Movable preform locator and blow air valve apparatus for a blow

Details Movable preform locator and blow air valve apparatus for a blow Movable preform locator and blow air valve apparatus for a blow

1974-10-11

1976-11-23

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Including shaping means comprising fluid pressure contacting...

264 94, 425DIG204, 425DIG216, 425DIG211, B29C 1702, B29C 1707

Patent

active

039934276

ABSTRACT:
A preform locator and blow air valve apparatus, for use in a stretch pin assembly in a blow molding machine that produces hollow thermoplastic articles, which functions as a positive blow air shut-off valve means in the absence of a preform in a mold assembly. A tubular valve body is mounted in a stretch pin assembly, with a longitudinally movable blow air nozzle means slidably mounted in the valve body for carrying the preform and locating and sealing the preform against a shoulder in a mold assembly on a blow molding machine. A stretch pin is slidably mounted longitudinally through the blow air nozzle means for stretching a preform mounted on the nozzle means. A blow air passage means is operatively formed through the tubular valve body and blow air nozzle means for admitting blow air under pressure into a preform located in the mold assembly, by said blow air nozzle means, for blowing the preform into a finished article. The blow air nozzle means is moved by mechanical means into an initial position for loading a preform thereon. The blow air nozzle means is movable toward the mold assembly by either a mechanical means or a pneumatic means. The blow air nozzle means is moved a first distance toward the mold to locate and seal a preform in a mold assembly, and in the absence of a preform on the blow air nozzle means, the blow air nozzle means is moved a second distance, whereby it functions as a valve to close the blow air passage means to prevent loss of high pressure blow air and the resultant high noise levels.

REFERENCES:
patent: 3525123 (1970-08-01), Cines et al.
patent: 3776991 (1973-12-01), Marcus
patent: 3781395 (1973-12-01), Uhlig
patent: 3850562 (1974-11-01), Takeuchi et al.
patent: 3865530 (1975-02-01), Jesselallee et al.

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