Roll grooving apparatus

Abstract

A roll grooving apparatus has a back-up roller, a grooving roller positioned vertically below the back-up roller, and a hydraulic jack positioned directly vertically below the grooving roller, with the hydraulic jack exerting an upward force to push the grooving roller towards the back-up roller to form a circumferential groove in a pipe segment that is positioned between the rollers.

1 - 11 . (canceled) 
   
   
       12 . A roll grooving apparatus and power drive unit in combination, the combination comprising:
 a back-up roller and a grooving roller of the roll grooving apparatus, the back-up roller and the grooving roller positioned in mutual proximity with axes thereof arranged in mutually parallel positions;   one or the back-up roller and the grooving roller engaged with the power drive unit; and the other of the back-up roller and the grooving roller supported by a movable platform of the roll grooving apparatus, the movable platform in contact with a jacking device of the roll grooving apparatus:   a pair of transverse support bars of the roll grooving apparatus resting on carriage rails of the power drive unit in supporting the weight of the roll grooving apparatus;   the jacking device extendable and retractable over a range of motion, with extendable motion thereof drawing the back-up roller and grooving roller into mutually intimate proximity, and with retractable motion of the jacking device drawing the back-up roller and the grooving roller into mutually distant proximity.