JPH0426266Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seat slide device, and particularly to a seat slide device for a vehicle seat.

[Prior art]

As a type of seat slide device, as exemplified in Automotive Engineering Handbook, Volume 6, Page 26 (published by the Society of Automotive Engineers of Japan), there is a lower rail that is attached to the floor of the vehicle body, and a seat slide device that extends in the longitudinal direction (front and rear direction) of the lower rail. a seat track equipped with an upper rail that is slidably fitted and to which the seat is assembled;
a lock plate fixed to the lower rail and located on one side of the upper rail and having a plurality of engagement openings along its longitudinal direction; a seat rotatably assembled to the upper rail and located along its longitudinal direction; A track handle, a lock lever having an engagement protrusion which is fixed to the middle part of the handle and which, when rotated, projects into and out of each engagement opening of the lock plate from one side of the lock plate to engage and disengage it; Some devices include a locking mechanism that includes a spring member that biases the locking lever in the direction of protruding into the engagement opening of the locking plate.

Therefore, in the locking mechanism of this type of seat slide device, the upper rail against the lower rail is brought into contact with the front and rear opening edges in the longitudinal direction of the engagement opening of the lock plate and the front and rear side edges of the engagement protrusion of the lock lever. The seat track is locked by restricting sliding movement in the front and back direction.

[Problem that the invention attempts to solve]

By the way, in such a lock mechanism, when the lock lever is supported by the seat track handle in a cantilevered state, the engagement protrusion contacts the upper rail by coming into contact with either the front or rear side edge of the engagement opening of the lock plate. Therefore, if a large impact force that causes both rails to slide relative to each other is applied to the seat track, the engagement protrusion of the lock lever will be deformed by the force applied from the lock plate, preventing the lock plate from engaging. It becomes easier to exit from the opening, and the seat track is more likely to be released from the locked state. Therefore, in order to increase the locking strength of the locking mechanism, it is necessary to increase the rigidity in the longitudinal direction by increasing the plate thickness of the locking lever so that it does not easily deform even under large impact forces. As a result, the cost and weight increase by increasing the rigidity.

[Means for solving problems]

In order to solve this problem, the present invention provides a seat slide device of the type described above, in which a second engagement protrusion can enter and exit a portion of the upper rail that is opposite to the engagement protrusion of the lock lever.
At the same time, the width of the engagement protrusion of the lock lever in the front and back direction gradually narrows from the base to the distal end thereof, and when the lock lever is inserted, the engagement opening of the lock plate is provided at both longitudinal edges of the engagement protrusion. a tapered part that comes into contact with both the front and rear opening edges in the longitudinal direction of the locking plate, and a tapered part that has a substantially constant width in the front and back direction from this tapered part to the tip, and that is narrower than the respective engagement openings of the lock plate and the top plate and protrudes. In some cases, the front and rear edges of the upper rail are formed with straight portions that face substantially perpendicularly to the front and rear edges of the engagement opening of the upper rail.

[Functions and effects of the idea]

As a result, in the present invention, the engagement protrusion of the lock lever enters any one of the engagement openings of the lock plate and the second engagement opening provided in the upper rail due to the biasing force of the spring member. The contact between the front and rear edges of the tapered portion of the mating protrusion and the front and rear edges of the engagement opening of the lock plate prevents sliding of the upper rail in the front and rear direction relative to the lower rail without play, thereby improving the seat track. Lock state.

When a large impulse force or the like that causes both rails to slide relative to each other is applied to the seat track in such a locked state, the engaging protrusion of the lock lever will deform both side edges of the tapered part due to the force acting from the lock plate. However, as soon as this deformation begins, either the front or rear side edge of the straight part comes into contact with the front or rear edge of the engagement opening of the upper rail at approximately right angles, causing the engagement projection to deform. This prevents the engagement protrusion from exiting (coming off) from both engagement openings. Therefore, the lock lever is supported at its base end by the seat track handle and at its tip end by the upper rail, and this support on both sides exerts a large bearing force against the acting force from the lock plate. However, the lock lever exhibits high locking strength without causing any further large deformation.

Therefore, according to the present invention, there is no need to increase the plate thickness of the lock lever in order to increase the locking strength in the locking mechanism, and increases in cost and weight can be suppressed, and the locking strength can be set to the conventional level. In this case, the plate thickness of the lock lever can be made thinner, and cost and weight can be reduced. In addition, in the present invention, since the engagement protrusion of the lock lever is made up of a tapered part and a straight part, it is possible to restrict the sliding movement of both rails in the front and rear directions without any backlash, as described above, and When an impact force is applied, it deforms slightly and immediately exhibits high locking strength.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below based on the drawings. FIG. 1 shows a seat slide device according to an embodiment of the present invention.

The slide device includes a pair of left and right seat tracks 10a and 10b that support the front seat S.
and a lock mechanism 20 assembled to the right seat track 10b.

Each seat track 10a, 10b is a known one, and includes a lower rail 11 assembled to the floor of the vehicle body.
a, 11b, and an upper rail 12a that is fitted onto the upper surfaces of these rails and is slidable in the longitudinal direction (in the longitudinal direction of the vehicle body).The lower bracket 13 is erected on the left upper rail 12a, and the upper right rail 12b is erected. A seat cushion S1 is fixedly assembled to the lower bracket (not shown). Further, a seat bag S2 is fixedly attached to the left upper bracket 14 and the right upper bracket (not shown), which are attached to the rear ends of the left and right lower brackets 13 so as to be rotatable by a predetermined amount in the front-rear direction. A known reclining adjustment mechanism 30 is interposed between the left brackets 13 and 14. In this reclining adjustment mechanism 30, an operating lever 31 extending forward
By pulling up the operating lever 31, a ball (not shown) is disengaged from the ratchet, thereby releasing the upper bracket 14 from the lower bracket 13. In this state, the seat back S2 can be tilted forward by the biasing force of the torsion spring 32, and the seat back S2 can be adjusted to a desired inclination angle by releasing the operating lever 31 and engaging the ball with the ratchet.

As shown in FIGS. 1 to 3, the lock mechanism 20 releasably fixes the upper rail 12b constituting the right seat track 10b to the lower rail 11b, and includes a lock plate 21, a seat track handle 22, and a lock lever. 23 and a torsion bar spring 24. The lock plate 21 is fixed to the lower surface of the lower rail 11b, faces inside the upper rail 12b, and extends in the front-rear direction along the rail 12b. This lock plate 21 is provided with a large number of engagement holes 21a provided at equal intervals in the front-rear direction on its inner side. The seat track handle 22 (hereinafter referred to as the handle) is attached to the top rail 12.
The front and rear shaft supports 25a and 25b of the bracket 25 fixed to the approximate center of the upper surface of b and the front bracket 2
The upper rail 12b is rotatably supported at 6.
It extends from the front end to approximately the center. A lock lever 23 is fixed at the upper end of its base 23a to a middle portion of the handle 22, located between both shaft supports 25a, 25b of the bracket 25. The base 23a of the lock lever 23 extends downwardly and has a lock plate 21 at its lower end.
The engaging protrusion 23b is provided with an engaging protrusion 23b that bends and extends upward. This engagement protrusion 23b is connected to the lock plate 2.
It is possible to enter into and exit from each engagement hole 21a of No. 1. In addition, the torsion bar spring 24
is locked to the handle 22 and the upper rail 12b, and the engagement protrusion 23b of the lock lever 23 locks the handle 22 into the engagement hole 21 of the lock plate 21.
It is constantly biased in the direction of entering a.

An engagement hole 12c cut downward is provided inside the upper rail 12b. This engagement hole 12c is located corresponding to the engagement protrusion 23b of the lock lever 23 fixed to the handle 22,
On the other hand, the engaging protrusion 23b of the lock lever 23 is composed of a tapered part 23b1 and a straight part 23b2, as shown in FIG. Tapered part 2
3b1 is formed so that the width in the front and back direction gradually becomes narrower from the base 23a of the lock lever 23 toward the straight part 23b2 side, and when the lock lever 23 enters as shown in FIG. 3, it moves back and forth in the longitudinal direction as shown in FIG. The side edges 23c1 and 23c2 of the upper rail 12b abut against the longitudinally front and rear opening edges 21b1 and 21b2 of the engagement hole 21a of the lock plate 21, thereby restricting sliding of the upper rail 12b with respect to the lower rail 11b in the front-rear direction. In addition, the straight part 23b
2 is a lock plate 21 whose width in the front and back direction is approximately constant from the tip of the tapered portion 23b1 to its own tip.
and engagement holes 21a, 12 of atuparate 12b
c, and when entering as shown in FIG. 3, as shown in FIG. 5, the top rail 12
The opening edges 12d1 and 12d2 of the engagement hole 12c in the engagement hole 12b are opposed to each other so as to be substantially orthogonal to and in contact with both the front and rear opening edges 12d1 and 12d2 in the longitudinal direction.

In the slide device configured in this way, the engagement protrusion 23b of the lock lever 23 is connected to each engagement hole 21 of the lock plate 21 as shown in FIG.
a and the engagement hole 12c of the upper rail 12b, the upper rail 12
b is fixed to the lower rail 11b, and sliding in the front and rear directions is restricted. In this state, the front seat S is fixed at a desired position as shown by the imaginary line in FIG.

When the handle 22 is rotated in the clockwise direction shown in FIG.
3 rotates in the same direction, and its engagement protrusion 23b exits from the engagement hole 12c of the upper rail 12b and one engagement hole 21a of the lock plate 21, and the fixation of the upper rail 12b is released. As a result, the top rail 12b becomes slidable in the front and back direction, and the seat S can be adjusted to a desired position. When the rotation operation of the handle 22 is released after adjusting the position, the handle 22 is moved by the reaction force of the torsion bar spring 24. Rotate counterclockwise to return to lock lever 23.
The engagement protrusion 23b enters the other one of the engagement holes 21a of the lock plate 21 and the engagement hole 12c of the upper rail 12b and engages with the engagement hole 21a. As a result, the upper rail 12b is fixed to the lower rail 11b and movement in the front and back direction is restricted,
Fix the front seat S in the adjusted position.

By the way, in this slide device, as shown in FIG.
c1, 23c2 and engagement hole 2 of lock plate 21
The contact with both opening edges 21b1 and 21b2 at 1a restricts the sliding movement of the upper rail 12b in the front-back direction with respect to the lower rail 11b, locking the seat track 10b, and the engagement protrusion 2
Each side edge 2 of the straight part 23b2 in 3b
3c3 and 23c4 are opposed to each side edge portion 12b1 and 12d2 of the engagement hole 12c in the upper rail 23b with a slight spacing therebetween. Therefore, both rails 11 are connected to the seat track 10b.
When a large impact force that causes b and 12b to slide relative to each other is applied, the tapered portion 23b1 of the engagement protrusion 23b tends to deform due to the action from the lock plate 21. However, the straight portion 23b2 of the engagement protrusion 23b is connected to the engagement hole 1 of the upper rail 12b.
Front and rear opening edges 12d1, 12d2 in 2c
The lock lever 23 is cantilevered by the handle 22 in order to immediately abut substantially perpendicularly to the handle 22 to suppress the deformation of the engagement protrusion 23b and to prevent the engagement protrusion 23b from exiting (coming off) from both the engagement holes 12c and 21a. From the support, the handle 22 and the top rail 12b
Shift to double-sided support with lock plate 2
It exerts a large bearing force against the acting force from 1. Therefore, the lock lever 23 exhibits high locking strength without causing large deformation.

Particularly in this embodiment, since the engagement protrusion 23b of the lock lever 23 is constituted by the tapered part 23b1 and the straight part 23b2, both rails 11b and 12b are Sliding in the front-rear direction is regulated without play, and the straight portion 23b2 and the engagement hole 1
Due to the engagement with 2c, high locking strength is immediately and precisely achieved.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a seat slide device according to an embodiment of the present invention, Fig. 2 is an enlarged perspective view of a seat track equipped with a locking mechanism, and Fig. 3 is an enlarged view taken in the arrow-line direction of Fig. 2. FIG. 4 is an enlarged partial perspective view of the upper rail, and FIG. 5 is an enlarged cross-sectional view showing the engagement state of the lock lever with each engagement hole. Explanation of symbols: 10a, 10b...Seat track, 11a, 11b...Lower rail, 12a, 1
2b...Atsupa rail, 12c...Engagement hole, 20
...Lock mechanism, 21 ...Lock plate, 21
a...Engagement hole, 22...Handle, 23...Lock lever, 23b...Engagement protrusion, 23b1...Tapered part, 23b2...Straight part, 24...Torsion bar spring.

Claims (1)

[Scope of utility model registration request] A seat track includes a lower rail to be assembled to the floor of the vehicle body, an upper rail that is slidably fitted in the lower rail in the longitudinal direction and to which a seat is attached, and a seat track that is fixed to the lower rail and located on one side of the upper rail. a lock plate having a plurality of engagement openings along its length;
A seat track handle is rotatably attached to the upper rail and located along its longitudinal direction, and the seat track handle is fixed to the middle part of the handle, and when the handle is rotated, each engagement opening of the lock plate is opened from one side of the lock plate. A lock lever having an engaging protrusion that engages and disengages by moving in and out of the lock plate, and a lock mechanism that includes a spring member that biases the lock lever in a direction to push into the engagement opening of the lock plate. In the seat slide device, a second engagement opening through which the engagement protrusion can enter and exit is provided at a portion opposite to the engagement protrusion of the lock lever on one side of the upper rail; The width in the front and rear direction gradually narrows from the base toward the tip side, and when the lock plate is inserted, the front and rear edges of the lock plate come into contact with the front and rear edges of the engagement opening of the lock plate. The width in the front-rear direction from this tapered part to the tip is approximately constant, and the width is narrower than each engagement opening of the lock plate and the upper plate, so that when entering, the upper rail is engaged with the upper rail at both edges in the longitudinal direction. 1. A seat slide device comprising a straight portion facing substantially perpendicularly to both front and rear opening edges in the longitudinal direction of the opening.