Abstract: A precoalescer unit for a twin tower assembly for decontaminating compressed gas the towers of which each contain a desiccant and under timer control of individual solenoid valves alternately receive contaminated gas and individually cycle between decontaminating and regenerating cycles, the precoalescer unit being interposed in the path of flow of contaminated gas from a source to the towers' inlet ports and having a casing and a double-seated drain valve on the casing and connected for actuation to an actuating gas line of one of the towers, the casing containing an open-ended in-out tubular coalescer and a valve in and normally closing a lower end of the coalescer and opening under differential pressure on opening of the drain valve for enabling the precoalescer unit, in response to cycling of the towers, to be purged cyclically of coalesced oil drained by gravity from the outside and contaminants washed from the inside of the tubular coalescer by compressed gas received from the source.

Abstract: Method and apparatus for indicating on a pressure differential gauge whether air leakage in a compressed air line is within a predetermined acceptable level, the gauge has pressure-responsive and manually shiftable pointers and is connectable in the air line across a first restriction in the line for indicating by the pressure-responsive pointer pressure differentials across the first restriction, and a second restriction temporarily insertable in the line downstream of the first restriction for passing air at a rate equal to the permissible air leakage from the line, and discharging air through the second restriction and indicating by the manually shiftable pointer the position of the pressure-responsive pointer during such discharge, the manually shiftable pointer after removal of the temporary restriction indicating by the relative position of the pressure-responsive pointer on charging of the line whether leakage therefrom is within acceptable limits.

Abstract: Method of removing slimes from slime-containing slurries in which the slurry is force fed at an acute angle onto a downwardly directed screen surface of a welded profile wire screen having fine screen openings at a pressure which for the slime content and impact angle of the slurry on the screening surface will project water and suspended slimes from the slurry through and beyond the screen a distance sufficient to cause gravity discharge of the slime suspension free of contact with the back of the screen below the impact area.

Abstract: A screen basket for centrifugal deliquefying and/or classifying of particulate solid and solid-liquid mixtures, the basket being fed internally, rotating about a vertical axis and on initial installation presenting for driving engagement with the mixture fed into it an axially serrated internal screening surface formed by laterally inwardly and forwardly sloping bases of laterally spaced axially extending screen wires having as mixture-engaging serrations radially instanding leading edges.

Abstract: A twin tower assembly for decontaminating compressed gas, each tower having inlet, outlet, drain and solenoid valves of which the inlet and drain valves are separately connected directly to the solenoid valve and actuated respectively to close and open by actuating gas supplied and exhausted through the tower's solenoid valve, the towers by alternate energizing of their solenoid valves under timer control and actuation of their inlet and drain valves each normally alternating between decontaminating and regenerating cycles and together alternating in their decontaminating cycles for supplying a continuous output of decontaminated gas, the inlet and drain valves of each tower being so relatively constructed that actuating gas supplied at the same pressure at the solenoid valve exerts a greater force differential for closing the inlet valve than for opening the drain valve and ensures that in cycling the inlet valve will close before opening and open after closing of the drain valve.

Abstract: A hingeless ventilator having a frame attachable to a wall of a compartment about an opening therein, a closure member swingable against a side of the frame for opening and closing the opening, guide members fixed to and instanding from an opposite side of the frame beyond opposite ends of the wall opening, and arms fixed to the closure member adjacent opposite ends thereof and instanding therefrom through the wall opening and a screen plate integral with the frame and screening the opening, in which the arms mount on oppositely projecting stub axles a pair of rollers each riding on a guide surface of the adjoining guide member and having for engaging that surface an elastomeric collar, and compression of the collars of the pair of rollers against the guide surfaces provides through the arms of the closure member the tensile force for holding the closure member against and in any selected position relative to the frame when swung to that position by a handle connecting and reinforcing the end portions of the

Abstract: A reversible static screen for classifying and dewatering flowing slurries, the screen being inclined and having a flow or screening surface formed by laterally spaced screen wires disposed normal to the flow direction of the slurry and so spaced that the openings therebetween are narrower over the end portions than over the intermediate portion of the screen.

Abstract: Process for the recuperation of an insoluble salt of a metal from the rinsing solution of an electrodeposition of the metal.

Abstract: A process for decorating articles, such as jewelry, is disclosed in which the article is coated with two or more visibly different layers having binders soluble in a common solvent, each layer is dried before the next layer is applied and the final layer is applied wet with the solvent in sufficient concentration to at least soften the binder of any underlying layer. A pattern is made by applying pressure selectively to or otherwise redistributing the final and any at least softened underlying layer to expose one or more of the underlying layers. For example, a concentric wood ring effect is obtained by applying a greater pressure to the central portion of an article such as a ring coated with multiple layers of lacquer.

Abstract: A resistance welding machine for progressively welding each of a succession of transverse wires to longitudinal wires at a transverse welding station to and through which the longitudinal wires are incrementally advanced, the machine having a welding unit including a carriage mounted above the welding station for intermittent and reversible movement transversely of the machine and longitudinally of the welding station, a transformer vertically reciprocable in the carriage by a power unit mounted thereabove on the carriage, and a ram suspended from the transformer for movement in unison therewith and mounting for limited relative vertical movement a welding head carrying a front welding electrode, and a vertically movable guide bar and stationary platen, both electrically conductive and mounted independently of the welding unit, the guide bar below the ram and in advance of the welding station for guiding the longitudinal wires thereto and the platen underlying and supporting the longitudinal wires below both

Abstract: A solenoid-actuated drain valve for a compressed gas reservoir of a diesel locomotive in which the valve element is a differential piston exposed on opposite faces to reservoir pressure for normally holding the valve closed and minimizing the opening force required to be exerted by the solenoid, a temperature-responsive heating element protects the valve against freezing, a sensing element senses accumulations of water from the compressed gas in the reservoir, and actuation of the heater and energizing of the solenoid for opening the valve are both controlled by a solid state circuit which prevents opening of the valve except when the sensing element senses accumulated water.

Abstract: A canister-compactor assembly insertible as a unit in a housing of a compressed gas filter, the assembly including a canister loadable with a particulate desiccant and a pneumatic compactor mounted in an outlet end of the canister and chargeable with compressed gas for compacting the desiccant, the compactor being chargeable and dischargeable outside the filter housing and in the housing being exposed to filtered compressed gas for maintaining the desiccant compacted.

Abstract: A machine for welding screens formed of spaced longitudinal screen wires welded at a welding station to spaced transverse rods, in which the transverse rods in succession are clamped and welded to the screen wires at the welding station, the screen wires are incrementally fed to and through the welding station and in advance of the welding station are engageable by a spacer for predetermining the lateral spacing therebetween, a platen supports and backs the screen wires against forces exerted thereon by the spacer and in clamping a transverse rod thereto, and laterally spaced and tilted slots in confronting end surfaces of the spacer and platen slidably receive and guide the screen wires for enabling the screen wires to be correspondingly tilted longitudinally of the transverse rods when welded thereto.

Abstract: A canister assembly for containing a particulate desiccant in a housing of a compressed gas filter assembly having for the feed end of a canister a resiliently compressible closure formed of normally spring-spaced inner and outer parts connected for limited relative axial movement, the closure in operative position being contained and releasably locked in the canister with its inner part yieldably engaging an adjoining end of a charge of particulate desiccant.

Abstract: A three-way normally closed or open solenoid-actuated valve having the solenoid coil wound on a spool and therewith inserted uncoated through a side into a solenoid housing and in place encapsulated in an epoxy resin for protecting the coil and by wedging the spool against relative movement in the housing, enabling its cylindrical bore to act as a fixed guideway for receiving and guiding a reciprocable solenoid plunger. Upper and lower O-rings, the lower encapsulated with the spool and coil, seal against leakage of fluid from the solenoid housing.

Abstract: A machine for welding screens formed of spaced longitudinal screen wires welded at a welding station to spaced transverse tie rods, the machine having at the welding station a ram clamping both the screen wires and a tie rod against movement during welding and rearward of the welding station a transfer clamp assembly shiftable longitudinally of the screen wires for feeding the screen wires in predetermined increments to the welding station, the screen wires in a welding operation being clamped by both the ram and the transfer assembly against movement during welding and by one or the other against relative movement at other times.

Abstract: A system for mechanically or hydraulically driving or powering equipment in underground mines off an advance flight of a belt conveyor, in which an assembly of a spaced and drivably connected drive roller and pump and a common base is releasably mountable on wire ropes or other supporting members at opposite sides of the conveyor for selective positioning longitudinally of the conveyor beneath the conveyor belt's advance flight and is vertically adjustable relative to the advance flight for adjusting the driving engagement of the drive roller with that flight for either continuous or intermittent drive of the drive roller and pump while the belt is running.

Abstract: A compressed gas filter assembly having dual filter units each containing an adsorbent and alternating between filtering and regenerating cycles, the units alternately receiving compressed gas from a source for adsorbing a contaminant therefrom and having the adsorbent regenerated by reverse flow therethrough of filtered gas from the other unit and together providing an uninterrupted output of filtered gas from the assembly, and a regenerating line connecting filtered gas outlets of the units and having in each unit a restricted orifice centered on and directed toward a downstream end of a canister therein containing the adsorbent, each orifice alternately passing a metered flow of filtered gas under substantially constant pressure to the other unit and discharging filtered gas from the other unit as a substantially constant flow of gas at reduced pressure for regenerating and cooling the adsorbent in its unit.

Abstract: A self-cleaning screen for separating fibrous and other solids from flowing slurries, the screen having a flow surface formed by parallel laterally spaced screen wires disposed perpendicular to the flow direction of the slurry, each screen wire having a flat rearwardly declining top bounded forwardly by an arcuately convex leading edge and rearwardly by a sharp trailing edge and downwardly converging flat sides, the screen inducing a ripple motion in the slurry flowing across the screen wires and directing solids over and liquid downwardly between the wires.

Abstract: In a compressed gas filter unit including a housing and, for selective filtering, a particulate desiccant packed in a canister removably seatable from below in a central bore of the housing, a pneumatic compactor automatically charged in any filtering cycle of the filter unit and acting upwardly on the desiccant and therethrough on the canister for compacting the desiccant and pressing the canister fluid-tight against a seat therefor at the upper end of the bore.