Feeder for apparatus for ejecting a mixture of a plurality of li

Details Feeder for apparatus for ejecting a mixture of a plurality of li Feeder for apparatus for ejecting a mixture of a plurality of li

1978-02-02

1980-04-22

Freeh, William L.

Pumps

Condition responsive control of drive transmission or pump...

Plural pumps with individual or relative control

447 2, 137 99, 13710121, 425130, F04B 130, G05D 700

Patent

active

041993039

ABSTRACT:
A feeder for apparatus for ejecting a mixture of liquids, e.g. urethane foam, comprises a pair of swash plate proportioning pumps one individual to each of the liquids, e.g. resin and isocyanate, each proportioning pump being fed by a gear pump from a supply of the respective liquid. Seepage along the drive shafts of the isocyanate pumps is continuously removed by bathing them in a recirculating stream of flushing agent. The swash plate and gear pumps and flushing agent pump are all driven by a single motor from a common chain drive. The liquids are heated during passage through separate hoses to a common dispensing head or gun, by immersed coil electric resistance heaters extending lengthwise freely within the hoses. A novel control system is provided for the hose heater circuit, the adequacy of the liquid supply and other operating conditions.

REFERENCES:
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patent: 3415264 (1968-12-01), Brown et al.
patent: 3921901 (1975-11-01), Woodman

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