JPS5834961Y2 - Hokougatakouunki - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a walk-behind cultivator in which a rotary device is connected to the rear of the tiller body, which is equipped with an engine, a transmission case that pivotally supports running wheels at the bottom, and a control handle. Concerning safety techniques during back tilling.

If a worker falls during back tilling, he or she will be seriously injured by the rotating tilling claws, so generally speaking,
As shown in the technique described in Publication No. 8654, when the rotary cover that covers the rear part of the tilling claw hits the foot and the cover is displaced more than a certain amount towards the tilling claw, this is detected and the drive of the rotary device is cut off. Tsube (Katsube)

However, with this structure, when the foot that is in contact with the rotary cover is removed, the tilling claws rotate as the rotary cover recovers, so for example, when back tilling, the worker may lose his balance and fall, causing his foot to fall. When the rotary cover hits the tiller, the tilling claws stop, and when the worker gets up, he tries to move the machine that gets in the way forward...
If you lift the rotary device by pushing the handle forward, your foot may accidentally get stuck under the rotary cover.
When the rotary cover was restored, the tiller claws would rotate, causing serious injury.

The present invention improves safety by preventing the tilling claws from rotating even when the rotary cover is restored, and also prevents the tilling claws from rotating even when the rotary cover is restored. The purpose is to solve problems.

The feature of the walk-behind cultivator of the present invention is that it detects displacement of the rotary cover covering the rear part of the tilling claw toward the tilling claw beyond a certain level, cuts off the drive of the rotary device, and maintains the rotary device in a stopped state. The rotary device is configured to have a stop state of the rotary device in conjunction with the displacement of the cover toward the tilling claw beyond a certain level, and is provided with an indicator that displays the stopped state of the rotary device, and this configuration provides the following effects. .

That is, since the rotary device is configured to detect displacement of the rotary cover toward the tilling claw side beyond a certain level and hold the rotary device in a stopped state, unlike the conventional structure described at the beginning,
When back tilling, if a fallen worker gets up and lifts the rotary device by pushing the handle forward with the intention of moving the machine forward that is in the way,
Even if a foot accidentally gets stuck under the rotary cover, the tiller claws do not rotate, making it possible to avoid serious injury.

If the rotary device is configured to hold the rotary device in a stopped state by detecting displacement of the rotary cover toward the tilling claws by a certain amount or more in this way, there are disadvantages described below.

In other words, when back tilling, if your foot hits the cover just before the rotary device stops due to straw wrapping around the tilling claw shaft, is the rotary device stopping due to the load or due to your foot hitting the cover? There are times when it is difficult to determine whether something is real or not.

In other words, if the tilling claw rotates when the rotary cover is restored as in the past, the tilling claw rotates when the cover is restored, so the stoppage of the rotary device is due to factors other than the foot hitting the rotary cover. In other words,
It can be determined that the tiller is stopped due to straw wrapped around the tiller, but it is difficult to determine if the rotary device is held in a stopped state.

Therefore, if the rotary device is stopped due to straw wrapped around the tilling claws, but the worker mistakenly thinks that the rotary device has stopped due to his foot hitting the rotary cover, the worker may casually lift the rotary device. In such cases, the sudden load reduction caused by lifting the rotary device causes the tilling claws to rotate with the straw still wrapped around them, causing the operator to lose his balance and come into contact with the rotating rotary device, causing serious injury. However, according to the present invention, when the rotary cover is displaced to the tilling claw side by more than 2 degrees, an indicator is provided to display the cutting state of the rotary device in conjunction with this, so that the rotation of the rotary device is stopped. If it stops, you can determine whether it is because your foot accidentally hit the rotary cover or whether the rotary device is stopped due to the load on the tiller claws. By using the results as a guide, you can prevent the aircraft from being lifted up carelessly.

This prevents the rotary claw from rotating with the straw wrapped around it due to the reduction caused by lifting the rotary device, and the worker losing his balance due to the reaction and causing serious injury by touching the rotating rotary device. I was able to do it.

Embodiments of the present invention will be described below with reference to the drawings.

The figure shows a power tiller main body A consisting of an engine 1, a transmission case 3 that pivotally supports running wheels 2, 2 at the bottom, a steering handle 6, etc., at the rear of the power tiller main body A, and a rotationally driven tiller claw 4 at the bottom of a transmission case 5. This figure shows a walk-behind cultivator in which a rotary device B supported by a shaft is connected and arranged, and the rotary device B and main body A are connected via a hitch connecting portion 7 (see FIG. 2).

Further, the rotary device B is provided with a rotary cover 8 that covers the rear part of the tilling claws 4.

As shown in FIG. 2, the rotary cover 8 is pivotally connected to the rear end of the rotary frame 9 so as to be able to swing back and forth, and is also pivotally connected around the vertical axis Y to the hitch connecting portion. It is interlocked and connected to a single-shaped link 10 via a wire 11 and a flexible spring 12.

Then, the tilling claws 4 of the rotary cover 8 have a certain number or more.
Due to the swinging of the single-shaped link 10 due to the sideward displacement, the engine stop switch S is activated at the tip of the single-shaped link 10 to cut off the electrical circuit of the engine 1 or ground the electricity to stop the engine 1. It is configured to be operated in contact.

Further, the cursor-shaped link 10 is configured to be held in a rotational posture around the vertical axis Y by the biasing force of the spring 13.13 for holding unstable switching, so that the tilling claw of the rotary cover 8 The switch S is configured to be brought into contact with the switch S even after the displacement toward the No. 4 side is released.

In addition, the above-mentioned cross-shaped link 10 includes a rod 1 as an indicator.
4 is pivoted.

This rod 14 is constructed so that when the single-shaped link 10 is in contact with the switch S, it largely protrudes from the box body of the hitch connecting portion 7 to inform the operator of the operating state of the switch S. It is configured to also serve as an operating member for moving the link 10 in a direction away from the switch S when it is forcibly pressed.

According to the above configuration, when the worker's foot or the like accidentally comes into contact with the rotary cover 8 and the rotary cover 8 is displaced to the tilling claw 4 side by a certain amount or more, the single-shaped link 10 is activated to activate the engine stop switch S. , the engine 1 will stop, and as a result, the drive of the rotary device B and the wheels 2, 2 will be stopped, and the worker will be prevented from being injured by contact with the tiller claws 4. .

Then, the switch S is connected to the link 1 which is kept unstable.
0, the operating state is maintained and the engine 1 can be reliably stopped.

In addition, in order to start the engine 1 again, the rod 14 protrudes greatly to indicate the operating state of the switch S.
The engine can be started without forgetting to press the rod 14 and switch the switch S to the inactive state.

Note that the display device is not limited to the rod 14, and a sounding device, a lighting device, etc. may be used.

In addition, the display device 14 can be attached not only to the connection part that connects the machine A and the rotary device B, but also to the tiller body A.
The position may be any position above the rotary device B, which is behind the mission case 3 of .

Furthermore, as a method of using the display device 14 according to the present invention, the display device 1
When 4 indicates the switch operation state, the engine starting device may be used so as to be interlocked and checked so that it cannot be operated.

In the above embodiment, the rotary device B and the wheels 2,
The transmission clutch of the wheel 2.2 in the mission case 3 is switched to the disengaged state and held in the disengaged state in conjunction with the displacement of the rotary cover 8 toward the tilling claw 4 side beyond a certain level. At the same time, the transmission clutch in the transmission case 5 that supports the tilling claws 4 may be switched to the disengaged state and maintained.

[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, Figure 2 is a side view showing the interlocking of the rotary cover and engine stop switch, Figures 3 and 4 show the hitch connection, Figure 3 is a side view, and Figure 4 is a plan view. It is a diagram. 1...Engine, 2,2...Traveling wheel, 3...Mission case, 4...Plowing claw, 6...Control handle , 8... Rotary cover, 14... Indicator, A...
... Tiller body, B... Rotary device.

Claims (1)

[Scope of utility model registration request] A cultivator main body A comprising an engine 1, a transmission case 3 that pivotally supports running wheels 2.2 at the bottom, and a control handle 6.
In a walk-behind cultivator in which a rotary device B is connected and installed at the rear of the tiller, a displacement of the rotary cover 8 that covers the rear of the tiller claw 4 on the tiller claw 4 side beyond a certain level is detected, the drive of the rotary device B is cut off, and the rotary device The rotary device B is configured to maintain the rotary device B in a stopped state, and is provided with an indicator 14 that displays the stopped state of the rotary device B in conjunction with the displacement of the cover 8 to the tilling claw 4 side beyond a certain level. A walk-behind tiller.