Flexible shaft and roof drilling system

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

1978-10-02

1981-09-22

Feldbaum, Ronald

Tool driving or impacting

Advance causing or controlling means

Tool advances relative to drive

64 2R, 173160, B23Q 500, E21C 500

Patent

active

042904943

ABSTRACT:
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 convolutions 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 expands outwardly and the outer spring contracts inwardly to form a relatively rigid shaft.

REFERENCES:
patent: Re25543 (1964-03-01), Rugg et al.
patent: 177490 (1870-05-01), Baulieu
patent: 434748 (1890-08-01), Almond
patent: 1952301 (1934-03-01), Webb
patent: 2917909 (1959-12-01), Josutis
patent: 3000197 (1961-09-01), Rugg et al.
patent: 3146576 (1964-09-01), Wezel
patent: 3388505 (1968-06-01), Dreiling
patent: 4057115 (1977-11-01), Blanz

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