Clamping element for clamping apparatus for fixing e.g. copper pipe to be widened, has clamping portion formed by material projections, which partly circulate over periphery of retainer without displacement towards axis

摘要

The element (1) has retainers (3, 3.1-3.5) curved around an axis (2) to accommodate a pipe to be widened. A side wall (4) of each retainer comprises a clamping portion (5) brought against the pipe in an operative position to bring the pipe against a counter section in a clamping position. The clamping portion is formed by material projections (6.1, 6.2), which continuously run over periphery of the retainer without displacement towards the axis, where cross section area of the material projections is outwardly reduced. Independent claims are also included for the following: (1) a device for widening a pipe (2) a device for flanging a pipe.