JPH042202B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a machine body supported by a propulsion wheel and a grounding body that moves up and down to set the plowing depth of a tilling rotary provided behind the propulsion wheel. A walk-behind tiller that can be steered by a control handle that is attached to the machine body and extends toward the rear.

[Conventional technology]

In a conventional walk-behind cultivator of this type, a wheel case that pivotally supports the propulsion wheel is fixed to the machine body, and the control handle is controlled from the machine body in a vertical position with respect to the machine body. A tilling case extending rearward and having a tilling rotary attached to the wheel case was pivotally supported so as to be swingable up and down (Japanese Utility Model Publication No. 56-77208).

[Problem to be solved by the invention]

Therefore, when the tilling rotary is moved up and down with respect to the aircraft body and the propulsion wheels are fixed to the aircraft body, the tilling depth of the rotary is set and the raising and lowering operation of this ground contact body is stopped. When carrying out work, the propulsion wheels move along the unevenness of the field surface, so the machine, which is supported by the propulsion wheels and the grounding body, tilts significantly back and forth, and as a result, the handle extending to the rear of the machine tilts. It will vary greatly depending on the field.

Therefore, each time the field surface is uneven, the position of the control handle relative to the operator fluctuates relatively significantly up and down, deteriorating its maneuverability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a system that allows the operator to maintain a constant position of the operating handle even when the field surface is uneven, thereby improving operability.

[Means to solve the problem]

The characteristic configuration according to the present invention is that the grounding body is configured to move up and down in response to an operation command from a human operating tool, the aircraft body is provided with an inclination sensor that detects the longitudinal inclination of the aircraft body, and the propulsion wheels are attached to the aircraft body. Further, the manual operation part of the control handle is located above the grounding body, and the propulsion wheels are controlled based on the sensing operation of the inclination sensor to adjust the inclination of the aircraft body in the longitudinal direction. It is configured to automatically control the elevation and lowering to keep it within a certain small range, and its effects are as follows.

[Effect]

When the wheels move up and down due to irregularities on the field surface, based on the grounding point of the grounding body whose lifting operation has been stopped without issuing a manual command, the inclination sensor detects the inclination of the machine and adjusts the forward and backward inclination of the machine. The propulsion wheels move up and down to keep it within a certain small range. Therefore,
In addition to being able to suppress changes in the aircraft's attitude within a certain small range, the inclination sensor allows the wheels to move automatically up and down almost reliably while following uneven surfaces, so changes in the attitude of the handle fixed to the aircraft can also be avoided. do not have.

〔Effect of the invention〕

As a result, there is no change in the relative attitude of the control handle to the operator, and there is little change in the ground height of the handle's hand control part, making it easier for the operator to control the machine. The various clutch levers can also be operated normally.

〔Example〕

As shown in FIG. 5, a pair of left and right propulsion wheels 1,
A self-propelled vehicle with a tiller rotary 2 behind the aircraft 1, an engine 3 at the front of the aircraft, and a fixed control handle 4 with a hand control unit extending toward the rear of the aircraft and positioning the hand control unit above the tail wheel 5, which will be described later. A tail wheel 5, which is one of the grounding bodies arranged to act after plowing by the rotary 2, is connected to the rear end of the machine, and the tail wheel 5 is movable up and down by a drive mechanism 6. , the propulsion wheel 1 is configured to be movable up and down by an elevating mechanism 23, and the propulsion wheel 1 is actuated up and down based on the inclination sensing operation of the inclination sensor 7 which detects the inclination in the longitudinal direction of the aircraft body which is equal to or greater than a set value. Therefore, the walk-behind cultivator is configured to suppress the inclination of the machine body in the longitudinal direction to a certain small range.

As shown in FIG. 3, a lifting mechanism 6 for the tail wheel 5
To be more specific, the support shaft 8 of the tail wheel 5 is fitted into and held in a support tube 9 fixed to the fuselage side, and the threaded shaft 10 screwed into the axis position of this support shaft 8 is inserted into the support tube 9.
The screw shaft 10 is fixed in position within the shaft, and the tail wheel 5 can be slid and operated via the support shaft 8 by the operation of the screw shaft 10. Motor 1 with reducer 12 through
3, a drive mechanism 6 is constructed which can be operated arbitrarily by operating a hand switch 27.

To explain the inclination sensor 7 in detail, as shown in FIG. Disk 1 attached to
Attach a pair of switches 18a and 18b to the weight 16 in a state where they are distributed to the left and right with respect to the weight 16.
switch 1 provided on the support arm 19 that supported the
8 and 18b are extended so as to come into contact with the switch 18a or 18b when the weight 16 swings beyond the reference setting range (B). That is, when the switches 18a and 18b are not activated, the weight 16 is within the reference setting range (B). In other words, the weight 16 will not sense an inclination greater than the set value, and the propulsion wheel 1 elevating mechanism 23 (described later) will not be activated, and even if there are some irregularities on the field surface, frequent propulsion will not be required. It is designed to prevent the wheels 1 from moving up and down.

As shown in FIG. 1, the elevating mechanism 23 is explained in detail. A wheel case 24 with propulsion wheels 1, 1 supported at its lower end is supported on the fuselage frame so as to be vertically swingable around a horizontal support shaft 25. An actuator 26 such as a cylinder is installed between the wheel case 24 and the engine 3 support frame, and when either switch 18a or 18b is activated, the aircraft tilts in the direction in which the switch is installed, and the tilt is Since the value is higher than the set value, switches 18a, 1
8b is transmitted to the actuator 26 via the control circuit 22 to swing the wheel case 24,
By essentially raising and lowering the propulsion wheels 1, the attitude of the aircraft can be suppressed within a certain small range. In this case,
Since the drive mechanism 6 of the tail wheel 5 is controlled by the operation command from the hand switch 27, the tail wheel 5 does not move up or down even if the tilt sensor 7 senses the operation.
Therefore, the height of the control handle 4 from the ground does not change even when the field surface is uneven, so the operability is good.

Describing the plowing depth setting work using the tailwheel 5, as shown in FIG. 4, the switch mounting plate 17 is frictionally fixed to the horizontal support shaft 15 and can be rotated artificially against this frictional force. A water bubble level 21 is provided on the machine body in correspondence with the plowing depth scale 20 provided on the disc 17, and after setting the machine in a horizontal position using the spirit level 21 before starting work, The disc 17 is rotated artificially to set it at the set plowing depth scale,
Furthermore, by turning on and off the hand switch 27 for operating the tail wheel 5, an operation command for raising and lowering the tail wheel is issued, and the tail wheel 5 is raised and lowered until the water bubbles reach the zero scale, so that the rotary 2 reaches the set plowing depth. It is structured as follows.
Therefore, with this setting plowing depth condition, the standard setting range (B)
A weight 16 is located approximately at the center of the field, and as the weight 16 swings according to the unevenness of the field surface, it contacts the switches 18a and 18b and swings the propulsion wheel 1. It has been done.

[Another Embodiment] As the inclination sensor 7, a rotary potentiometer whose electrical output changes continuously by the swinging of the weight 16 may be used.

The grounding body 5 may be sled-shaped.

[Brief explanation of drawings]

The drawings show an embodiment of the walk-behind cultivator according to the present invention, and FIG. 1 is a side view showing the ascending and descending state of the propulsion wheel;
Fig. 2 is a front view of the inclination sensor, Fig. 3 is a partially cutaway side view showing the grounding body drive mechanism, Fig. 4 is a front view showing the plowing depth setting state of the inclination sensor, and Fig. 5 is an overall side view. It is. 1... Propulsion wheel, 2... Tilling rotary, 4...
...Control handle, 5...Grounding body, 7...Inclination sensor.

Claims (1)

[Scope of Claims] 1. A machine body supported by a propulsion wheel 1 and a grounding body 5 that moves up and down to set the plowing depth of a tillage rotary 2 provided behind the propulsion wheel 1, which is attached to the machine body. The walk-behind cultivator is configured to be steerable by a control handle 4 extending toward the rear, and the grounding body 5 is configured to be raised and lowered by an operation command from a human operating tool, and the The fuselage is provided with an inclination sensor 7 for sensing the longitudinal inclination of the fuselage, the propulsion wheels 1 are configured to be able to move up and down with respect to the fuselage, and the control handle 4 is arranged above the ground body 5. and place it in the
The walk-behind cultivator is configured to automatically control the elevation of the propulsion wheels 1 based on the sensing operation of the inclination sensor 7 in order to suppress the longitudinal inclination of the machine body within a certain small range.