JPH0584529U - Suspension seat - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a simple and inexpensive suspension seat in which the elastic force of a suspension spring can be adjusted according to the weight of a seated person and the like, and the set state of the elastic force can be maintained. A compression spring 21 as a suspension spring is provided coaxially with a movable rod 22a of a shock absorber 22 for shock absorption. The spring bearing 30 is screwed onto the upper end of the compression spring, and the screw portion 22b of the movable rod is rotated on the upper end side of the compression spring to change the screwing position of the spring bearing to adjust the spring elastic force. The fixing nut 31 is fixed. Furthermore, in a part of the spring bearing,
A protrusion is provided so as to face the slit 33a on the scale 34 side fixed to the seat frame 10 side. This allows
It functions as a guide for the scale for adjusting the elastic force of the compression spring and as a detent for the spring bearing for maintaining the elastic force at a desired value.

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 supporting portion such as a floor surface of a vehicle body or a seat slide mechanism provided on the floor surface. A suspension seat having a structure in which it is elastically supported by a suspension spring and a shock absorber so as to be vertically movable is used.

That is, in such a conventional suspension seat, the seat cushion portion thereof is provided directly on the floor surface of the vehicle body by a parallel link mechanism or indirectly via a slide mechanism, and is vertically movable. It is configured. 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 also to provide the seat cushion portion with the seat support portion. A shock absorber was interposed between the shock absorbers to elastically support the impact force from the outside.

In addition, a hardness adjusting mechanism that can adjust the elastic force of the suspension spring is additionally provided, so that a suitable supporting state according to the preference and weight of the seated person and various situations can be obtained. Are known.

[0005]

[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. For this reason, in the conventional suspension seat, it is necessary to secure a space between the seat cushion and the floor surface to some extent, and the height of the seat from the floor surface is constrained. The degree of freedom in design was small.

Further, in the conventional suspension seat, as described above, 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. To a small extent, it was not possible to fully exert the shock absorbing function of the shock absorber.

Further, conventionally, due to the above-mentioned restrictions on the assembling space, tension springs are used as suspension springs, and by providing these on both sides of the seat, upward biasing force is applied to the seat supported by the parallel link mechanism. Was being given. Therefore, such a conventional suspension seat requires at least two springs, which is not only a practical problem in the number of parts and assembling work, but also adjusts the elastic force of the suspension spring. In doing so, the two work had to be done at the same time, and there was the drawback that the adjustment work was extremely complicated.

Therefore, for example, Japanese Utility Model Laid-Open No. 57-20242 discloses a suspension spring in which a compression spring is used, and the compression spring is coaxially combined with and intervened. However, with this conventional technique, the problem of the space between the seat cushion portion and the floor surface has not been solved yet.

Further, since the hardness adjusting mechanism by adjusting the elastic force of the suspension spring described above is usually attached directly to this spring, when the elastic force is adjusted, the urging force of the suspension spring is applied to the operation lever or the like. There was also the problem of poor operability.

Further, in order to attach the hardness adjusting mechanism by adjusting the elastic force, it is necessary to determine the magnitude of the elastic force of the suspension spring according to the weight and preference of the seated person. Can be set freely and appropriately, and the biasing force can be maintained at the set value so that the lock state can be set so that the biasing force does not fluctuate unnecessarily even if a shock is applied. Sometimes.

For this reason, a scale is provided that allows the elastic force of the suspension spring described above to be adjusted while visually recognizing it from the outside of the seat, and a locking means that can set and lock the elastic force of the spring to a desired value is provided. It is possible. However, providing such a scale or locking means leads to an increase in the number of component parts, and it is unavoidable to assemble and costly.It is necessary to take some measures to solve such a point. Is desired.

The present invention has been made in view of the above circumstances, and a suspension mechanism for elastically supporting a seat frame is simply and appropriately configured to solve a problem in a space between a seat cushion portion and a floor surface. At the same time, it is possible to secure a sufficient seat stroke with the shock absorber and suspension spring, and to increase the degree of freedom in designing it.Furthermore, it is extremely easy to adjust the hardness by the elastic force of the suspension spring, and it is very easy for the seated person. The purpose is to obtain a suspension seat that can be adjusted with a desired size according to weight, taste, etc., and that the set state of the spring can be appropriately maintained, the structure and assembly are simple, and the cost is low. ..

[0013]

[Means for Solving the Problems]

 In order to meet such demands, the suspension seat according to the present invention has a compression spring as a suspension spring that constantly applies an upward biasing force to the seat frame and is coaxially combined with a movable rod of a shock absorber for shock absorption. Installed on the upper end side of the compression spring, and the fixed nut is fixed to the threaded portion of the movable rod at the upper end side of the spring receiver. By making it possible to adjust the elastic force of the compression spring by a spring bearing whose screwing position changes, and by letting a protruding portion protruding from a part of the spring bearing face a slit of a scale fixed to the seat frame side, Provided with a pointer for adjusting the elastic force of the compression spring and a function as a detent for the spring bearing for maintaining the elastic force at a desired value. It is obtained by sea urchin configuration.

[0014]

[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. By this, it is always elastically supported by the upward biasing force, and the shock absorber can secure a sufficient suspension stroke to buffer the impact force.

In addition, the hardness of the compression spring as a suspension spring is adjusted by elastic force by rotating a fixed nut provided at the upper end of a screw portion formed at the upper end of the movable rod. This can be done by changing the screwing position of the lower spring bearing, and has excellent operability.In addition, this spring bearing is set to the required value while visually checking the adjustment state at the indicated position on the scale of the protruding portion In addition, the protrusion of this spring receiver also functions as a detent, enabling the required elastic force adjustment and locking at the set position.

[0016]

【Example】

 1 to 4 show an embodiment of a suspension seat according to the present invention. In these drawings, the reference numeral 1 designates 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 that is continuously provided on a rear end side of the seat cushion portion 2. Here, reference numeral 4 in FIG. 4 is a vehicle body floor surface on which the seat 1 is disposed, and 5 is a seat slide mechanism which is provided on the vehicle body floor surface 4 and which supports the seat 1 so as to be movable in the front-rear direction. As described above, the fixed side rail 6 and the movable side rail 7 are configured.

Reference numeral 11 is a well-known parallel link mechanism for supporting the seat cushion portion 2 in the seat frame 10 described above so as to be vertically movable on a slide mechanism 5 serving as a seat support portion, and a pair of front and rear links 12, 13 are provided. As shown in FIGS. 3 and 4, it is provided between the support bracket 14, the bearings 15 and 15 provided on the movable side rail 7, and the seat cushion portion 2 of the seat frame 10. Here, 16 in the drawing is a support shaft portion of the rear link 13, and 20 and 20 in the drawing are mounted and fixed to the rear ends of the movable side rails 7 constituting the seat slide mechanism 11. It is a mounting bracket for

As is apparent from FIG. 3, the seat frame 10 is provided with a seat cushion panel 17 and a seat back side pipe frame 18, and the slide mechanism 5 is provided with a slide lock means 19 and the like. Although attached, its details are well known and will not be described in detail. Further, other materials constituting other seats are appropriately attached at required positions as is well known in the art.

Further, in the suspension seat 1 as described above, as apparent from FIGS. 1 to 4, the parallel link mechanism 11 including the pair of front and rear links 12 and 13 allows the slide mechanism as the seat support portion. A compression spring 21 is used as a suspension spring that constantly applies an upward biasing force to the seat frame 10 that is vertically movable on the vehicle 5, and is fitted to the movable rod 22a of the shock absorber 22 for shock absorption. This shock absorber 22 is provided coaxially with this, and the shock absorber 22 is provided on the rear side of the seat back portion 3 of the seat frame 10 and a part of the upper end of the seat frame 10 to form a parallel link mechanism 11. It is interposed between the support shaft portion 13 and the arm portion 23 provided integrally with the support shaft portion 13.

According to the present invention, the compression spring 21 as a suspension spring that constantly applies an upward biasing force to the seat frame 10 is coaxial with the movable rod 22a of the shock absorber 22 for shock absorption. And the spring receiver 30 at the upper end of the compression spring 21 is screwed into the threaded portion 22b at the upper end side of the movable rod 22a to be attached. The fixing nut 31 is fixed to the portion 22b with a setscrew 31a, and the elastic force of the compression spring 21 can be adjusted by the spring receiver 30 whose screwing position is changed by the rotating operation of the fixing nut 31. As is apparent from FIGS. 1 (a) and 1 (b), a protrusion 32 protruding from a part of the bracket 30 is attached to the seat frame 10 side. By having the spring 33 face the inside of the spring 33a, it has a pointer to the scale 34 for adjusting the elastic force of the compression spring 21 and a function as a detent for the spring bearing 30 for maintaining the elastic force at a desired value. It has a feature in that it is configured to be.

[0021] According to such a configuration, in order to adjust the hardness by the elastic force of the compression spring 21 as the suspension spring, the screw portion 22b formed on the upper end side of the movable rod 22a is provided on the upper end portion thereof. This can be done by changing the screwing position of the spring receiver 30 below the nut 31 by rotating the fixing nut 31, and the resistance due to the spring biasing force as in the conventional case is small, and the operability is excellent, and this spring The receiver 30 can be set to a desired value while visually checking the adjustment state at the indicated position of the scale 34 of the protrusion 32 provided on a part thereof, and the protrusion 32 of the spring receiver 30 also functions as a detent. The required elastic force adjustment and its locking at the set position are possible.

As is apparent from FIG. 2, the bracket 33 having the scale 34 is exposed at the upper end of the seat back portion 3 on the back side and is fixed to the screw portion 22b at the upper end of the movable rod 22a. The fixing nut 31 is rotatably operated from the outside, and at the same time, the scale 34 can be indicated by the protrusion 32 of the spring receiver 30 exposed to the outside through the slit 33a.

Reference numeral 24 in the drawing denotes a stay for fixing and supporting the bracket 33 to the upper end portion, which is provided upright on the seat frame 10 similarly to the seat back portion 3. Detailed description of the components of the suspension seat 1 other than those described above will be omitted here.

Further, according to the above-mentioned configuration, the seat frame 10 is supported by the parallel link mechanism 11 on the slide mechanism 5 which is a seat supporting portion so as to be vertically movable, and is provided on the rear side of the seat back portion 3. The compression spring 21, which is a suspension spring coaxially combined with the shock absorber 22, is elastically supported by the upward biasing force at all times, and the shock absorber 22 secures a sufficient suspension stroke to provide an impact force. Can be buffered.

Therefore, according to such a configuration, the suspension stroke is necessary and sufficient by the shock absorber 22 with the compression spring 21 that can be arranged on the back side of the seat back portion 3 with a sufficient length. It is possible to achieve 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 22 and the compression spring 21 can be increased, the elastic support state of the seat 1 can be arbitrarily adjusted, and the preference of the seated person can be dealt with.

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

Further, in this embodiment, since the shock absorber 22 with the compression spring 21 is provided on the back 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. 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 only the rear link 13 side should have strength. is there.

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 fixed nut 31 is fixed to the threaded portion 22b at the upper end of the movable rod 22a of the shock absorber 22. However, an operation lever or the like is attached so that the turning operation can be performed easily. Of course, you can do that. Although detailed illustration and description are omitted, appropriate washers, bearings, resin bushes and the like may be provided on both ends of the spring bearing 30.

Further, the bracket 33 and the scale 34 described above are not limited to the above-mentioned integrated structure, and for example, as shown in FIGS. 5A and 5B, the cover member 35 having the scale 34 is a separate member. Alternatively, the bracket 33 may be assembled.

In the above-described embodiment, the seat slide mechanism 5 that supports the seat 1 so as to move the seat 1 in the front-rear direction is provided with the shock absorber 22 formed by coaxially combining the parallel link mechanism 11 and the compression spring 21 as a spring. 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 is needless to say 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 21 as the suspension spring is assembled to the upper side of the seat 1 of the shock absorber 22 is illustrated, but the invention is not limited to this, and the top and bottom may be reversed. Is.

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 thereto. Needless to say.

[0032]

As described above, according to the suspension seat of the present invention, the suspension spring and the shock absorbing member which constantly apply upward biasing force to the seat frame supported by the parallel link mechanism so as to be vertically movable. It is installed coaxially with the shock absorber for the vehicle, and this shock absorber is connected to a part of the seat frame upper end side on the rear side of the seat back part and an arm part provided on the spindle part of the rear link of the parallel link mechanism. A compression spring as a suspension spring is provided in combination with the movable rod of the shock absorber for shock absorption coaxially, and a spring bearing is screwed onto the upper end of the compression spring. Adjust the elastic force of the compression spring by changing the screwing position of the spring receiver on the screw part of the movable rod at the upper end side of the spring receiver. For fixing the elastic force of the compression spring, a fixing nut that is rotated to fix the compression spring is fixed, and a protrusion that faces the slit of the scale member that is fixed to the seat frame Since it is configured to function as a guide for the scale and a detent for the spring receiver to maintain the elastic force at a desired value, the structure of the back of the seat back part is reduced despite the simple structure. The shock absorber with a compression spring provided on the side allows you to secure a necessary and sufficient suspension stroke, to exert a suspension function, and to obtain a soft riding comfort. The degree of freedom in setting the compression spring can be increased, the elastic support state of the seat can be arbitrarily adjusted, and the seated person's preference can be dealt with.

Further, according to the present invention, the hardness is adjusted by the elastic force of the compression spring as the suspension spring, and the threaded portion formed on the upper end side of the movable rod is rotated by the fixed nut provided on the upper end portion. It can be operated very easily by changing the screwing position of the spring receiver under the nut, and it has excellent operability.In addition, this spring receiver can be adjusted at the indicated position on the scale of the protrusion partly protruding from it. It can be set to the required value while visually checking it, and the protrusion of this spring receiver also functions as a detent, allowing the required elastic force adjustment and locking at that set position, and the elastic force of the compression spring. You can get a suspension sheet that can be adjusted freely.

In particular, according to the present invention, the detent of the spring bearing, which is a problem when adjusting the elastic force of the compression spring, and the scale that is a guide when setting the elastic force are integrated. Since it is configured as described above, there is an advantage that the number of constituent parts can be omitted, the assemblability can be improved, and the cost can be further reduced.

[Brief description of drawings]

FIG. 1 shows an embodiment of a suspension seat according to the present invention, (a) is an enlarged perspective view of a main part, and (b) is a sectional view taken along line I-I thereof.

FIG. 2 is a schematic perspective view of the suspension seat as viewed from the back side.

FIG. 3 is a schematic exploded perspective view of the entire suspension seat according to the present invention.

FIG. 4 is a schematic side view showing the assembled state of FIG.

5A and 5B are views for explaining another embodiment of the present invention, in which FIG. 5A is an enlarged perspective view of a main part, and FIG. 5B is a sectional view taken along line VV.

[Explanation of symbols]

 1 Vehicle Seat (Suspension Seat) 2 Seat Cushion Part 5 Seat Slide Mechanism 10 Seat Frame 11 Parallel Link Mechanism 12 Front Link 13 Rear Link 16 Spindle Part 21 Compression Spring (Suspension Spring) 22 Shock Absorber 22a Movable Rod 22b Screw Part 23 Arm part 24 Stay 30 Spring receiver 31 Fixing nut 32 Protrusion part 33 Bracket 33a Slit 34 Scale 35 Cover 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. And a shock absorber, which is integrally provided on a support shaft portion of a rear link forming a part of the seat frame upper end side on the back side of the seat back portion of the seat frame and the parallel link mechanism. In the suspension seat that is provided between the
A compression spring is used as the suspension spring,
The compression spring is provided so as to be coaxially combined with the movable rod of the shock absorber for shock absorption, and a spring bearing is screwed onto the upper end of the compression spring, and the screw portion of the movable rod is attached to the upper end side of the spring bearing. A slit of a scale fixed to the seat frame side by fixing a fixing nut that is rotated to adjust the elastic force of the compression spring by changing the screwing position of the spring receiver. A protrusion protruding toward the inside is provided so as to function as a pointer for a scale for adjusting the elastic force of the compression spring and to function as a detent for a spring receiver for maintaining the elastic force at a desired value. Suspension seat that is characterized by