Abstract: A modular screening panel in which the apertures in the screening surface extend through the surface and the shape of the aperture parallel the plane of the panel surface varies with the depth of the aperture so that as the surface wears the visible shape of the aperture changes. The apertures can be any convenient shape at the surface but at the depth which means the worn panel needs replacing the shape is distinctly different to the shape of the apertures in a new or partly worn panel.

Abstract: A sifter has a casing that is detachably coupled with a screen unit that also has a casing. A sifter handle is configured for detachable coupling to a conventional electric knife drive.

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cradle incorporating screens is vibrated on a machine base, and wherein a bottom screen (56) in said cradle (12) can be withdrawn between an upper support (64) on said cradle and an intermediate support (54) on a bottom screen frame (52), which frame is also withdrawable from the machine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: Apparatus for transferring heat between solid particles includes placing a first granular material composed of particles of a first size on the upper side of a downwardly sloping vibratory screen. The openings in the screen are sufficiently small to prevent passage therethrough of the particles of the first material. A second granular material composed of particles of a second size, smaller than the first size, is spread over the first material on the screen to mix with and sift through the first material as the screen is vibrated. The size of the particles of the second material is small enough to allow passage through the openings in the screen. The first and second materials are at different temperatures so that as the particles of the two materials mix, heat is transferred between the particles. After mixing and heat transfer, the first material flows off the lower edge of the screen where it can be gathered, and the second material flows through the screen where it likewise can be gathered.

Abstract: A method and apparatus for use in separating oversize from on size particles in a mass of particulate materials passed rapidly through a screening device includes a sloping screen mesh having sizing openings dimensioned to be larger than the desired maximum on size particles intended to pass through the mesh. The screen mesh is supported at a relatively steep slope angle and the cosine of the angle of the slope multiplied times the mesh opening size is set up to be substantially equal to the desired maximum on size particles to be passed through the screen mesh. A particle rebound shield is spaced closely above the upper surface of the screen mesh for reflecting and directing particles that bounce off the screen mesh back towards the openings therein.