The Robbins Company

Other

Barry A Spencer

Richard J Robbins

James P Crivello

Spinal exercising apparatus, also referred to as a spinal exercising table, is arranged to support a person, while he or she applies forces, via his or her head, as his or her body is actively supported on an angularly adjustable table, movably positioned and then selectively secured on a frame to then be above floor level. Pivotally secured to the frame adjacent an end of the table is a resistive force mechanism to receive his or her head applied forces and to then provide a substantially uniform opposing force throughout a selected range of arcuate exercising motions, which result in a person being able to completely and thoroughly exercise his or her entire spine. Optionally, other apparatus is secured to the frame and/or table to serve the person in performing other exercises, to accomplish, if desired, a total body workout.

Spinal exercising apparatus

A main frame includes an annular beam by which the cutterhead is mounted onto an earth boring machine for a rotation about an axis of rotation. A plurality of radial spoke beams extend generally vertically at the front of cutterhead and curve rearwardly to intersect with the annular beam. Each radial spoke beam is constructed from a pair of spaced apart side plate members which define spaces between them for receiving a plurality of roller cutter mounts therebetween. Roller cutters, including gauge cutters, can be installed and removed from their associated cutter mounts from the rear side of the cutterhead. A plurality of generally radially elongate cut-ground-material passageways extend through the cutterhead in the regions between the radial spoke beams. A plurality of concentric, substantially circumferentially continuous face-support-ring members are located forwardly of the cutterhead main frame but rearwardly of the peripheral cutting edges of the cutters in at least the radial region of cutterhead in which the cut-ground-material passage ways are located. During rotation of the cutterhead, face-support-ring members support fractured material against the face of the tunnel while the roller cutters cut concentric kerfs with such material.

Rotary cutterhead for an earth boring machine

The main frame of the cutterhead comprises a plurality of radial spoke beams which are interconnected between a box-like hub structure and an annular box beam by which the cutterhead is mounted for rotation. Cutter mounting wells are defined by and between side wall portions of the radial spoke beams. The mined material passes rearwardly through the cutterhead via openings between adjacent radial spoke beams and open spaces in the cutter mounting wells. Cutter mounts span laterally between the side plate members and laterally brace the radial spoke beams in addition to mounting the cutters. The radial spoke beams curve rearwardly at their outer ends and connect to the annular box beam at a location spaced enough rearwardly from the front portions of the spoke beams that a room is defined within the cutterhead. Roller type cutters are installed onto and removed from the cutterhead frame from the rear side of the cutterhead.

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Redmond, WA, United States of America

Barry A Spencer