Mold clamping device

Details Mold clamping device Mold clamping device

1988-09-29

1989-09-12

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to close mold

425451, 425591, 425DIG223, B29C 4567

Patent

active

048655376

ABSTRACT:
In the present invention, an inner space of a clamping cylinder is divided into a front oil chamber and a rear oil chamber for liquid pressure by a piston section of a clamping ram, the front oil chamber and the rear oil chamber are connected with each other by a connecting path which is bored in the piston section of the clamping ram, and the front oil chamber is connected to a charge tank via a second open-close valve. In the clamping ram, an oil chamber for mold closure and an oil chamber for mold opening are formed by slidably fitting a high speed piston therein. A first open-close valve, which opens or closes the connecting path of the piston section of the clamping ram, is slidably fitted on the rear end section of the clamping ram. An oil chamber for valve opening, which is formed between the first open-close valve and the outer face of the clamping ram, is connected to the oil chamber for mold opening via a through-hole bored in the clamping ram.

REFERENCES:
patent: 4158327 (1979-06-01), Aoki
patent: 4380427 (1983-04-01), Hehl
patent: 4545756 (1985-10-01), Hiroshi et al.
patent: 4565116 (1986-01-01), Hehl
patent: 4605367 (1986-08-01), Gatjahr
patent: 4744740 (1988-05-01), Kojima

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