winding and anti-drop assembly for door counterbalance system

Details winding and anti-drop assembly for door counterbalance system winding and anti-drop assembly for door counterbalance system

2007-08-14

2007-08-14

Mah, Chuck Y. (Department: 3677)

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Sash balances

Spring

C160S191000

Reexamination Certificate

active

11023203

ABSTRACT:
A counterbalance system (25) for a door (D) movable between a closed position and an open position having an axle (20), a cable drum (15) attached to the axle, a winding shaft (35) interconnected with the axle by a counterbalance spring (26), and a pawl (70) selectively movable between a first position for adjusting tension in the counterbalance spring and a second position for preventing rotation of the cable drum upon failure of the counterbalance spring, thereby limiting movement of the door toward the closed position.

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