Trailer fastening device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 5, 2002
Grant Date -
N/A
app pub date -
Dec 11, 2000
filing date -
Dec 11, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A trailer fastening device has a fastening shaft, a collar, a spring, and a solid ball. The collar has a center hole, a through hole, and an inner recess hole receiving the spring and the solid ball. The fastening shaft has a middle blocking disk, a lower threaded rod disposed on a bottom of the middle blocking disk, and an upper rod disposed on a top portion of the middle blocking disk. The upper rod has a helical groove, a blind hole formed on an end of the helical groove, and the end of the helical groove being a bevel. The upper rod is inserted in the center hole of the collar. The collar is rotated until the solid ball reaches the blind hole of the upper rod.
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