Hose clamp

A clamp structure for objects to be fastened by radially directed clamping forces, comprising clamping band means having open ends and operable to exert radially directed forces on an underlying object to be fastened, means connecting the open ends with each other, and ear means in the clamp structure for tightening the clamping band means about the object to be fastened by plastic deformation of said ear means, characterized in that at least the free ends of said clamping band means are provided with arched surface means, as viewed in transverse cross section through the band means, to provide outwardly extending, groove-like reinforcing embossments, and in that at least one end of said band means is of tapered configuration, as viewed in the circumferential direction thereof, with the tapering side surfaces converging toward each other in the direction toward the respective band end so that the arched surface means of said one band end are able to engage in overlying arched surface means near the other band end to assure thereby a continuously smooth, stepless internal configuration of the band means during tightening thereof by contraction of the ear means as the diametric dimension is reduced.