Apparatus for dispensing a mixture of mutually reactive liquids

Apparatus for dispensing a mixture of mutually reactive liquids, comprising a metal housing, a plastic mixing chamber disposed in the housing, the mixing chamber having a bore therethrough, means to deliver mutually reactive liquids along separate paths through said housing and mixing chamber and into said bore to mix in said bore and be dispensed through one end of said bore, said means comprising a metal valve housing for each said liquid, a valve in each valve housing, the valve housings extending through the plastic mixing chamber to the bore, an abutment shoulder on each valve housing that contacts an abutment shoulder on the plastic mixing chamber, and means to force each valve housing in the direction of the bore a distance such that the abutment shoulders of the valve housings first contact the abutment shoulders of the mixing chamber and then upon further movement toward the bore compress the plastic material of the mixing chamber.

Apparatus for dispensing a mixture of mutually reactive liquids, comprising a metal housing, a plastic mixing chamber disposed in the housing, the mixing chamber having a bore therethrough, means to deliver mutually reactive liquids along separate paths through said housing and mixing chamber and into said bore to mix in said bore and be dispensed through one end of said bore, said means comprising a metal valve housing for each said liquid, a valve in each valve housing, the valve housings extending through the plastic mixing chamber to the bore, a purging rod that reciprocates in said bore to clean the bore, and a scraper that surrounds the purging rod when the purging rod is retracted, the scraper being disposed in a counterbore in the plastic mixing chamber closely adjacent said valve housings.

Apparatus for dispensing a mixture of mutually reactive liquids, comprising a housing, a mixing chamber disposed in the housing, the mixing chamber having a bore therethrough, means to deliver mutually reactive liquids along separate paths through said housing and mixing chamber and into said bore to mix in said bore and be dispensed through one end of said bore, a purging rod that reciprocates in said bore to clean the bore, and a scraper that surrounds the purging rod to clean the purging rod when the purging rod is retracted, the scraper comprising a cylindrical metal sleeve having a forward wall that extends radially inwardly from the sleeve and that terminates in an inner edge that closely surrounds the purging rod, and packing material in the sleeve behind said forward wall.

Apparatus for dispensing a mixture of mutually reactive liquids, comprising a housing, a mixing chamber disposed in the housing, the mixing chamber having a bore therethrough, means to deliver mutually reactive liquids along separate paths through said housing and mixing chamber and into said bore to mix in said bore and be dispensed through one end of said bore, said means comprising a valve housing for each said liquid, the valve housings extending through the mixing chamber to the bore, a valve in each valve housing in the form of a reciprocable needle valve that extends substantially full length of the valve housing and opens and closes an orifice in the end of the valve housing at the bore, packing in the valve housing through which the needle valve slides in sealed relationship, and a joint in the valve housing between the packing and the orifice by which the valve housing is divided into two separable sections.

Apparatus for dispensing a mixture of mutually reactive liquids, comprising a housing, a mixing chamber disposed in the housing, the mixing chamber having a bore therethrough, means to deliver mutually reactive liquids along separate paths through said housing and mixing chamber and into said bore to mix in said bore and be dispensed through one end of said bore, a purging rod that reciprocates in the bore to clean the bore, the end of the purging rod reciprocating between a forward position in which it is at least as far forward as said end of said bore and a rearward position in which it is spaced a short distance behind the points of introduction of the liquids into the bore, and means to introduce air under pressure radially into the bore through the side wall of the mixing chamber at a point between said points of introduction of the liquids and said rearward position of the end of the purging rod.