Abstract: Disclosed is a tubular tension bar adapted for insertion in the vertically aligned terminal links of a conventional chain link fence during installation of the fence. The bar is of oblong, tubular cross-sectional configuration, formed of galvanized steel, sealed at each end, and characterized by its improved strength and shaped to provide a curvature about its major cross-sectional axis to fit closely in the bight of the vertically aligned, U-shaped openings formed by the terminal links of the fence fabric.

Abstract: A current limiting circuit interrupter comprises a molded case, separable contacts disposed in the case, the contact arms supporting one of the contacts, an operating mechanism connected to the contact arm to move the arm between open and closed positions, and a slotted magnetic drive device generating electrodynamic force on the contact arm during extreme overcurrent conditions to rapidly separate the contacts. The magnetic drive device includes a molded housing forming a slot having insulated walls disposed about the contact arm, and a stack of U-shaped laminations of magnetic material fitted into the housing. The space between opposing walls of the housing is slightly less than the thickness of the lamination stack so that the laminations may be snugly press-fitted into the housing. The housing is then secured to the case in such a manner that the laminations are captured and securely positioned without the need for rivets or other fastening means extending through the lamination stack.

Abstract: A circuit interrupter includes an interchangeable trip unit removably disposed in the circuit interrupter housing and connected between a current transformer and a trip mechanism. The trip unit contains electronic circuitry for activating the trip mechanism to open the contacts upon detection of overload current therethrough and includes rejection means provided to ensure that only a trip unit having circuitry compatible with the electrical characteristics of the circuit interrupter can be inserted into the housing. The rejection means comprise a plurality of pins mounted within the housing and extending into the recess to be occupied by the trip unit. The pins are arranged in a pattern unique to all circuit interrupters having identical electrical characteristics. A pattern of holes is provided in the enclosure of the trip unit, the hole pattern being unique to trip units having identical electrical characteristics.

Abstract: A three pole molded case circuit breaker including a push-to-trip button, a flux transfer shunt trip mechanism, an undervoltage trip mechanism, and an improved latch mechanism. The latch mechanism comprises a metal trip bar covered with insulating tubing and adapted for translational movement to actuate the latch mechanism and trip the contacts. Contact carrier movement during the tripping operation serves to reset the latch mechanism.

Abstract: An apparatus for use on bicycles having a front brake, a rear brake, a left hand brake lever and a right hand brake lever wherein, regardless of whether the left or right hand brake lever is actuated, or both brake levers simultaneously, the rear brake of the bicycle is preferentially actuated such that the rear brake is applied first and with more force than the front brake. The apparatus includes a housing for mounting on the bicycle, a front brake actuator connected to a cable extending to the front brake and a rear brake actuator connected to a cable extending to the rear brake one of the actuators having two pulleys thereon, each of the cables from the brake levers looping around the pulleys and attaching to the other brake actuator, and including a spring applying a bias to resist the movements of the front brake actuator.