overcoming the resistance, and the engaging claw at the tip thereof engages with a lock pin fixedly provided on the seat mounting base. In other words, in this conventional example, the tensile force of the seatbelt is supported by the seat cushion during normal times, while in an emergency, the enormous tensile load applied to the seatbelt is supported by the seat mounting base via the engaging arm. The maximum load that a seatbelt should be able to support in an emergency is made to comply with safety standards without unnecessarily increasing the strength of the seat itself or the members interposed between the seat and the seat mounting base.

However, even with the above conventional example, since a huge load is supported through the engaging arm, the engaging arm and the structure for pivoting it must have considerable strength. Therefore, these engaging arms and their supporting structures have had to increase in size and weight. In addition, the load of the seat belt can only be transmitted to the seat mounting base after the engaging arm rotates as specified, so if for some reason the rotation of the engaging arm is delayed, the seat cushion may be torn off from the seat mounting base. This makes it impossible to avoid the occupants jumping forward.

[Purpose of invention]

This idea was devised under the above circumstances, and its purpose was to avoid the enormous load that would be applied in an emergency to the seat belt anchor provided on the seat itself, which can move relative to the seat mounting base. To provide a load bearing structure for a seat belt which can be reliably supported on a seat mounting base by an extremely simple structure, without causing an increase in weight, and at low cost.

[Means to achieve the purpose]

In order to achieve the above object, the present invention takes the following technical measures.

That is, the present invention provides a seat in which the seat is movable in the longitudinal direction relative to the vehicle body by interposing a seat track between the seat mounting base and the seat cushion frame. At the rear thereof, a support piece extending downward is fixed, and
A locking piece is fixed to the rear part of this support piece, and a seat belt anchor is fixed to the front part of the support piece, and the locking piece is held on the seat mounting base, and the trajectory of the seat track of the locking piece is fixed to the seat mounting base. A holding member capable of allowing relative movement in the direction is fixed to the holding member, and further, when the supporting piece is pulled by the seat belt and attempts to move relative to the seat mounting base upward, the holding member is fixed to the holding member. It is characterized by providing an engaging hole into which the locking piece can be inserted and engaged.

[Functions and effects of the invention]

When the seat cushion frame is at the reference position, that is, at the rearmost position with respect to the seat mounting base, the holding members overlap each other so as to hold the locking pieces. The holding member and the locking piece are designed to allow relative movement in the direction of the seat track's trajectory, so the seat cushion frame can move the seat track's trajectory back and forth with respect to the seat mounting base. Can be moved. When the seat cushion frame is at the reference position as described above, the holding member and the locking piece cannot move in the vertical direction, so the seat cushion frame is lifted upward by the load from the seat belt. Even if a force is applied, this force is effectively supported by the seat mounting base due to the engagement between the holding member and the locking piece, and a situation where the occupant is thrown forward along with the seat can be avoided. effectively avoided.

Furthermore, in the present invention, the holding member is provided with a locking hole into which the locking piece can protrude and engage when the locking piece attempts to move in the vertical direction. The locking piece engages with the engagement hole and prevents the seat cushion frame from moving forward and backward relative to the seat mounting base, ensuring that the seat mounting base receives the enormous tensile load of the seatbelt. .

Moreover, in the present invention, in particular, a support piece extending downward is fixed to the rear part of the seat cushion frame, and the locking piece is attached to the rear part of the support piece.
Since the seatbelt anchors are attached to the front part, when a strong tensile load is applied to the seatbelt, the support piece deforms upward in the front direction, resulting in a rectangular shape when viewed from the side. Since the edge of the upper end of the piece-shaped locking piece tends to rise forward, this edge reliably engages with the engagement hole provided in the holding member. Therefore, even if the seat track longitudinal positioning mechanism is damaged, the forward movement of the seat cushion frame is more reliably prevented and safety is improved.

In this way, in the present invention, in an automobile seat in which a seatbelt anchor is attached to a seat cushion frame, an emergency mechanism is attached to an intermediate mechanism interposed between a seat mounting base such as a seat track and the seat cushion. Even if it does not have such strength, it can effectively prevent a situation where the occupant is thrown out along with the seat in an emergency. Moreover, in the present invention, a small locking piece is fixed to the seat cushion frame at an appropriate part of a supporting piece extending downward to fix the seatbelt anchor, and the above-mentioned locking piece is held on the seat mounting base. Since it has a simple structure in which a holding member is provided to hold the device, it is very advantageous in terms of cost and causes almost no increase in weight.

[Explanation of Examples]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the seat belt load bearing structure of the present invention will be specifically described below with reference to the drawings.

The seat 1 is movable in the longitudinal direction with respect to a seat mounting base 3 by means of a seat track 2. That is, an upper rail 6 is attached to the lower part of the seat cushion frame 4 via a suitable bracket 5, and this upper rail 6 is slidably engaged with a lower rail 7 attached to the upper surface of the seat mounting base 3 in the front and back direction. are doing. In addition,
This seat track 2 is provided with a locking mechanism for fixing the seat cushion frame 4 at a desired position within its range of forward and backward movement, but this is not an essential part of the present invention and is therefore omitted from illustration. It has been done. The illustrated seat 1 is a rotating seat in which the seat mounting base 3 is rotatable relative to the seat pedestal 8, but it has a fixed seat mounting base that is directly mounted to the floor 9. Of course, the present invention can also be applied to sheets.

Between the rear parts 4a' of the side frames 4a of the seat cushion frame 4 and the corresponding parts on the seat mounting base 3 when the seat cushion 4 is located at the rearmost position. is provided with load transfer means 10 capable of preventing upward movement of the seat cushion frame 4 relative to the seat mounting base 3.

Details of this load transmission means 10 are shown in FIG. 2 and below.

As shown in FIG. 2, the side frame 4a of the seat cushion frame has a support piece 12 formed by bending a plate member having a certain thickness.
The upper end portion is fixed by means such as welding, and the tip portion 12a thereof faces in parallel to the outside of the vertical side plate 11 provided on the seat mounting base 3 and extending in the front-rear direction. It extends like this. The base of a locking piece 13 having a substantially U-shaped cross section and having flanges 13a and 13b extending in the vertical direction is fixed to the inside of the tip 12a of the support piece 12 by welding or the like. In addition, the above-mentioned collars 13a, 13b
The edges are parallel to the direction of the trajectory of the seat track 2. In an emergency, this locking piece 13 engages with a holding member 14 (described later) to prevent the seat cushion frame 4 from being torn off from the seat mounting base 3, thereby ensuring the safety of the occupant restrained by the seat belt. Therefore, it is preferable to use a material with relatively high mechanical strength, such as high-tensile steel. Further, as clearly shown in FIG. 6, if a rib 15 is provided in the space forming the U-shaped portion of the locking piece 13, the upper and lower flanges 1
Since the collars 13a, 13b are strong against forces that try to compress them in the vertical direction, it is possible to increase the strength in an emergency when the collars 13a, 13b engage with a holding member to be described later, which is advantageous. In addition, the support piece 12
A seatbelt anchor 17 is fixed with a bolt 18 at a position shifted forward from the position where the locking piece 13 is fixed at the tip of the seatbelt anchor 17, and the end of the seatbelt 16 is fixed to this seatbelt anchor 17. It will be worn. On the other hand, seat mounting base 3
A holding member 14 having a substantially U-shaped cross section is fixed to the outer surface of the side wall 11 by welding or the like so as to hold the upper and lower flanges 13a, 13b of the locking piece 13. That is, this holding member 14 includes a back portion 14a that is in close contact with the outer surface of the side wall 11, and an upper collar 13a of the locking piece 13 extending from the upper and lower ends of the back portion 14a.
Upper and lower horizontal portions 14b, 14c extending outward through the upper part and the lower part of the lower collar 13b, respectively;
It has a basic cross-sectional shape including vertical portions 14d and 14e that extend vertically toward each other from the tips of these horizontal portions 14b and 14c.
Further, this holding member 14 is provided with an engagement hole 19 into which the engagement piece 13 can be inserted and engaged when the engagement piece 13 in the reference position attempts to move upward. In the case of this example, as clearly shown in FIG. 5, an engaging hole 19 into which the upper collar 13a of the locking piece 13 can fit is formed in the upper horizontal portion 14b. Note that, like the locking piece 13, this holding member 14 should also be made of a material with high mechanical strength.

The locking piece 13 and the holding member 14 do not interfere with each other as long as the seat cushion frame 4 moves back and forth along the trajectory of the seat track 2. However, when the seat cushion frame 4 is at the reference position located at the rearmost position in its longitudinally movable range, a strong tensile force is applied to the seat belt 16 in the direction of the arrow in FIG.
2 or the seat cushion frame 4 tries to move upwards, i.e. in FIG.
When the locking piece 13 exerts a strong upward force on the stationary holding member 14, the members interposed between the seat cushion frame and the seat mounting base 3, such as the seat track 2, The flange 13a of the locking piece 13 is distorted by the force, and as shown in FIG. It is reliably supported by the seat mounting base 3 via the holding member 14. Moreover,
In the present invention, in particular, the locking piece 13 and the seat belt anchor 17 are connected to a supporting piece 12 extending downward from the rear part of the seat cushion frame 4.
Furthermore, since the position of the seat belt anchor 17 is shifted forward from the position of the locking piece 13, when a strong tensile force is applied to the seat belt, the support piece 12 tends to rise forward. The upper edge of the locking piece 13, which is formed into a rectangular piece shape when viewed from the side, tends to rise forward, so that the front edge of the locking piece 13 reliably engages with the engaging hole 19. Therefore, even if the seat track 2 is distorted and its positioning locking mechanism loses its function, the seat cushion frame 4 will remain forward due to the reliable engagement between the locking piece 13 and the engagement hole 19 of the holding member. It never moves out of place.

As described above, in the seat belt load bearing structure according to the present invention, the weight of the seat and occupant and the tensile load of the seat belt under normal conditions are transferred to a structure such as a seat track that is interposed between the seat cushion frame and the seat mounting base. It is supported by the strength of the member itself, and in case of an emergency, a load transmission means with a large load capacity that is formed separately from the above-mentioned structural members is used to absorb the enormous force that would try to tear off the seat cushion frame. I try to accept it. Therefore, it is not necessary to make the members such as the seat track extremely strong in case of an emergency, which greatly contributes to reducing the weight of the vehicle and the cost of materials.
In addition, the load transmission means includes a small locking piece provided at a predetermined part of a support piece extending downward from the rear part of the seat cushion frame to fix the seat belt anchor, and a predetermined holding piece on the seat mounting base. Since it is an extremely simple structure that only requires the provision of members, it can be easily implemented and does not require much cost.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional side view of a seat to which the structure of the present invention is applied, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view for explaining the operation, and Fig. 4 is a support piece and a retaining member. FIG. 5 is a sectional view showing the holding member, and FIG. 6 is a detailed perspective view of the locking piece. 1...Seat, 2...Seat track, 3...
Seat mounting base, 4... Seat cushion frame, 13... Locking piece, 14... Holding member, 1
7...Seat belt anchor, 19...Hatching hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A seat in which the seat is movable in the longitudinal direction relative to the vehicle body by interposing a seat track between the seat mounting base and the seat cushion frame, the above-mentioned seat cushion frame. At the rear thereof, a support piece extending downward is fixed, and
A locking piece is fixed to the rear part of this support piece, and a seat belt anchor is fixed to the front part of the support piece, and the locking piece is held on the seat mounting base, and the trajectory of the seat track of the locking piece is fixed to the seat mounting base. A holding member capable of allowing relative movement in the direction is fixed to the holding member, and further, when the supporting piece is pulled by the seat belt and attempts to move relative to the seat mounting base upward, the holding member is fixed to the holding member. A load-bearing structure for a seat belt, characterized by having an engaging hole into which a locking piece can be inserted and engaged.