Patent ID: 6193110
Filing Date: 2001-02-27
Classification: B29B

Abstract:
An internal mix dispenser, comprising:a dispenser body forming a cavity having a rear portion with cylindrical walls and a forward portion with a pair of opposed planar walls, said forward cavity portion having a smaller cross-section than said rear cavity portion with a transverse wall body portion therebetween,a valving-mixing assembly movably carried within said dispenser body between a forward dispensing position and a rearward non-dispensing position, said valving mixing assembly including a piston portion at its rear, a spring forwardly of the piston portion with a forward portion that is engagable with the transverse wall portion of said dispenser body, a valving-mixing forward portion including a central bore closed at its rear and extending forwardly to an outlet opening, a pair of opposed planar sides, a large passageway extending from one of the planar sides to the central bore, a small passageway extending from the other of the planar sides to the central bore,liquid component delivery means adapted to be fastened to said dispenser body, said component delivery means providing a first passageway for delivery of resin and a first seal surrounding said first passageway and being adapted to seat on the planar side of one valving-mixing portion having the large passageway, and providing a second passageway for delivery of catalyst and a second seal surrounding the second passageway and being adapted to seat on the other planar side of the valving-mixing portion, said first and second seals and said planar walls of the valving-mixing portion cooperating to block the resin and catalyst when the valving-mixing assembly is in the rearward non-dispensing position, anda closure for said cavity removably attachable to the rear of said body, said closure forming, with said rear portion of the cavity, an air cylinder,said body having a compressed air inlet into its rear portion rearwardly of the piston portion of the valving-mixing assembly so that the admission of compressed air into the air inlet moves the valving-mixing assembly forwardly within said dispenser body to the dispensing position where said large and small passageways of valving-mixing portion are in communication with said first and second passageways of the liquid component delivery means for the admission of resin and catalyst to the central bore for mixing and dispensing, said forward movement compressing said spring so that upon release of the compressed air from said rear body, said spring returns said valving-mixing assembly to the non-dispensing position.