JPH0511713Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention prevents the upper rail from separating from the lower rail even in an emergency such as a collision.
This invention relates to a seat slide device for automobiles, etc.

[Prior art]

2. Description of the Related Art A seat slide device for an automobile or the like includes a lower rail fixed to the floor of the vehicle, and an upper rail fixed to the seat below the side surface of the seat and slidably incorporated into the lower rail. Such seat slide devices are provided on both sides of the seat.

In the seat slide device, as shown in FIG.
It is disposed between the upper rails 114 and receives vertical forces acting on the upper rails. Further, the steel ball 122 is held between an inward bent edge 128 at the lower end of the upper rail and an outer bent edge 124 at the upper end of the lower rail, and receives vertical and lateral forces acting on the upper rail. In such a configuration, the upper rail 114
can easily slide in the longitudinal direction of the lower rail 112 without causing play in the vertical and horizontal directions.

Further, a large number of locking tabs (not shown) are provided on the upper rail 114 at regular intervals, and a large number of locking holes (not shown) are formed on the lower rail 112, spaced apart from each other at regular intervals. Then, with the locking tab removed from the locking hole, insert the upper rail 114 into the lower rail 1.
After the upper rail is slid to the desired position on the lower rail, the locking tab is inserted into the locking hole and locked, and the upper rail is locked in the desired position on the lower rail.

In such a seat slide device, if the seat belt is not fastened, the maximum load will be applied between the upper rail and the lower rail when the seated person falls backwards and is pressed against the seat back in an emergency such as a collision. do. Then, an upward tensile force acts on the joint between the front end of the seat on the upper rail and the upper rail, and a downward compressive force is generated at the joint between the rear end of the seat and the upper rail. In particular, this tensile force is
As shown by the arrow in Fig. 12, the upper rail 1
14 and separates the front end of the upper rail from the lower rail 112. However, since the tensile force is not so large, the seat slide device can sufficiently withstand it without any problems.

[Problems with conventional technology]

However, when wearing a seat belt becomes mandatory, conventional seat slide devices are not strong enough.

In other words, when a seated person seated on a seat on the top rail fastens their seat belt, the maximum load will be applied to the seated person in the event of an emergency such as a collision, resisting the inertial force that would cause the seated person to jump forward. When held on the seat, it acts on the seat sliding device. In this case, a downward compressive force acts as a load on the joint between the front end of the seat on the upper rail and the upper rail, and an upward tensile force acts on the joint between the rear end of the seat and the upper rail. In particular, the latter load (tensile force) is much larger than the load (tensile force) that acts on the joint between the front end of the seat and the upper rail when the seat belt is not worn.
Then, due to this load, the upper rail is strongly lifted upward, and as shown in Fig. 13,
The bent edges 128 and 124 of the upper and lower rails that hold the steel ball 122 are deformed. Therefore, there is a risk that the upper rail 114 may separate from the lower rail 112. here,
If the upper rail 114 is
Needless to say, if the vehicle leaves the vehicle, the seated occupant will fly forward along with the upper rail and seat, causing a disaster.

By enlarging the effective cross section of the upper rail and lower rail or by forming the upper rail and lower rail from thick steel plates, the strength is reinforced and deformation of the upper rail and lower rail is prevented, so that detachment of the upper rail can be sufficiently prevented.

However, increasing the effective cross section increases the size of the seat slide device, requires a large installation space, and increases weight, which is not preferable. Also,
Even if the upper rail and lower rail are formed from a thick steel plate, this is also undesirable as it increases the weight.

[Purpose of invention]

The purpose of this invention is to provide a seat slide device that is reinforced in strength and prevents the upper rail from separating from the lower rail without increasing the size or weight.

[Summary of the idea]

To achieve this purpose, according to this invention,
A large number of tabs are provided on the inwardly bent edge of the upper edge of the lower rail, spaced apart from each other for a certain period of time. Further, a large number of locking pieces that can be bent by providing slits in the upper rail are formed on the upper rail opposite to the claws. Then, when the upper rail is lifted relative to the lower rail, the locking piece is easily bent and broken by being brought into contact with the claw and being pushed. Here, when the tab presses the locking piece and bends it, it is preferable that the tab has a recess into which the distal end surface of the locking piece locks.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a seat slide device 10 according to the present invention includes a lower rail 12 fixed to a floor surface 11, and an upper rail 14 loaded with seats (not shown) and slidably incorporated into the lower rail. It is equipped with and configured. The upper rail 14 is formed integrally with the seat frame 16 (see FIG. 2) or separately (see FIG. 3).
If formed separately from the seat frame 16, the base piece 18 of the upper rail is bolted to the seat frame 16 using the through hole 19, for example. A bent piece 20 is welded to the base piece 18 of the upper rail 14, and the base piece and the bent piece extend downward symmetrically. The upper rail 14 has a base piece 18,
It is composed of a bent piece 20, as shown in FIG.
The base piece and the bent piece are each formed with an outwardly bent edge 24 at the lower end that holds the steel ball 22 between the base piece and the lower rail 12. On the other hand, the lower rail 12 is usually formed by bending a single steel plate, and has a holding part 26 in the middle for holding the steel ball 22, and an inwardly bent edge 28 formed at the upper end. . For example, two steel balls 22 are provided on each side. The vertical force acting between the upper rail 14 and the lower rail 12 is mainly caused by rollers (not shown) disposed between the upper rail and the lower rail.
The steel balls 22 mainly support the horizontal force between the upper rail and the lower rail. Due to the presence of these rollers and steel balls 22, the upper rail 1
4 can slide smoothly on the lower rail without any rattling vertically or horizontally.

In the embodiment, the lower rail 12 is disposed so as to wrap around the upper rail 14, and a large number of claws 30 are protruded from the lower rail 12 at a certain distance from each other (see FIGS. 1 to 4). usually,
The pawls 30 are formed at the same pitch as the lock holes (not shown). As can be clearly seen from FIG. 5, the corresponding locking piece 32 is attached to the upper rail 14
Many holes are drilled in. The locking pieces 32 are formed so as to be spaced apart from each other by the same distance as the claws 30, and are formed in a shape that can be easily bent and pierced by contacting and being pressed by the claws. In the embodiment, as shown in FIGS. 5 and 6, the locking piece 32
is formed into a rectangular shape with a connecting side 34 on one part and slits 36 on the other three sides.
Here, at both ends of the slit 36, as shown in the figure,
If a small-diameter hole 38 is provided, the locking piece 32 can be attached to the claw 30.
When the upper rail 1 is bent by the pressure of
4. It can be bent smoothly without any cracks.
In addition, a lockable recess 4 on the distal end surface 32a of the locking piece is also provided.
0 is preferably provided at the bent edge 28 of the lower rail.

As described above, in the seat slide device 10 provided with the claw 30 and the locking piece 32, an upward load (tensile force) F as shown by the arrow due to a collision or the like is applied.
Assume that it acts on the upper rail 14 (see Fig. 7). Then, the upper rail 14 is lifted upward, but when the locking piece 32 comes into contact with the claw 30 and is pressed, the claw bends the locking piece and breaks through it. Then, when the load continues to be applied and the upper rail is lifted, the claw 30 begins to bend. However, since the leading edge 32a of the locking piece is located adjacent to the claw 30, the leading edge of the locking piece immediately bites into the claw and prevents the claw from bending. Here, the greater the load F acting on the upper rail 14, the stronger the engagement of the locking piece 32 becomes, and the locking piece 32 can sufficiently withstand high loads. Therefore,
Subsequent lifting of the upper rail 14 and bending of the claw 30 are prevented, and separation of the upper rail from the lower rail 12 is sufficiently prevented.

Furthermore, in the above configuration, if the load is large, the engagement of the locking piece 32 into the claw 30 becomes stronger, and a structure with greater strength against deformation is obtained. Therefore, the upper rail and lower rail do not need to have a large effective cross section, and can be formed from thin steel plates. Therefore, the seat slide device 10 has sufficient strength despite being small and lightweight.
is obtained.

In particular, if the claw 30 is provided with a recess 40 as shown in the figure, the locking piece 32 will be reliably engaged with the claw 30 and strong bite will be obtained.

The locking piece 32 is not limited to the illustrated shape, as long as it can be easily bent and broken when it comes into contact with the claw 30 and is pressed. For example, slits may be formed on all four sides (see Figure 9), or other shapes other than rectangular, such as
It may also be a trapezoid (see Figure 10). Furthermore, the first
As shown in FIG. 1, if the locking piece 32 is slightly bent in advance, even when the load F acts diagonally upward, the locking piece and the claw will surely engage, and the locking piece 32 Engagement occurs quickly.

Note that the seat slide device is provided on both sides of the seat as shown in FIG.
0. It is not necessary to arrange the seat slide device 10 of this invention in which the notch pieces 32 are formed on both sides. In other words, the seat slide device 1 of this invention
0 may be disposed on either the left or right side, and a conventional seat slide device may be disposed on the remaining side. However, it goes without saying that if the seat slide device 10 of this invention is arranged on both sides of the seat, separation of the upper rail from the lower rail can be more reliably prevented.

The above-described embodiment is intended to explain the present invention, and does not limit the present invention in any way. It goes without saying that all modifications, alterations, etc. made within the technical scope of the present invention are also included in the present invention.

[Effect of idea]

As described above, according to the seat slide device of this invention, when an upward tensile force (load) is applied to the upper rail due to a collision or the like and the upper rail is lifted, the claw provided on the lower rail is moved against the upper rail. The upper rail and lower rail are engaged by bending and breaking through the provided locking piece. When the load continues to be applied, the pawl begins to bend, but the leading edge of the locking piece immediately bites into the pawl and prevents the pawl from bending.
The greater the load acting on the upper rail, the stronger the bite of this locking piece becomes.
Can withstand high loads. Therefore, subsequent lifting of the upper rail and bending of the claws are prevented. Therefore, even if a high load is applied due to a collision or the like, causing the upper rail to separate from the lower rail, the seat slide device can withstand this load sufficiently.
The separation of the upper rail from the lower rail is reliably prevented.

In addition, since the combination of the claw and the locking piece provides a structure with high strength against deformation, the upper rail and lower rail do not need to have a large effective cross section, and can be formed from thin steel plates. Therefore, a seat slide device that is small, lightweight, and has sufficient strength can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the seat slide device according to this invention, Fig. 2 is an exploded perspective view of the seat slide device formed integrally with the seat frame, and Fig. 3 is a cross-sectional view of the seat slide device formed separately from the seat frame. 4 is a perspective view of the lower rail seen from behind, FIG. 5 is a partial perspective view of the upper rail, and FIG. 6 is an enlarged view of the slit formed in the upper rail. 7 and 8 are cross-sectional views of the seat slide device before and after applying a load, FIGS. 9 and 10 are enlarged views of a locking piece according to a modification, and FIG. 11 is a cross-sectional view of the locking piece. Cross-sectional view of the seat sliding device slightly bent in advance, 12th
13 are cross-sectional views of a conventional seat slide device before and after a load is applied. DESCRIPTION OF SYMBOLS 10... Seat slide device, 12... Lower rail, 14... Upper rail, 16... Seat frame, 22... Steel ball, 24... Outer bent edge of upper rail, 28... Inner bent edge of lower rail, 30 ...Tlaw, 32...Latching piece,
34... Connecting side, 36... Slit, 38...
Hole, 40... recess, 42... opening.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) It is equipped with a lower rail fixed to the floor surface and an upper rail that is slidably incorporated into the lower rail on which seats are loaded, and the claws are separated from each other for a certain period of time and are mounted on the lower rail. A large number of locking pieces protrude from the inwardly bent edge of the edge and are bendable through slits provided in the upper rail, and are formed on the upper rail opposite to the claws, so that the upper rail is lifted relative to the lower rail. A seat slide device in which the locking piece comes into contact with the claw and is pushed through. (2) The pawl of the lower rail has a recess in which the tip of the locking piece is locked when the locking piece comes into contact with the pawl and is pushed and broken through. Claim No. (1) Seat sliding device as described in section.