Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Sash balances – Spring
Patent
1997-11-21
2000-03-28
Mah, Chuck Y.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Sash balances
Spring
16196, 49445, 254393, B66D 308
Patent
active
060414766
ABSTRACT:
Pulleys of a block and tackle window balance include hub steps that interact with other components to reduce the introduction of dirt and dust particles into areas vulnerable to wear. The hub steps of some of the pulleys are recesses formed about the axial bores of the pulleys that mate with protrusions on an axle and a washer. The hub steps of other pulleys are protrusions that abut a support plate and heads of rivets that act as axles. The hub steps allow inverse mounting of the window balance so that the balance can be mounted in a shoe channel for movement with a sash of the window, attached to the sash shoe, and the cord can be attached to the jamb or frame, thus increasing sash travel.
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Caldwell Manufacturing Company
Gurley Donald M.
Mah Chuck Y.
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