JPS592646B2 - Hokougatakouunkinoanzensouchi - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a walk-behind tiller in which a rotary device is interlocked with a rotary tiller main body in which a mounted prime mover and a transmission case are interlocked and connected via a tension clutch that is biased towards the clutch disengagement side. In particular, the present invention relates to a safety device in a rotary device that is connected and equipped to a main body.

The above-mentioned rotary device is covered with a cover to prevent tillage mud from scattering and to prevent workers' feet from accidentally entering the rotary device and causing contact damage. It has not yet been possible to reliably avoid this.

In other words, by adjusting the tillage depth of the rotary device, etc.
Since there is an opening between the lower edge of the cover and the mud surface, it is easy for feet etc. to accidentally enter through this opening, and the same problem is noticeable when lifting the rotary device and moving it around. occurs in

For this reason, conventionally, it has been considered to solve the above problem by configuring the upper and lower positions of the lower edge of the cover to be adjustable, but it is difficult to reliably close the opening, and it is difficult to It is troublesome to adjust the cover every time the depth is adjusted.

Therefore, the present invention rationally configures a rotary cover that covers the rear part of a rotary device to detect when a worker's foot or the like unexpectedly approaches the rotary device, and based on this detection result, This is an attempt to solve the above problem by disengaging the tension clutch that interlocks and connects the transmission case and the rotary device, thereby stopping the drive of the rotary device. This aims to improve safety by effectively utilizing the clutch to reliably and quickly stop the drive of the convex tally device.

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

The figure shows a front frame 1 on which a mounted prime mover E is mounted, and a machine-side mission case 3 that connects this front frame 1 and receives power from the prime mover E and transmits the power to a pair of left and right drive wheels 2, 2. and a control handle 4 that controls aircraft operation.
This figure shows a walk-behind cultivator in which a rotary device B is detachably connected to a main body A through a rear hitch 5, and the rotary device B receives power through a transmission case 36 connected to a transmission case 8. In addition to transmitting power, a rigid rotary cover 6 made of a hard plate material is pivotally suspended from the rear part in the direction of movement of the machine by means of a hinge connection so as to be able to swing back and forth.

Further, power transmission between the prime mover E and the transmission case 3 is achieved through large and small pulleys fixed to the output shaft 7 of the prime mover E, and fixed to the input shaft 8 of the mission case 3 in correspondence with the large and small pulleys. Bell l-911 between the pulley
0 is wound and the tension arm l'l, 1
A tension clutch 15 is provided with tension pulleys 13 and 14 that selectively come into contact with and separate from the belts 9 and 10 by means of an alternative selective swing of the tension arm 1L12. .
with springs 17 and 18, tension pulley 13
and 14 in the direction away from the belts 9 and 10, so that the clutch is always in the disengaged state, and each tension arm 11 and 12 is configured to act as an operator attached to the control bundle 4 of the tiller main body A. The lever 19 is configured to be brought into the clutch engaged state by being forcedly and selectively swung via a linking device by a combined swiveling operation of the left and right and front and back sides of the lever 19.

That is, as shown in FIGS. 2 and 3, the base of each tension arm 11 and 12 is pivotally connected to a pivot pin 20 protruding from the mission case 3. Clutch operating members 21, 22, which are pivotally connected to the pin 20 and rotated around the pivot pin 20 via a linkage to the operating lever 19. is each tension arm 1
This clutch operating member 21 is arranged between the bases of L12 and
Abutment pieces 21' and 22' are connected from .degree. 22, and a locking piece 11' is connected from the tension arm 1L12.

12' is abutted and locked to swing the tension arms 11 and 12.

Further, the clutch operating member 2L22 is configured to be slidable on the pivot pin 22 and biased in a direction away from each other by a spring 23, and there is a gap between the clutch operating member 2L22 and the base of the tension arm 1L12. , a cam member 24,25 rotatably pivoted to the pivot pin 20 is provided.

Then, this cam member 24, 25 and the clutch operating member 2
The surface facing L21 is formed into an inclined cam surface, and by forcibly rotating this cam member 24.25, the clutch operating member 21.22 is connected to the tension arm 11.1.
2, and is comprised of abutting pieces 21', 22' and locking pieces 11', 12' that abut and lock each other when the tension clutches 15 and 16 are in the engaged state. The state holding mechanism 26,27 is configured to be released.

Further, the rotation of the cam members 24 and 25 is performed in conjunction with the movement of the rotary cover 6 toward the loaf IJ-apparatus B.

That is, the rotary cover 6 is provided with a protruding piece 37, and this protruding piece 37 is connected to the L-shaped swing link 29 which is pivotally supported in the rotary side mounting portion 28 which is engaged and connected to the hitch 5. are connected by a wire passing through the tilling frame 30, and a swingable link 31 pivotably supported near the hit on the side of the main body A that swings in contact with the swinging link 29 above a certain level, and the cam. A rod 32a t 32b has one end pivotally connected to the members 24 and 25, and a cross-shaped link 34, which is connected to the other end via flexible connection holes 33a and 33b and pivoted about a fulcrum P, is connected by a rod. The cam members 24 and 25 are rotated in conjunction with the constant rocking of the rotary cover 6 toward the rotary device B, and the holding mechanisms 26 and 27 are both released.

In addition, the flexible connection holes 33at33b provided in the connecting portions between the rods 32a, 32b and the link 34 are formed as the clutch operating members 21 and 22 are rotated in order to selectively operate the tension clutches 15 and 16. , the cam member 24 or 25 is rotated and the distance between the cam members 24 and 25 and the link 34 is changed, and the engagement recess 35 is provided at an appropriate location.
... are formed, and are configured to position the rods 32a, 32b in connection with the flexible connection holes 33a, 33b.

According to the above configuration, when the worker's foot or the like unexpectedly approaches the rotary device B side, the rotary cover 6 comes into contact with and swings, and the tension clutch 15° which alternatively appears in the tension state. 16 is the holding mechanism 26.2
7 is released as the rotary cover 6 swings, and the tension arms 11 and 12, which are biased toward the latch release side by springs 17 and 18, quickly swing toward the clutch release side, resulting in the clutch release state.

Then, the drive of the rotary device B is also stopped, and even if the foot or other force comes into contact with the button-tally device B, the user will not be caught in the contact and be injured.

In the embodiment, a double tension type system in which two tension clutches 11 and 12 are provided is illustrated, but it goes without saying that a system in which one tension clutch is provided may be implemented in the same manner.

In addition, in the embodiment, the engagement recess 35 formed in the flexible connection hole 33at33b between the rod 32at32b and the link 34 allows the connection positioning after absorbing the connection error between the link 34 and the cam members 24, 25. However, the rod 32a.

If you install a turnbuckle in the middle of 32b,
This engagement recess 35 becomes unnecessary.

In addition, in the double tension clutch type as in the embodiment, the double tension clutches 15 and 16 are both engaged in conjunction with the approaching rocking of the tally cover 6 to actively engage the transmission mechanism. It is also possible to force the engine E to suddenly increase the load on it, thereby stopping the engine E, but in this case, the belts 9 and 10
There is a risk that an extremely large tension will be applied to the transmission shaft or a large bending moment will be applied to the transmission shaft, deforming or damaging the parts, and there is also the disadvantage of having to start the prime mover E when starting work again. .

In summary, the safety device for a walk-behind cultivator according to the present invention is a rotary tiller main body A in which a mounted prime mover E and a transmission case 3 are interlocked and connected via tension clutches 15 and 16 that are biased towards the clutch disengagement side. A rigid rotary cover 6 is disposed at the rear of the rotary device B so as to be movable back and forth, and the tension clutches 15 and 16 are operated in conjunction with the movement of the rotary cover 6 toward the rotary device B. Holding mechanism 2 for entering state
6.27, and even if the worker's foot or other object unexpectedly moves toward the rotary device, the tension clutch is disengaged in conjunction with the approaching rocking of the rotary cover, and the drive of the rotary device is stopped. This prevents the worker's feet from coming into contact with the force button and the tally device and causing damage. In particular, the disengagement of the tension clutch is controlled by the engaged state of the tension clutch, which is biased toward the disengagement side. Since this is done by releasing the holding mechanism, the tension clutch can be quickly disengaged, and the rotary device can therefore be quickly brought to a halt.

In other words, the present invention has a simple structure in which the holding mechanism is released in conjunction with the approaching rocking of the rotary cover by effectively utilizing the structure of the tension clutch which is normally biased towards the clutch release side. However, it became possible to stop power transmission to the rotary device by quickly releasing the latch, thereby improving safety.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the safety device for a walk-behind cultivator according to the present invention, in which Fig. 1 is an overall side view of the cultivator, Fig. 2 is an explanatory diagram showing an interlocking configuration of a rotary cover and a tension clutch, Figure 3 is a plan view of the tension clutch, Figure 4
The figure is an enlarged side view of the main part. 3...Mission case, 6...Rotary cover, 15, 16...Tension clutch, 26゜27...,...Holding mechanism, E...
...Engine, B...Rotary clamping device.

Claims (1)

[Claims] 1. A rotary device B is interlocked with the tiller main body A, in which the mounted prime mover E and the transmission case 3 are interlocked and connected via the tension clutch 15, 16 which is biased toward the clutch disengagement side, and the rear of the rotary device B is A rigid rotary cover 6 is disposed so as to be movable back and forth, and the holding mechanisms 26 and 27 for holding the tension clutches 15 and 16 in the engaged state are released in conjunction with the movement of the rotary cover 6 toward the rotary device B. A safety device for walk-behind tillers.