Apparatuses and methods for perforating tubing.

摘要

Corrugated tubing (13) is advanced along its axial path (A) by rotatably driven lead screw members (19) the screw threading (20) of which is in meshing engagement with the corrugations of the tubing (21), the lead screw members (19) being in pairs with the screw threading (20) of the lead screw members (19) of each pair being of opposite hand and the lead screw members (19) of each pair being rotated in opposite directions. The lead screw members (19) of each pair present outwardly directed cutters (36) which are synchronized substantially simultaneously to intersect the tubing (13) thereby, in perforating the tubing (13), to restain the tubing (13) against rotation thereof about the axial path (A). A slide member (56) is preferably slidably and non-rotatably mounted by a splined connection (57) on each lead screw member (19) with the associated cutter or cutters (36) mounted on the slide member (56) for rotation therewith during operative rotation of the lead screw member (19), the slide member (56) being slidably moved along the lead screw member (19) by the advancing tubing (13) during intersection of tubing (13) by the associated cutter or cutters (36) with the slide member (56) and associated cutter or cutters (36) being returned to the initial position thereof between intersections of the tubing (13) by the cutter or cutters (36). There is also disclosed a method of producing the lead screw members (19) with the outwardly projecting cutters (36) mounted thereon.