Pipe clamp device

In a pipe clamp device for the compression of a sealing gasket relative to a socket and spigot joint forming part of an assembly including a socket-carrying pipe and a spigot-carrying pipe, a shoulder being provided on the socket-carrying pipe, a clamping ring comprised of a plurality of interconnectable portions each having a peripheral gasket-engaging surface adapted for disposition around the spigot-carrying pipe, said gasket engaging surfaces forming a substantially continuous gasket engaging surface when assembled, compression means operatively connecting said portions and acting between said portions in a direction substantially parallel to a tangential direction such that compressing operation of said compression means causes radially inward contraction of said portions and consequential radial compression of the gasket, an annular anchor device provided for disposition around the socket-carrying pipe adjacent the joint and having an internal peripheral surface engageable with a shoulder on the socket-carrying pipe, and connecting means adapted to connect the clamping ring to the anchor device for applying a generally axial clamping force between the clamping ring and anchor device and thereby to the gasket, the improvement wherein:

• the internal peripheral surface of the anchor device comprises two pairs of curved surfaces, said curved surfaces in each pair being diametrically opposed to one another when the anchor device is disposed around the socket-carrying pipe, each curved surface extending for only a part of said internal peripheral surface, the internal radius of one pair of said curved surfaces being different from the internal radius of the other pair of said curved surfaces for enabling one of said pairs of said curved surfaces to match a shoulder on a different outer diameter socket-carrying pipe, around which the anchor device is disposed, than the other pair of said curved surfaces.