Screen assembly for vibrating screening machine

A screen assembly as set forth in claim ,.wherein said screen comprises an undulating coarse supporting screen, and an undulating fine screening screen bonded to said coarse screen on the opposite side of said coarse screen from said plate.

A screen assembly for a vibratory screening machine said assembly comprising a substantially planar plate, a plurality of apertures in said plate, said plate comprising elongated spaced plate members on opposite sides of said plurality of apertures, a screen formed in an undulating shape with elongated substantially parallel ridges having downwardly sloping sides, troughs formed between said downwardly sloping sides for conducting material which is being screened, undersides on said troughs, bonding means for bonding said undersides of said troughs to said spaced plate members on the opposite sides of a plurality of said apertures, means for securing said substantially planar plate to a vibratory screening machine, said undulating screen comprising an undulating screening screen and an undulating apertured plate formed in the same undulating shape as said screening screen and located in underlying relationship thereto and bonded to said substantially planar plate.

A screen assembly for a vibratory screening machine comprising a substantially planar plate having a length and a width, an area defined by said length and width, a plurality of first plate members on said plate extending in the direction of said length, a plurality of second plate members on said plate extending in the direction of said width, a plurality of apertures defined by said first and second plate members with said plurality of apertures extending both in said direction of said length and said direction of said width, a screen formed in an undulating shape to provide a screening area which is larger than said area of said plate, said undulating screen including a plurality of alternating parallel ridges and troughs, said ridges further including side walls extending toward said plate and defining said troughs, undersides on said plurality of troughs, said undersides of said plurality of troughs being bonded to certain of said plate members where said undersides of said troughs overlie said certain of said plate members, and said plurality of ridges which comprise said screening area which is larger than the area of said plate being oriented in spaced relationship to said plate and being spaced from and overlying said plurality of apertures.