Static molds – Including means to apply force to remove or release product...
Patent
1974-04-12
1976-04-27
Annear, R. Spencer
Static molds
Including means to apply force to remove or release product...
264335, 425251, 425252, 425437, 425DIG232, 425DIG102, B29C 700
Patent
active
039529916
ABSTRACT:
A mass of a hardenable synthetic resin such as polyurethatne is introduced into a mold cavity and is allowed to harden at least partially. Thereafter a piston having a face contiguous with an inside surface of the cavity is retracted away from the hardened mass in a bore formed in one of the mold halves. The mold is then opened and a gas is fed into the bore at a location between the retracted piston and the mass so as to pneumatically eject the hardened mass from the mold. The piston is formed with a plurality of circumferential grooves adjacent its face, these grooves filling with synthetic-resin material during use so as to form a seal around the piston. A pair of orifices open into the bore of this piston; one of the orifices is connected the source of pressurized gas, the other is connected to a passage opening into the atmosphere. The piston is formed with a lateral groove constituting a chamber into which both of the orifices open when the piston is in the advanced or molding position so that gas does not leak into the mold cavity of the piston, but is exhausted to the atmosphere.
REFERENCES:
patent: 3362046 (1968-01-01), Blumer
patent: 3706515 (1972-12-01), Keuleber et al.
Annear R. Spencer
Charvat Robert J.
Dubno Herbert
Krauss-Maffei Aktiengesellschaft
Ross Karl F.
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