An electric circuit breaker capable of being opened and closed from a remote location. The circuit breaker includes a stationary contact, a movable contact mounted on a carrier and a trip mechanism that trips the circuit breaker, moving the carrier to an open position upon the occurrence of an overcurrent. The remote control assembly opens and closes the circuit breaker independently of the trip mechanism. Upon receiving a signal from a timer switch, a motor operates, rotating a gear spring connected to the motor shaft. An actuator has a tooth positioned between the wire layers of the gear spring. As the gear spring rotates, the tooth moves toward the motor, pivoting the actuator. An operating rod, connected to both the actuator and the carrier, pulls the carrier to open the contacts as the actuator rotates. When the contacts reach the open position, the actuator hits a switch to shut off the motor.

A remotely controllable circuit breaker device for interrupting power in a circuit path between a source and a load includes local and remote monitoring capabilities and a worm-gear mechanism for reliable control of the interruption mechanism. The device includes a first contact and a second contact cooperatively arranged in the circuit path so as to provide current from the source to the load. At least one of the contacts are movable for interrupting the power provided to the load. The worm gear mechanism includes a motor with a rotatable shaft which responds to open and closed control signals generated from a remote location, and a gear, rotatably responsive to the rotatable shaft, for controlling the movable contact so that the circuit path is interrupted and established, respectively. The worm gear mechansim controls the movable contact using a coupling arrangement, which has a first part coupled to the movable contact and a second part coupled to the gear.

A pumping device in connection with saw chain lubrication, especially in connection with a hand-held device, e.g. a chain saw, the pumping device including a pumping house, a piston that is received in the pumping house and means to bring the piston to rotate and simultaneously perform a reciprocating motion in its longitudinal direction, the means including on one hand a worm pinion having means for driving cooperation with a prime mover and on the other hand a gear pinion mounted on the piston. The invention further relates to a worm pinion, preferably included in a device for saw chain lubrication. The invention is characterized in that the worm gear on one hand includes a spirally shaped element, prefabricated as a separate detail, and intended to cooperate with the gear pinion and on the other hand a sleeve shaped element that supports the spirally shaped element.

A circuit breaker configured to be remotely operated is disclosed. The circuit breaker includes a set of main contacts configured to connect between an electrical source and an electrical load, an operating mechanism in operable communication to open and close the main contacts, and a remotely operable drive system configured to open and close the main contacts separate from actuation of the operating mechanism. The drive system includes a motor responsive to first and second control signals, a primary drive responsive to the motor, and an opening spring responsive to the primary drive, the main contacts being responsive to the opening spring. In response to the first control signal, the primary drive moves to charge the opening spring, and in response to the second control signal and the main contacts being closed, the primary drive moves to allow the opening spring to discharge thereby resulting in the main contacts opening independent of the motor.