Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1985-04-01
1986-04-08
Yost, Frank T.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
173 82, 254276, E21B 500
Patent
active
045806403
ABSTRACT:
A pickup is connected to a system of sheaves of a mobile hydraulic hammer for providing a signal proportional to velocity of a hammer weight. The pickup is connected to the input of a differentiating circuit, and the output of the differentiating circuit is connected to the starting input of an electronic timer. Two-level output of the timer is connected to hydraulic valves that control the lifting and dropping of a hammer weight. The signal applied to the starting input of the timer has two states, one state resulting from any noticeable acceleration of the hammer weight and the other state resulting from zero acceleration. The timer starts in response to zero acceleration at the time of impact of the hammer weight and provides a signal to cause the hammer weight to be lifted without delay to a predetermined height according to a predetermined timing period, the height always being with reference to the level at which impact occurred. At the end of the timing period, the timer provides the other one of two signals to cause the hammer weight to drop.
REFERENCES:
patent: 2660404 (1953-11-01), Meier
patent: 2742267 (1956-04-01), Meier
patent: 3938595 (1976-02-01), Swenson
patent: 4058175 (1977-11-01), Holland
Antrim Glenn H.
East Moline Metal Products Company
Phan Hien H.
Yost Frank T.
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