Title:
DIRECTIONAL MULTI-BLADE BORING HEAD
Document Type and Number:
Japanese Patent JP3458247
Kind Code:
B2
Abstract:
PURPOSE: To obtain a directional multi-blade boring head, which carries out better directional boring control, efficiently works through a variety of soil conditions, and has improved cutting performance.
CONSTITUTION: Directional multi-blade boring heads 1000, 1050 are disclosed, which have first and second blades 1030, 1032 each of which defines a deflecting surface 1036, 1038 for deflecting the boring head, when the head is advanced without rotation. At least one intermediate blade 1034 extends between the deflecting surfaces in a three-blade design. In a four-blade design, a second intermediate blade 1042 extends on a side opposite the first intermediate blade 1034. The directional multi-blade boring head is particularly effective in drilling a straight bore hole through a variety of soil conditions, when the boring head is simultaneously rotated and advanced along the direction of boring.
Inventors:
Eartha, Dee, Dicken
Caddy, Elle, Sowell
Caddy, Elle, Sowell
Application Number:
JP13386194A
Publication Date:
October 20, 2003
Filing Date:
May 25, 1994
Export Citation:
Assignee:
The, Charles, Machine, Walks, Incorporated
International Classes:
E21B7/04; E21B7/06; E21B7/08; E21B7/26; E21B10/00; E21B10/08; E21B10/20; E21B10/42; E21B10/54; E21B10/60; E21B10/62; E21B21/00; (IPC1-7): E21B10/00; E21B7/08; E21B10/60
Domestic Patent References:
| JP376988A | ||||
| JP3119288A | ||||
| JP35593A | ||||
| JP585718B2 | ||||
| JP6160235B2 |
Attorney, Agent or Firm:
Yuzo Sanada (1 person outside)
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