Patent ID: 7401791

Claim:
A pipe gasket comprising: a toroidal gasket body configured to allow the gasket body to roll along a spigot end of an associated first pipe as the spigot end is received inside a bell end of an associated second pipe; and at least two projections extending away from a peripheral surface of the gasket body and spaced from one another around the peripheral surface, each projection including a first surface and a second surface which extend away from the peripheral surface at an angle, each first surface being inclined at a shallow angle to the peripheral surface and configured to facilitate rotation of the gasket body in a first rotational direction and each second surface being inclined at a steep angle to the peripheral surface and configured to inhibit rotation of the gasket body in a second, opposite, rotational direction, wherein each first surface is inclined in a similar direction with respect to the peripheral surface as the gasket body rolls along the spigot end of the associated first pipe.