Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1988-12-02
1992-12-08
Rosenbaum, Mark
Metal working
Method of mechanical manufacture
Assembling or joining
29453, 29460, 264515, 264545, 312406, 3124062, B23P 1102
Patent
active
051686210
ABSTRACT:
An insulated panel for a domestic or household appliance is formed by a process in which two sheets of plastic material are extruded from a co-extrusion die and moved directly into a die thermoforming fixture. When the open die members are closed, the edges of the two sheets are sealed together to form a hollow panel and the walls of the panel are forced outwardly to conform to the shape of the die members. After the hollow panel is trimmed it is moved to a foam machine preferably while still contained in the thermoforming fixture so that foam insulation is inserted into the hollow panel while the walls of the panel are supported by the die members so that these walls are not deformed while the foam insulation is added. The process provides integrally formed components on the walls of the panel in a single manufacturing operation and also provides in the same manufacturing operation integrally formed interlocking members in the edges of the panel which permits the assembly of panels together by unskilled personnel and without requiring separate fastening elements.
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patent: 3736201 (1973-05-01), Teraoka
patent: 4125301 (1978-11-01), Phan
patent: 4171151 (1979-10-01), Luck
patent: 4519964 (1985-05-01), Rosen
patent: 4765934 (1988-08-01), Nazar et al.
patent: 4782972 (1988-11-01), Wenkman et al.
Burin Ralph R.
Iannelli Ronald F.
Kruck Richard W.
Laundroche Kevin S.
Hughes S. Thomas
Rosenbaum Mark
Whirlpool Corporation
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