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Class Information
Number: 175/272
Name: Boring or penetrating the earth > Cutter element laterally shiftable below ground (e.g., expansible) > Cutter element shifted by relatively longitudinally movable threaded elements
Description: Apparatus in which the laterally movable cutter element is connected to a pair of elements having cooperating screw threaded portions, said elements being relatively movable in a direction parallel to the longitudinal axis of the shaft due to the action of the screw threads to cause the cutter element to move laterally.

Patents under this class:

Patent Number Title Of Patent Date Issued
8439135 Down-the-hole drill hammer having an extendable drill bit assembly May. 14, 2013
8235147 Apparatus and method for installing ground anchoring systems Aug. 7, 2012
8210251 Slickline conveyed tubular cutter system Jul. 3, 2012
7467661 Downhole perforator assembly and method for use of same Dec. 23, 2008
7353889 Rotary driven pipe-bursting tool Apr. 8, 2008
6607046 Expandable drill bit Aug. 19, 2003
5460231 Device and method for augering a conical hole in solid media Oct. 24, 1995
4651837 Downhole retrievable drill bit Mar. 24, 1987
4640373 Bore head for deep-hole boring Feb. 3, 1987
4339008 Well notching tool Jul. 13, 1982
4270618 Earth boring apparatus Jun. 2, 1981
4159149 Coal mining auger Jun. 26, 1979

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