JP2877654B2 - Tiller mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilling claw mounting device used for a rotary tilling machine.

[0002]

2. Description of the Related Art In a rotary tiller, a base of a tillage claw is inserted into a cylindrical claw mounting bracket fixed to a claw shaft.
There is one in which a tilling nail is detachably attached to the nail mounting bracket. Fixing the tilling nail to the nail mounting bracket with a bolt and a nut is time-consuming and troublesome, and the tilling nail is fixed by a fixture made of an elastic plate material.
No. 218502.

This device has a pair of opposed walls of a nail mounting bracket and a base of the tilling nail, and has a mounting shaft that is inserted so that the head comes into contact with the tilling nail and the tip side projects from one of the opposite walls. A locking portion is provided on the tip end side of the mounting shaft. On the other hand, the fixture has an engaging piece located on the opposite side of one of the opposing walls of the claw mounting bracket, and the engaging piece has an insertion / removal hole through which the locking portion of the mounting shaft can be inserted / removed. And, an engagement groove between the engagement portion of the attachment shaft and one of the opposing walls is formed so that the engagement groove can be inserted from the insertion / removal hole in a direction orthogonal to the axial direction. By driving the claws in the claw shaft rotation direction from the front to the rear so that the engagement shafts are inserted into the engagement grooves, both side edges of the engagement grooves are located between the locking portion and one of the opposing walls. The engagement piece is curved so that the engagement portion can be elastically engaged with the engagement portion so as to bias the locking portion away from one of the opposing walls by an elastic force.

[0004] In addition to the above configuration, the engaging piece is provided with one retaining piece having a contact portion that comes into contact with the claw mounting bracket on the rear side in the claw shaft rotation direction, and the claw mounting of the fixing tool is provided. Some of them are designed to prevent detachment from the bracket.

[0005]

The retaining piece is provided with a fixing device.
Elastically deforms at the time of driving and returns when driving is completed.
And the contact part is on the rear side in the claw shaft rotation direction of the claw mounting bracket.
Abut when the fastener is driven (and
At the time), and the conventional
Since the stopper is hard to be elastically deformed,
The engagement with the attached bracket was shallow. Soshi
Therefore, if the engagement of the contact portion with the claw mounting bracket is shallow,
This will reduce the reliability of preventing the fixture from coming off.
You.

[0006] By the way, the saw claws usually used in rotary tillers may cause vibrations and the like if a considerable number of till claws in the same bending direction are attached in succession. Installed. And
In the cultivating claw curved to the right and the cultivating claw curved to the left, the insertion direction of the mounting shaft is reversed, and accordingly, the position of the engaging piece attached to the claw mounting bracket facing wall is reversed.
For this reason, two types of fixtures were formed, one for a right-curved tilling claw and one for a left-curved tilling claw.

There is also a problem that the fixture loosens around the axis of the mounting shaft during tilling. Therefore, the present invention
The object is to improve the reliability of preventing the engagement piece from coming off , to enable the same engagement piece to be used regardless of the bending direction of the tilling claw, and to prevent rattling around the mounting axis of the engagement piece. And

[0008]

A solution for the present invention, technical means taken to achieve the object, the nail shaft 7, the axial direction
Is provided with a pair of opposed walls 12 and 13 which are opposed to each other.
From the opposing walls 12, 13 and the tilling claw 9 inserted between them
With a mounting shaft 17 with a head inserted through the
It is formed of a plate material and protrudes from one of the opposing walls 12.
The engagement groove 2 which engages with the engagement shaft portion 21 of the mounting shaft 17 in a cross shape.
7 is provided with an engagement piece 22 formed thereon, and an engagement shaft of the mounting shaft 17 is provided.
The engaging piece 22 is moved so that the portion 21 is inserted into the engaging groove 27.
By doing so, the head 18 of the mounting shaft 17 and one of the opposed walls 1
2 so that the base of the tilling claw 9 is pinched and fixed.
The moving direction of the engaging piece 22 of the one opposing wall 12 to the mating piece 22
Engagement comprise a contact portion 30 which engages in brought into contact with front end side
In the tilling claw mounting device provided with a retaining piece 29 for preventing the piece 22 from coming off from the one opposing wall 12 , the engaging piece 2
2, along the engaging groove 27 and perpendicular to the engaging groove 27
So as to wrap in the engaging groove 27 when viewed from the
A slit 28 is formed from the front end of the mating piece 22 in the moving direction to the rear.
The point lies in that the retaining piece 29 is formed by forming.

Further, in addition to the above configuration, the slit 28
Between the engagement shaft 21 at the movement completion position of the engagement piece 22
Formed so as to extend further in the moving direction of the engagement piece 22
Good to do . Further, in addition to the above configuration, the slit 28
Is preferably provided in a pair with the engaging groove 27 as a boundary.

Further, in addition to the above configuration, the engagement groove 27
The insertion opening for inserting the engagement shaft portion 21 and the movement of the engagement piece 22 are completed.
Width of the engagement groove 27 between the engagement shaft portion 21 at the end position
Is formed to be narrower than the diameter of the engagement shaft portion 21,
A pair of the sockets 28 are provided at line-symmetric positions with the engagement groove 27 as a boundary.
It is better to start.

[0011]

In order to attach the tilling nail to the nail mounting bracket, first, the base of the tilling nail is inserted between the opposing walls of the nail mounting bracket, and the mounting shaft is inserted through both opposing walls and the base of the tilling nail. Next, the engaging piece of the fixing tool is positioned on the opposite side of one of the opposing walls of the claw mounting bracket, and in this state, the engaging piece is inserted into the engaging groove of the mounting shaft of the mounting shaft. In the claw shaft rotation direction from the front to the rear.

Then, both side edges of the engaging groove are elastically engaged between the engaging portion and the one opposing wall, and the elastic force is applied to move the engaging portion away from the one opposing wall. By virtue of this, the base of the tilling nail is fixed in a sandwiching manner by the head of the mounting shaft and one of the opposing walls of the nail mounting bracket. Further, the contact portions of the pair of retaining pieces provided at a line symmetrical position with respect to the engagement groove contact the rear side in the claw axis rotation direction of the claw mounting bracket, and the engaging piece is disengaged from the claw mounting bracket. The retaining piece is prevented, and play of the engagement piece around the mounting shaft is prevented.

When fixing tilling nails having different bending directions, the mounting shaft is configured to be inserted in the opposite direction, so that the positions of the engaging pieces of the fixture are also reversed. Although the retaining piece is engaged with the mounting bracket, since the retaining piece is provided at a line symmetrical position with the engaging groove as a boundary, there is no problem even if the retaining piece is reversed and engaged with the claw mounting bracket.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 6, reference numeral 1 denotes a rotary cultivator mounted on the rear of the tractor via a three-point link mechanism so as to be able to move up and down. The machine frame 2 of the rotary cultivator 1 has a support arm 4 projecting left and right from a central gear case 3, a side frame 5 fixed to an outer end of one support arm 4, and a chain attached to an outer end of the other support arm 4. The main structure is a gate type with the case 6 fixed.

A claw shaft 7 is supported between the lower portion of the side frame 5 and the chain case 6 so as to be rotatable around a left-right axis, and a plurality of tilling claws 9 are mounted on the claw shaft 7 via a claw mounting bracket 8. Is attached from one end to the other end, and thereby the tilling unit 10 is configured. Then, the power of the PTO shaft of the tractor is transmitted from the input shaft 11 to the pawl shaft 7 via transmission mechanisms such as gears and chains built into the gear case 3, the support arm 4, and the chain case 6, respectively. Are driven to rotate in the direction of arrow A.

The tilling claws 9 are made of sawn claws, and are arranged by appropriately combining the tilling claws 9 having different bending directions.
As shown in FIGS. 1 to 4, the claw mounting bracket 8 is formed in a rectangular tube with a bottom, and is fixed to the claw shaft 7 so as to protrude radially outward. The base of the tilling nail 9 is inserted into the nail mounting bracket 8. In addition, a pair of opposing walls 12, which oppose each other in the claw axis direction of the claw mounting bracket 8,
13, a circular insertion hole 14 is formed in one opposing wall 12, a hexagonal fitting hole 15 is formed in the other opposing wall 13, and a circular through hole 16 is formed at the base of the tilling claw 9. Have been. These insertion hole 14, fitting hole 15 and through hole 1
6, a mounting shaft 17 is inserted and fitted.
As a result, the tilling nail 9 is retained.

A fitting hole 15 is provided at one end of the mounting shaft 17 in the axial direction.
The head 18 has a hexagonal head 18 that is fitted to the head 18 so that the head 18 cannot rotate relative thereto. The distal end side of the mounting shaft 17 protrudes from one of the opposing walls 12, and a circumferential groove is formed in this protruding portion, so that a locking portion 19 is formed at the distal end, and the mounting shaft 17 An engagement shaft portion 20 is formed between the engagement portion 19 and one of the opposing walls 12 of the protruding portion.

A fixture 21 which engages with the mounting shaft 17 to prevent the nail from being removed is fitted on the claw mounting bracket 8. The fixing member 21 is made of an elastic plate material such as spring steel, and has an engagement piece 22 located on the opposite side (outer surface) of the opposite wall 12 and an opposite side (outer surface) of the other opposite wall 13. ) Side, and both 22, 23
And a back wall 24 connecting the two to form a U-shaped cross section.

A contact portion 25 for contacting the head 18 of the mounting shaft 17 is formed on the distal end of the pressing piece 23, and a locking portion 19 of the mounting shaft 17 is provided on the distal end of the engaging piece 22. A circular insertion / removal hole 26 that can be inserted in the direction is formed.
An engagement groove 27 is formed from 6 toward the back wall 24 so that the engagement shaft portion 20 of the mounting shaft 17 can be inserted in a direction orthogonal to the axial direction and the locking portion 19 cannot be inserted in the axial direction. The engaging groove 27 is formed so that the groove width of the insertion side portion and the groove depth portion is slightly larger than the diameter of the engagement shaft portion 20, and the groove width between the insertion side portion and the groove depth portion. Are formed in a narrow width slightly smaller than the diameter of the engagement shaft portion 20.

At both ends of the engaging piece 22 in the direction orthogonal to the longitudinal direction of the engaging groove 27, an open slit 28 is formed in the engaging groove 27 from the back wall 24 toward the tip of the engaging piece 22. The retaining piece 29 is provided by being formed along. These retaining pieces 29 are provided at line symmetrical positions with the engaging groove 27 as a boundary, and the distal end side of each retaining piece 29 is bent toward the pressing piece 23 side to form the pawl shaft 7 of the pawl mounting bracket 8. The contact portion 30 is provided to contact the outer surface on the rear side in the rotation direction A.

The longitudinal center of the engaging groove 27 between the retaining pieces 29 of the engaging piece 22 is curved in a direction away from one of the opposing walls 12. The back wall 24 has a protruding portion 31 projecting outward from one end to the other end. In the above configuration, in order to fit the fixing tool 21 to the claw mounting bracket 8 and mount and fix the tilling claw 9, as shown by a virtual line in FIG.
4 is positioned forward of the claw shaft 7 in the rotation direction A of the claw mounting bracket 8 so that the insertion / removal hole 26 of the engaging piece 22 corresponds to the locking portion 19 of the mounting shaft 17 and the locking portion is inserted into the insertion / removal hole 26. The engagement piece 22 is brought into contact with one of the opposing walls 12 with the insertion shape 19. From this state, as shown by the solid line in FIG.
1 is moved in the direction opposite to the rotation direction A of the claw shaft 7 so that the engaging shaft portion 20 of the mounting shaft 17 is inserted into the entrance portion of the engaging groove 27 and the pressing piece 23 is expanded outward. The contact portion 25 contacts the head 18 of the mounting shaft 17.

Next, from the state described above, the fixing piece 21 is moved in a direction opposite to the claw shaft rotation direction A by hitting the back wall 24 with a hammer or the like, so that the engagement piece 22 is in contact with the locking portion 19. It is elastically deformed between the opposing wall 12, and the elastic force urges the locking portion 19 in a direction away from the one opposing wall 12, and the head 18 of the mounting shaft 17 applies the elastic force of the pressing piece 23. Thus, the base of the tilling claw 9 is pressed by the head 18 of the mounting shaft 17 and the one opposing wall 12 of the claw mounting bracket 8 so as to be clamped.

The contact portion 30 of the retaining piece 29 contacts the outer surface of the claw mounting bracket 8 on the rear side in the rotation direction A of the claw shaft 7 to prevent the fixing tool 21 from being detached from the claw mounting bracket 8. At the same time, the play around the axis of the mounting shaft 17 of the fixture 21 is prevented. Further, when fixing the tilling claw 9 having a different bending direction from that of the above, the mounting shaft 17 is configured to be inserted in the opposite direction to the illustrated example.
Is engaged with the claw mounting bracket 8 such that the positions of the engaging piece 22 and the pressing piece 23 are opposite to those in the illustrated example.
Is provided at a line symmetrical position with respect to the engagement groove 27, so that there is no problem even if the hook is fitted to the claw mounting bracket 8 in reverse.

When the fixing tool 21 is driven, it is hit with the protrusion 31 of the back wall 24 as a mark, thereby providing an effect that the hitting position becomes clear. As shown in FIG. 2, at the position where the engaging piece 22 is fixed to the tilling claw 9, the top 22 a of the engaging piece 22 is located behind the locking part 19 in the claw axis rotating direction A, and The distal end side is located more inward than the outer surface of one of the opposing walls 12, and also regulates the movement of the fixture 21 in the removal direction.

[0025]

According to the present invention, the engaging piece 22 is provided with the engaging groove.
27 and from a direction perpendicular to the engaging groove 27.
The engaging piece 22 moves so as to wrap around the engaging groove 27 when viewed.
Forming the slit 28 from the front end to the rear in the direction
By forming the retaining piece 29 with
Elastic deformation is facilitated, and attachment / detachment of the engagement piece 22 is facilitated.
At the same time, the elastic deformation of the retaining piece 29 is facilitated.
The contact portion 30 of the stop piece 29 is connected to the engagement piece 2 of the one opposing wall 12.
2 It can be engaged deeply to the front end side in the movement direction.
Reliance on preventing piece 22 from coming off one of opposing walls 12
Can be enhanced.

Further , the slit 28 is formed with the engagement groove 27 as a boundary.
By providing a pair, the same fixing tool can be used regardless of the bending direction of the tilling claw, and play around the mounting axis of the fixing tool can be prevented. In addition, the engagement groove 2
7, an insertion opening for inserting the engagement shaft portion 21,
Of the engagement groove 27 between the engagement shaft portion 21 at the movement completion position.
The groove width is formed to be smaller than the diameter of the engagement shaft portion 21.
As a result, the engaging shaft 21 passes through the narrow portion of the engaging groove 27.
Otherwise, it will not come out of the engagement groove 27 relatively,
The piece 22 is reliably prevented from coming off from one of the opposing walls 12.
And the slit 28 is separated from the engagement groove 27.
By providing a pair at a line symmetrical position, the engagement shaft 2
The elastic deformation occurs when 1 passes through the narrow portion of the engagement groove 27.
It will be easier.

[Brief description of the drawings]

FIG. 1 is an overall side view.

FIG. 2 is a plan sectional view of FIG.

FIG. 3 is a plan view of the fixture not attached to the claw mounting bracket.

FIG. 4 is a rear sectional view.

FIG. 5 is a cross-sectional plan view showing the fitting operation of the fixture.

FIG. 6 is an overall side view of the cultivator.

[Explanation of symbols]

 7 Claw Shaft 8 Claw Mounting Bracket 9 Tilling Claw 12 Opposed Wall 13 Opposed Wall 17 Mounting Shaft 18 Head 19 Locking Part 20 Engagement Shaft Part 21 Fixture 22 Engagement Piece 27 Engagement Groove 29 Stopping Piece 30 Contact Part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-52401 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) A01B 33/10-33/14

Claims (4)

(57) [Claims] 1. A claw shaft (7), which is disposed so as to face in the axial direction.
A pair of opposed walls (12) and (13)
Walls (12), (13) and tilling nail inserted between them
A mounting shaft (17) with a head is inserted through the base of (9).
And an opposing wall made of elastic plate material
The engagement shaft (2) of the mounting shaft (17) protruding from (12).
1) An engagement groove in which an engagement groove (27) engaging in a cross shape is formed.
A mating piece (22) is provided, and the engaging shaft (2) of the mounting shaft (17) is provided.
The engagement piece (22) is inserted so that 1) is inserted into the engagement groove (27).
By moving the head (18) of the mounting shaft (17)
Hold the base of the tilling claw (9) with one of the opposing walls (12).
The engaging piece (22) is provided on one of the opposing walls.
(12) is brought into contact with the front end of the engagement piece (22) in the movement direction.
An engagement portion (30) for engaging is provided, and the engagement piece (22)
A retaining piece (2 ) for retaining from one opposing wall (12)
9) In the tilling claw mounting device provided with 9), the engaging piece (22) is formed along the engaging groove (27).
And the engagement groove viewed from a direction orthogonal to the engagement groove (27).
(27) The direction of movement of the engagement piece (22) so as to wrap around
Forming a slit (28) from the front end to the rear
A tilling claw mounting device characterized in that the retaining piece (29) is formed by the above method. 2. A slit (28) is formed in the engagement piece (22).
From the engagement shaft (21) at the movement completion position,
The piece (22) is formed so as to extend backward in the moving direction.
The tilling claw attachment device according to claim 1, wherein: 3. A slit (28) and an engagement groove (27)
A pair is provided as a boundary.
A mounting device for a tillage claw according to item 1. 4. The engagement shaft (21) of the engagement groove (27) is
Between the insertion opening to be inserted and the movement completion position of the engagement piece (22).
The groove width of the engagement groove (27) between the engagement shaft (21) and
The engagement shaft (21) is formed to have a width smaller than the diameter of the engagement shaft (21).
(28) at a line symmetrical position with respect to the engagement groove (27).
4. The method according to claim 1, wherein
The mounting device of the tilling nail as described.