Limited-torque plastic screw for attaching column-mounted elements of liquid-level gauges and feeding liquids thereto
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United States of America Patent
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N/A
Issued Date -
Jan 13, 2005
app pub date -
Jun 18, 2004
filing date -
Jul 9, 2003
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A limited-torque screw, designed for fastening column-mounted elements of liquid-level gauges and for feeding liquids to the elements, is provided over the length of its shaft with a blind axial bore and near its head with a transverse hole that intersects with the axial bore. The screw is molded from a synthetic plastic material and a slot provided in its head for the insertion of a screwdriver features a laterally curved bottom. The screw is produced in molds that generate a smooth mirror finish on the surfaces that define the blind axial bore and the transverse hole while allowing the thread of the screw to have a curved profile. The radius of the curved areas between the bottom and the sides of the screwdriver slot in the head of the screw is about one quarter the width of the slot.
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