Abstract: The present invention relates to an ordinary pulley whose pintle is born by a shell provided with a device for suspension from a fixed point and which is adapted to receive a handling or hauling rope, said shell further comprising an auxiliary braking system independent of the pulley, in which said rope is engaged only when the device is to be used as a rescue device for lowering persons, particularly injured or unconscious persons.

Abstract: A voltage detector apparatus comprises a thin, cylindrical, electrically-insulative casing having an angled, finger-like probe extending axially from one end, and providing accommodation for active and other components which are assembled on a support which fits into the casing and screw-threadedly engages with the casing at its other end. The support is of electrically-insulating material and has two end portions which are spaced apart from one another by a hollow hub. The end portions accommodate active circuit components adjacent the probe end of the casing, and a buzzer or like warning device adjacent the other end of the casing. The hub is externally shaped to define with the casing recesses for accommodating batteries for powering the apparatus, and has a hollow core within which is mounted an electrical switch. The switch is operated by depressing the buzzer, which is formed as a modular unit, against spring bias, the buzzer unit being accessible for this purpose from the end of the casing.