Patent ID: 7770670
Filing Date: 2010-08-10
Classification: E21B

Abstract:
1. A rotary mining apparatus, comprising: a first housing portion, wherein said first housing portion includes a first aperture; a second housing portion, wherein said second housing portion is movable relative to said first housing portion along an axis, wherein said second housing portion comprises a drive end adapted to receive a rotational drive force, and wherein said first housing portion and said second housing portion are configured to be rotated about said axis; a flexible connecting member, wherein said connecting member is mounted to said second housing portion and extends through said first aperture in said first housing portion, and wherein said flexible connecting member comprises at least one of a solid-core cable and a twisted-strand cable; and a cutting member mounted to said connecting member, wherein said cutting member is configured to be rotated about said axis when said first housing portion and said second housing portion are rotated about said axis, and wherein said cutting member is configured to be radially extended with respect to said axis when said second housing portion is moved relative to said first housing portion along said axis.