KR101468567B1 - Bit assembly - Google Patents

Abstract

The present invention relates to a bit assembly for use in perforating a ground, comprising an outer bit 20 mounted to a casing rod via a bushing 10, an inner bit 30 detachably coupled to the outer bit 20, Wherein the outer bit 20 is formed such that the left and right jaws 21 and 22 are opposed to each other in the middle of the inner circumferential surface and the left jaw 21 is connected to the outer bit 20, And the right hooking jaw 22 is divided into a first hooking step 21a and a second hooking step 21b by the first nose portion 23 formed on the inner peripheral surface of the outer bit 20, And the nose portion 24 is divided into the third stopping jaw 22a and the fourth stopping jaw 22b.

Description

[0001] BIT ASSEMBLY [0002]

[0001] The present invention relates to a bit assembly for use in perforating a ground, and more particularly, to a bit assembly for use in perforating a ground, wherein a pair of retaining jaws formed on the inner circumferential surface of the outer bit are opposed to each other, To an engaging groove of an air hammer rotating in a counterclockwise direction and a engaging groove of an air hammer rotating in a clockwise direction so that the outer bit can be commonly used for an air hammer and a drifter.

Korean Patent No. 10-0912720 (registered on Aug. 11, 2009) of the present applicant has introduced "straight hole bits ".

The straightforward bit is such that the bushing fitted to the outer bit is coupled to the outer bit by the C-ring, and the inner bit 40 disposed within the outer bit is detachably coupled to the outer bit.

However, since the through-hole bit is formed in one of the engaging grooves of the engaging portion formed in the outer bit, the outer bit is suitable for the air hammer rotating in the clockwise direction during the perforating operation, It is necessary to produce an outer bit suitable for the drifter, so that there is a disadvantage that the stock amount of the outer bit becomes large.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an air hammer in which a pair of engagement protrusions formed on the inner circumferential surface of an outer bit face each other, the engagement protrusion is divided by the nose portion, And can be coupled to a coupling groove of an air hammer rotating in a clockwise direction, so that the outer bit can be commonly used for an air hammer and a drifter.

In order to achieve the above object, the present invention provides a bit assembly comprising an outer bit mounted on a casing rod through a bushing and an inner bit detachably coupled to an outer bit,

And a left latching jaw is divided into a first latching jaw and a second latching jaw by a first nose portion formed on the inner circumferential surface of the outer bit, and the left latching jaw is divided into a first latching jaw and a second latching jaw, And the right jaw is divided into the third jaw jaw and the fourth jaw jaw by the second nose portion formed on the inner peripheral surface of the outer bit.

Wherein the inner bit is one of an air hammer or a drifter, a plurality of tips are mounted on a lower end of the head part, first and second engaging projections are arranged symmetrically around the head part, And a second stopper protrusion are formed on the upper surface of the first engaging protrusion. A first stopper protrusion is formed on the upper portion of the first engaging protrusion, a first engaging recess is formed between the first engaging protrusion and the first stopper protrusion, 2 stopper protrusions are formed, and a second engaging groove is formed between the second engaging protrusion and the second stopper protrusion.

Accordingly, the bit assembly according to the present invention can be commonly used for an air hammer that rotates the outer bit counterclockwise and a drifter that rotates clockwise, so that the stock amount of the outer bit can be reduced, There is no groove machining, and there is an effect that the outer bit can be machined quickly and precisely.

Figure 1 is an exploded side view of a bit assembly in accordance with the present invention.
Figure 2 is a perspective view showing the outer bit of the bit assembly.
3 is a plan view showing the outer bits of FIG.
4 and 5 show an example in which the inner bit drifter is coupled to the outer bit.
6 is a cross-sectional view taken along the line AA of FIG. 5 with the drift coupled to the outer bit.
7 and 8 show an example in which an inner bit, which is an inner bit, is coupled to an outer bit.
9 is a cross-sectional view taken along line BB of Fig. 8 with an air hammer coupled to an outer bit.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1, a bit assembly according to the present invention includes an outer bit 20 mounted through a bushing 10 to a casing rod (not shown), an inner bit 20 detachably coupled to the outer bit 20 30).

2 and 3, the outer bit 20 has a left jaw 21 (located on the left side in FIGS. 2 and 3) and a right jaw 22 (FIG. 2 and FIG. 3 And the left hooking jaw 21 is formed by the first nose portion 23 formed on the inner circumferential surface of the outer bit 20 so as to face the first hooking jaw 21a and the second hooking jaw 21, And the right stopping jaw 22 is divided into the third stopping jaw 22a and the fourth stopping jaw 22b by the second nose portion 24 formed on the inner peripheral surface of the outer bit 20 .

1, the inner bit 30 is any one of an air hammer and a drifter, and a plurality of tips 32 are mounted on the lower end of the head part 31, The first and second engaging projections 33a and 33b are arranged symmetrically with respect to each other and the first and second stopper projections 34a and 34b are formed at the upper end of the head portion 31 so that the first engaging projection 33a The first stopper protrusion 34a is formed on the upper surface of the first stopper protrusion 34a so that the first engagement protrusion 34a is formed between the first engagement protrusion 33a and the first stopper protrusion 34a, A second stopper projection 34b is formed on an upper portion of the first stopper projection 34b and a second engagement groove 35b is formed between the second engagement projection 33b and the second stopper projection 34b.

1 shows a typical drift lifter of inner bit, the present invention is not limited thereto.

In the bit assembly according to the present invention constructed as described above, an air hammer or a drifter, which is an inner bit, may be mounted on an outer bit as follows, and an outer bit may be commonly used.

4, the first and second stopper projections 34a and 34b of the inner bit 30 are engaged with the left jaw 21 of the outer bit 20, The first and second engaging projections 33a and 33b of the inner bit 30 are inserted between the left engaging jaw 21 and the engaging jaw 22 of the outer bit 20 until the engaging jaw 22 is engaged with the inner bit 20, Fit.

5, until the first and second engaging projections 33a and 33b of the inner bit 30 are engaged with the first and second nose portions 23 and 24 of the outer bit 20, 5 and 6, by rotating the drifter in the inner bit 30 in the clockwise direction relative to the outer bit 20 in the direction of the arrow 50 relative to the outer bit 20, The engaging protrusions 21b and the third engaging protrusions 22a are inserted into the engaging grooves of the inner bit so that the second engaging protrusions 21b of the outer bit 20 engage with the first engaging protrusions 33a And the third stopping protrusion 22a of the outer bit 20 is engaged with the second engaging protrusion 33b of the inner bit 30 and the second stopper protrusion 34b of the inner bit 30, do.

Thereafter, the drifter rotates in the clockwise direction to perforate the ground. When the ground penetration is completed, the drifter rotates counterclockwise, and the inner bit is separated from the outer bit.

7, the first and second stopper projections 34a and 34b of the air hammer, which is the inner bit 30, are positioned on the left side (left side) of the outer bit 20, The first and second engaging projections 22 of the inner bit 30 are inserted between the engaging shoulder 22 and the left engaging jaw 21 of the outer bit 20 until the engaging jaw 21 and the right engaging jaw 22 engage with each other 33a, 33b.

Thereafter, as shown in Fig. 8, until the first and second engaging projections 33a and 33b of the inner bit 30 are engaged with the first and second nose portions 23 and 24 of the outer bit 20, And the air hammer which is the inner bit 30 is rotated in the counterclockwise direction relative to the outer bit 20 in the direction of the arrow 55 as shown in FIGS. 8 and 9, The first latching protrusion 21a and the fourth latching protrusion 22b are inserted into the inner bit coupling grooves so that the first latching protrusion 21a of the outer bit 20 is inserted into the first coupling protrusion 33a and the first stopper protrusion 34a and the fourth engaging protrusion 22b of the outer bit 20 is engaged with the second engaging protrusion 33b of the inner bit 30 and the second stopper protrusion 34b .

Thereafter, the air hammer rotates in the counterclockwise direction to pierce the ground. When the ground penetration is completed, the air hammer rotates in the clockwise direction, and the inner bit is separated from the outer bit.

As described above, the bit assembly according to the present invention can be commonly used for an air hammer in which the outer bit 20 rotates in a counterclockwise direction and a drifter rotating in a clockwise direction, thereby reducing the stock amount of the outer bit, There is no grooving when the inner circumferential surface of the outer bit is machined, and the outer bit can be machined quickly and precisely.

10: Bushing 20: Outer Bits
30: Inner Bits

Claims (2)

1. A bit assembly comprising an outer bit (20) mounted through a bushing (10) to a casing rod and an inner bit (30) detachably coupled to the outer bit (20)
The outer bit 20 is formed in the middle of the inner circumferential surface so that the left hooking jaw 21 and the right hooking jaw 22 are opposed to each other and the left hooking jaw 21 is formed on the inner peripheral surface of the outer bit 20, Is formed by the second nose portion (24) formed on the inner peripheral surface of the outer bit (20) by the first and second engaging protrusions (21a, 21b) 3 stopping jaw 22a and the fourth stopping jaw 22b,
The inner bit 30 is any one of an air hammer and a drifter. A plurality of tips 32 are mounted on the lower end of the head part 31, First and second stopper projections 34a and 34b are formed at the upper end of the periphery of the head portion 31 so that the first stopper projections 34a and 34b are formed on the upper portion of the first stopper projections 33a, A projection 34a is formed so that a first engaging groove 35a is formed between the first engaging projection 33a and the first stopper projection 34a and a second engaging projection 35b is formed on the upper portion of the second engaging projection 33b, And a second engaging groove 35b is formed between the second engaging projection 33b and the second stopper projection 34b.
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