JP2001334848A - Seat truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight and high strength seat truck. SOLUTION: A bottom plate part 11, a pair of upright parts 12a, 12b, a pair of flanges 13a, 13b, and a pair of drooping parts 14a, 14b are provided in a lower rail 1. An upper plate part 21 which is horizontally arranged on the upper position than the flanges 13a, 13b of the lower rail 1, a pair of side plate parts 22a, 22b, a pair of increasing width downward slope parts 23a, 23b which are extended diagonally downward, a pair of increasing width upward slope parts 24a, 24b which are extended diagonally upward, and a pair of decreasing width upward slope parts 25a, 25b which are extended diagonally upward are provided in an upper rail 2. Balls 61a, 61b, 62a, 62b are provided in space at corner parts of the upper and the lower sides which are inside the upright parts 12a, 12b of the lower rail 1. Each of the balls 61a, 61b is abutted on each of the outside surfaces of the decreasing width upward slope parts 25a, 25b of the upper rail 2, and each of the balls 62a, 62b is abutted on each of the outside surfaces of the increasing upward slope parts 24a, 24b thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat having a lower rail, an upper rail slidably engaged with the lower rail in a longitudinal direction thereof, and a lock mechanism for locking the upper rail so that the upper rail cannot slide. About the truck.

[0002]

2. Description of the Related Art For example, in an automobile, a seat track in which a lower rail is fixed to a floor side and an upper rail is fixed to a seat cushion frame side to adjust a seat forward and backward is widely used.

[0003] In this type of seat truck, when a running vehicle is suddenly stopped due to a collision or the like, a large force acts not only to push the upper rail forward but also to pull it upward diagonally due to inertial force. There is a risk of peeling from the lower rail. Therefore, even if the above situation is encountered, conventionally, in order to prevent peeling of the upper rail, etc.,
The strength has been ensured by increasing the plate thickness of the lower rail and the upper rail or by separately providing a reinforcing member for preventing peeling.

[0004]

In recent years, from the viewpoint of resource saving, etc., the weight of automobiles has been required to be reduced. However, unlike conventional seat trucks, the thickness of lower rails and upper rails is unnecessarily increased in order to increase strength. Increases the weight of the seat track, making it impossible to meet this demand.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a lightweight and high-strength seat truck.

[0006]

Means for Solving the Problems A first method for solving the above problems is described below.
The invention of the present invention relates to a seat track having a lower rail, an upper rail slidably engaged with the lower rail in a longitudinal direction thereof, and a lock mechanism for locking the upper rail so as not to slide on the lower rail. A bottom plate portion disposed horizontally, a pair of upright portions rising from both ends of the lower plate in the width direction of the lower rail, and a pair of horizontally extending from the upper end of the upright portion toward the center of the lower rail. And a pair of hanging portions extending downward from a tip of the brim portion, and the upper rail is horizontally disposed at a position above the brim portion of the lower rail, and a hanging portion of the lower rail is provided. An upper plate portion having a width smaller than the interval between the upper plate portion and both ends in the width direction of the upper rail in the upper plate portion, between the hanging portion of the lower rail. A pair of side plate portions that fall down in parallel with the hanging portion, a pair of widened down slope portions extending diagonally downward from the lower end of the side plate portions so as to spread in the width direction of the upper rail, A pair of widened rising slopes extending obliquely upward from the lower end of the sloped part so as to spread in the lateral width direction of the upper rail, and extending diagonally upward from the upper end of the widened rising slope to approach the center of the upper rail. A pair of narrowed rising slopes are provided, and balls are arranged in upper and lower corner spaces inside the upright portion of the lower rail, and the outer side surface of the reduced width rising slope of the upper rail is placed on a ball in the upper corner space. The outer side surface of the widened rising slope of the upper rail is brought into contact with a ball in the lower corner space.

In the present invention, when the upper rail rises by receiving a force in the peeling direction, the reduced width rising slope portion is pushed by the ball in the upper corner space inside the rising portion of the lower rail, and is deformed inside the upper rail, The upper end of the reduced width rising slope abuts on the root of the hanging part of the lower rail.
In addition, the intersection angle between the side plate portion of the upper rail and the widening descending inclined portion is expanded by receiving a force in the peeling direction, and restricts the tip of the hanging portion of the lower rail from approaching the center of the lower rail. As a result, the upper rail is deformed so as to entangle the hanging part of the lower rail, so that the upper rail is hardly peeled off. Therefore, even if the plate thickness of the upper rail and the lower rail is small, the peel strength is high.

According to a second aspect of the present invention, in the seat track according to the first aspect, an upper end of the reduced width rising slope portion of the upper rail is bent so as to rise vertically.

According to the present invention, when the reduced width increasing slope is deformed to the inside of the upper rail by being pushed by the ball in the upper corner space inside the upright portion of the lower rail, the upper end of the reduced width rising slope is attached to the lower rail. Good contact with the base of the hanging part.

According to a third aspect of the present invention, in the seat track according to the first or second aspect, an intersection between the widening down slope and the widening up slope of the upper rail is:
The lower rail is located outside the hanging portion of the upper rail in the width direction of the upper rail.

According to the present invention, when the crossing angle between the side plate portion of the upper rail and the widening descending inclined portion is widened by receiving the force in the peeling direction, the side plate portion pushes the hanging portion of the lower rail more strongly, and the tip of the hanging portion. It further restricts the section from approaching the center of the lower rail.

According to a fourth aspect of the present invention, in the seat track according to any one of the first to third aspects, a plurality of lock holes are formed in the upright portion of the lower rail at predetermined intervals in a longitudinal direction. An inner lock hole is formed in the widened rising slope portion and the reduced width rising slope portion of the upper rail, and one end side is fixed to the upper plate portion of the upper rail, and the other end side is provided outside the upright portion of the lower rail. Provide a bracket with side walls hanging down along the side,
An outer lock hole is formed in a side wall portion of the bracket at a position facing the inner lock hole of the upper rail, and at the time of locking, a lock claw is formed by the outer lock hole of the bracket, the lock hole of the lower rail, the upper rail. And the lock mechanism is configured so that the upper rail cannot slide with respect to the lower rail.

According to the present invention, the brackets located on both sides of the raised portion of the lower rail and the inner wall surfaces of the outer lock hole and the inner lock hole formed in the upper rail support the lock claws inserted into the lock holes of the lower rail. This makes it difficult for the locking claws to buckle, increasing the strength of the seat track in the sliding direction.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The seat track in FIG. 2 is used on the left side of the seat, and the left side in FIG. 2 is arranged on the front side. FIG. 1 shows a rail section viewed from the front side. The seat track of the present embodiment is
It has a lower rail 1 and an upper rail slidably engaged with the lower rail 1 in the longitudinal direction. The lower rail 1 is fixed to the floor using bolts 3 and the like protruding from the lower rail 1, and the upper rail 2 is attached to the seat cushion frame using the bolts 4 and 5 protruding from the upper rail 2. Can be

As shown in FIG. 1, the lower rail 1 has a bottom plate 11 disposed horizontally, a pair of upright portions 12a and 12b rising from both ends of the bottom plate 11 in the width direction of the lower rail 1. A pair of flange portions 13a, 13b extending horizontally from the upper ends of the portions 12a, 12b toward the center of the lower rail 1, and a pair of hanging portions 14a, 14b extending downward from the distal ends of the flange portions 13a, 13b are provided. ing.

The left and right ends of the bottom plate 11 and the upright 12
A step is formed at the intersection of the lower rails a and 12b toward the inside of the lower rail 1 in order to increase the bending rigidity and torsional rigidity of the lower rail 1.

The upper rail 2 has an upper plate portion 21 which is horizontally disposed above the flange portions 13a and 13b of the lower rail 1 and has a width smaller than the interval between the hanging portions 14a and 14b of the lower rail 1. A pair of side plate portions 22a and 22b which fall parallel to the hanging portions 14a and 14b in the space between the hanging portions 14a and 14b of the lower rail 1 from both ends of the upper plate portion 21 in the width direction of the upper rail 2; A pair of widening down slopes 23a, 23b extending obliquely downward from the lower ends of the upper rails 2a, 22b so as to spread in the width direction of the upper rail 2, and spread in the width direction of the upper rail 2 from the lower ends of the widening down slopes 23a, 23b. A pair of widened rising slopes 24a, 24b extending obliquely upward
And a pair of reduced width rising slopes 25a, 25b extending obliquely upward from the upper ends of the widening rising slopes 24a, 24b toward the center of the upper rail 2.

In the upper corner space inside the upright portion 12a of the lower rail 1, a total of eight balls 61a, four in front and behind, are arranged. In the upper corner space inside the upright portion 12b of the lower rail 1, there are front and rear balls. There are a total of eight balls 61b, four by four. In the upper corner space inside the upright portion 12b of the lower rail 1, eight balls 61b, four in front and behind, are arranged in total.

Further, in the lower corner space inside the upright portion 12a of the lower rail 1, a total of eight balls 62a, four in front and back, are arranged, and the upright portion 12b of the lower rail 1 is provided.
A total of eight balls 62b, four in front and behind, are arranged in the lower corner space on the inside.

Eight balls 61a and eight balls 62a
Are arranged at predetermined intervals by a retainer 71a shown in FIGS. 7 to 9 so that eight balls 61b and eight balls 6
2b are arranged at predetermined intervals by a retainer 71b.

The balls 61a and 61b respectively have reduced width rising inclined portions 25a and 25b of the upper rail 2.
The outer surfaces of the upper rails 2 are in contact with the balls 62a and 62b, respectively.

Here, the upper ends of the reduced width rising inclined portions 25a and 25b of the upper rail 2 are bent so as to rise vertically, for the following reason. When the vehicle is running, when the vehicle turns left and right, an inertial force acts on the occupant, and the seat receives a force in the same direction. Therefore, the upper rail 2 in FIG. 1 receives a rotational force (the center axis of rotation is perpendicular to the paper surface of FIG. 1) about its upper plate portion 21, but the upper ends of the reduced width rising inclined portions 25a and 25b. Is vertically raised, it can be reliably supported so as to wrap the balls 61a, 61b with the reduced width rising inclined portions 25a, 25b,
Reduced width rising inclined portions 25a, 25b and balls 61a, 61
The undesirable behavior of b can be avoided.

Also, the widened lower slope 23 of the upper rail 2
The intersections between the upper rails a and b and the widened rising inclined portions 24a and 24b are located outside the lower rails 14a and 14b of the lower rail 1 in the lateral width direction of the upper rail 2.

A support arm 101 is fixed to the upper plate 21 of the upper rail 2, and a lock lever 110 is attached to the tip of the support arm by a pin 102 so as to be horizontally rotatable. Furthermore, the upper plate 2 of the upper rail 2
One end of the bracket 120 is fixed to 1.
On the other end side of the bracket 120, a side wall portion 121 hanging down along the outer surface of the upright portion 12a of the lower rail 1 is formed.

The intermediate portion of the lock lever 110 has a long hole 1
11 is bored, and a pin 122 projecting from the bracket 120 is loosely fitted therein to regulate the rotation range of the lock lever 110. The lock lever 110 has a handle portion 112 at one end and two lock claws 11 at the other end.
3, 114 are formed. The widened rising slopes 24a, 24b and the reduced width rising slopes 25a, 2 of the upper rail 2
5b is provided with a pair of inner lock holes (grooves) 27 into which the lock claws 113 and 114 are fitted.
The lock pawls 113 and 114 are located on the side wall portion 121 of the upper rail 2 facing the inner lock hole 27 of the upper rail 2.
Are formed with a pair of outer lock holes 125 to which are fitted.

Further, the upright portions 12a, 12a of the lower rail 1
In b, a pair of lock holes 15 into which the lock claws 113 and 114 are fitted are formed at predetermined intervals in the longitudinal direction of the lower rail 1. For this reason, at the time of locking by the lock mechanism, the lock claws 113 and 114 are inserted through the outer lock hole 125 of the bracket 120, the lock hole 15 of the lower rail 1, and the inner lock hole 27 of the upper rail 2, and the upper rail 2 is inserted into the lower rail 1. Are locked so that they cannot slide. The spring 131
Is locked between the lock lever 110 and the bracket 120 and urges the lock lever 110 in the locking direction.

Next, the operation of the above embodiment will be described.
First, in the state shown in FIG. 2, FIG. 3 and FIG. 6, the lock claws 113 and 114 of the lock lever 110 are engaged with the lock holes 15 of the lower rail 1, and the seat track is locked so that the movement of the upper rail 2 is prohibited. In state.

To release the lock of the seat track from the locked state, the handle portion 112 is operated against the urging force of the spring 131 to rotate the lock lever 110 counterclockwise in FIG. As a result, the lock claws 113 and 114 of the lock lever 110 are disengaged from the lock holes 15, and the upper rail 2 is unlocked so as to be slidable with respect to the lower rail 1. In this state,
Move the seat back and forth, and lock the
5 can be selected. When the operating force is released by selecting the lock hole 15 at the desired position, the lock lever 110 meshes with the lock hole 15 after the position adjustment by the urging force of the spring 131, and the seat track returns to the locked state.

In this embodiment, as shown by the two-dot chain line in FIG. 1, when the upper rail 2 rises by receiving a force in the peeling direction, the narrowing-up slope portions 25a, 25b
Is pressed by the balls 61a, 61b in the upper corner space inside the upright portions 12a, 12b of the lower rail 1, and is deformed inside the upper rail 2, and the reduced width rising inclined portions 25a, 25
The upper end of b contacts the roots of the hanging parts 14a and 14b of the lower rail. Also, the side plate portions 22a of the upper rail 2,
The intersection angle of the lowering rails 22b and the widening descending inclined portions 23a and 23b is widened by the force in the peeling direction.
A, 14b restricts approaching the center of the lower rail 1. As a result, the upper rail 2 becomes the lower rail 1
The lower rails 14a and 14b are deformed so as to be involved, and the upper rail 2 is hardly peeled off from the lower rail 1.
Therefore, even if the plate thickness of the upper rail 2 and the lower rail 1 is small, the peel strength is high.

Further, the reduced width rising inclined portion 25 of the upper rail 2
Since the upper ends of the upper rails a and 25b are bent so as to rise vertically, the reduced width rising inclined parts 25a and 25b are pushed by the balls 61a and 61b in the upper corner space inside the rising parts 12a and 12b of the lower rail 1, so that the upper rails. When it is deformed inside 2, the upper ends of the reduced width rising inclined portions 25a and 25b come into close and good contact with the roots of the hanging portions 14a and 14b of the lower rail 1. For this reason, the peel strength is further increased.

Further, the widening down slope 2 of the upper rail 2
Since the intersection between the upper rails 3a and 23b and the widening and rising inclined portions 24a and 24b is located outside the hanging portions 14a and 14b of the lower rail 1 in the lateral width direction of the upper rail 2, the side plates 22a and 22b of the upper rail 2 and the widening and lowering slope. Part 2
The crossing angle between the side plates 3a and 23b is widened by receiving the force in the peeling direction (the side plates 22a and 22b and the widening down slopes 23a and 23
3b approaches one straight line) when the side plate portion 22
a, 22b strongly press the hanging parts 14a, 14b of the lower rail 1, and the tips of the hanging parts 14a, 14b
More restrictive of approaching the center of the Therefore, the peel strength is further increased.

The upright portions 12a, 12b of the lower rail 1
A plurality of sets of lock holes 15 are formed at predetermined intervals in the longitudinal direction, and the widened rising slope portions 24a, 2a of the upper rail 2 are formed.
4b and the reduced width rising inclined portions 25a, 25b are provided with inner locking holes 27, one end of which is fixed to the upper plate portion 21 of the upper rail 2, and the other end of which is the outer surfaces of the upright portions 12a, 12b of the lower rail 1. A bracket 120 having a side wall portion 121 hanging down along the axis is provided.
Side wall of the upper rail 2
An outer lock hole 125 is formed at a position facing the bracket 120 so that the lock claws 113 and 114
Outside lock hole 125, lower rail 1 lock hole 15,
Since the upper rail 2 is configured not to slide with respect to the lower rail 1 by inserting the inner lock hole 27 of the upper rail 2, the brackets 1 located on both sides of the lower rail 1 are formed.
20, lock claws 113, 1 inserted into the lock holes 15 of the lower rail 1 with the inner wall surfaces of the outer lock holes 125 and the inner lock holes 27 formed in the upper rail 2, respectively.
14, the locking claws 113 and 114 are less likely to buckle, and the strength of the seat track in the sliding direction (stripping strength).
Goes up.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the lower rail 1 is fixed to the floor when used, but the upper rail 2 may be fixed to the floor. Further, the number and interval of the balls 61a, 61b, 62a, 62b and the lock holes 15 need not be limited to those of the embodiment. Lock claws 113, 1 of lock lever 110
14 may be one or three or more.

[0034]

As described above, according to the first aspect of the present invention, the upper rail is deformed so as to entangle the hanging portion of the lower rail, and is hardly peeled off. Therefore, the thickness of the upper rail and the lower rail is reduced. In both cases, the strength of peeling or the like can be increased. Therefore, a lightweight and high-strength seat truck can be realized.

According to the second aspect of the present invention, when the reduced width rising slope is deformed to the inside of the upper rail by being pushed by the ball in the upper corner space inside the upright portion of the lower rail, The upper end can be satisfactorily brought into contact with the root of the lower part of the lower rail, and a seat truck with higher strength can be realized.

According to the third aspect of the present invention, when the crossing angle between the side plate portion of the upper rail and the widening descending slope portion expands due to the force in the peeling direction, the side plate portion makes the hanging portion of the lower rail stronger. It is possible to more strictly restrict the leading end of the pushing and hanging portion from approaching the center of the lower rail. Therefore, a seat track with higher strength can be realized.

According to the fourth aspect of the present invention, the bracket located on both sides of the upright portion of the lower rail and the inner wall surfaces of the outer lock hole and the inner lock hole formed in the upper rail are inserted into the lock holes of the lower rail. Since the lock claw is supported, the lock claw is less likely to buckle, and the strength of the seat track in the sliding direction can be increased.

[Brief description of the drawings]

FIG. 1 is a diagram showing a rail cross section in an embodiment of the present invention.

FIG. 2 is a plan view showing a main part in the embodiment of the present invention.

FIG. 3 is a side view showing a main part in the embodiment of the present invention.

FIG. 4 is a sectional view taken along a cutting line AA in FIG. 3;

FIG. 5 is a sectional view taken along a cutting line BB in FIG. 3;

FIG. 6 is a cross-sectional view taken along section line CC in FIG. 3;

FIG. 7 is a view showing a ball retainer according to the embodiment of the present invention.

FIG. 8 is an enlarged sectional view taken along section line DD in FIG. 7;

FIG. 9 is an enlarged sectional view taken along a cutting line EE in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower rail 2 Upper rail 11 Bottom plate part 12a, 12b Standing part 13a, 13b Collar part 14a, 14b Hanging part 15 Lock hole 21 Upper plate part 22a, 22b Side plate part 23a, 23b Wide decreasing inclination part 24a, 24b Wide increasing inclination part 25a, 25b Reduced width rising inclined portion 27 Inner lock hole 61a, 61b, 62a, 62b Ball 71a, 71b Retainer 110 Lock lever 113, 114 Lock claw 120 Bracket 121 Side wall portion 125 Outer lock hole

Claims (4)

[Claims] 1. A seat track comprising: a lower rail; an upper rail slidably engaged with the lower rail in a longitudinal direction thereof; and a lock mechanism for locking the upper rail so as not to slide on the lower rail. The lower rail has a bottom plate portion disposed horizontally, a pair of upright portions rising from both ends of the lower plate in the width direction of the lower rail, and a horizontal extending from the upper end of the upright portion toward the center of the lower rail. A pair of brim portions, and a pair of hanging portions extending downward from the tip of the brim portion, the upper rail being horizontally disposed at a position above the brim portion of the lower rail, and having the lower rail hang down. An upper plate portion having a width smaller than the interval between the portions, and a lower rail extending vertically from both ends of the upper plate in the width direction of the upper rail. A pair of side plate portions that fall down in parallel with the hanging portion in the space between the portions, and a pair of widened descending inclined portions that extend obliquely downward from the lower end of the side plate portion so as to spread in the width direction of the upper rail, A pair of widening rising slopes extending diagonally upward from the lower end of the widening falling slope so as to spread in the lateral width direction of the upper rail; and a diagonally upward direction from the upper end of the widening rising slope to approach the center of the upper rail. A pair of extended narrowing slopes, and a ball is disposed in the upper and lower corner spaces inside the upright portion of the lower rail, and a ball in the upper corner space has a narrower rising slope of the upper rail. A seat track in which an outer side surface is abutted, and an outer side surface of the widened rising inclined portion of the upper rail is abutted on a ball in a lower corner space. 2. The seat track according to claim 1, wherein an upper end of the reduced width rising slope of the upper rail is bent so as to rise vertically. 3. The crossing position of the widening descending slope portion and the widening rising slope portion of the upper rail is outside the hanging portion of the lower rail in the lateral width direction of the upper rail. Or the seat track according to 2. 4. A plurality of lock holes are formed in the upright portion of the lower rail at predetermined intervals in a longitudinal direction, and an inner lock hole is formed in the widened rising slope portion and the reduced width rising slope portion of the upper rail. A bracket having one end side fixed to the upper plate portion of the upper rail, and a side wall portion hanging down along the outer surface of the upright portion of the lower rail at the other end side, and a side wall portion of the bracket. An outer lock hole is formed at a position opposing the inner lock hole of the upper rail, and at the time of locking, a lock claw is formed between the outer lock hole of the bracket, the lock hole of the lower rail, and the inner lock hole of the upper rail. 4. The lock mechanism according to claim 1, wherein the lock mechanism is configured so that the upper rail cannot slide with respect to the lower rail. Seat track according to.