Abstract: A basket 1 of vibratory screening apparatus comprises inflatable elastomeric member 3 positioned to overlie a part of a screen member 5, 7 mounted in the basket. Inflation of the inflatable elastomeric member 3 causes it to press against a screen frame 7 of the screen member, clamping it against a support 9, 29 of the basket 1. Preferably the inflatable elastomeric member 3 is deflatable and a reservoir 19 may be provided for vented inflation fluid. The screen member may be pre- or post-tensioned. The basket 1 may comprise supports 29 and inflatable elastomeric member 3 positioned to press against parts of the screen member remote from its periphery.

Abstract: A clamping device for a screen member in vibratory screening apparatus comprises a frame member 1 on which is mounted an inflatable stocking 7. In use, the clamping device is inserted into the basket 21 of the screening apparatus so as to overlie the screen member, and the inflatable stocking 7 is expanded so as to press the screen member against a portion 17, 19, 31 of the basket 21 while the clamping device reacts against a further portion 17, 19, 33 of the basket 21. This pressure from the stocking 7 holds the screen member in place. Preferably the screen member has a screen 13 mounted in a frame 15 and the stocking 7 presses against this screen frame 15. The stocking 7 may press against the periphery of the screen member only or may press against other parts of the screen member as well.

Abstract: A filtering screen is described comprising: a first filter mesh, a second filter mesh having a different mesh size from the first and overlying the first mesh, and an apertured support to which both of the meshes are bonded so as to maintain the two meshes in tension, the tension in one of the meshes being greater than that in the other. At least one other filter mesh may be bonded over the first two meshes. The support may comprise a plate of fiber reinforced material having apertures formed therein which are much greater in area than the openings in the filter mesh, or a sheet of metal in which apertures are formed and in which edge regions of each aperture are turned through approximately 90.degree. to extend normal to the plane of the sheet from the underside thereof to increase the rigidity of the sheet. The frame may alternatively be a honeycomb structure or an apertured metallic plate, the filter meshes being joined to the surface of the frame.

Abstract: Vibratory screening apparatus wherein a filtrating cradle incorporating screens is vibrated on a machine base, and wherein a bottom screen (56) in said cradle (12) can be withdrawn between an upper support (64) on said cradle and an intermediate support (54) on a bottom screen frame (52), which frame is also withdrawable from the machine on a lower support (62) on the cradle, hydraulic expander means (60) being provided to act on the lower support so that, in the inserted position of the bottom screen frame, the opposed sides of the bottom screen can be clamped between the upper and intermediate supports, locking the bottom screen and its support in position.

Abstract: A vibratory screening machine as described separating solid particles from liquid in which a fine mesh screen (30) includes an inclined region extending upwardly to a discharge edge (34) over which solid material (36) separated by filtration can pass. Vibration of the screen (30) causes the solid particulate material to move towards the discharge edge (34).The screen (30) forms the base of a reservoir having sides (10) and a weir or dam (46) at the opposite end to the discharge edge (34) and is slidable in and out to provide for cleaning and/or replacement.A suspension of liquid and solid particulate material is supplied to the machine along a pipeline (28) and is discharged onto the rear end of the screen (30) from a discharge head (24).One or more intermediate screens of similar design may be located above the main vibrating screen and above one another and the suspension of liquid and solid material discharged onto each of the screens overflows onto the rear end of the screen immediately therebelow.

Abstract: A vibratory screening machine as described separating solid particles from liquid in which a fine mesh screen (30) includes an inclined region extending upwardly to a discharge edge (34) over which solid material (36) separated by filtration can pass. Vibration of the screen (30) causes the solid particulate material to move towards the discharge edge (34).The screen (30) forms the base of a reservoir having sides (10) and a weir or dam (46) at the opposite end to the discharged edge (34).A suspension of liquid and solid particulate material is supplied to the machine along a pipeline (28) and is discharged onto the rear end of the screen (30) from a discharge head (24).One or more intermediate screens of a similar design are located above the main vibrating screen and above one another and the suspension of liquid and solid material discharged onto the first screen overflows onto the rear end of the screen immediately therebelow. Trays (68) and (70) are provided to catch liquid draining through.