초록

A screw having a root and threads formed on the root. The screw is configured to generate and/or maintain axial compression between threads formed in leading and trailing sections of the screw either by virtue of pitch differential in the threads or the way in which the screw is installed.

대표청구항 ▼

[ I claim:] [1.] A fastener comprising:a root portion, the root portion having a leading end, a trailing end and an elongate axis extending therebetween; anda single continuous thread formed on the root portion and extending between the leading end and the trailing end of the root portion, the threa

[ I claim:] [1.] A fastener comprising:a root portion, the root portion having a leading end, a trailing end and an elongate axis extending therebetween; anda single continuous thread formed on the root portion and extending between the leading end and the trailing end of the root portion, the thread having an outside diameter which, moving from the leading end toward the trailing end, increases over several revolutions, then decreases, then increases again, wherein the pitch of the thread measured between corresponding points on consecutive threads near the leading end is larger than the pitch of the threads near the trailing end.