Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – With mounting or supporting means
Patent
1977-04-07
1978-04-04
Caun, Peter M.
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
With mounting or supporting means
49197, E05F 1100
Patent
active
040821331
ABSTRACT:
A counterbalance spring for garage doors of the sectional type which slide upward and over a horizontal track is located above and parallel to the track. The spring is a coiled spring which, after a period of time may fracture under tension and broken parts consequently may be thrown about at some peril. To contain the broken parts a rod extends through the coiled spring, is fastened to the building structure at both ends, and the pulley connected to one end of the spring is mounted on a carrier which slides on and is guided by the rod. The initial impact resulting from fracture of the spring while under tension is absorbed by a deformation of the rod serving as a cushion.
REFERENCES:
patent: 1826647 (1931-10-01), Blodgett
patent: 1983856 (1934-12-01), Johnson
patent: 2171194 (1939-08-01), Smith
patent: 3146825 (1964-09-01), Briggs, Jr. et al.
patent: 3272496 (1966-09-01), Halopoff
patent: 3958367 (1967-05-01), Fairman
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