JPS63499Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention is an invention related to a seat device for an agricultural tractor.

(B) Prior Art Conventionally, there is a known technology in which a seat in a moving vehicle is slid back and forth on an inclined surface, and the position of the seat is adjusted up and down along with the back and forth slide.

For example, as in Japanese Utility Model Application Publication No. 48-98410.

(c) Problems to be solved by the invention The invention solves the problem of installing a tractor seat by installing a seat fixing bracket on the rear axle case or hydraulic case, and attaching a seat base or slider to the seat as in the conventional method. Instead of arranging a dynamic base to support the seat, the seat base is directly fixed to the inclined surface of the upper surface of the hydraulic case.

If the seat base is fixed directly to the upper surface of the hydraulic case in this way, it is no longer possible to support the seat base using an elastic body or a cushion device on the hydraulic case. The cushioning mechanism of the seat deteriorates.

The present invention replaces the cushion device that cannot be constructed between the seat base and the hydraulic case by interposing a spring between the outer case protruding above the sliding base and the inner case protruding from the seat. It is.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

A seat base 11 is fixed on the upper surface of the hydraulic case 8 placed on the upper surface of the rear axle case 7, and a sliding base 12 is fitted into the seat base 11 so as to be slidable back and forth. An outer case 14 is installed upright at the rear upper part of the outer case 14, and the inner case 1 is vertically slidable inside the outer case 14.
A spring 22 is interposed between the outer case 14 and the inner case 17, and the inner case 17 and the seat 10 are fixed.

(E) Embodiment The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is an overall side view of the agricultural tractor.

An engine 2 is placed inside a bonnet 1, and a clutch housing 5 is fixed to the rear surface of the engine 2.
A transmission case 6 is fixed to the rear surface of the clutch housing 5, and a rear axle case 7 is further fixed to the rear surface of the transmission case 6.

A basic framework consisting of an engine 2, clutch housing 5, transmission case 6, and rear axle case 7 is supported by front wheels 3.3 and rear wheels 4.4.

A hydraulic case 8 of a hydraulic system for lifting and lowering a working machine is mounted and fixed on the upper surface of the rear end of the rear axle case 7.

The present invention relates to the hydraulic case 8 and the seat 10. 9 is a hydraulic lift arm.

FIG. 2 is a side view of the hydraulic system and the seat, and FIG. 3 is a side view showing the configuration of the seat moving device.

The upper surface 8a of the hydraulic case 8 is configured as an inclined surface with a lower front and rear height, and a seat base 11 is fixed to the inclined surface 8a with bolts. A sliding base 12 is fitted into the sliding rail portion of the seat base 11 so as to be slidable back and forth. A base bracket 13 is erected on the sliding base 12, and an outer case 14 is further erected on the base bracket 13.

Further, a swing arm shaft 15b is pivotally supported on the base bracket 13, and the swing arm 15 is provided to protrude forward from the swing arm shaft 15b. The swing arm is fixed to the seat 10 by a mounting body 15a at the front end thereof.

In FIG. 3, an elastic body 18 may be provided protrudingly in the middle of the swing arm 15 to serve as a damper.

The seat 10 is provided with an adjustable cushion device to improve seating comfort for the driver. An inner case 17 is supported within the outer case 14 so as to be vertically slidable, and is suspended from a spring latch 21 via a spring 22. A seat 10 is fixed to the inner case 17, and the seat 10 is suspended by a spring 22.

The spring latch 21 is moved up and down within the outer case 14 by the rotation of the screw rod 20 to adjust the length of action of the spring. 16 is an adjustment handle for rotating the screw rod. Furthermore, a damper 23 is installed inside the vehicle to absorb the shock when the driver lowers his/her back into the seat. 24 is a bracket to which a license plate, various display boards, etc. are attached.

6 is a plan view of the swing arm, FIG. 7 is a rear view of the outer case, FIG. 8 is an enlarged view of the upper end of the seat, and FIG. 9 is a sectional view of the seat.

In FIG. 6, a sliding base 12 is slidably inserted into the seat base 11 so as to be slidable back and forth. A plurality of fixing recesses 11a are provided in the seat base 11, and fixing levers 19, 19 are provided in the fixing recesses 11a.
The structure is such that the claws a engage to fix the position. 19b is a connecting rod for the left and right fixed levers.

In FIG. 7, 25 is a display window for displaying the amount of adjustment by the adjustment handle 16.

8 and 9, the seat 10 has a structure in which an elastic material is wrapped inside by cushion leather 27 and back cushion 10g. 10d is a cushion part, 10e is a back cushion, 10
f is a back insert. The cushion leather 27 and the back cushion 10g are connected at the periphery of the seat 10 by an inner grip 10c, a profile 10b, and an outer grip 10a as shown in FIG. 8, and are connected by an air vent 26 at the deepest position of the waist.

FIG. 4 is a sectional view of the hydraulic case 8, and FIG. 5 is a side view of the right side of the hydraulic case 8 in the direction of movement.

In FIG. 4, a cylinder 28 is loosely installed within the hydraulic case 8, and a piston 30 is fitted and slid into the cylinder 28. piston 30
The rod 29 protrudes further and engages with a lift crank 31 fixed to a lifting shaft 32.

The lift crank 31 is provided on the inner surface of the rear high part of the hydraulic case, and is configured to make the length of the lift crank 31 as long as possible.

A top ring bracket 33 is provided on the outside of the rear end of the hydraulic case and is pivotally supported by a pivot pin 33a, and a draft control spring 34 is connected to another pivot pin 33b of the top link bracket via a spring shaft 35. I am intervening.
33c is the pivot hole of Toppurin.

In FIG. 5, a draft control arm 38 extends from the top link bracket 33 to the feedback link 39, and a position control arm 37 extends from the base of the lift arm 9 to the feedback link 39. Feedback link 39 operates hydraulic directional control valve 36.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, since the seat fixing bracket is not interposed between the hydraulic case 8 and the seat base 11 as in the past, it is directly fixed to the upper surface of the hydraulic case 8.
The seat 10 can be placed as low as the conventional seat fixing bracket, which is effective when it is desired to place the seat 10 as low as possible in a large tractor.

Second, by directly fixing the seat base 11 to the hydraulic case 8, there is no longer a part for installing a cushion device, which was conventionally installed in the seat fixing bracket. By arranging the cushion device inside the outer case 14 erected on the seat base 11, the seat device can be expected to have the same cushioning effect as the conventional seat device.

Thirdly, an inner case 17 that is vertically slidable is disposed inside the outer case 14, and the backrest portion of the seat 10 is fixed to the inner case 17, and the outer case 17 is
By suspending the inner case 17 from the seat, the vertical range of the seat 10 can be increased, and the spring 22 can be configured as a soft spring, improving elasticity.

This improved elasticity also makes it possible to alleviate large-amplitude shocks that occur when the tractor runs over uneven terrain.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the agricultural tractor, Fig. 2 is a side view of the hydraulic system and seat section, Fig. 3 is a side view showing the configuration of the seat moving device, Fig. 4 is a sectional view of the hydraulic case, Fig. 5 is a side view of the right side of the hydraulic case 8 in the direction of movement, Fig. 6 is a plan view of the swing arm section, Fig. 7 is a rear view of the outer case, Fig. 8 is an enlarged view of the upper end of the seat, and Fig. 9 is a plan view of the swing arm section. It is a sectional view of a seat. 8... Hydraulic case, 10... Seat, 11... Seat base, 12... Sliding base, 14... Outer case, 17... Inner case, 22...
spring.

Claims (1)

[Scope of utility model registration request] A seat base 11 is fixed on the upper surface of the hydraulic case 8 placed on the upper surface of the rear axle case 7, and a sliding base 12 is fitted into the seat base 11 so as to be slidable back and forth. An outer case 14 is installed upright at the rear upper part of the outer case 14, and the inner case 1 is vertically slidable inside the outer case 14.
7, a spring 22 is interposed between the outer case 14 and the inner case 17, and the inner case 17 and the seat 10 are fixed to each other.