Abstract: Rotatable bellows-like covers made up of a number of sections, each formed from annular elements, incorporate a rotatable section permitting the cover to expand and contract lengthwise and simultaneously permit rotation of a portion thereof with respect to another portion. The rotatable bellows-like covers are particularly suitable for protectively enclosing movable mechanical arms on welding robots and the like and specifically the hinged portions thereof which are movable in angular relation to one another and rotatable with respect to one another.

Abstract: A Flexible Joint Protector for use with steam pipes of the same or different diameters comprise multiple bellows where the bellows are of different diameters and arranged one within another and have sleeves on their outer sides. Clamps are used to secure the sleeves to the pipes.