Patent ID: 7311120

Claim:
A pipe stopper for inserting within a pipe comprising: two rigid circular plates; an ouwardly-expandable flexible seal located between peripheral surfaces of the plates; a projection rigidly secured to or integral with a first of the plates and extending slideably through an aperture defined by the second plate; a lever pivotable about an axis through the projection; cam means rigidly secured to or integral with the lever such that said lever is pivotable between a first orientation in which the flexible seal is relatively undistorted and a second orientation in which the cam means force the plates towards each other so as to axially compress and radially expand the seal for engaging with sealing contact with a wall of a pipe; and a member rigidly secured to or integral with only a part of a remote peripheral surface of one of the plates, said member extending from the plate at a position such that when the pipe stopper is located within a pipe said member provides a reactive force to tilting of the pipe stopper from its operative position while said lever is pivoted to its second orientation to expand the flexible seal.