Motor driven hydraulic tool with variable displacement hydraulic pump
AssigneesBurndy Corporation, Hydro Rene Leduc
InventorsGeorge T. Heskey, Louis-Claude Porel, William Michel
Life of this patent
Estimating the term…
Abstract
A hydraulic drive system for a battery operated portable compression tool. The tool has an electric motor. The drive system has a self-regulating variable displacement pump with a rotatable conduit frame having radial conduits, pistons reciprocally located in the conduits, and a ring bearing surrounding the conduit frame in an eccentric adjustable location. Ends of the pistons are located against the inside of the ring bearing. A valve plate located against a front end of the rotatable conduit frame to control entry and exit of fluid into and out of the conduit frame as it is rotated.
Claims18
In a portable compression tool having a working head, an electric motor, and a hydraulic drive system operably connecting the electric motor to the working head, the improvement comprising:
- the hydraulic drive system having a self-regulating variable displacement pump with means for allowing the electric motor to operate at a substantially constant speed regardless of an increase in hydraulic pressure in the hydraulic drive system.
In a hydraulic tool having a working head, an electric motor, and a hydraulic drive system, the improvement comprising:
- the hydraulic drive system having a pump with a rotatable conduit frame directly connected to a drive shaft of the electric motor and a plurality of piston members movably located in radial conduits of the conduit frame, wherein the piston members are rotated with the conduit frame and are reciprocally moved in the radial conduits as the conduit frame is rotated to thereby pump hydraulic fluid through the conduit frame.
In a portable compression tool having a working head, an electric motor, a battery, and a hydraulic drive system, the improvement comprising:
- the hydraulic drive system having a rotatable piston ring, a plurality of piston members located adjacent to an interior side of the piston ring and projecting towards each other, and a rotatable conduit frame connected to the motor and located inside the piston ring, the conduit frame having a plurality of inwardly extending radial piston conduits, the piston ring and the conduit frame being located in parallel non-concentric axes of rotation such that rotation of the conduit frame causes the pistons to reciprocally move in the piston conduits.
Dependencies are inferred from the claim text.