JP4598139B2 - 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 with 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. It is necessary to press the bolt head so that the bolt does not rotate together with the nut during the screwing operation of the nut, thus reducing the workability of the attachment work of the tilling claw.

  What improved such an inconvenience is a tillage nail attachment device described in Patent Document 1. As shown in FIG. 3A (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 knurled eyes is provided at the proximal 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 the insertion hole 62 and inserted. As a result, the two bolts 65 are integrally fixed to the washer body 61. For this reason, as shown in FIG. 3B (cross-sectional view), the bolts 65 extend from the pair of communication holes 87 provided in the base of the tilling claw 85 to the pair of claw mounting holes 82 provided in the flange 81. 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 tightened against each 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 includes a pair of communication holes provided at a base of the tillage claw. Two hexagon bolts that are inserted through a pair of claw mounting holes provided on the flange and screwed onto the nut to fix the base of the tilling claw to the flange, and a coupling that is integrally coupled to the two hexagon bolts The connecting plate has an insertion hole through which the bolt shaft portion of the hexagonal bolt is inserted on both sides, and is welded to the seat surface of the bolt head at the widthwise intermediate portion of the opposite side surface of the bolt head. A notch is provided, a hexagon bolt bolt shaft is inserted into the insertion hole of the connecting plate, and fillet welding is performed between the notch for welding and the connecting plate .
The two hexagon bolts and the coupling plate are integrally coupled so that the welded portion is substantially contained in the notch for welding .

According to this invention, the hexagon bolt and the coupling plate are integrally coupled so that the welded portion that is fillet welded between the welding notch and the coupling plate is substantially contained in the welding notch. Therefore, it is possible to increase the coupling strength between the hexagon bolt and the coupling plate and improve the reliability of the coupling strength. Moreover, since it is only necessary to process the notch for welding in the bolt head of a commercially available bolt, an increase in cost can be suppressed. A tool such as a spanner can be attached to the bolt head.

According to the tillage nail fastening device according to the present invention, the welded portion that is fillet welded between the welding notch and the coupling plate is joined to the welding notch so that the welded portion is substantially within the welding notch. By integrally coupling with the plate, it is possible to provide a tillage claw fastening device that is low in cost and highly reliable with respect to a bolt detent function.

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. The tillage nail fastening device is shown, in which (a) is a side view of the tillage nail fastening device, and (b) is a plan view of the tillage nail 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.

  Hereinafter, a tilling claw fastening device according to the present invention will be described with reference to FIGS. 1 and 2. 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, screwed into the nut, and the two bolts 10 for fixing the base 86 of the tilling claw 85 to the flange 81, and two A coupling plate 30 coupled integrally with the bolt 10 is provided.

  As shown in FIG. 2A (side view) and FIG. 2B (plan view), the bolt 10 has the same shape as a commercially available product, and a bolt shaft portion 11 in which a male screw 11a is formed at the tip, A bolt head 13 connected to the base end portion is provided. The bolt head 13 has a hexagonal shape and enables the use of a spanner or a spectacle wrench. A welding notch 14 extending to the seat surface 13 a is provided on the opposing side surface of the bolt head 13.

  The coupling plate 30 has insertion holes 31 for inserting the bolt shaft portions 11 of the bolts 10 on both sides. When the bolt shaft 11 of the bolt 10 is inserted into the insertion hole 31 of the coupling plate 30 and fillet welding is performed between the notch 14 for welding and the coupling plate 30, the two bolts 10 and the coupling plate 30 are connected. The tillage claw fastening device 1 integrally joined is completed. The welded portion 16 that is fillet welded between the welding notch 14 and the coupling plate 30 is substantially contained in the welding notch 14, and a tool such as a spanner can be attached to the bolt head 13.

  Next, a method for fixing the tillage claw 85 to the flange 81 provided on the tillage shaft 80 using the tillage 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, the nut 40 (see FIG. 2A) is screwed to 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 to attach the tilling claw 85 to the flange 81. It sticks to.

  Here, since the bolts 10 are welded to both sides of the coupling plate 30 and fixed together with the coupling plate 30, the two bolts 10 are flanged from the communication holes 87 and 88 of the tillage claw 85. 81 is inserted through the claw mounting holes 82 and 83 at the same time. 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 head 13 of each bolt. The working time for fixing 85 can be greatly shortened. Further, when the above-described tilling rotor is in a free state (for example, the state in which the PTO clutch is disengaged and the tilling rotor can be freely rotated) like the exchanging work of the tilling claws 85, it is easy to work manually. When the nut 40 is tightened, the tilling rotor rotates due to the reaction, and the work is difficult and dangerous, but the welded portion 16 is substantially contained in the notch 14 for welding, and the bolt head 13 has a hexagonal shape. Therefore, it is possible to use a spanner or a spectacle wrench, and by engaging a spanner or the like with the bolt head 13, the rotation of the tilling rotor can be regulated, and the tilling claw 85 can be replaced safely. It can be performed.

  Thus, when fixing the tilling claw 85 to the flange 81 of the tillage shaft 80, two bolts 10 for fixing the tilling claw 85 can be attached to the base 86 and the flange 81 of the tilling claw 85 at the same time, There is no need to install 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 joined to the joining plate 30 by welding, the joining strength is strong and the reliability is high. Accordingly, it is possible to prevent a situation in which the rotation prevention function of the bolt 10 is lowered, and as a result, it is possible to always perform the mounting operation of the tillage claw 85 on the flange 81 with a simple operation.

  Moreover, since the bolt 10 of the tilling claw fastening device 1 only needs to process the notch 14 for welding in the bolt head of a commercially available bolt, an increase in cost can be suppressed.

1 Tillage Claw Fastening Device 10 Bolt (Hexagonal Bolt)
DESCRIPTION OF SYMBOLS 11 Bolt shaft part 13 Bolt head 13a Seat surface 13b Side surface 14 Notch for welding 30 Connecting plate 31 Insertion hole 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 coupling plate integrally coupled to the two hexagon bolts;
The coupling plate has insertion holes for inserting the bolt shaft portions of the hexagon bolts on both sides,
A notch for welding extending to the seating surface of the bolt head is provided at the widthwise intermediate portion of the opposite side surface of the bolt head,
A welded portion in which the bolt shaft portion of the hexagon bolt is inserted into the insertion hole of the coupling plate and fillet welded between the welding notch portion and the coupling plate is substantially accommodated in the welding notch portion. Thus, the two hex bolts and the coupling plate are integrally coupled to each other.

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