JPH0449844Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention can support the tiller claws without the need for complicated fasteners such as bolts and nuts, and can be easily attached and detached. This invention relates to a support structure for the tiller claws.

(b) Conventional technology The tilling claw of a tiller is constructed by fitting the holder portion of the base of the tilling claw into each holder hole of a large number of cylindrical claw holders protrudingly fixed to the outer peripheral surface of the tilling shaft by welding. can be installed. Then, the tilling claws are attached, detached, and replaced as necessary. In this case, bolts, nuts, pins, etc. are used to fasten the claw holder and the held part. Further, the cross-sectional shapes of the holder hole and the holder portion fitted therein are often rectangular, which is easy to manufacture. However, due to the presence of clearance for smooth attachment and detachment, some wobbling is likely to occur.

As a support structure that prevents the above-mentioned rattling and also allows one-touch attachment and detachment, those shown in FIGS. 13 and 14 are also often used. That is, the tilling shaft 10
There are several other pieces on the outer peripheral surface of 1 (only one piece is shown in the drawing,
A claw holder 103 (other parts omitted) is provided in a protruding manner.
Plowing claw 1 is inserted into the holder hole 105 of the claw holder 103.
The holder 109 which is the base of 07 is fitted.
A pin hole 111 passing through both of them is provided on the side surface of the claw holder 103, a headed retaining pin 113 is inserted into the pin hole 111, and a split pin 115 is fitted to prevent the retaining pin 113 from coming off.

The inner surface of the holder hole 105 is provided with left and right inclined surfaces 11 such that the distance between the left and right side walls gradually decreases as one goes up and down in FIG. 14 from the pin hole 111 as a border.
Contains 7,119. The claw holder 103 is flat in the vertical direction of the figure, and has an octagonal cross section with opposing sides parallel to each other, and the outer peripheral surface of the claw holder 103 also has a similar octagonal cross section.

The holder portion 109 fitted into the holder hole 105 also has an octagonal cross-sectional shape similar to the octagonal shape, and is slightly smaller. Furthermore, inclined surfaces 121 and 123 that accurately abut a portion of the inclined surfaces 117 and 119 are vertically separated and provided on the left and right side surfaces. In this state, the holder portion 109 is fitted into the holder hole 105, and both are locked with the stop pin 113.

As described above, during the tilling operation, the claw holder 103 and the tilling claw 107 rotate relative to each other, for example, in the clockwise direction about the stop pin 103 due to the reaction force when the tilling claw 107 tills the soil. Now, in FIG.
and the oblique lower right portion 127, the respective inclined surfaces slide into contact with each other. A so-called wedge effect occurs, and the claw holder 10 is
3, the tilling claws 107 are firmly clamped or supported. This will cause no wobbling at all.

Note that the above-mentioned operation allows the retaining pin 113 to be omitted. However, when the held portion 109 becomes neutral with respect to the holder hole 105, the tilling claws 107 may fall off.
Therefore, using the locking pin 113 can lock the two more reliably.

(c) Problems to be solved by the invention Both of the above-mentioned conventional tiller claw support structures have problems. In other words, the former case in which the holder hole and the holder part have a rectangular cross section is likely to cause wobbling due to the presence of a clearance between the two members. However, if the clearance is reduced too much in an attempt to limit this looseness, smooth attachment and detachment will become difficult. In addition, it is necessary to improve processing accuracy, which makes manufacturing difficult.

On the other hand, even in the latter support structure having an inclined surface that exerts a wedge effect, there is a problem in that the four inclined surfaces must be precisely machined.
If the machining error exceeds the allowable limit, the desired supporting force may not be obtained or wobbling may occur. Further, the attachment and detachment must be performed in a neutral state, which is a very complicated operation.

This idea was devised in view of the above-mentioned conventional problems. It does not require troublesome fastening members such as bolts and nuts, is relatively easy to process, can be firmly and securely supported, and can be easily attached and detached. The purpose of the present invention is to provide a support structure for tilling claws that is easy to perform.

(d) Means for Solving the Problems In order to achieve the above object, this invention has a holder hole provided in which the holder part of the tiller claw is removably and pivotably fitted. A claw holder protruding from the tilling shaft, and a fixing part provided in the holder hole to fix the claw holder and the holder by elastic deformation reaction force due to relative rotation between the two. A support structure for the tilling claw is provided with a guide mechanism for attaching and removing the tilling claw by a combined engagement of a convex portion and a recess provided on the holder hole side and the held portion side.

(e) Embodiment An embodiment of this invention will be described below based on the drawings.

Fig. 1 is a perspective view of a main part of an embodiment of this invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 is a - of Fig. 2.
4 is a sectional view taken along the - line in FIG. 2, FIG. 5 is a sectional view taken along the - line in FIG. 2, and FIG. 6 is a sectional view taken along the - line in FIG. 2. , FIG. 7 to FIG. 12 are sectional views of various other embodiments at positions corresponding to FIG. 3 above. In addition, in these drawings, one of the many combinations of claw holders and tilling claws is shown.
Only groups are shown.

A large number of claw holders 3 are welded and fixed radially to the outer peripheral surface of the tilling shaft 1 at appropriate intervals. The claw holder 3 has a rectangular cross section on its outer periphery. Inner circumference,
That is, as shown in FIGS. 3 to 6, the holder hole 5 has a cross-sectional shape that is bent into a dogleg shape with a shallow angle at the center in the height direction. Specifically, the upper and lower surfaces 7 and 9 are horizontal surfaces, and the left and right side surfaces are doglegged, and each opposing surface is surrounded by parallel inclined surfaces 11 and 13. These inclined surfaces 11 and 13 function as fixing parts for tilling claws.

A held portion 17 at the base of the tilling claw 15 is removably and pivotably fitted into the holder hole 5. As shown in FIGS. 3 to 6, this holder portion 17 is formed into a vertically long rectangular cross section with chamfered corners. A pin hole 19 is provided in the center of the side surface of the claw holder 3 and passes through the pin hole 19 including the held portion 17, into which a headed stop pin 21 is inserted. Split pin 23 to prevent the retaining pin 21 from coming off.
is installed.

Next, as shown in FIG. 3, a convex portion 27 in the shape of a partially cut out sphere is provided at the center of one side edge 25 of the entrance portion of the holder hole 5. A recess 29 is provided at the position where the convex portion 27 contacts the side surface of the holder portion 17 fitted in the holder hole 5, that is, at the center of the side surface. In this case, the recess 29 has a groove shape with an arcuate cross section along the depth direction of the holder hole 5,
Its length is equal to the depth of fitting into the holder hole 5. Further, at the position where the holder part 17 has been properly fitted, the width is increased near the end of the groove corresponding to the convex part 27. This is claw holder 3 and tiller claw 15, which will be described later.
This is to ensure that there is no hindrance to relative rotation with. The convex portion 27 and the concave portion 29 constitute a guide mechanism for attaching and detaching the tilling claw.

Next, the operation of the tilling claw support structure configured as described above will be described.

When the tiller is operated, the tiller shaft 1 is rotated counterclockwise as shown by the solid arrow line A in FIG.
This causes the tilling reaction force to be applied to the tilling claws 15, and the tilling claws 15 move to the second position with the stop pin 21 as the axis relative to the claw holder 3.
Relative rotation is made in the clockwise direction as shown by the solid arrow line B in the figure. As a result, near the entrance of the holder hole 5, the holder portion 17 descends downward in the figure as shown in FIG.

Therefore, the lower left corner portion 31 and the right side middle portion 33 of the holder portion 17 are in strong contact with the inclined surfaces 11 and 13 of the holder hole 5, causing elastic deformation of the holder portion 17 and rotating counterclockwise as shown in the figure. Twisted slightly in the direction. With this, it is natural that the elastic deformation reaction force is applied to each inclined surface 1 at the point where the two points 31 and 33 are in contact with each other.
1 and 13, the holder portion 17 is strongly clamped and fixed. In this case, the elastic deformation of the held portion 17 is mainly caused by twisting due to the torsional moment caused by sliding contact with the inclined surface, but some bending is also added.

In the vicinity of the stop pin 21 of the holder hole 5, as shown in FIG. 5, the held portion 17 is held in a neutral state, that is, in a substantially vertical position. Then, near the innermost part of the holder hole 5, the held portion 17 moves upward in the figure as shown in FIG. As a result, the upper left corner portion 35 and the right side intermediate portion 37 of the holder portion are in strong contact with the inclined surfaces 11 and 13 of the holder hole 5. As a result, the held portion 17 undergoes elastic deformation in the direction opposite to that shown in FIG. 4, and is slightly twisted clockwise as shown. The reaction force is applied to the inclined surfaces 11 and 13 in contact with the two points 35 and 37, and the held portion 17 is strongly clamped and fixed. In this case as well, it is an elastic deformation in which bending is added to the twist.

Incidentally, during the elastic deformation shown in FIGS. 4 and 6 described above, the opposing corners of the abutting portions 31 and 35 at the left corner in each figure are made not to contact the inclined surface 11. For this reason, local cut-off portions 39, so-called escape portions, are provided at each of the opposing corners.

As described above, the fixed support of the claw holder 3 and the tilling claws 15 is performed using elastic deformation reaction forces near the top and bottom of the holder hole 5, so that they are supported extremely strongly and reliably. Further, machining is much easier than the conventional ones shown in FIGS. 7 and 8. This is because the inclined surface is only on the claw holder side.
In addition, since the elastic deformation action is applied, the machining accuracy may be slightly lower.

In addition to the above, there is an advantage that the tiller claws can be attached, detached, and replaced extremely easily and quickly. This is holder hole 5
A convex portion 27 and a concave portion 2 are provided at the entrance of the holder and the holder portion 17.
This is because the guide mechanism for attaching and detaching the tilling claws is provided with a combination of 9. That is, essentially no large clearance is provided between the holder hole 5 and the held portion 17. Furthermore, in this case, the holder hole 5
There are inclined surfaces 11, 13 on the sides. Therefore, the fifth
The range of hollow positions as shown in the figure is very narrow.

Therefore, if the tilling claws 15 deviate even slightly from the neutral position during attachment and detachment, the holder portion 17 will move against the inclined surface 11.
or 13 to prevent smooth attachment and detachment. Since such a situation can be eliminated by the cultivating claw attachment/detachment guide mechanism, the tilling claw can be easily and quickly attached/detached.

Next, FIGS. 7 to 12 show various cross-sectional shapes of the holder hole 5 of the claw holder 3 and the held portion 17 of the tilling claw 15. That is,
In the figure, the left and right inclined surfaces 11 and 1 of the holder hole 5
3, and the shapes of the holder portion 17 are changed. These drawings are all cross-sectional views of the portion corresponding to FIG. 3, and the holder portion 17
shows the neutral position state. Note that the convex portion 2
7 and the recess 29 are omitted.

In the cross-sectional shapes of these figures, the functions of the left and right inclined surfaces 11 and 13 as fixing parts for the holder part 17 are the same as described above, and the explanation thereof will be omitted.

This invention is not limited to the above embodiments,
Various modifications are possible. For example, the nail holder 3 side or both the nail holder 3 side and the held side 17 can be elastically deformed, and the reaction force can be used to fix them together. Further, by changing the angles and shapes of the inclined surfaces 11 and 13 in the holder hole 5, or the shape and wall thickness of the holder portion 17 to those other than those of the above-described embodiment, the fixing characteristics between the two may be changed as appropriate. is also possible. Furthermore, the shape of the convex portion 27 and concave portion 29 of the guide mechanism for attaching and detaching the tilling claws can be changed in various ways to change the guide characteristics and facilitate manufacturing. Further, the combination of the convex portion and the concave portion may be reversed from that in the above embodiment.

(f) Effects of the invention As is clear from the above explanation, the structure of this invention provides a support structure for the tilling claws that is easy to manufacture, easy to attach and detach, and can support strongly and reliably. can get.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a main part of an embodiment of this invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 is a - of Fig. 2.
4 is a sectional view taken along the - line in FIG. 2, FIG. 5 is a sectional view taken along the - line in FIG. 2, and FIG. 6 is a sectional view taken along the - line in FIG. 2. , FIGS. 7 to 12 are sectional views of the portions corresponding to FIG. 3 of different embodiments, and FIG. 13 is a side view of the conventional device.
FIG. 14 is a sectional view taken along the line X--X in FIG. 13. Explanation of main drawing symbols, 1... Cultivation axis, 3...
Claw holder, 5... Holder hole, 11... Inclined surface (fixed part), 13... Inclined surface (fixed part), 15...
Tilling claw, 17... held part, 27... convex part (guide mechanism for attaching and removing tilling claw), 29... recessed part (same as above).

Claims (1)

[Scope of utility model registration request] A claw holder protruding from a tilling shaft with a holder hole provided to removably and pivotably fit a held portion of a tilling claw, and a relative rotation between the claw holder and the holder. Due to the combined engagement of a fixing part provided in the holder hole and a convex part and a recess provided on the holder hole side and the held part side so that the two are fixed by the elastic deformation reaction force accompanying the movement. A support structure for a tiller claw, characterized by comprising a guide mechanism for attaching and removing the tiller claw.