Tool for closing pipe couplings

Claim 1

A tool for closing pipe couplings between metal pipes, the end of one pipe being closingly engageable in a widened terminal part of the other pipe, a sleeve ring being pressed axially onto the widened part over the end face thereof, characterised by the following features: at least two pressing jaws (1, 2) movable towards and away from one another are mounted on a guide extending parallel to the pipe axis and are forked in the pipe-engaging zone to enable the tool to be so engaged on the pipes (4, 5) to be joined together as to extend transversely of the axis thereof; on one of the two pressing jaws (1 or 2) a forked part adjacent the other such jaw is widened in accordance with the diameter of the sleeve ring (7), the transition between the widened part and the unwided part being in the form of a shoulder (8) which extends perpendicularly to the pipe axis and which serves as axial abutment for the sleeve ring (7); the other pressing jaw (2) comprises a static outer forked part (9) and an inner forked part formed by two tongs-action clamping jaws (10); the outer ends of the clamping jaws (10) are half-shells (12) disposed in laterally inverted relationship to one another, the inner shell surfaces being adapted to the pipe periphery; the half-shells (12) are adapted on the inside edge (13) to the wall shape of the conical transition between the unwidened part and the widened part of the pipe; an actuating pin (16) disposed parallel to the direction in which the pressing jaws (1, 2) are guided is secured to the pressing jaw (1) having the static forked part and acts during the closing movement of the pressing jaws (1, 2) to close the clamping jaws (10), and means provided to actuate the pressing jaws.