Abstract: A particle control screen includes a support layer. A first filter layer is disposed around the support layer. A second filter layer is disposed around the first filter layer. A third filter layer is disposed around the second filter layer. Each of the filter layers has a pore size. The pore size of the third filter layer is greater than the pore size of the second filter layer. The pore size of the second filter layer is greater than the pore size of the first filter layer.

Abstract: A particle control screen includes a support layer. A first filter layer is disposed around the support layer. A second filter layer is disposed around the first filter layer. A third filter layer is disposed around the second filter layer. Each of the filter layers has a pore size. The pore size of the third filter layer is greater than the pore size of the second filter layer. The pore size of the second filter layer is greater than the pore size of the first filter layer.

Abstract: A unitized seal assembly for use with roller or ball bearing assemblies is disclosed. The unitized seal assembly includes, among other things, a radially outer ring and a radially inner deflector ring. The outer ring includes a first shield element which defines a first sealing face. The radially inner deflector ring includes a second shield element which defines a second sealing face. The second sealing face is dimensioned and configured so as to correspond to the first sealing face such that when the first shield element is positioned in non-contacting proximity to the second shield element, a circuitous sealing labyrinth is formed between the first sealing face and the second sealing face.

Abstract: Disclosed is a labyrinth seal assembly for sealing an annular gap defined between a bore of a housing and an outer surface of a cylindrical shaft, wherein the housing and shaft are relatively movable. The seal assembly includes radially inner and radially outer shield rings. The radially inner shield ring has an inner surface which is adapted and configured for support by the shaft. The radially outer shield ring is partially disposed within the sealing channel of the inner shield ring. The outer shield ring includes a casing member, foam seal elements, and a shield element retainer. The foam seal elements depend radially inward into the sealing channel so as to form a circuitous sealing labyrinth therein. The seal elements are formed preferably from polyurethane. A highly viscous fluid is disposed within the circuitous sealing labyrinth.

Abstract: Disclosed is a labyrinth seal assembly for sealing an annular gap defined between a bore of a housing and an outer surface of a cylindrical shaft, wherein the housing and shaft are relatively movable. The seal assembly includes radially inner and radially outer shield rings. The radially inner shield ring has an inner surface which is adapted and configured for support by the shaft. The radially outer shield ring is partially disposed within the sealing channel of the inner shield ring. The outer shield ring includes a casing member, foam seal elements, and a shield element retainer. The foam seal elements depend radially inward into the sealing channel so as to form a circuitous sealing labyrinth therein. The seal elements are formed preferably from polyurethane. A highly viscous fluid is disposed within the circuitous sealing labyrinth.

Abstract: A unitized seal assembly for use with roller or ball bearing assemblies is disclosed. The unitized seal assembly includes, among other things, a radially outer ring and a radially inner deflector ring. The outer ring includes a first shield element which defines a first sealing face. The radially inner deflector ring includes a second shield element which defines a second sealing face. The second sealing face is dimensioned and configured so as to correspond to the first sealing face such that when the first shield element is positioned in non-contacting proximity to the second shield element, a circuitous sealing labyrinth is formed between the first sealing face and the second sealing face.

Abstract: An improved endless belt conveyor apparatus includes a supporting frame in the form of a pair of parallel longitudinal carrier rails that flank the endless belt in a plane below the upper carrying run of the belt. The carrier rails extend continuously from end-to-end of the conveyor and have uninterrupted trolley supporting portions that are adapted to support wheeled trolleys for movement therealong. The apparatus may be readily converted from a belt conveyor to an animal feeding apparatus that includes a reciprocating plow assembly by mounting such a plow assembly in a carriage that has wheeled trolleys that ride on the trolley supporting portions of the carrier rails. The conveyor frame structure also permits easy addition of the drive components for the reciprocating carriage.

Abstract: A silo unloader is of the type having a tripod with inwardly and upwardly inclined legs, including a main leg and lateral legs, surmounting the wall of a cylindrical silo, and a silo unloader mechanism has three generally radially extending horizontal support arms to each of which is secured a suspension cable trained over a sheave at the upper end of one of the tripod legs to suspend the mechanism in the silo. Each of the sheaves is journalled in a yoke which is freely suspended at the upper end of a tripod leg, and because of the way the suspension cables must run from the winch to the sheaves, the yokes are displaced from a vertical suspension by the load on the cables. The structure of the support arms permits securement thereto of the three suspension cables at points which compensate for the displacement of the sheave yokes, so as to cause each cable to hang effectively vertically from the sheave over which it is trained.

Abstract: A top silo unloader is of the type which has a cutter-conveyor pickup arm, an impeller, a drive ring above the cutter-conveyor pickup arm, and support arms in a horizontal plane above the drive ring to which suspension cables are connected for moving the unloader vertically in the silo. Improved support arms have downwardly and outwardly extending offset portions outside the drive ring which have their free ends in a plane above the bottom of the cutter-conveyor pickup arm, and means on the free ends of the offset portions to receive the suspension cables.