Patent ID: 8567749

Claim:
An elongated hollow mould and chair combination for the formation of an integral raised sill or hob on the surface of a cast-in-situ concrete building slab, said mould being elongated and hollow and comprising two generally parallel, continuous side panels joined in fixed spatial relationship at their upper and lower edges by upper and lower spacer elements which permit the entry of concrete from above and the passage of concrete therethrough to formwork below upon which said slab is to be formed, thereby making the concrete within said filled mould contiguous with that of said concrete slab beneath; said mould being supported upon a plurality of discrete chairs, each said chair comprising two narrow, parallel, vertically oriented side panels joined at their lower ends by a transverse bottom part fixed to said formwork, said mould being supported in a said chair by a transverse bridge which may be fixed at any particular height along said chair side panels, joining members shaped to engage the ends of said mould and incorporating overlapping doublings being employed to join sections of said mould.