Impact tool

Details Impact tool Impact tool

1978-01-05

1980-01-01

Staab, Lawrence J.

Tool driving or impacting

Impacting devices

With means to cause or control advance of hammer head

91300, 173134, 173DIG4, B25D 900

Patent

active

041811836

ABSTRACT:
An improved impact tool which has a cylinder, a liner mounted therein, a piston mounted in the liner and reciprocated by gas and hydraulic pressure, and a tubular valve slidably mounted on the liner for controlling a hydraulic circuit. The tubular valve is hydraulically pushed up and down without a spring being used. No gas accumulator is used. Thus, the impact tool has a simple construction and is durable.

REFERENCES:
patent: 3213615 (1965-10-01), Bjornberg
patent: 3411592 (1968-11-01), Montabert
patent: 3766830 (1973-10-01), Montabert
patent: 3827507 (1974-08-01), Lance
patent: 3866690 (1975-02-01), Lance et al.
patent: 3916764 (1975-11-01), Crover
patent: 3955478 (1976-05-01), Feucht
patent: 4039033 (1977-08-01), Salmi

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