JPH04266539A - Seat suspension device - Google Patents

Abstract

PURPOSE:To prevent deformation of an energizing means and to ensure an excellent suspension force. CONSTITUTION:An energizing means 44 comprises a compression coil spring. An energizing mechanism 42 containing a compression coil spring 44 disposed in a given spot and being expanded through compression of the compression coil spring is spanned and stretched between the moving end and a lock piece 68 of a link 20.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat suspension device that elastically supports a seat using a suspension force from a biasing means.

0002

2. Description of the Related Art Seat suspension devices are mounted on the seats of vehicles, etc., to isolate a seated person from shocks, vibrations, etc. transmitted to the floor surface, and attenuate shocks, vibrations, etc. caused by the seated person.

This type of seat suspension device includes an upper frame on which the seat is placed, and a lower frame attached to the vehicle floor, etc., and the upper frame is connected to the lower frame via a substantially X-shaped extendable link, for example. It is attached to the frame so that it can be raised and lowered. The upper frame is elastically supported with respect to the lower frame by a biasing means that applies an upward biasing force (suspension force) to the upper frame.

[0004] In this type of seat suspension device, a configuration is known in which the suspension force of the seat can be adjusted by, for example, adjusting the urging force of the urging means. In such a configuration, the biasing means is usually formed of two tension coil springs having hooks at both ends, and, for example, one end is attached to a pivot point on the upper frame or the like so as to be swingable in the direction of expansion and contraction of the tension coil springs. It is constructed and stretched between the attached locking piece and the movable end of the link. The other end of the locking piece is
For example, it is attached to a nut, the nut is screwed onto a lead screw, and the lead screw is pivotally supported by an upper frame or the like via a bracket.

In such a configuration, the nut is screwed forward and backward by the rotation of the operating handle provided at the front end of the lead screw, and the locking piece is swung back and forth about the pivot point. , the biasing force of the tension coil spring changes, and the suspension force of the seat is adjusted.

[0006]

However, in the known seat suspension device as described above, the movable end of the link is constantly pulled by the biasing force of the biasing means, that is, the tension coil spring, and the upper frame is moved upward. energized.

However, in such a configuration, the load from the seated person or the like acts intensively on the tension coil spring, particularly on the hooks at both ends. Therefore, there is a risk that the hooks at both ends of the tension coil spring may be deformed or damaged due to excessive load from the seated person or deterioration of the spring material due to aging, and the safety of the seated person, etc. may be compromised. Cannot be secured.

Furthermore, in the known configuration, the urging force of the urging means is adjusted by swinging the locking piece by screwing the nut forward and backward as the lead screw rotates. However, in such a configuration, when the locking piece is swung by adjusting the urging force, the locking piece tilts with respect to the urging means, and the pivot point between the locking piece and the urging means is distorted. The locus of movement shifts in the left-right direction, and the pivot point is biased toward one of the tension coil spring sides. Therefore, a deviation occurs in the biasing forces from the two tension coil springs, and the biasing forces do not act smoothly on the upper frame, making it impossible to obtain a good suspension force.

In such a case, two tension coil springs with different bias forces are usually used to suppress deviation of the bias forces from the two tension coil springs. However, if the biasing forces of the two tension coil springs are different, the assembly process becomes complicated and work efficiency is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seat suspension device that prevents deformation of the biasing means and provides good suspension force.

[0011]

SUMMARY OF THE INVENTION To achieve this object, according to the invention, the biasing means are formed from a compression spring. A biasing mechanism that accommodates a compression spring disposed at a predetermined location and expands by compression of the compression spring is constructed and stretched between the movable end of the link and the locking piece.

0012

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a seat suspension device 10 according to the present invention includes an upper frame 14 on which a seat 12 is placed and a lower frame 18 attached to a vehicle floor 16 or the like. A telescopic link 20 is provided between the two.

[0014] The link 20, for example, has link arms 20a and 20b of the same length, with approximately central portions connected to a pivot pin 22.
They are connected (pivotally connected) and assembled into a roughly X-shape that can be expanded and contracted in the vertical direction. The link 20 includes the upper frame 14,
They are respectively disposed on the left and right sides between the lower frame 18 and support the upper frame so as to be movable up and down. In the embodiment, the link arm 20a is arranged on the inside, and the link arm 20b is arranged on the outside.

[0015] The pair of links 20 on the left and right sides are connected so as to be interlocked with each other. As can be seen from FIGS. 1 and 2, for example, the (front) connecting rod 24,
25, and the connecting rod 24 is rotatably attached to the front end of the upper frame 14, and the connecting rod 25 is rotatably attached to the front end of the lower frame 18.

Further, the rear end of the link arms 20a, 20b is connected between the left and right sides, for example, by the (rear) connecting rod 2.
8 and 29, respectively. For example, a roller 32 is provided at each end of the connecting rods 28 and 29, and the insides of the upper frame 14 and the lower frame 18 are used as roller guides 34 to move the connecting rod 28 to the rear end of the lower frame. , a connecting rod 29 is attached to the rear end of the upper frame so as to be movable in the front-rear direction.

According to such a configuration, the link arm 2
0a, 20b, that is, the rear end of the link 20 is formed as a movable end, and the front connecting rods 24, 25
As the link rotates (expands and contracts) around , the movable end of the link moves in the front and back direction, and
4, 29 Connecting rods 25, 28 between and lower frame 18
It compensates for changes in the spacing between.

As shown in FIGS. 1 and 2, a shock absorber 36 absorbs shocks, vibrations, etc. from the upper frame 14 and the lower frame 18.
is installed between the upper and lower frames. Shock absorber 3
6, for example, connects one end to the bracket 3 at the front end of the upper frame 14.
8, the other end is attached to the bracket 40 between the left and right sides of the lower frame 18.
They are rotatably attached to each. In addition,
The shock absorber 36 has a known configuration, and its configuration is not the gist of the present invention, so it will not be described in detail.

The seat suspension device 10 of the present invention is equipped with a biasing mechanism 42 that applies an appropriate suspension force to the upper frame 14, that is, to the seated person. The biasing mechanism 42 includes, for example, biasing means 44 and is configured to be freely expandable and contractible in the front-rear direction.

As can be seen from FIGS. 1 and 3, the biasing mechanism 42 includes a mechanism body 46 in which a biasing means 44 is housed, for example. The mechanism main body 46 is formed of, for example, a pair of front plates 50 and rear plates 52 connected and fixed by a plurality of stepped bolts 48.

As shown in FIG. 3, the shoulder bolt 48 is
The shaft portion 48a is formed with a head 48b at one end and a threaded portion 48c at the other end, and the compression coil spring 4
3 at a predetermined angle around 4, for example, 120 degrees apart.
It is located at a location. Then, the stepped bolt 48 is inserted through the insertion hole 54 of the rear plate through which the shaft portion 48a can be inserted, and the threaded portion is extended through the insertion hole 56 of the front plate through which the threaded portion 48c can be inserted. By screwing the nuts 58, the front plate 50 is fixed to the stepped portion of the stepped bolt, thereby forming the mechanism body 46.

As shown in FIGS. 1 and 3, a slide plate 62 having a shaft 60 on one side, for example, in the front, is connected to the front plate 50 and the rear plate 5.
2 and is slidably supported by a stepped bolt 48.

As can be seen from FIG. 3, the slide plate 62 has an insertion hole 64 into which, for example, the shaft portion 50a of a stepped bolt can be loosely inserted, and the shaft 60 is fixed approximately at the center of the front surface. There is. Further, the shaft 60 of the slide plate is inserted into the insertion hole 66 of the front plate 50.
is extended forward through the. A biasing means 44 is disposed between the front plate 50 and the slide plate 62.

Here, the biasing means 44 is formed of a compression spring, for example, two compression coil springs arranged at a predetermined angle apart.

In such a configuration, the front plate 5
0, as the slide plate 62 slides in the front-rear direction between the rear plates 52, the extension length of the shaft 60 from the front plate changes, and the biasing mechanism 42
expands and contracts. For example, when the biasing mechanism 42 expands, the compression coil spring 44 is compressed, and the restoring force generated at the time of compression acts as a biasing force that tends to contract the biasing mechanism.
Occurs in compression coil springs.

The biasing mechanism 42 is installed, for example, between the movable end of the link 20 and the locking piece 68. As shown in FIGS. 1 and 2, for example, extending ends 70 extending upward are formed at the rear ends of the left and right side link arms 20b, and a support rod 72 is installed between the left and right extending ends. , is pivoted. A bracket 74 provided on the rear surface of the rear plate 52 is rotatably attached to the support rod 72, and a shaft 60 of the slide plate is connected to the locking piece 68 by a pivot pin 78 inserted into the insertion hole 76. The biasing mechanism 42 is pivotally connected to the link 20
It is attached between the movable end of the locking piece 68 and the locking piece 68 (see FIG. 3).

In the seat suspension device 10 of the present invention, the locking piece 68 is formed as an arm that is swingable in the front-rear direction, and the biasing force of the compression coil spring 44 can be adjusted by swinging the arm. has been done.

As shown in FIGS. 1 and 2, for example, an operating handle 8 is attached at one end between a pair of brackets 80 and 82 fixed to the front left side of the upper frame 14 in the seated state.
A lead screw 86 having a diameter of 4 is installed and pivotally supported, and a nut 90 having an extending pin 88 at the upper end is screwed onto the lead screw. And arm (locking piece) 68
One end is pivotally connected to, for example, a bracket 92 fixed to the right side of the upper frame 14 in the seated state, by a pivot pin 94, and an insertion hole 96 provided at the other end.
The extension pin 88 of the nut is inserted into. In other words,
The arm 68 is rotatably installed between a bracket 92 and a nut 90 of the upper frame.

In such a configuration, the lead screw 8
As the nut 90 rotates, the nut 90 is screwed forward (forward movement) and screwed back (
The arm 68 is swung around the pivot pin 94 by the backward movement), and the swiveling angle of the arm causes the biasing mechanism 4
By changing the length of the compression coil spring 2, the biasing force from the compression coil spring 44, that is, the suspension force of the seat 12 can be adjusted.

The arm insertion hole 96 into which the nut extension pin 88 is inserted is formed as a long hole extending in the longitudinal direction of the arm. In such a configuration, a deviation in the trajectory between the swinging of the arm 68 about the pivot pin 94 and the linear movement of the nut 90 in the axial direction of the lead screw 86 causes the nut to move in the elongated insertion hole 96. This is reliably compensated for by the movement of the extension pin 88.

In this configuration, for example, when the arm 68 swings rearward as the nut 90 is screwed back, the slide plate 62 is pressed rearward together with the shaft 60. Then, the front plate 50,
The distance between the slide plates 62 becomes wider, the biasing force from the compression coil spring 44 becomes smaller, and the suspension force of the upper frame 14, that is, the seat 12, is reduced.

Further, as the nut 90 is screwed forward, the arm 68 swings forward, and the slide plate 62 is pulled forward via the shaft. Then, due to the compression of the compression coil spring 44, the space between the front plate 50 and the slide plate 62 becomes narrower, and the compression coil spring 4
The biasing force from 4 is increased, and the suspension force of the seat 12 is increased.

As described above, according to the seat suspension device 10 of the present invention, a compression coil spring can be formed as the biasing means 44 without using a tension coil spring, and the source of the suspension force from the compression coil spring is The upper frame 14 is elastically supported via links 20. In other words, in this configuration, unlike known configurations that use tension coil springs as biasing means, there is no need to provide hooks for locking at both ends of the biasing means, so deformation of the hooks, Safety caused by damage etc. is definitely improved.

[0034] Both ends of the compression coil spring 44 are
Since the front plate 50 and the slide plate 62 come into contact with each other on their surfaces, the biasing force from the compression coil spring and the load acting on the compression coil spring are dispersed without being concentrated at one point. Therefore, the front plate 5
0. Deformation, damage, etc. of the slide plate 62 and the compression coil spring 44 are sufficiently prevented.

Furthermore, in the structure in which the slide plate 62 is slidably supported by the plurality of stepped bolts 48 of the mechanism body 46, parallelism between the front plate 50 and the slide plate can always be ensured. In other words, the biasing forces from the left and right compression coil springs 44 act equally, and as the biasing mechanism 42 expands, the compression coil springs are equally compressed, causing a difference in the biasing forces of the left and right compression coil springs. Not at all. Therefore, compression coil springs having the same biasing force can be used, and the configuration of the biasing mechanism 42, that is, the entire seat suspension device, does not become complicated.

In the embodiment, the suspension force from the compression coil spring can be adjusted by expanding and contracting the biasing mechanism 42 by swinging the arm 68 as the operating handle 84 is rotated. ing. but,
For example, the biasing mechanism 42 may be
The upper frame 14 may be constructed between the movable end of the frame 14 and a fixed locking piece, etc., and elastically support the upper frame 14 under a constant suspension force.

However, according to the configuration in which the suspension force by the compression coil spring can be adjusted as in this embodiment, the seated person can arbitrarily adjust the suspension force according to his or her preference, body weight, etc. Comfort and safety of the seated person can be ensured.

In the embodiment, the compression coil spring 44 is
Although they are arranged at two locations on the left and right sides, they are not limited to this, and may be arranged, for example, at locations apart in the vertical direction.

Furthermore, the number of compression coil springs 44 is not limited to two; for example, three or four springs may be arranged separated by a predetermined angle.

In the embodiment, the biasing means 44 is formed of two compression coil springs separated from each other on the left and right sides, but the biasing means 44 is not limited to this, and for example, as shown in FIGS. Additionally, the biasing means may be formed from two compression coil springs 98, 100 stacked on a concentric axis.

In such a configuration, the compression coil springs 98 and 100 are formed with a large diameter and a small diameter, respectively, and by housing the small diameter compression coil spring 100 within the large diameter compression coil spring 98, the compression coil springs 98 and 100 are arranged on the same axis. It is superimposed on The compression coil springs 98, 100 are housed and held between a front plate and a slide plate 162 within a mechanism main body 146 having a pair of front plates 150 and rear plates 152.

As shown in FIGS. 4 and 5, the front plate 150 and the rear plate 152 of the main body of the mechanism have, for example, a nut 58 attached to four stepped bolts 48 inserted through the insertion holes 54 and 56. Connected and fixed by screws. The shoulder bolts 48 are spaced apart by, for example, 90 degrees. Further, by inserting the stepped bolt 48 into the notch 102 and loosely inserting the shaft 60 into the insertion hole 66 of the front plate, the slide plate 162 is slidably supported between the front plate 152 and the rear plate 154. has been done.

A small-diameter compression coil spring 100 is disposed around the shaft 60 between the front plate 152 and the slide plate 162, and a large-diameter compression coil spring 98 is disposed via the stepped bolt 48. It is set up.

Even in this configuration, the suspension force from the compression coil springs 98, 100 is applied to the biasing mechanism 1.
42 to the upper frame 14, and the seated person is elastically supported under a predetermined suspension force. In other words, even if the biasing mechanism 142 having such a configuration is used, the same effects as those of the embodiment described above can be obtained, and the comfort, safety, etc. of the seated person can be ensured.

[0045] By arranging the compression coil springs 98 and 100 one on top of the other on the same axis, the biasing mechanism 142 can be configured to be relatively small, so that the seat suspension device 10
can be made smaller.

[0046] In the embodiment, the biasing means 44 is embodied as a compression coil spring, but is not limited thereto, and may be formed from other compression springs, such as bamboo springs, for example.

Further, although the seat suspension device 10 of the present invention is suitable for seats in automobiles, etc., it is not limited thereto, and may be installed, for example, in seats in trains, airplanes, ships, etc.

[0048] The above-mentioned embodiments are for explaining the present invention, and are not intended to limit the invention in any way.
It goes without saying that all modifications, modifications, etc. made within the technical scope of the present invention are also included in the present invention.

[0049]

[Effects of the Invention] As described above, according to the seat suspension device according to the present invention, suspension force is applied to the upper frame via the link by the biasing mechanism equipped with the biasing means made of a compression spring. There is. In other words, with such a configuration, there is no need to provide hooks for locking at both ends of the biasing means, so safety caused by deformation, breakage, etc. of the hooks is reliably improved.

In a configuration in which a slide plate slidably supported by a plurality of stepped bolts is disposed between the front plate and the rear plate, and a compression spring is disposed between the front plate and the slide plate, the compression spring Both ends of the front plate and slide plate contact each other with their surfaces. Therefore, the biasing force from the compression spring and the load acting on the compression spring are distributed without being concentrated on one point, and deformation, damage, etc. of the front plate, slide plate, and compression spring can be sufficiently prevented.

Furthermore, since the slide plate is slidably supported by the plurality of stepped bolts of the mechanism body, parallelism between the front plate and the slide plate can always be ensured. In other words, the biasing forces from the left and right compression springs act equally, and as the biasing mechanism expands, the compression springs are equally compressed, so that there is no deviation between the biasing forces of the left and right compression springs. Therefore, compression springs having the same biasing force can be used, and the configuration of the biasing mechanism, that is, the entire seat suspension device, does not become complicated.

[0052] In the structure in which two large and small compression coil springs are disposed concentrically around the shaft of the slide plate, the biasing mechanism can be configured to be relatively small, so that the seat suspension device can be miniaturized. I can't help it.

Furthermore, since the two compression coil springs are located on the same axis, the compression of the two compression coil springs and the transmission of biasing force can be made even more equal.

Furthermore, if the configuration is such that the suspension force from the compression spring can be adjusted by expanding and contracting the biasing mechanism by swinging the arm as the operating handle is rotated, the seated person can adjust the suspension force according to his or her preference, weight, etc. The suspension force can be adjusted as desired. Therefore, the comfort and safety of the seated person can be further ensured.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a seat suspension device according to the present invention.

FIG. 2 is a cross-sectional view along line A-A in FIG. 1;

FIG. 3 is a partially cutaway exploded perspective view of the biasing mechanism.

FIG. 4 is a partially cutaway exploded perspective view of a biasing mechanism in another embodiment of the invention.

FIG. 5 is a cross-sectional view along line BB in FIG. 4;

[Explanation of symbols] 10 Seat suspension device 12
Seat 14 Upper frame 18 Lower frame 20 Link 42 Biasing mechanism 44 Biasing means (compression coil spring) 46
Mechanism body 48 Stepped bolt 50 Front plate 52 Rear plate 60 Shaft 62 Slide plate 68 Locking piece (arm) 84 Operating handle 86 Lead screw 90 Nut

Claims (5)

[Claims] [Claim 1] A telescopic abbreviation X consisting of a link arm
The upper frame on which the sheet is placed is supported by the lower frame through the shaped link, and the suspension force from the biasing means installed and tensioned between the movable end of the link and the locking piece, In a seat suspension device that elastically supports a seat, the biasing means is formed of a compression spring, and the biasing mechanism, which accommodates the compression spring disposed at a predetermined location and expands as the compression spring is compressed, is connected to the movable end of the link. A seat suspension device constructed and stretched between a locking piece and a locking piece. 2. The biasing mechanism has a mechanism body in which a pair of front plates and a rear plate are connected and fixed by a plurality of stepped bolts, and a shaft extending to one side,
A slide plate is provided between the front plate and the rear plate, the shaft is extended to either the front plate or the rear plate, and the slide plate is slidably supported by a stepped bolt, and the biasing means includes a compression spring. is interposed between the front plate and the slide plate, and either the inner or outer circumference of the compression spring is supported by a plurality of stepped bolts, and as the compression spring is compressed, the shaft of the slide plate extends from the main body of the mechanism. The seat suspension device according to claim 1. 3. The biasing means comprises at least two biasing means arranged at a predetermined angle apart around the shaft of the slide plate.
The seat suspension device according to claim 2, wherein the seat suspension device is a compression coil spring. 4. The biasing means comprises at least two biasing means disposed concentrically and superimposed around the shaft of the slide plate.
The seat suspension device according to claim 2, wherein the seat suspension device is a compression coil spring. 5. A lead screw having an operating handle at its front end is pivotally supported so as not to be movable in the axial direction, and
5. The seat suspension according to claim 1, wherein the nut is screwed onto the lead screw, and the swing arm rotatably installed between the upper frame and the nut is formed as a locking piece of the biasing mechanism. Device.