Abstract: An electrical receptacle has a stationary terminal bracket at each blade opening and a spring loaded center contact pressure element which deflects as the blades of a plug are inserted. A push button snap switch is mounted to the back of the receptacle and is operated by the contact pressure element as a plug is inserted or removed from the receptacle. The spring loaded biasing of the center cntact pressure element is non-conductive and isolated from the electrical circuit of the receptacle.

Abstract: An electronic circuit for automatically disconnecting a start winding of an electric motor after a predetermined time delay is suitable for use in instantly reversing applications and provides timed disconnection of the start winding upon substantially instantaneous reconnection of the motor for reverse rotation. The circuit includes a triac and full wave bridge, the full wave bridge providing full wave rectified D-C to a timing circuit and a resetting circuit. The resetting circuit utilizes a PUT which switches at the gate lead of an SCR in the timing circuit to de-energize it and permit discharge of the timing voltage accumulated during a timed start cycle. A capacitor and resistor in series with the PUT maintain the current therethrough to prevent turn-off during the valley portion of the rectified D-C supply.

Abstract: A battery charger has a control circuit portion and a power circuit portion with common terminals to connect to a battery desired to be recharged, the power circuit includes a transformer and rectifier to deliver at least partially rectified A-C current to the battery, and an A-C power connection through which A-C power is supplied to the power circuit with the control circuit having a solid state switch to selectively connect the A-C power to the power circuit portion. The control circuit portion of the charger has a D-C disconnect feature which senses the interruption in the electrical circuit between the charger's terminals and the battery, said disconnect feature causing the operation of the A-C power switching device to disconnect the A-C power from the power circuit after the terminals have been disconnected.

Abstract: A battery charger control device which senses the placement of a battery across control terminals and utilizes the voltage thereof to place into conduction a transistor which actuates a relay which turns on a battery charger, which thereafter, monitors the the charge condition of the battery as determined by the voltage supplied to a voltage following circuit from the control terminals, and which actuates an electronic switch after the elapse of a predetermined period of time after the battery has attained a fully charged condition as determined by the voltage of the battery as presented to the voltage following circuit.

Abstract: A battery charger control device which senses the placement of a battery across charging terminals and utilizes the voltage thereof to actuate a relay which turns on a battery charger, which utilizes a pulse generator to charge a capacitor over a period of several hours after the battery has been placed across the terminals, which monitors the charge condition of the battery as determined by the voltage across the terminals and which automatically and independently of the pulse generator applies charging current to the capacitor after the voltage across the terminals exceeds an adjustably preselected magnitude, and which utilizes the charge condition of the capacitor to turn off the battery charger after the lapse of a predetermined period of time or after the battery has become fully charged, whichever occurs first.