JPH0459174B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a seat lifter for adjusting the vertical position of a seat.

[Conventional technology]

Some automobile seats are equipped with a seat lifter that allows the height of the seat portion of the seat to be adjusted according to the physique of the occupant.

For example, as disclosed in Japanese Patent Application Laid-open No. 53-104360, an eccentric differential gear mechanism provided in a seat adjuster rotates a link that supports the front part of the seat of the seat. (hereinafter referred to as the first conventional example), in which the height of the front part of the
As disclosed in Japanese Patent Application Laid-open No. 47-20827,
The height of the front and rear portions of the seat can be adjusted independently by a pair of front and rear angle adjustment devices that can be operated independently of each other (hereinafter referred to as the second conventional example), or a special As disclosed in Japanese Patent Publication No. 58-170636, the seat portion of the seat is supported movably up and down on the floor of the vehicle body by a pair of front and rear parallel links, and one link is connected to a plurality of parallel links. The seat is linked to an operating device through a gear, and the entire seat is raised and lowered by raising and lowering the link using the operating device (hereinafter referred to as the third conventional example).
etc.

[Problem that the invention seeks to solve]

In the above-mentioned first conventional example and second conventional example, when adjusting the height of the seat part of the seat, the distance between the front and rear support shafts on the seat part side changes, so for example, the seat part has a length in the front and back direction. Means must be provided for absorbing variations in the distance between the two support shafts by providing a hole and slidably fitting one of the support shafts into the elongated hole.

If such a means is provided, there are problems in that the support of the seat portion of the seat becomes unstable, the seat portion may vibrate or wobble, and the structure becomes complicated.

The third conventional example requires a large number of gears and a braking device to stop the link at a desired position, making the overall structure complicated and large.

An object of the present invention is to provide a seat lifter that solves these problems.

[Means for solving problems]

In the seat lifter of the present invention, the first arm piece has a shaft hole drilled in the center of the base, and has an internal gear concentric with the shaft hole on one side of the base, and the number of teeth of the internal gear is A second external gear having a slightly smaller number of external teeth and meshing with the internal gear is provided on one side of the base, and a receiving hole is bored at the center of the external gear. an eccentric cam integrally formed with a shaft portion pivotably fitted into a shaft hole of the first arm piece, and a cam shaft fitted into a receiving hole of the second arm piece so as to be relatively rotatable. , constitutes an angle adjustment device in which the intersecting angle of both arm pieces can be adjusted by an eccentric differential gear mechanism, and among the pair of front and rear angle adjustment devices,
The tip of each arm piece in either one,
The arm of the other angle adjusting device is pivotally connected to the seat of the seat and the base member for supporting the seat, and the tip of the other arm is fixed to the seat or the base member. The front and rear portions of the seat portion of the seat can be raised independently of each other by pivoting the camshaft of each angle adjusting device to a rotating means independent of each other. It is adjustable.

[Effect]

In the seat lifter of the present invention, when the camshaft in the front angle adjustment device is rotated, for example, by the rotation means for the front portion of the seat portion of the seat, the eccentric movement of the eccentric cam in the front angle adjustment device causes The external gear moves endocycloidally along the inner periphery of the internal gear, and the arm pieces move per rotation of the camshaft,
The external gear and the internal gear are differentially moved by a pitch corresponding to the difference in the number of teeth, and in this way, the intersecting angle of both arm pieces changes, so that either arm piece is connected. The front part of the seat portion of the seat can be raised and lowered independently with respect to the rear part.

Furthermore, when the camshaft in the rear angle adjustment device is rotated by the rotation means for the rear part of the seat, the intersection angle of both arm pieces is adjusted in the rear angle adjustment device due to the same effect as in the above case. The rear part of the seat is raised and lowered independently of the front part.

When neither rotating means is operated, the internal gear and the external gear in each angle adjusting device remain in a locked state while meshing with each other. This is because the reduction ratio when changing the crossing angle of both arm pieces from the camshaft is extremely large.

Therefore, even if a braking device is not provided as in the past, the arms of each angle adjustment device are locked together, and when the vehicle is seated, or when the vehicle suddenly starts or stops, the seat portion of the seat is locked. Even if a load or other external force is applied to the seat, the relative angle between the arms does not change, and the seat remains in the state it was in when the operation of the rotating means was stopped.

〔Example〕

Embodiments of the present invention will be described below based on the accompanying drawings.

1 to 4 show a first embodiment of the present invention.

Reference numeral 1 designates a seat for a driver's seat of an automobile, which is composed of a seat portion 2 and a backrest portion 3.

Reference numeral 4 denotes a base member for supporting the seat 1, and in this embodiment, it is slidably fitted into a pair of left and right fixed rails 5 facing in the front and rear direction, which are fixed to the floor of the vehicle body (not shown). The base member 4 includes a pair of left and right movable rails 7 in the seat slide device 6, which can be stopped at a desired longitudinal position by an appropriate locking device (not shown).

Between the rear end of the seat portion 2 of the seat 1 and the rear end of the base member 4, there are left and right wheels 1 in which the intersecting angle of the two arm pieces 9 and 10 can be adjusted by an eccentric differential gear mechanism X. A pair of angle adjustment devices 8 are provided, and between the front end of the seat portion 2 of the seat 1 and the front end of the base member 4, a pair of left and right angle adjustment devices having substantially the same function as the angle adjustment device 8 are provided. An adjustment device 8' is provided.

The rear angle adjustment device 8 includes a pair of plate-shaped arm pieces 9 and 10, and a cam shaft 11 having an eccentric cam 11a.
It is equipped with as a main component.

The upper end of the first arm piece 9 is fixed to each side of the rear end of the seat 2 of the seat 1, and an internal gear 1 is attached to the inner periphery at the center of the lower end (base) of the arm piece 9.
A shallow circular recess 13 having a diameter of 2 and recessed toward the inside of the sheet 1 is formed by embossing. A shaft hole 14 is bored in the center of the recess 13, and the camshaft 11 is inserted into the shaft hole 14.
The shaft portion 11b is pivotally fitted.

The center of the base of the second arm piece 10 has an external gear 15 on its outer periphery, a receiving hole 16 in the center, and a circular convex portion 17 that protrudes inward of the seat 1. , formed by embossing.

The number of teeth of the external gear 15 is slightly less than the number of teeth of the internal gear 12 by about 1 or 2, and its diameter is smaller than the diameter of the internal gear 12 by more than the height of the internal teeth. The inner diameter of the receiving hole 16 is the same as that of the camshaft 11.
The diameter of the eccentric cam 11a is approximately the same as, or slightly larger than, the diameter of the eccentric cam 11a.

The arm piece 10 is arranged such that the external gear 15 meshes with the internal gear 12, and the convex part 17 is connected to the concave part 13 of the arm piece 9.
The eccentric cam 11a of the camshaft 11 is fitted into the receiving hole 16 so as to be relatively rotatable, and the inner surface of the arm piece 10 around the convex portion 17 slides on the outer surface of the arm piece 9. It is attached to the arm piece 9 so as to be in contact with each other.

Thus, the internal gear 12 that is integral with the arm piece 9
An eccentric differential gear mechanism X for adjusting the intersecting angle of the arm pieces 9 and 10 is formed by the external gear 15 integral with the arm piece 10 and the camshaft 11.

The tip of the arm piece 10 extending forward and downward from the lower part of the arm piece 9 is attached to the outer surface of a bracket 19 fixed to the rear upper surface of each movable rail 7 in the seat slide device 6, and is attached to an axis pointing in the left-right direction. It is pivoted with 20.

Reference numeral 21 denotes a cover plate, whose upper end overlaps the outer surface of the arm piece 10 and is fixed to the side surface of the rear end of the seat part 2 of the seat 1 with an appropriate set screw 22, and its lower end overlaps with the outer surface of the arm piece 10. 9 and the lower end of camshaft 1
By rotatably sandwiching the eccentric cam 11a of No. 1 and the base of the arm piece 10, the arm piece 10 is prevented from falling off from the arm piece 9.

Reference numeral 23 denotes a shaft hole bored in the center of the lower part of the cover plate 21, and the shaft portion 11b of the camshaft 11 is inserted through the shaft hole 23.

As described above, the angle adjustment devices 8 are arranged symmetrically on both the left and right sides of the seat portion 2 of the seat 1.
The inner ends of the respective camshafts 11 are connected to each other by a rectangular connecting cylinder 24 so as to rotate synchronously with each other.

A rotary handle 25 for manual operation, which is one type of rotation means, is firmly fitted to the end of the shaft portion 11b of the camshaft 11 that protrudes outward from the cover plate 21 in one angle adjustment device 8. There is.

Most of the front angle adjustment device 8' has the same configuration as the rear angle adjustment device 8, so the same components are designated by the same reference numerals in the drawings, and detailed explanations will be omitted. This will be omitted and only the different configurations will be explained.

In the rear angle adjustment device 8, the arm piece 9 is
Although it is fixed to the seat portion 2 of the seat 1, in the front angle adjustment device 8', the arm piece 9' and the cover plate 21' are shaped like arms similar to the shape of the arm piece 10. , and the tip of the sheet 1
It is pivotally attached to the front side surface of the seat portion 2 with a shaft 26 pointing in the left-right direction.

The inner ends of the respective camshafts 11 in the front left and right angle adjusting devices 8' are connected to each other by a connecting tube 24 so as to rotate synchronously with each other, and the cover plate 21' in one of the angle adjusting devices 8' A rotary handle 25 and another rotary handle 27 are tightly fitted to the end of the shaft portion 11b of the camshaft 11 that protrudes further outward.

In the seat lifter of the first embodiment configured as described above, when the rear rotary handle 25 is rotated, for example, clockwise in FIG. 1, the camshaft 11 is rotated in the same direction, and the eccentricity at that time is Due to the eccentric movement of the cam 11a, the external gear 15
moves in a clockwise direction in FIG. 4 along the internal gear 12 while rotating relative to the eccentric cam 11a.

At this time, the arm piece 10 integrated with the external gear 15 is
This corresponds to the difference in the number of teeth between the external gear 15 and the internal gear 12 per revolution of the camshaft 11 relative to the arm piece 9 which is fixed to the seat 1 while the base makes a slight eccentric movement. It is rotated counterclockwise in FIGS. 1 and 4 by the pitch.

In this way, by rotating the arm piece 10 in the counterclockwise direction in FIG. 1 with respect to the arm piece 9, the rear part of the seat part 2 is adjusted to
The arm piece 10 is raised so as to rotate upward about the shaft 20 at the tip thereof.

When the rotating handle 25 is rotated counterclockwise in FIG. 1, the operation is opposite to that described above.
The arm piece 10 is rotated clockwise in FIG. 1 relative to the arm piece 9, and the rear part of the seat part 2 is lowered so as to rotate downward about the front shaft 20.

When the rotary handle 25 is not operated, for example, as shown in FIG. 4, any part of the external gear 15 remains in mesh with the internal gear 12 and is in a locked state. This is done from the camshaft 11 side to both arm pieces 9 and 1.
This is because the reduction ratio when changing the zero crossing angle is extremely large.

Therefore, even without a special braking device as in the past, when the rotary handle 25 is not operated, both arm pieces 9 and 10 are always in a locked state, and when the user is seated on the seat 1 or the car suddenly starts. Even if a load or other external force is applied to the seat 2 of the seat 1 during a sudden stop, the relative angle of the arm pieces 9 and 10 will not change, and the seat 1 will remain stable when the rotating handle 25 is stopped. will be maintained in the same state.

This also applies to the front angle adjustment device 8'.

That is, when the rotary handle 27 is not operated, the external gear 15 and the internal gear 12 are in a locked state even in the front angle adjustment device 8', and the arm pieces 9' and 10 are fixed to each other. It is in a similar state.

When the front rotation handle 27 is rotated clockwise in FIG. 1, the arm piece 10 is rotated counterclockwise in FIG. rotate in the direction. As a result, the narrow angle between the arm pieces 9' and 10 increases,
The front portion of the seat portion 2 of the seat 1 is raised so as to rotate upward about a shaft 20 at the tip of the arm piece 10 of the rear angle adjustment device 8.

When the rotating handle 27 is rotated in the counterclockwise direction in FIG. is lowered so as to rotate downward about the shaft 20 at the rear.

Therefore, either rotating handle 25,2
7, the height of the rear and front portions of the seat portion 2 of the seat 1 can be adjusted independently of each other, which is convenient.

5 to 7 show a second embodiment of the invention.

In the following description, members having the same or similar functions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the first embodiment, as the front part of the seat part 2 of the seat 1 is raised and lowered, the front rotation handle 27 is moved.
Since it always floats so as to be located approximately in the center between the front part of the seat part 2 and the base member 4, there is a risk that the operating feeling of the person sitting on the seat 1 may be disturbed.

Therefore, in the second embodiment, the rotary handle 28 is pivotally fitted to the shaft 26 for connecting the arm piece 9' of the front angle adjustment device 8' and the front part of the seat part 2,
The rotary handle 28 and the camshaft 11 are connected to a first gear 29 which is tightly fitted to the rotary handle 28, and an intermediate gear 31 which is pivotally mounted on the cover plate 21' with a shaft 30 and meshes with the first gear 29. , camshaft 1
The above-mentioned problem is solved by interlocking with each other through a gear mechanism 33 consisting of a second gear 32 that is tightly fitted to the outer end of the first shaft portion 11b and meshes with the intermediate gear 31.

34 is a cover for covering the gear mechanism 33.

With the configuration of the second embodiment, not only the rear rotary handle 25 but also the front rotary handle 28 are always supported at a constant position with respect to the seat portion 2 of the seat 1, so that the seated person can The sense of operation will no longer be disrupted.

The present invention is not limited to the embodiments described above, but can be modified in many ways.

For example, instead of the rotation handles 25, 27, and 28, the front and rear camshafts 11 may be rotated by separate rotation means such as motors.

Further, in the above embodiment, one arm piece 9 of the rear angle adjustment device 8 is fixed to the seat portion 2 of the seat 1, and the other arm piece 10 is pivotally connected to the base member 4. The arm piece 9 is fixed to the base member 4, and the other arm piece 10 is pivotally attached to the seat part 2 side,
Alternatively, such a modification may be combined with a modification such as reversing the mounting positions of the front and rear angle adjustment devices 8', 8 in the above-described embodiment.

〔Effect of the invention〕

According to the present invention, the following effects can be achieved.

(a) According to the configuration of the present invention, each arm piece, seat portion, and base member of each angle adjustment device generally form a five-bar link structure, and the links need only be pivoted to each other. Unlike the first conventional example and the second conventional example described above, there is no need to use a continuous means for slidably fitting the shaft into the elongated hole. Therefore, the seat portion of the seat can be stably supported at all times without vibrating or rattling.

(b) It is only necessary to pivot or fix each arm piece of each angle adjusting device to the seat or base member, and the shaft can be slid freely into the long hole as in the first conventional example and the second conventional example. Since there is no need to use continuous means for fitting, the structure is simple and can be manufactured at low cost.

(c) In the angle adjusting device in which the tip of each arm is pivotally connected to the seat portion and the base member of the seat, the length of the arm is Significantly shorter than the conventional model,
In other words, the size can be reduced to about half that of the first conventional example, and the entire device can be made smaller.

(d) Since there is no need to provide a braking device or a large number of gears as in the third conventional example, the structure can be simplified.

(e) In the angle adjustment device in which the tip of each arm is pivotally connected to the seat seat and the base member, the angle adjustment device can adjust both arms from 0° to 360° in principle. The seat can be opened and closed over a range of Moreover, during the opening and closing of both arms, there will be no dead center or inoperable range due to the relationship with the other angle adjustment device.

(f) By making sure that the opening angle of the above-mentioned arm pieces is 0° or a cross angle close to it when the seat is lowered to its lowest point, the distance between the base member and the seat can be significantly reduced. In addition, by setting the opening angle of both arm pieces to be 180° or a crossing angle close to it when the seat is raised to the maximum, the length of both arm pieces can be made the shortest and miniaturization can be achieved. It's easy.

(g) In the case of an angle adjustment device in which the tip of each arm is pivotally connected to the seat portion of the seat and the base member, the eccentric movement of both arms within the angle adjustment device is controlled by the tip of each arm. The eccentric movement can be absorbed between the seat portion of the seat and the pivoting portion between the base member and the eccentric movement can be prevented from being directly transmitted to the seat, and the feeling of sitting on the seat during operation will not be deteriorated.

[Brief explanation of the drawing]

FIG. 1 is a side view of a support portion of an automobile seat equipped with a seat lifter according to a first embodiment of the present invention;
The figure is an enlarged longitudinal sectional front view taken along line A-A in Figure 1;
FIG. 3 is an enlarged sectional view taken along line B-B in FIG.
FIG. 4 is a longitudinal sectional view taken along the line C-C in FIG. 2, FIG. 5 is a side view of a support portion of an automobile seat equipped with a seat lifter according to a second embodiment of the present invention, and FIG. FIG. 5 is an enlarged cross-sectional view taken along the line D-D in FIG. 5, and FIG. 7 is a longitudinal cross-sectional view taken along the line E-E in FIG. 6. DESCRIPTION OF SYMBOLS 1... Seat, 2... Seat part, 4... Base member, 8, 8'... Angle adjustment device, 9, 9', 10...
...Arm piece, 11...Cam shaft, 11a...Eccentric cam,
11b... Shaft portion, 12... Internal gear, 14... Shaft hole, 15... External gear, 16... Receiving hole, 20,2
6...Shaft, 21, 21'...Cover plate, 2
5, 27, 28... Rotating handle (rotating means),
27... Axis.

Claims (1)

[Claims] 1. A first arm piece having a shaft hole drilled in the center of the base and having an internal gear concentric with the shaft hole on one side of the base, and a first arm piece having a slightly smaller number of teeth than the internal gear. a second arm piece provided with an external gear having external teeth and meshing with the internal gear on one side of the base and having a receiving hole bored at the center position of the external gear; An eccentric cam integrated with a shaft pivotally fitted into a shaft hole of the first arm and a cam shaft fitted relatively rotatably into a receiving hole of the second arm allow the two arms to intersect. An angle adjustment device whose angle can be adjusted by an eccentric differential gear mechanism is constructed, and the tip of each arm of one of the pair of front and rear angle adjustment devices is connected to the seat of the seat and the seat. one arm of the other angle adjusting device is fixed to the seat or the base member, and the tip of the other arm is attached to the base member or the seat. The height of the front and rear portions of the seat portion of the seat can be adjusted independently by connecting the camshafts of each angle adjusting device to mutually independent rotating means. Features a seat lifter.