Support and positioner for rock drill

Details Support and positioner for rock drill Support and positioner for rock drill

1978-09-12

1980-02-26

Staab, Lawrence J.

Tool driving or impacting

Drive by means reacting to rotating eccentric mass

173 38, 248654, E21C 500

Patent

active

041901177

ABSTRACT:
A support and positioner for a rock drill has an extendable and retractable feed boom pivoting about a pivotal support arranged laterally below the axis of the feed boom, so that when the boom is swung downwardly to maintain a desired line of advance of the drill, the boom rocks forwardly so as to increase axial drilling thrust and the extent of forward movement of the drill, and reduce the bending stresses imposed on the drill steel.

REFERENCES:
patent: 2638326 (1953-05-01), Lehner
patent: 2828109 (1958-03-01), Dellner
patent: 3075754 (1963-01-01), Bles
patent: 3185222 (1965-05-01), O'Leary
patent: 3462103 (1969-08-01), Strom
patent: 3470969 (1969-10-01), Arcangeli
patent: 3590930 (1971-07-01), Gronfors
patent: 3604521 (1971-09-01), Collins
patent: 3724559 (1973-04-01), Stromnes
patent: 3980142 (1976-09-01), Grigorien et al.
patent: 3999805 (1976-12-01), Lockwood
patent: 4000873 (1977-01-01), Wallace
patent: 4022410 (1977-05-01), Ewart et al.

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