Patents Assigned to Wink H. Kopcynski
  • Patent number: 4381695
    Abstract: A hydraulically operated pump jack utilizing dual hydraulically operated piston and cylinder assemblies for pivoting the beam of the pump jack and including a unique control arrangement associated with a reversing valve for controlling operation of the piston and cylinder assemblies. The control arrangement includes a hydraulically operated holding valve incorporated into each of the conduits between the reversing valve and the hydraulically operated piston and cylinder assemblies combined with a control piston and cylinder assembly for controlling the operation of the holding valves. A manually operated valve assembly is also incorporated into each conduit to enable conversion of either or both of the piston and cylinder assemblies from double acting to single acting.
    Type: Grant
    Filed: August 1, 1980
    Date of Patent: May 3, 1983
    Assignee: Wink H. Kopcynski
    Inventor: Ethridge F. Ogles