초록 ▼

An apparatus for applying a foamable fluid plastic material including reactant fluids that form a foam when heated and mixed. A reactant fluid dispenser supplies the reactant fluids to a heated applicator gun mixing chamber at a constant flow rate despite any differences in viscosity. A valve needle

An apparatus for applying a foamable fluid plastic material including reactant fluids that form a foam when heated and mixed. A reactant fluid dispenser supplies the reactant fluids to a heated applicator gun mixing chamber at a constant flow rate despite any differences in viscosity. A valve needle extends into the mixing chamber and exposes fluid inlet openings when retracted, permitting the reactant fluids to flow into the mixing chamber. When advanced, the needle closes off the fluid inlet openings and dispenses the mixed fluids. A heater prevents the gun from drawing heat energy from initial quantities of the pre-heated reactant fluids which would prevent initial quantities of the fluids from reacting properly. The valve needle is disposed in a sleeve that defines the mixing chamber and is disposed in a sleeve receptacle of the gun. The fluid inlet openings may be disposed through a portion of a wall of the sleeve that includes a flat exterior surface that is disposed against a corresponding flat surface of the sleeve receptacle, the mixing chamber fluid inlets opening through the flat sleeve receptacle surface. A seal may be disposed around each mixing chamber fluid inlet between the respective flat portions of the sleeve and the sleeve receptacle to seal those surfaces against the escape of reactant fluids.

대표청구항 ▼

[ We claim:] [1.]1. An apparatus for applying a multi-component foamable fluid plastic material, the material including at least two reactant fluids configured to form a foam when heated and mixed, the apparatus comprising:an applicator gun including:a support body structure, a mixing chamber suppor

[ We claim:] [1.]1. An apparatus for applying a multi-component foamable fluid plastic material, the material including at least two reactant fluids configured to form a foam when heated and mixed, the apparatus comprising:an applicator gun including:a support body structure, a mixing chamber supported in the support body structure and configured to receive two reactant fluids for mixing;two mixing chamber fluid inlets disposed in the support body structure in fluid communication with the mixing chamber and configured to direct the respective reactant fluids into the mixing chamber through respective fluid inlet openings; anda reactant fluid dispenser connected to the applicator gun and configured to supply at least one of the reactant fluids to the applicator gun mixing chamber through at least one of the mixing chamber fluid inlets at a constant flow rate to continuously provide the first reactant fluid in proper proportion to a second one of the reactant fluids despite viscosity and/or density differences between the two fluids;the cross-sectional areas of the fluid inlet openings being different, the cross sectional areas being measured perpendicular to the direction of reactant fluid flow through the fluid inlet openings.