JPH0325525Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tilling claw attachment structure that can be used in both forward and reverse directions, and is particularly designed to reliably attach the tilling claw to a flange on a claw shaft.

In a rotary tiller, there are generally two types of structures for mounting the tiller claws on the claw shaft: a flange type and a bracket type.

The flange type has a disk fixed to the outer circumference of the pawl shaft, and the bracket type has a box-shaped bracket fixed to the pawl shaft. Each has its own length and shortness, and both types are used in forward rotation rotaries. There is.

Incidentally, recently, the development of a rotary that can be used for both down-cutting and up-cutting, in which the direction of rotation of the claw shaft can be freely switched between forward and reverse directions, has been attracting attention in the industry. The mounting structure of the tiller claws in the industry is mainly a bracket type (Public Law Publication No. 47-8121, Publication No. 43-7843).
It was hot.

The reason why this flange type has not been proposed is that although there is a demand for the development of a flange-type structure for attaching the tiller claws of dual-use rotaries, the reason why this flange type has not been proposed is because the flange type normally uses one flange, This is because it was difficult to maintain both normal and reverse rotation positions, and there were also problems in terms of strength.

Therefore, the present invention aims to provide a sturdy and strong claw attachment structure even if it is a flange type.In this invention, the base end attachment part of the tilling claw has blade edges on both sides of the blade part. The claw mounting body is attached to a claw mounting body on the claw shaft via a bolt, and the claw mounting body is composed of a pair of flanges facing each other in the direction of the claw axis, and the insertion portion of the proximal end mounting portion is inserted between the flanges. is formed in the radial direction, and furthermore, a stopper for supporting the tilling claw in each of forward and reverse rotation positions is formed in the insertion portion to protrude from the flange in the direction of the claw axis.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figures 1 to 4 show the first embodiment of the present invention, in which 1 is a pawl shaft, which rotates forward (down cut direction) and reverse (up cut direction) around its axis.
It can be freely switched and rotated.

Reference numeral 2 denotes pawl attachment bodies, which are fixed in large numbers on the pawl shaft 1 at predetermined intervals in the axial direction.

The claw attachment body 2 is made up of a pair of flanges 3 and 4 that face each other in the direction of the claw axis, and in this embodiment, it is a press-formed sheet metal member having annularly formed outward protrusions 5 and 6 on the outer periphery of the flanges 3 and 4. The inner circumferential edge hole is fitted onto the pawl shaft 1 and fixed by welds 7 and 8, and two pawl insertion portions 9 are formed in the radial direction between the flanges 3 and 4 in this example.

Reference numeral 10 denotes a stopper, which is formed at the bottom of the insertion portion 9 in a U-shape in this example as shown in FIGS.

That is, the flanges 3 and 4 are formed to bulge in the direction of the nail axis opposite to the protrusions 5 and 6, and the bulge facing surface 10A
The flanges 3 and 4 are superimposed on each other and spot welded to fix the pair of flanges 3 and 4.

Reference numeral 11 denotes a pawl attachment hole, which is formed in each of the flanges 3 and 4 at the insertion portion 9 on the stopper 10.

Reference numeral 12 denotes a buffer elastic body, which is fitted onto the stopper 10 and fixed by baking or adhesive.

Reference numeral 13 denotes a tiller claw that can be used in both forward and reverse directions, and has a shape in which the root and tip of the blade portions 14 and 15 of two hatchet claws are connected to each other, and blade edge portions 16 and 17 are provided on both side edges.
A bolt insertion hole 19 is formed in the proximal end attachment part 18, and the distal end forms an inverted part 21 via a bent part 20.

The blade edge portions 16 and 17 have a curved convex shape, and in this example, both are symmetrical with respect to the center in the nail width direction, but they may be asymmetrical.

Then, the base end attachment part 18 is fitted into the insertion part 19, the bolt insertion hole 19 and the attachment hole 11 are aligned, and the bolt 22 is used to attach the proximal end attachment part 18. In this example, the protrusions 10 at both ends of the stopper 10 are
B and 10C are configured to receive the signal selectively.

That is, the tapers 23, 4 and the protrusions 10B, 10C
By responding alternately, the reaction force due to the folding of the claws is borne in the normal rotation posture and the reverse rotation posture.

In other words, when the direction of the arrow in FIG. 1 is forward rotation, the blade edge 16 is supported by the taper 23 and the protrusion 10B so that its tip is in the backward rotation direction, and it is not driven into the soil. This is prevented by the tightening force of the bolt 22, or by the tightening force and the elasticity of the flanges 3, 4, from causing the claw to reverse in the opposite direction (in the direction of the arrow) due to centrifugal force.

Therefore, when switching to reverse rotation, it is sufficient to loosen the bolt 22 and align the taper 24 with the protrusion 10C.

FIG. 5 shows a second embodiment, in which the buffer elastic body 12 of the first embodiment is omitted, and the rest is the same as the first embodiment.

FIG. 6 shows one flange 3 or 4 in the third embodiment, in which the stopper 10 is shaped continuously in the circumferential direction on the circumference centered on the pawl axis, and FIG. is the protrusion 10B, 1 in the fourth embodiment.
0C is extended radially outward, and the stoppers 10 are connected to each other at semicircular portions 10D and 10E at the outermost periphery.

FIG. 8 shows a fifth embodiment, in which a cylindrical collar 26 having a flange 25 is inserted into the bolt insertion hole 19, and an elastic force shown by a disc spring is provided between the inner surface of the flange 25 and the outer surface of the proximal attachment portion 18 of the claw. In this example, the elastic body 27 prevents the claw 13 from returning to normal rotation←→reverse rotation due to centrifugal force.This fifth embodiment is similar to the first embodiment. It can also be adopted in the ~4 embodiments. The insertion portion 9 and stopper 10 of the fifth embodiment are slightly different from those of the first embodiment, and the radially inner side is straight 10F.

FIG. 9 shows an example of use, in which a claw shaft 1 and a large number of tilling claws 1 are attached to this via flanges 3, 4, etc.
3 constitutes a tilling section R, and this tilling section R shows a rotary covered with a cover device K, and the tilling section R can be rotated between forward and reverse rotation by switching the transmission section between forward and reverse directions using a switching lever L. The direction of rotation can be switched.
Note that T indicates a rake device.

In the present invention, the base end attachment portion 18 of the tilling claw 13, which has blade edge portions 16 and 17 on both side edges of the blade portions 14 and 15, is attached to the claw attachment body 2 on the claw shaft 1 via a bolt 22. The claw attachment body 2 is composed of a pair of flanges 3 and 4 facing each other in the claw axis direction, and the insertion portion 9 of the base end attachment portion 18 is formed in the radial direction between the flanges 3 and 4. Furthermore, the insertion part 9 is characterized by a stopper 10 that supports the tilling claws 13 in each of the forward and reverse rotation positions and is formed to protrude from the flanges 3 and 4 in the direction of the claw axis. There are advantages.

Since the tilling claws 13 are fitted into the fitting portions 9 formed between the pair of flanges 3 and 4 and are attached with bolts 22, flange-type attachment can be adopted for both forward and reverse use.

When attaching these flanges 3 and 4, instead of one flanges 3 and 4, two pieces are fixed in the direction of the claw axis, so the strength is sufficient and it can be used in both hard and soft fields. Moreover, since the stopper 10 is formed by bulging in the direction of the pawl axis, the flange 3,
It also has the reinforcing rib effect of 4 and can be made even stronger, and since the stopper 10 can be formed by press working, it is possible to reduce manufacturing costs.

[Brief explanation of the drawing]

The drawings show examples of the present invention, and Figures 1 to 4 are the first embodiment.
Embodiment FIG. 1 is a front view, FIG. 2 is a cross-sectional view, and FIG. 3 is an arrow view of FIG. Figure 4 is the third
Figure 5 is a front view of the second embodiment; Figure 6 is a front view of the second embodiment;
The figure is a front view of the third embodiment with the claw omitted, FIG. 7 is a front view of the fourth embodiment, FIG. 8 is a sectional view of the fifth embodiment, and FIG. 9 is a side drive type rotary as an example of use. It is a side view of a tilling device. DESCRIPTION OF SYMBOLS 1... Claw shaft, 2... Claw mounting body, 3, 4... Flange, 9... Fitting part, 10... Stopper, 13... Tilling claw, 22... Bolt.

Claims (1)

[Claims for Utility Model Registration] Blade edge portions 16 and 1 are provided on both side edges of the blade portions 14 and 15.
7 is attached to the claw mounting body 2 on the claw shaft 1 via a bolt 22, and the claw mounting body 2 has a pair of claw mounting members 2 facing each other in the direction of the claw shaft. It consists of flanges 3 and 4, and an insertion part 9 of the base end attachment part 18 is formed in the radial direction between the flanges 3 and 4. Furthermore, the insertion part 9 has a tiller claw 13 that can be rotated in forward and reverse directions. A tilling claw mounting structure capable of being used in both forward and reverse directions, characterized in that a stopper 10 that is supported in a posture is formed to bulge out from flanges 3 and 4 in the direction of the claw axis.