JPH0228095Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cushion length variable mechanism for a vehicle seat.

[Prior art]

As a type of vehicle seat, both sides of the seat cushion and the lower end of the seat back are respectively assembled to upper rails that make up a pair of left and right seat tracks, and the seats are moved forward and backward along the lower rails that make up each of the seat tracks. There is a vehicle seat configured to be movable in a direction.

This type of vehicle seat is mainly used as a front seat, and can be adjusted to a position that optimizes the posture of the occupant by moving the seat forward and backward according to the physique of the occupant. It is.

However, in this type of vehicle seat,
In order to optimize the posture of the seated person according to his/her physique, it is desirable that the cushion length of the seat cushion is adjusted not only in the longitudinal direction of the seat but also in accordance with the seat position adjustment. That is,
Desirably, the cushion length is automatically adjusted in accordance with the adjustment of the seat position so that it becomes shorter when the seat is adjusted forward and becomes longer when the seat is adjusted rearward.

In order to deal with this, the present applicant filed a U.S. Pat.
No. 137592 is filed for a variable cushion length mechanism for vehicle seats. In the above-mentioned vehicle seat, such a variable mechanism is such that both sides of the seat cushion are attached to the upper rail through a link mechanism so as to be swingable in the front and back direction, and the link mechanism is configured such that the lower end thereof is An engaging protrusion is provided at the intermediate portion of at least one swinging link rotatably connected to the upper rail, and the engaging protrusion extends upwardly from the upper rail at an angle in the front-rear direction. A guide member having a guide groove movably engaged is provided, and the upper end side of the swing link is configured to swing rearward due to the action of the guide groove when the seat moves forward. .

As a result, in this type of variable mechanism, the upper end side of the swing link is made to swing rearward when the seat moves forward and forward when the seat moves rearward, thereby making the swing link one of the constituent members. The seat cushion can be swung in the same direction as the upper end side of the swiveling link via the link mechanism.

Therefore, when the seat cushion is adjusted to the front of the seat, the seat cushion can be moved backward, and when the seat is adjusted to the rear, it can be moved forward. The seat can be adjusted so that the seated person has an optimal posture.

[Problem that the invention attempts to solve]

As described above, in this type of variable mechanism, the cushion length of the seat cushion can be automatically adjusted according to the longitudinal position adjustment of the seat, but the amount of adjustment of the cushion length depends on the amount of adjustment of the seat position. is constant. Therefore, in this type of variable mechanism, it is desirable that the amount of adjustment of the cushion length be variable.

[Means for solving problems]

In order to solve this problem, the present invention provides the guide member so that the inclination angle of the guide groove in the front and back direction can be adjusted.

[Functions and effects of the idea]

Therefore, in the present invention, by changing the inclination angle of the guide groove in the guide member in the longitudinal direction, the amount of swinging of the swing link in the longitudinal direction can be changed. Therefore, by changing the inclination angle of the guide groove, the amount of cushion length adjustment relative to the seat position adjustment can be changed, and the seat can be adjusted so that the seated person has a more optimal posture.

[Embodiment] The present invention will be explained below based on the drawings. Fig. 1 shows a vehicle front seat equipped with a cushion length variable mechanism (hereinafter referred to as variable mechanism) according to a first embodiment of the present invention. has been done.

The seat is provided with a pair of left and right seat tracks 11 and 12 as shown in FIGS.
3. The lower end of the seat bag S1 is rotatably attached to the lower arm 14. A known reclining adjuster (not shown) is interposed between one side of the lower end of the seat back S1 and the lower arm 14, and the seat back S1 is supported so that its inclination in the front and back direction can be adjusted by operating a lever 15. Further, the seat cushion S2 is attached to each of the upper rails 11a and 12a so as to be swingable in the front-rear direction via a link mechanism 20a constituting a variable mechanism to be described later. In the seat track 11, the upper rail 11a and the lower rail 11b are mutually locked by a known locking mechanism (not shown), and when the lever 16 is operated, the rail 11a is unlocked, and each upper rail 11a, 12a is locked. It is designed to be able to slide on the lower rails 11b and 12b in the front and back direction. Thereby, the position of the seat can be adjusted in the front-rear direction.

Thus, the variable mechanism is composed of a link mechanism 20a and a guide mechanism 20b.

The link mechanism 20a includes a pair of front and rear left and right first swing links 21a, 21b, and a rear pair of left and right second swing links.
Swing links 22a, 22b and third swing links 23a, 23b, both second swing links 22a, 2
2b, and a pair of connecting links 25a, 25b. The lower ends of each of the first swing links 21a, 21b are rotatably pivoted to brackets 17a, 17b provided on the upper rails 11a, 12a, and the upper ends thereof are swingable in the front-rear direction. It's summery. In addition, each second swing link 22a, 2
2b, connecting rods 2 are attached to their lower ends.
Each end of 4 is fixed in a penetrating state,
Each end of the connecting rod 24 is connected to the hinge plate 13,
By being rotatably supported on the lower rail 14, their upper end sides can swing in the front-rear direction. Furthermore, each third swing link 23a,
23b, the upper ends thereof connect to the hinge plate 13 and the bracket 1 provided on the lower rail 14.
7c and 17d so that their lower ends can swing in the front and rear directions. Each connecting link 25a, 25b is connected to each first swing link 21.
a, 21b and each second swing link 22a, 22b, each second swing link 22
The swinging of the first swinging links 21a, 21b
b to swing them in the same direction. In this link mechanism 20a, each first swing link 21a, 21b and each third swing link 23a, 2
3b supports the seat cushion S2, thereby making the seat cushion S2 swingable in the front-rear direction. In addition, in FIG. 3, reference numeral 26 indicates a torsion bar spring, and one end of the torsion bar spring 26 is locked to the hinge plate 13 side, and the other end is locked to the second swing link 22b. , same second
The swing link 22b is always urged rearward.

As shown in FIGS. 3 to 5, the guide mechanism 20b includes a roller 2 rotatably assembled to the outside of the intermediate protrusion of the second swing link 22a with a support pin 27a.
7b, and a guide member 28 fixed to the lower end surface of the lower rail 11b. The guide member 28 consists of a plate 28a fixed to the lower end surface of the lower rail 11b and extending upwardly outside the upper rail 11a, and an upper member 28b assembled to the inner side of the upper end, and the inside of the upper member 28b opens inward. It becomes a guide groove 28c. The guide groove 28c has a linear shape that slopes upwardly toward the front above the upper rail 11a, and a roller 27b is engaged with the inside thereof so that the guide groove 28c can roll.

As shown in FIG. 5, the top member 28b is rotatably attached to the plate 28a at its rear end, and as shown in FIG. Hole 28e
It is supported so that it can move up and down. This long hole 28e
is formed in an arc shape centered on the pivoting portion of the top member 28b, and the front end of the top member 28b is fixed to the plate 28a by the tightening force of a knob 28f screwed onto the support bolt 28d. The fixation is released by loosening the tightening force of the knob 28f. Thereby, the inclination angle of the guide groove 28c in the upper member 28b in the front-rear direction can be adjusted within the length range of the elongated hole 28e.

In the variable mechanism configured in this way, when both rails 11a and 11b of the seat track 11 are mutually locked, the roller 27b provided on the second swing link 22a engages with the upper and lower walls of the guide groove 28c. , restricts the swinging of the swinging link 22a. Therefore, the link mechanism 20a holds the seat cushion S2 at a predetermined position as shown by the solid line in FIG. 1 without swinging.

Therefore, by operating the lever 16, the rail 11
When the lock of a is released, each sheet track 1
The upper rails 11a and 12a can be slid on the lower rails 11b and 12b, and the position of the seat can be adjusted in the front-rear direction. When the sheet is moved forward as shown by the two-dot chain line in FIG.
It is guided diagonally upward while rolling within 8c, causing the upper end side of the second swing link 22a to swing rearward. The swing of this second swing link 22a is caused by the connection rod 24.
The swinging motion of both swinging links 22a, 22b is transmitted to the other second swinging link 22b via each connecting link 25a, 25b.
The signal is transmitted to the swing links 21a and 21b. As a result, the seat cushion S2 supported by both first swing links 21a, 21b and both third swing links 23a, 23b swings rearward. At this time, the torsion bar spring 26 assists the rearward swinging of the seat cushion S2. Therefore, when the seat moves to the position indicated by the two-dot chain line in FIG. 1, the seat cushion S2 is relatively moved back by a length L. Furthermore, when the seat is moved to its original position, the seat cushion S2 has a relative length L.
move forward and return to the original state.

By the way, in the variable mechanism in this embodiment, the amount of swing of the second swing link 22a is determined by the inclination angle of the guide groove 28c in the longitudinal direction, and the amount of relative movement of the seat cushion S2 is also determined thereby. That is, when the angle of inclination of the guide groove 28c is small, the amount of swing of the second swing link 22a is small and the amount of relative movement of the seat cushion S2 is also small, and as the angle of inclination gradually increases, the amount of relative movement of the seat cushion S2 is also small. As a result, the amount of swing of the second swing link 22a increases, and the amount of relative movement of the seat cushion S2 also increases. Therefore, according to this variable mechanism, by changing the inclination angle of the guide groove 28c by operating the knob 28f, it is possible to change the amount of adjustment of the cushion length with respect to the amount of adjustment of the seat position. The seat can be adjusted so that the person sitting in the seat has an optimal posture.

In addition, in the variable mechanism in this example,
In particular, most of the vertical load, such as the cushion assembly and the weight of the seated person, is transferred to both third swing links 23a and 23b.
Because of the structure in which the guide mechanism 20b is supported by the roller 27b, there is an advantage that the load on the roller 27b of the guide mechanism 20b can be reduced.

FIG. 7 shows a cushion length variable mechanism according to a second embodiment of the present invention. In such a variable mechanism, the guide mechanism 30b is similar to the guide mechanism 20b of the first embodiment, and the link mechanism 30a is the same as the link mechanism 20a of the first embodiment.
It is different from

Thus, the link mechanism 30a includes a pair of left and right first swing links 31a, 31b on the front side, a single second swing link 32 on the rear side, a pair of left and right third swing links 33a, 33b, and both first swing links 31a, 31b. Swing link 31
It is composed of a connecting rod 34 that connects the first swing link 31a and the second swing link 32, and a single link 35 that connects the first swing link 31a and the second swing link 32. In each of the first swing links 31a, 31b, as shown in FIGS. 7 and 8, a connecting rod 34 is fixed to the first swing link 31a, 31b.
It is attached to each upper rail 11a, 12a side so as to be swingable in the front and back direction. Also, connecting link 3
5 has its rear end pivoted to the upper end of the second swing link 32, and its front end pivoted to the middle part of the first swing link 31a, thereby connecting both links 31a and 32.

In such a variable mechanism, the seat cushion S
2 is the same as in the first embodiment, both first swing links 31a, 31b and both third swing links 33a, 3.
3b, the swing of the second swing link 32 is transmitted to the first swing link 31a on the left side via the connection link 35, and is transmitted to the first swing link 31b on the right side via the connection rod 34. It is also transmitted to Therefore, even in such a variable mechanism, the link mechanism 30
a and the guide mechanism 30b operate in the same manner as the variable mechanism of the first embodiment and produce the same effects, but the link mechanism 30a of the latter is different from the latter link mechanism 20a.
It has the advantage of having a simpler structure than that of .

[Brief explanation of drawings]

FIG. 1 is a side view of a front seat equipped with a variable mechanism according to a first embodiment of the present invention, FIG. 2 is an enlarged side view of the same mechanism, FIG. 3 is a perspective view of the same, and FIG.
FIG. 5 is an enlarged sectional view taken along the arrow line in FIG. 2, FIG. 6 is an enlarged sectional view taken along the arrow line in FIG. 2, and FIG. 7 is an enlarged perspective view of the swing link. FIG. 8 is a perspective view of the variable mechanism according to the second embodiment, and FIG. 8 is a perspective view showing the support portion of the first swing link. Explanation of symbols, 11, 12... Seat track,
11a, 12a...Atsupa rail, 11b, 12
b... Lower rail, 20a, 30a... Link mechanism, 22a, 32... Swing link, 20b, 30
b...Guide mechanism, 27b...Roller, 28...
Guide groove, 28d...support bolt, 28e...long hole, 28f...knob.

Claims (1)

[Scope of utility model registration request] For vehicles, in which both sides of a seat cushion and the lower end of a seat bag are respectively assembled to upper rails constituting a pair of left and right seat tracks, and are movable in the front-rear direction along each lower rail constituting each of the seat tracks. In the seat, both sides of the seat cushion are attached to the upper rail via a link mechanism so as to be swingable in the front and back direction, and the link mechanism is configured such that a lower end thereof is rotatably pivoted to the upper rail. An engaging protrusion is provided at the intermediate portion of at least one swinging link that has been attached, and the lower rail is provided with a guide that extends upwardly from the upper rail so as to be inclined in the front-rear direction, and with which the engaging protrusion is movably engaged. A guide member provided with a groove is provided so that the inclination angle of the guide groove in the front-rear direction can be adjusted, and when the seat moves forward, the upper end side of the swing link swings rearward due to the action of the guide groove. A cushion length variable mechanism for a vehicle seat, characterized in that: