JPS632335Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention aims to make the seats of agricultural tractors etc. comfortable to sit on while driving.

(b) Prior Art It is known that the backrest of a seat in an automobile or the like can be freely rotated back and forth.

For example, Publication No. 47-28014 and Special Publication No. 40-
For example, Publication No. 8850.

(c) Problems that the invention aims to solve When traveling for work, the operator turns around many times to monitor the work equipment behind him, forcing him to twist his lower back and neck in his seat, which can lead to lower back pain and neck pain. It was causing pain.

The purpose of this invention is to eliminate such problems, and the seat device can be easily moved forward and backward, horizontally, and backrest by operating a lever on the operation column installed in the seat. and when the operator needs to look back,
The seat can be rotated immediately, so the operator does not have to take an unreasonable position.

Furthermore, if the seat rotates while traveling during work, the positional relationship between the hydraulic control lever and the operator, which is most likely to be operated at that time, will shift, so in this invention, the hydraulic control lever 24 is is fixed to the seat and is configured to move as the seat rotates.

(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 longitudinal movement operating lever 35 that moves the seat 32 back and forth, and a seat rotation lever 3 that horizontally turns the seat 32 from side to side.
4 and a hydraulic control lever 24 for operating the lift arm 16 for raising and lowering the work machine are arranged on the operation column 33 part integrally provided with the seat 32, and the hydraulic control lever 24 for operating the lift arm 16 for raising and lowering the work machine is arranged in the operation column 33 part integrally provided with the seat 32, and The hydraulic control valve 41 for seat longitudinal movement, the hydraulic control valve 40 for seat rotation, and the hydraulic control valve 44 for lifting and lowering the working machine, which control the pressure oil to the lifting hydraulic cylinder 42, can be remotely controlled.

In addition, the backrest 3 of the seat 32 is attached to the operation column 33.
A backrest rotation operating lever 54 for rotating the backrest rotation 2b back and forth is also provided, and a backrest rotation hydraulic control valve 53 that controls pressure oil to the backrest rotation hydraulic cylinder 52 can be remotely controlled. be.

(E) Embodiment The purpose and structure of the present invention are 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 front axle bracket 3 is fixed to the front lower part of the engine 2. A front wheel differential case 4 and a front axle are supported on the front axle bracket 3,
Front wheels 5.5 are supported at the tip of the front axle.

A clutch housing 6 is fixed to the rear surface of the engine 2, a transmission case 8 is fixed to the rear surface of the clutch housing 6, and a rear axle case 9 is further fixed to the rear surface of the transmission case 8. Rear axle housing 1 on both sides of rear axle case 9
A rear axle housing 10 supports a rear axle 11, and a rear wheel 12 is provided at the tip of the rear axle 11.
is permanently installed.

A front wheel power extraction gear box is provided on the lower surface of the transmission case 8, and power is transmitted to the front wheel differential case 4 through a power transmission shaft inside the safety case 7. A step 27 is provided over the side surfaces of the clutch housing 6 and the transmission case 8, and an auxiliary step 28 for getting on and off is provided at the tip of the step 27. Also, a clutch pedal 2 is installed in front of the step 27.
2 is provided.

At the rear of the rear axle case 9 is the PTO shaft 17.
A three-point link type work machine mounting device is provided which protrudes from the top link 13 and two lower links 14L and 14R. A rotary tilling device or the like is attached to the three-point link type working machine mounting device, and is raised and lowered by a lift arm 16 via a lift link 15.

As shown in FIG. 4, the lift arm 16 is moved up and down by a piston 43 in the hydraulic case 18 and a hydraulic cylinder 42 for lifting and lowering the work equipment, and the pressure oil in the hydraulic cylinder 42 is used to lift and lower the work equipment on the hydraulic case 18. It is controlled by a hydraulic control valve 44. A hydraulic pump 48 provided on the side of the engine 2 supplies pressure oil to the hydraulic case 18.
The lubricating oil is sucked in from the bottom of the rear axle case 9 through a pipe 56, and the pressure is increased to high pressure as hydraulic oil.
supplies pressure oil to.

A main shift lever 20 and a sub-shift lever 21 are provided on the transmission case 8, and since these shift levers are operated while looking ahead, they are provided at the front lower part of the seat 32. 23 is a front wheel drive clutch lever, 19 is a steering handle, 25 is a fender, and 26 is an assist bar.

Figure 2 is a side view of the seat device of the present invention, Figure 3 is a partial front sectional view, Figure 4 is a hydraulic circuit diagram of the present invention, and Figures 5, 6, and 7 are backrests. It is a drawing which shows another example of rotation.

The hydraulic case 18 is provided with a hydraulic control valve 44 for lifting and lowering the work machine that rotates the lift arm 16, a hydraulic control valve 53 for rotating the backrest, a hydraulic control valve 40 for rotating the seat, and a hydraulic control valve 41 for moving the seat back and forth. The spools of these hydraulic control valves 40, 41, 44, and 53 are configured to be remote controllable. Operation column 33
It is remotely controlled by the four operating levers 34, 35, 54, and 24 on the top.

The hydraulic control lever 24 remotely controls a spool of a hydraulic control valve 44 for lifting and lowering the working machine using a remote control wire in order to move the lift arm 16 up and down. The seat rotation lever 34 operates the spool of the seat rotation hydraulic control valve 40, and the rotation hydraulic cylinder 29 rotates the seat 32. The seat longitudinal movement operating lever 35 operates the spool of the seat longitudinal movement hydraulic control valve 41, and the seat 32 is moved longitudinally by the longitudinal movement hydraulic cylinder 30.

The backrest rotation operation lever 54 operates the spool of the backrest rotation hydraulic control valve 53, and the backrest rotation hydraulic cylinder 52 rotates the backrest 32b of the seat 32.
Rotate.

Four operating levers are arranged side by side on the operating column 33, and these levers are connected to the seat 3 by the support rod 31 so that they move together as the seat 32 rotates back and forth.
It is fixed at 2.

The rotating hydraulic cylinder 29 is pivotally connected to a rotating arm 39a of a pivot support 39, and the rotating arm 39a is
By pushing and pulling 9a, it rotates about 90 degrees. The pivot body 39 has a thrust bearing 36 at the bottom.
The lower part of the hydraulic cylinder 52 for rotating the backrest is also mounted on the rotating plate 60.
0, and the rotating plate 60 is fixed on the seat 32.
Rotates as the rotates.

The rotating plate 60 is inserted into the sliding rail plate 37 via a thrust bearing 36. Sliding rail plate 3
U-shaped bent portions are formed at the left and right ends of 7, into which four rollers 38 are fitted. The roller 38 is supported by a roller support 55, and the roller support 55 is fixed on the hydraulic case 18. The longitudinal hydraulic cylinder 30 is pivotally connected to a roller support 55 at one end and a sliding rail plate 37 at the other end. The rotating hydraulic cylinder 29, the longitudinal hydraulic cylinder 30, and the backrest rotating hydraulic cylinder 52 are constituted by reciprocating hydraulic cylinders.

The back rest 32b in FIG. 2 is rotated as shown by the chain line by a hydraulic cylinder 52 for rotating the back rest. When rotated to its maximum angle, it will not touch the operator's back. The seat 32a is also configured to rotate to a certain extent with the rotation of the backrest 32b, and is configured not to rotate much more than that.

In the embodiments shown in FIGS. 5, 6, and 7, a hydraulic cylinder 58 for rotating the backrest is provided, a rack 59 is provided at the tip of the piston, and a pinion 66 is provided at the lower end of the backrest 32b to rotate the backrest. It is configured to rotate. The head rest 32c is also configured to be vertically adjustable.

In FIG. 4, a hydraulic pump 48 installed on the side of the engine 2 absorbs lubricating oil at the bottom of the rear axle case 9 as hydraulic oil through a pipe 56, converts it into pressurized oil, and sends it to the hydraulic case 18 through a high-pressure pipe 57. .

Hydraulic pump 48 and hydraulic control valve 44 for lifting and lowering work equipment
A hydraulic pressure extraction switching valve 45 is provided between the hydraulic pressure extraction holes 46 and 47 to supply pressure oil to working machines such as front loaders and backhoes.

Other pressure oil extraction holes 49, 50, and 5 are connected between the oil pressure extraction switching valve 45 and the hydraulic control valve 44 for lifting and lowering the work equipment.
1, the pressure oil outlet hole 49 is connected to the hydraulic pressure control valve 41 for seat back and forth movement, the pressure oil outlet hole 50 is connected to the seat rotation hydraulic control valve 40, and the pressure oil outlet hole 51 is connected to the hydraulic pressure control valve 41 for seat rotation. It is connected to the control valve 53.

The hydraulic control valves 40, 41, and 53 are configured to move the spool using a solenoid, and the solenoid is controlled by being energized by three operating levers 34, 35, and 54 via a limit switch.

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

First, since work is carried out using a working machine attached to the rear of a tractor or the like while moving forward, the operator must frequently look back at the rear for monitoring purposes.

At this time, if the seat 32 does not rotate horizontally, it is necessary to twist the operator's body or neck, causing injury to the operator's lower back or neck.

Traditionally, seats have been equipped with mechanisms to horizontally rotate or move them back and forth, but the locking devices had to be mechanically removed and then the seat was moved by the operator's force, making it difficult to move the seat. It was impossible to adjust the position while holding the handle inside.

The present invention has improved on this point and is configured to move the seat back and forth, horizontally, and rotate the backrest using hydraulic equipment, so you can easily move the seat by simply operating the lever lightly with your right hand, which does not hold the handle. This meant that there was no need to twist the body or neck when turning around to monitor what was happening behind the scenes.

Second, by centrally arranging the operating levers in the operating column 33 of the seat 32, and also attaching the hydraulic control lever 24 for operating the hydraulic control valve 44 for lifting and lowering the work equipment, the seat 32 Even when the seat 32 rotates, the hydraulic control lever 24 is placed in a position that feels the same to the operator.
There was no longer any need to search for 4.

Further, since the hydraulic control lever 24 also rotates together with the seat 32, the rotating operator's feet no longer interfere with or come into contact with the stationary hydraulic control lever.

Thirdly, since the backrest 32b, which could not be operated in conventional tractor seats, can be rotated by hydraulic pressure, when there is a high possibility that the operator will turn around, the backrest 32b By keeping the abutment 32b in a nearly released state, the twisting of the body can be reduced.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the agricultural tractor, Figure 2 is a side view of the seat device of the invention, Figure 3 is a partial front sectional view, Figure 4 is a hydraulic circuit diagram of the invention, and Figure 5. , FIG. 6, and FIG. 7 are drawings showing other embodiments of backrest rotation. 16...Lift arm, 18...Hydraulic case,
24...Hydraulic control lever, 29...Rotation hydraulic cylinder, 30...Longitudinal movement hydraulic cylinder, 32
...Seat, 32a...Seat, 32b...Backrest, 34...Seat rotation lever, 35...Seat longitudinal movement operation lever, 40...Hydraulic control valve for seat rotation,
41...Hydraulic control valve for seat back and forth movement, 42...Hydraulic cylinder for lifting and lowering the work machine, 44...Hydraulic control valve for lifting and lowering the work machine, 52...Hydraulic cylinder for rotating the backrest, 53...Hydraulic control valve for rotating the backrest , 54...
Backrest rotation control lever.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Seat longitudinal movement operating lever 35 that moves the seat 32 back and forth, seat rotation lever 34 that horizontally rotates left and right, and hydraulic pressure that operates the lift arm 16 for raising and lowering the work equipment. A control lever 24 is disposed on an operation column 33 integrally provided with the seat 32, and controls pressure oil to the longitudinal hydraulic cylinder 30, the rotational hydraulic cylinder 29, and the work equipment lifting hydraulic cylinder 42, for the longitudinal movement of the seat. A seat device for an agricultural tractor or the like, characterized in that a hydraulic control valve 41, a hydraulic control valve 40 for rotating the seat, and a hydraulic control valve 44 for lifting and lowering a working machine can be remotely controlled. (2) A backrest rotation operation lever 54 for rotating the backrest 32b of the seat 32 back and forth is also attached to the operation column 33 described in claim 1 of the utility model registration claim, and a hydraulic cylinder for backrest rotation is installed. Hydraulic control valve 53 for backrest rotation that controls pressure oil to 52
A seat device for an agricultural tractor, etc., characterized in that it can be remotely controlled.