Abstract: A first pole of a double pole switch selectively connects a battery to a motor in one switch condition and disconnects the motor and battery in a second switch condition, wherein a second switch pole connects a dynamic braking circuit around the motor. In the event contacts of the first pole weld closed and fail to open in the second switch condition, the second pole connects the fuse directly to the battery in shunt of the motor to cause the fuse to blow and open the circuit to the motor. Alternative embodiments incorporate time delays between switch operation and blowing of the fuse by incorporating a thermistor or an R-C timing circuit.

Abstract: A pair of disc-shaped flanges having centrally located arbor holes defining an axis for the reel are axially spaced by a plurality of collapsible strut assemblies affixed to the flanges at opposite ends and split at their mid-portion, joined at such split by a lost motion pivotal connection. Hinges are provided the strut assemblies proximate the flanges to provide an articulated assembly which folds radially outward. Clamping means adjacent the hinges hold the assembly rigid in an empty but extended position of the reel. Bolts are provided between the flanges to lock the reel in a collapsed condition. A transportation fixture comprises an upright spindle on a platform over which the collapsed reels are stacked, arbor holes of the reels receiving the spindle. Securing means clamps the stack of collapsed reels to the platform.

Abstract: A multiple leaf spring interlock switch having a pair of contacts in each side of an A.C. supply inherently biased to open positions and operated to closed positions by a linearly reciprocably movable cam acting only against the biased of the contacts. A latch is operable to alternately latch and release the cam on successive operations to hold the contacts closed or released. An interlock system has plural slides coupled to a rotary cam which is in turn coupled to a lock member to block movement of the linearly movable cam when either slide is in a non-operated position and to release the latch when a slide is moved to a non-operated position while the cam is latched, such action also causing the rotary cam to separate the contacts. An energy storage and release mechanism provides non-reversible momentum for a depressible operation.

Abstract: A molded insulating housing is received in a slot in a rear panel of a removable control unit to extend on front and rear sides of the panel. Solid bus conductors mounted in the housing have their opposite ends disposed within front and rear openings in the housing. Plug-in connector clips are affixed to the solid bus conductors adjacent the rear openings for plug-in connection with control center vertical bus bars. The solid bus conductors are afforded limited transverse sliding movement within the housing relative to the vertical bus bars for self-alignment of the plug-in connector clips with the bus bars. Bolted connection of the solid bus conductors to control apparatus is effected at the front of the control unit using a solid preformed connector strap.

Abstract: A power interruption protection system for AC electric motors. An electroresponsive relay (OL) in the energizing circuit of an electroresponsive main power contactor (MC) for an AC motor is responsive to deliberately deenergize the contactor if a power supply interruption persists for more than a few cycles of the supply frequency. A motor current level detector (CLD) monitors the motor current and if it falls below a predetermined level activates a pulse counter (CTR) to register pulses from a clock pulse generator (CPG) which produces pulses each half cycle of the supply frequency. If the pulse counter registers a certain number or more of such pulses an amplifier-driver (AD) energizes the relay to effect disconnection of the motor from the AC supply. The system is disclosed both as a stand-alone system, and as combined in a system affording current overload protection modes as well for AC motors.