×

Moving device for intervening inside small-diameter pipework

  • US 5,640,780 A
  • Filed: 06/01/1995
  • Issued: 06/24/1997
  • Est. Priority Date: 06/08/1994
  • Status: Expired due to Fees
First Claim
Patent Images

1. A moving device for intervening inside small-diameter pipework, the device comprising a drive piston made up of at least two annular tractor cups each having a flexible and strong peripheral skirt of the same outside diameter, and each defining a sealed section of inside surface, wherein said drive piston includes at least a third non-sealing centering cup disposed between said two tractor cups, and supports for said cups, said supports being interconnected axially in pairs by means of a cable and a fixed spring surrounding said cable and having ends that bear against said supports for two consecutive cups, said fixed spring providing traction between two consecutive cups with said cable being slack when said device is in a straight position and said fixed spring enabling said cable to be tensioned when said device is in a laterally flexed position.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×