Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – With mounting or supporting means
Patent
1977-08-17
1978-12-05
Kannan, Philip C.
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
With mounting or supporting means
16197, 160235, E05F 1154
Patent
active
041281209
ABSTRACT:
A tambour or roll-top door and housing assembly comprises a tambour door formed of a plurality of longitudinal segments engaged along their adjacent sides by parallel hinge elements, and a housing having a pair of spaced tracks defining a curved path, the door being positioned with its side edges engaging the two tracks respectively and the segments being relatively pivotable when the door slides around the curve between open and closed positions. The assembly further includes a gear having a circular pitch distance between teeth corresponding to the pitch between the door's hinged segments, the gear being rotatable on a shaft with at least one tooth always engaging one door segment, and a Negator.sub.tm spring having one end secured to the bottom of the door and the remaining spiral portion freely rotatable on the gear shaft. Movement of the door toward either closed or open position causes the Negator spring to be further wound or unwound, this spring having the characteristic of constant torque regardless of the degree of winding, so that the door is effectively counter-balanced in all positions.
REFERENCES:
patent: 1220910 (1917-03-01), Toll
patent: 2090099 (1937-08-01), Bittorf et al.
patent: 2817872 (1957-12-01), Foster
patent: 2850088 (1958-09-01), Purdy
patent: 3150420 (1964-09-01), Brenner
patent: 3869754 (1975-03-01), Foster
InterRoyal Corporation
Kannan Philip C.
March Arthur A.
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