Static molds – Core – Including means to expand or contract core
Patent
1977-08-12
1979-01-16
Husar, Francis S.
Static molds
Core
Including means to expand or contract core
249153, 249183, B28B 730
Patent
active
041345690
ABSTRACT:
A gate for opening and closing a longitudinal joint of a core used in casting concrete pipe has a pair of hinge plates pivotally connected to each side of the core adjacent the joint. A pair of over-center links pivotally connect to the hinge plates and to a pair of coordinator links. The coordinator links pivotally connect, as well, to a displaceable one of the core sides. A remotely controlled actuator acting between the hinge plates and the over-center links opens and closes the gate. The pivotal connections of the coordinator links to the displaceable side of the core, the coordinator links to the over-center links, and the over-center links to the hinge plates are such that in a closed position with both sides of the core abutting and with opening rotation of the over-center links about their pivot with the hinge plates, the pivot between the over-center links and the coordinator links during opening first passes through center before moving away from the joint. With continued opening, the over-center links rotate and carry with them the coordinator links and displaceable core side. The position of the pivot between the hinge plates and the over-center links is eccentric and can be varied by a wheel rotatable with respect to the hinge plate and pin locked. Opening and closing of the gate is preferably by an actuator acting between the hinge plates and the over-center links.
REFERENCES:
patent: 3164877 (1965-01-01), Lee
patent: 3656732 (1972-04-01), St. John
Ameron Inc.
Husar Francis S.
McQuade John
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