초록 ▼

A three position electrically operated actuator has a self centering system so that if power is off for the actuator, it returns to a central position. The actuator comprises a center cavity with a first solenoid on one side and a second solenoid on the other side, a shaft extends through the center

A three position electrically operated actuator has a self centering system so that if power is off for the actuator, it returns to a central position. The actuator comprises a center cavity with a first solenoid on one side and a second solenoid on the other side, a shaft extends through the center cavity and is joined to a first magnetic core of the first solenoid and a second magnetic core for the second solenoid. The shaft has a connection at least at one end for connection to a gearbox or the like. When the first solenoid is energized the shaft moves axially in one position so the connection is at a first position, when the second solenoid is energized, the shaft moves axially in the opposite direction so the connection is at a second position. A coil spring is provided in the cavity, and when neither solenoid is energized the spring moves the shaft so the connection is in a third position midway between the first position and the second position.

대표청구항 ▼

A three position electrically operated actuator comprising: a center cavity with a first solenoid on one side and a second solenoid on the other side; a shaft extending through the center cavity and joined to a first magnetic core of the first solenoid and a second magnetic core of the second soleno

A three position electrically operated actuator comprising: a center cavity with a first solenoid on one side and a second solenoid on the other side; a shaft extending through the center cavity and joined to a first magnetic core of the first solenoid and a second magnetic core of the second solenoid, the shaft having connection means at least at one end; the first solenoid when energized adapted to move the shaft axially in one direction to position the connection means at the end of the shaft in a first position; the second solenoid when energized adapted to move the shaft axially in the opposite direction to position the connection means at the end of the shaft in a second position; single coiled spring extending between two walls of the center cavity; two tubular collars positioned about the shaft and extending through apertures in the walls of the cavity; a flange on each collar, the flange having substantially the same diameter as the coiled spring, the flange positioned on each end of the coiled spring between the end of the spring and the wall; each flange compressing the coiled spring when the shaft is moved axially to locate the connection means in the first position or the second position; and upon deactivation of the solenoids, the coiled spring pushes each flange into contact with the walls of the center cavity to move the shaft so the connection means at the end of the shaft is moved to a third position midway between the first position and the second position.