Air supply pressure regulator with supply tank pressure gauge and air supply port

An air pressure regulating apparatus with gauging of remaining supply tank pressure comprising:

• a regulator body having two ends and an axial bore therein,
• said axial bore having a wall surface, said wall surface between said two ends defining a low pressure cavity;
• a high pressure cavity axially disposed inside said axial bore, said high pressure cavity communicating at a first end with a supply of compressed air communicating through one of said two ends of said regulator body and at a distal end with said low pressure cavity;
• a piston, said piston having a head portion dimensioned to reciprocate in cooperative sealed engagement within said high pressure cavity, said piston having an exterior circumference portion dimensioned to reciprocate in cooperative sealed engagement with said wall surface of said low pressure cavity;
• said piston having a passageway therethrough having an inlet communicating with said high pressure cavity through said head portion, said passageway communicating with an outlet aperture at a second end, said outlet aperture communicating with said low pressure cavity;
• an outlet chamber located in said regulator body adjacent to said low pressure cavity;
• said low pressure cavity selectively communicating with said outlet chamber by activation of an inflation switch from a biased closed position to an open position, said inflation switch providing communication between said low pressure cavity and said outlet chamber only when in said open position;
• a means for pressure regulation for maintaining said compressed air in said low pressure cavity communicated from said high pressure cavity, at a substantially constant predetermined pressure, said means for pressure regulation mounted upon said head portion of said piston in a position to interrupt communication between said outlet aperture and said low pressure cavity when said predetermined pressure is achieved in said low pressure cavity;
• and
• means to visually display the pressure of said supply of compressed air being communicated to said high pressure cavity, attached to said regulator body.