Patent ID: 7438512
Filing Date: 2008-10-21
Classification: F16B

Abstract:
1. A male fastener, comprising: a) a shaft that includes an axis, a first end, and a second end; b) the shaft is provided with a trilobular shape with a first threaded surface and a second threaded surface; c) the first threaded surface includes a first locking thread, a first guide thread, and a first conventional thread; d) the second threaded surface includes a second locking thread, a second guide thread, and a second conventional thread; e) the first guide thread includes a first guide means for guiding the threads on the shaft into mating alignment with a first female thread of a first female threaded member; f) the second guide thread includes a second guide means for guiding the threads on the shaft into mating alignment with a second female thread of a second female threaded member; g) the first guide thread is generally located at the first end of the shaft and leads directly into the first conventional thread, the second guide thread is generally located at the second end of the shaft and leads directly into the second conventional thread; h) the first conventional thread is provided with a first generally Vee-shaped root including a first root diameter configured to mate with the first female thread of the first female threaded member so as to be freely rotatable thereon; i) the second conventional thread is provided with a second generally Vee-shaped root including a second root diameter configured to mate with the second female thread of the second female threaded member so as to be freely rotatable thereon; j) the first conventional thread and the second conventional thread include a generally constant shape that extends for a plurality of turns, the first conventional thread leads directly into the first locking thread, the second conventional thread leads directly into the second locking thread; and k) the first locking thread includes a first root surface provided with a third root diameter that is greater than the first root diameter, the second locking thread includes a second root surface provided with a fourth root diameter that is greater than the second root diameter, wherein the first locking thread is configured to re-form the first female thread to resist relative rotation between the shaft and the first female threaded member, and the second locking thread is configured to re-form the second female thread to resist relative rotation between the shaft and the second female threaded member.