E - Fixed Constructions – 05 – F
Patent
E - Fixed Constructions
05
F
E05F 7/06 (2006.01)
Patent
CA 2627738
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.
Borden Ladner Gervais Llp
Caldwell Manufacturing Company
LandOfFree
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