JPH0437361Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a tiller claw used when tilling by rotating the tiller shaft in forward and reverse directions.

(b) Prior Art Conventional tilling claws for forward and reverse rotation were constructed by curving the tip of a flat plate to one side, and were provided with various stoppers to maintain the claw angle during forward and reverse rotation work.

(c) Problems to be solved by the invention If the tilling claws are made of a simple flat plate, the tips of the tilling claws are curved to one side, so when the tilling claws cut into uncultivated soil, they tend to bend, which reduces the strength of the tilling claws. In addition, since the entire convex plate surface is in contact with the uncultivated soil, contact resistance is large, and the structure is complicated when various stoppers are provided to maintain the claw angle during forward and reverse rotation. This increases weight and cost.

(d) Means for solving the problem The present invention increases the strength of the tilling claw by extruding and molding a substantially symmetrical rib in the middle part of the plate surface of the tilling claw toward the side where the plate surface is concave. At the same time, frictional resistance is reduced, and the end of the rib on the tilling shaft side is placed in contact with the holder to set the inclination angle of the tilling claw, thereby maintaining the claw angle during forward and reverse rotation work. The above-mentioned problem was solved by making it possible to also use it as a stopper.

(E) Function The left-right symmetrical ribs increase the strength of the tilling claw, which has a curved tip, to prevent deflection and reduce contact resistance when the tilling claw operates. When tilted toward the forward or reverse rotation side, it engages with the holder and acts as a stopper.

(F) Example An example of the present invention will be explained with reference to the drawings.
In the embodiment shown in FIGS. 1 to 3, the tilling claw 1 is approximately spade-shaped and has a mounting hole 2 at its base, and its tip is curved toward one side as shown in FIG. 2a. In the middle part of the plate surface, symmetrical ribs 3, 3 are extruded toward the concave side by press working.

Further, as shown in FIG. 1, the base of the tilling claw 1 is inserted between a pair of holders 5, 5 which are integral with the tilling shaft 4, and is rotatably supported by a bolt 6 and a nut 7. Although not shown, two disc springs are clamped between the holder 5 and the base of the tilling claw 1, so that even if the tilling claw 1 is subjected to centrifugal force, it will not tilt to one side or the other with respect to the rotation direction. I am learning to maintain my posture.

Furthermore, the ends of the ribs 3, 3 on the tilling shaft 4 side are
When the tiller claws 1 are set in an inclined position, they are cut diagonally so as to form an overlapping part 8 that joins to the side surface of the holder 5, as shown in FIG. It communicates with the recess.

When performing tillage work with the above-mentioned tilling claws 1, the tilling claws 1 cut into the uncultivated soil as shown in FIG. Since the tilling claws 1 are pressed toward the concave portion by the uncultivated soil and tend to bend, the ribs 3 counteract this and prevent the tilling claws from bending.

Further, the overlapping portion 8 at the end of one of the ribs 3 is joined to the side surface of the holder 5 to be received,
The tilling claws 1 can be held in a predetermined inclined posture without providing a special stopper.

Next, another embodiment will be described with reference to FIGS. 4 to 6. This tilling claw 1 has a wide rib 3a extending to the left and right of its center line and forming a substantially symmetrical shape, and a pair of left and right ribs 3b near the base. , 3b, the wide rib 3a is made to protrude from the convex side of the tilling claw 1 toward the concave side by press working, and the rib 3 on the base side
b and 3b are made to protrude in opposite directions, and by interposing and tightening a disc spring 10 between one holder 5 and the base of the tilling claw 1, the tilling claw 1 receives centrifugal force. It is also designed to maintain a tilted posture.

Furthermore, a pair of grooves 1 are provided in the upper and both sides of the holder 5 corresponding to the left and right ribs 3b, 3b, respectively.
1, 11, 12, and 12 are bored, and during reverse rotation work, the left rib 3b fits into the side groove 12 as shown in Figure 6a, and the proximal end of the rib 3b The rib 3b on the right side engages with the groove 11 on the upper right side, and when performing normal rotation work, it is as shown in b, so that it is not affected by centrifugal force. The wide ribs 3a prevent the tilling claws 1 from rotating back, and contribute to reducing the contact area of the tilling claws 1 and increasing their strength.

Furthermore, auxiliary stoppers 13, 13 for receiving the tilling claws 1 are provided at the bases of the holders 5, 5.

(G) Effect of the invention As mentioned above, in the present invention, a substantially symmetrical rib 3 is extruded in the middle part of the plate surface of the tilling claw 1 toward the side where the plate surface is concave. The area of contact with uncultivated soil is reduced, and the contact resistance can be reduced.

In addition, since the end of the rib 3 on the tilling shaft side is positioned so as to abut against the holder 5 to set the inclination angle of the tilling claw, a stopper for preventing tilting of the tilling claw 1 due to tilling resistance is omitted. Alternatively, it can be significantly simplified to reduce weight and cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Fig. 1 a is a side view showing the installed state of the tilling claw, b is a front view of the same as above, Fig. 2 a is a front view of the tilling claw, b is a side view of the above, c is a sectional view taken along line A-A of b, and Fig. 3 is a front view of the tilling claw. The figure is an action diagram, and Figures 4 to 6 show other embodiments.
Figure a is a side view of the tiller, b is a side view of the holder,
Fig. 5a is a side view of the tilling claw attached to the holder, b is a front view of the same as above, Fig. 6a is a side view showing the attitude of the tilling claw during reverse rotation work, and b is the same as above during forward rotation work. 7a is a side view of a tilling claw without ribs, FIG. 7b is a sectional view of the same, FIG. 8a is a side view of another tilling claw, and FIG. 8b is a sectional view of the same. 1... Cultivating claw, 3, 3a, 3b... Rib, 4...
...Plowing shaft, 5...Holder, 11, 12...Groove.

Claims (1)

[Scope of utility model registration request] A plate-shaped tilling claw 1 whose tip is curved to one side.
is rotatably supported on a holder 5 of a tilling shaft 4, and a substantially symmetrical rib 3 is provided at the middle part of the plate surface of the tilling claw 1.
is extruded to the side where the plate surface is concave, and the end of the rib 3 on the tilling shaft 4 side is positioned so as to come into contact with the holder 5 to set the inclination angle of the tilling claw. Tilling claws for forward and reverse rotation.