Abstract: A plurality of hollow rollers is located in the annular space between the inner and outer tapered raceways of a tapered bearing. Each hollow roller has an axial bore extending completely therethrough. The percent hollowness of each roller is uniform throughout its full length. The rollers may be preloaded between the races.

Abstract: A pressurized screening apparatus removes both bouyant contaminants and denser contaminants from a liquid suspension containing desirable fibers and contaminants. Both the undesirable bouyant contaminants and the undesirable denser contaminants are accumulated in the same section of the pressurized screening apparatus. If desired, the accumulating bouyant contaminants and denser contaminants may be intermittently removed from the pressurized screening apparatus.

Abstract: A substantially air-tight vat completely encloses the rotatable cylinder. The pulp slurry fed into the vat is compacted to form a mat of high consistency. The differential pressure across the circumferential wall of the rotatable cylinder washes the mat with liquid contained in the wash chamber. The mat is removed from the cylindrical wall of the rotatable cylinder to provide a low consistency pulp slurry.

Abstract: A machine knitting needle with an improved hook structure is disclosed. The hook includes a shank portion extending from the tapered part of the needle blade, a curved portion, and a portion overlapping the shank. At least a major longitudinal part of the overlapping portion has cross-sectional areas greater than the cross-sectional areas of the remainder of the hook.

Abstract: A hydraulically operated reciprocating piston and a differential force operated valve are both in continuous fluid contact with a pressurized cushion chamber as well as the piston chamber pressure. The valve position is a function of the cushion chamber pressure. The cushion chamber pressure is a function of the axial position of the piston. The values of these functions are such that the piston is reciprocated when the machine is operated. The valve is a sleeve coaxial with the piston.

Abstract: An annular cage for the rollers of a bearing is located in the annular space between two bearing races and is normally spaced from both races when concentric. The cage is so constructed that, when unbalanced forces on the cage during rotation in the bearing tend to move the cage from its concentric position into contact with a piloting surface, hydrodynamic forces are developed which act to keep the cage out of contact with that surface.

Abstract: The knitting needle is provided with a hook which is so shaped that in lateral cross-section more of the hook wire than usual is located near the inner periphery of the hook bend so as to decrease the maximum stress levels generated in the hook when compared to conventional needle hooks.

Abstract: The separator is a single integral annular member with an inclined annular wall interconnecting a radially inner annular flange which extends in one longitudinal direction and a radially outer annular flange extending on the opposite side of the inclined wall in the opposite longitudinal direction from the inner annular flange. The new roller thrust bearing comprises the single integral separator between two thrust races.

Abstract: In a shell type race for a thrust roller bearing comprising at least a planar race wall on which rollers may roll, and an axially extending, cyclindrical wall adapted to be inserted and located in a housing, the outer surface of the cylindrical wall has a plurality of resilient tongues projecting outwardly so as to be open toward the race wall.

Abstract: A folded spring extends relatively diametrically across the circle of rollers in a roller assembly with each diametral side pressing between two adjoining rollers to wedge these rollers apart circumferentially and thus to press all the rollers against the wall of the bore in a "keystoning" effect with sufficient force to prevent axial movement of the rollers and to radially retain the rollers in the body. The spring is arranged to be subsequently pushed axially from the body.

Abstract: The inner periphery or the outer periphery, or both, of one thrust race is radially spaced from the corresponding outer periphery or inner periphery, or both, of the other thrust race. A resilient seal is positioned in the radial space thus provided between the corresponding peripheries of the two thrust races. The sealing member includes a metal portion and an annular elastomeric portion adapted to seal the radial space between the peripheries of the thrust races.

Abstract: A hardened wear spot on a textile element is formed by applying high energy heat to a selected small area of the element which has been previously hardened and tempered to provide the proper spring characteristics for an operating textile element. The intensity and time of application of the high energy heat and the cooling after heat cut-off are carefully controlled to provide a small area of full hardness which is completely separated from the remaining tempered portion by a buffer zone of less hardness than either the tempered portion or the full hardness area.The new textile element made by this new method is a textile element with the major portion having a predetermined spring characteristic for an operating textile element. A small area of full hardness is located at a predetermined location to provide wear resistance. A buffer zone having less hardness than either the full hardness area or the major tempered portion completely separates the full hardness area from the major portion.

Abstract: A hardened wear spot on a textile element is formed by applying high energy heat to a selected small area of the element which has been previously hardened and tempered to provide the proper spring characteristics for an operating textile element. The intensity and time of application of the high energy heat and the cooling after heat cut-off are carefully controlled to provide a small area of full hardness which is completely separated from the remaining tempered portion by a buffer zone of less hardness than either the tempered portion or the full hardness area.The new textile element made by this new method is a textile element with the major portion having a predetermined spring characteristic for an operating textile element. A small area of full hardness is located at a predetermined location to provide wear resistance. A buffer zone having less hardness than either the full hardness area or the major tempered portion completely separates the full hardness area from the major portion.

Abstract: A hydraulically operated reciprocating piston and a differential force operated valve are both in continuous fluid contact with a pressurized cushion chamber as well as the piston chamber pressure. The valve position is a function of the cushion chamber pressure. The cushion chamber pressure is a function of the axial position of the piston. The values of these functions are such that the piston is reciprocated when the machine is operated. The valve may, for example, be a sleeve coaxial with the piston or a valve transversely spaced from the piston.

Abstract: A pre-loading structure between the driving member and the driven member removes torsional backlash from a universal joint by pre-loading a pair of blocks against and substantially encompassing the driving member. The blocks are dimensioned so that the inside of each block has surfaces which face one another in spaced relationship to provide a clearance between them to allow the blocks to be moved toward each other as wear occurs to continually maintain the pre-load between driving and driven member.

Abstract: A tappet or valve lifter is used in an internal combustion engine. The operation of the tappet is hydraulically controlled to selectively stop or start the operation of the engine combustion chamber poppet valve. Tappets may be included in both the intake system and the exhaust system of each cylinder.

Abstract: Wood pulp is bleached with chlorine dioxide gas. The gas is obtained by feeding a chlorine dioxide solution to a stripper. Shredded or fluffed pulp is exposed to a controlled amount of chlorine dioxide gas for a time period sufficient to obtain the required pulp brightness. The amount of unused chlorine dioxide gas is continuously monitored. The controlled amount of chlorine dioxide gas fed to the bleaching system is automatically adjusted by controlling the amount of chlorine dioxide solution fed to the stripper in response to changes in the amount of unused chlorine doxide gas leaving the bleaching system. Unreacted gases are recycled back to the stripper in response to the concentration of chlorine dioxide gas conducted from the stripper to the reaction area.

Abstract: The extruder screw has a solid feed section followed by a solid-melt transition section, followed by a melt metering section. A solid feed channel extends from the feed end of the extruder screw up to a point within the solid-melt transition section. A solid-melt channel extends longitudinally from the beginning to the end of the solid-melt transition section. A melt channel begins within the solid-melt transition section just after the end of the solid feed channel and extends longitudinally to the end of the melt metering section.

Abstract: A flow comprising solid particles in a fluid suspension under pressure, typically the rejects flow from a separator, is conducted to a vortex flow chamber. In the vortex flow chamber, added liquid flow is caused to whirl and the reject flow containing contaminants is squeezed towards the axis of the vortex flow chamber and accelerated axially. This prevents plugging of a flow control valve connected to the vortex flow chamber outlet.

Abstract: A laser beam is directed towards a workpiece immersed beneath the surface of a liquid coolant. An exothermically reactive gas is directed through the liquid coolant to the workpiece under sufficient pressure and velocity to sweep away a sufficient amount of the liquid coolant to expose part of the workpiece to the laser beam for cutting.