Patents Assigned to HydroTech International, Inc.
  • Patent number: 3931670
    Abstract: A releasable pull plug arranged for mounting inside the end of one of the pipes or conduits with the plug having clips for disengageably engaging the internal surface of one of the conduits and locking the plug against axial movement relative thereto. A line is attached to the plug and extends axially through the other conduit for exerting a pulling force thereon whereby the two conduits may be drawn together by pulling on the line. The plug is provided with fluid pressure actuated release means for disengaging the clips, and means are provided for applying pressurized fluid to the release means to thereby release the plug. Means are also provided which are operable in response to the activation of the release means for holding the locking means in the disengaged position independently of the fluid pressure, whereby the plug after release may be withdrawn through the other conduit by pulling on the line. The plug may include means for sealing the end of the conduit in which the plug is mounted.
    Type: Grant
    Filed: April 25, 1974
    Date of Patent: January 13, 1976
    Assignee: HydroTech International, Inc.
    Inventor: James F. Arnold