Patents Assigned to Preload Concrete Structures, Inc.
  • Apparatus and method for winding a wire around a structure
    Patent number: 4826091
    Abstract: Apparatus and methods for winding a wire around a periphery of a structure. The wire is connected to the structure and then pulled around that structure in a manner that produces a high tension in a portion of the wire and that winds that high tension portion of the wire around the structure. The high tension portion of the wire is monitored to detect any flaws in the wire coating or cover, and the locations of these flaws are recorded.
    Type: Grant
    Filed: November 6, 1987
    Date of Patent: May 2, 1989
    Assignee: Preload Concrete Structures, Inc.
    Inventors: Nicholas A. Legatos, Andrew Tripp, Jr., Bill R. Bush
  • Apparatus for prestressing concrete structures or the like
    Patent number: 4801103
    Abstract: Apparatus for prestressing concrete structures or the like by wrapping tensioned wire around the peripheral walls of the same includes a carriage which travels about the periphery of the structure, a device mounted on said carriage for paying off wire from a wire supply, a wire tensioning mechanism which includes at least one pair of stress wheels which the wire at least partially encircles, a tensiometer, a tensioned wire payout device which is adjustable to pay out wire at selectable heights relative to the carriage, a slip clutch linked to at least one of the stress wheels and being adjusted to slip when torque transferred from the tension in the wire is applied to the clutch and exceeds a predetermined torque value thereby allowing the tension in the wire to be controlled, and a driving motor mounted to the carriage to propel the carriage about the periphery of the structure.
    Type: Grant
    Filed: February 5, 1987
    Date of Patent: January 31, 1989
    Assignee: Preload Concrete Structures, Inc.
    Inventors: Bill R. Bush, Andrew Tripp, Jr., Tadeusz J. Marchaj
  • Apparatus for prestressing concrete structures or the like
    Patent number: 4659033
    Abstract: Apparatus for prestressing a concrete structure or the like by wrapping tensioned wire around the peripheral wall of the same includes a carriage which travels about the periphery of the structure, a device mounted on the carriage for paying off wire from a wire supply, a wire tensioning mechanism which includes at least one pair of stress wheels each of which the wire at least partially encircles, a tensiometer, a tensioned wire payout device which is adjustable to pay out wire at selectable heights relative to the carriage, a slip clutch linked to at least one of the stress wheels and being adjusted to slip when torque transferred from the tension in the wire is applied to the clutch and exceeds a predetermined torque value thereby allowing the tension in the wire to be controlled, and a driving motor mounted to the carriage to propel the carriage about the periphery of the structure.
    Type: Grant
    Filed: June 29, 1984
    Date of Patent: April 21, 1987
    Assignee: Preload Concrete Structures, Inc.
    Inventors: Bill R. Bush, Andrew Tripp, Jr., Tadeusz J. Marchaj