JPH02303938A - Seat suspension device - Google Patents

Abstract

PURPOSE:To obtain a supporting condition of a seat easily adjustable to hard and soft conditions by arranging an expansion supporting unit, with a tilt angle adjustable, between upper and lower frames while interposing a compression supporting spring between expansion parts of the expansion supporting unit. CONSTITUTION:In a shock absorber 31 serving as a telescopic expansion supporting unit, an upper end part in a side of a piston rod 31a, being a one end of the shock absorber 31, is pivotally supported to a side of an upper frame 1, while a lower end part in a side of a cylinder 31b, being the other end part of the shock absorber 31, is pivotally supported to a side of a lower frame 2 through a position adjusting mechanism 32. While a compression supporting spring 34 is interposed between the piston rod 31a and the cylinder 31b. By operating a rotary handle 38 of the position adjusting mechanism 32 to rotate an adjusting shaft 36, a nut block 37a screwed thereto is moved in a longitudinal direction to perform rise and fall of the shock absorber 31. Thus by adjusting repulsive resilient tension of the compression supporting spring 34, a supporting condition is changed to hard and soft conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a seat suspension device that allows weight adjustment.

[Conventional technology]

Conventionally, many automobile seats have been equipped with so-called seat suspension devices that absorb vibrations by elastically supporting notebooks. Some seats are equipped with a weight adjustment device to maintain a constant seat support height even when occupants of different weights are seated.

An example of a conventional seat suspension device of this type is shown in the third example.
To explain with the diagram, (1) is the upper frame, (2)
) is the lower frame, and this upper frame (1)
The lower frame (2) is connected to the lower frame (2) by a pair of left and right links (3) in an X shape so as to be movable up and down.

As is well known, this X-shaped sunk (3) has two link bodies (4) and (5) rotatably supported by a shaft (6) approximately in the center. The upper end of the rear side of each X-shaped sunk (3), that is, the rear end (5a) of the link body [5] is connected to the shaft (7) with respect to the upper frame (1).
The lower end, that is, the link body (4
) rear end (4b) is connected to the shaft (8) with respect to the lower frame (2).
) is rotatably mounted. The lower end of the front side of each of the X-shaped sinks (3), that is, the rear end (5b) of the link body (5) is in contact with the roller (9) with respect to the lower frame (2).
) so that it can move back and forth, and the upper end of the front side of the X-shaped sunk (3), that is, the link body (4)
The respective front ends (4a) of the upper frame (10) are connected to each other by a frame (10), thereby supporting the front portion of the upper frame (1) from below.

Also, the rear end (5a) of the link body (5) of the X-shaped sunk (3)
) are connected by a frame (11), and one end of each of a pair of springs (12) is locked to this.

A bell crank (14) is rotatably attached to the upper frame (1) by a pivot (13), and one end of the bell crank (14) is connected to an adjustment shaft (14) extending laterally and supported by the upper frame (1). I5), and the other end is rotatably connected to one end of the link piece (16) by a shaft (17). Further, this link piece (16) is connected to the equalizer beam (18) so as to be able to rotate around an axis (19), and is connected to the above-mentioned pair of springs (1
2) The other ends are respectively locked to both ends of the equalizer beam (18).

In this example, the adjustment shaft (15) is configured as a rotation shaft, and a thread groove (20) is formed in a part of the adjustment shaft (15), into which a nut (21) is screwed. One end of the bell crank (14) mentioned above is engaged with this nut (21) via an engagement pin.

Further, a shock absorber (22) is arranged approximately in the center of such a device, and one end of the shock absorber (22) is connected to the lower frame (22).
) is rotatably attached to the rear side of the frame (10), and the other end is rotatably attached to the frame (10).

Then, rotate the adjustment shaft (15) and tighten the nut (21).
), the tension of the tension spring (12) can be varied via the bell crank (14), link piece (16), and equalizer beam (18), so that the upper frame can be adjusted even when occupants of different weights are seated. (1) can be adjusted so that it is always maintained at a constant height.

[Problem to be solved by the invention]

However, according to the conventional configuration, the tension swivel (12), the bell crank (14), and the link piece (
16), an equalizer beam (18), etc., have a complicated structure and a large number of parts, and are time-consuming and costly to assemble. 22) requires space because it is arranged separately and independently, and the device becomes large, making it unsuitable for vehicles with limited installation space, such as passenger cars.

In view of the above, an object of the present invention is to provide a seat suspension device that can reduce the number of parts by simplifying the structure, reducing costs, and making the seat suspension device more compact.

[Means to solve the problem]

In order to achieve the above object, a seat suspension device according to the present invention includes an upper frame supported by a lower frame so as to be movable up and down via a link mechanism, and a telescopic support with a nested hole provided between the lower frame and the upper frame. It is arranged in an inclined manner and is pivotally supported by both frames at both ends, and one side of both pivot parts of the support body is fixed in position, and the other side is movable in the tilt direction, so that the position of the support body can be moved. A position adjustment mechanism is provided on the possible pivot portion side, and a compression support spring is interposed between the telescopic portions of the support body.

[Operation] With this configuration, the telescopic support body connected in an inclined manner between the lower frame and the upper frame can be moved in position by using the position fixing part on one side as a fulcrum by adjusting the position adjustment mechanism. The tilt angle is variable.

When a load is applied to the upper frame from the seated person, the telescopic support body contracts, and is received by the compression support spring interposed between the telescopic parts of the support body, but the telescopic support body collapses. In this state, that is, when the inclination angle is small, the vertical component of the compression support spring decreases, and the reaction force of the spring decreases.In addition, the contraction speed of the telescopic support itself decreases due to the small inclination angle, and the load is reduced. Overall, it was received poorly.

On the other hand, when the telescoping support stands upright, that is, when the angle of inclination is large, the vertical component of the compression support spring increases and the reaction force of the spring increases. It is in a state where it is easy to contract under a load in the vertical direction, that is, the speed of contraction increases, and the reaction force of the compression support spring acts strongly against the load, so that the load is received as a whole in a hard state.

〔Example〕

Hereinafter, one embodiment of a seat suspension device according to the present invention will be described with reference to the drawings.

In Figures 1 and 2, (31) is a shock absorber as a telescopic support with a nesting hole, and its upper end on the side of the piston rod (31a), which is one end, is located below the approximate center of the upper frame (1). The lower end on the cylinder (31b) side, which is the other end, is pivoted on the lower frame (2) side so that its position can be adjusted in the front and back direction via a position adjustment mechanism (32), which will be described later. has been done. In this example, this shock absorber (31)
between the telescopic parts of the piston rod (31a) and the cylinder (31b).
A compression support spring (34) is interposed between seven lunge plates (33a) and (33b) which are fixed to the cylinder (31b) and the cylinder (31b), respectively.

The position adjustment mechanism (32) includes a support stand (35) provided on the rear side of the central part of the lower frame (2), and a support stand (35)
), the adjustment shaft (36
), a nut block (37) screwed onto the male threaded portion (36a) of the adjustment shaft (36), and the adjustment shaft (36).
It consists of a rotary handle (38) etc. attached to the rear end, and long holes (35a) are formed in the front and back direction on both the left and right sides of the support base (35).
Engagement pins (37a) protruding from both left and right sides of the nut block (37) are engaged with the nut block (37), so that the nut block (37) can be moved only in the front-back direction.

Then, the engagement pins (37) on both sides of the nut block (37) are
a) The cylinder of the shock absorber (31) (
31b) A ring member (
31b, ) are rotatably engaged, and the shock absorber (31) is attached to the upper frame (1) and the lower frame (2).
arranged in a slanted manner between the two.

In this example as well, the upper frame (1) is connected to the lower frame (2) so that it can rise and fall through an is shown as a route and its explanation will be omitted.

In the seat suspension device configured in this way, when the rotation handle (38) is turned, the adjustment shaft (36)
rotates, and the nut block (37) screwed into the male thread (36a) of this adjustment shaft (36) moves forward (in the direction of the arrow).
or backward (in the direction of arrow B). For example, when the nut block (37) is moved forward, the lower end of the shock absorber (31) moves forward and rotates in the upright direction using the pivot point of the upper end relative to the upper frame (1) as a fulcrum. Since the angle of inclination is large, compression support springs (
As the vertical component W=Pcosθ of the spring force P in 34) increases, the piston speed of the shock absorber (31) increases, and the rebound elasticity of the spring (34) against the seating load increases, resulting in a hard support state as a whole. , ideal for sitting on heavy people.

Furthermore, when the nut block (37) is moved rearward, the lower end of the shock absorber (31) moves rearward and rotates in the direction of collapse, and the angle of inclination becomes small, so the compression support spring (34) ) vertical component of spring force P = Pcosθ
decreases, the piston speed of the shock absorber (31) decreases, and the rebound elasticity of the spring (34) against the seating load decreases, resulting in a soft supporting state as a whole, which is ideal for a person of light weight to sit on. becomes.

As described above, in this embodiment, by simply changing the inclination angle of the shock absorber (31) arranged in an inclined manner between the upper frame [1] and the lower frame [2], the compression support spring (34) The support state for the sitting load can be changed without directly operating the seat, that is, the weight can be adjusted, and the operability is good.
Also, in terms of structure, the compression support spring (34) is integrated with the shock absorber (31) and does not require its own operating member, so the number of parts is reduced, making it possible to reduce costs and make it more compact.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in this embodiment, a compression support spring is interposed in the shock absorber, but a pre-inserted telescopic shaft may be used instead of the shock absorber. Furthermore, the link mechanism connecting the upper frame (1) and the lower frame (2) is not limited to the X-shape, and a parallel link can be used.

[Effects of the Invention] As described above, according to the present invention, the telescopic support is arranged between the upper frame and the lower frame so that the inclination angle can be variably adjusted, and By interposing the compression support spring, the seating load is supported by the compression support spring, and this support pressure can be set arbitrarily by simply adjusting the inclination angle of the telescoping support without directly operating the support spring. The operability in weight adjustment is extremely good, and the structure is simple as the compression support spring is integrated with the telescopic support and no separate operating member is required, reducing the number of parts and cost. It also has the advantage of being able to be made more compact.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a linear side view of the seat suspension device according to the present invention, FIG. 2 is a sectional view taken along the first line
The figure is a perspective view of a conventional seat suspension device.

In the figure, (1) is an upper frame, (2) is a lower frame, (31) is a shock absorber as a telescopic support,
(32) is a position adjustment mechanism, and (34) is a compression support spring.

1 near shiva 2 rem 2:n7 frame 31 Niji 3 Nokufu” Soba 32: Itittat48a 34: Manshiρoume pray♂yu Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] An upper frame is supported to be movable up and down with respect to the lower frame via a link mechanism, and a telescoping telescopic support is disposed in an inclined manner between the lower frame and the upper frame, and at both ends. The support body is pivotally supported by both frames, and one side of both the pivot parts of the support body is fixed in position, and the other side is movable in the inclination direction, and the movable pivot part side of the support body is A seat suspension device comprising a position adjustment mechanism, and a compression support spring interposed between the telescopic portions of the support body.