Apparatus for in-pipe use

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 41/00 (2006.01) F16L 55/28 (2006.01)

Patent

CA 2223840

Apparatus for cutting a hole through a plastic liner in a gas or other main comprises a body (10) forming module of a train of modules adapted to travel through the main. The body (10) has a radially movable platform (12) carrying a cutter. The platform (12) has four cams (70) engaging four cams (68) pivotally mounted on tie-bars (22, 24). Advancing movement of the platform (12) pushes the cams (68) outwardly causing support legs (60, 62, 64, 66) to move outwardly and to cause four slave legs carried by the support legs to engage the plastic liner. Further advancing movement of the platform (12) causes the cutter to engage the liner and also holds the support legs in their advanced position as noses on the cams (70) traverse the faces of the cams (68).

Cette invention concerne une machine pour percer les chemises plastiques d'une conduite de gaz ou autre, qui comprend un corps (10) formant un module constitué d'un train de modules conçu pour circuler à l'intérieur de la conduite. Le corps (10) possède une plate-forme (12) pouvant se déplacer radialement et portant une lame. La plate-forme (12) possède quatre cames (70) fixant quatre autres cames (68) montées en pivot sur des barres de raccordement (22, 24). L'avancée de la plate-forme (12) repousse les cames (68) vers l'extérieur, ce qui fait que les bras de soutien (60, 62, 64, 66) sortent et que les quatre bras esclaves portés par les bras de soutien se fixent sur la chemise plastique. L'avancée de la plate-forme (12) se poursuivant, la lame se fixe sur la chemise et les bras de soutien se maintiennent en position sortie, tandis que des becs disposés sur les cames (70) se déplacent à la surface des cames (68).

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