JPH04126994U - Earth Auger Bit - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the operability of attaching and detaching the bit body 1. [Structure] The bit body 1 having the digging blade tip 2 includes:
A central open groove 3 is provided extending from the rear end toward the front end. A mounting member 4 to be welded to the spiral blade 8 is inserted into the central open groove 3, and both are connected by a tightening bolt 5.
Fixed by In this case, the central open groove 3 is
In order to prevent lateral displacement with the mounting member 4, the bit body 1
Locking steps 11, 11 with different upper and lower sides on both sides 10, 10 of
is provided. The locking step portions 11, 11 engage with the locking convex portions 12, 12 of the mounting member 4.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to an earth auger bit that is attached to a spiral wing. This makes it easy to remove.

0002

[Conventional technology]

Traditionally, this type of earth auger bit has a mounting member extending from a spiral wing. Insert the U-shaped bit body into the hole, and tighten the tightening bolt from above and below. It is fixed by.

0003

[Problem that the idea aims to solve]

Therefore, with conventional earth auger bits, bolts may bend or bite during drilling. In some cases, this may cause an accident. This makes it difficult to work when removing used bits. In the worst case scenario, the entire mounting member could melt.

0004 For this reason, in this invention, the earth auger bit can be easily installed and removed. In addition, the structure has been improved so that the bolt is less likely to bend or bite.

[0005]

[Means to solve the problem]

The present invention was developed in view of the above points, and the central open groove of the bit body is Locking step portions are formed on both sides at different upper and lower positions, and engage with the locking convex portion of the mounting member. It is configured to match.

[0006]

[Effect]

The earth auger bit of this invention has a locking step formed in the central open groove, which can be removed. Since it engages with the locking convex part of the attachment member, lateral slippage does not occur during excavation. Therefore, it has the function of preventing the bolt from bending or jamming.

[0007]

【Example】

Below, please refer to the figure for an example of the earth auger bit of the present invention. I will explain.

[0008] 1 to 3, 1 is a bit with a cutting blade tip 2 brazed to the tip. The bit body 1 has a middle extending from the rear end to the tip. A central open groove 3 is provided. In this central open groove 3, there is a A fastening member 4 is inserted, and both are fixed with a tightening bolt 5. Therefore Then, mounting holes 6 and 7 are formed between the two, respectively, passing through in the vertical direction. It has become. In this case, the attachment member 4 has a rear end, as can be seen in FIG. is welded to the spiral blade 8 of the earth auger bit. Furthermore, Figure 5 In this case, the bit body 1 is attached to the back side of the spiral blade 8 in order to increase the installation strength. It is also supported by a welded receiving plate 9.

[0009] Therefore, the central open groove 3 of the bit body 1 has both side surfaces 10, 10. , upper and lower locking steps 11, 11 are formed, and are provided on the upper and lower surfaces of the mounting member 4. The locking convex portions 12, 12 are engaged with each other. therefore , preventing lateral slippage during excavation.

0010 Note that the drilling blade tip 2 brazed to the bit body 1 is shown in FIG. Although the surface has a symmetrical V-shape, it may also be asymmetrical as shown in Figure 4. be. If necessary, it can be changed as appropriate depending on the drilling application.

[0011]

[Effect of the idea]

As explained above, the present invention provides the central open groove 3 of the bit body 1 and the mounting member. Since the mounting configuration in 4 has been improved, there is no possibility of bending or biting of the tightening bolt 5. This has the advantage that it prevents damage and facilitates removal after use.

[Brief explanation of drawings]

[Fig. 1] A front view showing an embodiment of the earth auger bit of the present invention.

[Figure 2] Side view,

[Figure 3] Plan view in the left diagonal direction,

[Fig. 4] A plan view in the left diagonal direction showing another embodiment,

[Figure 5] A side view of the spiral wing attached.

[Explanation of symbols]

1 Bit body 3 Center open groove 4 Mounting parts 5 Tightening bolt 8 spiral wings 10 side 11 Locking stepped portion 12 Locking protrusion

Claims (1)

[Scope of utility model registration request] 1. The bit body 1 is formed with a substantially U-shaped central open groove 3 extending from the rear end toward the distal end, and a mounting member to be welded to the spiral blade 8 is provided in the central open groove 3. 4 is inserted, and both are tightened with bolt 5.
In this earth auger bit, the central open groove 3 of the bit body 1 has locking step portions 11, 11 formed at opposite sides on both sides 10, 10 of the center opening groove 3 of the bit body 1. An earth auger bit characterized in that it is adapted to engage with locking convex portions 12, 12 of No. 4.