CN2183255Y

CN2183255Y - Double-stage impact drill bit

Info

Publication number: CN2183255Y
Application number: CN 94204885
Authority: CN
Inventors: 谢光辉
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-15
Filing date: 1994-03-15
Publication date: 1994-11-23
Anticipated expiration: 2004-03-15

Abstract

The utility model provides a double-stage impact drill bit, which is composed of a straight handle and a large and a small drill bits with different diameters. Spiral grooves on the drill bits are formed by rotating a parabolic shape and a circular arc line shape. The utility model is not provided with a helical land, and the end parts of the large and the small drill bits are embedded with carbide blades. The utility model is suitable for an impact drill bit to drill holes on walls or cement products.

Description

Double-stage impact drill bit

The utility model belongs to drill bit-like.

In the prior art, the drill bit of using on the percussion drill has only the single-stage of a bit body to bore, drill hammer resistance when holing on the wall or hole on cement plate that this drill bit, particularly diameter are bigger is big, and drilling efficiency is low, will use the drill hammer of several specifications that vary in size sometimes instead.

The purpose of this utility model is to invent a kind of twin-stage drill hammer, and this drill bit is because first order bit diameter is little, resistance is little, and the ability of boring is strong, second level drill bit is to carry out reaming on the basis of first order bit bore, therefore resistance is little, and penetration rate is fast, the efficient height.

The utility model is to constitute like this: bit body and staight shank by large and small different-diameter are formed, bit body and staight shank are cylindrical, helicla flute is arranged on the bit body, big bit body and bradawl head end of body setting-in carbide chip, big bit body and little bit body junction are bullets, and little bit body head is taper.

Compared with prior art, the utility model is simple in structure, the saturating ability of brill is strong, and speed is fast, the efficient height.

Accompanying drawing 1 is that structural representation of the present utility model, accompanying drawing 2 are right views of accompanying drawing 1.Among the figure: 1, staight shank, 2, big bit body, 3, carbide chip, 4, little bit body, 5, carbide chip.

Embodiment of the present utility model: in Fig. 1, staight shank (1) is cylindrical, fuse with big bit body (2), on the big bit body helicla flute is arranged, at big bit body and little bit body (4) both sides, junction symmetry two carbide chips of setting-in (3), the end of alloy blade is taper, on the outside of alloy blade and the conical surface cutting edge is arranged, the conical section of little bit body (4) and big bit body fuses, on the little bit body helicla flute is arranged, the end setting-in carbide chip (5) of little bit body, the end of alloy blade is tapered, on the outside and the conical surface cutting edge is arranged; Helicla flute of the present utility model is formed by parabolic type and the rotation of garden arc line type, and big or small bit body does not have land.

Claims

1, a kind of twin-stage drill hammer, bit body and staight shank by large and small different-diameter are formed, it is characterized in that: bit body and staight shank are cylindrical, helicla flute is arranged on the bit body, big bit body and bradawl head end of body setting-in carbide chip, big bit body and little bit body junction are bullets, and little bit body head is taper.