Method of manufacture and assembly of extruded aluminum salt for

Details Method of manufacture and assembly of extruded aluminum salt for Method of manufacture and assembly of extruded aluminum salt for

1981-11-24

1984-01-31

Larson, Lowell A.

Metal deforming

By extruding through orifice

With metal-deforming other than by extrusion

52588, 72177, 160235, B21C 2314

Patent

active

044282184

ABSTRACT:
In a method for extruding an aluminum slat for a roller shutter with an undercut slot extending along one edge of the slat and formed by spaced apart front and rear members extending from the body of the slat, breakage of the part of the extrusion die which forms the slot is prevented by forming the slot in two steps. In the first step, the slat is extruded through a die which forms the front member in a position angled outwardly, so that the portion of the extruding die corresponding to the opening of the undercut slot can be made thick enough to withstand the extruding pressure without breaking. The front member is then bent back by a rolling operation to its desired position relative to the rear member.

REFERENCES:
patent: 1891740 (1932-12-01), Westerman
patent: 2569621 (1951-10-01), Toney
patent: 3110171 (1963-11-01), De Ridder
patent: 4187711 (1980-02-01), Lavochkin et al.
patent: 4228841 (1980-10-01), Dixon
Specification Sheet: Kommerling PVC Roller Shutters.

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