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Class Information
Number: 175/381
Name: Boring or penetrating the earth > Bit or bit element > Cutting edges relatively longitudinally movable during operation
Description: Apparatus in which the bit is provided with a plurality of cutter elements or cutting edges which elements or edges are connected to the bit in such a manner as to permit axial movement of one cutter element or cutting edge relative to another during normal operation of the bit.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7328755 |
Hydraulic drill bit assembly |
Feb. 12, 2008 |
| 7270196 |
Drill bit assembly |
Sep. 18, 2007 |
| 7258179 |
Rotary bit with an indenting member |
Aug. 21, 2007 |
| 7225886 |
Drill bit assembly with an indenting member |
Jun. 5, 2007 |
| 7198119 |
Hydraulic drill bit assembly |
Apr. 3, 2007 |
| 6527067 |
Lateral entry guidance system (LEGS) |
Mar. 4, 2003 |
| 6338390 |
Method and apparatus for drilling a subterranean formation employing drill bit oscillation |
Jan. 15, 2002 |
| 6213230 |
Drilling tool especially for the rotary percussion drilling of preferably rock |
Apr. 10, 2001 |
| 6142250 |
Rotary drill bit having moveable formation-engaging members |
Nov. 7, 2000 |
| 6116827 |
Drilling tool |
Sep. 12, 2000 |
| 5788430 |
Drilling tool for rotary percussion drilling |
Aug. 4, 1998 |
| 5388649 |
Drilling equipment and a method for regulating its penetration |
Feb. 14, 1995 |
| 5088568 |
Hydro-mechanical device for underground drilling |
Feb. 18, 1992 |
| 5018590 |
Electromagnetic drilling apparatus |
May. 28, 1991 |
| 5004056 |
Percussion-rotary drilling tool |
Apr. 2, 1991 |
| 4478296 |
Drill bit having multiple drill rod impact members |
Oct. 23, 1984 |
| 4386669 |
Drill bit with yielding support and force applying structure for abrasion cutting elements |
Jun. 7, 1983 |
| 4354561 |
Reciprocating drill bit |
Oct. 19, 1982 |
| 4105081 |
Rock-drilling and bolt-setting apparatus |
Aug. 8, 1978 |
| 4076087 |
Hole reamer |
Feb. 28, 1978 |
| 3957125 |
Multi-stage double-acting extendible and contractible shaft drive for drilling device |
May. 18, 1976 |
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