Safety brake for block and tackle window balance
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United States of America Patent
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Apr 18, 2006
Grant Date -
Nov 20, 2003
app pub date -
Mar 25, 2003
filing date -
Mar 25, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to inertial braking system for spring-loaded devices, such as block and tackle window balances incorporated in single and double hung window assemblies. In one embodiment, a block and tackle window balance includes a translatable block assembly disposed in a track including a pawl pivotally attached to the translatable block assembly. The pawl, in response to a rapid acceleration of the translatable block assembly, rotates about a pivot and frictionally engages the track, thereby wedging the translatable block assembly in the track. In another embodiment, the translatable block assembly includes a cam attached to the pawl and a brake shoe disposed between the cam and a cord seated within a pulley. Rotation of the pawl causes the cam to translate the brake shoe, thereby compressing the cord against the pulley.
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