Apparatus for opening and closing roll-up door

Details Apparatus for opening and closing roll-up door Apparatus for opening and closing roll-up door

1988-12-06

1990-12-11

Johnson, Blair M.

Flexible or portable closure, partition, or panel

Roll type

With rotating means

160321, E06B 920

Patent

active

049763024

ABSTRACT:
A rolling door mechanism employing an idler drive member freely supported about an idler roll of a roll door assembly. An adjusting element, for example, a coiled spring which surrounds the idler roll, accommodates differences in speed of the idler drive member and the idler roll. The adjusting element is connected at one end for rotation with the idler drive member and at the other end for rotation with the idler roll. In one preferred embodiment the coiled spring is tensioned during rotation of the idler drive member in one direction by drive means and this tension is released during rotation of the idler drive member in the opposite direction.

REFERENCES:
patent: 1936300 (1933-11-01), Guss
patent: 2738179 (1956-03-01), Joy
patent: 2819628 (1958-01-01), Wardlaw
patent: 2957521 (1960-10-01), Greegor
patent: 3522834 (1970-08-01), Corcoran
patent: 3637004 (1972-01-01), Wardlaw et al.
patent: 3680622 (1972-08-01), Lester, Jr.
patent: 3853167 (1974-12-01), Wardlaw
patent: 3989084 (1976-11-01), Inamura et al.
patent: 4478268 (1984-10-01), Palmer
patent: 4690195 (1987-09-01), Taylor

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