Hydraulic pile driver

Details Hydraulic pile driver Hydraulic pile driver

1987-03-30

1989-04-04

Yost, Frank T.

Tool driving or impacting

Automatic control of power operated means

173 21, 173115, B21J 708

Patent

active

048177334

ABSTRACT:
In a hydraulic pile driver (10), the lifting cylinder (34) acting on the driving weight (12) has an attached position indicator (46, 50), which produces a signal corresponding to the momentary position of the piston rod (32) of the lifting cylinder (34). This signal is used for reversing a 4/3-valve, by which the two working chambers of the lifting cylinder can be connected to a pressure line or return line.

REFERENCES:
patent: 4156467 (1979-05-01), Patton et al.
patent: 4271475 (1981-06-01), Sahajdak

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