JP2569437Y2 - 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, the seat is parallel-linked to a seat support 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 mechanism, a suspension spring, a shock absorber, and the like is used.

[0003] 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 can be moved 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 to constantly apply a biasing force to the seat cushion portion upward of the seat, and to apply a force between the seat cushion portion and the seat support portion. In this configuration, a shock absorber is interposed, and the impact force from the outside can be elastically supported. In addition, an adjustment mechanism that adjusts the elastic force of the suspension spring is attached,
An appropriate support state according to a seated person's preference and various situations was obtained.

[0004]

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. Therefore, it is necessary to secure a certain amount of space between the seat cushion and the floor surface, and there are constraints on the height of the seat from the floor surface, and the degree of freedom in designing the seat arrangement position and the like is small. Was something.

In such a conventional suspension seat, a shock absorber and a suspension spring are provided in a limited space between the above-mentioned seat cushion and the floor, so that the suspension stroke is about 30 to 40 mm. Thus, the shock absorbing function of the shock absorber could not be sufficiently exhibited.

Further, conventionally, due to the above-described restriction on the installation space, a tension spring is used as a suspension spring and provided on both sides of the seat to apply an upward urging force to the seat supported by the parallel link mechanism. Was giving. Therefore, at least two springs are required on the left and right sides, and there are problems in the number of parts and assembly work, and when adjusting the elastic force of these springs, two springs must be performed at the same time, which makes the adjustment work extremely complicated. Had disadvantages.

For this reason, for example, Japanese Utility Model Laid-Open No. 57-20242 discloses that a compression spring is used as a suspension spring.
It is also known that this is interposed coaxially with a shock absorber, but this conventional technique still does not solve the above-described problem in the space between the seat cushion portion and the floor surface. Was something.
In addition, the adjustment mechanism of the suspension spring is usually directly attached to this spring, so that when the elastic force is adjusted, the urging force of the suspension spring is applied to the operation lever and the like, which has a disadvantage that the operability is poor. .

An object of the present invention is to simply and appropriately configure a suspension mechanism for elastically supporting a seat frame, to solve a problem particularly in a space between a seat cushion portion and a floor, and to use a shock absorber and a suspension spring. The seat stroke can be sufficiently secured,
It is an object of the present invention to provide a suspension seat that can increase the degree of freedom in its design and can adjust the elastic force of the suspension spring very easily.

[0009]

In order to meet such demands, a suspension seat according to the present invention is provided with a parallel link mechanism for supporting a seat frame to be vertically movable by 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 absorber for absorbing shock. And a suspension seat interposed between an arm and an arm integrally provided on a support shaft of the rear link constituting the parallel link mechanism, wherein a compression spring is used as the suspension spring, and the compression spring is used as the suspension spring. Provided in coaxial combination with the movable rod of the shock absorber, the upper part of the movable rod The screw portion is formed integrally, the upper end of the screw portion is formed to protrude upward from the upper end of the seat back, and the upper end portion of the screw portion is fixed to the upper end portion of the bracket member fixed to the seat frame side. A spring receiving member is attached to each of an upper end and a lower end of the compression spring, and a nut screwed to a screw portion of the movable rod is disposed above the spring receiving member. It is characterized in that the elastic force of the compression spring can be adjusted by moving the nut screwed into the screw portion up and down.

[0010]

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

Further, when adjusting the elastic force of the suspension spring, if the upper end of the screw portion formed on the movable rod is rotated, the nut screwed to this screw portion moves up and down. Since the spring receiving member disposed below the nut also moves at the same time, the elastic force of the compression spring whose upper end is pressed by the spring receiving member can be adjusted, and the operability can be significantly improved.

[0012]

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 vehicle seat which characterizes the present invention. As is well known, the seat 1 includes a seat frame 10 including a seat cushion 2 and a seat back 3 continuously provided on a rear end side. Here, reference numeral 4 denotes a vehicle body floor on which the seat 1 is disposed, and 5 denotes a vehicle body floor 4
A seat slide mechanism provided on the upper side to support the seat 1 movably in the front-rear direction.
And a movable-side rail 7.

The parallel link mechanism 11 is a seat frame 10
In this, the seat cushion 2 is vertically movably supported on a slide mechanism 5 as a seat support.
A pair of front and rear links 12 and 13 are provided on a support bracket 1 provided on a movable rail 7 as shown in FIG.
4 and 15 and the seat cushion 2 of the seat frame 10. Here, in FIG.
Is a support shaft of each of the links 12 and 13. Also, the lengths of the links 12, 13 need not be the same.

As 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 slide lock means and the like. The details are well known, and a detailed description thereof will be omitted. Further, as a matter of course, the members constituting the other sheets and the like are appropriately provided at required positions, as is well known in the related art.

As is apparent from FIG. 2, the seat frame 10 is provided with a bracket member 24 that stands upright like the seat back portion 3, and the upper end 25 of the bracket member 24 fixes the tip of the movable rod 22 of the shock absorber 21. Have been.
The lower end of the shock absorber 21 is rotatably connected to arm portions 23, 23 integrally protruding from a central portion of a shaft member constituting the support shaft portion 17 of the rear link 13. Further, a compression spring 20 used as a suspension spring is wound around a movable rod 22 of the shock absorber 21 and
And are provided coaxially.

With this configuration, the seat frame 10 is supported by the parallel link mechanism 11 on the slide mechanism 5 so as to be movable up and down, and is coaxially combined with a shock absorber 21 provided on the back side of the seat back 3. The compression spring 20, which is a suspension spring, is always elastically supported by an upward biasing force, and a shock absorber 21 can secure a sufficient suspension stroke to buffer an impact force.

According to such a configuration, the compression spring 20 which can be disposed with a sufficient length on the back side of the seat back portion 3 is provided.
With the shock absorber 21 provided, a suspension stroke can be required and sufficiently ensured, and a suspension function can be exhibited, whereby a soft ride feeling can be obtained for a seated person. Furthermore, 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 adjusted arbitrarily, and it is possible to cope with the preference of the occupant.

A screw portion 26 is integrally formed on the upper part of the movable rod 22 of the shock absorber 21, and the upper end of the screw portion 26 is connected to the bracket member 24 via a screw nut 27 and a nut housing 28. It is fixed to the upper end 25. The screw portion 26 is formed so that the upper end protrudes upward from the upper end of the seat back 3, and the occupant can use the screw portion 26 (movable rod 22) as described later.
Can be rotated. The screw 26
The upper end may be shaped so that it can be easily operated, or an operation lever or the like may be appropriately attached.

At the upper end and the lower end of the compression spring 20, spring receiving members 31, 32 are attached, respectively.
Are supported and fixed at upper and lower positions, respectively. Each of the spring receiving members 31 and 32 is inserted through the movable rod 22 or the screw portion 26. The lower end of the spring receiving member 32 is omitted, and the lower end of the compression spring 20 is moved to the movable rod 22.
It can also be locked and fixed to a projection, flange, or the like formed integrally with the device.

Above the spring receiving member 31 at the upper end of the compression spring 20, a nut 35 screwed to the screw portion 26 of the movable rod 22 is provided. In the present embodiment, two nuts 35 are provided at the top and bottom, but it is sufficient that at least one nut 35 is provided at least above the spring receiving member 31 at the upper end.
Here, in FIG. 1, reference numeral 34 denotes the compression spring 20 and the spring receiving member 3.
In FIG. 2, reference numerals 1 and 32 denote a washer disposed between the spring receiving member 31 and the nut 35. Although not shown, the spring receiving member 3 at the upper end is not shown.
A resin, a bearing, and the like are arranged between the first and the washer so that the turning operation of the screw portion 26 can be performed smoothly.

With the above configuration, the movable rod 22
If the upper end of the screw portion 26 is rotated and the nut 35 is moved up and down, the compression spring 20, the upper end of which is pressed by the spring receiving member 31, expands and contracts, and its elastic force can be easily and quickly adjusted. It is. At this time, the nut 35 is in a fixed state by receiving the urging force of the compression spring 20 always upward through the spring receiving member 31, and thus the nut 35 is vertically moved by the rotation of the screw portion 26 to which the nut 35 is screwed. The thing that moves to. Further, since the urging force of the compression spring 20 is merely transmitted indirectly to the screw portion 26 via the nut 35 and the like, and is applied orthogonally to the operation direction of the screw portion 26,
The operability is improved, and the adjustment of the elastic force of the compression spring 20 becomes extremely easy.

As shown in FIG. 3, in the present embodiment, a pin 41 is integrally provided at the rear end of the upper spring receiving member 31, and the pin 41 is provided on the back side of the seat back portion 3 in a guide groove. 43. A scale 45 is displayed on the side of the guide groove 43 so that the vertical position of the nut 35 and the spring receiving member 31, that is, the degree of elastic force of the compression spring 20, can be visually recognized from the outside.

FIG. 4 shows a modification of the present invention.
This modified example is different from the above-described embodiment in a configuration or the like in which the upper end of the screw portion 26 is fixed to the seat frame 10 side. In this modification, one nut 35 is disposed above the spring receiving member 31, and two nuts 57 are disposed above the spring receiving member 31 by being screwed to the screw portion 26, and the upper end 55 of the bracket member 24. And rubber members 53 are disposed above and below. Here, reference numeral 59 denotes a bearing.

Also in this configuration, the nut 35 and the spring receiving member 31 are moved from the uppermost position shown by the solid line to the intermediate position and the lowermost position shown by the imaginary line in FIG. Thus, the elastic force of the compression spring 20 can be adjusted steplessly and simply and quickly. In this modification, the spring receiving member 3 is provided in the same manner as in the above embodiment.
Of course, it is also possible to integrally protrude the pin 41 or to provide the rotation-stopping member 34 at 1.

[0025]

As described above, according to the suspension seat of the present invention, a parallel link mechanism for vertically supporting the seat frame by a pair of front and rear links with respect to the seat support portion, A suspension spring for constantly applying an upward biasing force, and a shock absorber for absorbing shock, wherein the shock absorber is provided on a rear side of a seat back portion of the seat frame, at a part of an upper end side of the seat frame, in parallel with the In a suspension seat interposed between an arm portion integrally provided on a support shaft portion of a rear link constituting a link mechanism, a compression spring is used as the suspension spring, and the compression spring is used as a movable rod of the shock absorber. And coaxially combined with each other. The upper end of the screw portion is formed so as to protrude upward from the upper end of the seat back, the upper end of the screw portion is fixed to the upper end of a bracket member fixed to the seat frame side, and the upper end of the compression spring A spring receiving member is attached to the lower end, and a nut screwed to the screw portion of the movable rod is disposed above the spring receiving member. The nut is screwed to the screw portion of the movable rod at the upper end position of the seat back. The elastic force of the compression spring can be adjusted by moving the nut up and down, so despite the simple structure, the suspension stroke can be reduced by the shock absorber with the compression spring provided on the back side of the seat back. Required and sufficient, the suspension function can be exerted, and a soft ride feeling can be obtained. It can be increased the degree of freedom on setting the compression spring.

When the upper end of the threaded portion formed on the movable rod is rotated, the nut screwed to this threaded portion moves up and down, and the spring receiving member disposed below the nut is simultaneously moved. Because of the movement, it is possible to obtain a suspension seat capable of easily and quickly adjusting the elastic force of the compression spring whose upper end is pressed by the spring receiving member.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing one 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 perspective view of the suspension seat shown in FIG. 1;

FIG. 4 is a side view of a main part showing a modification of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle seat (suspension seat) 5 Seat slide mechanism 10 Seat frame 11 Parallel link mechanism 12 Front link 13 Rear link 20 Compression spring (Suspension spring) 21 Shock absorber 22 Movable rod 23 Arm part 24 Bracket member 25 Upper end part 26 Screw part 27 Screw nut 28 Nut housing 31 Spring receiving member 32 Spring receiving member 35 Nut 41 Pin 43 Guide groove 53 Rubber member 55 Upper end 57 Nut

Claims (1)

(57) [Scope of request for utility model registration] 1. A parallel link mechanism for supporting a seat frame 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. The shock absorber is provided integrally on a part of the upper end side of the seat frame on the back side of the seat back portion of the seat frame and on a support shaft portion of a rear link constituting the parallel link mechanism. The suspension seat provided between the arm
Using a compression spring as the suspension spring,
The compression spring is provided coaxially with the movable rod of the shock absorber, and a screw portion is integrally formed on the upper portion of the movable rod, and the upper end of the screw portion projects upward from the upper end of the seat back. The upper end of the screw portion is fixed to the upper end of the bracket member fixed to the seat frame side, and the spring receiving members are respectively attached to the upper end and the lower end of the compression spring, and the movable member is mounted on the upper portion of the spring receiving member. The elastic force of the compression spring can be adjusted by disposing a nut screwed on the screw portion of the rod and moving the nut screwed on the screw portion of the movable rod up and down at the upper end position of the seat back. A suspension seat characterized by being configured as described above.