JPH0610723Y2 - Tillage claw retainer - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention is a pin used for connecting a plurality of members,
In particular, the present invention relates to a spring-loaded pin that can be easily attached to and detached from a pin hole, is reliably held, and does not cause a solidification trouble due to intrusion or adhesion of mud or the like.

(B) Conventional technology There is a support structure for a plowing pawl that inserts the holder part of the plowing pawl into the pawl holder of the plowing shaft and holds the plowing pawl on the pawl holder by the relative rotation of the plowing pawl with respect to the pawl holder during the plowing rotation. . In this case, the pins are fitted into the through holes of both. Then, these pins are provided with a retaining means. In most of them, one end of the pin is enlarged to have a head, and the other end is used as a male screw portion to protrude from the pin hole and tightened with a nut. In this case, a spring washer is used to prevent the nut from loosening, a nut with a special locking mechanism is used, or a split pin is also used.

This is a structure generally used for retaining the tilling nail, and has the following problems.

(C) Problems to be solved by the invention In many cases, the pins having the above various retaining structures are frequently attached and detached. In this case, there are problems in operation, work management, etc. in the retaining structure of various types described above. That is, the attachment / detachment of nuts is complicated and time-consuming, and tools are required each time. In addition, the small parts such as the nut are easily lost. Further, when the target mounting location is an agricultural power machine, for example, a mounting portion of a tiller claw of a cultivator to a holder, mud often enters and sticks. Therefore, unless the adhered mud is surely removed, the next operation is complicated and cannot be performed promptly.

This invention was created in view of the above-mentioned conventional problems,
The purpose of the present invention is to provide a retaining device for a plowing claw that can be attached and removed with one touch.

(D) Means for Solving the Problems In order to achieve the above object, the present invention inserts a holder part of a tilling claw into a claw holder attached to a tilling shaft, and makes the claw holder relative to the claw holder when rotating the tiller. A support structure for a tilling claw that clamps and supports a tilling claw on a claw holder by rotation. A through hole that serves as a center of relative rotation between the claw holder and the tilling claw is provided, and the through hole can be inserted and removed with one touch. And a pin body having an enlarged head at one end, the support body being axially hollow from at least the intermediate portion to the other end in the length direction of the pin body, and divided in the circumferential direction. And a spring member formed in a hollow cross-section with a split groove having an elastic force in the radial direction, and an end portion of the spring member extending near the outside of the target pin hole and elastically deformable in the radial direction. Larger diameter part and less spring member Both are configured to include a soft elastic body filled in the hollow cross section.

(E) Embodiment An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view including a partial cross section of a first embodiment of a spring-loaded pin according to the present invention, FIG. 2 is a front view taken along the line II-II of FIG. 1, and FIG. It is a figure.

In this first embodiment, the spring-loaded pin 1 as a support is provided with a spring holding collar 3 as an enlarged head at one end thereof. In the pin body 5, a spring steel sleeve 9 is fitted around the outer circumference of a mild steel round bar 7 having a short cylindrical cross section. Sleeve 9
The spring retainer collar 3 is fitted to one end (left side in FIG. 1) of which the center hole 11 at the end face and the end face of the round bar 7 are fixed by welding. The other end side (the right side in FIG. 1) of the sleeve 9 is extended to a length that slightly protrudes to the outside when fitted into a target pin hole (not shown). The hollow cross-section portion 13 thus extended is provided with four split grooves 15 in the vertical and horizontal directions.

Accordingly, the extended hollow cross-section portion 13 of the sleeve 9
Each part divided by the dividing groove 15 has a elastic force that expands and contracts in the radial direction from the axial center of the pin body 5 as a leaf spring 17 which is a spring member. Each tip of the leaf spring 17 forms a first bent portion 19 which is obliquely directed toward the outer peripheral direction at a position corresponding to the outer surface of the target pin hole (not shown), as shown in FIG. Further, a second bent portion 21 is formed at the tip thereof so as to be inclined inward.

The first bent portion 19 includes the spring-loaded pin 1 in the third position.
Through-holes L. between the claw holder H of the cultivating shaft and the holder portion S of the cultivating claw shown in FIG. It functions as a retaining part when it is inserted into M.
Then, the second bent portion 21 inserts the spring-equipped pin 1 into the through hole L.P. When inserting into the through hole L.M. It is pressed against the peripheral edge of M to reduce the intersection of the first bent portion 19 and the second bent portion 21, that is, the outer peripheral diameter enlarged portion 23. Further, when the spring-equipped pin 1 is removed from a pin hole (not shown), the outer peripheral diameter enlarged portion 23 is reduced. In this case, the held portion S is clamped and supported by the relative rotation of the pin 1 and the pin 1 with respect to the claw holder H.
The pin 1 is simply a through hole L.P. The elastic reaction force at the enlarged portion 23 is not so strong as long as it is held by M. Therefore, the tip of the second bent portion 21 is lightly hit with a hammer or the like to the left side in FIG. By this operation, the diameter of the second bent portion 21 is narrowed down, the outer peripheral diameter enlarged portion 23 is also reduced, and the through hole L. The spring-loaded pin 1 can be pulled out from M.

Next, the soft elastic body 25 is filled in the hollow cross-section shaped portion 13 in the area where the dividing groove 15 is formed. In the case of the embodiment,
The soft elastic body 25 is slightly inserted into the split groove 15 portion. In this case, the soft elastic body 25 uses a closed cell type polyurethane foam resin. Therefore, the leaf spring 1 described above
It is possible to have a property such that only a slight elastic force is applied to the seven portions, the first bent portion 19, and the radial elastic deformation in the vicinity of the second bent portion. Therefore, the leaf spring 17 portion does not interfere with other elastic deformation in the radial direction.

Further, by adjusting the physical properties of the soft elastic body 25, the elastic force urging action of the soft elastic body 25 can be strengthened, and thus the characteristics of the leaf spring 17 portion and other elastic deformation in the radial direction can be positively influenced. There is a possibility that it will be changed.

Then, by filling with the soft elastic body 25, the leaf spring 1
The entry of mud and other foreign matter into the 7th portion, the first bent portion 19, the second bent portion 21, the split groove 15, etc. is reliably prevented. As a result, it is possible to prevent the situation where the elastic deformation of the leaf spring 17 and other portions in the radial direction due to the solidification of the invading mud is hindered. Further, since the intrusion of the above-mentioned mud and other foreign matter is blocked, the leaf springs 17 accompanying the attachment of these are prevented.
Corrosion from the inner peripheral side of can be greatly suppressed.

In the second embodiment shown in FIGS. 4 and 5 below, the mild steel round bar 7 of the first embodiment has a taper shaft portion 27 continuous thereto. The taper shaft portion 27 extends to the vicinity of the other end (right end in FIG. 4) of the leaf spring 17. Further, as an enlarged head portion at one end of the spring-equipped pin 1, an enlarged portion 29 obtained by press-molding one end of the spring steel sleeve 9 is provided. In this case, the split groove 15 is arranged by dividing the circumference into three as shown in FIG. The other structure and the attaching / detaching operation of the spring-loaded pin 1 are the same as those in the first embodiment, and the description thereof will be omitted.

However, the spring-loaded pin 1 in the second embodiment has the first
As compared with the embodiment, since the tapered shaft portion 27 is extended as described above, there is an advantage that rigidity, shear strength, bending strength, etc. are improved over the entire length of the spring-loaded pin 1.

The third embodiment shown in FIGS. 6 and 7 below is a slight modification of the second embodiment. That is, mild steel round bar 7
Is slightly thinned and is provided as a right circular cylinder over substantially the entire length of the spring-equipped pin 1, and the other end corresponding to the right end in FIG. 6 is slightly chamfered. On the other hand, the vicinity of one end (left half in FIG. 6) of the spring steel sleeve 9 is made slightly thicker, and the end portion of the spring steel sleeve 9 is used as an enlarged head to form an enlarged collar portion 31.
It is molded into.

The hollow cross-section portion 13 at the other end of the spring steel sleeve 9 is made thinner than the vicinity of one end of the sleeve 9 (left half in FIG. 6). As a result, the leaf spring 17 formed by the split groove 15 obtained by dividing the hollow cross-section portion 13 of the sleeve 9 into three on the circumference is easily bent. The leaf spring 17 portion includes a first bent portion 19, a second bent portion 21, and an outer peripheral diameter enlarged portion 23 near the other end (the right end in FIG. 6), and is in a free state as shown in FIG. Then, the outer diameter is slightly enlarged for molding.

Other structures, the attachment / detachment operation of the spring-loaded pin 1, and other parts are the same as those in the first embodiment, and therefore description thereof will be omitted.
However, compared with the first embodiment, the third embodiment also has improved rigidity, bending strength, shear strength, etc. over the entire length of the spring-equipped pin 1, and the leaf spring 17 portion is enlarged, The mounting strength when mounted in a pin hole (not shown) is slightly higher.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, the soft elastic body may be made of soft rubber or the like instead of foamed resin so that the elastic force of the leaf spring 17 portion can be more strongly urged. Alternatively, it is also possible to make the leaf spring 17 portion very short and further improve the pin strength. Furthermore, both the first bent portion 19 and the second bent portion 21 can be shifted to the left side in FIG. 1 to enter the inside of the through hole. However, in this case, it goes without saying that the engaging enlarged portion is provided at a corresponding position near the end portion inside the through hole. This way,
It is possible to reduce the amount of protrusion of the other end side (the right end in FIG. 1) of the spring-loaded pin 1 to the outside.

(F) Effect of the Invention As is clear from the above description, according to the present invention, the attachment / detachment operation is easy and quick and can be performed with one touch even with a simple structure. Moreover, it can be installed securely and will not come loose or come out. Also, there is no fear of losing small parts.

[Brief description of drawings]

FIG. 1 is a side view including a partial cross section of a first embodiment of the device of the present invention, FIG. 2 is a front view taken along the line II-II of FIG. 1, and FIG. 4 is a side view including a partial cross section of the second embodiment, FIG. 5 is a front view taken along the line IV-IV of FIG. 4,
FIG. 6 is a side view including a partial cross section of the third embodiment, and FIG. 7 is a front view taken along the line VI-VI of FIG. Description of main drawing symbols 1 ... Pin (support), L.P. M: Through hole H: Claw holder, S: Holder part

Claims (1)

[Scope of utility model registration request] 1. A support structure for a plowing pawl in which a holder part of the plowing pawl is inserted into a pawl holder attached to a plowing shaft, and the plowing pawl is clamped and supported by the pawl holder by relative rotation of the plowing pawl with respect to the pawl holder when the plowing rotation is performed. A through hole that is the center of relative rotation between the claw holder and the tilling claw is provided, and a support tool that can be inserted and removed with one touch is provided in the through hole, and the support tool has an enlarged head at one end. Formed into a hollow cross-section with a pin body having a pin and a split groove that is axially hollow from at least the middle portion to the other end in the length direction of the pin body and that is divided in the circumferential direction and has elastic force in the radial direction. A spring member, an enlarged diameter portion formed by extending the end portion of the spring member to the vicinity of the outer side of the target pin hole and elastically deformable in the radial direction, and filling at least the hollow cross-section portion of the spring member. Tillage comprising a soft elastic body Retaining device.