JP2566709Y2 - Suspension seat - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vehicle seat and the like, in which a seat frame is elastically supported 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 obtained. The present invention relates to a suspension seat having a suspension function capable of relaxing and absorbing the above.

[0002]

2. Description of the Related Art For example, in a seat used for various vehicles such as a forklift, a seat is supported by 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 that is elastically supported so as to be vertically movable by a parallel link mechanism, a suspension spring, a shock absorber and the like is used.

That is, in such a conventional suspension seat, the seat cushion portion is provided directly on the floor of the vehicle body by a parallel link mechanism or indirectly via a slide mechanism, and is capable of moving up and down. And Further, a suspension spring is interposed between the seat cushion portion and a seat support portion such as a floor surface, so as to constantly apply a biasing force upward to the seat to the seat cushion portion,
A shock absorber is interposed between the seat cushion portion and the seat support portion, so that an external impact force can be elastically supported.

Further, a suspension adjusting mechanism capable of adjusting the elastic force of the suspension spring is provided, so that an appropriate supporting state can be obtained according to the preference and weight of the occupant and various situations. Are known.

[0005]

According to the above-described suspension seat, the shock absorber and the suspension spring, including the parallel link mechanism, are connected to the seat support such as the floor below the seat cushion in the seat. The structure was interposed between them. For this reason, in the conventional suspension seat, a certain amount of space must be secured between the seat cushion and the floor surface, and there are constraints on the height of the seat from the floor surface. The degree of freedom in design was small.

Further, in the conventional suspension seat,
As described above, since the shock absorber and suspension spring are provided in the limited space between the seat cushion and the floor, the suspension stroke is as small as about 30 to 40 mm, and the shock absorbing function of the shock absorber is sufficient. Could not be demonstrated.

[0007] Conventionally, in general, tension springs are used as suspension springs and provided on both sides of the seat due to the above-described restriction on the installation space, so that an upward urging force is applied to the seat supported by the parallel link mechanism. Was giving. Therefore, such a conventional suspension seat requires at least two or more springs, which not only has a practical problem in the number of parts and the assembling work, but also in adjusting the elastic force of such a suspension spring. , Two adjustments must be performed at the same time, and the adjustment operation is extremely complicated.

[0008] For this reason, for example, Japanese Utility Model Laid-Open Publication No. Sho 57-20242 discloses a technique in which a compression spring is used as a suspension spring, and the compression spring is coaxially combined with a shock absorber. However, in this conventional technique, the above-mentioned problem in the space between the seat cushion portion and the floor surface has not been solved yet.

Further, the above-mentioned hardness adjusting mechanism by adjusting the elastic force of the suspension spring is usually directly attached to the spring. Therefore, when adjusting the elastic force, the urging force of the suspension spring is applied to the operation lever and the like. Also, there was a problem that the operability was poor.

[0010] In addition, when the hardness adjusting mechanism for adjusting the elastic force is provided, it is necessary to adjust the magnitude of the elastic force of the suspension spring according to the weight and preference of the seated person. The value can be set freely and appropriately, and the urging force can be maintained at the set value so that the urging force does not fluctuate unnecessarily even in the event of a shock. There is.

For this reason, it is necessary to provide a scale for adjusting the elastic force of the suspension spring while visually recognizing the elastic force from the outside of the seat, or to provide a lock means for setting and locking the elastic force of the spring to a desired value. Conceivable. However, the provision of such scales and locking means increases the number of component parts, and it is inevitable and costly to assemble the parts.Take measures to solve such points. Is desired.

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 to solve a problem in a space between a seat cushion portion and a floor surface. At the same time, the shock absorber and suspension spring ensure a sufficient seat stroke, increase the degree of freedom in its design, and adjust the hardness of the suspension spring by the elastic force very easily and the weight of the occupant It is an object of the present invention to provide a suspension seat that can be adjusted to a desired size according to the user's preference and the like, can maintain the set state of the spring appropriately, is simple in structure and assembly, and is inexpensive.

[0013]

In order to meet such a demand, a suspension seat according to the present invention uses a compression spring extending vertically as a suspension spring, and uses the compression spring in the vertical direction of the shock absorbing shock absorber. And a spring receiver is screwed onto the upper end of the compression spring, and the screw position of the spring receiver is screwed into the threaded portion of the movable rod at the upper end of the spring receiver. A fixing nut that is rotated to adjust the elastic force of the compression spring by changing the fixing nut is fixed, and a vertically extending slit of a vertical scale fixed to the seat frame side is provided in a part of the spring receiver. A projection for projecting the projection toward the inside, a pointer for a scale for adjusting the elastic force of the compression spring, and a spring for maintaining the elastic force at a desired value. Characterized by being configured to function as a detent for only.

[0014]

According to the present invention, the seat frame is supported on the seat support by the parallel link mechanism so as to be movable up and down, and is coaxially combined with the vertically extending shock absorber provided on the back side of the seat back. The suspension spring is always elastically supported by the upward biasing force, and a shock absorber can secure a sufficient suspension stroke to buffer the impact force.

[0015] The hardness adjustment by the elastic force of the compression spring as the suspension spring is performed by rotating a screw formed on the upper end side of a vertically extending movable rod and a fixed nut provided on the upper end thereof. This can be achieved by changing the screwing position of the spring receiver below the nut up and down, so that the operability is excellent, and the spring receiver is provided at the position indicated by the scale provided in the vertical direction of the protrusion projecting from a part thereof. A desired value can be set while visually checking the adjustment state, and the projection of the spring receiver also functions as a detent, so that the required elasticity adjustment and locking at the set position are possible.

[0016]

1 to 4 show an embodiment of a suspension seat according to the present invention. In these drawings, the reference numeral 1 generally 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 continuously provided on the rear end side. Here, reference numeral 4 in FIG. 4 denotes a vehicle body floor on which the seat 1 is disposed, and 5 denotes a seat slide mechanism provided on the vehicle body floor 4 to support the seat 1 so as to be movable in the front-rear direction. As described above, it is composed of the fixed side rail 6 and the movable side rail 7.

Reference numeral 11 denotes a well-known parallel link mechanism which supports the seat cushion 2 in the above-described seat frame 10 on a slide mechanism 5 as a seat support so as to be vertically movable. However, FIG.
As shown in FIG. 4, it is provided between the support bracket 14, the bearings 15, 15 provided on the movable rail 7, and the seat cushion portion 2 of the seat frame 10. Here, reference numeral 16 denotes a support shaft portion of the rear link 13, and reference numerals 20 and 20 denote mounting and fixing the bearings 15, 15 to the rear end of the movable rail 7 constituting the seat slide mechanism 11. Mounting bracket for

As is clear 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. However, the details are well known and a specific description is omitted. Further, other members constituting the sheet are appropriately provided at required positions as conventionally known.

In the suspension seat 1 as described above, as is apparent from FIGS. 1 to 4, a parallel link mechanism 11 including a pair of front and rear links 12 and 13 is provided.
A vertically extending compression spring 21 is used as a suspension spring that constantly applies an upward biasing force to a seat frame 10 that is vertically movably supported by a slide mechanism 5 as a seat supporting portion. Rod 22 of shock absorber 22 for
a, the shock absorber 22 is provided coaxially with the seat frame 10 and the shock absorber 22 is attached to the seat frame 1 on the back side of the seat back portion 3 of the seat frame 10.
0 and a part of the rear link 13 constituting the parallel link mechanism 11 and an arm part 23 provided integrally with the support shaft part 16 of the rear link 13 so as to extend vertically.

Now, according to the present invention, the seat frame 1
A compression spring 21 as a suspension spring that constantly applies an upward biasing force to the compression spring 21 is provided coaxially with a movable rod 22a extending in the vertical direction of a shock absorber 22 for absorbing shock. The spring receiver 30 is connected to the screw portion 22b on the upper end side of the movable rod 22a.
The fixed nut 31 is fixed to the threaded portion 22b of the movable rod 22a at the upper end side of the spring receiver 30 with a set screw 31a, and the screwed position is changed by the turning operation of the fixed nut 31. Compression spring 21
As shown in FIGS. 1 (a) and 1 (b), a scale 34 is provided on the seat frame 10 so that the elastic force can be adjusted. The bracket 33 has a slit 33a extending in the up-down direction of the bracket 33, so that the pointer for the scale 34 provided in the up-down direction for adjusting the elastic force of the compression spring 21 and the elastic force can be maintained at a desired value. Spring support 30
It is characterized in that it is configured to have a function as a detent.

According to such a configuration, the hardness of the compression spring 21 as a suspension spring is adjusted by the elastic force by adjusting the screw portion 22b formed on the upper end side of the movable rod 22a extending in the vertical direction to the upper end portion thereof. By rotating the fixing nut 31 provided at the bottom, the screwing position of the spring receiver 30 below the nut 31 can be changed up and down, and the resistance due to the spring biasing force as in the related art is small, and the operability is excellent. In addition, the spring receiver 30 can be set to a required value while visually confirming the adjustment state at a designated position of a scale 34 provided in a vertical direction of a projection 32 protruding from a part thereof. Reference numeral 32 also functions as a detent, and the required elasticity adjustment and locking at the set position are possible.

As shown in FIG. 2, the bracket 33 having such a scale 34 is provided to be exposed at the upper end on the rear side of the seat back portion 3 and is fixed to the screw portion 22b at the upper end of the movable rod 22a. The fixing nut 31 is provided so as to be rotatable from the outside, and the scale 34 provided in the vertical direction can be indicated by the projection 32 of the spring receiver 30 exposed to the outside through the slit 33a extending in the vertical direction. ing.

Here, in the figure, reference numeral 24 denotes a stay for fixedly supporting the bracket 33 at the upper end thereof. The stay 24 is provided upright on the seat frame 10 similarly to the seat back portion 3. A detailed description of the components and the like of the suspension seat 1 other than those described above is omitted here.

Further, according to the above-described configuration, the seat frame 10 is vertically movably supported by the parallel link mechanism 11 on the slide mechanism 5 which is a seat support, and the shock provided on the back side of the seat back 3 is provided. Absorber 2
A compression spring 21 which is a suspension spring coaxially combined with the spring 2 is always elastically supported by an upward biasing force, and a shock absorber 22 secures a sufficient suspension stroke to cushion an impact force. Can be.

Therefore, according to such a configuration, the suspension stroke is required and sufficiently provided by the shock absorber 22 with the compression spring 21 which can be disposed on the back side of the seat back portion 3 with a sufficient length in the vertical direction. As a result, it is possible to achieve a suspension function, and it is possible to obtain a soft ride feeling for a seated person. Further, the shock absorber 22
The degree of freedom in setting the compression spring 21 and the compression spring 21 can be increased, the elastic support state of the seat 1 can be adjusted arbitrarily, and it is possible to cope with the preference of the occupant.

That is, in such a configuration, the vertical length of the shock absorber 22 is increased, its suspension stroke is increased as compared with the conventional one, and the speed of the movable rod 22 at the time of absorbing the shock is increased to improve the damping performance. It can be relatively improved. In particular, in 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.

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 so as to extend in the vertical direction, the seat cushion portion 2 and the slide mechanism serving as the seat support portion are provided. 5 or body floor 4
Can be minimized and the degree of freedom in design can be increased. Further, according to such a configuration, the load at the time of absorbing the impact acts almost on the rear link 13 side in the parallel link mechanism 11, and there is also an advantage that it is preferable to provide strength only on the rear link 13 side.

The present invention is not limited to the structure of the embodiment described above, and it goes without saying that the shape, structure, etc. of each part can be appropriately modified or changed. For example, in the above-described embodiment, the movable rod 22 extending in the vertical direction of the shock absorber 22 is provided.
Although the case where the fixing nut 31 is fixed to the threaded portion 22b at the upper end a is illustrated, it is needless to say that an operation lever or the like may be provided so that the turning operation can be easily performed. or,
Although not shown and described in detail, appropriate washers, bearings, resin bushes, and the like may be provided on both ends of the spring receiver 30.

Further, the above-mentioned bracket 33 and scale 3
4 is not limited to the above-described integral structure, and for example, as shown in FIGS. 5A and 5B, a cover member 35 having a scale 34 provided in a vertical direction is attached to the bracket 33 as a separate member. It may be configured as follows.

In the above-described embodiment, the seat slide mechanism 5 for supporting the seat 1 movably in the front-rear direction by the shock absorber 22 formed by coaxially combining the parallel link mechanism 11 and the compression spring 21 as a spring. Although the case in which the sheet 1 is interposed is described above, it is needless to say that the sheet 1 may be interposed between the seat 1 and the floor 4 supporting the sheet 1. Further, in the above-described embodiment, the case where the compression spring 21 as the suspension spring is assembled on the upper side of the seat 1 of the shock absorber 22 is exemplified. However, the present invention is not limited to this, and the upside down may be used. is there.

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

[0032]

As described above, according to the suspension seat of the present invention, a compression spring extending vertically is used as a suspension spring, and the compression spring is connected to a movable rod extending vertically of the shock absorbing shock absorber. The compression spring is provided coaxially in combination, and a spring receiver is screwed to the upper end of the compression spring, and the screwing position of the spring receiver is changed to the threaded portion of the movable rod at the upper end side of the spring receiver. A fixed nut that is rotated to adjust the elastic force of the fixed nut, a part of the spring receiver,
A protrusion is provided projecting into a vertically extending slit of a vertically provided scale fixed to the seat frame side, and the protrusion is provided with a pointer to a scale for adjusting an elastic force of a compression spring and the elasticity. Although it is configured to function as a detent for a spring receiver for maintaining the force at a desired value, despite the simple structure, there is a vertically extending compression spring provided on the back side of the seat back. With the shock absorber, the suspension stroke can be secured as necessary and sufficient, and the suspension function is demonstrated.
It is possible to obtain a soft ride feeling, further increase the degree of freedom in setting shock absorbers and compression springs,
The elastic support state of the seat can be arbitrarily adjusted, and it is possible to cope with a seated person's preference and the like.

According to the present invention, the hardness of the suspension spring is adjusted by the elastic force of the compression spring. The fixed nut provided on the upper end of the movable rod extending vertically is provided on the upper end of the movable rod. The operation is extremely easy by changing the screwing position of the spring receiver below the nut, and the operability is excellent. In addition, this spring receiver is provided in the vertical direction of the protrusion projecting from a part thereof. It is possible to set the required value while visually checking the adjustment state at the designated position of the scale, and the projection of this spring receiver also functions as a detent, enabling the required elasticity adjustment and locking at the set position, A suspension seat capable of freely adjusting the elastic force of the compression spring can be obtained.

In particular, according to the present invention, the spring stopper which is a problem when adjusting the elastic force of the compression spring, and the scale provided in the vertical direction which is a guide when the elastic force is arbitrarily set. Are integrated, there is an advantage that the number of components can be reduced, assemblability can be improved, and cost can be further reduced.

[Brief description of the 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 its II.
Line sectional view.

FIG. 2 is a schematic perspective view of the suspension seat as viewed from the rear 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 an assembled state of FIG. 3;

FIG. 5 illustrates another embodiment of the present invention.
5 is an enlarged perspective view of a main part, and FIG.

[Explanation of symbols]

 DESCRIPTION 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 Support shaft part 21 Compression spring (Suspension spring) 22 Shock absorber 22a Movable rod 22b Screw part 23 Arm 24 Stay 30 Spring receiver 31 Fixing nut 32 Projection 33 Bracket 33a Slit 34 Scale 35 Cover member

Claims (1)

(57) [Scope of request for utility model registration] 1. A parallel link mechanism for vertically supporting a seat frame with a pair of front and rear links with respect to a seat support portion, a suspension spring for constantly applying an upward biasing force to the seat frame, and a shock absorbing member. An arm provided integrally with a part of an upper end side of the seat frame on the back side of the seat back portion of the seat frame and a support shaft portion of a rear link constituting the parallel link mechanism. In the suspension seat provided interposed between the
A vertically extending compression spring is used as the suspension spring, and the compression spring is provided coaxially with a vertically movable rod of the shock absorbing shock absorber, and a spring receiver is screwed on the upper end of the compression spring. At the same time, a fixed nut that is turned to fix the elastic force of the compression spring by changing the screwing position of the spring receiver is fixed to the threaded portion of the movable rod at the upper end side of the spring receiver, A protrusion is provided on a part of the spring receiver so as to project into a vertically extending slit of a vertically provided scale fixed to the seat frame side, and the protrusion is a scale for adjusting elastic force of a compression spring. A suspension seat which is configured to function as a guide for the spring and a detent for a spring receiver for maintaining the elastic force at a desired value.