Fire extinguishers – Sprinkler heads
Patent
1994-11-08
1997-05-13
Pike, Andrew C.
Fire extinguishers
Sprinkler heads
169 38, 169 39, A62C 3714
Patent
active
056283679
ABSTRACT:
A sprinkler head includes a powdered metal base including external threads for threadably engaging a water pipe, and a stamped metal frame attached to the base. The base defines a passageway for receiving water from the water pipe and an opening to the passageway. The powdered metal base is infiltrated with copper or vacuum infiltrated anaerobic resin to provide a hydrostatically leak tight composition capable of withstanding 700 psi. A deflector is attached to the frame for distributing water dispensed from the opening. A circular plate or circular spring sealingly covers the opening, and a pip is engaged with the frame creating a space therebetween. A frangible bulb is positioned in the space between the Belleville spring. The frangible bulb is made of a temperature-sensitive material that fractures at a predetermined temperature and thus allows water pressure from water in the water pipe to unseat the spring and thus spray water. A capacitor discharge weld is shown for connecting the frame to the base and for connecting the base to the pip so that the frangible bulb is retained with a predetermined force despite dimensional variation in the frangible bulb.
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Metals Handbook, 9th Edition, vol. 6, on welding, brazing, and soldering, published by the American Society of Metals, copyright 1983, "Percussion Welding", pp. 740-742.
Retzloff James G.
Truax Perin E.
Pike Andrew C.
The Viking Corporation
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