Impactable bottom curtain for a rolling steel door

Flexible or portable closure – partition – or panel – Plural and/or with rigid closure – Roll type

Reexamination Certificate

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C160S133000, C160S405000

Reexamination Certificate



To avoid repeated damage to a lower section of a metal roll-up door, the lower section is replaced by a more impactable curtain assembly. The curtain assembly is so readily scalable, horizontally and vertically, that much of it can be manufactured and field assembled right at the installation site. The curtain assembly may comprise one or more strips of fabric that are cut from a roll of a certain width. The length of the fabric strips corresponds to the width of the doorway, and the number of strips is based on the vertical span of the door section that is being replaced. Windbars can be attached where adjacent strips connect to each other. A weighted, semi-rigid bottom bar reinforces the lower edge of the finished roll-up curtain. Under impact, the bottom bar has sufficient flexibility to allow the curtain to resiliently break away from within the door's vertical guide tracks.

patent: 2388297 (1945-11-01), Slaughter
patent: 2404257 (1946-07-01), Harry
patent: 2803297 (1957-08-01), Wenke
patent: 3292685 (1966-12-01), Morton
patent: 3331425 (1967-07-01), Groves et al.
patent: 3583465 (1971-06-01), Youngs et al.
patent: 4232725 (1980-11-01), Gidge
patent: 4478268 (1984-10-01), Palmer
patent: 4601320 (1986-07-01), Taylor
patent: 4800946 (1989-01-01), Rosenoy
patent: 5025847 (1991-06-01), Mueller
patent: 5056579 (1991-10-01), Kraeutler
patent: 5141043 (1992-08-01), Kraeutler
patent: 5141044 (1992-08-01), Hying et al.
patent: 5207256 (1993-05-01), Kraeutler
patent: 5307859 (1994-05-01), Kraeutler
patent: 5392836 (1995-02-01), West et al.
patent: 5450890 (1995-09-01), Pinkalla et al.
patent: 5474118 (1995-12-01), Hoffman
patent: 5477902 (1995-12-01), Kraeutler
patent: 5848631 (1998-12-01), DeGiovanni et al.
patent: 5964270 (1999-10-01), Kirkey et al.
patent: 6065525 (2000-05-01), Wells
patent: 6070640 (2000-06-01), Miyagawa et al.
patent: 6655442 (2003-12-01), Snyder
patent: 6722416 (2004-04-01), Varley et al.
Cornell Iron Works, “Introducing the Bull Fighter: Repeated Door Damage is a Lot of Bull,” 4 pages, dated Jun. 12, 1998.


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