Rotary low pressure air displacement pump

Claim 1

A multiple pump assembly for supplying fluid under different fluid pressure outputs to a plurality of utility devices, comprising in combination: a housing member for enclosing the pump assembly; a support mounted in said housing member; a plurality of pumps circumferentially mounted on said support about a central region of said support; each of said pumps comprising an inlet valve communicating directly with an ambient source of the fluid and an outlet valve communicating with one of the plurality of utility devices; each of said pumps further comprising a bellow member communicating with said respective inlet and outlet valves; a shaft rotatably mounted in proximity to said central region of said support; eccentric means secured to said shaft; a plurality of connecting rods interconnecting said eccentric means to said plurality of bellow members for providing uniform reciprocal displacement of said plurality of bellow members upon rotation of said shaft; and means establishing said plurality of bellow members to be of different bellow cross-sectional areas to provide different fluid pressure outputs to the plurality of utility devices upon rotation of said shaft.