Tool driving or impacting – Processes
Patent
1977-06-03
1978-11-21
Staab, Lawrence J.
Tool driving or impacting
Processes
173127, 173135, 173DIG1, 405228, B25D 900
Patent
active
041261917
ABSTRACT:
An underwater hammer, of the gas discharge type, is provided with a surrounding casing arranged in the nature of a diving bell from which liquid can be purged so that the hammer ram may move up and down with minimum resistance. A reflood tube extends down through the upper end of the casing and opens into an axial reflood passageway in the ram and liquid is pumped through this tube to obtain reflooding after each cycle of operation.
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patent: 4060139 (1977-11-01), Adair
Gendron George J.
Holland Henry A. Nelson
Raymond International Inc.
Staab Lawrence J.
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