Metal working – Method of mechanical manufacture – Structural member making
Reexamination Certificate
2006-10-17
2006-10-17
Nguyen, T. (Department: 3644)
Metal working
Method of mechanical manufacture
Structural member making
C029S430000, C029S432200, C029S525130, C052S656800, C052S656400, C049S050000, C049S501000
Reexamination Certificate
active
07121004
ABSTRACT:
A security door for a gate or building opening is formed of a metal frame that defines a pair of hollow stile frame members and upper and lower hollow transverse rail frame members. Each of the frame members has an inner face with an attachment flange projecting therefrom. Security receiving apertures are defined in the inner faces of the frame members. In the fabrication of the door a plurality of metal security bars are positioned relative to the hollow frame member so that the ends of the security bars project through the security bar receiving apertures and into the hollow frame members. The security bars pass over and reside in contact with the attachment flanges. The security bars are spot welded to the attachment flanges so as to permanently secure them to the door frame. Also, the frame itself is preferably formed from a single, elongated strip of metal that is roll formed and then bent at mitered corner cuts to create and delineate the stile and rail members. Corner fastening tabs are preferably formed on at least some of these members so as to reside in contact with the ends of other of the frame members located immediately adjacent thereto. The fastening tabs are secured by spot welding to the adjacent members which they contact.
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Columbia Manufacturing Corp.
Nguyen T.
Thomas Charles H.
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