JP2542374Y2 - Non-rotating device of the handle shaft for adjusting the plowing depth in a rotary tillage device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a device for preventing rotation of a handle shaft for adjusting a tilling depth in a rotary tilling device.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Publication No. 63-12653, a steel ball urged toward a handle shaft via a spring is loosely fitted to a bearing portion rotatably supporting a handle shaft. It is already known that a handle shaft is provided with a recess in which a steel ball resiliently engages.

[0003]

When the rotary tilling device is at the highest position with respect to the tractor, the handle shaft of the known rotary tilling device may contact a part of the tractor or the like. There was a problem.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention makes it possible to adjust the tillage depth by changing the mounting height of the tail wheel by rotating the handle shaft provided with a screw. In the rotary tilling apparatus, the handle shaft is rotatably supported via a bearing mounted on the upper end of the top mast of the working machine, and a handle is provided rotatably at the upper end of the handle shaft. A biasing means for constantly biasing the handle downward is pivotally supported by the handle shaft, and the handle is positioned between the top masts in a rotationally operable position and between the top masts in a non-rotatable position. Rotary tilling wherein the handle is restricted by the inner surfaces of both top masts in a position where the handle is not operable to rotate. Tillage depth in equipment Detent device section handle shaft.

[0005]

In order to adjust the cultivation depth, as shown in FIG. 1, the cultivation depth adjustment handle is turned from the "A" position to the "B" position against the spring, and then rotated to operate. Adjust

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described with reference to one embodiment shown in FIGS. Reference numeral 1 denotes a tractor main body, and a rotary tilling device 3 is attached to the rear of the tractor via a three-point link mechanism 2 so as to be able to move up and down. 4 and 4 are rotary tillage parts a
And a movable frame 5 supporting the tail wheels 4, the front end b of which is rotatable up and down to the fixed frame 6 side. Supported. Reference numeral 7 denotes a handle shaft for adjusting the plowing depth, which is rotatably supported by a bearing 9 mounted on the upper ends of the top masts 8a and 8b. A male screw to be screwed into the female screw tube 10 is engraved,
The upper end has a base flange portion 7 of the operation handle 7b.
c is integrally fixed via a roll pin 11, and the handle shaft 7 is configured not to be pulled out of the bearing 9. By rotating the handle 7b, the height of the tail wheels 4, 4 can be changed to freely adjust the plowing depth.

In the figure, reference numeral 12 denotes a leaf spring, which is a pin 12a.
During the rotary tilling work that is wound around the outer periphery of the turret and does not use the cultivation depth adjustment handle 7b, the handle 12b is always moved downward from above by the spring 12 so that the top mast 8
The plate 13 is rotationally urged between a and 8b. 14
Is a hydraulic lift arm, 15 is a lift rod, 16 is a rotary cover, 17 is a transmission chain case, and 18 is a fuel tank.

In the above construction, when tilling work is performed, the handle 7b is first rotated to position the tail wheels 4, 4 at the height of the tail wheels 4, 4 so that the cultivation depth can be adjusted to the working conditions and crops to be planted. As shown in FIG. 1, the cultivation depth adjusting handle 7b is moved from the "B" position to the "A" position against the spring 12.
The handle 7b is turned at right angles to the base flange 7c as shown in FIG. The tail wheel 4 is moved up and down via 4a and 4b to adjust the tillage depth.

If the tilling operation is started in this state, careless rotation of the handle shaft 7 due to vibration or the like is reliably prevented. In particular, when the tractor moves, etc., the rotary tilling device 3 is lifted from the ground so that the vehicle travels.
The handle shaft 7 is easy to turn by itself in combination with the fact that the handle 4 is away from the ground. However, in the present invention, since the spring 12 presses the handle 7b from above, there is no such inconvenience.

In the position where the tillage depth adjusting handle 7b cannot be rotated, as shown in FIG. 3, the tillage depth adjusting handle 7b is mounted below the line AA connecting the handle bearing 9 and the top link mounting fulcrum 20. ing.

In this embodiment, the handle 7 is urged between the top masts 8a and 8b, but may be urged to another position.

[0012]

In summary, the present invention relates to a rotary tilling apparatus which can adjust a tillage depth by changing a mounting height of a tail wheel by rotating a handle shaft provided with a screw. The handle shaft is rotatably supported via a bearing mounted on the upper end of the top mast of the working machine, and a handle is provided rotatably at the upper end of the handle shaft, and the handle is constantly urged downward. Pivoting means on the handle shaft,
The handle can be selectively switched between a pivotally operable position located above the top mast and a non-rotatable position located between the top masts, and the handle is in a non-rotatable position. Since the handle is configured such that the rotation of the handle shaft is restricted by the inner surfaces of both top masts, the tillage depth set during the rotary tillage work is not disturbed by vibration or the like, and Even when adjusting the tillage depth, the operating load of the handle is relatively light, and when the tillage depth cannot be adjusted by the handle, the spring is always below the line connecting the handle bearing and the top link mounting fulcrum by the spring. As shown in FIG. 5, even when the rotary tilling device is at the highest position with respect to the tractor, it comes into contact with the fuel tank of the tractor as shown in FIG. It is intended to achieve the very practical effect of reliably preventing and.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a tillage depth adjusting handle of a rotary tillage device.

FIG. 2 is a plan view of a main part of a tillage depth adjusting handle of the rotary tillage device.

FIG. 3 is a side view of a main part of the rotary tillage device.

FIG. 4 is a side view of the rotary tillage device.

FIG. 5 is a side view of the rotary tilling device at the highest position with respect to the tractor.

[Description of Signs] 3 Rotary tillage device 4 Tail 7b Tillage depth adjustment handle 12 Spring 13 Plate

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotary tilling apparatus in which the height of a tail wheel is changed by rotating a handle shaft provided with a screw to adjust a cultivation depth. The handle is rotatably supported via a bearing mounted on the upper end of the top mast, and is provided with a rotatable handle at the upper end of the handle shaft, and biasing means for constantly biasing the handle downward. The handle is pivotally supported on a shaft, and the handle can be selectively switched between a pivotally operable position located above the top mast and a non-rotatable position located between the top masts. A rotation preventing device for a tillage depth adjusting handle shaft in a rotary tillage device, wherein the rotation of the handle shaft is restricted by the inner side surfaces of both top masts in a rotation operable position.