Fastener
OwnerDin-Hwa Wuinventor
Life of this patent
Estimating the term…
Abstract
A fastener includes a head, a shank, a drilling portion connected to the shank, a threaded portion spirally disposed on the shank, and an auxiliary portion disposed on the shank and between thread convolutions of the threaded portion. The auxiliary portion has a plurality of cone units and channels. Each channel is formed between any two adjacent cone units. The cone units assist the threaded portion in severing fibers of a workpiece, thereby achieving a multi-stage cutting effect. The channels help attain a quick removal of severed fibers and accommodate an adequate number of remaining severed fibers. Further, the cone units help attain a multi-point engagement effect to achieve a tight engagement between the fastener and the workpiece, thereby improving a positioning effect.
Claims7
A fastener comprising:
- a shank;
- a head disposed at an end of said shank;
- a drilling portion disposed at another end of said shank and tapered to form a drilling point;
- a threaded portion spirally disposed on a peripheral surface of said shank and formed with a plurality of thread convolutions;
- and
- an auxiliary portion disposed on said peripheral surface of said shank and located between said thread convolutions of said threaded portion, wherein said auxiliary portion includes a plurality of cone units formed between said plurality of thread convolutions, said auxiliary portion further including a plurality of channels, each of said plurality of channels being formed between any two adjacent cone units, each of said plurality of cone units having a base portion joined to said peripheral surface of said shank and a conical portion extended outwards from said base portion and tapered to form a tip.
Dependencies are inferred from the claim text.