JP2594830Y2 - Suspension seat adjustment device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension seat adjusting mechanism, and more particularly to an improvement of a mechanism for adjusting a height of a seat portion or a corresponding load.

[0002]

2. Description of the Related Art A suspension seat as shown in FIG. 3 is known as a suspension seat used for a large vehicle or the like.
In the figure, reference numeral 1 denotes a seat, and 2 denotes a suspension mechanism which supports the seat so as to be vertically movable.

The suspension mechanism 2 connects a base frame section 3 fixed on the floor and a seat frame section 4 fixed on the bottom surface of the seat 1 via a pair of link mechanisms 5 located on left and right side surfaces. It is configured.

As shown, the link mechanism 5 is connected to two links 6 and 7 so as to be rotatable about a center pin 8. The links 6 and 7 are swingably connected to the vicinity of the rear portions of the seat frame portion 4 and the base frame portion 3 via rear end pins 6R and 7R, respectively, and the front end pins 6F and 7F (guides). The pins are slidably fitted into long holes 3A and 4A formed in the front side surfaces of the base frame portion 3 and the seat frame portion 4, respectively. With such a configuration, the suspension device 2 includes the elongated holes 3A and 4A.
The links 6 and 7 rotate about the pin 8 by an allowable angle in accordance with the sliding of the pins 6F and 7F in the inside, so that the height of the seat frame 4 with respect to the base frame 3 can be adjusted. And

On the other hand, the front end of the link 7 (pin 7F)
) And the front end of the seat frame portion 4, a coil spring 9 is interposed. The tension of the coil spring 9 urges the suspension mechanism 2 in the direction in which the seat frame portion 4 rises, and Has a cushioning effect.

The front end of the coil spring 9 is configured so that its compression load can be adjusted via a screw feed type adjusting mechanism 10 provided at the front end of the seat frame 4. That is, as shown in FIG. 4, the adjusting mechanism 10 moves the spring seat 12 attached to the front end of the coil spring 9 based on the operation of the dial 11 provided at the front end to reduce the compression load of the coil spring 9. It can be adjusted.

[0007]

By the way, the coil spring 9 for adjusting the load is mounted on the surrounding seat frame 4.
If it hits such a part, operability and spring life may be impaired.

As a countermeasure, it is conceivable to secure a large space around the coil spring 9 to avoid interference with surrounding components. However, if such a design is difficult due to dimensional restrictions, As shown in FIG. 4, a protective tube 13 made of a soft resin material such as vinyl chloride is placed around the coil spring 9.

However, since the protective tube 13 made of such a soft material deforms itself and resists the operation of the coil spring 9, the smooth expansion and contraction operation of the coil spring 9 is hindered, or There has been a problem that the tube 13 shifts due to expansion and contraction, and the original protection function cannot be obtained.

The present invention has been made in view of such a problem, and has as its object to reliably protect the coil spring supporting the suspension seat while maintaining good operability.

[0011]

In order to achieve the above object, according to the present invention, a guide pin is provided as a suspension for a seat.
Seat can be moved up and down according to movement along the hole
While providing a supporting link mechanism , the link mechanism guide
A coil spring that urges the seat in the upward direction via the pin, and the compression load of this coil spring is used as a guide pin.
And an adjusting mechanism for adjusting the distance between the coil mechanism and a cylindrical protective tube made of a hard material on the outer periphery of the coil spring .
A guide pin is used to prevent the protection tube from coming off, and the protection tube is provided with a claw for locking one end of the protection tube to the rear end of the coil spring.

[0012]

[Function] The cylindrical protection tube is
Coil spring interferes with surrounding parts
To prevent In this case, the protection tube moves in the fitting direction with respect to the coil spring via the claw at one end thereof.
Is regulated, and the coil spring is
The movement to the side opposite to the fitting direction with respect to the bracket is also restricted. So
Because of the protection tube with the expansion and contraction of the coil spring
Never but as to move back and forth in the fitted direction, protection Ji
As for the rotation of the tube, the claw is attached to the guide pin of the link mechanism.
It is regulated when locked . Also, because it is made of hard material ,
It protective tube such as to inhibit deformation and expansion and contraction operation of the coil spring in such a conventional yet greens. As a result,
Yl spring is well protected, can ensure smooth operation of the coil springs and suspension seat. Also, the claw is provided only at one end of the protection tube
So that it may interfere with the fitting to the coil spring
Also, the assembling property of the protective tube can be favorably obtained.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in FIG. 4 are denoted by the same reference numerals.

In FIG. 1, reference numeral 4 denotes a seat frame constituting a suspension mechanism of a suspension seat, 9 denotes a coil spring for adjusting the load on the suspension seat, 10 denotes an adjustment mechanism provided at a front end thereof, and 11 denotes an adjustment mechanism. Is a spring seat interposed between the coil spring 9 and the adjusting mechanism 10, and their configuration is the same as that of FIG.

In the present invention, a protective tube 14 made of a hard material such as a metal, reinforced plastic, or fluororesin is fitted in the coil spring 9. Protection tube 14
The inner diameter of the coil spring 9 is set to have a certain margin so that the coil spring 9 can smoothly expand and contract, and the length is set to an extent corresponding to the maximum compression length in use of the coil spring 9.

One end of the protective tube 14, in this case a coil
At the rear end of the spring 9 in the fitting direction , two claws 14 are opposed to each other so as to protrude toward the inner diameter side as shown in FIG.
A is formed, and this claw 14A is locked to the rear end of the coil spring so that the protection tube 14 does not move forward with the expansion and contraction of the coil spring 9. In addition,
The pin 7F (guide pin) of the link mechanism for locking the rear end of the coil spring 9 is connected to one end (rear end) of the protection tube 14.
Because even in contact with the protective tube 14 nor that would move backward.

Based on the above configuration, the protection tube 14 is always held at a fixed position against the expansion and contraction of the coil spring 9 when the adjusting mechanism 10 is operated or a load is applied to the seat, and the outer peripheral portion of the coil spring 9 is Siege. Therefore, the coil spring 9 operates to expand and contract inside the protective tube 14, and operates smoothly without being caught or in contact with a part of the surrounding seat frame 4 or the like.

Further, since the positional relationship between the protection tube 14 and the coil spring 9 is maintained by the claw 14A, the protection function is not impaired by the movement or falling off.

[0019]

[Effects of the Invention] As described above, according to the present invention , the suspension of the seat
Seat according to the movement along the long hole of the guide pin as a suspension device
A link mechanism is provided to support the vertical translation of the
While the seat is raised via the guide pin of the link mechanism.
Coil spring and the coil spring
To adjust the compression load of the bearing between the guide pin
And a mechanism,
Cylindrical protection tube made of hard material
Insert the protection tube with the guide pin of the link mechanism.
While protecting the
Claws are provided at the rear end of the spring to lock
Move the protective tube covering the outer periphery of the
Movement) and coil springs with peripheral parts
Good protection from interference allows the coil spring
And smooth operation of the suspension seat
You. Also, the claw is provided only at one end of the protection tube
So that it may interfere with the fitting to the coil spring
Also, the assembling property of the protective tube can be favorably obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention.

FIG. 2 is an external perspective view of the tube of the embodiment.

FIG. 3 is a schematic configuration diagram of a conventional example of a suspension seat.

FIG. 4 is a detailed sectional view of a portion A in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat 2 Suspension mechanism 9 Coil spring 10 Adjustment mechanism 14 Protective tube 14A Claw

Claims (1)

(57) [Scope of request for utility model registration] 1. A guide pin is used as a suspension for a seat.
The seat can be moved up and down in parallel according to the movement along it
While providing a link mechanism,
A coil spring that urges the seat in the ascending direction through the
And adjusting mechanism for adjusting between, in the suspension sheet comprising, fitted a cylindrical protective tube made of hard material on the outer periphery of the coil spring, gas linkage
An adjustment mechanism for a suspension seat, characterized in that the protection tube is prevented from coming off by an id pin, and a claw for locking one end of the protection tube to a rear end of the coil spring is provided.