Patent ID: 7311265
Filing Date: 2007-12-25
Classification: B05B

Abstract:
1. A hand-held, air-assisted spraying apparatus for applying a liquid coating formulation of the type that requires at least a first and a second component be combined to produce a coating on a surface, at least one of the components including a catalyst therein, the spraying apparatus comprising: a spray housing having a flow channel extending therethrough; a reservoir assembly mounted to the spray housing, the reservoir assembly having at least a first and a second liquid-holding compartment, each liquid-holding compartment being connected through an outlet port into fluid communication with the flow channel, each liquid-holding compartment being isolated from fluid communication with the other liquid-holding compartment, a first and a second rotatable element respectively disposed in fluid communication with each liquid-holding compartment, each rotatable element having a predetermined displacement such that, upon a full rotation thereof, predetermined equal volumes of liquid are dispensed through the outlet port from its associated liquid-holding compartment, wherein the first and the second rotatable elements are mechanically connected through a speed-reducing arrangement so that the rotatable elements rotate at different rotational speeds, such that in use, the relative amounts of liquids dispensed from the respective liquid-holding compartments into the flow channel are in a predetermined ratio regardless of the rate at which the liquids flow from their respective liquid-holding compartments.