Patent ID: 7121520
Filing Date: 2006-10-17
Classification: B28B,E04B

Abstract:
1. A formwork for pre-cast concrete panels comprising: a base which is provided with an island region for forming an opening in the concrete panels or a reduced thickness region compared to surrounding areas in the concrete panels; a pair of parallel fixed spaced apart side panels attached to the base; and a pair of parallel moveable spaced apart side panels; wherein said island region is positioned between the parallel moveable spaced apart side panels and wherein said parallel moveable spaced apart side panels are removably secured to the parallel fixed spaced apart side panels in a tight manner in a distance from the center of the island region, wherein a subsidiary formwork is assembled thereon to the formwork in which the subsidiary formwork comprises a pair of longitudinal spaced apart panels across the pair of parallel fixed spaced apart side panels wherein the inner sides of the longitudinal spaced apart panel form the sides of a mould and the upper surface of the concrete in the formwork forms the base of the mould, said mould is designed to receive concrete such that on setting, a projecting edge is formed, wherein in the subsidiary formwork, the distance apart between each member of the set of longitudinal spaced apart panel is variable such that the casted longitudinal edge is of a variable pre-determined width.