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Class Information
Number: 175/261
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 > With additional torque transmitting abutment on bit head and shaft
Description: Apparatus in which the cutter element is carried by a bit head and the shaft and bit head are also provided with mutually engaging drive transmitting surfaces which transmit torque between the shaft and bit head.

Patents under this class:

Patent Number Title Of Patent Date Issued
8678108 Torque transmitting elastomeric element in casing drilling drill lock assembly Mar. 25, 2014
7234542 Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells Jun. 26, 2007
7036610 Apparatus and method for completing oil and gas wells May. 2, 2006
5881827 Extendable bit Mar. 16, 1999
5743344 System for in situ replacement of cutting means for a ground drill Apr. 28, 1998
5181577 Device for fixing disk cutter to tunnel excavator Jan. 26, 1993
4760888 Drill bit for core boring Aug. 2, 1988
4651837 Downhole retrievable drill bit Mar. 24, 1987
4470470 Boring apparatus Sep. 11, 1984

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