Patents Assigned to Rapco, Inc.
  • Seal for a rotary vane pump
    Patent number: 8342828
    Abstract: A pump includes a housing and a shaft rotatable about an axis. The shaft has a shaft diameter and has a portion disposed within the housing. A plurality of retractable vanes is coupled to the shaft and each vane includes a first end that contacts the housing. A seal element is positioned to define a seal between the shaft and the housing. The seal element includes a first bushing, a second bushing, and a dry seal assembly including a wiper that defines a diameter that is smaller than the shaft diameter.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: January 1, 2013
    Assignee: Rapco, Inc.
    Inventor: John L. Wicht
  • SEAL FOR A ROTARY VANE PUMP
    Publication number: 20100034685
    Abstract: A pump includes a housing and a shaft rotatable about an axis. The shaft has a shaft diameter and has a portion disposed within the housing. A plurality of retractable vanes is coupled to the shaft and each vane includes a first end that contacts the housing. A seal element is positioned to define a seal between the shaft and the housing. The seal element includes a first bushing, a second bushing, and a dry seal assembly including a wiper that defines a diameter that is smaller than the shaft diameter.
    Type: Application
    Filed: July 30, 2009
    Publication date: February 11, 2010
    Applicant: RAPCO, INC.
    Inventor: John L. Wicht
  • Method and apparatus for measuring vane wear in a sliding vane rotary pump
    Patent number: 7216526
    Abstract: The amount of wear on the vanes of a sliding vane rotary pump is determined by inserting a wear inspection dip stick into a wear inspection port providing in a housing of the sliding vane rotary pump. The wear dipstick includes one or more mark providing an indication of the amount of wear on the vanes, and a marking member which provides an indication of current vane length and allows a maintenance person to easily determine when a pump replacement is required.
    Type: Grant
    Filed: June 3, 2004
    Date of Patent: May 15, 2007
    Assignee: Rapco, Inc.
    Inventors: Michael R. Lotzer, Richard W. Plenkers, Mark A. Gaulke