JPS5854882Y2 - Center drive tiller - Google Patents

Description

[Detailed description of the invention] This invention relates to a center drive type cultivating device, which easily and reliably prevents the head of the claw shaft fastening bolt from being worn out, and protects the claw mounting bracket at the end of the claw shaft. With the goal.

The tilling section of a center drive type tillage device has a cylindrical claw shaft fitted onto a tilling shaft supported by a transmission case with a spline or key, and a disk-shaped bolt head holder on the end surface of the claw shaft. Normally, the bolt is passed through this receiver and screwed into the female thread formed on the tiller shaft, but with this method, the bolt head often wears out so much that it becomes impossible to reassemble and disassemble it.

Furthermore, the claw mounting bracket provided at the end of the claw shaft was similarly damaged, making it difficult to replace the claw.

In view of the above-mentioned circumstances, the inventors of the present invention have devised a bolt head holder to prevent wear on the bolt head and to prevent damage to the claw mounting bracket. In a center drive type cultivating device in which the claw shaft is fixed to the tilling shaft by a bolt that penetrates the claw shaft axis through a bolt head rest that contacts the bolt head rest, the bolt head rest is a protrusion that fits into the inner hole of the claw shaft. , a recess formed in the protrusion into which the bolt head is inserted, and a large-diameter flange portion that contacts the outer end surface of the claw shaft and covers the claw mounting bracket provided on the outer periphery of the claw shaft end from the outside. It is made by integrally molding it into a hat shape.

Specific examples of the present invention will be described in detail with reference to the drawings.
In the figure, reference numeral 1 denotes a transmission case, in which a transmission mechanism using a chain or gears is built.

A pair of left and right support arms 2 extend outward from both upper sides of the transmission case 1 and support the tilling cover 4 via a bracket 3.

Reference numeral 5 denotes a tilling shaft, which is supported at the lower part of the transmission case 1 so as to be relatively rotatable, and passes through the case 1 in the lateral direction.

A female thread 5a is formed at the end surface axis of the tilling shaft 5.

Reference numeral 6 denotes a cylindrical pawl shaft to which a number of pawls 7 are attached, which is coupled to the tilling shaft 5 with a key or a spline and fitted into the mantle.

B is a bolt head holder, which is attached to the outer end surface of the claw shaft 6.

This receiver 8 comes into contact with a protrusion 8a that fits into the inner hole of the claw shaft 6, a recess 8C that is concentrically provided in the projection 8a and into which the bolt head 10 is inserted, and an outer end surface of the claw shaft 6. In addition, a large diameter flange portion 8b that covers the claw mounting bracket 12 provided on the outer periphery of the end of the claw shaft 6 from the outside is integrally molded into a bat shape.

Reference numeral 9 denotes a fastening bolt having a head 10, the shaft portion of which is inserted into the pawl shaft 6 with a spring washer 11 interposed between the head 10 and the receiver 8, and the head 10 is twisted with a tool such as a box wrench. The threaded portion is screwed into the female thread 5a.

Incidentally, when the bracket 12 is spaced apart from the flange 8b, the flange 8b may be bent so as to be closer to the bracket 12 when the bracket 12 is attached to the claw.

In addition, in Fig. 1, 14 is an inclined claw shaft, and the tilling shaft 6
If a claw is provided here, it can be used to dispose of leftover tillage.

According to the present invention configured as described above, the head 10 of the fastening bolt 9 is brought into contact with the recess 8C of the receiver 8 and is crowded from the end surface of the claw shaft 6, so that the head 10 is worn out during tilling. Never.

This is especially advantageous when plowing along the furrow or deep.

Further, since the flange 8b has a larger diameter than the pawl shaft 6, the end face of the pawl shaft 6 can also be protected from wear.

Furthermore, since the flange portion 8b has a larger diameter than the claw mounting bracket 12, it protects the claw mounting bracket 12 and also protects the claw 7 mounting bolts 13, thereby preventing damage to these parts and preventing hindrance to the claw replacement work. I don't want it.

In other words, in the conventional example, the bolt head A is connected to the pawl shaft B as shown in Figure 3.
Since the bolt head A was more exposed than the receiver C that was applied to the bolt, the bolt head A was severely worn out by the dirt and stones A, and there was a risk that reassembly and disassembly would be impossible. That's what I did.

[Brief explanation of the drawing]

FIG. 1 is a rear view of the present invention, FIG. 2 is a sectional view of the main part, and FIG. 3 is an explanatory diagram of a conventional example. 1...Transmission case, 5...Plowing shaft, 5
a...Female screw, 6...Claw shaft, 7...
...Claw, 8...Bolt head holder, 8a...
... Protrusion, 8C ... Concavity, 8b ... Flange, 9 ... Fastening bolt, 10 ...
bolt head.

Claims (1)

[Scope of utility model registration request] The claw shaft 6 is connected to the tilling shaft 5 by a bolt 9 that penetrates through the axial center of the claw shaft 6 through a bolt head holder 8 that contacts the outer end surface of the cylindrical claw shaft 6.
In the center drive type cultivating device fixed to the tiller, the bolt head receiver 8 includes a protrusion 8a that fits into the inner hole of the claw shaft 6, and a recess 8C that is recessed in the protrusion 8a and into which the bolt head 10 is inserted.
and a large-diameter flange portion 8b that contacts the outer end surface of the claw shaft 6 and covers the claw mounting bracket 12 provided on the outer periphery of the end of the claw shaft 6 from the outside. A center drive type tillage device that is characterized by the ability to