Motors: expansible chamber type – Cyclically operable – Working member controlled motive fluid for distributor motor
Patent
1987-08-07
1989-01-31
Garrett, Robert E.
Motors: expansible chamber type
Cyclically operable
Working member controlled motive fluid for distributor motor
91308, 91321, F01L 2502, F01B 718
Patent
active
048007978
ABSTRACT:
A hydraulic percussion device comprises a housing defining a longitudinal cylinder, a piston longitudinally reciprocal in the cylinder and subdividing same into a front compartment and a rear compartment, and a tool engageable longitudinally with the piston at the front compartment. The compartments are alternately and oppositely hydraulically pressurized to move the piston forward to strike the tool while traveling at an end speed and to move the piston backward away from the tool, the rate of alternation being a frequency parameter and the speed being a force parameter. A controller varies at least one of the parameters by detecting how much the piston rebounds from the tool after striking same and operating the control means in accordance with how much rebound is detected. How much the piston rebounds can be detected by sensing the pressure in one of the compartments immediately after the piston strikes the tool. As rebound increases the pressure in the rear compartment increases relative to a set point or pressure in the front compartment decreases relative to a set point, and vice versa. Rebound can also be detected by sensing the pressure in one of the compartments and at one of the sides of the source and operating the control means in accordance with the differential between these sensed pressures.
REFERENCES:
patent: 3552269 (1971-01-01), Arndt
patent: 3780621 (1973-12-01), Romell
patent: 4172411 (1979-10-01), Matsuda et al.
patent: 4244274 (1981-01-01), Oguni
patent: 4413687 (1983-11-01), Eklof
Dubno Herbert
Etablissements Montabert
Garrett Robert E.
Wilford Andrew
Williamson Mark A.
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