JPS63103777A - Automatic adjusting device for height of handle of walking type working machine - Google Patents

Abstract

PURPOSE:To automatically keep the ground clearance of a handle nearly at a definite value at all times by providing a detector for detecting the ground clearance of each position on the front part and rear part of a machine body. CONSTITUTION:When carrying out various operations accompanied by the forward/backward inclination of a machine body 1, e.g., a tilling operation in which the amount of tilling depth is varied, the varied ground clearances H1, H2 of a lower frame 5 and the front part of the machine body 1 are detected by height detectors 14, 13 on the front and rear parts of the machine body, and both detected signals are inputted into a comparison circuit and are relatively operated. As a result, when there is a difference between both, that is, e.g., when the handle 8 is judged to be lowered by the fact that the lower frame 5 is lowered while, on the contrary, the front part of the machine body 1 is lifted up with a traveling wheel 12 as a fulcrum due to a largely set amount of tilling depth, the amount and direction are sent to a handle driving source 16 via an output circuit 18. As a result, a lateral shaft 7 is rotated via a worm 21 and a worm wheel 22, to lift up the handle 8, thereby keeping the ground clearance H of the handle 8 at a defined value.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an automatic handle height adjustment device for a walk-behind working machine such as a tiller.

(B) Prior Art Conventional 2 Walking type cultivators are operated by an operator holding the handle, so it is desirable that the height of the handle above the ground is constant; therefore, the height of the handle above the ground is It was configured to be manually adjustable (for example, actual CFJ
Publication No. 171102/1982).

(c) Problems that the invention seeks to solveHowever,
With this type of manual handle height adjustment method, it is necessary to temporarily stop the nine machines each time to perform the adjustment operation, which poses problems such as the adjustment operation being cumbersome.

(d) Means for Solving the Problem Therefore, the present invention provides a walk-behind working machine in which the working machine is installed in the lower frame at the rear of the machine, and the handle is connected to the handle base above it via a horizontal shaft. .

A handle drive source that adjusts the vertical movement of the handle around the horizontal axis, a rear body height detector that detects the height of the lower frame above the ground, and a height detector that detects the height of the front body above the ground. A height detector is installed at the front of the aircraft, and there is a difference in the output from the rain detector.

The signal is sent to the handle drive source to move the handle and maintain the handle at a substantially constant height above the ground.

(e) By having a configuration that exceeds the effect, the degree of inclination of the two aircraft in front and behind is 2.
This can be determined by the front height detector and the rear height detector.
By driving the handle drive source in accordance with the degree of inclination, the height of the handle above the ground can be maintained at a substantially constant level.

(F) Example Hereinafter, a case where the present invention is implemented in a walk-behind cultivator will be described with reference to the drawings.

The walk-behind cultivator has an engine of 3. A lower frame 5. Above the handlebars 6 are connected together to form the fuselage 1,
A handle 8 is movable up and down on a horizontal shaft 7 from a handle base 6 of this machine 1.

Working machines 9 including a tilling rotary 10 and a tail wheel 11 are respectively connected to the lower frame 5, and traveling shafts 12 are mounted on both sides of the front and rear central portions of the two machines 1. and.

The power of the engine 3 is transmitted to the traveling shaft 12 via a transmission mechanism (not shown) in the mission case 4, and is also transmitted to the tilling rotary lO.

By the way, in this invention, the fuselage rear height detector 13 that detects the ground height H□ at the current position at the rear end of the lower frame 5 also detects the ground height H2 at the current position at the front end of the chassis. Nine vehicle front height detectors 1 are installed, respectively.
3. When the controller 15 installed at the appropriate location on the two machines 1 determines that there is a difference in the outputs from 14, it issues an output signal, and a handle drive source 16 is installed in the handle base 6 to be driven in response to the signal. It is being

The rain detectors 13 and 14 are installed at a height Hl above the ground.

A known structure is used that can detect H□ using ultrasonic waves emitted from itself toward the ground, and a nine-vehicle detection signal is sent to a comparison circuit 17 in the controller 15. The nine-vehicle detection signals are subjected to comparison calculations in the comparison circuit 17 and sent to the handle drive source 16 via the output circuit 18.

As the handle drive source 16, a servo motor with a speed reducer or the like is used, which is fixed at a proper position inside the handle base 6 via a continuous member 19, and a worm 21 is fixed to the output shaft 20.
A worm wheel 22 that meshes with the worm 21 is tightly fitted to the horizontal shaft 7, and the power of the output shaft 20 is transferred to the worm 21.
This horizontal shaft 7 is connected via the worm wheel 22 and the horizontal shaft 7.
is transmitted to the handle 8 fixed at the base, so that the handle 8 rotates forward and backward around the axis of the horizontal shaft 7. In addition,
The lower frame 5 also includes a tail wheel drive source 2 such as a servo motor with a reducer.
3 is fixedly installed, and a worm 25 fixed to this output shaft 24 is engaged with a rack 27 attached along the vertical direction of the upper part of the vertical support shaft 26 of the two tail wheels 11, and the power of the output shaft 24 is transferred to the worm 25. ．． The transmission is transmitted via the rack 27 to the vertical support shaft 26 fitted to the lower frame 5 so as to be vertically movable.
can be adjusted up and down. Also.

Forward/reverse rotation amount instructions to the tail wheel drive source 23 are provided by a plowing depth setting device 28 connected to a comparison circuit 17 and a two-body rear height detector 13.
When the comparator circuit 17 determines that there is a difference between the respective outputs, the output circuit 18 outputs the plowing depth, and the plowing depth meter 29 also displays the plowing depth amount at the same time. The plowing depth setting device 28 and the plowing depth meter 29 are attached to the upper left and right sides of a lid-like operation panel 30 that covers the rear opening of the handle base 6, which is shaped like a rectangular tube. A guide groove 32 is formed so that a change lever 31 extending rearward from the transmission case 4 can protrude through the lower side of the handle base 6.

According to the above, when the tilling depth is set using the setting dial of the tilling depth setting device 28 at the start of tilling work, the output is set by the comparing circuit 17.
The signal is sent to the tail wheel drive source 23 via the output circuit 18 and the two tail wheels 11
is the set amount for tilling rotary 10.

The vertical movement is adjusted to reach the set plowing depth. Then.

The respective ground heights H and H2 of the lower frame 5 and the front of the fuselage 1 that have changed accordingly are detected by the fuselage rear height detector 13 and the fuselage front height detector 14, and the two vehicle detection signals are sent to the comparison circuit. It is input to I7 and subjected to comparison calculations.

When there is a difference between the two, i.e. 1. For example, it is determined that the plowing depth is set to a large value, and the lower frame 5 lowers using the running wheels 12 as a fulcrum. 2. On the other hand, the front part of the machine body 1 rises, which causes the handle 8 to lower. When the amount and direction are sent to the handle drive source 16 via the output circuit 18,
Warm 21. The horizontal shaft 7 is rotated via the worm wheel 22 to raise the handle 8, so that the height H above the ground of the handle 8 is always maintained constant. If the plowing depth setting is set to the negative side, the two tail wheels 11 will lower than the tilling rotary 10 as described above, the tilling rotary 10 will rise above the ground, and the height of the handle 8 will also remain constant. Automatically adjusted, it will be possible to easily drive nine times on the road with two machines.

FIG. 4 shows a case where hydraulic cylinders are used as the handle drive source 16 and the tail wheel drive source 23, and each drive source 16.2
3, a hydraulic pump 34 operated by the power of the engine 3 is mounted on the chassis 2, and a tilt angle detector 35 for detecting the longitudinal tilt angle of the body 1. Also, a solenoid valve 36 is mounted on the handle base 6. A controller 37 and a setting device 38 are each mounted.

In addition to the plowing depth, the setting device 38 can also set the height of the person who is raking the handle 8.
When both are set, the comparator circuit of the controller 37 compares and calculates each set amount with the detection signal from the tilt angle detector 35, and the determined amount and direction are sent from the output circuit to the electromagnetic valve 36, and each The drive source 16° 23 is adjusted to expand and contract, and the height of the handle 8 above the ground is changed so that the height H of the handle 8 above the ground is suitable for the operator, and the height H remains constant even when the plowing depth changes. It will be held constant.

(G) Effects of the Invention In addition to the effects of the invention, this invention provides detectors 13. When there is a difference in the output, the signal is sent to the handle drive source 16 and the handle 8 is moved to maintain the height H above the ground of the handle 8 almost constant. Therefore, various operations that involve tilting the two aircraft 1 back and forth are possible. 2. For example, when performing plowing work that changes the plowing depth or when driving on a slope, the height H above the ground of the handle 8 can be automatically maintained at an optimal constant level. In addition, even when turning with the rear part of the machine 1, where the work equipment is located, raised, the height H above the ground of the handle 8 is maintained constant, so there is no need to lift the heavy machine 9 with the handle 8, and the handle 8 can be operated. The user can move around easily, and the operating section is in a low position in case of an unexpected situation.

It can be operated quickly and instantly.

[Brief explanation of the drawing]

Figure 1 is a side view of a walk-behind cultivator embodying the present invention, Figure 2 is a rear view of the operation panel, Figure 3 is a block diagram of the automatic adjustment device, and Figure 4 shows a hydraulic cylinder using a hydraulic cylinder as the handle drive source. FIG. (Symbol) 1.. Machine body 5.. Lower frame 6.. Handle base 7.. Horizontal axis 8 -.. Handle 9.. Work equipment 13.. Machine rear height detector 14.. Machine front height detection. Unit 16: Handle drive source H: Height of the handle above ground H: Height above the ground of the lower frame H2: Height above the ground at the front of the aircraft

Claims (1)

[Claims] Walking type work in which a work machine (9) is installed on the lower frame (5) at the rear of the machine (1), and a handle (8) is connected to the handle base (6) above it via a horizontal shaft (7). A handle drive source (16) for adjusting the vertical movement of the handle (8) around the horizontal axis (7), and the lower frame (5).
The aircraft rear height detector (H_1) detects the ground height (H_1) of
13) and a fuselage front height detector (14) that detects the ground height (H_2) of the front part of the fuselage (1), and the output from both detectors (13) and (14) is When there is a difference, a signal thereof is sent to the handle drive source (16) to move the handle (8) to keep the height (H) of the handle (8) above the ground substantially constant. Automatic handle height adjustment device for mold work machine.