Patent ID: 7637165

Claim:
A pressure measuring manometer comprising: a. a pressure chamber fluidly connected to a test environment; b. a diaphragm element; c. a linear gear rack comprising a plurality of adjacent aligned gear teeth and an alignment spur d. a pinion gear comprising a plurality of radial aligned gear teeth; e. an indicator needle; f. a cover unit with at least one viewing window and having at least one set of calibrated pressure measurement indicia thereupon; wherein at least one of said plurality of adjacent aligned gear teeth of said linear gear rack engage upon at least one of said plurality of radial aligned gear teeth of said pinion gear; wherein said alignment spur is in close proximity of said pinion gear at a point directly opposite whereby at least one of said plurality of adjacent aligned gear teeth of said linear gear rack engage upon at least one of said plurality of radial aligned gear teeth of said pinion gear; wherein said alignment spur acts upon said pinion gear to maintain said pinion gear teeth and linear gear rack teeth is close engagement; wherein said diaphragm element is adjacent to said pressure chamber and is connected to said linear gear rack; wherein said indicator needle is attached to said pinion gear; whereupon a change in pressure in a test environment induces a change of pressure in said pressure chamber and thereby causes deflection of said diaphragm element; wherein said deflection of diaphragm element causes linear movement of said linear gear rack which is translated into rotation of said pinion gear and of said indicator needle; wherein position of the indicator needle is viewable through at least one viewing window of said cover unit and said calibrated measurement indicia; wherein said pressure measurement of the said test environment is determined by correspondence of said indicator needle with said calibrated measurement indicia; and wherein linear movements of 0.03 inch or greater are measured.