Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Sash balances – Spring
Patent
1997-03-05
1998-04-07
Mah, Chuck
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Sash balances
Spring
160191, E05F 100
Patent
active
057350205
ABSTRACT:
The disclosed invention is directed to a torsion spring counterbalance assembly for closures, preferably for aircraft doors, although it is applicable to closures in other environments. The counterbalance system is designed to reduce the total assembly weight by 50% relative to a steel spring assembly. A helical torsion spring is mounted on one or both sides of a support housing, the springs preferably being made of a fiber-reinforced epoxy. Duplicate springs (same part number, wound and loaded in the same direction) may be used on the left and/or the right sides of the assembly to reduce tooling cost and part inventory cost. Operating with duplicate springs is accomplished by placing fixed spring mounting plates for both springs on the left and the rotating end plates for both springs on the right. Both fixed end plates mount to the housing assembly while both rotating end plates mount to the torque output shaft. Similarly, end plates, torque tubes and shock support tubes, bearings, clips, e.g., are common between the right and left side of the assembly.
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Gurley Donald M.
Hercules Incorporated
Mah Chuck
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