JPS60107193U

JPS60107193U - ground excavation bit

Info

Publication number: JPS60107193U
Application number: JP19901583U
Authority: JP
Inventors: 正美和田
Original assignee: 日立建機株式会社
Priority date: 1983-12-27
Filing date: 1983-12-27
Publication date: 1985-07-20
Also published as: JPS6312221Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は本考案の掘削ビットを使用して地盤掘削を行な
っている状態を示すリバースサーキュレーションドリル
の部分縦断面図、第２図は本考案の掘削ビットの一実施
例を示す正面図、第３図は第２図の底面図、第４図は第
３図のＡ−Ａ断面図、第５図および第６図はそれぞれ第
４図のＢ　−Ｂ断面図およびＣ−Ｃ断面図である。１・・・掘削ビット、１７・・・回転カッタ、１７′・
・・補助カッタ、１７“、２６・・・カッタチップ、１
８・・・吸込口、２５・・・刃先。FIG. 1 is a partial vertical sectional view of a reverse circulation drill showing a state in which ground excavation is performed using the drilling bit of the present invention, and FIG. 2 is a front view showing an embodiment of the drilling bit of the present invention. Fig. 3 is a bottom view of Fig. 2, Fig. 4 is a sectional view taken along line A-A of Fig. 3, and Figs. 5 and 6 are sectional views taken along B-B and C-C of Fig. 4, respectively. be. 1...Drilling bit, 17...Rotary cutter, 17'.
...Auxiliary cutter, 17", 26...Cutter tip, 1
8...Suction port, 25...Blade tip.

Claims

[Scope of Claim for Utility Model Registration] 1. A ground excavation bit having a suction port at the lower end of the excavation bit at the center of rotation of the excavation, which has an excavation blade on the outer surface below the suction port of the excavation bit. A plurality of rotary cutters, which are pressed against the ground and rotated as the bit rotates, are installed so that the lower ends of the rotary cutters face toward the excavation center side of the excavation bit, and the rotary cutters have a vertical angle d of 0 to 3.
The rotary cutter is formed into a truncated cone shape with an angle of 0 degrees, and the angle C that the center line of the rotary cutter makes with the excavation center line of the excavation bit is 2 to 2.
30 degrees, and the angle C' that the outer surface of the outside of the drilling bit of the rotary cutter makes with the drilling center line of the drilling bit is 5.
~45 degrees and 12 degrees, and the distance between the outer surface of the lower end of the rotary cutter and the excavation center line of the bit is smaller than the radius of the suction port of the excavation bit, and the cutting edge of the rotary cutter A ground excavation bit characterized in that the interval between the blade grooves is formed so that it becomes wider from the bottom to the top. 2. The ground excavation bit according to claim 1, which is a registered utility model, characterized in that an auxiliary cutter is provided below the suction port of the bit so as to be located between the rotating cutters. 3. The ground excavation bit according to claim 1, wherein a cutter tip made of cemented carbide is press-fitted into the cutting edge of the outer surface of the rotary cutter and the cutting edge of the auxiliary cutter.