JPH09262001A - Tillage operating unit of tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide tillage operating units of a tiller capable of simply and rapidly connecting the plural tillage operating units of the tiller so as not to cause the rattling. SOLUTION: The tillage operating units of a tiller are obtained by a forming an inserted part on one terminal side of a tillage cylinder 10 in the axial direction, forming a connecting shaft A1 on the other terminal side thereof, providing the connecting shaft A1 on the side of the tillage cylinder 10 with a polygonal shaft part 12 from the side of the tillage cylinder 10 and the outside in the axial direction with an inserting shaft part 13 having a fixing large-diameter part 13a on the outer end in the axial direction and forming the part between the fixing large-diameter part 13a and the polygonal part 12 into a guiding small-diameter part 13b. The diameter D1 of the fixing large-diameter part 13a is regulated so as to be slightly larger than the diameter D2 of the virtual inscribed circle of the polygonal shaft part 12 and the diameter D3 of the guiding small-diameter part 13b is regulated so as to be smaller than the diameter D2 of the virtual inscribed circle of the polygonal shaft 12. A tapered part 14 is formed at the boundary part between the guiding small-diameter part 13b and the polygonal shaft part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cultivating work body for a cultivator, which can connect a plurality of cultivating work bodies easily and quickly and can be connected without backlash.

[0002]

2. Description of the Related Art Conventionally, a cultivating body having a plurality of wheels and cultivator blades according to various working conditions is provided on a cultivating shaft protruding from both left and right sides of a power transmission case of a cultivating machine (including a rotary type). It is equipped with attachments for running or plowing work. The cultivating shaft is formed in a polygonal shape such as a hexagonal shape or a square shape in a cross section orthogonal to the axial direction, and a polygonal shaft inserting hole into which the cultivating shaft is inserted is provided on the attachment side. The shaft insertion hole has a size such that the cultivating shaft hardly looses.

In such an attachment, a plurality of the plowing work bodies may be connected in the axial direction to widen the plowing work width. For this reason, a plurality of tilling work bodies to be connected are connected to each other, and therefore, bending or bending due to its own weight occurs. Further, during the plowing work, plowing resistance from the cultivated land is applied to the plowing work body, and the bending and bending of the plowing work body are further increased.

[0004]

In the connection work of a plurality of plowing work bodies, in order to transmit the rotation, the shaft often has a polygonal cross-section such as a hexagon, and therefore, the insertion shaft and the inserted shaft are inserted. At the time of insertion into the square hole, it is necessary to make the respective corners coincide with each other, and therefore, the insertion work cannot be easily carried out in the connection work such as night work or darkness.

Further, since the shaft inserting work between the tilling work bodies is a polygon such as a hexagonal shape or a square shape, and the rattling work bodies are prevented from rattling, the play during insertion is extremely small. , If the corners do not completely match, the tiller shaft will not enter the shaft insertion hole. Furthermore, since it is necessary to consider the position of the pull-out prevention pin, replacement work of the attachment becomes even more difficult and troublesome, physical fatigue and mental fatigue overlap, and it is not easy to do this work alone, It took time and was exhausted.

[0006]

Therefore, as a result of intensive studies by the inventor to solve the above-mentioned problems, the present invention has revealed that the present invention has a connecting shaft at one end in the axial direction of a tiller and an insertion portion at the other end. The connecting shaft is a polygonal shaft portion from the side of the tiller, the axial outside is an insertion shaft portion, and the insertion shaft portion has an axial outer end portion as a fixing large diameter portion, and the fixing large diameter portion. And a small diameter portion for guiding between the polygonal shaft portion, the diameter of the large diameter portion for fixing is slightly larger than the diameter of the virtual inscribed circle of the polygonal shaft portion, and the diameter of the small diameter portion for guiding. Is smaller than the diameter of the polygonal shaft portion virtual inscribed circle, and by using a cultivating work body of a cultivator having a tapered portion at the boundary between the guiding small diameter portion and the polygonal shaft portion, a wheel, It is possible to easily and swiftly perform a replacement work of a tilling work body or the like having a plurality of tilling blades, thereby solving the above problems.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. First, the engine 1 is mounted on the frame 2. The drive from the engine 1 drives the cultivating shaft 4 located below the frame 2 through a transmission mechanism such as a power transmission case 3 in which a mechanism such as a pulley, a belt and a chain is installed (see FIG. 15). The operation handle 5 is the frame 2 where the engine 1 is mounted.
It is tilted upward from the protrusion or the casing part provided on the rear side and is provided so that the elevation angle can be adjusted in multiple stages, and the elevation angle can be fixed freely at a desired position according to the worker's height and work situation. Has been.

The power transmission case 3 is provided with a tilling shaft 4 so as to project to the left and right sides. A chain sprocket is provided at the center of the cultivating shaft 4 in the axial direction, and is housed inside the power transmission case 3. On the tilling axis 4,
In the agricultural work, the cultivating cylinder 10 equipped with the cultivating blade 11 is mounted to perform the cultivating work, but wheels can be mounted to drive on the general road.

Next, in the cultivating work body A, the cultivating cylinder 10
Has a polygonal cross section orthogonal to the axial direction, and has a substantially hexagonal cross section [see FIG. 1 (A)]. Alternatively, there is a triangular shape (see FIG. 15), a square shape, a pentagonal shape, an octagonal shape, or the like. On each outer peripheral side surface of the tiller 10,
Holders 10b, 10b, ... Are provided, and the plowing blades 11, 11, ... Are mounted on the holders 10b, 10b ,. As another type of the cultivating work body A, four plowing blades 1 are provided at each corner of the substantially square plowing plate 20.
, 11 are fixed to each other (see FIG. 16).

The cultivating cylinder 10 and the cultivating plate 20 are provided with the inserted portion 15 at the center thereof. The inserted portion 15 has a rectangular tubular shape (see FIG. 4). Further, the cultivating cylinder 10 is provided with a connecting hole portion 10a, and the inserted portion 15 is provided with a fixing through hole 15b. Then, when the connecting shaft A ₁ described later is inserted into the inserted portion 15, the fixing pin 16 is inserted through the fixing through hole 17, the connecting hole portion 10a, and the fixing through hole 15b provided in the connecting shaft A _1. , The inserted portion 15 and the connecting shaft A ₁ can be connected and fixed [see FIGS. 3 (A) and 3 (B)].

As shown in FIG. 1 (A), the cultivating work body A is provided with a connecting shaft A _{1 and} is composed of a polygonal shaft portion 12 and an insertion shaft portion 13. The polygonal shaft portion 12
Is formed in various polygons in a cross section orthogonal to the axial direction, and a hexagon is particularly preferable, but other shapes such as a square, a triangle, a pentagon or an octagon may be used. In the embodiment of the present invention, the cross section orthogonal to the axial direction of the polygonal shaft portion 12 will be mainly described as a hexagon.

As shown in FIG. 1 (B), FIG. 4, etc., the insertion shaft portion 13 has a large diameter portion 13a for fixing and a small diameter portion 13 for guiding.
b, and the large diameter fixing portion 13a and the small diameter guiding portion 13b are continuous in the axial direction. Further, the guiding small diameter portion 13b is formed between the fixing large diameter portion 13a and the polygonal shaft portion 4. The large-diameter fixing portion 13a and the small-diameter guiding portion 13b of the insertion shaft portion 13 have a circular cross-sectional shape orthogonal to the axial direction.

The insertion shaft portion 13 and the polygonal shaft portion 12 are formed continuously. Further, the polygonal shaft portion 12 to the insertion shaft portion 13 may be integrally formed, or the insertion shaft portion 13 may be a separate member and fixed to the shaft end of the polygonal shaft portion 12 by welding means or the like. . The polygonal shaft portion 12 and the narrow guide portion 1
A taper portion 14 is formed at the boundary with 3b [see FIGS. 4 (A) and 4 (B)].

The diameter D ₁ of the large diameter fixing portion 13a is
The diameter D ₂ is slightly larger than the diameter D _{2 of} the polygonal shaft portion virtual inscribed circle 12d inscribed in the cross section (hexagonal cross section) orthogonal to the polygonal shaft portion 12 in the axial direction [FIG. 4 (A),
(See (B) and (C)). Further, the diameter D ₃ of the guide small diameter portion 13b is smaller than the diameter D ₂ of the polygonal shaft portion virtual inscribed circle 12d. That is, the diameter D ₁ of the guiding thin portion 13b is the largest, the diameter D _{2 of the} polygonal shaft portion virtual inscribed circle 12d is the _second largest, and the diameter D ₃ of the guiding thin portion 13b is the smallest. And D ₁ > D ₂ > D ₃ [Fig. 4
(See (A) and (B).)

When the connecting shaft A ₁ is inserted into the inserted portion 15, the insertion shaft portion 13 is inscribed in the inserted rectangular hole of the inserted portion 15, and the inserted shaft portion 15 inserts the connecting shaft A ₁ into the inserted shaft portion 15. Part 13
Is structured so as to be supported in the axial direction, so that the bending in the axial direction is minimized. The diameter D _{0 of the} inserted portion side inscribed circle 15d on the inner circumference of the inserted portion 15 having a hexagonal cross section is referred to (see FIGS. 5A and 5B).

The diameter D ₀ of the inscribed circle 15d on the inserted portion side is
It is the distance between inner wall surfaces that face each other in parallel on the inner peripheral surface of the inserted portion 15 having a hexagonal cross section. Then, with the tilling shaft A ₁ inserted in the inserted portion 15 [see FIG. 6 (A)], the diameter D _{0 of the} inserted portion side inscribed circle 15d and the fixing large diameter portion 13a of the insertion portion 13 are described. 6 has a minimum clearance with the diameter D ₁ of the polygonal shaft [see FIG. 6B], and the clearance between the diameter D ₀ and the diameter D ₂ of the polygonal shaft portion virtual inscribed circle 4d of the polygonal shaft portion 4 is slightly large [FIG. 6 (C)]. Further, the diameter D ₃ of the guide thin portion 13b and the inscribed circle 15d on the inserted portion side
Has the maximum clearance with the diameter D ₀ [Fig. 6
(D)].

The inserted portion 15 is hollow, and the hollow portion serves as an inserted square hole 15a into which the connecting shaft A ₁ is inserted.
The cross-sectional shape of the inserted square hole 15a on the inner peripheral side is the connecting shaft A ₁
It has the same shape as the polygonal shaft portion 12. That is, the polygonal shaft portion 12
In the case of the embodiment having a hexagonal shape, the inner peripheral shape of the inserted square hole 15a is also a hexagonal shape, and there is almost no rattling with the polygonal shaft portion 12, and the accuracy is such that insertion is possible. have.

Further, the strip-shaped support surface 13d of the insertion shaft portion 13,
13d, ... are substantially in contact with the inner peripheral side surface of the inserted portion 15 of the cultivating work body A. That is, the contact state between the inner peripheral side surface of the inserted square hole and the polygonal shaft portion 12 can be maintained in the insertion shaft portion 13 in substantially the same manner, and the inserted portion 15 can be inserted into the polygonal shaft portion 12 and the insertion portion. The structure is such that play is extremely unlikely to occur over the shaft portion 13.

The basic tilling work body B is mounted on the tilling shaft 4 projecting from the power transmission case 3, and the inserted portions 15, 15 are provided on both sides in the axial direction thereof, and one inserted portion 15 is The cultivating shaft 4 of the power transmission case 3 is inserted, and the other inserted portion 15 is where the connecting shaft A ₁ of the cultivating work body A is inserted [see FIGS. 3 (A) and 3 (B)].

Next, as a second embodiment of the connecting shaft A ₁ , the diameter D of the insertion shaft portion 13 is the same as in the first embodiment.
₁ is slightly larger than the diameter D ₂ of the virtual inscribed circle 12d, and further, a plurality of belt-shaped supporting surfaces which are in the same plane as the respective side surfaces forming the polygonal shape of the polygonal shaft portion 12 in the insertion shaft portion 13. 13d, 13d, ... are formed [FIG.
(A) and (B) and FIGS. 10A and 10B]. Then, the virtual inscribed circle 12d is, as shown in FIG.
It is shown by an imaginary line (two-dot chain line), and the large diameter portion 13 for fixing
a is shown by a solid line. It is shown that the imaginary line showing the diameter D ₂ of the virtual inscribed circle 12d is slightly smaller than the diameter D ₁ of the large diameter fixing portion 5a.

The band-shaped support surfaces 13d, 13d, ... Are formed on the circumferential side surface of the insertion shaft portion 13 at substantially equal intervals. For example, in the embodiment in which the cross section orthogonal to the axial direction of the polygonal shaft portion 12 has a hexagonal shape, the insertion shaft portion 13 has six strip-shaped support surfaces 13d, 13d ,. Then, the inserted portion 15 is supported along the axial direction so as to prevent backlash. The polygonal shaft portion 12 is formed with a fixing through hole 17 for a fixing pin 16 used as an external stop after the plowing work body A is mounted. A fixing through hole 13b is also formed in the insertion shaft portion 13, and the tip end portion of the insertion shaft portion 13 is chamfered.

Further, the insertion shaft portion 13 has a mark line groove 13e.
Are formed. The mark linear groove 13e is the insertion shaft portion 13
FIG. 12 shows the position of the fixing through hole 5c formed in the guiding small-diameter portion 13b, which is inserted toward the center of the fixing through hole 13c as shown in FIGS. It is formed along the axial direction of the shaft portion 13. As shown in FIG. 12B, the mark linear groove 13e is formed in a groove shape, and an operator can confirm the position of the fixing through hole 13c by the feel of the hand. Then, as shown in FIG. 13, the insertion shaft portion 13 is attached to the rotary shaft 10 so that the mark linear groove 13e is aligned with the connecting hole portion 10a of the attachment B.

[0023]

First, the work of connecting a plurality of tilling work bodies A, A, ... In the axial direction will be described. First, power transmission case 3
A basic tilling work body B is mounted on the drive shaft 4 of the above. Then, the basic tilling work body B has the inserted portion 1 at both ends in the axial direction.
5, 15 are formed. The large diameter portion 1 for fixing the insertion shaft portion 13 of the tilling work body B to the inserted portion 15 of the tilling work body A.
Insert from 3a [see FIG. 9 (A)]. At this time,
The corners of the connecting shaft A _{1 with} the polygonal shaft portion 12 and the corners of the inner peripheral side surface of the inserted portion 15 do not have to correspond to each other in terms of position, for example, FIG. 7 (A). As shown in, the positions of the corners of the inner peripheral side surface of the inserted portion 15 and the corners of the polygonal shaft portion 12 may not match.

Next, while the plowing work body A is appropriately rotated in the axial direction, the inserted angular hole 15a of the inserted portion 15 and the side surface on which the through hole for fixing the polygonal shaft portion 12 is formed are aligned with each other. Then, each corner of the inner peripheral side surface of the inserted portion 15 is connected to the polygonal shaft portion 12
To the positions corresponding to the respective corners (see FIG. 7B). Next, the polygonal shaft portion 12 of the connecting shaft A ₁ is inserted into the inserted square hole so that the through hole and the fixing through hole of the connecting shaft A ₁ are aligned with each other.

Next, from the outside of the tilling work body A, the fixing pin 1
Plug 6, to fix the tilling body A to the connecting shaft A ₁ are passed through the fixing pin 16 to the fixing through-hole of the connecting shaft A ₁ and the through hole of the insertion portion 15. 8A, 8B, and 8C show a series of work situations. At this time, the inserted portion 15
By aligning the opening portion of 14 with the taper portion 14 of the connecting shaft A ₁ , it becomes easy to rotate the inserted portion 15 in the axial direction, and further, to insert the inserted portion 15 from the insertion shaft portion 13 to the polygonal shaft portion 12 side. It becomes easy to push it into. The mounting process is the same for the single wheel management machine.

[0026]

According to the first aspect of the invention, the tiller 10
In the axial direction of the insertion portion 15 at one end and the connecting shaft A ₁ at the other end
And the connecting shaft A ₁ is a polygonal shaft portion 1 from the side of the cultivating cylinder 10.
2, the outer side in the axial direction is the insertion shaft portion 13, and the insertion shaft portion 1
Reference numeral 3 designates an axially outer end portion as a large-diameter portion 13a for fixing, and a small-diameter portion 13b for guiding between the large-diameter portion 13a for fixing and the polygonal shaft portion 15, and a diameter of the large-diameter portion 13a for fixing. D ₁ is slightly larger than the diameter D ₂ of the imaginary inscribed circle 12d of the polygonal shaft section 12, the diameter D ₃ of the guide for the small diameter portion 13b than the diameter D ₂ of the polygonal shaft section imaginary inscribed circle 12d First, the attachment B on the cultivating shaft A ₁ is made smaller by making it smaller and using the cultivating work body of the cultivator in which the tapered portion 14 is formed at the boundary between the guiding small diameter portion 13b and the polygonal shaft portion 12.
The replacement work can be performed easily and with a little labor, and secondly, various effects can be obtained such that the backlash can be extremely reduced.

To explain the above effect in detail, the connecting shaft A ₁ is composed of a polygonal shaft portion 12 and an insertion shaft portion 13, and the insertion shaft portion 13 has a fixing large diameter portion 13a and a guiding small diameter portion. Thirteen
b, and a small diameter portion 13b for guiding is provided between the fixing large diameter portion 13a and the polygonal shaft portion 12. Further, the diameter D ₁ of the fixing large diameter portion 13a is slightly larger than the diameter D ₂ of the polygonal shaft portion virtual inscribed circle 12d of the polygonal shaft portion 12, and the diameter D ₃ of the guiding small diameter portion 13b is polygonal. The diameter is set to be smaller than the diameter D ₂ of the virtual inscribed circle 12d of the shaft portion.

Therefore, the attachment B having the inserted portion 15 whose inner peripheral side surface is similar to the polygonal shaft portion 12 is connected to the connecting shaft A.
When mounted on ₁ , the insertion shaft portion 13 at the tip of the connecting shaft A ₁
The large diameter portion 13a for fixing is inserted into the inserted portion 15 of the attachment B. Therefore, the connecting axis A
_{When the 1} is inserted into the inserted portion 15, the guiding thin portion 13
b is a non-contact portion when it is inserted into the inserted portion 15, so that the insertion shaft portion 13 can be easily inserted [FIG.
(See (A)]. In addition, the inserted portion 15 or the insertion shaft portion 13
Even if it touches a little at the time of insertion, it can be inserted because the thin guide portion 13b is not in contact [see FIG. 14 (B)].

This operation is extremely simple and quick. That is, in the conventional type, since the entire cross section has a polygonal shape in the axial direction, the inserted portion 15 of the attachment B must be aligned with the polygonal axis from the beginning of the mounting operation. While searching for a place where the corners match each other, the hand of the worker holding the attachment B is fatigued by the weight of the attachment B, and the physical and mental fatigue of the worker is increased. On the other hand, in the present invention, _first , by inserting the insertion shaft portion 13 of the connection shaft A ₁ into the insertion portion 15 of the attachment B, the attachment B is brought into a substantially temporarily fixed state with respect to the connection shaft A ₁ . can do.

Therefore, the worker attaches to the attachment B.
The hand for exchanging the attachment B does not need to be held in the hand, and has a much higher degree of freedom than the conventional type, and it is possible to perform good work without causing physical fatigue or burden on the worker. It is possible.

Further, in the present invention, the connecting shaft A ₁ is composed of the polygonal shaft portion 12 and the insertion shaft portion 13,
This is a structure in which an insertion shaft portion 13 having a circular cross section is simply provided at the tip of the polygonal shaft portion 12. Therefore, there is also an advantage that the shape and structure can be simplified and the price can be reduced.

Further, a small diameter portion 5b for guiding the insertion shaft portion 13
The insertion shaft portion 1 is formed by forming a taper portion 14 between the polygonal shaft portion 12 and the polygonal shaft portion 12 as a connecting shaft in a cultivator.
When the inserted portion 15 is inserted into the polygonal shaft portion 12 via 3, the tapered portion 14 makes the deformed state between the insertion shaft portion 13 and the polygonal shaft portion 12 smooth, and the attachment B
When pushing the inserted portion 15 into the polygonal shaft portion 12 from the thin guide portion 5b of the insertion shaft portion 13, there is no feeling of resistance or impact,
It can be installed more easily and smoothly.

Next, in the invention of claim 2, in claim 1, the fixing large-diameter portion 13a has a plurality of strip-shaped support surfaces 13d, 13 which are flush with the respective side surfaces of the polygonal shaft portion 12.
The support of the attachment B can be further stabilized by using the connecting shaft in the cultivator formed by forming d, ....

That is, the belt-shaped support surfaces 13d, 13d, ... Formed around the large diameter fixing portion 13a are the large diameter fixing portion 13a.
Since the diameter D ₁ of a is slightly larger than the diameter D ₂ of the virtual inscribed circle 12d of the polygonal shaft portion and is formed so as to be flush with each side surface of the polygonal shaft portion 12, it is inserted. Part 15
The contact state similar to the contact state between the inner peripheral side surface of the shaft and the polygonal shaft portion 12 is inserted through the belt-shaped support surfaces 13d, 13d ,.
3 can be maintained. Therefore, not only the polygonal shaft portion 12 of the connecting shaft A ₁ but also the large-diameter fixing portion 1 of the insertion shaft portion 13 is fixed.
Also in 3a, it is possible to prevent looseness between the inserted portion 15 and the inner peripheral side surface.

Next, in the invention of claim 3, in claim 1, the insert shaft portion 13 is formed with a mark line groove 13e which passes through the opening of the fixing through hole 13c orthogonal to the axial direction and is cultivated. When the connecting shaft A ₁ is inserted into the inserted portion 15, the mark linear groove 13e is formed by using the tilling shaft in the machine.
Is inserted while matching the position of the connecting hole 10a of the tilling work body A, the positions of the large diameter portion 5a for fixing the tilling shaft and the connecting hole portion 10a can be matched, and the fixing pin 16 Can be mounted very efficiently.

[Brief description of drawings]

FIG. 1A is a perspective view of a tilling work body according to the present invention, and FIG. 1B is a perspective view of a connecting shaft.

[Figure 2] Vertical side view of the tiller

FIG. 3 (A) is a schematic sectional view showing a state in which a basic tilling work body and a plurality of tilling work bodies are separated. Figure

FIG. 4A is a side view of the connecting shaft, FIG. 4B is a side view of the connecting shaft viewed from another direction, and FIG. 4C is a view of the connecting shaft viewed from the fixing large diameter portion side.

FIG. 5A is a plan view showing a state in which the insertion shaft portion of the connection shaft is separated from the insertion shaft portion, and FIG. 5B is a view taken along line X ₀ -X _{0 of} FIG. 5A.

FIG. 6 (A) is a plan view showing a state in which the inserted shaft portion is inserted into the insertion shaft portion of the connecting shaft and the respective corners are aligned with each other. (B) is a cross-sectional view taken along line X ₁ -X ₁ of (A). Figure (C) is X ₃ -X ₃ cross-sectional view along a line X ₂ -X ₂ cross-sectional view along a line (a) (D) is (a)

FIG. 7 (A) is a side view showing a state in which the insertion shaft portion of the connection shaft is inserted into the insertion shaft portion, and FIG. 7 (B) is a view in which the insertion shaft portion of the connection shaft is inserted into the insertion shaft portion and the connection shaft is rotated. Side view

8A, 8B, and 8C are perspective views showing a process of inserting the connecting shaft into the inserted shaft portion.

FIG. 9A is a perspective view of a tilling work body provided with a connecting shaft of another embodiment, and FIG. 9B is a perspective view of a connecting shaft of another embodiment.

FIG. 10A is a perspective view of a connecting shaft as seen from a polygonal shaft portion of an embodiment in which a large-diameter fixing portion has a belt-like supporting surface. FIG. 10B shows a large-diameter fixing portion having a belt-like supporting surface formed therein. Side view of the embodiment (C) is a cross-sectional view taken along arrow X ₄ -X ₄ of (B)

11A is a vertical sectional side view of a state in which a connecting shaft having a belt-like support surface is inserted into an inserted shaft portion. FIG. 11B is a cross-sectional view taken along arrow X ₅ -X _{5 of} FIG. B) Cross-sectional view of the main part

FIG. 12 (A) is a side view of a connecting shaft provided with a mark-shaped groove (B) is a cross-sectional view taken along line X ₆ -X ₆ of (A).

FIG. 13 is a perspective view showing a state in which plowing work bodies are connected to each other.

FIG. 14 (A) is an operation diagram showing a state in which the inserted shaft portion is inserted into the insertion shaft portion of the connection shaft. FIG. 14 (B) is a view showing that the insertion shaft portion of the connection shaft is slightly inclined with respect to the insertion shaft portion. Action diagram showing the state that can be inserted

FIG. 15 is a perspective view of an embodiment in which the tilling work body has a triangular shape.

FIG. 16 is a perspective view of a tilling work body according to another embodiment.

FIG. 17 is a front view of a state in which a tilling work unit is connected to and mounted on a tiller.

[Explanation of symbols]

A ₁ ... Connection shaft 10 ... Cultivating cylinder 12 ... Polygonal shaft portion 12d ... Polygonal shaft portion virtual inscribed circle 13 ... Insertion shaft portion 13a ... Fixed large diameter portion 13b ... Guide small diameter portion 13d ... Belt support surface 13e ... Mark Linear groove 14 ... Tapered portion 15 ... Inserted portion

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[Procedure amendment]

[Submission date] June 27, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (3)

[Claims] 1. A shaft to be inserted is formed on one end side in the axial direction of a tiller and a connecting shaft is formed on the other end side, the connecting shaft is a polygonal shaft portion from the tiller side, and an axially outer side is an inserting shaft portion, The insertion shaft portion has an axially outer end portion as a fixing large diameter portion, and a portion between the fixing large diameter portion and the polygonal shaft portion is a guiding small diameter portion, and the diameter of the fixing large diameter portion is The diameter of the virtual inscribed circle of the polygonal shaft portion is slightly larger than that of the virtual inscribed circle of the polygonal shaft portion, and the diameter of the guide thin diameter portion is smaller than that of the virtual inscribed circle of the polygonal shaft portion. The cultivating work body of the cultivator, which is characterized in that a taper portion is formed at the boundary of. 2. The diameter of the large-diameter fixing portion is slightly larger than the diameter of a virtual inscribed circle of the polygonal shaft portion, and the large-diameter fixing portion has a diameter of the polygonal shaft portion. A tilling work body of a tiller, which is formed by forming a plurality of strip-shaped support surfaces that are flush with each side surface. 3. The cultivating shaft for a cultivator according to claim 1, wherein the inserting shaft portion is formed with a mark line groove passing through an opening of a fixing through hole orthogonal to the axial direction.