Patent ID: 9234539
Filing Date: 2016-01-12
CPC Classification: F16B

Claim Text:
1. A fastener, comprising: a head, a shank, and a tip; said shank comprising an unthreaded section proximate said head, a threaded section proximate said tip, and a reverse threaded section between said unthreaded section and said threaded section wherein said reverse threaded section is directly adjacent to said threaded section; wherein said threaded section and said reverse threaded section include threads having substantially similar pitches; wherein said reverse threaded section includes a greater number of threads per millimeter than said threaded section; wherein said shank and said tip include a cut extending inwardly substantially to an axis of said fastener, the cut creating a face with exposed thread profiles; wherein said tip is generally conical and forms a conical angle between about 20 degrees and about 40 degrees; wherein a runout height for the thread of the threaded section proximate said tip is between about 0.1 mm and about 0.5 mm and a transition from tapered to generally constant thread height is between about 4 mm and about 6 mm; and wherein said reverse threaded section has a length between about 4 mm and about 10 mm and said unthreaded section has length at least about as long as said reverse threaded section.