Multivent system for dryer exhaust

Details Multivent system for dryer exhaust Multivent system for dryer exhaust

1986-10-29

1988-06-28

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

29418, 72335, 220226, 413 15, 174 65R, F26B 2512

Patent

active

047530189

ABSTRACT:
A method of making a knockout plug in a sheet of metal is provided. The method comprises the steps of: shearing the sheet metal along a majority of a perimeter of a geometric shape so that a plug is produced retained to the sheet metal by at least one retaining strip; cold working at least one sheared area at a pressure sufficient to cause the sheared sheet metal in the area to coalesce; and shearing the retaining strip so that the sheet metal has been sheared along the entire perimeter of the geometric shape. An appliance having a metal casing and a knockout plug stamped in the casing for providing a vent in the cabinet is also provided. The knockout plug is fully sheared along its entire perimeter and has an area along its perimeter that has been cold worked to produce coalesce between the sheared metal.

REFERENCES:
patent: 3152715 (1964-10-01), Daniels

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