JPH0420676Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seat suspension device provided in a seat of a vehicle or the like.

[Conventional technology]

2. Description of the Related Art The driver's seat of a passenger car, truck, etc. is equipped with a seat suspension device that elastically supports the seat to absorb vibrations during driving and provide comfortable sitting comfort.

An example of a conventional seat suspension device will be explained with reference to FIG. 5. 1 shows the seat suspension device as a whole, 2 is a lower frame fixed to the floor side of the vehicle body, and 3 is an upper frame. A seat cushion body is attached to this upper frame 3 via a seat cushion frame.

The upper frame 3 is connected to the lower frame 2 via a pair of front and rear X-shaped links 5 so as to be swingable in the vertical direction. That is, this X-shaped link 5 is constructed by a pair of links 6 and 7 intersecting in an X shape and pivoted by a pivot 8, with the lower end of one link 6 being pivotally supported by the lower frame 2. The upper end is connected and fixed to a sliding shaft 10 which is disposed on the Atsupa frame 3 so as to be slidable laterally via a roller 10a, and the upper end of the other link 7 is connected and fixed to the Atsupa frame 3. Shaft 1 supported by 3
1, and its lower end is connected and fixed to a sliding shaft 12 disposed on the lower frame 2 so as to be slidable laterally through rollers 12a.

Further, a torsion bar 13 for elastically supporting the upper frame 3 is disposed between the center portions of both X-shaped links 5. That is, the pivots 8 of both X-shaped links 5 are formed in a bush shape. A torsion bar 13 is inserted and supported between both pivots 5, and both ends thereof are bent in opposite directions to form an operating end 13a, and one operating end 13a is connected to an X-shaped link on one side. 5, and the other operating end 13a is fixed to the upper part of the link member 7 of the X-shaped link 5 on the other side.
5, and when the Atsupa frame 3 is lowered and the X-shaped link 5 falls down when seated,
By twisting both operating ends 13a of this torsion bar 13 in opposite directions, elasticity is imparted to the upper frame 3.

[Problem that the invention attempts to solve]

However, in this conventional seat suspension device, the torsion bar is placed between the pivots of both X-shaped links, that is, in the center of the seat. The cushion body of the seat being seated interferes with the torsion bar, making it impossible to lower the hip point of the occupant, making it difficult to use in passenger cars with narrow interior spaces or 2-ton trucks with high floors. It was hot.

The present invention has been made in view of this point, and an object of the present invention is to provide a seat suspension device in which no interfering member is disposed in the center of the seat where the buttocks of the seated person protrudes, and to improve the above-mentioned problems. With the goal.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a pair of link members which are pivotally connected to a lower frame fixed to the floor side by intersecting the upper frame on the seat side in an X-shape. In a seat suspension device configured to be slidably connected in the vertical direction via an X-shaped link mechanism, each link member of the X-shaped link mechanism is formed into a downwardly curved R shape, and the lower frame A torsion bar is supported along one side, the base end of this torsion bar is locked to the lower frame, and the operating end is
By engaging with the upper frame on the outside of the shaped link mechanism, the upper frame is elastically supported with respect to the lower frame.

[Effect]

The measures described above operate as follows. When a person sits on a seat, the Atsupa frame is lowered by lowering each link of the X-shaped link mechanism, and at this time, elasticity is imparted to the Atsupa frame by twisting the torsion bar, and the seated person is given elasticity. is supported. When the Atsupa frame is lowered, the torsion bar is attached along one side of the lower frame, and its operating end is locked to the Atsupa frame side on the outside of both X-shaped link mechanisms. This prevents the protruding part of the seat's buttock from interfering with the torsion bar, and since each link of the X-shaped link mechanism is formed into a downwardly curved R shape, the protruding part of the seat's buttock does not interfere with the link. Therefore, the seated person's hip point is set at a low position.

〔Example〕

Hereinafter, an embodiment of the seat suspension device of the present invention will be described with reference to FIGS. 1 to 4. Parts corresponding to those of the conventional example in FIG. Explanation will be omitted.

In the seat suspension device 1 of this example, the upper frame 3 is slidably connected to the lower frame 2 in the vertical direction via a pair of front and rear X-shaped links 5, similar to the conventional seat suspension device described above. However, the upper frame 3 of this seat suspension device 1 also serves as the cushion frame of the seat in order to make it thinner, that is, the upper frame and the cushion frame are integrated. A cushion body 4 of the seat is directly attached to this upper frame 3.

Moreover, the X-shaped link 5 has both link members 6 and 7.
The X-shaped link 5 is pivoted by a pivot 8 at a position slightly below the center of the link members 6 and 7. 6b and 7b, and the upper part 6 of both link members 6 and 7
a and 7a are formed in an R shape that curves downward, and furthermore, the lower end portions of both link members 6 and 7 are connected and fixed to the lower edges of the shaft 9 and sliding shaft 12 of the lower frame 2. Semi-circular arc-shaped recesses 6a ₁ and 7a ₁ are formed corresponding to the respective regions.

The torsion bar 13 for imparting elasticity to the upper frame 3 supported by the X-shaped link 5 is arranged along one side of the lower frame 2, avoiding the center of the seat suspension device 1. Supported. This torsion bar 13
has one end bent diagonally upward at a substantially right angle to form an operating end 13a, and this operating end 13a
is engaged with the upper frame 3 side via an adjustment mechanism 15, which will be described later, on the outside of both X-shaped links 5, and the other end, that is, the base end 13b of this torsion bar 13 is bent at a substantially right angle in the horizontal direction. It is locked to an extended end 9a of a shaft 9 that is bent and protrudes from the rear side surface of the lower frame 2.

As shown in FIG. 4, the torsion bar 13 is attached to the lower frame 2 by two holding members 16 fixed to one end of the lower frame 2.
A torsion bar 13 is rotatably fitted through a split bush 17. This holding member 16 is
It is formed in a substantially U-shaped cross section, with a mounting hole 16a having an inner diameter approximately equal to the outer diameter of the split bushing 17, and an opening 16b opening outward from the mounting hole 16a. Taking into consideration the component force of the load P applied to the operating end 13a of the torsion bar 13 when seated, the torsion bars 13 are fixed in opposite directions. That is, the holding member 16 on the operating end 13a side of the torsion bar 13 applies a component force to the torsion bar 13 in an outward direction relative to the lower frame 2 due to the seating load P.
Since F ₁ acts, the opening 16b is fixed inward, and the base end 13 of the torsion bar 13 is fixed.
The holding member 16 on the b side has an opening 16b because an inward component force F ₂ acts on the torsion bar 13.
are fixed facing outward, and both holding members 1
The torsion bar 13 is securely attached to the lower frame 2 by fitting the torsion bar 13 with the split bushing 17 fitted into the mounting hole 16a through the opening 16b of No. 6.

Further, the adjustment mechanism 15 of the upper frame 3 to which the operating end 13a of the torsion bar 13 is locked is as follows:
This adjustment mechanism 15 has an adjustment handle 15a and a cam member 15b that is displaced by the rotational operation of the adjustment handle 15a. The operating end 13a of the torsion bar 13 is abutted and engaged with the edge of the cam member 15b, and the adjustment handle 15
The torsion angle of the working end portion 13a of the torsion bar 13 is varied by the displacement of the cam member 15b by the rotation operation a, and the strength of the elasticity imparted to the upper frame 3 is adjusted.

Further, an absorber 18 is connected at an angle between one side of the seat suspension device 1, that is, the outer surface of one side of the lower frame 2 and the lower surface of one side of the upper frame 3. When a large load is suddenly applied to the Atsupah frame 3, the absorber 3 is designed to absorb the impact.

In the seat suspension device 1 of this example configured as described above, when a person sits on the seat, the load causes both link members 6 and 7 of the X-shaped link 5 to fall down, so that the upper frame 3 is lowered. At this time, the torsion bar 13 is twisted to impart elasticity to the upper frame 3, and the seated person is elastically supported.

In this lowered state of the upper frame 3, the cushion body 4 of the seat, which is projected downward by the load of the seated person's buttocks a, does not interfere with any member.

That is, in the seat suspension device 1 of this example, the torsion bar 13 is attached along one side of the lower frame 2, and the operating end 13a
is engaged with the upper frame 3 side on the outside of both X-shaped links 5, and the absorber 18 is also arranged on the outside of the lower frame 2 and upper frame 3, so that the cushion body 4 of the seat is There is no risk of hitting these torsion bars 13 and absorbers 18.

Furthermore, the X-shaped link 5 has upper parts 6a and 7a of both link members 6 and 7 that are longer than lower parts 6b and 7b, and are formed into an R shape that curves downward. 4
will not interfere. That is, when the upper parts 6a and 7a of both link members 6 and 7 of the X-shaped link 5 are formed in a straight line as in the conventional example shown in FIG. Seat cushion body 4 protruding below the perframe 3
will interfere with the X-shaped link 5, but in this example, the X-shaped link 5 is shaped to escape from the cushion body 4, so the cushion body 4
There is no possibility that the X-shaped link 5 will be hit.

In this way, the seat suspension device 1 of this example
In this case, since the cushion body 4 of the seat is not interfered with by any member when sitting, the hip point of the seated person can be set at a low position in combination with the fact that the upper frame 3 is integrated with the cushion frame. Therefore, it can be easily installed in a passenger car with a narrow interior space or a 2-ton truck with a high floor. Also, X-shaped link 5
Since the upper portions of both the link members 6 and 7 are formed into an R shape that curves downward, a larger space can be taken for the arrangement of the cushion body 4 compared to a straight link structure as in the conventional example. It is also possible to insert a part of the cushion body 4 inside the Atsupah frame 3, and in this case, the space can be used effectively and the thickness of the entire seat suspension device including the seat can be made thinner. .

Furthermore, in this seat suspension device 1, the torsion bar 13 can be attached by simply fitting it into the two holding members 16 fixed to the lower frame 2 in opposite directions, which makes it easier to install the torsion bar 13 than in the past. This also has the effect of significantly improving the workability of attaching the torsion bar 13.

Furthermore, this torsion bar 13 is attached to the lower frame 2, and its operating end 13a is directly engaged with the Atsupa frame 3 side without using the X-shaped link 5, so that the load of the seated person is transferred to the Atsupa frame 3. The X-shaped link 5 is received by the lower frame 2 side almost without going through the X-shaped link 5. Therefore, the durability of the X-shaped link 5 is improved, and uneven wear of the pivot shaft 8 can be particularly prevented, and the seat suspension Device 1
It has various practical effects, such as increasing the lifespan of the machine.

In this embodiment, the torsion bar 13 is attached to the lower frame 2 side, and the operating end 13
Although the configuration in which a is engaged with the Atsupa frame 3 side is shown, this can be changed to the opposite arrangement relationship, that is, the Atsupa frame 3 side.
The torsion bar 13 may be attached to the side, and the operating end 13a thereof may be configured to engage with the lower frame 2 side. Further, in this embodiment, the upper portions 6a and 7a of both link members 6 and 7 of the X-shaped link 5 are partially curved downward, but the link members 6 and 7 are curved downward as a whole. It may also have a curved shape.

Furthermore, it goes without saying that the present embodiment does not specify the present invention and that various changes and modifications can be made in other configurations without departing from the gist of the present invention.

[Effect of idea]

As described above, in the seat suspension device of the present invention, each link member of the X-shaped link mechanism is formed into a downwardly curved R shape, and the torsion bar is attached to one of the lower frame and the upper frame. By attaching it along the side and having its operating end engage the other frame on the outside of both X-shaped link mechanisms, the protruding part of the seat's buttock interferes with the torsion bar and the X-shaped link mechanism when seated. Since the hip point of the seated person can be set low, and the internal space can be used effectively, the thickness of the entire seat suspension system including the seat can be made thinner, which reduces the space inside the vehicle. It can be easily installed in narrow passenger cars and trucks with high floors.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the seat suspension device of the present invention seen from the rear, Fig. 2A is a front view of the seat suspension device, Fig. FIG. 4 is an explanatory diagram of the attachment relationship between the torsion bar and the holding member, and FIG. 5 is a perspective view of a conventional seat suspension device. In the figure, 2 is the lower frame, 3 is the upper frame, 5 is the X-shaped link, 13 is the torsion bar, 1
3a is its working end.

Claims (1)

[Claims for Utility Model Registration] A pair of X-shaped links in which the Atsupah frame on the seat side is pivotally connected to the lower frame fixed to the floor side by making a pair of link members intersect in an X-shape. In the seat suspension device configured to be slidably connected in the vertical direction via a mechanism, each link member of the X-shaped link mechanism is formed into a downwardly curved R shape, and the lower frame and the hot A torsion bar is supported along the side of one of the frames, and the proximal end of the torsion bar is locked to the one frame, and the operating end is attached to the outside of both the X-shaped link mechanisms. A seat suspension device characterized in that it engages with a frame side and elastically supports the above-mentioned Atsupah frame.