Screen lining

Claim 1

A screen lining assembly comprising: a supporting substructure having at least one elongated bar provided with a plurality of throughgoing holes spaced along the bar; at least two screen elements having respective lateral edges extending parallel next to one another along and above the bar; a plastic section lying on the bar, interposed between the edges and the bar, and extending parallel to the bar, the plastic section having an upper region provided with formations engaging the lateral edges for holding same together and an underside formed at locations spaced along the plastic section with respective downwardly extending spreadable projections received in the holes and extending therethrough, whereby spreading of the projections locks the plastic section to the bar, each of the projections being formed with a vertically throughgoing passage having an inner wall surface and opening at the upper region; and a plurality of bolts each extending downward from the upper region into a respective one of the passages at least to the level of the substructure at the respective hole within the respective projection and having an outer wall surface, at least one of the surfaces being tapered away from the upper region to spread the respective projection on insertion of the respective bolt thereinto, the wall surfaces of the bolts and the passages being provided with mutually engaging locking means for retaining the bolts in the passage and locking each projection in the respective hole, whereby the projections securely retain the plastic section on the bar in spite of enlargement of the holes.