JPH09285203A - Tilling claw fitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tilling claw fitting device composed of a simple washer piece which can be fitted with two bolts as a mono-block to make easy fitting and removal of tilling claws, allows easy fitting and removal of tilling claws, does not require bolt head locking operation, and can lessen claw fitting/removal labor. SOLUTION: This tilling claw fitting device comprises a flange 13 fixed to a tilling shaft 12, a plurality of tilling claws fitted radially to the flange 13, two bolts and nuts which fix each tilling claw 14 to the flange 13 via a washer piece 21 which has a contact plate for contact with the end part 16 of each claw 14, and through-holes 26 for inserting the two bolts 22. The two bolts 22 have a bolt shank inserted into the through-hole 26 and a bolt head 29 which comes into contact with the opening fringe of the through-hole 26, respectively. The end of the bolt shank has a knurled shank part where knurls have been formed. The knurled shank part of each of the two bolts is inserted into a through-hole 26 on either end part of the contact plate and fitted to the plate by compression so that the two blots 22 are fixed to both ends of the washer piece 21, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plow attachment device, for example, a device for attaching a large number of plows of a rotary tiller for plowing a field.

[0002]

2. Description of the Related Art Conventionally, as a plowing pawl mounting device of this type, as described in JP-A-6-335302, a plurality of plowing pawls are radially arranged on a flange of a plowing shaft, and Each washer plate is brought into contact with a washer plate having a rotation-preventing portion for the bolt head, and two bolts are respectively inserted from the washer plate into each of the tiller plates and the flange, and the bolt head of each bolt is inserted. A configuration is known in which nuts are respectively tightened on the bolts in a state of being in contact with the rotation preventing portion, and a plurality of plowing pawls are radially provided on the flange.

[0003]

In the structure described in the above publication, when the nut is tightened and rotated on the bolt, the nut is stopped while the head of the bolt abuts against the rotation preventing portion of the washer plate and is prevented from rotating. Since it is tightened, it does not require a rotation stop operation to press the bolt head on the side opposite to this nut, but at the beginning of the nut tightening operation, insert two bolts into the washer plate one by one. Since the nut has a shallow screw engagement and the bolt can move forward and backward with respect to the washer plate and can rotate freely, the bolt head is easily disengaged from the rotation block and the length of the bolt is long. Depending on the bolt, the bolt may rotate idle.Therefore, it is necessary to press and hold the bolt head in contact with the rotation prevention part until the nut is tightened to some extent. The same operation may be required when removing the lock, and the rotation blocking part may be formed by bending the washer plate or curved in an arc shape, or may be a separate rotation blocking part on the washer plate. However, there is a problem that the structure of the washer plate for fixing the sheet is likely to be complicated.

The present invention has been made in view of the above points, and it is possible to securely fix a bolt to a washer body with a simple structure, to easily attach and detach a tilling pawl, and to attach a nut to the bolt. An object of the present invention is to provide a tilling pawl mounting device that does not require a detent operation to press the bolt head on the opposite side and can reduce the work of attaching and detaching the tilling pawl.

[0005]

According to another aspect of the present invention, there is provided a tillage claw attaching device, wherein a tillage shaft, a flange fixed to the tillage shaft, and a radial attachment to the flange around the tiller shaft. A plurality of tillage claws, two bolts for fixing the plurality of tillage claws to the flange through the washers, and a nut screwed to the two bolts. , Has a pressing plate that abuts on the base end of each of the tilling claws, and inserts through holes through which the two bolts are inserted, on both sides of the pressing plate, and the two bolts are A bolt shaft that is inserted into the insertion hole of the pressing plate; and a large-diameter bolt head that is integrally formed at one end of the bolt shaft and that abuts the opening edge of the insertion hole of the pressing plate, At one end of the bolt shaft near the bolt head, The pressing plate has a knurled shaft portion formed with an axial knurl that protrudes slightly larger than the inner diameter of the insertion hole, and the knurled shaft portions of the two bolts are respectively inserted into the insertion holes on both sides of the pressing plate. Two bolts are integrally fixed to both sides of the washer by press-fitting and crimping from the axial direction.

The base end of each plowing pawl is provided for each pawl mounting portion of the flange, and both side portions of the washer are arranged from the base end of each plowing pawl to each pawl mounting portion of the flange. By inserting the two bolts fixed to each other, the pressing plate of the washer having the two bolts is brought into contact with the base end portions of the respective tillage claws.

Further, nuts are respectively screwed into and tightened on two bolts protruding outward of the flange on the side opposite to the washer body, so that the pressing plates of the respective washer bodies respectively cultivate each. The base end portion of the pawl is pressed toward the flange side, and the base end portion of each plowing pawl is clamped and clamped between the pressing plate and the flange. And a plurality of tillage nails are radially attached to the flange.

In this case, the knurled shaft portions of the two bolts are press-fitted and crimped in the axial direction into the insertion holes on both sides of the pressing plate to integrally prevent rotation, so that the nuts are attached to the two bolts. Even if they are tightened strongly, the two bolts do not rotate, and it is not necessary to press the heads of the bolts. The nuts are strongly tightened to the two bolts, and the base end of each tiller claw is tightened. Each part is easily clamped and fixed.

Further, since each bolt has a bolt head that abuts the opening edge of the insertion hole on both sides of the pressing plate,
When the knurled shaft portion of each bolt is press-fitted and crimped from the axial direction into the insertion holes on both sides, the bolt head securely prevents the knurled shaft portion from slipping off. Are fixed in place.

According to a second aspect of the present invention, there is provided a tiller mounting device according to the first aspect, wherein the insertion hole of the pressing plate is
It has an annular tightening portion in which an opening edge portion on the side opposite to the bolt insertion direction is caulked to the knurled shaft portion of the bolt inserted into the insertion hole.

Then, the knurled shaft portion of the bolt is more firmly fixed to the insertion hole of the pressing plate by the annular tightening portion.

According to a third aspect of the invention, there is provided a tillage claw mounting device according to the first or second aspect, wherein the pressing plate is
A display portion for displaying the size of the bolt and the like is provided on the surface portion located between the insertion holes on both sides.

Then, the bolt size and the like are confirmed on the display portion, and the size of the flange and each of the plowing pawls is 2
A washer with a bolt of books is optionally used.

[0014]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 denotes a machine frame of an agricultural machine. The machine frame 1 is a main frame 2 in the left-right direction, a transmission case 3 and a bracket (not shown) which are arranged and fixed facing both ends of the main frame 2. ) And have. Further, a transmission 5 is provided at an intermediate portion of the main frame 2 so as to rotatably project the input shaft 4 forward.

Left and right lower arms 6 are integrally projecting from both sides of the main frame 2 toward the lower front, and left and right lower pins 7 are projectingly provided at the tips of the left and right lower arms 6, respectively. ing. Also, the mission 5
A mast 8 is integrally provided on the upper part of the front of the mast,
A connection hole 9 is formed at the tip of the mast 8, and the mast 8 and the left and right lower arms 6 are connected by a stay 10.

Reference numeral 11 denotes a rotary working body 11 rotatably mounted between the lower ends of the transmission case 3 and the bracket.
The rotary work body 11 has a cultivating shaft 12 rotatably mounted between the lower ends of the transmission case 3 and the bracket, and the cultivating shaft 12 has a predetermined interval in the axial direction. A large number of disc-shaped flanges 13 are integrally fixed.

Plural sets of pawl mounting holes 15 are formed on each of the flanges 13 so that a plurality of pawls 14 for radially mounting the plurality of plowing pawls 14 around the cultivating shaft 12 are formed as a set, and the pawl mounting holes 15 are spaced apart from each other inside and outside. ing. The plurality of tillage claws 14 each have a plate-shaped base end portion 16 that abuts each of the flanges 13, and the base end portion 16 has a pair of pawl mounting holes for the two flanges 13.
15 has two communicating holes 17 communicating with each other, and the base end 16 has a vertical cutting edge 18 extending continuously and a lateral cutting edge 19 curved at the tip.

Reference numeral 20 is a base end portion 16 of the plurality of tilling claws 14.
Is a fastener that detachably attaches to the flange 13. The fastener 20 includes a metal washer body 21, two metal bolts 22 to be attached to the washer body 21, and two bolts 22.
And a nut 24 made of metal, which is detachably screwed through a washer 23.

The washer 21 is a base end portion of each of the plowing claws 14.
It has an elongated pushing plate 25 that abuts along 16 and this pushing plate
Insertion holes 26 through which the two bolts 22 are respectively inserted are formed on both side portions in the length direction of 25, and the insertion holes 26 on both side portions are formed.
Are communicated with the communication holes 17 of the base end portion 16 of each of the plowing claws 14, respectively.

The two bolts 22 are a bolt shaft 27 which is inserted into the insertion holes 26 on both sides of the pressing plate 25, and the bolt shaft 27.
It has a large-diameter bolt head 29 that is integrally formed at one end of the pressing plate 27 and abuts on the opening edge parts 28 of the insertion holes 26 on both sides of the pressing plate 25. Further, at one end of the bolt shaft 27 close to the bolt head 29, an axial direction of the bolt shaft 27 that projects slightly larger than the inner diameters of the insertion holes 26 on both sides of the pressing plate 25 on the outer periphery of the bolt shaft 27. Knurled shaft 31 forming the knurled part 31
have. The other end of the bolt shaft 27 has a screw shaft portion 32 to which the nut 24 is screwed.

Then, the bolt shaft of the two bolts 22
The screw shaft portion 27 and the screw shaft portion 32 have an outer diameter slightly smaller than the inner diameter of the insertion hole 26 on both sides of the pressing plate 25, and are formed so that they can be smoothly inserted into the insertion hole 26. It is formed with an outer diameter that can be press-fitted in the insertion holes 26 on both sides of the contact plate 25 from the axial direction. Further, the bolt head 29 is formed in a polygonal shape with a size capable of preventing the bolt shaft 27 from coming off from the insertion holes 26 on both sides of the pressing plate 25.

Next, the two bolts are attached to the washer body 21.
When connecting 22, the insertion holes on both sides of the pushing plate 25
The two bolts 22 are inserted into the 26 from the screw shaft portions 32, and the knurled shaft portions 31 of the two bolts 22 are forcibly press-fitted in the axial direction, so that the insertion holes 26 on both sides are inserted. The knurled shaft portions 31 of the two bolts 22 or one of them is plastically deformed and pressure-bonded to each other to form the washer body 21.
Two bolts 22 are integrally fixed to both side portions of each.

The two bolts 22 are fixed to both sides of the washer body 21 so as not to rotate and to prevent the bolts from coming off. The bolt heads 29 of the two bolts 22 are located on both sides. By abutting on the opening edge portions 28 of the insertion holes 26, the two bolts 22 are more reliably retained and supported by the bolt heads 29.

Further, the knurled shaft portions 31 of the two bolts 22 are forcibly inserted into the insertion holes 26 on both sides of the pressing plate 25, so that the two bolts 22 are inserted (press-in).
When the opening edge portions 28 of the insertion holes 26 on both sides are deformed on the opposite side to the direction, the screw shaft portions 32 of the two bolts 22 are separated from the opening edge portions 28 of the insertion holes 26 on both side portions. The jig 33 is inserted along the bolt shaft 27, and the opening edge portions 28 of the insertion holes 26 on both sides are pushed back by the annular pressing portion 34 protruding from the tip end of the jig 33. 28 is crimped onto the knurled shaft portion 31 as an annular fastening portion 35.

The annular tightening portions 35 of the through holes 26 on both sides and the knurled shaft portions 31 of the two bolts 22 are more securely crimped to each other, and the two bolts 22 are provided on both sides of the washer body 21. Is fixed integrally so that it cannot be rotated and cannot be prevented from coming off.

Next, on the surface of the pressing plate 25 of the washer body 21, the length of the two bolts 22 located between the insertion holes 26 on both sides, the length of the two bolts 22, A display portion 36 is formed to display the pitch of the screw shaft portion 32, the distance between the two bolts 22, the size of the two bolts 22, and the like.

That is, depending on the model of the rotary work body 11 and the plowing claws 14, the lengths and intervals of the bolts 22 for attaching the plowing claws 14 to the flange 13 are different. Therefore, various bolts 22 are provided to cope with these differences. Although prepared, two bolts 22 as a set are fixed to both sides of the pushing plate 25, and the size of the two bolts 22 is displayed on the display portion 36 of the pushing plate 25, whereby The fastener 20 can be easily selected according to the model of the working body 11 and the tiller 14. Therefore, the work of attaching the tiller 14 becomes easy.

Next, between the transmission case 3 and the bracket, a rotary cover 37 covering the upper part of the rotary work body 11 is fixed. Further, at the rear end of the rotary cover 37, a leveling body 38 located at a rear portion of the rotary work body 11 for leveling the tilled soil cultivated by the rotary work body 11 is vertically rotatable. The grounded body 38 is axially supported and is supported by a support rod 39 protruding rearward from the main frame 2 so that the position thereof can be adjusted in the vertical direction.

Next, the operation of the above embodiment will be described.

The base end portions 16 of the respective plowing pawls 14 are disposed in a plurality of sets of pawl mounting holes 15 each including two flanges 13, and both sides of the base end portions 16 of the respective plowing pawls 14 are arranged. From the communication hole 17 of the section to the respective claw mounting holes 15 of the flange 13
By inserting the two bolts 22 on both sides of the washer body 21 of the fastener 20 selected according to the above, the pressing plate 25 of the washer body 21 having the two bolts 22 is inserted into each plowing claw. The base end portion 16 of 14 is abutted.

Further, nuts 24 are respectively screwed into and tightened on the screw shaft portions 32 of the two bolts 22 protruding outward of the flange 13 on the side opposite to the washer body 21, so that the respective washer bodies are tightened. 21 pushing plates 25 at the base end of each tiller 14
16 is pressed toward the flange 13 side, and the base end portions 16 of the tilling claws 14 are clamped and clamped between the pressing plates 25 and the flange 13.

Also, a plurality of fasteners for each flange 13
In the same manner as described above using 20, the base end portions 16 of the plurality of tillers 14 are
By tightening each, the base end of each tiller 14
16 is clamped and clamped between each flange 13 and the washer body 21 of each fastener 20. Then, a plurality of plowing claws 14 are radially fixed to each flange 13.

In this case, the knurled shaft portions 31 of the two bolts 22 are press-fitted and pressed into the insertion holes 26 on both sides of the pressing plate 25 from the axial direction, and are rotated integrally by the annular fastening portion 35. The two bolts 22 of the pushing plate 25 are fixed from the communicating holes 17 on both sides of the base end 16 of each plowing claw 14 to the flanges.
It is inserted into each claw mounting hole 15 of 13 at the same time.

Even if the nuts 24 are strongly tightened to the two bolts 22, the two bolts 22 do not rotate and it is not necessary to press the bolt heads 29. The nuts (24) are strongly tightened to the bolts (22), and the base ends (16) of the respective tillage claws (14) are easily tightened and clamped and fixed.

Further, each bolt 22 has a bolt head 29 which abuts the opening edge portion 28 of the insertion hole 26 on both sides of the pressing plate 25, so that the knurls of each bolt 22 are inserted into the insertion holes 26 on both sides. When the shaft portion 31 is press-fitted and crimped from the axial direction, the bolt head portion 29 securely prevents the shaft portion 31 from coming off and the knurled shaft portion 31 of each bolt 22 is placed in a predetermined position in the insertion holes 26 on both sides. Fixed.

In this way, each flange 13 of the tiller shaft 12 is
When a large number of plowing pawls 14 are fixed to each of the plurality of plowing pawls 14, two bolts 22 for fixing the plowing pawls 14 can be simultaneously attached to the flange 13 from the base end portion 16 of each plowing pawl 14 as a set. There is no need to install one by one, so each flange
A plurality of tillers 14 are securely attached to 13 by a simple operation.

Next, in the above embodiment, the case where the bolt heads 29 of the two bolts 22 are formed in a polygonal shape has been described, but the present invention is not limited to this, and the bolt heads 29 of the two bolts 22 are It may be formed in a circular shape. That is,
In the two bolts 22, the knurled shaft portion 31 has an insertion hole for the washer body 21.
Since it is integrally fixed to 26, it is not necessary to press the bolt head 29 with a spanner or the like to stop the two bolts 22 when tightening the nut 24 to the two bolts 22. It is sufficient that the bolt head 29 of the book bolt 22 has a larger diameter than the insertion hole 26 of the washer body 21 and is prevented from coming off, and may be formed in a circular shape.

[0039]

According to the first aspect of the present invention, the washer body is provided with insertion holes through which two bolts are respectively inserted on both sides of the pressing plate which abuts on the base end of each tilling claw. For the two bolts, one end of a bolt shaft that is inserted into the insertion hole of the pressing plate is close to the head of the bolt, and protrudes slightly larger than the inner diameter of the insertion hole of the pressing plate on the outer periphery of the bolt shaft. A knurled shaft portion having axial knurls is formed, and the knurled shaft portions of the two bolts are press-fitted in the insertion holes on both sides of the pressing plate from the axial direction to press the knurled shaft portions on both sides of the washer.
Since the two bolts are fixed together, the two bolts can be reliably fixed together with the washer body with a simple structure, and the operation of attaching and removing the tillage claws is easy. It does not require a detent operation to hold the bolt head on the side opposite to the nut that is tightened to two bolts at the time of attachment / detachment operation, reduces the work of attaching / detaching the plowing pawl, and attaches multiple plowing pawls to the flange as a whole. The workability can be greatly improved.

According to the second aspect of the present invention, the insertion hole of the pressing plate is an annular tightening portion in which the opening edge portion on the side opposite to the insertion direction of the bolt is caulked to the knurled shaft portion of the bolt inserted into the insertion hole. Since it has this, the knurled shaft portion of the bolt can be more firmly and integrally fixed to the insertion hole of the pressing plate by this annular tightening portion.

According to the third aspect of the present invention, the pressing plate has the display portion for displaying the size of the bolt on the surface portion located between the insertion holes on both sides, so that the surface portion of the pressing plate is utilized. The size of the bolt can be displayed, and by displaying the size of this bolt, it is possible to easily select and use the bolt according to the tilling claw attached to the flange at a glance, simplifying the work of attaching the tilling claw. it can.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a tillage claw attaching device showing an embodiment of the present invention.

FIG. 2 is a side view of the same fastener.

3 is a cross-sectional view taken along line aa of FIG.

FIG. 4 is an exploded side view of a part of the same fastener.

FIG. 5 is a sectional view showing a caulked state of the same bolt.

FIG. 6 is a front view of the same fastener.

FIG. 7 is a side view of an agricultural working machine including the same rotary working body as above.

FIG. 8 is a front view of a fastener showing another embodiment.

[Explanation of symbols]

 12 Tilling shaft 13 Flange 14 Tilling claw 16 Base end 21 Washer 22 Bolt 24 Nut 25 Pushing plate 26 Insertion hole 27 Bolt shaft 28 Opening edge 29 Bolt head 30 Knurl 31 Knurled shaft 35 Annular tightening 36 Display Department

Claims (3)

[Claims] 1. A tilling shaft, a flange fixed to the tilling shaft, a plurality of tilling claws radially attached to the flange around the tilling shaft, and each of the plurality of tilling claws. Secured to the flange via a washer 2
Bolts and nuts screwed to these two bolts,
The washer body has a pressing plate that abuts on the base end of each of the tilling claws, and the insertion holes through which the two bolts are inserted are opened on both side parts of the pressing plate, The two bolts are a bolt shaft that is inserted into the insertion hole of the pressing plate, and a large-diameter bolt that is integrally formed at one end of the bolt shaft and that abuts the opening edge of the insertion hole of the pressing plate. A head portion, and an knurl in the axial direction is formed at one end of the bolt shaft near the head portion of the bolt, the knurl extending slightly larger than the inner diameter of the insertion hole of the pressing plate on the outer periphery of the bolt shaft. The knurled shafts are formed by pressing the knurled shafts of the two bolts into the insertion holes on both sides of the pressing plate from the axial direction to integrally integrate the two bolts on both sides of the washer. A cultivating claw attachment device characterized by being fixed to the. 2. The insertion hole of the pressing plate has an annular tightening portion in which the opening edge portion on the side opposite to the insertion direction of the bolt is caulked to the knurled shaft portion of the bolt inserted into the insertion hole. The tillage claw attachment device according to claim 1. 3. The tillage claw attachment device according to claim 1, wherein the pressing plate has a display portion for displaying the size of the bolt and the like on the surface portion located between the insertion holes on both sides. .