Split mould for making tapered concrete poles - is fitted without any clamping bolts and has opening and closing controlled by utilising mould taper itself

摘要

A tapered mould consisting of a rigid outer frame formed of a set of radially arranged longitudinally extending guide members and a set of axially spaced encircling rings. A gapped furstoconical tubular casing of resilient sheet material has a set of longitudinal stiffening members for sliding engagement with the respective guides. The gap in the wall of the tubular casing, extending along a longitudinal line on the periphery of the casing, is opened and closed automatically as the the tubular casing inserted in outer frame is moved axially in opposite directions. Labour-consumming bolt-clamping and releasing operation is completely eliminated and the mould operation can be mechanised. Packing means interposed between a pair of stiffening members arranged on the opposite sides of the gap further ensures leak-proof gap closing.