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:
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