Apparatus for forming a marginally reinforced hole in a thermopl

Details Apparatus for forming a marginally reinforced hole in a thermopl Apparatus for forming a marginally reinforced hole in a thermopl

1980-03-25

1982-02-23

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With cutting, punching, piercing, severing, or tearing

156514, 156515, 156530, B26D 508, B32B 3118

Patent

active

043167632

ABSTRACT:
A marginally reinforced hole is provided in a sheet of weldable material by first welding a reinforcing ring to one sheet surface by means of a tubular electrode applied to its opposite surface while locating said ring by means of a pressure shoe presenting an internal cavity that is open at its bottom, and then admitting a pressurized gaseous fluid to said cavity to blow away the waste sheet material within the ring after the temperature of the sheet material within the welding area has reached the melting point.

REFERENCES:
patent: 3226283 (1965-12-01), Villalon
patent: 3457815 (1969-07-01), Cahill
patent: 3585095 (1971-06-01), Shearhod

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