Insulated folding door

Details Insulated folding door Insulated folding door

1986-06-11

1990-10-09

Purol, David M.

Flexible or portable closure, partition, or panel

Hanging or drape type

With fabric operating means

160199, 160118, 1603491, A47H 500

Patent

active

049614541

ABSTRACT:
A folding door for industrial use utilizes a curtain having a series of spaced-apart panel sections which are insulated, and one or more folding hinge sections spanning adjacent panel sections. The hinge sections are generally made of flexible sheet material thinner than the insulated panel sections. Such a curtain is suspended from a doorway, and is opened and closed by folding and unfolding the curtain around the hinge sections. The folding door of the invention is particularly advantageous for use in large industrial refrigerators and freezers.

REFERENCES:
patent: 1762576 (1930-06-01), Gray
patent: 3035275 (1962-05-01), Strebeigh
patent: 3321003 (1967-05-01), Boerner
patent: 3376599 (1968-04-01), Singer
patent: 3715969 (1973-02-01), Burgess
patent: 4083395 (1978-04-01), Romano
patent: 4141611 (1979-02-01), DeLeon
patent: 4142570 (1979-03-01), Heimberg
patent: 4142931 (1979-03-01), Viol et al.
patent: 4274467 (1981-06-01), Comeau
patent: 4355678 (1982-10-01), Romano

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