Patent ID: 8235659

Claim:
A lanced and slit seam housing comprising: a housing formed from two side panels having a thickness and each having a periphery and a wrapper, each of said side panels and said wrapper formed from a sheet material; and said wrapper having two edge flanges positioned at or near said periphery and said edge flanges having a “U” form cross section with a leg separation of the “U” approximately equal to said thickness of said side panel sheet material and sufficient to at least partially insert said panel; and said periphery of each of said side panels at least partially inserted into said “U” form edge flanges between said leg separation of each of said edge flanges; and said periphery with said housing and said inserted panel having a substantially continuously rolled seam forming an intimate three layer sandwich between said edge flange and said panel at said periphery; and said seam formed via an action of a mated pair of rollers engaged with said periphery sandwich of said edge flange and said housing when a rotation, a linear movement, and a vertical movement is imparted to said housing and said inserted panel; and one or more pressed indentations, lances, or slits within said rolled seam formed via one or more protrusions which mate with one or more recesses within said mated pair of rollers and mate with said sandwich as said seam is rolled; and said wrapper and said panels interlocked together and forming said intimate sandwich without a gap or an air flow leakage in said wrapper or said panels thereby preventing undesirable rotation of said panels relative to said wrapper whereby one or more secondary assembly operations are eliminated.