JPH1148842A - Impact-absorbing-type seat rail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a damage to an occupant with a simple structure at a rear-end collision and to prevent the occupant from being free from restraint. SOLUTION: A seat rail 5 has a fixing rail 12 having a plurality of retaining holes 11 in the longitudinal direction, a movable rail 13 slid back and forth by the fixed rail 12, an operating lever 14 rotatably supported by the movable rail 13, a lock claw 15 fixed to the operating lever 14, and holding parts 16a, 16b for positioning the lock claw 15 to a seat 1 in the longitudinal direction. The seat 1 is locked by operating the operating lever 14 to retain the lock claw 15 by the any of the retaining holes 11. An easily compressible cushioning material 19 is arranged between the lock claw 15 and the holding part 16 before it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a seat rail for protecting an occupant by absorbing an impact received during a rear-end collision.

[0002]

2. Description of the Related Art FIG. 3 shows a schematic structure of an automobile seat. As shown, the seat (1) is fixed to a seat rail (5) via a seat rail mounting bracket (4), and the seat rail (5) is body-mounted via a seat mounting bracket (6). Is fixed to the floor (7).

FIG. 5 shows an example of a conventional seat rail (5). The seat rail (5) is obtained by attaching a seat (1) to an upper rail (13) slidable along a lower rail (12). A lever (14) is supported. A lock claw (15) is attached to the operation lever (14), and this lock claw (15) is attached to the upper rail (13).
Are positioned and held in the front-rear direction with respect to the sheet (1) by a pair of front and rear holding portions (16a) (16b) attached to the seat (1). Lock holes (11) are provided at a plurality of locations in the front-rear direction on the side surface of the lower rail (12), and the lock claws (15) are formed so as to be insertable and removable from the lock holes (11). .

In this type of seat rail (5), when the locking claw (15) is released from the locking hole (11), the seat (1) is slidable in the front-back direction, and the operation lever (14) is moved. The seat (1) can be locked in the front-rear direction when the lock claw (15) is engaged with one of the locking holes (11) by rotating in the direction of the arrow.

[0005]

As described above, in the conventional seat rail, when the locking claw (15) is engaged with the locking hole (11), the seat (1) is locked, and the seat (1) is locked. It is in a state of being rigidly connected to the floor (7). Therefore,
At the time of a rear-end collision, as shown in FIG. 4, the impact acts directly on the human body via the route of 〜, and the occupant may be damaged. As a means of reducing such damage, there is a seat described in Japanese Utility Model Laid-Open No. 59-186157. This is because the seat back is tilted backward at the time of a collision and the seat cushion is slid forward. A complicated operation of absorbing a shock with a damper is performed, and the structure becomes considerably complicated.

Even if such a solution is not taken, in general, when the impact at the time of a rear-end collision is large, the components of the seat are deformed and absorb the impact, so that the damage to the occupant can be reduced. However, in this case, the deformation of the component parts may cause a change in behavior such as the inclination of the seat, and the restraint on the human body may be impaired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a seat mounting structure that can reduce the damage to an occupant during a rear-end collision with a simple structure and that does not impair the restraint of the occupant.

[0008]

In order to achieve the above object,
The shock-absorbing seat rail according to the present invention includes a fixed rail fixed to the floor of a vehicle body and provided with locking holes at a plurality of positions in the front-rear direction, a movable rail slidably guided back and forth by the fixed rail, and a movable rail. A movable-side member having an attached sheet, an operation lever supported by the movable-side member, a lock claw fixed to the operation lever and capable of being inserted into and removed from the locking hole; And a holding portion for positioning and holding in the direction, and locking the sheet by operating the operation lever to engage the lock claw with any of the plurality of locking holes.
A cushioning material is interposed between the lock claw and a holding portion located in front of the lock claw.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view of a seat rail (5) according to the present invention, and FIG. 2 is a longitudinal sectional view in the front-rear direction. In both figures, the left side of the figures is the front of the vehicle body, and the right side is the rear of the vehicle body.

The seat rail (5) has a lower rail (12: fixed rail) provided with locking holes (11: only a part is shown) at a plurality of positions in the front-rear direction on the side surface thereof, and a lower rail (12). An upper rail (13: movable rail) that slides back and forth by 12), an operating lever (14) that extends along the front and rear of the vehicle body and is supported by the upper rail (13), and fixed to the operating lever (14) And locking holes (11)
A lock claw (15) formed to be insertable into and removable from a pair of holding portions (16) for positioning and holding the lock claw (15) in the front-rear direction.
a) (16b), and the upper rail (1
3) is fixed to the lower surface of the seat cushion (1a) of the seat (1), and the lower rail (12) is fixed to the floor of the vehicle body to be interposed between the seat (1) and the floor.

The operating lever (14) is connected to the upper rail (1).
3), is rotatably supported by the pair of holding portions (16a) (16b), and is always in the direction of the arrow in the drawing, ie, the lock claw (15) by a spring (not shown). It is urged in the circumferential direction to engage with the locking hole (11). Rotate the operating lever (14) in the direction opposite to the arrow in the figure against the urging force of the spring, and move the locking claw (15) out of the locking hole (11) to the seat (1) in the front-rear direction. When an external force is applied, the seat (1) can be slid in the front-rear direction, the operating lever (14) is released, and the locking claw (15) is engaged with one of the locking holes (11) by the biasing force of the spring. If they are combined, the position of the seat (1) can be locked.

The holding portions (16a) and (16b) are attached to the upper rail (13) as described above, and can be any one of the movable members (17: sliding with respect to the lower rail) including the seat (1). (A moving member). The holding portions (16a) and (16b) may be formed as separate members as shown in FIG. 1 or FIG. 2, or may be integrated as in the conventional product shown in FIG.

Between the lock claw (15) and the holding portion (16a) located forward of this, a cushioning material (19: indicated by scattered points in FIG. 1) is interposed. This cushioning material (19) is formed, for example, in a cylindrical shape having an inner diameter larger than the outer diameter of the operation lever (14), and by inserting the operation lever (14) into the inner diameter hole, the lock claw (15) and the front side are locked. Holding part (16a)
And placed between. At this time, the length of the cushioning material (19) in the axial direction is such that the front end face of the cushioning material (19) is pressed against the front holding part (16a) and the rear side end face and the rear holding part ( 16b) and the position of the lock claw (15), specifically, the relative position in the front-rear direction with respect to the seat (1) is held (positioned). This cushioning material (19) can normally hold the lock claw (15) in the above-mentioned specified position, but is formed so as to have a rigidity enough to be easily compressed and collapsed by an impact at the time of a rear-end collision. . Such a low-rigidity cushioning material (19) can be formed by reducing the wall thickness, forming a large number of through holes in the outer peripheral surface, or using other materials such as a lock claw (15) or a lower rail (12) as a molding material. It can be realized by means such as using a material having lower rigidity than the member.

In the above configuration, at the time of a collision, the floor moves forward, and accordingly, the lower rail (12) and the lock claw (15) also move forward. However, since the seat (1) tends to remain at the original position due to the inertia of the occupant, a force in the compression direction is applied to the cushioning material (19). If the cushioning material (19) is crushed by the compression force at this time, the shock at the time of the rear-end collision is absorbed by the cushioning material (19), and the damage to the occupant can be reduced. Also, at this time, the seat (1) moves horizontally relative to the floor, so that the restraint of the occupant is not impaired.

The relative retreat amount (stroke amount) of the seat (1) at the time of a collision can be controlled by appropriately changing the shape, size, material, etc. of the cushioning material (19). It is possible to easily obtain the amount of shock absorption suitable for the intended use. FIGS. 1 and 2 illustrate a case where the operation lever (14) is inserted into the inner diameter portion of the cushioning material (19). However, the cushioning material (19) includes the lock claw (15) and the front holding portion (16a). ) May be interposed between the lock claw (15) and the holding portion (16).
The operation lever (14) itself may be made of a cushioning material in a region between the operation lever (a).

[0017]

According to the present invention, since the cushioning material is interposed between the lock claw and the holding portion located in front of the lock claw,
The impact at the time of a rear-end collision can be absorbed by a simple structure, and the damage to the occupant can be reduced. Also,
After the collision, the seat moves substantially horizontally, so that the restraint of the occupant is not impaired.

[Brief description of the drawings]

FIG. 1 is a perspective view of a shock absorbing seat rail according to the present invention.

FIG. 2 is a vertical cross-sectional view of a surface along a central axis of an operation lever of the seat rail.

FIG. 3 is a schematic side view showing a general mounting structure of a conventional seat.

FIG. 4 is a diagram illustrating a transmission sequence of an impact at the time of a rear-end collision.

FIG. 5 is a perspective view of a conventional seat rail.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Seat 5 Seat rail 7 Floor 11 Lock hole 12 Fixed rail (lower rail) 13 Movable rail (upper rail) 14 Operation lever 15 Lock claw 16 ⁰¹ 16b Holder 17 Movable member 19 Buffer material

Claims (1)

[Claims] 1. A fixed rail fixed to a floor of a vehicle body and provided with locking holes at a plurality of positions in a front-rear direction, a movable rail slidably guided back and forth by the fixed rail, and a seat attached to the movable rail. A movable member,
An operating lever supported by the movable member, a lock claw fixed to the operation lever and removably inserted into the locking hole, and a holding portion for positioning and holding the lock claw in the front-rear direction with respect to the sheet. A seat is locked by operating the operation lever to engage the lock claw with any of a plurality of locking holes. A cushioning material is provided between the lock claw and a holding portion located in front of the lock claw. Shock absorbing seat rail interposed.