Title: Impact tool

Abstract: A hydraulic impact tool wherein hydraulic power is used to lift a ram against a bias to store energy and wherein the ram then is permitted to accelerate toward an impliment to which it imparts energy upon impact. A reciprocating cylindrical sleeve slidable about the ram is arranged to control the hydraulic fluid. The sleeve is initially carried in each direction by the ram and is shifted relative to the ram by hydraulic power.

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Inventors: Barthe, Henry P. (Pittsburgh, PA, US)
Schroeder, John S. (Sewickley, PA, US)

Application Number: 561419
Filing Date: 1975-03-24
Publication_date: 1977-03-15
Assignee: Schroeder Brothers Corporation (Pittsburgh, PA)
Primary Class(es): 91/286 91/165, 91/320, 91/328, 91/329, 92/134
Other Classes:
US Patent Ref:

53613	Apr, 1866	Henderson	91/286.
518026	Apr, 1894	Drewett	91/286.
3236441	Feb, 1966	Russell	91/286.
3739863	Jun, 1973	Wohlwend	92/13.
3774502	Nov, 1973	Arndt	91/321.
3827507	Aug, 1974	Lance	91/276.
3896889	Jul, 1975	Bouyoucos	91/321.

Other Refs:
Primary Examiner: Maslousky, Paul E.
Assistant Examiner:
Attorney: Webb, Bunden, Robinson & Webb