Method for perforating roofing sheet material

Details Method for perforating roofing sheet material Method for perforating roofing sheet material

1976-04-27

1977-08-16

McGehee, Travis S.

Cutting

Processes

Puncturing

156253, B26F 124

Patent

active

040418154

ABSTRACT:
The apparatus of the present invention comprises at least one hole-punching device operated by a pneumatic cylinder for driving a punch rod through the peripheral surface and radially to the center of a roll of roofing sheet material. The method of the invention provides for the steps of preparing the sheet roofing material, winding the sheet into a roll, and punching a plurality of perforation holes in the roll from the surface to the center thereof.

REFERENCES:
patent: 1398320 (1921-11-01), Dunsworth
patent: 1456344 (1923-05-01), Van Ness
patent: 2339773 (1944-01-01), Egan
patent: 2550937 (1951-05-01), Pye

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