Backing ring assembly for pipes
AssigneeWelding Controls Limited
InventorRaymond Paul Griffiths
Life of this patent
Estimating the term…
Abstract
A backing and alignment ring assembly for insertion in pipes, particularly for welding purposes, comprising a segmented backing ring and a pair of axially spaced hub members connected to the backing ring by radially and axially extending connecting means. When the hub members are drawn together the backing ring is caused to expand and engage with the pipe bore.
Claims17
A backing and alignment ring assembly comprising a segmented backing ring having a cylindrical external surface for engagement in a pipe bore the segments of said ring being provided with inter-engaging and overlapping lips and recesses on said surface, a pair of spaced hub members located substantially on the axis of the ring, axially extending actuating means connected to the hub members for providing relative axial movement of the hub members, and radially and axially extending connecting means attaching each hub member to the ring whereby said relative axial movement of the hub members produces radial expansion or contraction of the ring.
A backing ring assembly comprising a segmented backing ring for engagement in a pipe bore, a pair of spaced hub members located substantially on the axis of the ring, axially extending actuating means connected to the hub members for providing relative axial movement of the hub members, and connecting means attaching each hub member to the ring comprising a plurality of resilient elements which in an un-stressed condition lie on a conical surface and converge and terminate in the hub member, said resilient elements being formed from a thin-walled frusto-conical member provided with a plurality of radially extending slits whereby said relative axial movement of the hub members produces radial expansion or contraction of the ring.
Dependencies are inferred from the claim text.