US 5,585,066 AGranted

Multiple utilization of working air

OwnerRonald Weissinventor

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Abstract

The procedure is designed for the pneumatic operation of a device in which at least one structural element is pneumatically actuated. The actuation is done by primary working air, which is fed to the pneumatic structural element from a primary working-air supply. In addition to the primary working-air supply at least one secondary working-air supply is used, which is provided with a lower pressure level than that of the primary working-air supply. After the execution of a working operation by a pneumatic structural element by means of a compressed-air supply from the primary working-air supply, during a transition phase a venting into the secondary working-air supply is carried out. After the transition phase a venting of the first pneumatic structural element vis-a-vis an ambient pressure is carried out. A second pneumatic working operation is powered by air from the secondary working-air supply.

Claims8

Dependent claims

In a blow molding apparatus in which a container of a thermoplastic material is fabricated, a procedure for the multiple utilization of working air to effect actuation of pneumatic structural elements, said procedure comprising:

feeding a temperature treated preform into a blow molding station, having a blow mold for contouring the container;
stretching said preform within said blow molding station by supplying pressurized fluid to a cylinder for moving a stretching rod, said cylinder being supplied with pressurized fluid from a secondary pressurized fluid supply at a pressure less than a predetermined pressure to effect a portion of the movement of said stretching rod;
expanding the preform within the blow mold by supplying pressurized fluid from a primary working fluid supply, said pressurized fluid being supplied at said predetermined pressure;
venting said pressurized fluid from said preform to said secondary pressurized fluid supply during a transition phase;
venting said pressurized fluid in said preform to atmosphere subsequent to venting to said secondary pressurized fluid supply;
and
said cylinder being supplied with pressurized fluid from said secondary pressurized fluid supply subsequent to venting of said pressurized fluid from said preform to said secondary pressurized fluid supply.

4 more elements

Dependencies are inferred from the claim text.