Frictional drop resistance for sash counterbalanced by curl...

Details Frictional drop resistance for sash counterbalanced by curl... Frictional drop resistance for sash counterbalanced by curl...

2008-04-21

2011-12-13

Redman, Jerry (Department: 3634)

Movable or removable closures

With means mounting closure for reciprocation

With counterbalance

C049S447000, C016S193000, C016S197000, C016S198000, C016S199000, C016S401000

Reexamination Certificate

active

08074402

ABSTRACT:
Window sash counterbalances using curl springs and holders can increase resistance to sash drop without causing sash hop by using a high coefficient of friction bearing surfaces against which curled up coils of curl springs slide when uncurling or re-curling. The higher friction bearing material produces more frictional resistance to spring uncurling than to spring re-curling and thus resists drop without causing hop. This allows a wider range of sash weights to be counterbalanced by a fewer number of counterbalance forces, saves manufacturing cost.

REFERENCES:
patent: 2644193 (1953-07-01), Anderberg
patent: 3150420 (1964-09-01), Brenner
patent: 5353548 (1994-10-01), Westfall
patent: 5365638 (1994-11-01), Braid et al.
patent: 5463793 (1995-11-01), Westfall
patent: 6584644 (2003-07-01), Braid et al.
patent: 6598264 (2003-07-01), Newman
patent: 6679000 (2004-01-01), Uken et al.
patent: 6820368 (2004-11-01), Uken et al.
patent: 6983513 (2006-01-01), Pettit
patent: 7076835 (2006-07-01), Harold et al.
patent: 7587787 (2009-09-01), Pettit

Affiliated with

Also associated with

Rating

Frictional drop resistance for sash counterbalanced by curl... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frictional drop resistance for sash counterbalanced by curl..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frictional drop resistance for sash counterbalanced by curl... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4255736