Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Making hole or aperture in article
Patent
1990-01-18
1991-05-28
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Making hole or aperture in article
264156, 264163, 425290, B29C 5132
Patent
active
050193139
ABSTRACT:
A male and female mold parts combination for forming a latch opening in a container molded from a softened sheet of plastic having a female mold key member arranged on the female mold part; a male mold key member arranged on the male mold part; a cutting edge adjacent to a planar face of one key and a vertical surface having a bevelled edge surface on the other key. The keys being normally registered so that on closure of the mold parts, initial contact will involve the cutting edge, the bevelled edge surface and the plastic therebetween. One of the keys is fixed in one of the mold parts and the other of the keys being located in the other of the mold parts and free to move independently of its mold part so that on closure of the mold parts the cutting edge will ride off the bevelled edge surface and slide across the vertical surface piercing and enlarging a latch opening in the plastic. The free to move key is carried so that on separation of the mold parts it is returnable to its original position and attitude occupied just prior to said initial contact.
REFERENCES:
patent: 3279293 (1966-10-01), Giordano
patent: 3742801 (1973-07-01), Cailloux
patent: 3845187 (1974-10-01), Dahlberg
patent: 3862817 (1975-01-01), Dahlberg
patent: 4108941 (1978-08-01), Kermoian
patent: 4446088 (1984-05-01), Daines
patent: 4612153 (1986-09-01), Mangla
McKillop A. J.
Mobil Oil Corporation
O'Sullivan, Sr. J. P.
Speciale C. J.
Thurlow Jeffery
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