Abstract: A wheel cover retention system includes a plurality of bent wire retainers that attach a wheel cover to a wheel rim (such as a truck or trailer wheel rim). The retainers are formed from bent metal, and have a first end that snaps into an air-passing opening in the wheel rim, and a second end that hooks onto a wheel cover to hold the wheel cover on the wheel rim in a position centered on the wheel rim. The retention system is particularly useful for semi-trailer aluminum or steel wheels that include air-passing openings for reduced weight, but the present system can be used in other wheel rim arrangements.

Abstract: A telescoping fastener which is concealed upon the interconnection of two separate structures or elements is described. A male element is fastened as by a screw extension to one panel and a recess is provided in the other structural element or panel into which the male element is insertable to form the concealed self-locking joint. In the recess is positioned a cage-like female element which is centered on the axis of the recess as by a threaded member, such as a screw. The male element is pressed axially into the female portion and is frictionally gripped by selected parts of the cage impinging against the male portion at entry. This secures the two elements or portions in prevention of axial withdrawal and centers or stabilizes the male element against wobble or float. Where the cage requires strengthening, the strength is achieved by extending the head of the screw for the female element so that it buttresses the caging and may telescopically receive the male element where the male element is tubular.

Abstract: A concealed and joint forming fastener structure in which two screws with differing but telescopically interrelated heads are pressed together allowing the planes of the structural elements to which the screws are attached to come together flushly and with one screw head projecting into a recess in the other screw head and one of said screws located in a recess or socket in one of the structural elements.