Plastic article or earthenware shaping or treating: apparatus – Preform assembly means and means for bonding of plural... – Opposed coacting press members
Reexamination Certificate
2004-12-16
2008-09-30
Gupta, Yogendra (Department: 1791)
Plastic article or earthenware shaping or treating: apparatus
Preform assembly means and means for bonding of plural...
Opposed coacting press members
C425S392000, C425S398000, C425S403000
Reexamination Certificate
active
07429172
ABSTRACT:
An object of the invention is a method of forming by hot stamping pieces of complex sheeting, composed of a one-piece element comprising several parts of relatively low thickness arranged in different intersecting planes, proceeding from a blank composed of at least one layer of fibers, which have been pre-impregnated with a thermoplastic resin, in which said preheated blank is formed in an assembly composed of a punch and a die. The method includes the steps of a first phase, the part of said blank that is to comprise the bottom or analog of the piece to be obtained is pressed against the bottom of the die, then the second phase, the part or parts of the blank comprising the flanged edge or flanged edges of said piece are pressed against the sides of the die, the work piece that has been obtained in this way then being removed from the jig.
REFERENCES:
patent: 3901640 (1975-08-01), Tigner et al.
patent: 4397629 (1983-08-01), Akutsu et al.
patent: 742 682 (1943-12-01), None
patent: 4234002 (1994-04-01), None
Gupta Yogendra
Nguyen Thu Khanh T
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