Electrical control for hydraulic waste compactor

Claim 2

In a hydraulic waste compactor comprising a hydraulic cylinder, a hydraulic pump driven by an electric motor, a reversing valve and a hydraulic flow responsive magnetic spool connecting said pump to said cylinder for controlling a movable element within said cylinder, and an electrical circuit comprising a pair of magnetically actuated switches along opposite ends of said spool for controlling a solenoid coil for said valve and a relay coil for said motor, the improvement of one side of each of said switches being adapted to be connected to one side of a source of A. C. electrical power, a pair of 1/2 wave rectifying diodes connected to the other sides of said switches and to one end of said relay coil, one end of said solenoid coil being connected to a point between one of said switches and diodes, and the remaining ends of said coils being adapted to be connected to the other side of said source of electrical power.

Claim 3

In a hydraulic actuator comprising a piston in a cylinder and a hydraulic pump driven by an electric motor, said pump being connected to opposite ends of said cylinder by a pair of hydraulic lines through a reversing valve to reciprocate said piston, a bi-directional hydraulic flow and pressure responsive controller for controlling said valve and motor, said controller being connected in one of said lines and comprising a cylindrical housing having line connecting fittings at opposite ends thereof, a slidable magnetic spool in said housing, an axially extending passageway formed in said spool whereby pressurized liquid entering either one of said fittings is adapted to simultaneously pass through said spool and drive said spool towards the other fitting, a pair of springs acting at opposite ends of said spool to center position the same in said housing, and a pair of magnetically responsive switches being electrically connected to said reversing valve and motor and being responsive to movement of said spool from its center position towards either of said fittings, the improvement of a relay coil for said motor, a solenoid coil for said valve, and a pair of diodes connected in electric circuit with said switches for controlling said motor and valve, said circuit including said diodes being electrically connected to one side of each of said switches and to one end of said relay coil, the other side of said switches being connected to one side of a source of A. C. electrical power, the other end of said relay coil and one end of said solenoid coil being electrically connected to the other side of said source of electrical power, and the remaining end of said relay coil being electrically connected to a point between one of said switches and diodes.

Claim 4

In a hydraulic actuator comprising a piston in a cylinder and a hydraulic pump driven by an electric motor, said pump being connected to opposite ends of said cylinder by a pair of hydraulic lines through a reversing valve to reciprocate said piston, a bi-directional hydraulic flow and pressure responsive controller for controlling said valve and motor, said controller being connected in one of said lines and comprising a cylindrical housing having line connecting fittings at opposite ends thereof, a slidable magnetic spool in said housing, an axially extending passageway formed in said spool whereby pressurized liquid entering either one of said fittings is adapted to simultaneously pass through said spool and drive said spool towards the other fitting, a pair of springs acting at opposite ends of said spool to center position the same in said housing, and a pair of magnetically responsive switches being electrically connected to said reversing valve and motor and being responsive to movement of said spool from its center position towards either of said fittings, the improvement of a relay coil for said motor, a solenoid coil for said valve, and a pair of diodes connected in electric circuit with said switches for controlling said motor and valve, said circuit including said diodes being electrically connected to one side of each of said switches and to one end of said relay coil, the other side of said switches being connected to one side of a source of A. C. electrical power, the other end of said relay coil and one end of said solenoid coil being electrically connected to the other side of said source of electrical power, and the remaining end of said relay coil being electrically connected to a point between one of said switches and diodes.