Tool driving or impacting – Impacting devices – Length of cyclic travel of hammer head selectively adjustable
Patent
1977-02-09
1978-05-02
Staab, Lawrence J.
Tool driving or impacting
Impacting devices
Length of cyclic travel of hammer head selectively adjustable
91277, B25D 900
Patent
active
040869687
ABSTRACT:
In a pile driving hammer including a striker elevatable on guides by fluid pressure delivered to an operating fluid cylinder, and capable of being dropped to deliver a pile driving blow by exhausting fluid from the cylinder, a control system for the cylinder including a first cam carried by the striker and operable to cause delivery of fluid to the cylinder at the lower end of the stroke of the striker, a plurality of second cams carried by the striker and operable to cause exhaust of fluid from the cylinder at respectively different elevations of the striker, and remotely controlled apparatus for activating any selected one of the second cams.
REFERENCES:
patent: 1093210 (1914-04-01), Schalscha
patent: 1226272 (1917-05-01), Sturtevant
patent: 1917066 (1933-07-01), Schalscha
patent: 2885862 (1959-05-01), Smith
patent: 3357315 (1967-12-01), Adams et al.
patent: 3566977 (1971-03-01), Wandell
Conmaco, Inc.
Hamilton John A.
Staab Lawrence J.
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