Pile driver

Details Pile driver Pile driver

1977-11-30

1980-02-12

Staab, Lawrence J.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

173116, 173139, B25D 900

Patent

active

041879171

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.

REFERENCES:
patent: 886193 (1908-04-01), DeWitt
patent: 1039369 (1912-09-01), Eichler
patent: 2373972 (1945-04-01), Moreno
patent: 2388877 (1945-11-01), Souter
patent: 2951345 (1960-09-01), Lang
patent: 3205790 (1965-09-01), Bollar
patent: 3250335 (1966-05-01), Joelson
patent: 3382932 (1968-05-01), Wise
patent: 3498391 (1970-03-01), Guild et al.
patent: 3570609 (1971-03-01), Wise
patent: 3595324 (1971-07-01), Guild et al.
patent: 3662843 (1972-05-01), Wise
patent: 3797585 (1974-03-01), Ludvigson
patent: 3897835 (1975-08-01), Frederick
patent: 4121671 (1978-10-01), West

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