Abstract: A self-contained dust collector which includes a quick release adaptor duct mounted between a filter unit and a storage receptacle for conveying dust to the receptacle with the quick release adaptor duct comprising a planar member having a central opening and a plurality of pleats which permit the outer periphery of the planar member to either be (1) lengthened as the planar member is moved from a closed duct forming position in which the duct provides a sealed transition duct for conveying dust into the receptacle to an open nonduct forming position spaced away from the receptacle or (2) shortened as the planar member is moved from the open nonduct forming position into the closed duct forming position in which the outer periphery of the planar member is placed under tension to maintain the periphery in sealed relation to the receptacle.

Abstract: A grinding mill apparatus is disclosed comprising a grinding mill having a feed end head and a discharge end head and a shell disposed between said heads and secured thereto for rotation with the head. A feed end bearing and a discharge end bearing are provided for supporting the feed end head and the discharge end head for rotation about a generally horizontal axis. The bearings include a bearing element which pivots with the heads with the amount of pivot proportional to the increase or decrease of charge level within the mill. A proximity probe is secured to a stationary surface and aligned with a target which is secured to the bearing. The proximity probe detects changes in gap size between the probe and the target and generates a signal indicating an increase in charge level or a decrease in charge level within the mill.

Abstract: An apparatus for controlling a hydraulic turbine is disclosed comprising a hydraulic circuit to control the positioning of turbine runner blades and a hydraulic circuit to control the positioning of turbine wicket gates. The runner blade hydraulic circuit comprises a solenoid valve for normal operation of the blades and a slow rate servovalve for moving the blades when the actual blade position differs from a desired position by less than a predetermined tolerance. The wicket gate circuit comprises a solenoid valve for normal control of the gates. A diverter directs flow from the solenoid valve to a flow rate control valve when the difference between the actual and desired position of the gates is less than a second predetermined tolerance.

Abstract: A hydraulic manifold is provided on a primary mast section which maximizes the commonalty of hydraulic components used in the hydraulic lift control systems of two and three stage mast assemblies used in lift trucks. Two and three stage mast assemblies are illustrated using primary mast sections which are identical and using secondary mast sections which are nearly the same.

Abstract: An adjustable draft tube is disclosed for a hydraulic turbine installation. The draft tube includes a pair of fabricated box piers which are positioned in a tailwater with the turbine outlet disposed between the piers. The piers are anchored to a tailwater floor and a powerhouse foundation wall. A roof is provided extending between opposing surfaces of the piers with an edge of the roof pivotally secured to the piers above the turbine outlet. The roof is pivotable between a first position with a downstream edge of the roof disposed beneath a predetermined low tailwater elevation and a second position with the downstream edge disposed between the low tailwater elevation and a predetermined high tailwater elevation.

Abstract: This invention relates to a vehicle-mounted closed circuit portable crushing and screening plant in which a plurality of units for processing material to be crushed, such as a grizzly, a primary crusher, and a secondary crusher are mounted to discharge their outputs onto the horizontal feeder portion of a dual belt conveyor-elevator having an elevator portion which receives the deposited material from the horizontal feeder portion and elevates such material to and discharges such material into the upper feed end of a vibrating screen device mounted on the vehicle. The vibrating screen device classifies the material deposited thereon for recirculation to the secondary crusher and/or for discharge as a plurality of end products of predetermined size classifications. The vibrating screen device and the dual belt conveyor-elevator are both foldable from an elevated operating position to a retracted transport or storage position.

Abstract: A suspension system for mounting filter bags in a baghouse is disclosed featuring a pretensioned spring having an amount of pretension which will prevent spring displacement when subjected to a first loading force which is the combined weight of the filter bag and a predetermined dust load therein but will permit momentary spring displacement when it is subjected to a second loading force which is the sum of the first loading force and an additional loading force imposed on the filter bag during a cleaning cycle.

Abstract: The carriage lift and mast lift cylinders are sequentially extended and retracted in the reverse order of pressure required to actuate them by a sequencing valve to insure proper sequential movement of the lift carriage and extension of the mast sections.

Abstract: An overhead guard is provided for counterweighted lift trucks of different lengths. The overhead guard has a top portion supported at its front end by a pair of laterally spaced front legs extending downwardly to attaching points on the front of the truck and the top portion is supported at its rear end by adjustably positioned laterally spaced rear posts. The top of the rear posts may be attached to different longitudinally spaced points on the upper portion of the guard and the bottom of the rear posts are attachable to support posts on the counterweight which is at different longitudinal positions on different length trucks.

Abstract: A pump is disclosed having a damped dynamic vibration absorber for attenuating pump vibration in response to a periodic disturbing force generated when the pump is in operation. The vibration absorber comprises elastic means, an annular mass and an energy dissipative means. The elastic means are arranged around the pump in a plane generally normal to the axis of rotation having one end secured to the pump and one end free to vibrate relative to the pump. The annular mass is secured to the free end and the energy dissipative means comprising a squeeze film damper is secured to the annular mass. The annular mass has a predetermined mass, and the elastic means have a predetermined stiffness and the squeeze film damper has a predetermined damping ratio such that the absorber generates a compensating force acting on the pump out of phase with a periodic disturbing force which acts on the pump and is generated while the pump is operated.

Abstract: A self-cleaning collecting device for cleaning a dirty gas stream including a flow-through housing having a dirty gas inlet at the base of the housing and a clean gas outlet at the top of the housing interconnected by a gas treating passage adapted to direct a gas stream vertically through the housing. As the dirty gas stream enters the housing, it is circulated through a liquid bath where noxious vapors and larger particulates are entrained in a mist of liquid droplets which are in turn captured and removed from the gas stream as it moves through a separating panel positioned above the liquid bath. As the gas flows upwardly out of the panel, the captured liquid is circulated to the liquid bath to maintain a flow of liquid within the panel which acts to continuously wash the particulates from the panel.

Abstract: A hydraulic turbine installation is disclosed for a site comprising a dam having a floor and opposing sidewalls defining a spillway. The installation comprises a frame member which slideably engages the spillway floor on a downstream side of the dam. The frame member is slideable transverse to a direction of water flow through the spillway. A hydraulic turbine and connected generator are carried by the frame member. The frame member is provided with an intake such that when the frame member is in a first position within the spillway, water flow through the spillway is directed through the turbine runner. The frame member is slideable to a second position with the frame member out of the spillway and water flow through the spillway uninterrupted. Power actuated means such as hydraulic servomotors are provided for sliding the frame member between the first and second positions.

Abstract: A warehouse system employs a crane guided for movement along an aisle with storage racks on opposite sides thereof and mounting a carriage for vertical reciprocation thereon. An extractor supported on the carriage has a pair of narrow extensible arms which engage the undersides of lips formed on opposite sides of a tote pan. The extensible arms each include three rails nested in one-above-the-other relation with the intermediate rail having vertical load bearing rollers engaging the upper and lower rails. A harmonic drive causes extension and retraction of the extractor arms through a chain and pulley arrangement. The tote pans are nestable and have ribbed bottoms cooperatively engaging cantilevered brackets on the storage racks whereby the pans are releasably detained in their stored position in the warehouse.

Abstract: A method for manufacturing stay rings for a family of hydraulic turbine installations is disclosed. The stay ring comprises a plurality of stay vanes axially extending between two concentric ring members. Stay vanes are formed from flat plates and aligned circumferentially on the rings with radially outer leading edges presenting an intake angle acceptable for any turbine installation within a predetermined family of turbine installations. The vanes are sized such that their length measured from the leading edge to a trailing edge is such that the vane presents a discharge angle equal to a predetermined minimum discharge angle for the family of turbine installations for a given turbine installation. A desired discharge angle corresponding with a desired power output is predetermined and the trailing edges of the stay vanes are trimmed an amount sufficient for the stay vanes to present the desired discharge angle.

Abstract: A dust collector forming vertically oriented filtering panels with downward flow of dirty gases and a quiet zone below the panels for trapping particulates of dust that have been separated from the gases and passed into the quiet zone.

Abstract: A weather louver for separating particles from a gaseous medium and primarily to separate mist and droplets of moisture from an air stream. This device includes parallel passages with moisture traps and collectors having drainage troughs to separate the moisture from the air.

Abstract: An invertible corner connecting clip is disclosed having an out-corner unit and an in-corner unit connected together in spaced parallel right angle relation to define pockets for receiving side walls of main and cross support members of a ceiling latticework. The out-corner unit has upper and lower horizontally extending relieved areas to enable the clip to be inverted and used to complete either a right or left-hand corner and a tactile indicator to identify proper orientation of the clip for installation.

Abstract: A hose tensioning device is provided to suitably tension a flexible hydraulic hose used on a lift truck so as to reduce damage that might otherwise occur should the hose become slack. The hose tensioning device serves as a hydraulic connector and its outer component is a protective housing for the biasing spring by which the hose is tensioned.

Abstract: An air volume control ventilation system which minimizes variation in air volume flowing through the system has a fan for drawing air through fixed-resistance filter means including a roll filter, an electrostatic filter, and a high efficiency filter; a variable-resistance volume control damper operated, when an actuator therefor is energized in opposite directions, to open and to close and thus vary the volume of air flowing through the system; and a differential static pressure switch connected across the fan and being provided with a normally open high limit set of contacts adapted to close and complete a circuit to open the damper when the differential pressure across the switch rises to a first predetermined limit and also a low limit set of normally open contacts adapted to close and complete a circuit to shut the damper when the differential pressure falls below a second predetermined limit, whereby the damper is alternately open and shut and the differential pressure across the fan is maintained withi

Abstract: A filter supporting and sealing arrangement including a filter support grid having support beams with each beam defining parallel channels carrying a fluid sealant. The grid defines filter openings receiving filters with peripheral flanges on each filter forming a knife edge received in the fluid sealant of the channels for sealing the filter when it is in the normal operating position.