Patent ID: 7197919

Claim:
A pressure gauge for operative engagement with a gas pressurized system, comprising: a housing having an engagement means for the operative engagement of said gauge with said gas pressurized system; a pressurized gas inlet orifice being formed in said housing for inletting pressurized gas into said housing; a cylindrical bore being formed within said housing; a piston being slidably engaged within said cylindrical bore such that varying gas pressure will cause slidable motion of said piston within said cylindrical bore; a resistance means being disposed within said cylindrical bore to provide a resistive force to said movement of said piston; a calibration rod consisting of a single, cylindrical, integrally formed member including a threaded portion, said calibration rod being disposed proximate said piston, whereby movement of said piston will cause movement of said calibration rod; a pressure indicator bar being engaged to said calibration rod and functioning to provide an indication of the pressure level of said gas; wherein said pressure indicator bar has a central bore having a threaded portion thereof, and said calibration rod is disposed within said central bore and extends throughout said central bore, and wherein a threaded engagement is formed between said threaded portion of said calibration rod and said threaded portion of said central bore; and wherein said pressure indicator bar has an outer end that projects from said housing with user readable pressure indica thereon, and wherein an outer end portion of said central bore is disposed within said outer end of said pressure indicator bar, and wherein said threaded portion of said central bore is disposed within said outer end of said pressure indicator bar, and wherein an outer end of said calibration rod includes said threaded portion of said calibration rod, and said outer ends of said central bore and said calibration rod are threadably engaged.