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Class Information
Number: 175/260
Name: Boring or penetrating the earth > Tool removable or insertable through or around driving or driven shaft or casing > Laterally shiftable cutter element movable through shaft > Cutter element engages torque transmitting abutment on shaft when expanded
Description: Apparatus in which the shaft has an element or portion having a surface which extends substantially longitudinally and radially of the shaft and which is engaged by a portion of the cutter element so that rotary motion about the shaft axis may be transmitted from the shaft to the cutter element or from the cutter element to the shaft.

Sub-classes under this class:

Class Number Class Name Patents
175/261 With additional torque transmitting abutment on bit head and shaft 9

Patents under this class:

Patent Number Title Of Patent Date Issued
8016051 Drilling apparatus and method for drilling wells Sep. 13, 2011
7775302 Casing shoe and retrievable bit assembly Aug. 17, 2010
7673707 Drilling apparatus and system for drilling wells Mar. 9, 2010
6206114 Tool for transporting cutting means to and from a ground drill Mar. 27, 2001
6059053 Retraction system for a latching mechanism of a tool May. 9, 2000
5009271 Drill assembly Apr. 23, 1991
5009274 Laterally adjustable drilling tool Apr. 23, 1991
4878549 Wire line core barrel Nov. 7, 1989
4651837 Downhole retrievable drill bit Mar. 24, 1987
4550788 Roof bolt hole groover Nov. 5, 1985
4497382 Retractable core drill bit Feb. 5, 1985
4470470 Boring apparatus Sep. 11, 1984
4384627 Retractable well drilling bit May. 24, 1983
4281722 Retractable bit system Aug. 4, 1981
3965996 Means and method of drilling wells Jun. 29, 1976

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