Apparatus for forming an enlarged flanged hole in a curved surfa

Details Apparatus for forming an enlarged flanged hole in a curved surfa Apparatus for forming an enlarged flanged hole in a curved surfa

1981-01-21

1983-06-28

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With cutting of work or product

72325, 72340, 72367, 408189, 408713, B21D 1900, B23B 4106, B23B 5108

Patent

active

043898661

ABSTRACT:
An apparatus useful for forming in a curved surface, an enlarged hole surrounded by an upturned flange whose unattached edge lies substantially in a common plane, uses a drill rod, a set of bits, and a mechanism for forming an upturned flange. A first bit attached to the lower end of the rod forms an initial hole. A second bit, spaced axially along the rod, forms a widened oval hole with tapered sides upon continued axial and rotary movement of the rod relative to the workpiece. A flange forming mechanism is then extended beneath the edge region of the hole and pulled through the hole while rotating, to form the upturned flange. A third bit mounted peripherally with respect to the second bit is used to smooth and level the flange edge and to provide it with a desired shape.

REFERENCES:
patent: 1983407 (1934-12-01), Scholtes
patent: 2437822 (1948-03-01), Jones
patent: 2453848 (1948-11-01), Livingston et al.
patent: 2511836 (1950-06-01), Cullen
patent: 2663203 (1953-12-01), Fried et al.
patent: 3122830 (1964-03-01), Dawson et al.
patent: 3340840 (1967-09-01), Lechner
patent: 3592038 (1971-07-01), Larikka
patent: 3714808 (1973-02-01), Larikka
patent: 4177659 (1979-12-01), van Geffen

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