Movable or removable closures – With means mounting closure for reciprocation – With counterbalance
Patent
1993-04-01
1994-10-11
Kannan, Phlip C.
Movable or removable closures
With means mounting closure for reciprocation
With counterbalance
49176, 49181, 16197, E05D 1300, E05D 1522
Patent
active
053535480
ABSTRACT:
A window balance system for a tilt sash uses a pair of constant force curl springs having curled convolutions carried by sash shoes and free end regions mounted in sash shoe channels above the region of travel of the shoes. The recurl tendency of the springs imparts a lift to the curled spring convolutions, and the shoes transmit the lift to the sash. The springs recurl into the convolutions as the shoes rise and uncurl from the shoes into the shoe channels when the shoes move downward, and neither movement requires the springs to slide frictionally within the shoe channels. Each shoe is preferably formed of two identical halves that are assembled to trap the curl spring along with a cam that locks the shoe when the sash tilts.
REFERENCES:
patent: 2609193 (1952-09-01), Foster
patent: 2635282 (1953-04-01), Trammell, Sr. et al.
patent: 2684499 (1954-07-01), Lewis
patent: 2732594 (1956-01-01), Adams et al.
patent: 2739344 (1956-03-01), Dickinson
patent: 2817872 (1957-12-01), Foster
patent: 2873472 (1959-02-01), Foster
patent: 3150420 (1964-09-01), Brenner
patent: 3445964 (1969-05-01), Foster
patent: 3452480 (1969-07-01), Foster
patent: 3475865 (1969-11-01), Arnes
patent: 3820193 (1974-06-01), Foster
patent: 3869754 (1975-03-01), Foster
patent: 3992751 (1976-11-01), Foster et al.
patent: 4227345 (1980-10-01), Durham, Jr.
patent: 4935987 (1990-06-01), Sterner, Jr.
patent: 4953258 (1990-09-01), Mennuto
patent: 4961247 (1990-10-01), Leitzel et al.
patent: 5119591 (1992-06-01), Sterner, Jr. et al.
patent: 5157808 (1992-10-01), Sterner, Jr.
patent: 5210976 (1993-05-01), Cripps
patent: 5232208 (1993-08-01), Braid et al.
Caldwell Manufacturing Company
Kannan Phlip C.
LandOfFree
Curl spring shoe based window balance system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Curl spring shoe based window balance system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Curl spring shoe based window balance system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1650412