JP2002120621A - Slider for seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent locking from being released by sinking in a front end part of an upper rail, even when powerful force toward a front side is applied in a seat. SOLUTION: This slider is provided with a lower rail 21 fixed to a floor and having a U-shaped cross-sectional view, the upper rail 26 fixed to the seat 1, engaged with the lower rail 21 to be moved longitudinally, and having a reversed U-shaped cross-sectional view, a locking mechanism 3 for locking the longitudinal motion of the upper rail 26, and a slide lever 7 for operating the locking by the locking mechanism 3 and the release of the locking. The slide lever 7 is projected from a front end opening of the upper rail 26 toward its front side, a projected protection piece 261 is provided in the upper rail 26 to be projected from its front end part toward its front side, and the projected piece 261 is dimensionally set to make its lower end part slide-contact with a bottom plate 22 of the lower rail 21 or to form a fine gap with respect to the bottom plate 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat slider improved so as to reliably maintain a locked state for restricting the longitudinal movement of a seat.

[0002]

2. Description of the Related Art Conventionally, a vehicle seat 100 as shown in FIG. 9 is known. As shown in FIG. 9A, the seat 100 has a seat bottom 110 which is a seated seat.
And a seat back 120, which is a backrest erected at the rear end of the seat bottom 110, and a slider 130 interposed between the seat back 120 and the floor F of the vehicle. At the rear of the seat bottom 110, a bracket 1 integrated with a frame (not shown) supporting the seat bottom is provided.
The seat back 120 is supported by the bracket 111 so as to be rotatable around a horizontal axis.

In the lower position of the bracket 111,
An anchor bolt 141 for fixing one end of the seat belt 140 is provided. The other end of the seat belt 140 is fixed to an upper portion of the side surface on the opposite side of the seat back 120.

The slider 130 has a U-shaped lower rail 131 extending in the front-rear direction (left-right direction on the paper surface of FIG. 9) fixed to the floor F, and a lower rail 1
An upper rail 132 having an inverted U-shape in cross-section that moves back and forth while being guided by 31; an operation lever 133 protruding forward from a front end surface of the upper rail 132;
A lock structure 134 is provided in the upper rail 132 and locks and unlocks the longitudinal movement of the upper rail 132 by operating the operation lever 133.

Then, as shown by a solid line in FIG. 9A, the operation lever 133 extends substantially horizontally (lock position).
While the lock structure 134 locks the upper rail 132 so as to prevent the front-rear movement in the state set as described above, the lock is operated by operating the operation lever 133 upward as shown by a two-dot chain line in FIG. The structure 134 unlocks the forward and backward movement of the upper rail 132 so that the seat 100 can be moved forward and backward. Therefore, in a state where the occupant is seated on the seat 100, the operation lever 133 is gripped and pulled up, and the seat bottom 110 is moved back and forth to perform positioning.
By returning 33 to the original position, the longitudinal movement of the seat 100 is locked.

[0006]

By the way, in the conventional slider 130 as described above, when the running vehicle suddenly stops or collides, the forward force F1 applied to the occupant loses the seat belt 140. The upper rail 132 is transmitted to the seat back 120 through the rear rail 132 and acts as a counterclockwise moment about the rear end point P of the upper rail 132, so that the front end of the upper rail 132 may sink into the lower rail 131.

When the front end of the upper rail 132 sinks into the lower rail 131, the operating lever 133 in contact with the lower rail 131 is moved to the upper rail 132.
Relative to the lock release position, the lock by the lock structure 134 may be released and the seat 100 may move forward.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and effectively releases the lock by sinking of the front end of the upper rail even when a large forward force is applied to the seat. It is an object of the present invention to provide a seat slider having a lock structure that can be blocked.

[0009]

According to the first aspect of the present invention,
A pair of widthwise lower rails fixed to the vehicle floor,
A seat slider comprising: a pair of upper rails fixed to a seat and moving back and forth while being fitted into the lower rails via a predetermined interposition member, wherein each of the upper rails is a vehicle body. And an immersion preventing member for preventing immersion of the upper rail into the lower rail by contacting a part of the lower rail.

According to the present invention, when a vehicle moving forward or backward suddenly stops or collides, the force applied to the seat causes the front end or the rear end of the upper rail to be supported by the rear end or the front end. Even if the upper rail is transmitted to the upper rail as a downward moment, the upper rail is provided with an immersion prevention member that prevents immersion into the lower rail by contacting a part of the vehicle body. Prevents the upper rail from sinking into the lower rail by interfering with a part of the vehicle body, thereby causing the inconvenience of unlocking the upper rail back and forth movement by the lock mechanism provided on the slider, for example. Is prevented.

Therefore, for example, when the vehicle is suddenly stopped, the locked state of the lock mechanism is released, and the inconvenience of the seat jumping forward is reliably prevented.

According to a second aspect of the present invention, in the first aspect of the invention, the immersion preventing member is provided so as to protrude forward from a front end of the upper rail, and a lower end slides on a bottom surface of the lower rail. It is characterized in that it is formed by a protective protruding piece which is dimensioned so as to be in contact with or to form a slight gap between itself and the bottom surface.

According to the present invention, when the running vehicle suddenly stops or collides, the forward force applied to the seat becomes a downwardly directed moment at the front end portion with the rear end portion of the upper rail as a fulcrum. At the front end of the upper rail, a protective protruding piece is provided at the front end of the upper rail so that the lower end slides on the bottom surface of the lower rail or a small gap is formed between the bottom surface and the bottom surface. As a result, the lower end of the protective projection abuts against the bottom surface of the lower rail, thereby preventing the front end of the upper rail from sinking into the lower rail. Is reliably prevented from being in a state where the lock by the lock mechanism is released by being operated relatively upward with respect to.

Therefore, when the vehicle is suddenly stopped or the like, the locking state of the lock mechanism is released by the upward movement of the operation rod with respect to the upper rail, and the inconvenience of the seat jumping forward is reliably prevented.

The third aspect of the present invention provides the first or second aspect.
In the invention described above, the immersion preventing member is fitted between the side walls of the rear end of the upper rail, and the lower end slides on the bottom surface of the lower rail or a slight gap is formed between the bottom surface and the bottom surface of the lower rail. It is characterized by being formed by spacers dimensioned in such a way.

According to the present invention, when the retreating vehicle suddenly stops or collides, the rearward force applied to the seat becomes a moment in which the rear end portion with the front end portion of the upper rail as a fulcrum is directed downward. Even if it is transmitted to the upper rail, the size of the inverted U-shaped gap at the rear end of the upper rail is such that the lower end slides on the bottom surface of the lower rail or a slight gap is formed between the bottom surface and the bottom surface of the lower rail. Since the set spacer is interposed, the lower end of the spacer abuts against the bottom surface of the lower rail, thereby preventing the front end of the upper rail from sinking into the lower rail,
An inconvenience such as unlocking of the lock mechanism caused by sinking of the lower rail is reliably prevented.

In addition, a large force is applied to the rear end of the upper rail due to a sudden stop of the running vehicle or the like, whereby deformation such that the side walls of the upper rail approach each other is reliably prevented by the presence of the spacer.

Further, by providing the spacer, it is not necessary to take measures to increase the thickness of the material of the upper rail, which contributes to reducing the material cost by preventing the deformation.

[0019]

FIG. 1 is a perspective view showing an embodiment of a seat to which a slider of the present invention is applied. As shown in FIG. 1, a seat 1 includes a seat bottom 11, a seat back 12 provided to be capable of tilting to a rear end of the seat bottom 11 and capable of maintaining an arbitrary tilting position. It comprises a pair of sliders 2 in the width direction for supporting the bottom 11 to be able to move back and forth.

The slider 2 includes a lower rail 21 fixed to the floor F, and an upper rail 26 that moves back and forth while being guided by the lower rail 21. The lower rail 21 is formed in a concave shape when viewed from the front, and has a bottom plate 22 that is long in the front-rear direction, a pair of width-direction side plates 23 erected from both sides of the bottom plate 22, and directions facing each other from each side plate 23. A pair of top plates 2 projecting in the width direction by a predetermined dimension
4 and a hanging plate 25 hanging downward by a predetermined size from the facing edge of each top plate 24.

The upper rail 26 is provided with an inverted U-shaped member 27 having an inverted U-shape in a front view, and protrudes upward from the lower edge of the inverted U-shaped member 27 in opposite directions. And a pair of wing members 28 in the width direction.
The inverted U-shaped member 27 has a width dimension of the hanging plate 2 of the lower rail 21.
The length of the lower rail 21 is set slightly shorter than the length of the lower rail 21, and the length of the lower rail 21 is set to be slightly shorter than the length of the lower rail 21. It can move back and forth within the range of the height.

The size and shape of the pair of wing members 28 are set so as to fit between the corresponding hanging plate 25 and the side plate 23. Then, each wing member 28 is fitted between the hanging plate 25 and the side plate 23 via a retainer 29 having a rotatable steel ball 29a exposed to the outside, thereby forming an upper rail 26 as shown in FIG. Are mounted on the lower rail 21 in such a manner that they can smoothly move back and forth. It should be noted that a roller can be employed instead of the steel ball 29a.

Since the upper rail 26 has a W-shape in cross-section when the inverted U-shaped member 27 and the pair of wing members 28 are combined, the slider 2 having the upper rail 26 is a W-shaped slider. It is commonly called.

Then, both ends of the slide lever 7 formed by bending the pipe into a U-shape are inserted into the upper rail 26 from the front end of the upper rail 26 and connected to the lock plate 4 described later. When the slide lever 7 is pulled up, the lock of the upper rail 26 with respect to the lower rail 21 is released.

On the top surface of the inverted U-shaped member 27 of each upper rail 26, side frames 13 each having an L-shape in cross section are fixed. Side frame 1
Reference numeral 3 denotes a horizontal plate 14 whose width is equal to the width of the upper rail 26 and whose length is slightly shorter than the length of the upper rail 26, and a vertical plate 15 erected from one side edge of the horizontal plate 14. And a fall prevention plate 16 extending in the front-rear direction and extending downward from the other side edge.

Each of the side frames 13 is mounted on the upper rail 26 by fixing the horizontal plate 14 to the top surface of the inverted U-shaped member 27 by screwing or the like in a state where the fall prevention plates 16 are opposed to each other. I have. And
A cushion pan 17 made of a metal plate is provided between a pair of horizontal plates 14 facing each other and fixed by screws or the like. Seat bottom 1 on this cushion pan 17
1 is supported and fixed.

An anchor shaft 15a is provided at a rear position of the vertical plate 15 of one side frame 13, and a seat belt 18 is stretched between the anchor shaft 15a and an opposite side surface of the seat back 12. Has been established. The occupant of the seat 1 wears the seat belt 18 in a state of crossing from the back to the abdomen while sitting on the seat bottom 11, so that the vehicle is prevented from jumping forward when the vehicle stops suddenly. Has become.

FIG. 2 shows the slider 2 and the lock mechanism 3.
FIG. 3 is an exploded perspective view showing one embodiment of the present invention, and FIG. 3 is a partially cutaway assembled perspective view thereof. Further, FIG.
FIG. 4 is a cross-sectional view taken along a line A. FIG. 5 is a view of a lock plate which is a component of the slide lever structure, and FIG.
Is a side view, and (b) is a plan view. In FIG. 5, the slide lever 7 is connected to the arrowhead projection 4 via the cylindrical spring 6.
3 is also shown.

First, at the front end of the upper rail 26, as shown in FIGS. 2 and 3, each of the side plates of the inverted U-shaped member 27 is extended downward to form a protection projection (an immersion prevention member). Member 261 is provided. The protection projection 261 is formed by extending each side plate directly downward without forming the wing member 28 over the front end portion 260 of the upper rail 26 over several cm in the front-rear direction.

As shown in FIG. 3, the protection projection 261 has a small gap formed between its lower end and the bottom plate 22 of the lower rail 21 when the upper rail 26 is mounted on the lower rail 21. The upper and lower dimensions are set so that the lower end thereof is in sliding contact with the bottom plate 22, so that even if a large downward force is applied to the lower end of the upper rail 26, the lower end of the protective projection 261 is moved to the lower rail 21. To prevent the upper rail 26 from entering into the lower rail 21 further.

At the rear end of the upper rail 26,
As shown in FIGS. 2 and 4, a spacer 262 is mounted. The spacer 262 is provided with the inverted U-shaped member 27.
To prevent the rear side walls from being deformed in a direction approaching each other and to prevent the rear part of the upper rail 26 from immersing in the lower rail 21. The rectangular spacer main body 263 and the spacer Body 26
3 comprises a pair of widthwise projecting pieces 264 projecting from the lower end edge in the opposite direction.

The spacer body 263 has the same width as the inner dimension between the side walls of the upper rail 26, and the vertical dimension is slightly longer than the vertical internal dimension of the inverted U-shaped member 27. In a state in which the lower end edge is fixed to the bottom member 22 and the bottom plate 22 of the lower rail 21 by being press-fitted into the character member 27 and fixed by welding stop or the like, the lower end edge slides on the bottom plate 22. It is dimensioned to touch.

Also, the plate 16 for preventing the side frame 13 from falling is formed by an inverted U-shaped member 27 from the edge of the horizontal plate 14.
A vertical folded portion 161 is formed by being folded downward along the side wall of the vertical direction, and a horizontal folded portion 162 is formed by being folded so that the lower end of the vertical folded portion 161 is further horizontal. The dimensions of the fall prevention plate 16 are set such that the lower surface of the horizontal folded portion 162 is in sliding contact with the upper surface of the top plate 24 of the lower rail 21 or a small gap is formed between the lower surface and the upper surface.
Accordingly, for example, in the example shown in FIG. 13, even if a torsional force is applied to the upper rail 26 in a clockwise direction around a center line extending in the front-rear direction, the horizontal folded portion 162
Abuts against the top plate 24 of the lower rail 21 so that the torsion of the upper rail 26 is reliably prevented.

As shown in FIGS. 2 and 3, the lock mechanism 3 includes a lock plate 4 mounted in an inverted U-shaped member 27 of an upper rail 26, and a lock spring 5 mounted in the lock plate 4. A tubular spring 6 attached to the outside of the lock plate 4, and a pipe-shaped slide lever 7 connected to the lock plate 4 by fitting an end of the tubular spring 6 to the outside. ing.

The lock plate 4 is formed by pressing a metal flat plate and bending both sides thereof at a center line extending in the longitudinal direction.
An arc plate 41 of a predetermined length dimension having an arc shape in a front view,
A pair of lateral plates 42 in the width direction extending forward from the arc plate 41 (to the left in FIG. 2), and an arrowhead projection 43 formed by laminating the front ends of the lateral plates 42 are provided. ,
A pair of locking plates 44 are provided in the width direction and project in opposite directions from the lower end edge of the rear portion of the arc plate 41.

As shown in FIG. 5A, the horizontal plate 42 extends downward from the side edge of the front part from the substantially central position in the longitudinal direction of the arc plate 41, and the end of the arc plate 41. And extends further forward. Each such horizontal plate 42
Are provided with bulging pieces 42a which bulge upward. Shaft holes 42b facing each other in the width direction are formed in each bulging piece 42a, and shaft holes 27a corresponding to each shaft hole 42b are formed in a pair of side walls of the inverted U-shaped member 27. , These shaft holes 4
By inserting the shaft 45 through the shafts 2b and 27a and caulking, the lock plate 4 is mounted in the upper rail 26 so as to be rotatable around the shaft 45.

On one side of the swelling piece 42a, a stopper piece 42c protruding forward is provided, and the stopper piece 42c abuts on the ceiling of the inverted U-shaped member 27 so that the lock plate is formed. Further rotation of the shaft 4 around the shaft 45 is prevented.

As shown in FIG. 5 (b), the arrowhead projections 43 are formed by bending the portions of the horizontal plates 42 extending forward from the distal ends thereof so as to abut each other. Have been. An arrowhead portion 43a is formed at the tip of the arrowhead projecting piece 43, and the arrowhead portion 43a is formed.
An arrow pattern portion 43b formed by notching upper and lower edges rearward from the base end portion is provided.

The locking plate 44 is formed in a rectangular shape in plan view, and the dimension between the left and right opposite edges is set slightly smaller than the inner dimension between the side plates 23 of the lower rail 21. , The side wall of the inverted U-shaped member 27 and the wing member 28
In the state where the lock plate 4 is mounted on the upper rail 26, a portion corresponding to the locking plate 44 is cut out, and a plate fitting groove 27b for fitting the locking plate 44 is formed in this portion. The locking plate 44 projects outward from the plate fitting groove 27b.

Each hanging plate 25 of the lower rail 21 is provided with a plurality of lock teeth 25a formed at a lower edge thereof at a constant pitch over a predetermined range in the longitudinal direction.
The locking plate 44 is provided with a lock hole 44a corresponding to the lock tooth 25a, and the lock plate 4 is turned around the shaft 45 in a counterclockwise direction.
4a is fitted over the lock teeth 25a, thereby locking the forward / backward movement of the upper rail 26, and the lock hole 44a coming off the lock teeth 25a by the clockwise rotation of the lock plate 4 around the shaft 45. The lock of the lock plate 4 is released.

The lock spring 5 is formed by bending a leaf spring having a length substantially equal to that of the horizontal plate 42 and a width slightly smaller than an inner dimension between the horizontal plates 42 into a predetermined shape. It is formed by doing. Figure 6 below
The side view shape of the lock spring 5 will be described based on FIG.

FIG. 6 is an explanatory side view showing a state in which the lock spring 5 is mounted on the lock plate 4. As shown in this figure, the lock spring 5 has a front spring 51 that rises forward (leftward in FIG. 6) at the turning point P, and a rear spring that rises rearward from the turning point P. It comprises a spring 52.

At a position adjacent to the bending point P of the spring 51, there is provided a locking recess 53 formed by bulging this portion upward. The fitting state of the lock spring 5 to the lock plate 4 is stabilized by being fitted into the mounted shaft 45.

Further, the lock spring 5 before mounting (FIG. 6)
(Indicated by a two-dot chain line) is set so that it is smaller than the bending angle β after mounting. Therefore,
When the lock spring 5 is mounted on the lock plate 4 attached to the upper rail 26, the lock spring 4 is elastically deformed in a direction in which the bending angle α is increased. A biasing force for biasing in the counterclockwise direction is formed.

The lock spring 5 is inclined obliquely from the lower rear of the lock plate 4 (the position indicated by the two-dot chain line in FIG. 6) toward the front (left side in FIG. 6) as indicated by the arrow. By moving it upward and inserting it between the horizontal plate 42 from the lower opening of the lock plate 4 and pressing it diagonally forward, the front end part goes up through the upper opening of the lock plate 4 and overshoots the shaft 45, and It comes into contact with the ceiling of the rail 26.

In this state, the lock spring 5 is further pressed obliquely upward toward the front, so that the front end of the lock spring 5 contacts the ceiling of the upper rail 26 and the rear end of the lock plate 4 Arc plate 4
1 is mounted in the lock plate 4 while being elastically deformed so as to gradually increase the bending angle α in a state of contact with the ceiling portion. And, the locking concave portion 53 is
When the lock spring 5 faces the lock spring 5, the pressing of the lock spring 5 is stopped. Then, the lock spring 5 that is elastically deformed attempts to return to the original state by the elastic force, and the locking concave portion 53 engages with the shaft 45, whereby the mounting of the lock spring 5 to the lock plate 4 is completed.

When the lock spring 5 is mounted in the lock plate 4, the bending angle β is larger than the initial bending angle α. In order to press the plate 41 upward, the lock plate 4 is urged counterclockwise around the shaft 45, whereby the lock hole 44 a of the locking plate 44 normally locks the lock teeth 2 of the lower rail 21.
5a, the upper rail 26 is restrained from moving back and forth.

In this state, the lock plate 4 is rotated clockwise around the shaft 45 against the urging force of the lock spring 5 so that the lock teeth 25 of the locking plate 44 are locked.
The engagement with “a” is released, so that the upper rail 26 can be moved back and forth.

The cylindrical spring 6 is mounted on the arrowhead portion 43b of the arrowhead projection 43 and is interposed between the slide lever 7 and the arrowhead projection 43.
, The rattling of the slide lever 7 against the lock plate 4 is prevented. Hereinafter, the cylindrical spring 6 will be described with reference to FIG.

FIGS. 7A and 7B are views showing one embodiment of the tubular spring 6, wherein FIG. 7A is a front view, FIG.
(C) is a bottom view. As shown in FIG. 7, the tubular spring 6 is formed by bending a plate-shaped spring material into a tubular shape so that the side edges face each other at the top.

The tubular spring 6 has a spring body 61 having a cylindrical shape, and a pair of side cut and raised pieces 62 in the width direction formed by cutting and raising inward on both sides of the spring body 61. And a pair of bottom cut-and-raised pieces (cut-and-raised locking pieces 63 and cut-and-raised press pieces 64) that are cut and raised outward in a line in the front-rear direction at the bottom of the spring body 61. It is configured.

The inner diameter of the spring body 61 is set slightly smaller than the diagonal dimension of the arrowhead portion 43b of the lock plate 4 when viewed from the front, and the outer dimension is slightly smaller than the inner diameter of the slide lever 7. The diameter is set slightly smaller, and the diameter is slightly increased by being press-fitted into the arrowhead portion 43b from the arrowhead portion 43a (FIG. 5), so that the slide lever 7 can be fitted to the spring body 61 in a sliding contact state. It has become.

Each of the side cut and raised pieces 62 is shown in FIG.
As shown by the dotted line in FIG. 7, the front (left side in FIG. 7) side is formed by being bent in the direction facing each other. The clearance between the distal ends of the cylindrical springs 6 is set smaller than the thickness in the width direction of the arrowhead portion 43b, and the cylindrical spring 6 is fitted to the arrowhead portion 43b ((b) in FIG. 5). The arrow pattern 43b presses and clamps the pair of side cut and raised pieces 62, thereby preventing rattling in the left-right direction between the cylindrical spring 6 and the arrow pattern 43b. It is configured to be in a state of being prevented from rotating with respect to the arrow pattern 43b.

The pair of bottom cut-and-raised pieces (cut-and-raised locking pieces 6)
3 and both the cut-and-raised pressing pieces 64) are formed by cutting and raising the rear part (right side in FIG. 7) outward as shown in FIG. On the other hand, the slide lever 7
5, a retaining hole 71 is formed at a position corresponding to the cut-and-raised locking piece 63, as shown in FIG. Therefore, the slide lever 7 is cut and raised by fitting the slide lever 7 to the cylindrical spring 6 so that the rear edge of the locking piece 63 interferes with the rear edge of the retaining hole 71 to prevent the slide lever 7 from coming off. Since the cut-and-raised pressing piece 64 is elastically deformed toward the inside of the spring main body 61, the inner peripheral surface is pressed by the elastic force, thereby preventing the slide lever 7 from rattling against the cylindrical spring 6. It has become so.

When the slide lever 7 is mounted on the lock plate 4 via the cylindrical spring 6 as shown in FIG. In order to press the surface, the pressing force causes the spring body 61 to be inclined with respect to the arrowhead portion 43b of the arrowhead projecting piece 43, so that the pressing piece 64 and the lower front edge of the spring body 61 are moved by the slide lever. 7 and the upper rear edge of the spring main body 61 abuts on the upper inner peripheral surface of the slide lever 7. Since the surface is pressed at the diagonal edge portions of the front and rear of the spring body 61, rattling of the slide lever 7 in the vertical direction is suppressed.

In FIG. 5, for convenience of illustration, the outer peripheral surface of the cylindrical spring 6 and the inner peripheral surface of the slide lever 7 are shown in close contact with each other. 6 is set slightly larger than the outer diameter dimension, and the dimensional difference is absorbed by the cut and raised pressing piece 64. Accordingly, the dimensional variation of the slide lever 7 or the lock plate 4 during the assembling operation is absorbed by this dimensional difference, and as a result, the lock plate 4 of the slide lever 7 is locked.
The operation of assembling the device can be easily performed.

The operation of the present invention will be described below with reference to FIG. 8A and 8B are explanatory diagrams for explaining the operation of the present invention. FIG. 8A shows a state in which a large forward force is applied to a seat occupant, and FIG. Each shows a state where a large heading force is applied.

First, a vehicle traveling forward stops suddenly,
When a collision occurs, as shown in FIG. 8A, a large forward force F1 acts on the occupant. This force F1
Is transmitted to the upper rail 26 via the seat belt 18 and the anchor shaft 15a, and attempts to lift the upper rail 26 upward via the anchor shaft 15a with a component force directed upward from the force F1.

However, the wing member 28 of the upper rail 26
The upper edge of the lower rail 21 abuts on the top plate 24 of the lower rail 21 via the upper steel ball 29a supported by the rear retainer 29, thereby preventing the rear portion of the upper rail 26 from rising. Because of the upper rail 2
6, a moment is generated around the contact point P1 between the steel ball 29a and the top plate 24 due to the counterclockwise force F1. This moment causes the front end of the upper rail 26 to sink into the lower rail 21. And

At this time, the lower lower portion of the steel ball 2 supported by the front retainer 29
9a. However, since the wing member 28 is formed by bending the side wall of the upper rail 26, the wing member 28 has a low opposing force against a force in the bending direction.
Therefore, it cannot withstand the force caused by the moment and is deformed in the bending direction via the steel ball 29a. Conventionally, the upper rail 26 sinks into the lower rail 21 due to the deformation of the wing member 28 described above.

In order to solve such a conventional inconvenience, in the present invention, a protection projection 261 is provided at the front end 260 of the upper rail 26. Since the protection protrusion 261 interferes with the bottom plate 22 of the lower rail 21 to prevent the tip of the upper rail 26 from entering the lower rail 21, the slide lever 7 (FIG. 3) is formed by the upper rail 26 sinking into the lower rail 21. The inconvenience that the lock plate 4 is disengaged from the lock teeth 25a due to the erroneous operation and the lock plate 4 is unlocked is reliably prevented.

Next, as shown in (b) of FIG. 8, when the vehicle traveling backward is suddenly stopped or collides, a large rearward force F1 acts on the seated person. This force F
1 is transmitted to the upper rail 26 via the seat back 12, and the contact point P2 between the front steel ball 29a and the top plate 24
A moment is generated due to the force F1 which turns clockwise, and the rear end of the upper rail 26 attempts to sink into the lower rail 21 by this moment. A spacer 262 is provided at the rear end of the upper rail 26. As a result, the spacer 262 interferes with the bottom plate 22 of the lower rail 21 to prevent the rear end of the upper rail 26 from entering the lower rail 21.
When the slide lever 7 descends due to sinking into the lower rail 21, the inconvenience such that the engagement of the lock plate 4 with the lock teeth 25a is released and the lock plate 4 is unlocked is reliably prevented.

[0063]

According to the first aspect of the present invention, a pair of upper rails in the width direction are provided with immersion preventing members for preventing immersion into the lower rail by contacting a part of the vehicle body, respectively. When the vehicle retreating suddenly stops or collides, the force applied to the seat is transmitted to the upper rail as a moment in which the front end or the rear end with the rear end or the front end of the upper rail as a fulcrum is directed downward. However, the immersion prevention member interferes with a part of the vehicle body to prevent the upper rail from sinking into the lower rail, thereby unlocking the lock of the upper rail, for example, by the locking mechanism provided on the slider. Such inconvenience can be avoided.

According to the second aspect of the present invention, the upper rail is provided with a protection projection projecting forward from the front end, and the lower end of the protection projection slides on the bottom surface of the lower rail, or Since the dimensions are set so that a small gap is formed between the bottom and the bottom, the sudden force or collision of the running vehicle causes the forward force applied to the seat to be the fulcrum at the rear end of the upper rail. Even if the front end of the upper rail is transmitted to the upper rail as a downward moment, the protection protruding piece at the front end of the upper rail abuts on the bottom surface of the lower rail to prevent the front end of the upper rail from sinking into the lower rail. This allows the operating rod to interfere with the lower rail and operate upward relative to the upper rail to release the lock by the lock mechanism. The disadvantage such that it can be reliably prevented.

Therefore, it is possible to reliably avoid the inconvenience that the locked state of the lock mechanism is released by the upward movement of the operation rod with respect to the upper rail when the vehicle is suddenly stopped, and the seat pops forward.

According to the third aspect of the present invention, a spacer is provided at the rear end of the upper rail so as to fill an inverted U-shaped gap, and the lower end of the spacer is in sliding contact with the bottom surface of the lower rail or between the bottom surface and the lower rail. Because a small gap is formed, the rearward force applied to the seat by the rearward force applied to the seat by the front end of the upper rail becomes Even if the lower moment is transmitted to the upper rail as a downward moment, the lower end of the spacer abuts against the bottom surface of the lower rail, thereby preventing the front end of the upper rail from sinking into the lower rail. Inconveniences such as unlocking caused by the lock can be reliably prevented.

Further, a large force is applied to the rear end of the upper rail due to a sudden stop of the running vehicle or the like, whereby deformation such that the side walls of the upper rail approach each other can be reliably prevented by the presence of the spacer. .

By providing the spacer, it is not necessary to take measures to increase the thickness of the material of the upper rail, and it is possible to prevent deformation and contribute to a reduction in material cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a seat to which a slider of the present invention is applied.

FIG. 2 is an exploded perspective view showing one embodiment of a lock plate urging structure.

FIG. 3 is a partially cutaway perspective view of the lock plate biasing structure shown in FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 1;

5A and 5B are diagrams of a lock plate which is a component of the lock plate urging structure, wherein FIG. 5A is a side view and FIG. 5B is a plan view.

FIG. 6 is an explanatory side view showing a mounting state of the lock spring to the lock plate.

FIG. 7 is a view showing one embodiment of a cylindrical spring;
(A) is a front view, (B) is a side view, and (C) is a bottom view.

FIG. 8 is an explanatory diagram for explaining the operation of the present invention;
(A) shows a state where a large forward force is applied to a seat occupant, and (B) shows a state where a large rearward force is applied to a seat occupant.

9A and 9B are explanatory diagrams for explaining a conventional seat slider. FIG. 9A illustrates a state in which a forward force is not applied to a seated person, and FIG. 9B illustrates a forward force applied to a seated person. Are added to each other.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat 11 Seat bottom 12 Seat back 13 Side frame 14 Horizontal plate 15 Vertical plate 15a Anchor shaft 16 Prevention plate 161 Vertical fold part 162 Horizontal fold part 17 Cushion pan 18 Seat belt 2 Slider 21 Lower rail 22 Bottom plate 23 Side plate 24 Top plate 25a Lock Tooth 25 Hanging plate 26 Upper rail 260 Front end 261 Protective protruding piece (submersion preventing member) 262 Spacer 263 Spacer body 264 Protruding piece 27 Reverse U-shaped member 27a Shaft hole 27b Plate fitting groove 28 Wing member 29 Retainer 29a Steel ball 3 Lock mechanism 4 Lock plate 41 Arc plate 42b Shaft hole 42c Stopper piece 42 Side plate 42a Swelling piece 43 Arrowhead projecting piece 43a Arrowhead part 43b Arrowhead part 44 Locking plate 44a Lock hole 45 Shuff 5 lock spring 51 spring 51 forward spring 52 rearward spring 53 engaging the recess 6 the tubular spring 61 spring body 62 side lug 63 engaging piece 64 pressing piece 7 slide lever 71 retaining hole F Floor

Claims (3)

[Claims] 1. A pair of widthwise lower rails fixed to a floor of a vehicle, and a pair of upper rails fixed to a seat and moved back and forth while being fitted into the respective lower rails via predetermined interposed members. A seat slider including a rail, wherein each of the upper rails has an immersion preventing member for preventing immersion of the upper rail into the lower rail by contacting a part of the vehicle body. Slider for seat to be. 2. The immersion prevention member is provided so as to project forward from a front end of the upper rail, and has a lower end slidably in contact with a bottom surface of the lower rail, or a slight gap is formed between the bottom surface and the lower rail. The slider for a seat according to claim 1, wherein the slider is formed by a protective projection piece dimensioned so as to be set. 3. The immersion prevention member is fitted between side walls of a rear end of the upper rail, and a lower end thereof is in sliding contact with a bottom surface of the lower rail, or a slight gap is formed between the bottom surface and the bottom surface of the lower rail. The slider for a seat according to claim 1, wherein the slider is formed by a spacer dimensioned so as to be set.