JPH0117126Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a tilling claw that can be used in both forward and reverse directions.

Conventionally, tilling claws with vertical blades on both front and rear sides of the rotation direction are attached to a holder fixed to the rotating shaft (claw shaft) of a rotary tiller so that they can swing in the rotational direction. The configuration is provided.

Conventional tillage claws of this type employ a mounting method that limits the range of swing of the claw by bringing the outer periphery of the claw into contact with the base of the holder so that the driving angle is appropriate during forward and reverse operations. It can be seen. However, with this mounting method, the outer periphery of the pawl collides with the base of the holder when the pawl swings, causing deformation and wear of the pawl.In addition, the wear of the pawl contact portion of the holder gradually increases, causing a change in the driving angle. If the driving angle changes, the nail shaft itself needs to be replaced. In addition, the base of the holder tends to become clogged with mud, and due to this mud clogging, the claws cannot swing or swing at a sufficient angle, which has a negative effect on tillage performance.

The present invention has been developed based on the above-mentioned circumstances, and is designed so that tilling claws having vertical blade portions on both front and rear sides in the rotational direction are attached to a holder fixed to the rotational shaft of a rotary tiller so as to be swingable in the rotational direction. In the tilling claw for both forward and reverse rotation, an opening is provided in the tilling claw, and a stopper is detachably attached to the holder while passing through the opening, so that the stopper is inserted into the opening during forward or reverse rotation. This is intended to solve the above-mentioned drawbacks of the prior art by arranging the blades to be held at appropriate driving angles by contacting the peripheral edges.

The structure of the present invention will be described with reference to an embodiment shown in the drawings. Reference numeral 1 denotes an agricultural tractor, and a rotary tiller 2 that can rotate in both forward and reverse directions is attached to the rear of the tractor.

Reference numeral 3 denotes a tilling claw that can be used in both forward and reverse directions and has vertical blade portions 3a, 3a on both sides of the rotation direction.
is provided with an opening A. This opening A is located near the proximal end of the claw 3 by a fulcrum bolt 6, which will be described later.
It has a semi-circular inwardly bulging part 3' centered at , and the left and right sides of the inwardly bulging part 3' are connected to the stopper bolt 1 to be described later.
1 is a fitting part 3''. 4 is a holder fixed to the rotating shaft 5 of the rotary tilling device 2, and as shown in FIG.
A, and a right plate 4b, which is a combination of two plates, provided opposite to the left plate 4a, and the tilling claw 3 is sandwiched between the left plate 4a and the right plate 4b, and the tiller bolt 6 and the washer. 7 and a nut 8. The spring force of the two disc springs 9, 9 fitted into the bolt hole 4'a of the left plate 4a acts on the pawl 3 via the collar 10 to provide an appropriate frictional force. The pawl 3 is designed to be able to swing back and forth in the rotational direction about the fulcrum bolt 6.

Reference numeral 11 denotes a stopper, and this stopper 11 is detachably attached to the holder 4 while passing through the opening A of the claw 3. During forward tilling or reverse tilling, the stopper 11 closes in the claw opening as shown in FIG. They abut against the inner peripheral edge of portion A and are held at appropriate driving angles. The one shown is stopper bolt 1
A slightly longer collar 13 is loosely fitted onto the shaft of the nut 14 and attached to the holder 4 with a nut 14 and a washer 15 to form a stopper 11. Even when the nut 14 is tightened, the collar 13 prevents the nut 14
The clamping force is not applied to the holder 4, so the claw 3
is not clamped and fixed between the left and right plates 4a and 4b, and the claw 3 is tightened with an appropriate pressure only by the spring force of the disc springs 9, so it does not swing around unnecessarily. It is now fixed so that it does not move (swing).

The present invention is constructed as described above, and during forward tilling (rotating in the direction of arrow A in Fig. 1), the tilling claws 3 take a position as shown by the solid line in Fig. 2 due to the reaction force, and during reverse tilling ( When rotating in the direction of arrow B in FIG. 1, it swings in the direction of rotation about the fulcrum bolt 6 so that it assumes the posture as shown by the imaginary line in FIG. Since it functions as a stopper, the claws 3 are maintained at an appropriate driving angle during both forward and reverse tillage.

By the way, when the claw 3 swings, the opening A
The inwardly bulging part 3' provided near the base end of the claw rotates along the collar 13 loosely fitted to the stopper bolt 12, and the fitting part 3'' is fitted to the stopper bolt 12 at the end of rotation. Since it is positioned in this state, the swing action is performed smoothly and the impact between the stopper bolt 12 and the pawl 3 when the pawl swings is reduced as much as possible.

As described above, the present invention provides a tilling claw for both forward and reverse use, in which a tilling claw having vertical blade portions on both front and rear sides in the rotational direction is attached to a holder fixed to the rotating shaft of a rotary tiller so as to be able to swing in the rotational direction. In addition to providing an opening in the tilling claw, a stopper is detachably attached to the holder while penetrating through the opening, and the stopper comes into contact with the inner periphery of the opening during forward or reverse tillage to ensure proper driving. Since it is configured to be held at an angle, it has the following effects.

(1) Since the stopper structure does not have a stopper structure in which the outer circumferential edge of the claw comes into contact with the base of the holder like the conventional ones, it is possible to eliminate changes in the driving angle of the claw due to wear of the outer circumferential edge of the claw or the holder.

(2) If the stopper becomes worn, it is sufficient to replace only the stopper, and there is no need to replace the rotating shaft.

(3) Even if mud adheres to the opening and hardens, when the claw swings, the stopper acts as a scraper to remove the mud, so the stuck mud may make the claw unable to swing or swing at a sufficient angle. The correct driving angle can always be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side view of a rotary tiller mounted on a tractor, Fig. 2 is a side view showing the tilling claw in a swinging state, and Fig. 3 is a partially cutaway vertical sectional view showing the attachment structure of the tilling claw to the holder. FIG. 4 is a perspective view showing the structure of the left plate and right plate constituting the holder. In the figure, 2 is a rotary tiller, 3 is a forward and reverse tiller, 3a and 3b are vertical blades, 4 is a holder, 5 is a rotating shaft, 11 is a stopper, and A is an opening.

Claims (1)

[Scope of utility model registration request] A tilling claw for both forward and reverse use, in which a tilling claw having vertical blade portions on both front and rear sides of the rotation direction is attached to a holder fixed to a rotating shaft of a rotary tillage device so as to be swingable in the rotational direction, an opening is provided in the tilling claw. In addition, a stopper is detachably attached to the holder so as to pass through the opening, and the stopper is configured to abut against the inner peripheral edge of the opening and be held at an appropriate driving angle during forward or reverse tillage. This is a tilling claw that can be used in both forward and reverse directions.