Sheet with breakaway line
AssigneeTaylor Industries, Inc.
InventorPhilip W. Taylor
Life of this patent
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Abstract
A sheet of extruded material is provided with a breakaway line by positioning a pin in the extrusion die in a manner such that the pin extends into the path of the material being extruded to divide a portion of the material into two streams which rejoin each other past the pin and weld together to form an autogenous bond between the converging surfaces. In a preferred embodiment the breakaway line is present in the sides of a U-shaped channel of the type used as a duct for electrical wiring.
Claims3
A sheet of extruded plastic material having a breakaway line disposed substantially parallel to an edge of said sheet, said sheet being of substantially constant thickness and said breakaway line being a non-apparent line of reduced elasticity along an autogenous weakened bond of said plastic material, said breakaway line being formed during extrusion of said sheet by causing the flow of plastic material to separate and rejoin along said line.
Dependencies are inferred from the claim text.