JPH0518972U - Suspension sheet - Google Patents

Abstract

(57) [Summary] [Purpose] To minimize the space between the floor of the suspension seat and the suspension stroke, and ensure the shock absorbing function. [Structure] A seat frame 10 is supported by a seat support portion 5 so as to be vertically movable by a parallel link mechanism 11 including a pair of front and rear links 12 and 13. A compression spring 20 is used as a suspension spring that applies an upward biasing force to this seat frame, and is provided coaxially with a shock absorber 21 for shock absorption. The shock absorber is provided on the rear side of the seat back portion 3 between the part 25 on the upper end side of the seat frame and the arm portion 23 provided on the support shaft portion 17 of the rear link forming the parallel link mechanism.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention elastically supports the seat frame of a vehicle seat or the like in a vertically movable state by a parallel link mechanism, a suspension spring, and a shock absorber, so that external vibrations and shocks can be alleviated and absorbed. The present invention relates to a suspension seat having a suspension function.

[0002]

[Prior Art]

 For example, in a seat used for various vehicles such as a forklift, etc., the seat has a parallel link mechanism with respect to a seat surface, such as a floor surface of a vehicle body and a seat slide mechanism provided on the floor surface. A suspension seat is used, which has a structure in which it is elastically supported by a suspension spring and a shock absorber so that it can move up and down.

That is, in such a conventional suspension seat, the seat cushion portion is provided on the floor surface of the vehicle body directly by the parallel link mechanism or indirectly through the slide mechanism so as to be vertically movable. I am trying. Further, a suspension spring is interposed between the seat cushion portion and a seat support portion such as a floor surface to constantly apply an urging force to the seat cushion portion above the seat, and at the same time, the seat cushion portion and the seat support portion are separated from each other. A shock absorber was interposed between them to elastically support the impact force from the outside.

[0004]

[Problems to be solved by the device]

 By the way, according to the above-described suspension seat, the structure including the parallel link mechanism, the shock absorber and the suspension spring is provided below the seat cushion part of the seat and between the seat support part such as the floor surface. there were. In such a structure, it is necessary to secure a certain amount of space between the seat cushion and the floor surface, and there are restrictions on the height of the seat from the floor surface. The degree of freedom above was small.

Further, in such a conventional suspension seat, since the shock absorber and the suspension spring are provided in the limited space between the seat cushion and the floor surface, the suspension stroke is about 30 to 40 mm. Thus, the shock absorbing function of the shock absorber could not be fully exerted.

In addition, conventionally, due to the above-mentioned restrictions on the assembling space, tension springs are used as suspension springs, and by installing these on both sides of the seat, the tension springs are attached upward to the seat supported by the parallel link mechanism. Since it gives power, it requires at least two or more springs, and there was a problem in terms of practical use such as the number of parts and assembly work.

Therefore, for example, Japanese Utility Model Laid-Open No. 57-20242 discloses a suspension spring in which a compression spring is used, and the suspension is coaxially combined with and intervened with the shock absorber. However, with this conventional technique, the problem of the space between the seat cushion portion and the floor surface described above is still not solved, and it is desired to take some measures to eliminate such problems. .

The present invention has been made in view of such circumstances, and a suspension mechanism for elastically supporting a seat frame is simply and appropriately configured, and in particular, there is a problem in a space between a seat cushion portion and a floor surface. In addition to solving the problem, the objective is to obtain a suspension seat that can secure a sufficient seat stroke by the shock absorber and the suspension spring and increase the degree of freedom in design.

[0009]

[Means for Solving the Problems]

 In order to meet such demands, the suspension seat according to the present invention constantly applies an upward biasing force to a seat frame supported by a seat support portion so as to be vertically movable by a parallel link mechanism including a pair of front and rear links. A compression spring is used as the suspension spring to be provided, and it is installed coaxially with the movable rod of the shock absorber for shock absorption. It is provided so as to be interposed between a part of the parallel link mechanism and an arm portion that is integrally provided on the support shaft portion of the rear link.

[0010]

[Action]

 According to the present invention, the seat frame is supported by the parallel link mechanism on the seat supporting portion so as to be movable up and down, and is also combined with the shock absorber provided on the back side of the seat back portion so as to be coaxial with the suspension spring. It is elastically supported by the upward biasing force at all times, and the shock absorber can secure a sufficient suspension stroke to absorb the impact force.

[0011]

【Example】

 1 to 3 show an embodiment of a suspension seat according to the present invention. In these drawings, the reference numeral 1 denotes a suspension seat as a vehicle seat characterizing the present invention. As is well known, the seat 1 includes a seat frame 10 including a seat cushion portion 2 and a seat back portion 3 continuously provided on the rear end side of the seat cushion portion 2. Here, in the figure, 4 is a vehicle body floor surface on which the seat 1 is arranged, and 5 is a seat slide mechanism which is provided on the vehicle body floor surface 4 and supports the seat 1 so as to be movable in the front-rear direction. , A fixed side rail 6 and a movable side rail 7.

The parallel link mechanism 11 supports the seat cushion portion 2 in the seat frame 10 so as to be vertically movable on a slide mechanism 5 as a seat support portion. A pair of front and rear links 12 and 13 are provided as shown in FIG. 2, it is provided between the support brackets 14 and 15 provided on the movable side rail 7 and the seat cushion portion 2 of the seat frame 10. Here, reference numerals 16 and 17 in the drawing are spindle portions of the links 12 and 13. The lengths of the links 12 and 13 do not have to be the same.

As is apparent from FIG. 2, the seat frame 10 is provided with a seat cushion panel and a seat back pipe, and the slide mechanism 5 is provided with a slide lock means and the like. However, the details are well known, and a detailed description thereof will be omitted. Further, it is needless to say that other members constituting the seat are appropriately attached at required positions, as is well known in the art.

According to the present invention, in the suspension seat 1 as described above, the parallel link mechanism 11 including the pair of front and rear links 12 and 13 supports the slide mechanism 5 as a seat support so as to be vertically movable. A compression spring 20 is used as a suspension spring that constantly applies an upward biasing force to the seat frame 10, and is fitted coaxially with a movable rod 22 of a shock absorber 21 for shock absorption. The shock absorber 21 is provided integrally with the rear portion of the seat back portion 3 of the seat frame 10 and a part of the upper end side of the seat frame 10 and the support shaft portion 17 of the rear link 13 forming the parallel link mechanism 11. It is characterized in that it is interposed between the arm portion 23 and the arm portion 23.

Here, in this embodiment, as is apparent from FIG. 2, a bracket member 24 that is erected in the same manner as the seat back portion 3 is provided on the seat frame 10, and an upper end portion 25 of the bracket member 24 is provided with the shock absorber 21. The tip of the movable rod 22 is provided via a screw nut or a nut housing. Further, the lower end portion of the shock absorber 21 is rotatably connected to the arm portions 23, 23 integrally projecting from the central portion of the shaft member constituting the support shaft portion 17 of the rear link 13. Further, spring bearings are provided at both ends of the compression spring 20. The description of these parts and other parts is omitted here.

According to the above-mentioned configuration, the seat frame 10 is supported on the slide mechanism 5 by the parallel link mechanism 11 so as to be vertically movable, and is coaxially assembled with the shock absorber 21 provided on the back side of the seat back portion 3. The combined compression spring 20 is elastically supported by the upward biasing force at all times, and the shock absorber 21 can secure a sufficient suspension stroke to buffer the impact force.

Therefore, according to such a configuration, the shock absorber 21 with the compression spring 20 that can be arranged on the back side of the seat back portion 3 with a sufficient length ensures a necessary and sufficient suspension stroke. This makes it possible to exert a suspension function, which makes it possible to provide a seated person with a soft riding comfort. Further, the degree of freedom in setting the shock absorber 21 and the compression spring 20 can be increased, the elastic support state of the seat 1 can be arbitrarily adjusted, and the seated person's preference and the like can be dealt with.

That is, in such a configuration, the length of the shock absorber 21 is lengthened, the suspension stroke thereof is increased as compared with the conventional case, and the moving speed of the movable rod 22 at the time of shock absorption is increased to improve the damping performance. It can be relatively improved. In particular, with such a structure, the stroke amount of the seat 1 can be easily amplified and reduced, which is advantageous in setting the shock absorber 21 and the compression spring 20.

To briefly explain this with reference to FIG. 3, the length of the rear link 13 in the parallel link mechanism 11 is A, and the length of the arm portion 23 integrally provided on the rear link 13 via the support shaft portion 17 is B. By setting the lever ratio (B / A) with the rear link 13 of the arm portion 23 arbitrarily, the suspension stroke amount Y by the shock absorber 21 with the compression spring 20 with respect to the stroke amount x of the seat 1 Is as follows: Here, when the stroke amount of the seat 1 is x, the stroke amount y of the arm portion 23 with respect to the rear link 13 due to the lever ratio (B / A) is (B / A) x, and thus Y = X + y = x + (B / A) x. In other words, the shock absorber 21 with the compression spring 20 for obtaining the suspension function has a suspension stroke amount Y that is the sum of the seat stroke amount x and the stroke amount y at the arm portion 23 from the length indicated by L in the figure. It will be easily understood that the suspension stroke amount Y can be freely set by the lever ratio with the arm portion 23 of the link 13.

Further, according to the present invention, since the shock absorber 21 with the compression spring 20 is provided on the rear side of the seat back portion 3, the seat cushion portion 2 and the slide mechanism 5 which is the seat supporting portion and the vehicle body floor. There is an advantage that the space between the surface 4 and the surface 4 can be minimized and the degree of freedom in design can be increased. Further, according to such a configuration, in the parallel link mechanism 11, the load at the time of impact absorption is mostly applied to the rear link 13 side, and there is also an advantage that it is preferable to give strength only to the rear link 13 side.

It is needless to say that the present invention is not limited to the structure of the above-described embodiment, and the shape, structure, etc. of each part can be appropriately modified and changed. For example, in the above-described embodiment, the shock absorber 21 formed by coaxially combining the parallel link mechanism 11 and the compression spring 20 as the suspension spring is used as the seat slide mechanism 5 that supports the seat 1 so as to be movable in the front-rear direction. Although the case where the seat 1 is provided between the seat 1 and the floor surface 4 supporting the seat 1 is described, it goes without saying that the seat 1 may be provided between the seat 1 and the floor surface 4. Further, in the above-described embodiment, the case where the compression spring 20 as the suspension spring is assembled on the upper side of the seat 1 of the shock absorber 21 is illustrated, but the present invention is not limited to this, and the top and bottom may be reversed. It is a thing.

Further, the suspension seat 1 characterizing the present invention as described above is effective when applied to a vehicle using a simplified seat such as a forklift or a rear seat of a normal vehicle, but is not limited to this. Needless to say.

[0023]

As described above, according to the suspension seat of the present invention, the suspension spring that constantly applies the upward biasing force to the seat frame supported by the seat supporting portion so as to be movable up and down through the parallel link mechanism. A compression spring is used for this purpose, and it is installed coaxially with the shock absorber for shock absorption, and this shock absorber is supported on the rear side of the seat back and a part of the upper end of the seat frame and the rear link of the parallel link mechanism. Despite the simple structure, the shock absorber with compression spring provided on the back side of the seat back part requires a sufficient suspension stroke because it is provided so as to be interposed between the arm part provided on the shaft part and the arm part. It is possible to secure a comfortable ride feeling by exerting the suspension function. It is also possible to increase the degree of freedom in setting shock absorbers and compression springs, and to adjust the elastic support state of the seat arbitrarily, so that it is possible to deal with seated person's preferences etc. There is.

Further, according to the present invention, since the shock absorber with the compression spring is provided on the back side of the seat back portion, the space between the seat cushion portion and the seat support portion is minimized. This has the advantage that the degree of freedom in design can be increased.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of a suspension seat according to the present invention.

FIG. 2 is a schematic exploded perspective view of the entire suspension seat shown in FIG.

FIG. 3 is a schematic diagram for explaining the movement of the suspension seat shown in FIG.

[Explanation of symbols]

 1 Vehicle Seat (Suspension Seat) 2 Seat Cushion 3 Seat Back 4 Body Floor 5 Seat Slide Mechanism 10 Seat Frame 11 Parallel Link Mechanism 12 Front Link 13 Rear Link 14 Support Bracket 15 Support Bracket 16 Spindle 17 Spindle 20 compression spring (suspension spring) 21 shock absorber 22 movable rod 23 arm 24 bracket member

Claims (1)

[Scope of utility model registration request] 1. A parallel link mechanism for supporting a seat frame so as to be vertically movable by a pair of front and rear links with respect to a seat supporting portion, a suspension spring for constantly applying an upward biasing force to the seat frame, and a shock absorbing member. In the suspension seat including the shock absorber, a compression spring is used as the suspension spring, and the shock absorber is provided coaxially with the movable rod of the shock absorber. The suspension seat is characterized in that it is provided between a part of an upper end side of the seat frame and an arm portion integrally provided on a support shaft portion of a rear link constituting the parallel link mechanism.