Riser for a vertically-opening door

Details Riser for a vertically-opening door Riser for a vertically-opening door

Filed on

1991-08-26

Date issued

1993-09-21

Examiner

Purol, David M.

Patent Class

Flexible or portable closure, partition, or panel

SubClass

Pleating type

SubSubClass

Lazy-tong links pivot about axes parallel to panel

Other Related Categories

160264, 160271, E06B 394

Type

Patent

Status

active

Patent number

052460533

Description

ABSTRACT:
A vertically-opening door installation which is exposed to cold on one side includes a vertically-opening flexible curtain (6) and two risers to guide the respective side edges of the curtain. Each riser includes a lining (12) made of a material which is a poor conductor of heat and which lines the inside of the channel section bar, and at least one longitudinally-extending cavity (14) providing a cushion of air between the outside surface of the channel section bar and the inside surface of its lining. The inside surface of lining (12) is smooth. At least one of the longitudinally-extending cavities (14) may include electrical heater resistance (15) or similar heating devices. The riser is provided to prevent frost and ice from forming around the side edges of the curtain of a goods-handling door which is exposed to the cold.

REFERENCES:
patent: 2501454 (1950-03-01), Schueren
patent: 2731804 (1956-01-01), Grubbs
patent: 2858408 (1958-10-01), Barroero
patent: 3292685 (1966-12-01), Clark
patent: 3697723 (1972-10-01), Winsler et al.
patent: 4194549 (1980-03-01), Lovgren
patent: 4397347 (1983-08-01), Brabant
patent: 4408650 (1983-10-01), Verch
patent: 4586552 (1986-05-01), Labelle
patent: 4647488 (1987-03-01), Schnebly et al.
patent: 4649981 (1987-03-01), Bibeau
patent: 4776379 (1988-10-01), Kraeutler

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