Abstract: A circular pipe coupling for coupling aligned pipe ends is formed of arcuate segments arranged end to end. Each segment has outwardly extending lugs formed on its opposite ends, with the lugs on the adjacent segment ends being interconnected. One of each pair of interconnected lugs is formed with an integral hook, with a corresponding opening for receiving the hook formed on the opposite lug and providing an axle upon which the hook is engaged to form a hinge connection, except that one of the pairs of lugs is connected together by a manually releasable mechanical fastener, such as a bolt. One of the segments may be manually positioned upon the adjacent pipe ends to be coupled, with one or more segments freely dangling downwardly therefrom under the force of gravity, which sections may be manually pivotal upwardly for encircling the pipes and for applying the releasable mechanical fastener.

Abstract: A pipe coupling is formed of a pair of similar semicircular segments of a preselected diameter which are fastened together by separate, standard-size, length-adjustable fasteners to form a predetermined diameter circular casing for surrounding and connecting adjacent, axially aligned pipe ends. Each segment has radially arranged, opposite end faces which abut the corresponding end faces of the other segment to form a pair of diametrically aligned junctures. Depressed sockets are formed in the exterior, peripheral surface of each segment near the junctures. Each fastener is formed of an internally threaded tube having an end portion telescopically fitted within a tubular barrel, with a screw having a head engaged against the free end of the barrel and a shank extending through the barrel and threadedly engaged within the tube. The laterally extending teeth which are formed on the tube and barrel fit into the sockets on opposite sides of each juncture.

Abstract: A standard pipe coupling is formed of two, semi-circular segments that are bolted together to form a circular casing which surrounds the adjacent, axially aligned, end portions of two pipes to be connected. The casing is U-shaped in cross-section to form an exterior base and radially inwardly directed legs which are of substantially equal length. The radially inner edge portions of the legs form continuous, annular, narrow tenons which normally fit into annular grooves formed in the exterior surfaces of the pipes for interconnecting the casing and substantially equal diameter pipes. A diameter reducing insert comprising a flat, thin, segmented ring whose outer peripheral edge is formed with a continuous groove is arranged coplanar with one of the legs, and with its groove receiving the tenon of that leg.