Threaded fastener
OwnerAnton Harleinventor
Life of this patent
Estimating the term…
Abstract
A fastener which can be utilized with advantage as a bone screw or another osteosynthetic force transmitting member, instrument or accessory has a thread with two flanks each having a first section adjacent the crest and a second section adjacent the root of the thread. The second sections jointly include or consist of at least four concave portions having different radii of curvature and gradually merging into each other. The first sections make angles of at least 40.degree. with a plane which is normal to the longitudinal axis of the thread. The first and second sections of each tooth flank are separated from each other by an imaginary cylinder having a diameter which matches the pitch diameter of the thread and a longitudinal axis which coincides with or is at least close to the longitudinal axis of the thread.
Claims29
A fastener for tensional and dynamic stressing, comprising a thread having a longitudinal axis, a pitch diameter, a root, a crest and two flanks each extending between said root and said crest and each having a first section disposed between said crest and an imaginary cylinder having said pitch diameter and an axis at least substantially coinciding with said longitudinal axis, each first section making an angle of less than approximately 40.degree. with a plane which is normal to said longitudinal axis and each of said flanks further having an arcuate second section disposed between said root and said imaginary cylinder, said second sections jointly including at least four portions having different radii of curvature.
Dependencies are inferred from the claim text.