US 5,165,604 AGranted

Air supply and control assembly for an automatic spray gun

OwnerWilliam H. Copp, Jr.inventor

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Abstract

An air supply and control assembly for use with a spray gun comprises an assembly to couple a first source of pressurized air which controls the needle valve of a spray gun to a pilot valve connected to a second source of pressurized air to control delivery thereof to the spray gun atomizing component. The assembly includes a manifold connected by one port to the first source of air, by a second port to components operating the needle valve, and by a third port to a coupling passageway connected to the pilot valve. A check valve in the coupling passageway allows air from the first source to flow freely to a chamber in the pilot valve which, on receipt of air from the first source, opens to flow air from the second source to the atomizing component, and impedes return flow of air from the chamber back to the manifold after the first source of air has been discontinued which thereby keeps the pilot valve open to continue flow of air from the second source to the atomizing component for a selected time period until all of the air from the first source in the pilot valve chamber has escaped. The check valve is adjustable to alter the time delay of the pilot valve in closing. To provide a high volume low pressure (HVLP) supply of atomizing air to the atomizing component a venturi member draws ambient air in to combine with pressurized air from the second source.

Claims16

Dependent claims

A pressurized air supply and control assembly for use with an automatic spray gun, comprising pressurized air control means to provide pressurized air to a said spray gun to initiate flow of an atomizable liquid therefrom, first connecting means to connect said pressurized air control means to a controlled pressurized air source, second connecting means to connect said pressurized air control means to liquid flow initiating means of a said spray gun, atomizing pressurized air supply means operable between an air flow open and air flow closed position to provide pressurized air when in said air flow open position to a said spray gun to atomize a said atomizable liquid when its flow is initiated from a said spray gun and to discontinue flow of pressurized atomizing air to a said spray gun when in said flow closed position, third connecting means to connect said atomizing pressurized air supply means to an atomizing pressurized air source, fourth connecting means to connect said atomizing pressurized air supply means to atomizing means of a said spray gun, and time delay means connected between said pressurized air control means and said atomizing pressurized air supply means to delay operation of said atomizing pressurized air supply means from its air flow open position to its air flow closed position for a preselected time period after flow of pressurized air from said controlled pressurized air source to said pressurized air control means has been discontinued.

Dependencies are inferred from the claim text.