JP2788176B2 - Seat support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat support structure useful for a vehicle, particularly a work vehicle or a vehicle traveling on rough terrain.

[0002]

2. Description of the Related Art In recent years, there has been a tendency for ride comfort to be emphasized not only in passenger cars but also in working vehicles.

[0003] However, in the case of a working vehicle, due to the nature of the vehicle, no suspension device is provided on the vehicle itself, or even if the vehicle is provided, the suspension device is usually set to be harder. When a seat having a cushioning effect of a degree mounted on the vehicle is used, the seat is not comfortable for the occupant.

For this reason, conventionally, such a working vehicle has adopted a seat support structure in which a suspension device is provided on a seat itself to improve ride comfort.
4-221234, JP-A-4-116238). More specifically,
In the case of 4-221234, the seat pedestal and the seat body portion located above it are connected up and down freely via a scissors-type link mechanism, and the center connection shaft serving as the connection axis of this scissors-type link mechanism and the above A shock absorber consisting of a fluid pressure cylinder and a coil spring is disposed between the seat pedestals. Further, in the case of Japanese Patent Application Laid-Open No. 4-116238, when arranging the shock absorber, a part of the seat body is dug upward, and the portion dug above the seat body is linked to the scissors-type link mechanism. The shock absorber was vertically disposed between the lower end and the seat pedestal at the same height.

[0005] In both cases, the vehicle body side on which the seat pedestal is formed and the seat body portion on which the occupant sits are made into another "mass (mass system)" in a vibration system, and vibration is caused between each "mass". It was designed to improve ride comfort by interposing shock absorbers that reduce and absorb the impact.

In addition, the distance between the links of the scissors-type link mechanism is adjusted so that the height of the seat body can be adjusted according to the physique of the occupant.

[0007]

However, in the case of the above-described conventional seat supporting structure, the vertical stroke of the seat body cannot be increased due to the arrangement of the shock absorber. As a result, when traveling on rough terrain, a sufficient buffer effect cannot be obtained,
Alternatively, a relatively large capacity shock absorber must be used, and the structure is complicated,
It became heavier in weight and more expensive.

Further, since the length of the shock absorber changes when the height of the seat body is adjusted, there is a disadvantage that if the height is adjusted according to the physique, the riding comfort also changes uniquely. In other words, the height of the seat body should be adjusted according to the physique of the occupant, and even though the riding comfort should be changed depending on the road surface conditions etc. There was an inconvenience.

The present invention has been made in view of such a situation, and a first object of the present invention is to provide a large-sized seat body with a large stroke amount, to use a small-sized shock absorber, and to further improve the structure. It is a further object of the present invention to provide a simple vehicle seat support structure, and a further object of the present invention is to provide a vehicle seat support structure in which the height of the seat body and the ride comfort (action of a shock absorber) can be adjusted without cooperation. It is to be.

[0010]

According to a first aspect of the present invention, there is provided a seat support structure for connecting a seat pedestal and a seat body portion located above the seat pedestal via a scissors-type link mechanism, and connecting the seat pedestal to a portion below the seat pedestal. By vertically disposing a shock absorber between the seat body and the seat body, the seat body can be raised and lowered with respect to the seat pedestal.
In the seat support structure configured to adjust the seat height , the shock absorber is connected to a hydraulic cylinder.
With a coil spring around the outer periphery of the
And the total length of this coil spring
Adjustable by adjusting means in the longitudinal direction of the body pressure cylinder
In addition , a shock absorber lower end support bracket is provided below the seat pedestal via an extension member extending so that the shock absorber is located at the center of the seat, and serves as the center of the seat. A bracket for supporting the upper end of the shock absorber is provided on the seat body, and the shock absorber is disposed between the two brackets.

Further, in the above invention, the shock absorber
A flange is formed at the upper end of the hydraulic cylinder of the bushover
While locking the upper end of the coil spring,
A thread is formed at the lower end of this hydraulic cylinder.
In addition, a furan with an internal thread
By screwing the threaded part, the above coil spring
That locks the lower end of
A female thread is screwed into the male thread on the inner periphery below the threaded part.
By screwing the locking member, the lower flange
If the overall length of the shock absorber is changed by adjusting the height of the seat body, the length of the coil spring can be adjusted to the lower flange by adjusting the height of the seat body. lever is moved in the vertical direction, it is possible to obtain a desired ride seat support structure.

Further, in the above invention, the seat body portion includes an upper frame directly supporting the seat body,
The upper frame is configured to support the upper frame, the upper frame is configured to be slidable in the front-rear direction of the seat with respect to the lower frame, and engaging means capable of restraining the front-rear direction movement is provided. The seat body can be adjusted in the front-rear direction according to the physique of the occupant.

Further, in the above invention, the seat pedestal is integrated with a seat body portion above the seat pedestal, and the front and lower portions of the scissors-type link mechanism (refer to front and lower positions).
Is configured to be rotatable forward around the vicinity of the support point, the adjustment of the adjusting means can be easily performed in a state where the entire seat is rotated forward.

[0014]

According to the seat support structure of the present invention, the load acting on the central portion of the seat is received by the shock absorber without substantially eccentricity in the vertical direction. Becomes smaller.
Therefore, a shock absorber having a small capacity can be used, and the structure can be simplified, so that the weight can be reduced.

According to the mode of use of the shock absorber, it is possible to use a shock absorber with a large stroke amount, and if the coil spring of the shock absorber is configured to be adjustable by the adjusting means as described above, the height of the seat body is increased. Even if the height is adjusted to a desired height according to the physique of the occupant, a desired riding comfort can be obtained.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a seat supporting structure according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a plan view of FIG. 1 with a seat removed.

In FIG. 1, reference numeral 1 denotes a seat body having a seat S at an upper portion, and a seat pedestal 2 is disposed below the seat body 1. The seat body 1 and the seat pedestal 2 are connected so as to be able to move up and down by a scissors-type link mechanism 3 provided in a pair of left and right. Each of the left and right link mechanisms 3 is of a scissors type, that is, a scissors shape (X
) And two link members 3A and 3B of equal length connected by pins 3C so as to form a link member 3A.
The right end of the link member 3B is pivotally attached to a bracket 22 formed from the seat pedestal 2 by a pivot bolt 3D. The right end of the link member 3B in FIG. 1 is formed to project from the seat body 1 by a pivot shaft 3K. Bracket 10
Is pivoted to. The left end of the link member 3A in FIG. 1 is pivotally attached to the moving member 3F via a bracket 3E fixed to a cross member 9 'connecting the left and right link members 3A, as shown in FIG. Both ends of the cross member 9 'are connected to each other by bolts 3L, and the both ends of the cross member 9' are channel-like rails 3J 'via rollers 3G'.
It is movably held inside. The left end in FIG. 1 of the link member 3B is movably held in a channel steel-shaped rail 3J via a roller 3G and a pin 3H. As shown in FIG. 2 and described above, the left and right ends of the left and right link members 3A are integrally connected by a cross member 9 ', and the left and right link members 3B The right ends are connected by pipes 9 at the pivot shafts 3K, and the pivot shafts 3K pass through the pipes 9. As a result, as described above, the link members 3A and 3B and the seat body 1 or the seat pedestal 2 are pivotally connected to each other so as to be able to move up and down.

As shown in FIG. 2, the rails 3J arranged on the left and right are connected by a pipe 11.

As shown in FIG. 3, the moving member 3F is integrally fixed to a nut 12 screwed to a lifting / lowering adjusting screw 4 disposed in the front-rear direction of the seat body portion 1. As shown in FIG. 2, the rail member 1A is held movably back and forth within a channel-shaped member (slide member 1B) provided on both sides of the seat body portion 1 so as to face each other.

As shown in FIGS. 1 to 3, a vertically bent adjusting handle 5 is disposed at the base end (left end in FIG. 1, lower end in FIG. 3) of the elevating screw 4. Have been.

As shown in FIG. 2 or FIG. 3, the seat body 1 has a rail member 1A and a rail member 1A.
Has a slide member 1B slidably covered on the top,
The sheet S is placed and fixed on the slide member 1B.

On the side (left side in FIGS. 2 and 3) of the slide member 1B, an engaging portion 6A and a gripping portion 6B, which constitute the engaging means, are provided at the distal end and the proximal end, respectively. The engaging rod 6 is provided, and the sliding member 1B and the rail member 1A are formed with engaging holes 7 provided at the same interval with which the engaging portions 6A engage.

As shown in FIG. 3, the engagement rod 6 is connected to the slide member 1B via a bracket 13.
And the gripping portion 6B of the engaging rod 6 is pulled by the tension type coil spring 8 toward the slide member 1B, that is, the engaging portion is released. 6A is held in a state of engagement with the engagement hole 7 (see the solid line in FIG. 3 and FIG. 2).

As shown in FIG. 1 or FIG. 2, the seat pedestal 2 is arranged in the front-rear direction so as to face the seat body 1 vertically in parallel with the seat body 1 as shown in FIG. The lower pipe 9 and the pipe, which are disposed so as to be orthogonal to the extending pipe 14 in a plan view,
11 and the rails 3J provided at both ends of the pipe 11 are provided. The seat pedestal 2 is configured to horizontally support the lower ends of the link members 3A and 3B.

At the tip (left end in FIG. 1) of the pipe 14, as shown in FIG. 1, a channel-shaped member 15 is disposed so that its groove-side opening 15a faces downward. 3 is engaged with the distal end of a pipe 16 bent leftward at the distal end in FIG. 3 constituting the frame of the vehicle body so as to cover the distal end of the pipe 16 as shown in FIG. By being fastened with the bolts 24, the tip of the pipe 14 is rotatably supported by the pipe 16.

The base end (right end in FIG. 1, upper end in FIG. 3) of the pipe 14 is fixed to a frame pipe 23 connecting left and right sheets, and is shown in FIG. 1 from the bottom of the frame pipe 23. As described above, the pipe 17 extends obliquely downward, the pipe 18 extends downward from the pipe 14, and a bracket 19 for pivotally connecting the lower end of the shock absorber 21 is provided at the lower end thereof. The pipe 18 is hidden behind the shock absorber 21 in FIG.

The front end (the right end in FIGS. 2 and 3) of the frame pipe 23 is placed above the base end of the pipe 16, and the channel-like member 15 (the pipe
(16 tips), frame pipe 23, pipe 17, 18
, The seat body 1, the seat pedestal 2, and the shock absorber 21 are configured to be rotatable forward (counterclockwise in FIG. 1; see arrow A).

As shown in FIGS. 1 and 2, a bracket 20 is provided on the rail member 1A side, and a shock absorber 21 is provided between the bracket 20 and the bracket 19. . Therefore, the seat body 1 and the seat pedestal 2 which are connected to be able to move up and down by the scissors-type link mechanism 3 as described above are supported by the shock absorber 21 in the vertical direction. That is, the shape of the link mechanism 3 is determined by the degree of expansion and contraction of the shock absorber 21.

In the case of the present embodiment, as shown in FIG.
Are displaced from the position of the pin 3C of the scissors-type link mechanism 3. Specifically, the shock absorber
Reference numeral 21 denotes a central portion of the seat S, and pins 3C are located at a slightly rearward position.

Further, the shock absorber 21 is provided in FIG.
As shown in FIG. 1, a coil spring 21B is provided around a hydraulic cylinder (hydraulic cylinder in this embodiment) 21A. The upper end of the coil spring 21B is formed at the upper end of the hydraulic cylinder 21A. Flange (not shown)
The lower end is abutted and locked by a flange member 21C screwed to the lower end of the hydraulic cylinder 21A.
A female screw is screwed on the inner periphery of the flange member 21C, and a screw is screwed on the outer periphery of the hydraulic cylinder 21A, so that the flange member 21C moves up and down with respect to the hydraulic cylinder 21A. Is movably screwed. Below the flange member 21C, a lock member 21D having an internal thread on the inner periphery for fixing the flange member 21C to the hydraulic cylinder 21A is similarly screwed. With this configuration, the flange member is
By raising and lowering 21C, the coil spring 21
The sprinkling force of B can be adjusted.

Thus, the seat supporting structure thus configured has the following effects in use. That is, in the state shown in FIG.
When the user grips the gripping portion 6B (see FIGS. 2 and 3) of the engagement rod 6 and operates the engagement rod 6 sideways as shown by the two-dot chain line in FIG. Rail member 1A
Is released, the slide member 1B is moved back and forth in accordance with its own physique, and if it can be set, when the grip portion 6B is released, the engagement rod 6 is in a state shown by a solid line in FIG. If the sheet S is slightly moved back and forth in this state, the engagement portion 6A
Are engaged with the engagement holes 7, and the sheet S is fixed in the front-rear direction.

Next, the height of the seat S is adjusted by turning the lifting / lowering adjustment handle 5 clockwise or counterclockwise. When the lifting handle 5 is turned to the right or left in this manner, the moving member 3F moves back and forth with respect to the rail member 1A, and the angle of the scissors-type link mechanism 3 (the angle between the link members 3A and 3B).
Changes, and the height of the sheet S can be adjusted.

After the adjustment of the seat S in the front-rear direction and the height is completed, the hardness of the shock absorber 21 is adjusted. That is, as described above, when the height of the seat S is adjusted, the adjustment changes the hardness of the shock absorber 21 with the change in the overall length of the shock absorber 21. And adjust to the desired hardness. More specifically, the lock member 21D shown in FIG. 1 is loosened, and the flange member 21C is raised and lowered to adjust the spring force of the coil spring 21B to a desired strength. At this time, since the above adjustment has to be performed at a position below the seat S, an undesired working posture is forced.
In the case of the present embodiment, when the rear portion of the sheet S is gripped and lifted upward as shown by the arrow A in FIG.
Rotates counterclockwise around the channel-shaped member 15 (pipe 16) in FIG. 1 together with the seat body portion 1, the seat pedestal 2, the shock absorber 21, etc. The hardness of the absorber 21 can be adjusted.

According to the seat support structure of this embodiment, a desired posture and a desired riding comfort for the occupant can be obtained.

Further, since the shock absorber is located at the center of the seat as described above, the load of the occupant does not act eccentrically on the shock absorber, so that a small-capacity shock absorber can be used.

Further, since a shock absorber having a long overall length can be used, the stroke amount of the seat body can be increased, and a good riding comfort can be obtained even when traveling on rough terrain.

[0038]

According to the seat support structure of the present invention, since the shock absorber is arranged as described above, a shock absorber having a long overall length can be used. As a result, the stroke amount of the seat body becomes large. As a result, a good ride quality can be obtained even in rough terrain.

Further, since the shock absorber is arranged at the center of the seat, a shock absorber having a small capacity and a small diameter can be used because an unbalanced load does not act on the shock absorber. The structure can be simplified, the cost can be reduced, and the weight of the seat portion can be reduced.

Further, since the height of the seat body and the ride comfort (action of the shock absorber) can be adjusted independently of each other without coordination, the optimum seat setting in terms of position and hardness can be achieved. can get.

[Brief description of the drawings]

FIG. 1 is a partially sectional side view showing a configuration of a seat support structure according to an embodiment of the present invention.

FIG. 2 is a partially sectional front view showing the configuration of the seat support structure of FIG.

FIG. 3 is a plan view of FIG. 1 in a state where a sheet is detached and partially cut away.

[Explanation of symbols]

 S: Seat 1: Seat main body 2: Seat base 3: Link mechanism 17: Pipe (extended member) 18: Pipe (extended member) 19: Bracket 21: Shock absorber

Claims (4)

(57) [Claims] 1. A seat pedestal and a seat main body portion located above the seat pedestal are connected via a scissors-type link mechanism, and a shock absorber is vertically disposed between a lower portion of the seat pedestal and the seat main body portion. Sea by enabling lifting the sheet body portion relative to the seat base
In the seat support structure configured so that the height can be adjusted , the shock absorber is mounted on the outer periphery of the fluid pressure cylinder.
To be configured with coil springs
In addition, the total length of this coil spring is
Adjustably constituted by longitudinally adjusting means, and, downward from the seat base, through the extending member the shock absorber is extended so as to be located at the center portion of the sheet, the shock absorber lower supporting bracket A seat support structure, wherein a shock absorber upper end support bracket is provided in a seat body portion serving as a central portion of the seat, and the shock absorber is disposed between the two brackets. 2. The hydraulic cylinder of the shock absorber.
Form a flange at the upper end of the coil spring
And a screw is formed at the lower end of the hydraulic cylinder.
In addition, a furan with an internal thread
By screwing the threaded part, the above coil spring
The lower end of the male screw is locked and the male screw is screwed below the male screw.
Screwing a lock member with an internal thread on the inner circumference to screw into the screw
By lowering the lower flange to the hydraulic cylinder
Claims characterized by being adjustable up and down with respect to
2. The seat supporting structure according to 1. 3. The seat body portion includes an upper frame that directly supports the seat body and a lower frame that supports the upper frame, and the upper frame is slidable with respect to the lower frame in the front-rear direction of the seat. 2. The seat supporting structure according to claim 1, wherein said seat supporting structure is provided with an engagement means capable of restraining the movement in the front-rear direction. 4. The seat pedestal is integrally rotatable with a seat body portion above the seat pedestal so as to be rotatable forward about a pivot shaft near a support point at the front / bottom of the scissors-type link mechanism. The seat support structure according to claim 1, wherein: