JPS6016242Y2 - Safety device for tillage equipment that can be moved left and right - Google Patents

Description

[Detailed description of the invention] This invention is a tilling device that is connected to the rear of a tractor using a three-point link system and is movable from side to side. The present invention relates to a safety device for a tilling device that can be moved left and right, in which the operation lever for movement can be effectively operated only in an unloaded state.

Recently, in order to carry out safe and efficient tillage work, tillage devices that can move the tiller in parallel from side to side without disturbing its power transmission structure or the like have been seen.

However, if this movement of the tilling device from side to side is carried out while the tilling device is in contact with the ground and plowing, the thrust load will be too large due to soil resistance etc., causing strain on various parts and causing malfunctions. .

Therefore, the tiller is operated only when it is off the ground and under no load, but due to erroneous operation or because no special control structure has been added to the operating lever that is supposed to move left and right. 'Often, the equipment was moved from side to side during plowing work, causing damage to the equipment.

Therefore, this invention aims to eliminate the above-mentioned drawbacks by organically interlocking the raising/lowering lever on the tractor side that raises and lowers the tilling device and the operating lever for left and right movement.

Hereinafter, specific embodiments of this invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional plan view of this tilling device.
The overall structure is as follows.

The side plates 1 and 1' on both sides are connected and fixed by the main beam 2, and the main beam 2 has a gearbox 3 at its center.
A sub-gear box 4 is formed adjacent to one of the two.

Outer cylinder 5 from gearbox 3 or sub gearbox 4
, 5' are arranged in series, while the outer ends are fixed to the side parts 1, 1', and the inner cylinders 6, 6' are slidably fitted into the outer cylinders 5, 5'.

Further, since the side plates 1.1' are integrated by the sub-beam 7, the entire cultivating device 8 has a structure in which the inner tubes 6, 6' slide with respect to the outer tube 5.degree. 5' and move from side to side.

Next, the power is transmitted through the main beam 2 to one side plate 1.
The power of the PTO shaft of the tractor is transmitted in the gearbox 4 to the sidewardly extending transmission shaft 9 by means of a pair of bevel gears 10,10'.

The power is then finally transmitted to the tilling shaft 12 by a gear and chain 11 at the end of the transmission shaft 9.

The transmission shaft 9 is connected to a spline cylinder 13 midway so that its length can be changed.

There are two types of mechanisms for moving left and right: mechanical and hydraulic, and the mechanical type is configured as follows.

A female screw 14 whose end is fixed to one side plate 1' is built into the main beam 2, and the other end of a screw shaft 15 screwed into this open end is pivotally supported on the outer cylinder 5' side.

By rotating the screw shaft 15 in the forward or reverse direction, the tilling device 8 moves integrally to the left or right.

Therefore, a pair of bevel gears 16 and 16' that are loosely fitted onto the screw shaft 15 and rotate in opposite directions are provided, and a slide clutch 17 that slides in the axial direction while transmitting the rotational force of the screw shaft 15 between them.
will be established.

Then, by engaging the engaging bodies 18.18' formed on both sides of the slide clutch 17 with the engaging bodies 19.19' formed on the inside of the bevel gear 16.16', the screw shaft 15 is Rotate left or right.

Therefore, operating the slide clutch 17 to the left or right moves the tilling device 8 to the left or right, and this is done by the operating lever 20.

FIG. 2 is a longitudinal cross-sectional view of the operating lever 20. The operating lever 20 is fixed to a chamber shaft 21, and an arm 22 extends from the chamber shaft.
is extended horizontally, and a shoe 23 is fixed to the tip of the arm 22. This shoe 23 is fitted into a groove 24 formed in the slide clutch 17, and the operating lever 20 is rotated around the chamber axis 21. By moving, slide clutch 1
7 is the left bevel gear 16 or the right bevel gear 1
6'.

By the way, in this invention, the operation of this operating lever 20 is
The tiller 8 is organically interlocked with a lift lever 25 provided on the tractor side so that it can be assumed that the tiller 8 is being lifted away from the ground.

FIG. 3 is a side view of a tilling device connected to the rear of the tractor in a three-point hook system.

That is, the tilling device 8 is connected by an upper link 26 and a lower link 27.27 of the tractor, and a lifting blonde 28.28 is connected to the lower link 27.27, and this lifting blonde 28.28 is connected to a hydraulic cylinder. Rotating link 3 that rotates to move up and down by 29
Connected to 0.

A pipe 33 extends between the positive pressure chamber 31 and the back pressure chamber 32 of the hydraulic cylinder 29 and is connected to a directional switching valve 34 .

The spool 35 of the directional control valve 34 and the lifting lever 25 are connected.

Therefore, when the elevator lever 25 is now set from the opening to the A side in FIG. Lifting Blonde 28.28 will be increased accordingly.

At this time, since the operation lever 20 can be operated, the lock body 36, which can be freely engaged and detached and acts on the operation lever 20, should be in the "disengaged" state.

As shown in the perspective view of FIG. 4, the structure of the lock body 36 is a plate body that is rotatable around a support shaft 37, and a recess 39 is provided in the center of the upper upright piece 38. On the other hand, a wire 41 is connected to the lower hanging piece 40, and the other end of this wire 41 is tied to the lifting lever 25.

Then, the lock body 36 rotates clockwise and the recess 39
A state in which the operating lever 20 is inserted into the inner part is defined as an "engaged" state, and a state in which the recess 39 is removed from the operating lever 20 by rotating counterclockwise is defined as a "disengaged" state.

Therefore, by setting the lifting lever 25 from the opening to the position A in FIG.
Coupled with the fact that a spring 43 is interposed between the fixing pieces 42 that fix the lock body 36, the expansion force of the spring 43 causes the lock body 36 to rotate counterclockwise, and the operating lever 20 is placed in the above-mentioned "disengaged" state. shall be.

In this state, the tilling device 8 can be moved to the left or right by rotating the operating lever 20 to the left or right.

Next, as shown in the side view of FIG. 5, by setting the elevator lever 25 from A to the opening position, the directional control valve 34 is switched and pressure oil now flows into the back pressure chamber 32 of the hydraulic cylinder 29. Then, the rotating link 30 is rotated clockwise to lower the lifting blonde 28.28.

When the lifting blondes 2B and 28 descend, the cultivating device 8 comes into contact with the ground, but at this time the wire 41 is pulled and the lock body 36 is rotated clockwise so that the recess 39 fits into the operating lever 20. , locks the operating lever 20.

As described above, in the tilling device 8 which is connected to the rear of the tractor by a three-point link system and is movable from side to side, the locking body 36 which can be freely engaged and disengaged acts on the operation lever 20 which moves the tilling device 8 from side to side. When the lift lever 25 is operated to raise the lifting rod 28.28 of the tractor, the lock body 36 is in the "disengaged" state, and when the lift lever 25 is operated to lower the lifting rod 28.28, the lock body 36 is also in the "engaged" state. lift lever 2 so that it is in
A safety device for a tilling device 8 which is movable from side to side is provided by interlocking the engagement and disengagement of the locking body 5 and the locking body 36.

Therefore, first of all, since the tilling device 8 can be moved from side to side only when the tilling device 8 is raised, malfunctions and destruction of the equipment can be prevented.

Also, from the perspective of the worker, this means that the tilling device 8
(When the operating lever 20 can be operated, the tilling device 8 is raised.)
, you can work with peace of mind and there is no need to worry about malfunctions.

Furthermore, excellent effects such as being able to provide a reliable safety device by adding simple members as in this invention can be expected.

[Brief explanation of the drawing]

The drawings show a specific example of this invention; Fig. 1 is a sectional plan view of the tilling device, Fig. 2 is a sectional view showing the operating lever, Fig. 3 is a side view when the tilling device is raised, and Fig. 4 is a sectional view of the tilling device. The figure is a perspective view when the lock body acts on the operating lever, and FIG. 5 is a side view when the tilling device is lowered. Code, 8... Cultivating device, 20... Operating lever, 25... Lifting lever, 28...
・Lifting rod, 36...Lock body.

Claims (1)

[Scope of utility model registration request] In a tilling device that is connected to the rear of a tractor by a three-point link system and is movable from side to side, a lock body is actuated in a detachable manner on an operating lever that moves the tilling device left and right,
When the lifting lever is operated to raise the lifting blonde of the tractor, this lock body is in the "disengaged" state, and when the lifting lever is operated to lower the lifting blonde, the locking body is also in the "engaged" state. A safety device for a tiller that can be moved left and right by linking the engagement and disengagement of the body.