Screw
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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N/A
Issued Date -
Sep 20, 2007
app pub date -
Mar 16, 2006
filing date -
Mar 16, 2006
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A screw includes a head and a shank extending down from the head. The shank is provided with a first clockwise-threaded portion from an intermediate portion to the bottom end, a counterclockwise-threaded portion the upper end of the first clockwise-threaded portion to the head, and a second clockwise-threaded portion formed in a lower end section of the first clockwise-threaded portion and having one-third length of the clockwise-threaded portion and threads between two threads of the first clockwise-threaded portion. Therefore, the lower end section of the shank has a smaller pitch able to permit the screw move into articles more easily and rapidly. Moreover, the counterbalancing function of the clockwise and the counterclockwise threads can keep the screw buried in the articles more stably without loosening easily.
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