Portable raising and lowering device and equipment therefor

A raising and lowering device provided with a raising and lowering mechanism, an attachment element adapted to enable the device to be suspended from an elevated support, a load-carrying support adapted to support a load to be raised or lowered by said mechanism, a pair of vertically pivotable arms having proximal sections positioned adjacent each other, elongate sections extending therefrom said proximal sections terminating in distal sections, wherein said arms have elbow sections where said proximal end sections join said elongated sections, and wherein said elbow sections abut against each other when said arms are pivoted downward into an operating position, thereby preventing further downward pivotal motion of said arms, a drive input for said mechanism and a magnetic clutch between said drive input and said mechanism, said magnetic clutch being adapted to isolate said mechanism from said drive input when a load of more than a predetermined weight is carried by said load-carrying support and lifting of said weight is attempted.

A raising and lowering device provided with a raising and lowering mechanism, and a load-carrying support adapted to support a load to be raised or lowered by said mechanism, a pair of vertically pivotable arms having proximal sections positioned adjacent each other, elongate sections extending therefrom said proximal sections terminating in distal sections, wherein said arms have elbow sections where said proximal end sections join said elongated sections, and wherein said elbow sections abut against each other when said arms are pivoted downward into an operating position, thereby preventing further downward pivotal motion of said arms, wherein said raising and lowering mechanism includes a one-way roller bearing for an axle and an axle journaled in said bearing, said bearing allowing mutual rotation between said bearing and said axle in one direction consistent with raising of said load, but preventing mutual rotation in an opposite direction consistent with lowering of said load, thereby enabling said load to be raised to any desired elevation by operation of said raising and lowering mechanism and held at said elevation without lowering upon ceasing operation of said raising and lowering mechanism.

A raising and lowering device provided wit a raising and lowering mechanism, a load-carrying support adapted to support a load to be raised or lowered by said mechanism, a pair of vertically pivotable arms having proximal sections positioned adjacent each other, elongate sections extending therefrom said proximal sections terminating in distal sections, wherein said arms have elbow sections where said proximal end sections join said elongated sections, and wherein said elbow sections abut against each other when said arms are pivoted downward into an operating position, thereby preventing further downward pivotal motion of said arms, and a drive input for said raising and lowering mechanism, wherein said drive input includes a sprocket wheel having outwardly projecting sprockets that operates the raising and lowering mechanism when turned, and an elongated flexible element that engages the sprocket wheel and forms a dangling loop that can be grasped by a user and pulled to turn said sprocket wheel in one direction or another.