Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1975-12-09
1977-05-31
Shapiro, Jacob
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
61 63, 173 49, E21C 1102, E21D 2000
Patent
active
040261166
ABSTRACT:
A roof pin-or-bolt setting machine which applies sonic energy to drive bolts which may be of non-circular section or helical into the roof of a coal mine. The energy is supplied by a bar which is set into sonic vibration in its bending mode so that there is a standing wave along the bar having nodes and anti-nodes. The bolt is supported vertically at an anti-node position of the bar and is driven into the roof as the bar is vibrated. Continuous vertical force is applied to the bar to maintain the bolt in engagement with the roof under pressure.
REFERENCES:
patent: 3431988 (1969-03-01), Bodine, Jr.
patent: 3454070 (1969-07-01), Phipard, Jr.
patent: 3664459 (1972-05-01), Stephens et al.
patent: 3842610 (1974-10-01), Willis et al.
patent: 3942329 (1976-03-01), Babcock
Fulmer Donald W.
Kneisley Joel D.
Lasser Ronald
Lenden Angela L.
Mutschler Thomas A.
Carnegie-Mellon University
Diamond Hymen
Shapiro Jacob
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