Method of making bellows

Details Method of making bellows Method of making bellows

1980-01-14

1982-04-20

Massie, Jerome W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

29454, 92 34, 156226, 1562751, 264163, 354187, B23P 1904, F16J 304, G03B 1704

Patent

active

043257690

ABSTRACT:
A method for making an axially extendable and contractable bellows is provided for use in monolayer photographic lithographic cameras and enlargers. The method includes the initial step of passing a single web of synthetic resin sheet material past at least one die having die edges arranged in a predetermined pattern for producing a separable bellows blank having fold lines formed therein for forming of multiplicity of pleats. Then the bellows blank is die formed and following its separation from the web it is folded onto itself to produce a seam which is then bonded. Finally, the hollow body thus formed is compressed along its longitudinal axis and along the fold lines so as to produce a pleated bellows configuration.

REFERENCES:
patent: 2589022 (1952-03-01), Page et al.
patent: 2965961 (1960-12-01), Schindler et al.
patent: 3265551 (1966-08-01), Ananian et al.
patent: 3336950 (1967-08-01), Fochler
patent: 3461531 (1969-08-01), Degain
patent: 4008651 (1971-02-01), Pain
patent: 4186779 (1980-02-01), Wagner

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