Abstract: The invention is an interlocking structure. It can be shipped in a low volume disassembled state. It is easily interlocked together, without tools or special skills, by the eventual user. The interlocked structure has uncommon rigidity and strength. Containers like dresser drawers, laundry baskets or waste paper baskets, shelters like dog houses and human shelters, or furniture like a portable fireplace can be interlocked together using a plurality of interconnecting rods and hooks. The abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).

Abstract: A pedal crank bearing assembly includes a housing, a tube, two races, two bearings and an axle. The axle is rotatably engaged within the tube by two bearings and at least one bearing is received in an inner side of one of the races which is threadedly engaged to an inner periphery of the housing and the tube is threadedly engaged to an inner periphery of the race. The race has a serrated face defined at an end thereof for engagement to a stop fixed on the tube for preventing the race from rotating.