JPH0218744Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a seat support structure for a forward-reverse tractor.

<Prior Art> There is a forward-reverse type tractor that enables forward and backward driving by changing the mounting positions of the handle and seat. In this type of tractor, a step sheet is installed between the left and right rear wheel fenders to cover the tractor body, and the seat is attached to the step sheet when driving forward, and the step sheet is used as a step when driving backward. I have to.

However, since the rear of the tractor body is equipped with a hydraulic system for raising and lowering the work equipment, it is necessary to avoid interference with this system, so it is not possible to install a seat close to the step seat, and it is not possible to install a seat close to the step seat. It is normal that they are installed at a certain distance above. Therefore, conventionally, an integrated trapezoidal support part is provided in the hydraulic device corresponding part on the step seat, and the seat is detachably attached to this support part.

<Problems to be solved by the invention> However, in the past, as mentioned above, the support part was integrated with the step seat, so when driving backwards, the part that became the step was separated to the left and right by the support part. However, there was a drawback that the step surface was limited in terms of area. Furthermore, a cushion sheet was laid on top of the step sheet, but it also had to be divided into left and right sections. Moreover, although the step seat is normally attached to the tractor vehicle body via a vibration-isolating structure, since the seat is attached to a supporting portion that is integrated with the step seat, a sufficient vibration-isolating effect cannot be expected.

<Means for solving the problem> In view of these conventional problems, the present invention makes it possible to widely use the top of the step seat as a step, and also improves the anti-vibration effect of the seat by using a cushion sheet. It was provided for the purpose of improving the condition of the tractor, and its characteristics are that a step sheet is provided between the left and right rear wheel fenders so as to cover the tractor body; In a forward/reverse type tractor in which a seat for forward driving is detachably attached and the step sheet is used as a step for backward driving, a cushion sheet is laid on the top of the step seat to support the seat. The support bracket is removably attached to the step seat via the cushion seat.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIGS. 5 and 6, reference numeral 1 denotes a tractor body consisting of a transmission case, etc., with rear wheels 2 on the left and right.
has. 3 is the bonnet that covers the engine etc.
Reference numeral 4 denotes steps attached to both sides of the tractor body 1. Reference numeral 5 denotes a hydraulic system for lifting and lowering the working machine, which is mounted on the rear of the tractor body 1. Rear wheel fenders 6 are arranged inside the left and right rear wheels 2 and attached to the tractor body 1 side. Reference numeral 7 denotes a step sheet, which is provided between the left and right rear wheel fenders 6 so as to cover the tractor body 1. Anti-vibration structure (not shown)
It is installed through. An opening 8 is formed in the step sheet 7 at a portion corresponding to the hydraulic system 5, and elongated holes 9 are formed so that a clutch pedal, a brake pedal, etc. for rearward driving protrude upward.
10 is formed, and an upright portion 11 is provided that stands up upward from the rear end. 12 is a gear shift guide plate;
13 is a guide plate for the hydraulic control lever. Reference numeral 14 denotes a cushion sheet made of rubber or the like, which is laid on the step sheet 7 and attached with hooks or the like. The cushion seat 14 has a length extending substantially over the entire width between the left and right guide plates 12 and 13, and has a cover portion 15 formed in a convex shape in plan view to cover the head portion side of the hydraulic device 5. are provided with appropriate anti-slip protection. A handle 16 is provided at the upper end of the handle post 17. The handle post 17 is removably attached to a mounting device 18 at the lower rear of the bonnet 3 during forward driving, and to a mounting device 19 on one side of the hydraulic device 5 during backward driving. 2
Reference numeral 0 designates a driver's seat, which is detachably attached to a support bracket 21 on the step seat 7 when driving forward, and onto a panel 22 at the rear of the bonnet 3 when driving backward.

The support bracket 21 includes a pair of left and right side plates 23 and a seat receiving plate 24, as shown in FIGS. 1 to 3. The side plate 23 integrally has an inwardly bent portion 25 on the upper end side and an outwardly bent portion 26 on the lower end side, and the seat receiving plate 24 is connected to the bent portion 25 by spot welding or the like. has been done. A mounting plate 27 that supports the seat 20 from below is inserted and attached to the seat support plate 24 so as to be adjustable in its longitudinal position. Side plate 2
A pair of front and rear pressing members 28 and a ring-shaped spacer 29 are attached to the lower surface of the bent portion 26 of No. 3 by welding so as to connect the left and right sides. Then, this support bracket 21 is attached to the butterfly bolt 3 while pressing the cushion seat 14 with the presser member 28.
0 and a nut 31, it is detachably attached to the step sheet 7. The spacer 29 is for regulating the amount of pressure the cushion sheet 14 is held by the presser member 28, and is made to protrude slightly downward from the lower surface of the presser member 28. As shown in FIG. 4, the butterfly bolt 30 is inserted into a hole 32 formed in the bent portion 26 approximately at the center of the spacer 29, and is prevented from coming off by a retaining ring 33. The retaining ring 33 is provided at such a position that it does not come into contact with the step sheet 7 even when the butterfly bolt 30 is tightened to the nut 31. The nut 31 is welded to the frame 34 of the step seat 7. In addition,
As the retaining ring 33, a retaining ring as shown in FIG. 7 may be used, or a push nut 36 having a pawl 35 on the inner periphery as shown in FIG. 8 may be used. Of the pair of front and rear press members 28, the front press member 28 covers the front edge of the cushion sheet 14 to prevent it from turning over, and the rear press member 28 covers the cover portion 15 that protrudes to cover the head portion of the hydraulic device 5. It is designed to hold down the base of each. Note that a notch 36 is formed in the cushion sheet 14 at a portion corresponding to the spacer 29.

In the above configuration, when driving forward, the handle 1
6 and the seat 20 are installed in the solid line state shown in FIG. 5, and when driving in reverse, they are installed in the imaginary line state.

When driving forward, a support bracket 21 is used and the seat 20 is attached to it. In this case, since the holding member 28 attaches the support bracket 21 to the step seat 7 using the cushion sheet 30, the cushion sheet 14 acts as a vibration isolator for the seat 20 and absorbs minute vibrations from the tractor body 1 side. do. Therefore, the vibration isolation effect of the seat 20 is significantly improved. Furthermore, when attaching the support bracket 21 by tightening the butterfly bolt 30, since the spacer 29 is provided protruding from the presser member 28, it is possible to control the presser width of the cushion sheet 14 and prevent problems such as over-tightening. It is possible to prevent the deterioration of the vibration effect. Note that it is preferable to leave a slight gap between the spacer 29 and the step sheet 7 from the viewpoint of vibration isolation.

When driving backwards, remove the mounting plate 27 of the seat 20 from the seat receiving plate 24 of the support bracket 21 and attach it to the rear panel section 22 of the bonnet 3, loosen the butterfly bolts 30, and move the support bracket 21 onto the step seat 7. Remove from. When this support bracket 21 is removed, the top surface of the step sheet 7 becomes flat with a slight inclination, and since the cushion sheet 14 is laid on top of it, the step surface becomes very wide during backward operation. Improves the operability of pedals. Also, one cushion sheet 14
Since it can be used, its installation is easier than in the conventional case where it is divided into two parts. Although the support bracket 21 is removed and stored, the wing bolt 30 is prevented from being lost because the retaining ring 33 prevents the wing bolt 30 from being removed.

The support bracket 21 only needs to be attached to the step sheet 7 via the cushion sheet 14. Therefore, it is possible to omit the spacer 29 or both the spacer 29 and the presser member 28. It can provide a certain degree of vibration damping effect.

<Effects of the invention> According to the invention, the support bracket that supports the seat is detachably provided on the step seat, so when driving backwards, the support bracket can be removed, and a wide step surface on the step seat can be secured. can. Also, since there are no protruding parts, the operability of pedals is improved. Moreover, since the support bracket is attached to the step seat via the cushion sheet, the cushion sheet also functions as a vibration damper for the seat, and the vibration damping effect is significantly improved.

[Brief explanation of the drawing]

The drawings illustrate one embodiment of the present invention, in which Fig. 1 is a cross-sectional side view of the main part, Fig. 2 is a front view thereof, Fig. 3 is a plan view of the support bracket, and Fig. 4 is a cross-sectional side view of the main part. 1 is an enlarged sectional view, FIG. 5 is a sectional side view of the rear part of the tractor, FIG. 6 is a plan view thereof, FIG. 7 is a plan view of the push nut, and FIG. 8 is a sectional view thereof. 1...Tractor body, 6...Rear wheel fender, 7...
Step sheet, 14... Cushion sheet, 20
... Seat, 21... Support bracket, 28... Pressing member, 29... Spacer, 30... Butterfly bolt.

Claims (1)

[Scope of utility model registration request] A step sheet is provided between the left and right rear wheel fenders to cover the tractor body, and a seat for forward-facing driving is removably attached above this step sheet, and this step sheet is also used as a step for driving backwards. A forward-reverse drive tractor characterized in that a cushion sheet is laid on the top surface of the step seat, and a support bracket for supporting the seat is removably attached to the step seat via the cushion sheet. type tractor seat support structure.