JPH0610725Y2 - Plow mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a tiller attachment device, and in a rotary tiller, a large number of tillers are radially arranged at intervals on the circumferential side portion of the tiller shaft in the axial direction. Concerning what is projected.

(Prior Art) Conventionally, as this type of tillage claw attaching device, for example, a large number of flanges are fixed at intervals in the axial direction of the tiller shaft,
A large number of circular mounting holes that communicate with each other are formed in the mounting portions of each of the flanges and the plurality of tillage nails that are radially attached to each of the flanges. Insert each bolt,
A structure in which a nut is fastened to each bolt is adopted.

(Problems to be solved by the invention) In the above-mentioned structure, since the mounting holes for the flanges and the plowing pawls through which the bolts are inserted are formed in a circular shape, the bolts inserted therethrough freely rotate within the mounting holes. Therefore, when tightening the nut, it is necessary to rotate the nut by the right hand jig while fixing the bolt head by the fixing means, that is, while holding the bolt head by the left hand jig, for example. Therefore, it requires a lot of labor and labor for the factory production of assembling a large number of tillers on each flange,
In addition, it takes a lot of time to replace the plowing claws when the plowing claws are worn or damaged due to use.Furthermore, when the nuts are fastened to the bolts, the bolt heads and the nuts are used as the plowing claws. Since the flange is clamped, there is a problem in that it is not preferable in order to strengthen the holding force of the tilling claw and prevent backlash.

Therefore, the present invention has been made in view of such a point, and the bolt can be securely stopped by inserting the bolt into the base end portion of the flange or the plowing pawl. On the other hand, the nut can be easily tightened, the labor and labor of factory production for assembling a large number of tillers on each flange can be greatly reduced, and when the tillers are worn or damaged. A tilling claw mounting device that can easily remove and replace the tilling claw, and strengthens the retaining force of the tilling claw when the nut is fastened to the bolt and reliably prevents backlash. It is intended to be provided.

(Means for Solving Problems) A tillage claw attaching device of the present invention includes a main frame, a chain case and a bracket fixed to opposite ends of the main frame, and a lower end of the chain case and the bracket. And a rotary work body rotatably provided between the rotary work body and the rotary work body. The rotary work body includes a plurality of flanges rotatably provided between the lower ends of the chain case and the bracket and fixed at intervals in the axial direction. The cultivating shaft having, a plurality of cultivating claws radially attached to each flange of the cultivating shaft, a plurality of bolts for attaching the plurality of cultivating claws to the respective flanges, and screwing to the respective bolts. And a taper having a diameter reduced toward the inserting direction of each bolt at either one of the mounting position of each plowing pawl of each flange or the base end portion of each plowing pawl. A par-shaped, non-rotating variant insertion hole is formed, a communication hole communicating with the variant insertion hole is formed on the other side, and the variant insertion hole is inserted into the neck portions of the plurality of bolts. It is a tapered shape that can be fitted together and has a deformed locking portion for preventing rotation.

(Function) In the tiller attachment device of the present invention, when the bolt is inserted through the flange and the base end of the tiller, the bolt is formed in the neck of the bolt in the tapered irregular insertion hole formed in one of them. The tapered odd-shaped locking portion is inserted and fitted, and the rotation of the bolt is locked and prevented from rotating by the mutual odd-shaped insertion hole and the odd-shaped locking portion. Then, the nut of the bolt of the bolt or the threaded portion projecting outward of the tilling nail is screwed and fastened, whereby the base end portion of the tilling nail is securely fixed to the flange.

At this time, that is, when the nut is screwed and fastened to the bolt, the irregular engagement portion is fitted in the irregular insertion hole.
The nut can be easily fastened to the bolt without fixing and supporting the bolt on the one hand. Also, by sequentially tightening the nuts on the bolts, the taper part of the deformed locking part of the bolt is sequentially strongly fitted to the taper part of the deformed insertion hole of the flange or the tilling claw, and the The proximal ends of the tillage claws are strongly bonded. Therefore, the cultivating pawl can be easily fixed by the turning operation of only the nut, and the base ends of the cultivating pawls are loosely attached to the flange due to the mutual taper connection, and are firmly connected without backlash.

In this way, a large number of tillers can be easily and radially attached to each flange by simply connecting and connecting the base end portions of a plurality of tillers to each flange with a set of bolts and nuts. can do.

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

1 to 5, reference numeral 1 denotes a main frame, and the main frame 1
A mission 3 is provided at an intermediate portion of the so as to project the input shaft 2 forward. A chain case 4 and an upper portion of a bracket (not shown) are fixed to the left and right ends of the main frame 1 so as to face each other, and a rotary working body 5 rotates between the chain case 4 and the lower end portion of the bracket. The rotary work body 5 is freely installed, and the rotary work body 5 is the mission 3
It is adapted to be rotationally driven through an output from the output shaft 6 and a chain (not shown) in the chain case 4 which transmits this output.

The rotary working body 5 is a cultivating shaft 7 rotatably mounted between the lower ends of the chain case 4 and the bracket.
A large number of disc-shaped flanges 8 are fixed at predetermined intervals in the axial direction of the cultivating shaft 7, and a plurality of cultivating claws 9 are provided on the peripheral side of each of the flanges 8 with bolts 13. The nuts 16 project radially.

Then, in each of the flanges 8, each of the plowing claws 9
At the inner and outer mounting positions where the
As shown in FIGS. 4 and 5, each inner portion and each outer portion is provided with a predetermined mounting interval, and has a taper shape in which the diameter is reduced in the insertion direction of the bolt 13 and is for preventing rotation. For example, the odd-shaped insertion holes 10, 10 are formed as a set of a pair having a shape different from a circle, such as a semicircular shape, an angular shape, and an elliptical shape.

Further, each of the plowing claws 9 is formed at its base end portion 11 with communication holes 12 and 12 which communicate with the pair of variant insertion holes 10 and 10 in each set of the flanges 8.

Then, from each of the variant insertion holes 10 and 10 to the communication holes 12 and 12,
The bolts 13, 13 are inserted into the bolts 13, 13 and the nuts 16, 16 are fastened to the screw shaft portions 14, 14 of the bolts 13, 13 projecting outward from the plowing claws 9 via washers 15, 15. However, as shown in FIGS. 4 and 5, each of the bolts 13, 13 has a neck portion 18 between the inner end portion of the screw shaft portion 14, 14 and the large-diameter head portion 17, 17. , 18
At this, there is formed a deformed locking portion 19, 19 for preventing rotation, which is tapered so that it can be inserted into and fitted into the deformed insertion holes 10, 10.

In the figure, 20 is a cover body covering the upper part of the rotary working body 5, 21 is a flat plate, 22 is a gauge wheel, and 23 is a connecting frame for connecting to the tractor.

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

When a plurality of plowing pawls 9 of each flange 8 are radially attached, the base end portions 11 of the plowing pawls 9 are overlapped with the mounting positions of the plowing pawls of the flange 8 to form the variant insertion holes of the flange 8. Insert the screw shaft portions 14 and 14 of the bolts 13 and 13 into the communication holes 12 and 12 of the base end portion 11 of the tiller claw 9 from 10 and 10, and fix the deformed locking portions 19 and 19 of the bolts 13 and 13 to the flange. Bolts 13 and 13 which are inserted into the odd-shaped insertion holes 10 and 10 of
The nuts 16, 16 are fastened to the screw shaft portions 14, 14 via washers 15, 15.

In this case, that is, when tightening the nuts 16 and 16 to the screw shaft portions 14 and 14 of the bolts 13 and 13,
Since the odd-shaped locking portions 19 and 19 of 13 are inserted and fitted into the odd-shaped insertion holes 10 and 10, the rotation of the bolts 13 and 13 is locked and prevented from rotating. Without fixing the large-diameter heads 17, 17 of
The nuts 16 and 16 can be easily fastened simply by rotating the nuts 16 and 16 with respect to the screw shaft portions 14 and 14 of the bolts 13 and 13 on one side, and the base of the tiller claw 9 can be attached to the flange 8. The end portion 11 is securely fixed.

Further, by sequentially tightening the nuts 16 and 16 to the bolts 13 and 13, the taper portions of the deformed engaging portions 19 and 19 of the bolts 13 and 13 are tapered with respect to the taper portions of the deformed insertion holes 10 and 10 of the flange 8. The parts are sequentially strongly fitted together, and the base end 11 of the tilling claw 9 is strongly joined to the flange 8. Therefore, the plowing claw 9 is easily fixed by rotating only the nuts 16 and 16, and the irregular insertion holes 10 and 10 and the irregular locking portions 19 and 19 are mutually taperingly coupled to the flange 8. Nail 9
The base end portion 11 of is loosely coupled and strongly joined without backlash.

In this way, the base end portions 11 of the plowing claws 9 are overlapped with the respective flanges 8, and the deformed insertion holes 10 and 10 and the communication holes 12 and 12 that communicate with each other are formed into a set of bolts 13, 13
-By connecting with the nuts 16 and 16, a large number of tillers 9 can be easily and surely radially attached to each flange 8.

Next, in the above-described embodiment, the description has been given of the case where the tapered irregular insertion holes 10, 10 for preventing the bolts 13, 13 from turning are formed in the flange 8, but the present invention is not limited to this, and FIGS. As shown in FIG. 5, the variant insertion holes 24, 24 may be formed in front of and behind the base end portion 11 of each tillage claw 9. In this case, each of the cultivating pawl mounting devices of each flange 8 has a communicating hole 25, which communicates with the tapered irregular insertion hole 24, 24 of the cultivating pawl 9.
To form 25.

Then, as in the case of the above-described embodiment, the tapered irregular insertion holes 24, 24 of each plowing claw 9 to the communication holes 25, 25 of the flange 8 are formed.
While inserting the screw shaft portions 14 and 14 of the bolts 13 and 13, into the deformed engaging portions 19 and 19 of the bolts 13 and 13 into the deformed insertion holes 24 and 24 of the tillage claw 9 and fitting, Nuts 16 and 16 are fastened to the screw shaft portions 14 and 14 of the bolts 13 and 13 protruding outward of the flange 8 via washers 15 and 15, respectively.

In this case, that is, when tightening the nuts 16 and 16 to the screw shaft portions 14 and 14 of the bolts 13 and 13,
Since the tapered deformed locking portions 19 and 19 of 13 are inserted and fitted into the tapered deformed insertion holes 24 and 24 of the tilling claw 9, the bolts 13 and 13 are locked in advance and prevented from rotating. And therefore the large diameter head 17, of the bolt 13,13
The nuts 16 and 16 can be easily tightened simply by rotating the nuts 16 and 16 with respect to the screw shaft portions 14 and 14 of the bolts 13 and 13 on one side without fixing the 17 to the fixing means.

Further, by sequentially tightening the nuts 16 and 16 to the bolts 13 and 13, the deformed locking portions 19 and 19 of the bolts 13 and 13 are fitted to the tapered portions of the deformed insertion holes 24 and 24 of the tilling claw 9. The taper portions are successively strongly fitted together, and the base end portion 11 of the tilling claw 9 is strongly joined to the flange 8. Therefore, the nut
The plowing claw 9 is easily fixed by rotating 16 and 16 only, and the tapered insertion holes 24, 24 and the irregular locking parts 19, 19 are mutually taperingly coupled to the flange 8 so that the plowing claw 9 is fixed. The base end portion 11 is loosely coupled and strongly joined without causing play.

[Effect of device]

According to the present invention, a tapered irregular insertion hole is formed on either one of the flange or the base end portion of the tilling claw, and a communication hole communicating with the irregular insertion hole is formed on the other end, and the flange is formed on the flange. The neck of the bolt that connects the plowing pawl has a taper-shaped deformed locking portion that can be inserted and fitted into the deformed insertion hole, so that the deformed shape of the bolt is different from that of the flange or the deformed insertion hole of the plowing pawl. By inserting and engaging the locking part, the bolt can be easily and reliably prevented from rotating, and therefore the nut can be tightened easily and securely without fixing and supporting the head of the bolt. Therefore, many plowing pawls can be easily and reliably attached to each flange, greatly reducing the labor and labor of factory production for assembling a large number of plowing pawls to the flange. Can Further, at the time of wear damage tilling claws can be attached and detached replacement of the tilling claws easily.

In addition, when tightening the nut to the bolt, taper gradually with the tapered deformed locking part of the neck of the bolt fitted into the tapered deformed insertion hole of the flange or tiller. It is possible to connect them, and therefore the plowing claw can be fixed to the flange with a high holding force, and it is possible to reliably prevent rattling of the plowing claw.

Therefore, it is possible to provide a tilling claw attaching device that is easy to handle and that can securely hold the tilling claw against the flange even if soil pressure is applied.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a side view of a rotary working machine equipped with a tilling claw mounting device, FIG. 2 is a plan view of a part of the same as above, in which the tilling claw is mounted, and FIG. Fig. 4 is an enlarged plan view of a part of the same as above, Fig. 4 is a sectional view of the same as above, Fig. 5 is an exploded perspective view of the same as above, and Fig. 6 is a plan view of a part of a tillage claw attaching device showing another embodiment. Is a sectional view of the same as above, and FIG. 8 is an exploded perspective view of the same as above. 1 ... Main frame, 4 ... Chain case, 5 ... Rotary work, 7 ... Tilling shaft, 8 ... Flange, 9 ... Tilling pawl, 10,24 ... Variable insertion hole, 11 ... Base end Part, 12, 25 ... communicating hole, 13 ... bolt, 16 ... nut, 18 ... neck part, 19 ...
… Deformed locking part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 52-23903 (JP, U) Steady opening 53-107502 (JP, U) Steady opening Sho 56-100102 (JP, U) Japanese Patent Sho 58- 43041 (JP, B2) Actual public Sho 48-36885 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A main frame, a chain case and a bracket fixed to opposite ends of the main frame, and a rotary work body rotatably provided between lower ends of the chain case and the bracket. However, the rotary work body is rotatably provided between the lower ends of the chain case and the bracket, and has a cultivating shaft having a large number of flanges fixed at intervals in the axial direction, and with respect to each flange of the cultivating shaft. A plurality of tilling claws that are radially attached, and a plurality of bolts that attach the plurality of tilling claws to the respective flanges and nuts that are screwed to the respective bolts, and the respective tiller claws of the respective flanges. At either one of the mounting position or the base end portion of each of the plowing pawls, a tapered shape having a diameter reduced toward the inserting direction of each of the bolts and a variant insertion hole for preventing rotation are formed. On the other side, a communication hole that communicates with the odd-shaped insertion hole is formed, and the neck portion of the plurality of bolts has a taper shape that can be fitted into the odd-shaped insertion hole by fitting through the odd-shaped insertion hole A tilling claw attachment device characterized in that a locking portion is formed.