JPS6211216Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a backward travel restraining device for a power tiller, which is capable of moving the running wheels of the machine body in the longitudinal direction with respect to the machine body.

Conventionally, the axle of the running wheel in a tiller was configured to be able to move in the front and back direction with respect to the machine body, and when lifting the tiller attached to the machine body when turning the machine, etc., the axle was moved rearward. It is known that the front side of the machine is made heavier to make it easier to lift, thereby reducing the burden on the operator. However, if you accidentally drive backwards with the axle moved backwards, the rear of the aircraft will be lifted along with the drive reaction force, resulting in a so-called leaning forward state, which will greatly disrupt the running balance and be very dangerous. It was hot.

The present invention was devised in order to eliminate these drawbacks in view of the above-mentioned actual situation.The present invention has been devised in order to eliminate these drawbacks. By configuring the system so that it cannot run backwards unless the running wheels are moved forward, safety can be ensured when running backwards even though the running wheels move forward and backward, and the running balance can be maintained. To provide a backward travel restraining device for a tiller, which allows safe work without collapsing the tiller.

The structure of the present invention will be explained with reference to an embodiment shown in the drawings. 1 is a body of a walking cultivator, and an axle case 3 is pivotally supported at the lower part of a transmission case 2 of the body 1. It is pivotally mounted around a shaft 4 so as to be swingable back and forth. Reference numeral 5 denotes a hydraulic cylinder whose one end is attached to the axle case 3 and the other end is attached to the aircraft frame 1a, and the hydraulic cylinder 5 is interlocked and connected to a hydraulic valve 7 installed inside the traveling aircraft 1 via a hydraulic pipe 6. ing. On the other hand, the hydraulic valve 7 is
A wheel operating lever 1 is pivotally supported on the free end of the operating handle 8 via a connecting rod 9 provided along the operating handle 8 that projects rearward.
It is linked to 0. When the operating lever 10 is rotated from the neutral position A to the B position, the connecting rod 9 moves rearward to operate the hydraulic valve 7, thereby extending the hydraulic cylinder 5 and moving the axle case 3 rearward. When the axle case 3 swings, and conversely rotates from the neutral position A to the C position, the axle case 3 swings forward. Reference numeral 11 denotes left and right running wheels mounted on the axle case 3.

Reference numeral 12 denotes a travel speed change lever provided on the driving handle 8; 13 represents a speed change panel in which a speed change guide groove 14 is formed to guide the speed change operation of the travel speed change lever 12; It has a substantially H-shape formed parallel to 9.
The reverse position and the high speed position are notched on the connecting rod 9 side, and the low speed position and the medium speed position are notched on the side opposite to the connecting rod 9 centered on the neutral position. Reference numeral 15 denotes a reverse stopper fixedly attached to the connecting rod 9. The reverse stopper 15 has a substantially L-shape in plan view, and when the operating lever 10 is located at the neutral position A or B position, the traveling speed is changed. The shift operation of the lever 12 to the reverse position is restrained, and only when the operating lever 10 is located at the C position, the restraint is released and the traveling shift lever 12 can be operated to shift to the reverse position. Reference numeral 16 denotes a high-speed stopper, which is attached to the connecting rod 9 in the same relationship as the retraction stopper 15.

Note that the operating lever 10 is energized toward the neutral position A by a bullet (not shown), and the operating lever 10
is designed to automatically return to neutral position A when it is operated to position B or position C. Further, in the figure, 17 is a tilling machine, 18 is a tilling blade thereof, and 19 is a tilling speed change lever.

Next, the operation of the present invention constructed as described above will be explained. First, when plowing forward, the axle case 3 is positioned at the front so that the rear side of the machine is heavier. When it reaches the edge of a ridge and goes around, it is necessary to lift the tiller 17, but in this case, the wheel operating lever 10 must be moved to the neutral position A.
to position B. Then, the hydraulic cylinder 5 expands and the traveling wheels 11 move rearward. Therefore, the front part of the machine body 1 is heavy, and the operator can easily lift the operating handle 8 and perform a turning operation. When aircraft 1 completes its rotation, press control lever 1.
0 to the C position to move the traveling wheels 11 forward again and perform forward tilling work.

By the way, if it becomes necessary to travel backwards or perform backward tilling work during the above-mentioned tilling work, the traveling speed change lever 12 may be operated to the backward position. In this case, the retreating position is checked by the retreating stopper 15. That is, when the operation lever 10 is located at the neutral position A or the position B where the traveling wheels 11 move backward, the traveling shift lever 12 is restrained by the reverse stopper 15 and cannot be shifted to the reverse position. Therefore, running wheel 1
1 moves backwards and the front of the aircraft becomes heavy, completely preventing it from traveling backwards. To travel backwards, move the operating lever 10 to the traveling wheel 1.
1 moves forward to the C position to release the restraint of the travel shift lever 12 by the backward stopper 15, the travel shift lever 12 can be shifted to the reverse position. Therefore, backward running cannot be performed unless the running wheels 11 are always moving forward, so the running wheels 11
Even if the wheels 11 can be moved in the front and rear directions, there is no possibility of accidentally running backwards with the running wheels 11 moved rearward, thereby significantly increasing safety.

Moreover, the operating lever 10 is designed to automatically return to the neutral position A, so that the travel speed change lever 1
When shifting the travel gear shift lever 12 to the reverse position, the operating lever 10 must be operated to position C, which further improves safety. Also, even if the operating lever 10 is moved to position B where the travel wheels 11 move backward after the travel gear shift lever 12 is shifted to the reverse position, it cannot be moved to position B because the reverse stopper 15 is restrained by the travel gear shift lever 12 in the reverse position, and safety in this case can be ensured.

Note that the high-speed position is checked by the high-speed stopper 16 as well as the reverse position, so similarly to the reverse stopper 15, the travel shift lever 12 cannot be shifted to the high-speed position unless the traveling wheels 11 have moved forward. It cannot be operated. Therefore, even when moving forward at high speed when traveling on the road, the vehicle can run stably without losing its running balance.

In summary, the present invention provides a power tiller in which the running wheels are configured to be movable in the longitudinal direction relative to the machine body, in which a stopper for checking the reverse gear shift of the traveling transmission device is interlocked and connected to a wheel operating lever for moving the running wheels back and forth. The stopper is configured to release the check on the reverse gear shift of the traveling transmission device and enable the reverse gear shift only when the wheel operating lever is located at a forward movement operation position other than the neutral position and the rear movement operation position of the traveling wheels. Therefore, when the aircraft is turning, the traveling wheels are moved rearward to make it easier to lift the rear part of the aircraft, but when the traveling wheels are moving backwards, the traveling transmission It is possible to completely prevent backward travel by restraining the reverse gear shift operation with a stopper connected to the wheel operating lever, and moreover, the restraining operation of the stopper is linked to the operation of the wheel operating lever to the forward movement operating position of the traveling wheels. To automatically release the gear when the vehicle is running backwards, and to be able to shift backwards only when the wheels are positioned in front of the vehicle, thereby ensuring safety when traveling backwards and allowing safe work without losing the running balance. It is something that can be done.

[Brief explanation of the drawing]

The drawings show an embodiment of the backward movement restraining device for a tiller according to the present invention, and FIG. 1 is an overall side view of the tiller, and FIG. 2 is a schematic diagram of the main parts. In the figure, 1 is the fuselage, 9 is the connecting rod, 10 is the wheel operating lever, 11 is the running wheel, 14 is the gear shift guide groove, 1
5 is a stopper.

Claims (1)

[Scope of utility model registration request] In a tiller in which a traveling wheel is configured to be movable in the forward and backward directions relative to a machine body, a stopper for preventing reverse shifting of a traveling transmission is interlocked with a wheel operating lever for moving the traveling wheel forward and backward, and the stopper is
A reverse travel inhibiting device for a tiller, characterized in that the reverse travel inhibiting device of the travel transmission is released and reverse travel transmission operation is possible only when the wheel operating lever is in a forward movement operating position other than the neutral position and the rearward movement operating position of the travel wheels.