JPH04202993A - Earth auger cutter - Google Patents

Abstract

PURPOSE:To ease attaching work of a cutter to a holder by composing a cutter with a fixing part, fixing the cutter to a holder, and a cutting part on a tip actually making cutting, and forming these parts point-symmetrical to an assembling center of the holder. CONSTITUTION:An earth auger cutter is composed of a holder 1 and a cutter 2. The holder 1 is formed with a bottom plate part 11, a side plate part 12, and a protruded part 13, and recessed grooves 16 orthogonal to the side plate part are provided on both the sides of the protruded part 13. The cutter 2 is formed with right and left feet parts 21a and 21b, engaged with the holder 1, and a bridge 22 to be made a fixed part 27, and moreover a cutter blade 23 is fixed to the tip of the bridge 22 to be made a cutting part 28. Also the fixed and cutting parts 27 and 28 are made point-symmetrical to an assembling center of the holder 1. This enables attaching of the cutter 2 to the holder 1 even if the right and the left are reversed, resulting in simplification of the attaching work.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a crank-type earth auger cutter that is detachably attached to a cutter at the tip of an earth auger.

``Prior art'' There is a known cutter for earth auger in which a cutting cutter for excavation is detachably attached to a holder provided at the tip of the earth auger body, so that it can be easily replaced if the cutter is worn out or damaged. (Jikko Sho 62-31505
(see publication).

``Problems to be Solved by the Invention'' However, the conventional earth auger cutter has a fixed mounting direction to the holder, and must be mounted without making a mistake in the mounting direction, making mounting troublesome.

Also, due to the rotational speed of the cutter, the outer circumferential side in the direction of rotation wears out faster, but at this time, even though the inner circumferential side is not so worn, the outer circumferential side has worn out by a considerable amount, so it must be replaced. It was uneconomical to obtain

The present invention has been made to solve the above problems, and its purpose is to provide a cutter for an earth auger that can be easily attached to a holster and is economically advantageous.

"Means for Solving the Problems" The earth auger cutter of the present invention has a structure in which both the fixed part and the excavated part are formed point-symmetrically with respect to the assembly center line of the holder.

Effect j As mentioned above, both the fixed part and the excavated part are formed point symmetrically, so there is a
When installing, the cutter shape will be the same.

That is, the mounting direction to the holder is not fixed, and the mounting can be done even if the left and right sides are reversed.

Furthermore, even if the outer circumferential side of the cutter has progressed to wear, the outer circumferential side blade part and the inner circumferential side blade part can be replaced by removing the cutter, rotating it 180 degrees, and attaching it.

"Example" Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 indicates a holder, and the holder I is fixed at a predetermined angle to an auger head (not shown) at the tip of the earth auger main body by a fixing means such as welding.

2 is a convex-concave fit on the holster 1, and the bolt 3 and the nut l-
4 is a cutter that is fastened and fixed.

The holder 1 includes a bottom plate part 11 and a side plate part 12 that stands up from one side of the bottom plate part 11 so as to be orthogonal to the bottom plate part 11.
and a convex portion 13 that stands at the center of the bottom plate portion 11 so as to be orthogonal to the bottom plate portion 11 and the side plate portions 12. Concave grooves 11a extending in a direction perpendicular to the side plate part 12 are formed on both sides of the convex part I3 on the upper surface of the bottom plate part 11. Further, a through hole 14 for inserting the bolt 3 is formed in the center of the convex part 13, and a wide part is formed at the end of the convex part 13 on the side plate part 12 side and the end on the opposite side. 13a
is formed.

On the other hand, the cutter 2 has both left and right legs 21a, 21b and the legs 21a so as to fit into the holder 1.

21'b, and a cutter blade 23 is fixed to the central tip of the bridge part 22 by fixing means such as brazing or the like.

A convex portion 24 that fits into the groove 11a of the bottom plate portion 11 of the holder 1 is formed on the inner side of the end surface of the leg portions 21a, 21b, and a convex portion of the holder 1 is formed on the inner peripheral surface of the leg portions 21a, 21b. A stepped portion 25 that fits into the wide portion 14a of the portion 14 is formed. Also, the leg portion 21a.

Through holes 26, 26 are formed in the center of 21b at positions that are coaxial with the through hole 14 of the holder 1 during assembly. Here, the legs 21a, 21b and the inner part of the bridge part 22 become a fixed part 27 for fixing the cutter 2 to the holster 1, and the outer peripheral side of the bridge part 22 including the cutter blade 23 becomes an excavating part 28. Become.

Moreover, each part 21a, 21b, 2 constituting the cutter 2
2, 23, and 25 are provided point-symmetrically with respect to the assembly center line Q of the holder 2.

However, in the cutter 2 having the above configuration, since the parts constituting the cutter 1 are arranged point-symmetrically, it is difficult to install the cutter 2 at a negative angle with respect to the holder l, and when it is installed by rotating it by 180 degrees. In both cases, the cutter shape will be the same when installed. That is, the direction in which the cutter 2 is attached to the holder 1 is not determined, and the cutter 2 can be attached even if the left and right sides are reversed.

In addition, even if the outer circumferential blade part of the horned ivy 2 (the blade part on the side indicated by A in Fig. 1) has progressed, remove the port 3 and nut 4, remove the cutter 2, and rotate it 180 degrees. By reattaching it, the outer blade part and the inner blade part can be replaced, and the inner blade part can be reused.

Furthermore, excavation can be performed either when the earth auger head to which the cutter 2 is attached is rotated forward or backward.

"Effects of the Invention" As explained above, according to the present invention, since both the fixed part and the excavated part are formed point-symmetrically, the mounting direction to the holter is not fixed, and the mounting can be done even if the left and right sides are reversed. This simplifies the work of attaching it to the holder.

In addition, even if the outer circumferential side of the cutter has progressed to wear, by removing the cutter, rotating it 180 degrees, and attaching it, you can replace the outer circumferential edge and the inner circumferential edge, which is economically advantageous. Become.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a perspective view of the same. 1... Holder 2... Cutter 21a... Leg 21b... Leg 23... Cutter blade 27... Covered Fixed part 28... Excavation part

Claims (1)

[Claims] A cutter that is detachably attached to a holder at the tip of an earth auger, and the cutter has a fixed part that is fixed to the holder and an excavating part at the tip that actually excavates, and both the fixed part and the excavating part are A cutter for an earth auger characterized by being formed point-symmetrically with respect to the assembly center line of the holder.