Patent ID: 8647030

Claim:
A coring apparatus for forming a hole in a substrate, the apparatus comprising: an elongate torque shaft attachable to a section of the substrate to be cut, the shaft having a cylindrical outer surface and a groove extending along a length of the shaft; a core bit baying a cylindrical configuration, a first end of the core bit having a cutting configuration for forming an outer periphery of the hole to be cut into the substrate, a second end of the core it having a bearing rotatable on the outer surface of the elongate toque shaft to align the core bit to the substrate and slidable on the outer surface to traverse the core bit along the length of the shaft; a transmission attachable to a motor for transmitting power from the motor to an output of the transmission, the output of the transmission coupled to the core hit for imparting rotation of the core bit about the elongate torque shaft; a key fixed to the transmission and slideably disposable within the groove of the elongate torque shaft to prevent rotation of the transmission and/or motor about the torque shaft during rotation of the core bit.