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Tensioning apparatus and method of applying tension to a tendon

  • US 4,192,215 A
  • Filed: 08/28/1978
  • Issued: 03/11/1980
  • Est. Priority Date: 05/05/1975
  • Status: Expired due to Term
First Claim
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1. A tensioning apparatus adapted for employment with two torque wrenches coacting with only a plane surface of a body to induce torsion-free axial tensile stress in a linear member which extends from the body generally perpendicularly to the plane surface, the apparatus comprising:

  • wedge gripper means having an opening formed axially therethrough for generally concentric mounting on the linear member, an inner surface for gripping engagement of the linear member, and a tapered outer surface;

    a sleeve member having an opening formed axially therethrough for generally concentric mounting on said wedge gripper means, a tapered inner surface for mateable contact and interaction with wedge gripper means tapered outer surfaces, and an outer surface with screw threads formed on a reduced diameter portion thereof and a separate and distinct integrally formed enlarged wrench engageable surface formed on another portion thereof for positive mateable mechanical engagement by one of the two wrenches, the enlarged wrench engagable surface having an outer dimension greater than the maximum thread diameter; and

    a nut having an opening formed axially therethrough from end to end thus providing an inner surface with the inner surface having screw threads formed thereon for threadable contact with said sleeve member'"'"'s threaded surface, an integral, enlarged wrench engageable surface formed on the outer surface thereof for positive mateable mechanical engagement by the other of the two wrenches, and a plane surface formed on one end thereof for mateable contact with the plane surface of the body, wherein said enlarged wrench engageable surfaces on said sleeve member and said nut cooperate to limit the travel of the threaded portion of the nut on the threaded portion of the sleeve in one direction only.

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