Pre-Tension Anchorage for Spiral Balance
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United States of America Patent
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Issued Date -
Oct 2, 2008
app pub date -
Mar 30, 2007
filing date -
Mar 30, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method and device for applying a pre-tensioned force to a spiral window balance. The spiral balance includes a containment tube, a spiral rod and a torsion spring that traverses the length of the containment tube. The device includes a pre-tensioning insert that is contained within an anchorage fixed within the upper end of the containment tube. At least one boss formed at the base of a bore within the pre-tensioning insert defines a channel that receives the upper end of the spiral rod. To apply a pre-tensioned force to the spiral balance, the lower end of the spiral rod is pulled from the lower end of the containment tube, turned a number of revolutions and reinserted into the containment tube without being allowed to rotate. The upper end of the spiral rod is non-rotatably retained within the channel by the boss to prevent it from losing its pre-tensioned force.
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