Abstract: A hoist apparatus for lifting objects up the side of a building or the like and swinging the objects onto the roof or other surface. The hoist can be erected and operated by one person and can be folded into a compact, easily moved, package. A pair of spaced triangular leg assemblies are typically clamped to the edged of the roof parapet in a spaced relationship. Each triangular assembly when installed for this use is made up of a first leg formed by one beam that is a vertical portion of the clamp and a flexible extension, such as a chain, extending from the lower end of the beam, a second leg secured at one end to the free end of the extension and a third leg pivotally connected between the second ends of the first and second legs, forming a triangle with an acute angle between the second and third legs. A cross beam extends between the second and third leg connections and is adapted to carry a hoist, typically a block and tackle arrangement.

Abstract: Disclosed is a method and apparatus for forming a cold weld joint between parts comprising a sleeve (or coupling) to receive the ends of conductors (or pipes). The sleeve is provided with weld pads which when the sleeve cools will engage one of the conductors and be cold welded thereto by the forces of shrink fit. Serrations are provided for axial strength of the joint and to limit the plastic flow of the material of the pads. A second conductor is loosely telescoped in the sleeve by bellows for compensating for any misalignment when the parts are initially brought together. Later the bellows is provided with a backing material to rigidly connect the second conductor to the sleeve.