Fluid sprinkling – spraying – and diffusing – With cleaning means – drip collecting – waste disposal or soil... – Nozzle cleaner – flusher or drainer
Patent
1996-01-30
1998-02-24
Morris, Lesley D.
Fluid sprinkling, spraying, and diffusing
With cleaning means, drip collecting, waste disposal or soil...
Nozzle cleaner, flusher or drainer
239571, 1373291, 137496, B05B 1502
Patent
active
057204330
ABSTRACT:
A draw back valve for fluid applicators for controlling the dripping or deposit of fluid at the nozzle orifice. The invention features a poppet within a stem which serves as a "piston". In the open position, the poppet is disposed within a chamber that has sufficient clearance to permit unrestricted fluid flow. Once it is desired to shut off fluid flow, the poppet slides in the reverse direction and is disposed within a cylinder bore such that the poppet now functions as a "piston" causing the flow to reverse. The reverse flow creates a partial vacuum at the valve "nozzle" thus causing the fluid that was being dispensed to be drawn back into the nozzle, thus, eliminating drips or dried fluid at the tip. The invention is particularly well suited for use in hand-held hot melt glue guns, however, has application to other fields as well such as paint spraying.
REFERENCES:
patent: 2077938 (1937-04-01), Kuttner
patent: 3348520 (1967-10-01), Lockwood
Dexter Corporation
Morris Lesley D.
Ritchie William B.
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