B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
B22D 17/20 (2006.01) B22D 17/14 (2006.01) B29C 33/10 (2006.01)
Patent
CA 2114581
A valve assembly for venting diecasting moulds comprises a venting channel means, a venting valve communicating with the venting channel arid having an axially displaceable valve closure member, and an actuating member for operating the venting valve from an open position into a closed position. The actuating mem- ber includes a power pick up member exposed to the liquid cast- ing material escaping during the casting operation from a cast- ing chamber provided in the diecasting mould through the venting channel and being axially displaceable under the influence of the kinetic energy transmitted from the liquid casting material to the power pick up member when the liquid casting material hits the power pick up member. The power pick up member is me- chanically coupled to the axially displaceable valve closure member and includes an axially displaceable push member having an operating stroke whose length is limited to only a fraction of the length of the stroke performed by the axially displace- able valve closure member when it is driven from its open posi- tion to its closed position. The axially displaceable valve clo- sure member freely moves along a path in addition to the operat- ing stroke of the power pick up member. The actuating member further comprises a power transmission member for the transmis- sion of the impact force exerted by the liquid casting material onto the power pick up member to the axially displaceable valve closure member of the venting valve.
Cassan Maclean
Fondarex F. Hodler & Cie. S.a.
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