Hydraulically operated impact devices

Details Hydraulically operated impact devices Hydraulically operated impact devices

1977-11-30

1979-05-22

Maslousky, Paul E.

Motors: expansible chamber type

Cyclically operable

With dwell

91321, 91337, F01B 718, F01L 2506

Patent

active

041552873

ABSTRACT:
Hydraulic actuation of a device for delivering impact energy to a load, such as a pile driver, is provided by a hydraulically operated oscillator having a piston which is reciprocal in a cylinder under hydraulic forces developed by pressurized hydraulic fluid in the cylinder which is switched from supply to return pressure by a valve. The valve is actuated between switching positions by means of trip ports opened and closed by spaced flats on a rod which connect the piston to an impact delivering member, such as the ram of the pile driver. The trip ports are connected to the valve for applying pressurized hydraulic fluid either at supply or return pressure thereto so as to shift the valve between the switching positions. The valve is bi-stable in either of its switching positions through the use of latching ports and restricted passageways through which hydraulic fluid flows in amounts sufficient to make up for leakage through the valve which would otherwise allow the valve to drift.

REFERENCES:
patent: 3376791 (1968-04-01), Ashfield et al.
patent: 3513917 (1970-05-01), Stober
patent: 3540349 (1970-11-01), Pennther
patent: 3643548 (1972-02-01), Butterworth
patent: 4020744 (1977-05-01), Swenson

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