JP4588488B2 - Tillage claw fastening device - Google Patents

Description

  The present invention relates to a tillage claw fastening device for attaching a tillage nail to a tillage shaft of a tillage rotary that plows a field.

  Conventionally, as a structure for attaching a cultivation claw to a cultivation shaft of a cultivation rotary that cultivates a field, a pair of claw attachment holes provided on a flange fixed to a cultivation shaft from a pair of communication holes provided on a base of the cultivation claw A structure is known in which a bolt is inserted through and screwed into a nut to fix the base of a tilling nail to a flange.

  According to this tillage claw attachment structure, in order to attach the tillage claw to the flange, each of the two bolts is inserted into the pair of communication holes provided in the base of the tillage claw and the pair of claws provided on the flange Insert through the mounting hole. Then, a nut is screwed onto the bolt protruding from the flange, and the tilling claw is tightened through the flange. During the screwing operation of the nut, it is necessary to press the bolt head so that the bolt does not rotate together with the nut, and the workability of attaching the tilling claw is poor.

  What improved such an inconvenience is a tillage nail attachment device described in Patent Document 1. As shown in FIG. 4A (side view), the tillage claw attachment device 60 includes a washer body 61 having insertion holes 62 on both sides, and two bolts 65 attached to the insertion holes 62. It has. A knurled shaft portion 66 a having a knurled shape is provided at the base end side end of the bolt shaft 66 of the bolt 65, and the knurled shaft portion 66 a is slightly larger in diameter than the inner diameter of the insertion hole 62. For this reason, the knurled shaft portion 66a is press-fitted into and inserted into the insertion hole 62. As a result, the two bolts 65 are integrally fixed to the washer body 61. For this reason, as shown in FIG. 4B (cross-sectional view), a bolt 65 is connected to a pair of claw mounting holes 82 provided in the flange 81 from a pair of communication holes 87 provided in the base of the tilling claw 85. Even if the nut 40 is screwed and tightened, the bolt 65 does not rotate and there is no need to hold down each bolt head 67, and the nut 40 is fastened to the respective bolt to cultivate the tilling claw 85. It can be fixed to the flange 81.

Japanese Patent No. 3247835

  The bolt of the tillage claw mounting device described in Patent Document 1 is provided with a knurled shaft portion on the base end side of the bolt shaft, and is a dedicated product, and a commercially available product cannot be used as it is. For this reason, there exists a problem that cost is high. The bolt and the washer body are integrated via the knurled shaft part, but when the knurled eye formed on the outer periphery of the knurled shaft part is press-fitted into the insertion hole of the washer body, a part of the knurled eye is There is a risk of plastic deformation and fracture. Therefore, the conventional tillage claw attaching device has a problem that the coupling strength between the bolt and the washer body may be weak, and the reliability with respect to the detent function of the bolt is low.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a tillage claw fastening device that is low in cost and highly reliable with respect to a bolt detent function.

In order to achieve the above object, a tillage claw fastening device of the present invention is a tillage claw fastening device for attaching a tillage claw to a flange provided on a tillage shaft, and is provided with a flange from a pair of communication holes provided at a base of the tillage claw. with two and hex bolt to secure the base of the nut and screwed with tilling claws to the flange are inserted into a pair of the pawl mounting holes provided, and a washer plate which inserted the two hex bolts , the seat gold plate leads continuously on one side between the pair of side surfaces and these aspects including an insertion hole and opposite sides of the hexagonal bolt head of the hexagonal bolt inserted through the bolt shank of the hexagonal bolt on both sides A bolt rotation restricting portion that extends along two side surfaces and extends from the seating surface side of the bolt head to the front side of the top surface. The bolt shaft portion of the hexagonal bolt is inserted into the insertion hole of the washer plate. A bolt head is placed inside the rotation restricting section And restricting the rotation of the bolt insertion hole is provided with a cylindrical portion which the bolt rotation restricting portion is burring extends to disposed the side opposite, it surrounds the base side of the bolt shaft portion extending from the insertion hole cylinder A tillage claw fastening device characterized in that the movement of the hexagon bolt relative to the washer plate in the axial direction is restricted by crimping the shape portion.

According to this invention, the hexagon bolt is restricted from turning by the bolt turning restricting portion extending from the seat surface side of the bolt head to the front side of the top surface , and the bolt shaft portion is a tube formed in the insertion hole. By caulking by the shape portion, the rotation of the hexagon bolt with respect to the washer plate is restricted, and the movement in the bolt axial direction is restricted. For this reason, when tightening a nut, it is not necessary to hold down a bolt head and to restrict movement of the hexagon bolt in the axial direction and rotation of the hexagon bolt. As a result, the reliability of the hexagon bolt detent function by the bolt rotation restricting part can always be made high, improving the workability of fixing the tilling claw to the flange and removing the tilling claw from the flange. Can be made. Moreover, since a hexagon bolt can use a commercial item and a washer board is formed by the bending process etc. of a sheet metal, the cost of a tilling nail fastening apparatus can be made cheap. Also, the bolt shaft part is caulked by a cylindrical part formed in the insertion hole, so that the integrity of the hexagon bolt and the washer plate is improved, and the workability of the insertion work to the flange of the tillage claw fastening device is improved. Can be made. Moreover, since the side surface on the top surface side of the bolt head is exposed, a tool such as a spanner or a spectacle wrench can be used. As a result, there is no need to restrict the movement of the hexagon bolt in the axial direction or the rotation of the hexagon bolt by pressing the bolt head when tightening the nut, and it has a tillage shaft for exchanging tillage claws. When it is easier to work in the state where the tilling rotor is free, by engaging a spanner or the like with the bolt head, the rotation of the tilling rotor can be regulated to easily attach and detach the tilling claw. .

According to the tillage claw fastening device of the present invention, the rotation of the hexagon bolt is restricted by the bolt rotation restricting portion, and the insertion hole is burring and extends to the side opposite to the side where the bolt turning restricting portion is disposed. By controlling the movement of the hexagon bolt in the axial direction relative to the washer plate by caulking the cylindrical portion that includes the cylindrical portion and surrounds the base side of the bolt shaft portion extending from the insertion hole, the cost is low, It is possible to provide a tillage claw fastening device with high reliability for the detent function of the hexagon bolt.

  Hereinafter, a tilling claw fastening device according to the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the tilling claw fastening device 1 is for attaching a tilling claw 85 to a flange 81 provided on a tilling shaft 80, and a pair of communication holes 87 provided in a base 86 of the tilling claw 85. , 88 are inserted into a pair of claw mounting holes 82, 83 provided in the flange 81, and are screwed into the nut to fix the base 86 of the tilling claw 85 to the flange 81, and two bolts 10. The washer plate 30 is provided between the bolt head of the bolt 10 and the base 86 of the tillage claw 85 and through which the two bolts 10 are inserted.

  As shown in FIGS. 2 (a) (side view) and (b) (plan view), the bolt 10 has the same shape as a commercially available product, and a bolt shaft portion 11 having a male screw 11a formed at the tip, and this base. It has a bolt head 13 connected to the end.

  The washer plate 30 is made of sheet metal, has insertion holes 31 through which the bolt shaft portions 11 of the bolts 10 are inserted on both sides, extends along the side surface of the hexagonal bolt head 13, and the bolt head 13. A bolt rotation restricting portion 33 extending from the seat surface 13a side to the top surface 13b side is provided. The bolt rotation restricting portion 33 is provided at both ends of the washer plate 30 and is configured to have four plane portions 33a, 33, 33c, and 33d that are continuously connected. The four flat surface portions 33a, 33, 33c, and 33d are arranged close to each other so as to face the side surface 13c of the hexagonal bolt head portion 13, and the side surface 13c of the bolt head portion 13 is set to these flat surface portions 33a, 33, 33c, 33d is contacted and the rotation of the bolt 10 is restricted.

  Of the four flat portions 33a, 33, 33c, and 33d, the two flat portions 33a and 33d that face each other extend beyond the top surface 13b of the bolt head 13, and the tip portions thereof are bent inward. Therefore, the movement of the bolt 10 to the side opposite to the seat surface 13a is restricted by the protruding portion 33e bent inward. The insertion hole 31 is subjected to burring to form a cylindrical part 32 on the side opposite to the side where the bolt rotation restricting part 33 is disposed, and a cylindrical shape surrounding the base side of the bolt shaft part 11 extending from the insertion hole 31. The part 32 may be caulked to restrict the movement of the bolt 10 in the axial direction with respect to the washer plate 30, so that the bolt 10 can be more reliably prevented from coming off from the washer plate 30.

  Next, a method for fixing the above-described tilling claw 85 to the flange 81 of the tilling shaft 80 using the tilling claw fastening device 1 will be described. First, as shown in FIG. 1, the base 86 of the tilling claw 85 is disposed opposite to the pair of claw mounting holes 82 and 83 of the flange 81, and a pair of communication holes 87 and 88 provided in the base 86 of the tilling claw 85. And a pair of claw attachment holes 82 and 83 are communicated. Then, the two bolts 10 of the tilling claw fastening device 1 are inserted through the pair of claw mounting holes 82 and 83 from the pair of communication holes 87 and 88. Then, as shown in FIG. 2C (side view), the nut 40 is screwed into the tip end portion of the bolt shaft portion 11 protruding from the claw mounting holes 82 and 83, and the base 86 of the tilling claw 85 is tightened. The tilling claw 85 is fixed to the flange 81.

  Here, since the bolts 10 are restricted from rotating with respect to the washer plate 30 at both ends of the washer plate 30 and are prevented from coming off, the two bolts 10 are connected to the flange 81 from the communication holes 87 and 88 of the tilling claw 85. Are inserted into the claw mounting holes 82 and 83 simultaneously. Further, even if the nuts 40 are strongly tightened to the two bolts 10, the two bolts 10 do not rotate and it is not necessary to press down the bolt heads 13 of the respective bolts.

  Thus, as shown in FIG. 1, when the tilling claw 85 is fixed to the flange 81 of the tilling shaft 80, two bolts 10 to which the tilling claw 85 is fixed are used as one set, and the base 86 of the tilling claw 85 is simultaneously set. It can be attached to the flange 81, and it is not necessary to attach the bolts 10 one by one. For this reason, the attachment of the tillage claw 85 to the flange 81 can be performed in a short time by a simple operation.

  Further, since the bolt 10 is restricted from rotating with respect to the washer plate 30 and is prevented from coming off, there is no possibility that the anti-rotation function is lowered, and the reliability of the anti-rotation function is high. Therefore, the mounting operation of the tillage claw 85 to the flange 81 can always be performed with a simple operation.

  Further, as shown in FIGS. 3A (side view), (b) (plan view), and (c) (side view), the four plane portions 33a, 33, 33c, and 33d of the bolt rotation restricting portion 33 are shown. All are extended from the seat surface 13a of the bolt head 13 to the front side of the top surface 13b to restrict the rotation of the bolt 10, and the insertion hole 31 is subjected to burring so that the bolt rotation restricting portion 33 is disposed. Even if the cylindrical part 32 is formed on the opposite side and the cylindrical part 32 surrounding the base part side of the bolt shaft part 11 extending from the insertion hole 31 is crimped, the axial movement of the bolt 10 relative to the washer plate 30 is restricted. Good.

  This makes it possible to obtain the same effects as the tillage claw fastening device 1 shown in FIG. 2 described above (ease of attaching the tillage claw 85 and improving the reliability of the rotation preventing function) and the bolt head. Since the upper part of the side surface 13c of 13 is in an exposed state, a spanner or a spectacle wrench can be used. For this reason, when it is easier to work in the state where the above-described tilling rotor is free (for example, the state where the PTO clutch is disengaged and the tilling rotor can rotate freely) as in the replacement work of the tilling claws, When the nut 40 is tightened, the tilling rotor rotates due to the reaction and the work is difficult and dangerous, but the bolt head 13 has a hexagonal shape, so a spanner or a spectacle wrench can be used. By engaging a spanner or the like with the bolt head 13, the rotation of the tilling rotor can be restricted, and the tilling claw can be safely attached and detached.

Sectional drawing of the tilling rotor which fixed the tilling nail to the flange with the tilling nail fastening device concerning one embodiment of the present invention is shown. FIG. 2A is a side view of the tilling nail fastening device, FIG. 2B is a plan view of the tilling nail fastening device, and FIG. It is a side view. The other tillage nail fastening device is shown, the figure (a) is a side view of the other tillage nail fastening device, the figure (b) is a top view of the other tillage nail fastening device, and the figure (c) FIG. 10 is a side view of another tillage claw fastening device. The conventional tillage nail fastening device is shown, the figure (a) is a side view of the conventional tillage nail fastening device, and the figure (b) is a sectional view of the conventional tillage nail fastening device.

1 Tillage Claw Fastening Device 10 Bolt (Hexagonal Bolt)
DESCRIPTION OF SYMBOLS 11 Bolt shaft part 13 Bolt head part 13a Seat surface 13b Top surface 13c Side surface 30 Washer plate 31 Insertion hole 32 Cylindrical part 33 Bolt rotation control part 40 Nut 80 Cultivation shaft 81 Flange 82, 83 Claw attachment hole 85 Cultivation claw 86 Base 87,88 communication hole

Claims (1)

A tilling claw fastening device for attaching a tilling claw to a flange provided on a tilling shaft,
Two holes that are inserted from a pair of communicating holes provided in the base portion of the tilling claw into a pair of claw mounting holes provided in the flange and screwed into a nut to fix the base portion of the tilling claw to the flange. Hex bolts,
A washer plate for inserting the two hexagon bolts,
The seat gold plate, one side to the continuously between a pair of side surfaces and these aspects including opposite sides of the hexagonal bolt head of the insertion hole and the hexagonal bolts inserted through the bolt shaft portion of the hexagonal bolt on both sides A bolt rotation restricting portion extending along two side surfaces to be connected and extending from the seat surface side of the bolt head to the front side of the top surface ;
The bolt shaft portion of the hexagon bolt is inserted into the insertion hole of the washer plate, and the bolt head is disposed inside the bolt rotation restricting portion to restrict the rotation of the hexagon bolt,
The insertion hole includes a cylindrical portion that is burring and extends to the opposite side to the side on which the bolt rotation restricting portion is disposed, and includes the cylindrical portion that surrounds the base side of the bolt shaft portion that extends from the insertion hole. The tillage claw fastening device characterized by restricting the movement of the hexagon bolt in the axial direction with respect to the washer plate.

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