Flexible shaft and roof drilling system

Details Flexible shaft and roof drilling system Flexible shaft and roof drilling system

E - Fixed Constructions

21

B

255/24, 255/56

E21B 17/00 (2006.01) E21B 7/02 (2006.01) E21B 7/04 (2006.01) E21B 17/20 (2006.01) E21D 20/00 (2006.01) F16C 1/02 (2006.01)

Patent

CA 1112232

FLEXIBLE SHAFT AND ROOF DRILLING SYSTEM Abstract of the Disclosure A system for drilling holes in the roof of a mine has a flexible shaft with a pair of oppositely wound, coaxial flat bands. One of the flat bands defines an inner spring that is wound right handed into a helical configuration, adjacent con- volutions being in nesting relationship to one another. The other flat band defines an outer spring that is wound left handed into a helical configuration about the inner band, adjacent convolutions being nesting relationship with one another. A transition member that is configured to hold a rock bit is mounted to one end of the flexible shaft. When torque and thrust are applied to the flexible shaft by a driver, the inner spring ex- pands outwardly and the outer spring contracts inwardly to form a relatively rigid shaft.

335013

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