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String to tube or cable connector for pulling tubes or cables through ducts

  • US 6,786,473 B1
  • Filed: 03/21/2003
  • Issued: 09/07/2004
  • Est. Priority Date: 03/21/2003
  • Status: Active Grant
First Claim
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1. A connector for connecting a pull string to a tube for pulling the tube through a duct, the connector comprising:

  • 1) a first means for connecting the pull string to the tube; and

    2) a second means for converting a tension force applied to the pull string into a rotational force about a pivot point between the connector and an obstructing edge, the connector rotating about the pivot point as the tension force is increased, the second means for converting further comprising, a) a header with an axial hole for the pull string to pass through, the header made of a solid material;

    b) an elastic cylinder connected to the header, the elastic cylinder axially unstable under compression; and

    c) a joiner that connects the cylinder to the tube;

    whereby the tension force is converted to the rotational force; and

    whereby the header becomes unstable at the pivot point and slips past the obstructing edge, enabling the connector to pass by the obstructing edge.

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