Muntin bars

Details Muntin bars Muntin bars

2005-04-26

2005-04-26

Hong, John C. (Department: 3726)

Static structures (e.g., buildings)

Window or window sash, sill, mullion, or glazing

Decorative grill attached to sash

C052S204500

Reexamination Certificate

active

06883278

ABSTRACT:
Method and apparatus for making a contoured muntin bar. A supply of sheet material having a finished surface on at least one side in the form of a coiled ribbon is unwound and fed along a strip path of travel to a punch station. At the punch station a ribbon punching mechanism punches the ribbon at a precisely predetermined locations along the ribbon to form one of a plurality notch patterns that define a portion of a contoured muntin bar. Downstream along the travel path from the punch station the ribbon is fed through a forming station having a succession of forming rolls that define a succession of forming roll nips to bend the ribbon and form a generally closed cross-sectional tube. The rolls form a number of bending stages to produce a muntin bar tube having a contoured shape with raised sides to provide an attractive appearance to a muntin grid.

REFERENCES:
patent: 2959849 (1960-11-01), Rubin
patent: 4975334 (1990-12-01), Bullivant-Clark
patent: 5058269 (1991-10-01), May
patent: 5088307 (1992-02-01), Cole
patent: 5179770 (1993-01-01), Block et al.
patent: 5295292 (1994-03-01), Leopold
patent: 5361476 (1994-11-01), Leopold
patent: 6035597 (2000-03-01), Donaldson

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