Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1989-10-02
1991-05-28
Goldberg, Howard N.
Metal working
Method of mechanical manufacture
Assembling or joining
29897312, 49425, 72307, 160371, B21D 3500
Patent
active
050182633
ABSTRACT:
A one-piece sealed, hollow, steel sliding screen door frame and method of fabrication thereof is described. A flat steel strip is diecut to produce 45.degree. miter cuts, each having an opposing flap. The cut strip is rolled to produce a frame stock having an essentially rectangular profile. Longitudinal edges of the strip are folded together, crimped and bonded during the rolling and form a screen channel in the frame stock. The frame stock is bent at right angles at the miter cuts such that the flaps tuck under the miter cuts, forming a rectangular door frame. Epoxy is used to bond the flaps to the inner surfaces adjacent the miter cuts. A screen door assembled using the door frame includes self-centering wheel assemblies.
REFERENCES:
patent: 2006925 (1949-06-01), Klemp
patent: 3879894 (1975-04-01), Anderson
patent: 4112622 (1978-09-01), Stewart
patent: 4462237 (1984-07-01), Kauferle
patent: 4503640 (1985-03-01), Stern
patent: 4562677 (1986-01-01), Hrabak
Cuda D.
Goldberg Howard N.
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