Title: Pile driver

Abstract: The driving power and driving rate of a pile driver hammer is increased without increasing the overall weight of the hammer through the use of a hydraulic spring transformer which is disposed between the ram and the pile in the housing of the hammer and presents a Q at the frequency where the mass of the ram and the stiffness of the hydraulic spring are in resonance which is less than about one.

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Inventors: Bouyoucos, John V. (Rochester, NY, US)

Application Number: 856059
Filing Date: 1977-11-30
Publication_date: 1980-02-12
Assignee: Hydroacoustics, Inc. (Rochester, NY)
Primary Class(es): 173/131 173/200
Other Classes:
US Patent Ref:

886193	Apr, 1908	DeWitt	173/131.
1039369	Sep, 1912	Eichler	173/131.
2373972	Apr, 1945	Moreno	173/139.
2388877	Nov, 1945	Souter	173/116.
2951345	Sep, 1960	Lang	173/131.
3205790	Sep, 1965	Bollar	173/116.
3250335	May, 1966	Joelson	173/116.
3382932	May, 1968	Wise	173/135.
3498391	Mar, 1970	Guild et al.	173/131.
3570609	Mar, 1971	Wise	173/131.
3595324	Jul, 1971	Guild et al.	173/131.
3662843	May, 1972	Wise	173/131.
3797585	Mar, 1974	Ludvigson	173/131.
3897835	Aug, 1975	Frederick	173/131.
4121671	Oct, 1978	West	173/139.

Other Refs: 467165

Oct, 1975	SU

Primary Examiner: Staab, Lawrence J.
Assistant Examiner:
Attorney: LuKacher; Martin