Hand held spray gun and air valve

Claim 1

A device of the character described for dispersing by air flow a liquid contained in a source remote from the device, and wherein the liquid supply can be maintained in readiness in the device without pressure at the source greater than atmospheric, said device comprising: an elongated body of external dimensions suitable for holding in the hand, and having an upper end and a lower end, a front face and a rear face, a pair of bores extending through the body from end to end, with their axes in generally parallel relation in a plane extending from the front face to the rear face, the foremost bore providing an air passage and the rearmost bore providing a liquid passage, the bores each having a relatively small diameter valve section in the upper region for reception of a reciprocable valve member, an entrance at the lowermost region for reception of a conduit fitting, and an intermediate section between the valve section and the entrance, the diameter of the intermediate section being greater than that of the valve section, and a valve seat at the junction of the valve section and the intermediate section, a valve member in the valve section of each bore, each of said valve members comprising a cylindrical portion slidably fitting in the valve section bore, with an end of the cylindrical section extending upwardly from the upper end of the body, a valve head adapted to close against the valve seat, a compression spring in the rearmost bore adapted to bear at one end against a stop and at the opposite end against the valve head in such bore, the valve member disposed in the foremost of said bores being slotted, a rigid barrel with a bore therethrough extending forwardly from the front face and having air communication with the forward bore in the body, a rigid liquid tube within the bore of the barrel extending through the slot in said slotted valve member, and having communication with the rearmost bore in the body; the relative inside diameter of the barrel and the external diameTer of the liquid tube providing an annular air passage and an open forward end of said tube being disposed inwardly of the forward end of said barrel to provide a mixing area within said barrel for liquid and air admitted thereto by said valves; a nozzle on said barrel in communication with said mixing area, an operating handle pivotally mounted on the body adjacent the rear face and provided with a plane flat valve actuating surface, and a depending portion for hand gripping, the relation of the pivotal mounting, the valve actuating surface, and the upper ends of the valve members being such that when the handle is squeezed toward the forward face of the body the air valve is first shifted to admit air into the bore of the barrel, and thereafter the valve member in the liquid passage is actuated to afford liquid flow through the liquid tube, and when the handle is released the liquid valve shuts first and the air valve shuts last.

Claim 2

A device of the character described for dispersing by air flow a liquid contained in a source remote from the device, and wherein the liquid supply can be maintained in readiness in the device without pressure at the source greater than atmospheric, said device comprising: an elongated body of external dimensions suitable for holding in the hand, and having an upper end and a lower end, a front face and a rear face, a pair of bores extending through the body from end to end, with their axes in generally parallel relation in a plane extending from the front face to the rear face, the foremost bore providing an air passage and the rearmost bore providing a liquid passage, the bores each having a relatively small diameter valve section in the upper region for reception of a reciprocable valve member, an entrance at the lowermost region for reception of a conduit fitting, and an intermediate section between the valve section and the entrance, the diameter of the intermediate section being greater than that of the valve section, and a valve seat at the junction of the valve section and the intermediate section, a valve member in the valve section of each bore, each of said valve members comprising a cylindrical portion slidably fitting in the valve section bore, with an end of the cylindrical section extending upwardly from the upper end of the body, a valve head adapted to close against the valve seat, a compression spring in the rearmost bore adapted to bear at one end against a stop and at the opposite end against the valve head in such bore, the valve member disposed in the foremost of said bores being slotted, a rigid barrel with a bore therethrough extending forwardly from the front face and having air communication with the forward bore in the body, a rigid liquid tube within the bore of the barrel extending through the slot in said slotted valve member, and having communication with the rearmost bore in the body; the relative inside diameter of the barrel and the external diameTer of the liquid tube providing an annular air passage and an open forward end of said tube being disposed inwardly of the forward end of said barrel to provide a mixing area within said barrel for liquid and air admitted thereto by said valves; a nozzle on said barrel in communication with said mixing area, an operating handle pivotally mounted on the body adjacent the rear face and provided with a plane flat valve actuating surface, and a depending portion for hand gripping, the relation of the pivotal mounting, the valve actuating surface, and the upper ends of the valve members being such that when the handle is squeezed toward the forward face of the body the air valve is first shifted to admit air into the bore of the barrel, and thereafter the valve member in the liquid passage is actuated to afford liquid flow through the liquid tube, and when the handle is released the liquid valve shuts first and the air valve shuts last.