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Pumping system for mobile protective coating spray apparatus and other applications

  • US 4,684,062 A
  • Filed: 06/28/1985
  • Issued: 08/04/1987
  • Est. Priority Date: 06/28/1985
  • Status: Expired due to Fees
First Claim
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1. A hydraulic drive cylinder assembly comprising top and bottom manifolds and a hydraulic cylinder tube mounted therebetween fabricated of non-magnetic material, said manifolds having hydraulic oil communication ports formed therein, a hydraulic piston within the said hydraulic cylinder tube comprising, at least in part, magnetic material;

  • upper and lower magnetic-responsive reed-type proximity limit switches positioned at either end of said cylinder and electrically responsive through combination electric network means and hydraulic network means to the presence of the magnetic material in the hydraulic piston to alternately activate solenoid valve means connected to hydraulic pressure generating means from a first position in which said solenoid valve means directs said hydraulic piston in one direction to a second solenoid valve means position in which said solenoid valve means directs said hydraulic piston in the other direction of a reciprocating cycle, said solenoid valve means having selectively communicating hydraulic oil passageways on the exterior surface thereof in matching alignment with selectively communicating hydraulic oil passageways formed in said top manifold, said solenoid valve means being mounted immediately juxtaposition to and integrally and contiguously with said top manifold by fastener means to provide selectively communicating hydraulic oil pathways between said top manifold and said solenoid valve means, thus ease of replacement is facilitated, interchangeability and serviceability are improved, and requirements for hard electrical wiring and hydraulic drive cylinder assembly component space requirements are reduced.

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