Bacon & Thomas
Diaphragm type pressure measuring device
 A diaphragm type pressure measuring device including a conical diaphragm having a top and a peripheral bottom edge, a pressure probe raised from the top of the conical diaphragm, a guard connected to the peripheral bottom edge of the conical diaphragm and disposed around the pressure probe and having an upright top flange raised from the periphery of a top rim thereof, and a cover adapted for covering on the upright top flange of the guard, wherein when an air pressure is applied to the conical diaphragm, the pressure probe is forced by the conical diaphragm to to cause a movement subject to the value of the applied air pressure. 
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G01L G01L A43B G01L
inventional inventional inventional inventional
Tien-Tsai
Huang