Patent ID: 6715561
Filing Date: 2004-04-06
Classification: A62C,Y10S

Abstract:
A vacuum dry sprinkler system comprising:a fire extinguishing fluid supply line; a control system operably connected to said fire extinguishing fluid supply line, said control system configured to maintain said fire extinguishing fluid supply line at below atmospheric or negative pressure during a non-activated condition and forward a fire extinguishing fluid to said fire extinguishing fluid supply line upon being exposed to pressure equal to or greater than atmospheric pressure in response to a fire; and a vacuum dry sprinkler head in fluid communication with said fire extinguishing fluid supply line, said vacuum dry sprinkler comprising: a sprinkler body configured for coupling to said fire extinguishing fluid supply line, said sprinkler body having a central orifice, said central orifice having an outlet, a pair of frame arms extending from said sprinkler body a preselected distance from said outlet, a sealing assembly sealing positioned within said outlet of said orifice, a deflector carried by said pair of frame arms, a thermally sensitive trigger positioned between said sealing assembly and said deflector, said trigger configured to releasably urge said sealing assembly into sealing engagement with said outlet of said central orifice, wherein said thermally sensitive trigger is actuated upon exposure to a preselected temperature to thereby release said sealing assembly, an expulsion member urging said sealing assembly away from said outlet when said thermally sensitive trigger releases said sealing assembly, and a thrust member carried by said pair of frame arms and operably connected to said sealing assembly, said thrust member tensioned about said frame arms to apply a lateral force to said sealing assembly to thereby thrust said sealing assembly laterally away from said sprinkler body when said thermally sensitive trigger is actuated and said expulsion member urges said scaling assembly away from said outlet to thereby prohibit said sealing assembly from reseating on said outlet as a result of negative pressure imparted on said scaling assembly from said outlet of said orifice.