Molding apparatus for producing centrally-apertured discs

Details Molding apparatus for producing centrally-apertured discs Molding apparatus for producing centrally-apertured discs

1986-12-30

1988-09-20

Hoag, Willard

Plastic article or earthenware shaping or treating: apparatus

With control means responsive to independently operated timer

425290, 425577, 425810, B29C 3930, B29C 3944, B29C 4538

Patent

active

047721960

ABSTRACT:
The present invention relates to an injection molding apparatus for producing video discs, compact discs, etc. Most particularly, the present invention provides an injection molding apparatus for producing the discs mentioned above in which when a punch severs an aperture in the disc while in the mold halves and not solidified, a sprue bushing is arranged to retreat while a resisting force is applied to the sprue bushing against the urging force of the punch.

REFERENCES:
patent: Re31235 (1983-05-01), McNeely et al.
patent: 941291 (1909-11-01), Wickes
patent: 1275100 (1968-08-01), Steventon
patent: 1399817 (1921-12-01), Steventon
patent: 1594662 (1926-08-01), Cawley
patent: 1737619 (1929-12-01), Smith
patent: 1915357 (1933-06-01), Fernberg
patent: 2030726 (1936-02-01), Strock et al.
patent: 2092880 (1937-09-01), Hunter et al.
patent: 2584892 (1952-02-01), Lord
patent: 2587070 (1952-02-01), Spillman
patent: 2613395 (1952-10-01), Massler
patent: 2642621 (1953-06-01), Amo
patent: 2976571 (1961-03-01), Moslo
patent: 2992455 (1961-07-01), Salzman
patent: 3154816 (1964-11-01), Harrison et al.
patent: 3397425 (1968-08-01), Phillipson et al.
patent: 3442990 (1969-05-01), Phillipson et al.
patent: 3897929 (1975-08-01), Hartmann
patent: 3932097 (1976-01-01), Press
patent: 3937779 (1976-02-01), Simmons
patent: 3969057 (1976-07-01), Pierre
patent: 3986805 (1976-10-01), Haines
patent: 3989436 (1976-11-01), McNeely et al.
patent: 4085178 (1978-04-01), McNeeley et al.
patent: 4140470 (1979-02-01), Pasch et al.
patent: 4185955 (1980-01-01), Holmes et al.
patent: 4198037 (1980-04-01), Anderson
patent: 4251479 (1981-02-01), Pecht et al.
patent: 4260360 (1981-04-01), Holmes et al.
patent: 4285659 (1981-08-01), Kolke
patent: 4302175 (1981-11-01), McNeely
patent: 4304806 (1981-12-01), Anderson et al.
patent: 4359443 (1982-11-01), Michaels
patent: 4372741 (1983-02-01), Cane et al.
patent: 4374636 (1983-02-01), Holmes
patent: 4427353 (1984-01-01), Omiya et al.
patent: 4439128 (1984-03-01), Louik et al.
patent: 4466934 (1984-08-01), Cane et al.

Affiliated with

Also associated with

Rating

Molding apparatus for producing centrally-apertured discs does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Molding apparatus for producing centrally-apertured discs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molding apparatus for producing centrally-apertured discs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1745879