Patents Assigned to Ralph W. Earl Company, Inc.
  • Patent number: 4763487
    Abstract: A refrigerated mobile cargo container having side and rear platforms for loading and unloading cargo and hydraulic control valves for regulating the raising and lowering of the platforms. Fluid to the control valves can be supplied from either a primary pump system powered by the refrigeration unit prime mover or by a secondary pump system powered by a twelve volt power supply. Each pump system has its own fluid reservoir. Check valves are provided which prevent the fluid from one pump system from being passed into the other pump system.
    Type: Grant
    Filed: May 4, 1987
    Date of Patent: August 16, 1988
    Assignee: Ralph W. Earl Company, Inc.
    Inventor: Robert G. Wicks