JPH0144533B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat lifter, and more particularly to a seat lifter that lifts a seat cushion and a seat bag individually. The seat lifter is used to raise and lower the seat, particularly the seat cushion, relative to the floor in order to give the driver an optimal posture.

An example of a conventional seat lifter is shown in FIG. In this example, a front link 2 is pivotally supported on the front part of a frame 1 below the seat, a rear link 3 is pivotally supported on the rear part of the frame 1, both links 2 and 3 are connected by a torque transmission link 4, and parallel Configure links. The front and rear parts of the seat frame 5 are pivotally supported by both links 2 and 3, respectively. Translation of the torque transmission link 4 relative to the frame 1 thus results in raising and lowering the seat frame 5 relative to the floor of the vehicle. An operating lever 7 is attached to the drive member side of the two-way clutch 6 fixed to the seat frame 5, and the driven member side of the two-way clutch 6 is connected to the front link 2 via a plate 8. 9 is a reclining mechanism.

In the above configuration, when the operating lever 7 is rotated in the direction of arrow A about the two-way clutch 6, the driving member causes the driven member to follow the rotation. As a result, the driven member moves the plate 8 in the direction of arrow B, and simultaneously rotates the front link 2 in the direction of arrow C about the fulcrum 10. This rotation of the front link 2 displaces the torque transmission link 4 upward and forward, and rotates the rear link 3 about the fulcrum 11 in the direction of arrow D. Rotation of the front and rear links 2 and 3 in the directions of arrows C and D is performed using the seat frame 5, which is pivotally supported by these links, as the fulcrum 10,
11 in the center and move it upward to make the entire seat higher. After obtaining the desired height, the seat is maintained at the desired height by removing the operating lever 7. The two-way clutch 6 locks the external force acting on its driven member via the plate 18 without transmitting it to the driving member, so that when the driver is sitting on the seat, no external force acts on the seat frame 5. However, the seat height will not change. For example, a spring coupler can be used as the two-way clutch 6.

By the way, the seated person who needs to raise the seat cushion is small in stature and has short legs. Therefore, when adjusting the seat cushion to a high height, it is desirable to simultaneously shorten the front-rear length of the seat cushion.
The conventional example does not fully satisfy this requirement.

This invention focuses on the above-mentioned point, and allows the length of the seat cushion to be changed by lifting the seat cushion and seat back individually and moving the seat back forward or backward according to the amount of lift. . For this reason, the technical measures taken in the present invention are such that the seat lifter is connected to a front link that is pivoted to the front part of the frame below the seat, a rear link that is pivoted to the rear part of the frame below the seat, and a rotation of the link. It consists of a two-way clutch that adjusts the moving position, and a bracket that connects the front link and the rear link.A seat bag is attached to the bracket, a seat cushion is held by both links, and the seat cushion is connected to the rear link. The holding position of the seat cushion is disposed in a horizontal direction with respect to the pivot shaft, and the bracket is connected to the rear link by being shifted in the vertical direction from the holding position.

According to this means, the front link and the rear link are integrally linked by the bracket. When either link is rotated by the two-way clutch, both links follow and rotate. As a result, the bracket also swings. As a result, the seat bag attached to the bracket and the seat cushion held by both links are individually moved up and down in accordance with the direction of rotation of the links. Moreover, the seat cushion is attached to the rear link so that the holding position of the seat cushion is located approximately horizontally with respect to the pivot axis of the rear link.
On the other hand, the bracket to which the seat bag is attached is attached to the rear link at a position vertically shifted from the seat cushion holding position. Therefore, in accordance with the rotation of the rear link, the holding position of the seat cushion moves substantially in the vertical direction, but hardly moves in the longitudinal direction. However, the amount of vertical movement of the bracket, ie, the seat cushion, is suppressed to the extent that the position is shifted in the vertical direction, and the bracket or seat cushion moves in the front-back direction. Therefore, the seat bag moves back and forth with respect to the seat cushion while being lifted in response to the lift of the seat cushion. Thus, the seat cushion length is effectively adjusted. Preferably, the holding position of the seat cushion is arranged horizontally on the rear side of the rear link, and the bracket is located above this holding position and connected to the rear side of the rear link. As a result, when the rear link is rotated, both the seat cushion and the seat back are lifted. Moreover, as the seat back moves forward, the seat cushion moves upward, and
In response to this upward movement, the seat cushion length becomes shorter. Therefore, it becomes possible to realize the seat lift operation required by a small person.

Embodiments of the present invention will be described with reference to FIG. 2 and subsequent figures. The seat consists of a seat cushion 42 and a seat back 41.

As shown in FIG.
A shaft 23 is pivotally supported, and rear links 24a, 24b are pivotally supported at the rear thereof by shafts 47, 47b.
Preferably, but not necessarily, the front links 25a, 2 are provided in concentric relation to the two-way clutch 22.
5b are arranged around the shafts 23, 23b. As shown in FIG. 5, the front link 25a is connected to the two-way clutch 2.
Also serves as case 2. Further, an operating lever 27 is fixed to the driving member 26 side of the two-way clutch 22, and one end of the operating link 29 is connected to the driven member 28 side of the operating lever 27 by a shaft 48.
Attach it at the pivot point. The other end shaft 51 of the operating link 29 is pivotally connected to the rear link 24a. As shown in FIG. 4, the rear link 24a has a bell crank shape, and this rear link 24a also pivots the rear part of a bracket 30, which is a seat back side member, about a shaft 38. The front part of the bracket 30 is pivotally supported on the front link 25a by a shaft 39.

Furthermore, as shown in FIG. 3, the rear link 2
The other bracket 30b is disposed between the front link 4b and the front link 25b, and is pivotally supported by shafts 38b and 39b, respectively. And both brackets 30,30
The seat bag 41 is held by b.

A pipe-shaped front torque rod 44 serving as a coupling means is provided between both front links 25a and 25b, and a pipe-shaped rear torque rod 43 is provided and fixed between both rear links 24a and 24b, respectively. As a result, both front links 25a, 25b and both rear links 24a, 24b rotate simultaneously.

A seat cushion spring 45 that holds the seat cushion 42 is disposed on both torque clods 43 and 44. The rear edge side of the seat cushion spring 45 is rotatably held around the rear torque rod 43 by a plurality of clasps 46a fixed to the rear torque rod 43. Further, the front edge side of the seat cushion spring 45 is held by claws of clips 46, 46c rotatably locked to the front torque rod 44 so as to be movable in the front-back direction. As a result, the front links 25a, 2
5b and the rear links 24a, 24b are connected by brackets 30, 30b, respectively, since the front edge side of the seat cushion spring 45 can move in the front-rear direction relative to the front torque rod 44, both links 25a, 25b, 24a, 2
4b can rotate freely.

Although not shown, the front torque rod 44
The front edge of the seat cushion spring 45 may be rotatably held, and the rear torque rod 43 may move the rear edge of the seat cushion 45 in the longitudinal direction and hold the seat cushion 45 rotatably. Also, the seat cushion spring 45 can be directly connected to both torque clots 4.
3 and 44, the seat cushion pan supporting the seat cushion spring 45 may be held on both the torque rods 43 and 44 as described above. Furthermore, clip 46
b, 46c, by using a link disposed in the front-back direction of the seat, one end of this link is pivotally connected to the torque rod, and the other end is pivotally connected to the seat cushion spring. In contrast, the seat cushion spring 45 may be movable in the longitudinal direction and held rotatably.

In the rear link 24a, as shown in FIG. 4, a shaft 51 pivotally connects the other end of the operating link 29.
are located substantially vertically above the pivot shaft 47 of the rear link 24a, whereas the rear torque rods 43 are located substantially horizontally rearward with respect to the pivot shaft 47 and are connected to each other. There is. Furthermore, the shaft 38 on which the rear portion of the bracket 30 pivots is located between the rear torque rod 43 and the shaft 38 of the actuating link 29, i.e. above the rear torque rod 43. Also, a shaft 48 that pivots the front part of the operating link 29
is located on the lower rear side with respect to the shaft 23 of the driven member 28.

Therefore, the operating link 29 is moved forward in a substantially horizontal direction by clockwise rotation of the operating handle 27, ie, the driven member 28, as shown in FIG.
Therefore, the rotation of the driven member 28 is transmitted to the rear link 24a without loss, causing the rear link 24a to rotate counterclockwise. Moreover, the operation of the bracket 30 and the rear torque rod 43 due to the counterclockwise rotation of the rear link 24a is approximately vertical due to the fact that the rear torque rod 43 is located approximately horizontally with the pivot shaft 47 of the rear link 24a. It moves upward in the direction and hardly moves forward. However, since the rear part of the bracket 30 is connected at a position above the rear torque rod 43, it moves upward in the vertical direction and forward in the longitudinal direction.

As shown in FIGS. 5 and 6, a spring coupler may be used as the two-way clutch 22.
The spring coupler 22 has notches 31a, 31
The drive member 26 having the shape b and the notch 3 on one side thereof
A driven member 28 having a protrusion 32 arranged with a gap between the two members 26 and 28, a case serving as a front link 25a that accommodates both members 26 and 28, and one end of which is locked to the driven member 28 and the other end of which is a driving member. The front link 25 is engaged with the cutout portions 31 of the front link 26 in the free state
It has a pair of springs 33 that are frictionally joined to the inner circumferential wall of a. When the operating lever 27 is rotated clockwise as shown in FIG. 6, the drive member 26 is also rotated clockwise together with the shaft 23. At this time, one end of one spring 33 comes into contact with the notch 31b, causing the one spring 33 to contract. Next, the notch 31a comes into contact with the protrusion 32, moves the protrusion 32 of the driven member 28 somewhat clockwise, and also contracts the other spring 33, which is locked in the groove 32a of the protrusion 32. The frictional force between the spring 33 and the inner wall of the front link 25a is released.
Thus, the movement of the driving member 26 is controlled by the driven member 28.
transmitted to. Therefore, the operating link 29 connected to the driven member 28 rotates about the shaft 23 in the direction of arrow E as seen in FIG.
a moves in the direction of arrow F around the fulcrum 34.
Rotation of the rear link 24a in the direction of arrow F lifts the bracket 30 pivotally connected thereto and the rear torque rod 43 fixed thereto, raising the seat back 41 and seat cushion 42, respectively. The movement of the bracket 30 causes the front link 25a to rotate about the shaft 23 in the direction of arrow G. At this time, since the front link 25a is released from the frictional force of the spring 33, the front link 25a moves smoothly. When the operating lever 27 stops rotating or returns to its original position, the contracting force of the spring 33 is released and the spring 33 is frictionally engaged with the inner peripheral wall of the front link 25a, so that the seat height remains at the adjusted height. maintain. In this state, when a load is applied to the seat, the front link 25a attempts to rotate, but this is prevented by frictional engagement with the spring 33. Furthermore, although the operating link 29 attempts to rotate the driven member 28, this movement expands the spring, increasing its frictional engagement force, and the movement of the operating link 29 is blocked. The opposite movement of the operating lever 27 is caused by the action of the similar two-way clutch 22, which causes the seat cushion 4 to move in the opposite direction.
2, and lower the seat bag 41.

Please refer to FIGS. 4 and 7. When the seat is raised from the low position shown by the solid line to the high position shown by the two-dot chain line, the bracket 30, as shown in FIG.
and the rear torque rod 26 are respectively raised. Furthermore, the rear part of the bracket 30 moves forward by a length L1 toward the front of the seat at the same time as it rises. However, in the rear torque rod 26, the minute length L2 (L2
<L1) only moves toward the front of the seat. Therefore, the bracket 30 or seat bag 41 moves forward with respect to the rear torque rod or seat cushion 42, and the longitudinal length of the seat cushion 42 is shortened in accordance with the seat lift. That is, as shown in FIG. 7, when the seat is in the low position, the seat cushion length is length A, and in the high position, the seat cushion length is B (B<A).

In FIG. 7, range C indicates the rotation range of the front link, and range D indicates the rotation range of the operating lever.
Further, point H indicates the heel position of the seated person.

[Brief explanation of drawings]

FIG. 1 is a side view showing a conventional seat lifter, FIGS. 2 and 3 are perspective views of a seat incorporating an example of the present invention, FIG. 4 is a side view of a seat lifter according to an example of the present invention, and FIG. 4 is a sectional view taken along the arrow line in FIG. 4, FIG. 6 is a partial sectional view taken along the arrow line in FIG. . 21...Frame, 22...Two-way clutch,
24... Back link, 25... Front link, 30
... Bracket, 47 ... Pivot shaft, 41 ... Seat bag, 42 ... Seat cushion, 43 ...
holding position.

Claims (1)

[Claims] 1. A front link that is pivoted to the front part of the frame below the seat, a rear link that is pivoted to the rear part of the frame below the seat, a two-way clutch that adjusts the rotational position of the link, and both of the links. a seat bag is attached above the rear link of the bracket, the seat cushion is held by both links, and the seat cushion is horizontal to the pivot axis of the rear link to the frame. A seat lifter in which a holding position of the seat cushion is arranged in a direction, and the bracket is connected to the link by shifting the position in the vertical direction with respect to the holding position.