Abstract: A container filling machine comprises a plurality of filling stations each including a container platform which is raised and lowered by a cam controlled elevating mechanism, for providing bottom-up filling; a cam-controlled pumping mechanism operating a piston pump for drawing fluid into the pump during a charge cycle, and pushing the fluid out of the pump during a discharge cycle; and an adjustable crank lever mechanism is included in the cam controlled pumping mechanism for providing adjustment of the volume of fluid being pumped. Operating in common with the filling stations are a pair of cams for operating the valves of each station, and in combination with each cam-controlled pumping mechanism provide greater than 180.degree. of machine time for continuously filling a container during the discharge cycle for each station.

Abstract: A piston pump mechanism includes a plunger head slideably mounted within a cylindrical sleeve member. The plunger head has an upper portion forming a shoulder and a reduced lower portion around which an inner ring of resilient material is mounted. An outer ring of resilient material, such as tetrafluroethylene, for example, is mounted around the inner ring. A piston rod has an end coupled to the transverse face of the reduced portion of the plunger head in such manner to provide axial adjustment therebetween, and a pressure cap is mounted upon this end. The pressure cap has a cylindrical like peripheral rim for applying a progressively greater axial force against the inner ring, causing the inner ring of material to apply a progressively greater radial force against the outer ring, as the piston rod and cap assembly are axially adjusted toward the plunger head, until the outer ring of material seals against the interior wall of the sleeve.