Mechanism for purging a plural component mixing and dispensing g

Details Mechanism for purging a plural component mixing and dispensing g Mechanism for purging a plural component mixing and dispensing g

1979-03-13

1981-02-24

Spar, Robert J.

Dispensing

Plural sources, compartment, containers and/or spaced jacket

With discharge assistant for each source

15 35, 137268, 222149, B67D 110

Patent

active

042522552

ABSTRACT:
A gun for mixing and dispensing plural component plastic materials, for example, polyurethane foam, is provided with a purging device operable independently of the foam mixing and dispensing mechanism. The purging device comprises a rod, normally positioned rearwardly of the foam component inlet orifices and mixing chamber, the rod being selectively actuable independently of the foam mixing and dispensing operations, by a two way air cylinder controlled by the gun operator. Purging elements, for example, compressible spheres or plugs of a plastic material such as styrene are fed under pressure to seat in a position rearwardly of the foam component inlet orifices and mixing chamber. Upon selective actuation of the rod, one of the spheres is forced through the mixing chamber to purge any residual foam components by a scraping action.

REFERENCES:
patent: 1495008 (1924-05-01), Feagin
patent: 3146477 (1964-09-01), Bergman et al.
patent: 3175240 (1965-03-01), Hillard
patent: 3263928 (1966-08-01), Gusmer
patent: 3366337 (1968-01-01), Brooks et al.
patent: 3531813 (1970-10-01), Hurst
patent: 4050955 (1977-09-01), Southgate
patent: 4133483 (1979-01-01), Henderson

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