Abstract: A ground clamp having a clamping strap formed of a corrosive-resisting material with a series of uniformly sized and spaced apertures to facilitate the installation of the clamping strap and clamp onto a wide range of pipe, rod or conduit diameters. A tightening stud, through which the clamping strap is secured about the object to be grounded, includes a terminal portion having a slot therein to receive and have secured thereto one or more terminated ground wires. A pair of curved plates are adjustably positionable along the stud to form a tight clamping action of the clamping strap about the object to be grounded without subjecting the strap to localized stresses or damage. An abrading sleeve is carried by the clamping strap, and positioned thereon to engage the outer surface of the pipe, rod or conduit to be grounded.

Abstract: A collapsible cable or wire spool stand which, when erected, provides a stable platform about which a spool of cable or wire material can be supported to permit the withdrawal of cable or wire contained on the spool. The support structure may be readily collapsed from its erected configuration to minimize storage space. In a collapsed configuration, the horizontally disposed axle, upon which the spool is supported functions as a convenient handle to form a convenient handle for carrying the spool support stand.

Abstract: A universal ground clamp having a clamping strap formed of a corrosive-resisting copper or copper alloy having a series of uniformly sized and spaced apertures to facilitate the installation of the clamp onto a wide range of pipe, rod or conduit diameters. A brass stud, through which the clamping strap is secured, includes a terminal portion adapted to accommodate and have secured therein a terminated ground wire. A pair of curved plates supported upon the stud are used to form a tight clamping action of the copper strap about the pipe, rod or conduit to be grounded, without subjecting the strap to localized stresses or tearing, but permitting the strap to tightly encircle the pipe, rod or conduit and to be folded upon itself in a convergingly parallel manner.

Abstract: An electronic locking device having a key unit and lock unit which units each have substantially identical integrated circuits contained therein for electronically controlling the operation of the locking device. The integrated circuit in the key element is adapted to transmit a stream of pulses into a plurality of trains of pulses upon insertion of the key unit into the lock unit. Each train of pulses is of a predetermined length. The integrated circuit in the lock unit is adapted to receive the train of pulses emitted from the key unit, to determine the length of the train of pulses, and compare the length of the train of pulses received to determine whether such train length coincides with the predetermined length. The integrated circuit in the lock unit will then emit a signal to allow the lock unit to open. If the length of the train of pulses does not coincide with the predetermined length, the lock unit integrated circuit will not emit a signal and the locking device will remain locked.

Abstract: The present invention relates generally to security systems, and more particularly, to low cost, highly reliable mechanical-electronic locking units. The electronic security devices of the invention physically include a key assembly, a receptacle for the key in a door or other secured device, a receiver for decoding the signal sent from the key, and a novel electromechanical locking-and-unlocking component which is actuated electrically in response to an appropriate signal from the receiver.