JPS60724Y2 - walk-behind tiller - Google Patents

Description

[Detailed description of the invention] This invention consists of a frame equipped with a connecting part to the walking type traveling aircraft and an input shaft at the rear of the walking type traveling aircraft which is equipped with a propulsion wheel at one location in the front and back direction when viewed from the side. Regarding a walk-behind cultivator in which a rotary tiller is connected to a rotary tiller comprising a rotary case whose base end side is attached to the frame via a rotary case and a tiller claw body attached to the free end side of the rotary case, when turning, The purpose is to swing the traveling machine forward around the axis of the propulsion wheels to reduce the operating force required to keep the tilling device elevated above the ground, making it easier to turn. be.

As mentioned above, in the above-mentioned walk-behind tiller, when turning, the traveling machine body is held in a state of swinging forward around the wheel axis, but this tiller is not able to handle the tilling reaction force during normal tilling work. In order to prevent the entire aircraft from rotating forward about the wheel axis, the tilling device is installed at a position far away from the traveling aircraft, and the weight of the tilling device is used to rotate the entire aircraft. Since the aircraft is biased to rotate rearward about the wheel axis, it requires a large amount of operating force to keep the entire aircraft in a forward rotation state during the turn, so it is difficult to turn smoothly. There was a difficult problem.

The present invention was made keeping in mind the above actual situation,
In the walk-behind cultivator having an official structure, the rotary case is configured to be swingable back and forth within a certain angle range around the input shaft with respect to the frame, and the rotary case is forcibly swung toward the rear of the machine body. A forward and backward movement operating mechanism is provided that can freely switch the working state of the tilling device between a first state and a second state in which the forced rocking is released and the rotary case is allowed to freely swing forward. The power operating mechanism is linked to the operating tool of the transmission clutch so that the power transmission clutch for power on/off for the tilling device enters the first state when the power transmission clutch is engaged, and enters the second state when the power transmission clutch is turned off. A special feature of this feature is that when the tilling device is moved forward, the force that urges the entire machine body to rotate backwards around the wheel axis is reduced, causing the entire machine body to lift the tilling device off the ground. Focusing on the point that the force required to maintain the tiller in the forward rotation state is reduced, and the point that the power transmission clutch of the tiller is always disengaged to ensure safety when turning to raise the tiller from the ground, A rotary case of the tilling device is configured to be swingable back and forth, and the rotary case is always urged toward the rear of the machine body while the tilling device is being driven using power to the rotary case, and Since the biasing force is configured to be released in conjunction with a clutch disengagement operation that continues driving the tilling device,
During normal plowing work, the entire aircraft is reliably prevented from rotating forward unexpectedly, and when turning, the operating force required to maintain the entire aircraft in a forward rotating state can be reduced.
In addition, it eliminates the need for special operations to move the tilling device back and forth, thereby avoiding complicated operations.
As a whole, a walk-behind cultivator that can be used extremely conveniently has been obtained.

Embodiments of the present invention will be described in detail below based on the drawings.

Figure 1 shows the side view of the walk-behind cultivator, Ensif Ltf.
A walking-type traveling aircraft 5 equipped with a handle 2, a traveling mission case 3, and a pair of left and right propulsion wheels 4, 4, etc. supported at the bottom of the case 3 at one location in the front and back direction when viewed from the side. At the rear of the frame 7, a frame 7 is provided with a connecting part to the walking-type traveling body 5, a rotary case 6a whose proximal end is attached to the frame 7 via an input shaft 8, and a large number of parts are attached to the lower part of the rotary case 6a. A rotary tilling device 6 which is formed by pivotally supporting a tilling claw body 6b equipped with tilling claws.
6 are connected and equipped.

As shown in FIGS. 1 and 2, the rotary case 6a of the tilling device 6 is attached to a frame 7 extending rearward from the machine body 5, and the upper end of the rotary case 6a is rotatable around a horizontal axis X. It is pivotably supported by and is configured to be swingable back and forth about the horizontal axis X.

and an input shaft 8 whose axis is aligned with the horizontal axis X;
The tilling claw body 6a is switched between the operating state and the stopped state by the on/off of the transmission clutch 12 provided between the output shaft 11 of the chain transmission mechanism 10 installed in the transmission case 9 that transmits the power from the mission case 3 rearward. The configuration is configured to be switched between the states.

The transmission clutch 12 includes a driven body 12a with an occlusal protrusion fixed to the input shaft 8, and a drive body 12 with an occlusal protrusion connected to the output shaft 11 by a spline so as to be movable in the axial direction.
A shift fork 19 is provided on the periphery of the driving body 12b and extends from an operating lever 13 that is pivotally supported on the transmission case 9 so as to be swingable from side to side. are engaged and connected.

Further, it is configured to be inputted by swinging the lever 13 left and right.

In order to swing the tilling device 6 back and forth, a back-and-forth operation mechanism described below is provided.

That is, a rotary body 14 spline-connected to the input shaft 8 that contacts the side of the upper pivot portion of the rotary case 6a, and a spring 15 that presses the rotary body 14 against the rotary case 6a are provided. , a first state in which the rotary case 6a is swung backward by the rotational operation and frictional force of the rotary body 14, and a state in which the rotary case 6a is in a state where it is floating above the ground when the rotary body 14 is brought to a rotational stop state.
It is configured so that it can be switched to a second state in which it swings forward by its own weight.

The rotating body 14 is configured to rotate and stop rotating by turning on and off the transmission clutch 12.

In the figure, reference numerals 16a and 16b are stoppers that receive and support the arm 17 extending from the rotary case 6a to restrict the swing range of the rotary case 6a.

Moreover, 18 in the figure is a damper that suppresses the backward movement speed of the tilling device 6 to a slow speed.

[Brief explanation of the drawing]

The drawings show an embodiment of the walk-behind cultivator according to the present invention.
The figure is an overall side view, and FIG. 2 is an exploded vertical rear view showing the mounting portion of the longitudinal movement operating mechanism. 4... Propulsion wheel, 5... Traveling body, 6
...Rotary tillage device, 6a...Tary case, 6b...Tilling claw body, 7...
Frame, 8...Input shaft, 12...Transmission clutch, 13...Operation tool.

Claims (1)

[Scope of utility model registration request] In a side view, a frame 7 equipped with a connecting part to the walking type traveling body 5 is attached to the rear part of the walking type traveling body 5 which is equipped with a propulsion wheel 4 at one location in the front and rear direction, and a frame 7 is connected to the proximal end side via an input shaft 8. This is a walk-behind cultivator in which a rotary tiller 6 is connected to a rotary tiller 6 which is composed of a rotary case 6a attached to the frame 7 and a tiller claw body 6b attached to the free end side of the rotary case 6a. The case 6a is configured to be able to swing back and forth within a certain angle range around the input shaft 8 with respect to the frame 7, and a first state in which the rotary case 6a is forced to swing toward the rear of the aircraft body, and a first state in which the rotary case 6a is forced to swing toward the rear of the aircraft body; A forward and backward movement operating mechanism is provided which can freely switch the working state of the tilling device 6 between a second state in which the rotary case 6a is released and allows the rotary case 6a to freely swing forward. The first state occurs when the power transmission clutch 12 for power on/off for the tilling device 6 is engaged, and the second state occurs when the power is cut off.
the operating tool 13 of the transmission clutch 12 so that the
A walk-behind tiller characterized by being linked to.