JPH0449845Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention has a bracket installed on the tilling shaft.
The tiller claws can be easily attached and removed, and the strength of the stress concentration area due to the work reaction force of the tiller claws has been improved.
This invention relates to a tilling claw attachment device that improves the durability of the tilling claw.

[Conventional technology]

Conventionally, a tilling claw attachment device is disclosed in Japanese Utility Model Application Publication No. 56-187907, which has a retaining pin that inserts the attachment base of the tillage claw into a bracket provided on the tillage shaft and penetrates through the bracket and the attachment base to prevent both from falling out. Disclosed in the official gazette. This prior art is
The mounting base is a so-called self-locking type that allows for quick and easy attachment and detachment of the mounting base to the bracket.
For this purpose, both ends of the mounting base in the width direction are wedge-shaped, or the cross section is H-shaped or drum-shaped.

[Problem that the invention attempts to solve]

As in the above-mentioned prior art, by making the shape of the mounting base wedge-shaped, H-shaped, drum-shaped, etc., stress concentration on the mounting base during work can be dispersed, and the operation of attaching and detaching the tiller claws is made easier. It gets easier, but
There was a problem that the strength near the end of the bracket at the mounting base was not sufficient. That is, as shown in FIG. 1, the mounting base 4 of the tilling claw 3 is inserted into the bracket 2 provided on the tilling shaft 1, and the mounting base 4 is inserted into the bracket 2 by passing through the bracket 2 and the mounting base 4. Remove the tilling shaft 1 with the retaining pin 5 inserted so that it does not come out.
When performing tillage work by rotating the tiller, the inner stress that appears inside the tiller claw 3 due to the action and reaction force acting on the tiller claw 3 is photographed using X-ray interference fringes as shown in A and B. It can be seen that the stress in the interference fringes is strong at the concentrically expanding center portion, and is concentrated at both widthwise end edges of the tilling claws 3 near the boundary with the outer end of the bracket 2. In fact, more than 90% of breakages and damage to tiller claws occur in this area during work.

[Means to solve the problem]

The present invention was developed to solve the above problems, and includes a mounting base of the tilling claw that is inserted into a bracket provided on the tilling shaft, and a retaining pin that penetrates through the bracket and the mounting base to prevent both from falling out. In the tilling claw attachment device, a fitting recess with a V-shaped cross section that fits into each other along the length direction is formed on the side surface of the bracket and the attachment base, and the above-mentioned groove is formed in the middle of the fitting recess. It is characterized by providing a pin insertion hole through which a retaining pin is inserted, and forming an inclined portion that gradually becomes narrower toward the bracket end from the pin insertion hole in the fitting recess near the end of the bracket. .

[Effect]

With the above structure, the tiller claw attachment device of the present invention can extremely easily attach and detach the tiller claws while fully maintaining the self-locking function, maintain sufficient strength of the tiller claws, and prevent breakage and damage due to natural loads. Improve the durability of the tiller by reducing the amount.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a tilling shaft, and a bracket 2 is fixed to the tilling shaft 1 in the radial direction.A mounting base 4 of a tilling claw 3 is inserted into this bracket 2, and the bracket 2 and the mounting base A retaining pin 5 is inserted through the mounting base 4 to prevent the attachment base 4 from being withdrawn. Further, as shown in FIGS. 2 to 4, along the length direction of the bracket 2 and the mounting base 4, the cross section is V on both ventral surfaces of each.
Shape fitting recesses 6 and 7 are formed so that they can be fitted into each other and detached from each other. When the fitting recesses 6 and 7 are fitted into each other, the left and right edges 4a, 4a of the mounting base 4 and the inner edges 2a, 2 of the bracket 2
Gaps 8, 8 are provided between the left and right edges 4a of the mounting base 4, and the size of the gaps 8, 8 is such that even when a load is applied to the tilling claws 3 when performing tilling work, the right and left edges 4a of the mounting base 4, 4a is the inner edge 2 of the bracket 2
The size is such that it does not touch a and 2a. As shown in FIG. 3, insertion holes 9 and 10 for inserting and removing the retaining pin 5 are bored at approximately intermediate positions in the length direction of the fitting recesses 6 and 7, and on one side of the bracket 2. A head fitting hole 11 into which the head 5a of the retaining pin 5 fits is provided. Further, inclined portions 6a, 7a are formed in the fitting recesses 6, 7 closer to the ends of the bracket 2 than the insertion holes 9, 10, the width becoming gradually narrower toward the ends of the bracket.
As a result, both end edges in the width direction of the mounting base 4 corresponding to the X-ray interference fringes A and B are formed thicker so as to be able to withstand stress sufficiently. On the other hand, as shown in FIGS. 5 and 6, a ring groove 12 is formed at the tip of the retaining pin 5, and a ring spring 13 is fitted into the ring groove 12. This ring spring 13 is
When the retaining pin 5 is inserted into the insertion holes 9 and 10, it acts to prevent the retaining pin 5 from coming out.
When it is not removed from the insertion holes 9, 10,
10, the pin 5 is elastically deformed and contracted in the axial direction of the pin 5, and passes through the insertion holes 9 and 10.
In order to facilitate elastic deformation of the ring spring 13, the edges of the insertion holes 9 and 10 are chamfered. In the tilling claw attachment device having such a configuration, when attaching the tilling claw 3 to the bracket 2,
Insert the mounting base 4 into the bracket 2 so that the respective fitting recesses 6 and 7 fit together, and then
When a and 7a are fitted, the insertion holes 9 and 10 almost match. In this state, the tip end of the retaining pin 5 is inserted from the head insertion hole 11 side, but at this time, the ring spring 13 hits the outer periphery of the insertion holes 9 and 10, and a strong impact is applied from the head 5a side. When applied, the ring spring 13 passes through the insertion holes 9 and 10 while being elastically deformed to contract in diameter in the axial direction of the pin 5, passes through the bracket 2 and the mounting base 4, and the ring spring 13
3 elastically returns to its original position on the outside of the bracket 2 and does not easily come out of the insertion holes 9 and 10. When tilling work is performed by rotating the tilling shaft 1 in the direction of the arrow with the tilling claw 3 attached to the bracket 2,
The tilling claws 3 are driven into the soil and the reaction force from the tilling action causes the tilling claws 3 to receive a force in the opposite direction to the rotational direction of the tilling shaft 1 around the retaining pin 5, and the outer surface of the mounting base 4 and the bracket 2 The inner surface of each fitting 6,
7 is diagonally shifted and makes surface contact, and the mounting base 4
It is locked in a state where it receives the force applied to it in a distributed manner and continues tilling work. As a result, the partially concentrated load on the mounting base 4 is dispersed, and the strength of the mounting base 4 is improved. In particular, in the present invention, the mounting base 4 has an inclined portion 7.
A is formed, so the thickness of both end portions corresponding to the A and B portions where the inner stress acts most strongly is formed, and the inner stress is resistant to stress.
Sufficient strength can be obtained, and breakage and damage to the tilling claws 3 can be prevented. When removing the tilling claws 3 from the bracket 2,
Applying an impact from the peak side of the tilling claws 3 to the fitting recesses 6 and 7
Release the mating state of the retaining pin 5,
When a strong force is applied from the side in the direction of pulling out, the ring spring 13 is elastically deformed and passes through the insertion holes 9, 10 in a reduced diameter state, and the retaining pin 5 is pulled out.
By pulling out the mounting base 4 from the bracket 2, the tilling claws 3 are removed. Therefore, its removal,
In addition, installation is easy and can be done in a short time.

[Effect of the idea]

As explained above, according to the tilling claw attachment device of the present invention, the following effects can be achieved. V-shaped fitting recesses are provided on the longitudinal sides of the mounting base of the bracket and the tilling claws, so that the fitting recesses come into contact over a wide area due to the tilling reaction force of the tilling claws, and the load can be applied in a locked state. In particular, the strength of the mounting base can be improved. Moreover, since we have formed an inclined part from the pin insertion hole of the fitting recess to the part near the end of the bracket, which gradually becomes narrower toward the end of the bracket, the strength of the inner stress part of the tilling claw is improved, and this part is prevented from breaking. Damage can be prevented and the durability of the tiller claws can be improved. Since the insertion hole through which the retaining pin is inserted is provided in the middle of the fitting recess, usability is improved when an elastically deformable member such as a ring spring is used as the retaining pin.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing an embodiment of the present invention with the mounting base of the tilling claw attached to a bracket, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is 1, FIG. 4 is a sectional view taken along the line - in FIG. 1, FIG. 5 is a side view of the retaining pin, and FIG. 6 is a plan view of the ring spring. 1... Tilling shaft, 2... Bracket, 2a... Inner edge, 3... Tilling claw, 4... Mounting base, 4a
...Side edge, 5...Pin, 5a...Head, 6,7
... Fitting recess, 6a, 7a... Inclined part, 8... Gap, 9, 10... Insertion hole, 11... Head insertion hole,
12...Ring groove, 13...Ring spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A tilling claw mounting device that inserts the mounting base of the tilling claw into a bracket provided on the tilling shaft and has a retaining pin that penetrates through the bracket and the mounting base to prevent both from falling out, the above-mentioned bracket and a fitting recess with a V-shaped cross section that fits into each other along the length direction is formed on the side surface of the mounting base, and a pin insertion part for inserting the retaining pin in the middle of the fitting recess. A tilling claw attachment device characterized in that a hole is provided, and an inclined portion is formed in a fitting recess near the end of the bracket from the pin insertion hole, the width becoming gradually narrower toward the end of the bracket.