Importance

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Abstract

A bore hole wall undercutting or reaming device in which a rotatable tubular support housing (1) (61) is adapted for rotation by drive means, has at least one circumferential guide slot in its side wall for receiving and guidingly supporting a cutting tool (4) (60) for movement outwardly to and inwardly from a cutting position. The cutting tool may comprise either a rigid and/or resilient slide or pivot lever (9) having a trailing end portion supporting a cutting member (10) thereon and a leading end portion connected to the housing by a single rigid, or pivotal pull type connection by which the housing tensions and pulls the cutting tool (4) around during a cutting operation. Adjustable cutting tool positioning means are provided which include an axially displaceable feed control rod (6) (63) with at least one camming surface thereon adapted to engage and displace the slide or pivot lever (9) relative to the housing and actuated by either one of a pair of relatively adjustable threaded members (26) (27) rotatably mounted on the housing or a tubular body (68) slidably mounted on the support housing and operable from a portion of the housing outside the bore hole.

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First Claim