US 6,527,203 B2 · Two-component dispensing gun

Abstract

A two-component dispensing gun has two longitudinally-extending dispensing passages receiving metering rods and in fluid communication with two feed passages adjacent to an especially configured metering rod tip and valve seats formed at the exit end of each dispensing passage. Valve seats of the dispensing passage extend as protrusions from the gun nose and are sealingly received within cup shaped recesses formed in a detachable, throwaway nozzle having a static mixing chamber. The nozzle has a truncated cone configuration which, in combination with the geometric configuration of the dispensing and feed passages alleviates turbulent flow of the liquid components until reaching the static mixer within the nozzle. A cammed surface on each metering rod in combination with a yoke crossbar formed as part of the gun's trigger provides increased motion of the trigger for fine or slow metering applications of the gun.

Claims10

Dependent claims

A detachable nozzle for use in a liquid two-component dispensing gun having a flat front surface defined as a nose from which a pair of valve seat openings are formed in two protrusions that extend from said nose of the gun, said nozzle comprising:

said nozzle having a back plate filling and closing one end thereof;
said back plate having a pair of cup shaped recesses for receiving said protrusions when said nozzle is attached to said dispensing gun with said back plate adjacent or abutting said nose of said dispensing gun;
each cup shaped recess having a valve extension seat opening at a base thereof in registry with said valve seat opening in said protrusion;
and,
said back plate and said protrusions are plastic and an exterior surface of the base of each cup shaped recess has a sealing ring concentric with the valve seat extension opening formed in the base of the cup-shaped recess, said sealing ring deforming or being deformed by an end face of the protrusion when the nozzle is affixed to the dispensing gun.

2 more elements

In a detachable nozzle for use in a dispensing gun for spraying polyurethane foam or froth by separately ejecting two liquid components supplied under pressure to said gun through a pair of metered valve seat openings formed in two protrusions extending from a flat nose surface at the front of the gun, the improvement comprising:

a) a nozzle having an integral back plate fused thereto filling and closing one end thereof;
said back plate having a pair of cup shaped recesses for receiving said protrusions when said nozzle is attached to said dispensing gun with said back plate adjacent or abutting said nose of said dispensing gun;
each cup shaped recess having a valve extension seat opening at a base thereof in registry with the valve seat opening in said protrusion;
said nozzle one end in the shape of said back plate having a cross-sectional configuration defined by a pair of generally parallel straight edges spanning t & distance between said valve seat openings with each straight edge terminating at each of its ends with a semi-circular edge generally concentric with said valve seats, said cross-sectional configuration of said one end extending a longitudinal distance generally equal to the depth of said cup shaped recess;
b) said nozzle having a hollow inlet chamber adjacent said one end thereof, a cylindrical mixing chamber adjacent said inlet chamber containing a static mixer therein and a dispensing tip adjacent said mixing chamber;
the intersection of said mixing chamber and said inlet chamber having a generally circular cross-sectional configuration;
and,
c) said inlet chamber having a configuration defined by the interior surfaces of nozzle wall portions including a pair of spaced curvilinear wall portions, each curvilinear wall portion extending from said semi-circular edge at said one end of said cylinder to said circular intersection in a generally frusto-conical shape and a pair of generally flat wall portions, each flat wall portion extending from one of said straight edges to said circular intersection in a generally triangular shape.

5 more elements

Dependencies are inferred from the claim text.

Two-component dispensing gun

Life of this patent

Two-component dispensing gun

Life of this patent

Abstract

Claims10