JPH0434107Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a seat for an industrial vehicle such as a forklift, and more particularly to a seat having a suspension mechanism that can follow the movements of an operator's back.

(Prior Art) Considering the working style of a forklift, the forklift frequently travels forward and backward at approximately the same rate.

Normally, when driving backwards, one may turn one's body straight forward and use a rearward confirmation device such as a parking mirror to drive backwards, but in many cases, to ensure safety, one must turn one's body forward and drive backwards. do. At this time, the operator twists his body and drives with his back arched slightly backwards.

For this reason, forklift seats are required to have a function that accommodates not only the forward-facing position when moving forward, but also the backward-facing position.

Therefore, in some conventional vehicle seats, as shown in FIG. 4, the backrest part a of the seat can be rotated (c is the center of rotation) so that it can follow the movement of the back. Although this vehicle has excellent backward operation, the seating portion b is an ordinary seat containing so-called cushioning material, and has little effect on absorbing vibrations and shocks to the operator caused by driving on rough roads, etc.

Therefore, recently, as shown in Figures 5 and 6,
Suspension type sheets, which have a large absorption effect, are often used.

(Problems to be solved by the invention) The one shown in Fig. 5 is disclosed in Utility Model Publication No. 17530/1983, but the seat part b and the back rest part a are integrated, and the seat part b is A link mechanism c is provided below,
The backrest part a is provided with a guide body d that can rotate and a shaft e that slides up and down to form a vehicle seat, and because it cannot rotate, the problem of not being able to follow the movement of the back when driving backwards still remains. Not resolved.

Next, even if the lower part of the seat and the backrest have link mechanisms, as in Utility Model No. 56-4356,
Similar to the one shown in FIG. 5, the seat portion and the backrest portion are integrated, so there is a similar problem.

In addition, the one in Figure 6 is from Japanese Patent Publication No. 11130/1983, and in this case the seat and backrest are not integrated, but rather a seat that can be reclined, and the angle of the backrest can be adjusted according to the operator's preference. Although this is superior to the conventional example in terms of performance, there remains a problem in the ability to drive backwards.

(Means and effects for solving the problem) This invention was made in view of the above points, and has a substantially L-shaped structure that supports a seat cushion and a back cushion having a backrest plate at the rear. Attach the first support frame to the second support frame via a link, fix the third support frame to the second support frame, and install the guide of the first support frame in the vertical direction in the center of the third support frame. A shaft that is slidable and also has the function of adjusting the operator's weight is inserted vertically so that the shaft can be rotated within the hole of the third support frame, a knob is provided at the upper end of the shaft, and the lower end protrudes from the support frame. At the same time, the first plate is fixed to the first support frame so as to sandwich the guide located in the middle of the shaft with a certain gap when the operator is seated. A second plate fixed to the plate is sandwiched from both outsides of the first plate, a bolt is inserted through a nut fixed to the second plate to support the guide from both ends, and each plate is rotated around the bolt. In addition to making it possible to move
Two springs are stretched between near both ends of the spring hanging plate whose center part is screwed to the screw and the cross beam of the second support frame, and the cross beams of the first support frame and the cross beam of the second support frame are connected to each other. A shock absorber is provided between the operator and the operator. By configuring the first plate and the second plate to be able to rotate freely, the suspension device stops when the operator's back moves, and the suspension device is configured to be able to rotate freely. This makes it possible to absorb and attenuate vibrations and shocks transmitted to the seat.

(Example) Next, an example of this invention will be described based on the drawings.

Referring to FIGS. 1 and 2, 1 is a seat cushion, 2 is a back cushion having a backrest plate ₂₁ at the rear, 3 is a substantially L-shaped first support frame; It supports the cushion 1 and the back cushion 2.

The first support frame 3 is connected to the second support frame 4 via the link 7.
A third support frame 5 is fixed to the second support frame 4, and a guide 18 of the first support frame 3 is slid vertically in the center of the third support frame 5, and a guide 18 of the first support frame 3 is attached to the center of the third support frame 5 to adjust the operator's weight. Holes 8, 8 through which the shaft 6, which also serves as a shaft, can be inserted vertically and rotated.
are provided at the top and bottom.

As shown in FIG. 2, a threaded portion 11 is provided at the lower end of the slide and weight adjustment shaft 6 by protruding the third support frame 5, and retaining pins 12 and 13 are provided above and below the threaded portion 11. .

The upper end of the shaft 6 is also made to protrude from the support frame 5, and a knob 9 is provided at the upper end.

The center part of the spring hanging plate 10 is screwed into the screw 11, and the spring hanging plate 10 is inserted between the ends of the hanging plate 10 and the cross beam 27 of the second support frame 4, as shown in FIG.
A shock absorber 25 was provided between the cross beam 26 of the first support frame 3 and the cross beam 27 of the second support frame 4.

Therefore, by turning the knob 9 left and right, the spring hanging plate 10 moves up and down, and the tension of the spring 15 changes.

On the other hand, 18 is a guide, which is located approximately in the middle of the shaft 6 when the operator is seated. 16 is a first plate fixed to the first support frame 3 and a guide 18
It is designed to be sandwiched with a certain gap,
A hole 19 is provided in the center of the guide 18, and the guide 18 slides up and down with respect to the shaft 6.

Reference numeral 17 denotes a second plate fixed to the backing plate ₂₁ , which is connected to the first plate 16 from both outsides of the first plate 16.
The guide 18 is inserted into the nut 22 fixed to the second plate 17 from both sides as shown in FIG.
It is supported from both sides by the second plate 17.

And these plates 16, 17 and guide 1
8 is in a state of balance by being in contact with the upper part of the third support frame 5 when the operator is not on it, that is, in a so-called free state.

Next, the operation will be explained. When the operator sits down, the link 7 rotates via the seat section 1 and the first support frame 3, and the guide 18 of the first support frame 3 slides vertically along the shaft 6. It then stops when the operator's weight and the tension of the spring 15 are balanced.

At this time, the link 7 basically performs a circular motion, whereas the guide 18 performs a linear motion along the shaft 6. Therefore, since the plate 16 fixed to the first support frame 3 can rotate around the bolt 23, no strain is applied to the shaft 6 or the second support frame 4.

Particularly when driving backwards, the plate 17 fixed to the back plate ₂₁ can also rotate around the bolt 23 to accommodate changes in the operator's back or posture when driving while looking backwards. Therefore, the suspension device follows the movement of the operator's back, and the shock absorber 25 has the role of absorbing and damping vibrations and shocks transmitted to the seat.

Note that the weight can be adjusted by turning the knob 9 as described above to change the initial tension of the spring 15 to match the weight of the operator.

As described above, the embodiment of this invention has a suspension mechanism and also allows the backrest to rotate, so it is particularly suitable for driving a forklift or the like which often travels backwards.

Furthermore, since the slide shaft is also used as a weight adjustment shaft, the mechanism behind the back cushion can be made thin and compact, which is extremely advantageous in terms of space.

FIG. 3 shows another embodiment, in which the center of rotation of the back cushion is set at the bolt 23 in FIG. , and detailed explanation will be omitted.

In this case, the distance l from the backrest plate to the center of rotation can be reduced, so the amount of movement of the backrest plate can be reduced to obtain the required rotational angle, and the ability to follow the movement of the back can be further improved. get well.

(Effects of the invention) This invention is made as detailed above, and the seat has a suspension mechanism that allows the backrest to rotate, that is, to follow the movements of the back. Therefore, it is extremely suitable for driving a forklift, etc., which often travels in reverse, and has a great effect of absorbing vibrations and shocks to the operator when driving on rough roads.

In this way, according to this invention, the shaft and
In addition to eliminating strain on the support frame,
It can attenuate and absorb vibrations and shocks transmitted to the operator.

Furthermore, since the same shaft is used for both sliding and weight adjustment, the mechanism behind the back cushion becomes compact, which is extremely advantageous in terms of space.

[Brief explanation of the drawing]

Fig. 1a is a side view of the main part of an embodiment of this invention, Fig. 1b is an explanatory diagram showing the details around the guide enlarged, as seen from the Y direction of Fig. 1a, and Fig. 2 1A shows a portion of the suspension mechanism in the X direction of FIG. 1a, and FIG. 3 shows another embodiment. FIGS. 4, 5, and 6 each show three conventional devices. DESCRIPTION OF SYMBOLS 1... Seat cushion, 2... Back cushion, 2 ₁ ... Back support plate, 3... First support frame,
4... Second support frame, 5... Third support frame, 6... Shaft, 8... Hole, 9... Knob, 10... Spring hanging plate, 11... Screw, 12... Retaining pin, 13... Retaining pin, 15... Spring, 16... First plate, 17... Second plate, 18... Guide, 22... Nut, 23...
Bolt, 24...cross beam, 25...shock absorber, 27...cross beam.

Claims (1)

[Scope of utility model registration request] A substantially L-shaped first support frame 3 supporting the seat cushion 1 and the back cushion ₂ having a back plate 21 at the rear is attached to the second support frame 4 via a link 7, and A third support frame 5 is fixed to the second support frame 4, and in the center of the third support frame 5 there is a shaft 6 that slides the guide 18 of the first support frame 3 in the vertical direction and also has the function of adjusting the operator's weight. is inserted in the vertical direction to enable the shaft 6 to rotate within the holes 8, 8 of the third support frame 5, a knob 9 is provided at the upper end of the shaft 6, and the lower end protrudes from the support frame 5 to prevent it from falling out vertically. A guide 1 is provided with a screw 11 having pins 12 and 13, and is located approximately in the middle of the shaft 6 when the operator is seated.
The first plates 16, 16 are fixed to the first support frame 3 so as to sandwich the plates 8 at a certain interval, and
Second plate 17, 1 fixed to back plate 2 ₁
7 from both outsides of the first plates 16, 16, and bolts 23, 23 are inserted into nuts 22, 22 fixed to the second plates 17, 17 to support the guide 18 from both ends.
6 and 17 are rotatable around the bolts 23, respectively, and near both ends of the spring hanging plate 10 whose center portion is screwed into the screw 11 and the second support frame 4.
Two springs 15, 15 are placed between the crossbeam 27 of
A rotating vehicle seat with a backrest, characterized in that a shock absorber 25 is provided between a crossbeam 26 of a first support frame 3 and a crossbeam 27 of a second support frame 4.