B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
138/40, 138/92
B25D 9/12 (2006.01) B25D 9/20 (2006.01) B25D 17/24 (2006.01)
Patent
CA 1188200
ABSTRACT OF THE DISCLOSURE A linear actuator includes a ram and a piston separated by a column of hydraulic fluid in a housing. Upward movement of the ram in the housing first seals a finite quantity of hydraulic fluid in the housing cavity. Continued upward ram movement then causes the piston, and hydraulic fluid beneath it, to move upwardly into a sealed gas chamber to compress a gas and create a source of potential energy. Release of the force moving the ram upwardly permits the compressed gas above the piston to expel the hydraulic fluid from the chamber against the ram thereby converting the potential energy in the compressed gas into kinetic energy in the ram. The hydraulic fluid bears directly against the ram to provide the working stroke of the impact device without the effect of metal fatigue from direct contact between the piston and ram. BACKGROUND OF THE INVENTION This invention relates to hydraulic hammers of a type used to break up concrete, street pavement, building walls and the like. More particularly, it relates to a linear actuator for providing the impacting force on the moil of hydraulic hammers and similar impact devices. Even though this invention relates specifically to an actuator for impact devices, it might be useful to understand the construction and operation of an impact device per se, such as a hydraulic hammer. Accordingly, reference is made to my United States Patent No. 4,231,434 dated November 4, 1980. -1-
409221
Hughes Tool Company
Ridout & Maybee Llp
LandOfFree
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