Abstract: An electromagnetic coil for use in a doorholder for retaining a door in an open position by magnetic interaction with an armature secured to the door includes a coil of wire for surrounding a core within a cup. A power control circuit including a resistor circuit, controls electrical power supplied to the coil, the power control circuit being mounted on a circuit board situated between the coil rear surface and the cup bottom. The resistor circuit being situated in sufficiently close proximity to the cup bottom for transfer of heat from the resistor circuit to the cup. The power control circuit also includes a low resistance circuit coupled to the resistor circuit, the low resistance circuit including a fusible link, the fusible link being selected to carry current when the power input terminals are coupled to a lower voltage power source and to stop carrying current when the power input terminals are coupled to a higher voltage power source.

Abstract: An electromagnetic doorholder for retaining a door in an open position by magnetic interaction with an armature secured to the door. The doorholder includes a core having a face confronting the armature and a coil of wire surrounding the core. A cup having an inside diameter somewhat greater than the coil outside diameter receives the coil, the core extending from the face to the cup bottom. A power control circuit including a resistor circuit controls electrical power supplied to the coil, the power control circuit being mounted on a circuit board situated between the coil rear surface and the cup bottom. The resistor circuit being situated in sufficiently close proximity to the cup bottom for transfer of heat from the resistor circuit to the cup.

Abstract: A quick die change capability is provided to a pellet mill by means of a fixture spider which can be attached to the pelleting die and to the rollers for a unitized roller/die cartridge. By employment of quick acting captive die clamps, as well as push-pull jacks, assembly and dismantling of the die/roller cartridge in the mill is simplified. Three axis adjustability of the fixture spider enhances ease of alignment.

Abstract: A method of controlling the application of power to a plurality of metering devices in a pesticide dispensing system permits operator controlled designation of row numbering, row-specific dispensing quantity of both seed and pesticide, and accurate records of starting and stopping times and locations. The method also permits operation of a large number of dispensing devices with a normal electrical system capacity by controlling the application or sequencing of power, the maximum power required by the system can be reduced at maximal speed and efficiency.

Abstract: A method for making a hydraulic door closer includes the steps of molding material to form an elongated single-piece housing having a longitudinal cylindrical bore extending from a first open end thereof to a closed second end, a transverse intersecting bore, and mounting feet; installing a spring within the cylindrical bore at the closed end of the housing; installing a piston within the cylindrical bore in contact with the spring, the piston having a toothed rack thereon and an opening in each end to permit passage of fluid therethrough; installing a pinion gear in the transverse intersecting bore in meshed engagement with the toothed rack; installing an endplug with a port in the first end of the longitudinal cylindrical bore; and inserting a valve device through the port, for controlling flow of fluid through the piston, and for thereby controlling closing speed of the door. The single-piece housing as well as other components may be molded from metal or polymeric materials.

Abstract: The limbs of the spring cage overlie portions of the cylindrical lock chassis. Accordingly, a graduated scale, with Arabic numerals aligned therewith, is inscribed on a portion of the chassis which one of the limbs overlies, and the flat, terminal end of the limb is used to indicate a proper door thickness adjustment. The cage is spring-biased away from the chassis, and retained on a projecting shaft by an adjusting nut threadedly engaged with the shaft. By threadedly moving the nut on the shaft, the cage is moved relative to the shaft and concomitantly, the limb terminal end is selectively aligned with a chosen one of the door thickness-indicating scale lines.

Abstract: A metering device for controlling the flow of granular material from a container. The metering device includes an electromechanical solenoid connected to a pivoting metering bar. When the solenoid is energized, the metering bar is pivoted away from an outlet aperture, permitting the flow of material from the container. When the solenoid is de-energized, a spring causes the metering bar to pivot into contact with the outlet aperture, closing the outlet aperture and stopping the flow of material from the container.

Abstract: A door lever assembly having a locked and an unlocked position includes a trim housing and a lever handle and cam rotatably connected to the trim housing. A rotatable shaft extends between the lever handle and the cam, with the shaft defining a connection groove therethrough to provide access to a shaft interior. The shaft interior is configured to accept a pin for connecting the cam and the shaft. This pin can be wedgably disconnected following controlled slippage of frictional wedge surfaces in response to excessive force applied to rotate the cam.

Abstract: Deflecting vanes, confronting the blades of the impeller-inducer, and fixed in the housing, inhibit the formation of a vortex upstream of the impeller-inducer. Too, the vanes direct the recirculation flow back into the central zone of the pump. The impeller-inducer is force-fed by its own recirculation.

Abstract: A door closer assembly provides a closing force to a door swingably mounted on a door jamb by a pair of arms pivotally attached to the door and the door frame. The door closer assembly has a housing and a spring for providing a closing force on the arm which closes the door when it is an open position. The improvement of the present invention includes a spring cushion device mounted on the housing of the door closer assembly for stopping the opening movement of the door as it reaches a predetermined angle of rotation. The cushion device provides a resilient counteracting force on the arm as the door reaches its predetermined angle of rotation which lessens the wear and tear exerted on the assembly by the opening force of the door.

Abstract: A door lever assembly having a locked and an unlocked position includes a trim housing and a lever handle rotatably connected to the trim housing. A cam is rotatably connected to the trim housing, and a pin mechanism is movably positionable to connect with the lever handle. A slider is attached for movement in the trim housing in response to rotation of the cam, anda lift arm is connected to the slider. The lift arm is rigidly movable with the slider when the door lever assembly is in its unlocked position and the lever handle is rotated. When the door lever assembly is in its locked position, the lift arm pivots toward the cam to disengage the pin mechanism from its connection between the lever handle and the cam.

Abstract: A fluid impeller for us in applications requiring superior cavitation erosion resistance. The impeller has a body fabricated from a castable metastable austenitic steel alloy which has a preferred chemical composition in the range of 17.5-18.5% chromium, 0.5-0.75% nickel, 0.45-55% silicon, 0.2-0.25% nitrogen, 15.5-16.0% manganese and 0.1%-0.12% carbon. Quantitative testing has shown cavitation resistance of four to six times that of standard boiler feed pump materials. A method for making cavitation resistant fluid impellers is also disclosed.

Abstract: A linear drive power door operator selectively and automatically opens and closes a door swingably mounted on a door jamb. The door operator includes a power screw disposed within a housing and a drive which powers the rotation of the power screw for moving a piston having a threaded bore threadably engaging the power screw linearly upon activation of the drive. A rack having teeth is engaged by the piston for moving the rack linearly from end-to-end. The power door operator further includes a pinion having teeth threadably engaging the teeth of the rack. The pinion is rotatable about a vertical axis upon the side-to-side linear movement of the rack. At least one link arm is pivotally connected at one of its ends to the pinion and pivotally connected at its other end to the door. A control device controls the operation of the drive for moving the door between a closed position and an open position.

Abstract: A door hold open device is disclosed for maintaining a door swingably mounted on a door jamb in an open position. The door hold open device includes an elongate track housing mounted on the door jamb, and a shaft disposed within the track housing. The shaft extends along a horizontal axis and is mounted for free rotation about the axis. A slider block having a threaded bore threadably engages a threaded portion of the shaft. The slider block is capable of moving linearly along the horizontal axis and causes the axial rotational movement of the shaft as it moves linearly from side-to-side. An arm link is pivotally connected at one of its ends to the slider block and pivotally connected at its other end to the door. The arrangement is such that upon manually opening and closing the door, the arm link moves the slider block linearly from side-to-side thereby causing the axial rotational movement of the shaft.

Abstract: A track driven power door operator selectively and automatically opens a door swingably mounted on a door frame. The power door operator includes an elongate track housing mounted on the door frame and a power screw disposed within the track housing. A drive is provided for powering the rotation of the power screw about the horizontal axis for moving a slider block linearly along the horizontal axis upon its activation. An arm link is pivotally connected at one of its ends to the slider block and pivotally connected at its other end to the door. A control is provided for controlling the operation of the motor for moving the slider block which rotates the door between its closed and open positions.

Abstract: A valve for regulating speed of operation of a door closer, includes an elongated hollow tubular body having a closed first end with driving provisions thereon, an open second end, and an orifice in its sidewall adjacent its closed first end; an endplug for a cylinder bore of the door closer, the endplug having an axial port in which the closed first end of the tubular body is rotatably supported and which provides a fluid tight seal about the outer surface of the tubular body; an annular valve seat adjacent the endplug, the seat being fixed against rotation, and having an open portion and a closed portion which provide varying degrees of occlusion of the orifice when the tubular body is rotated; and a seal plate check valve captured against a piston head and occluding an opening therein during closing, the plate also providing a seal about the outer surface of the tubular body near the open second end thereof.

Abstract: A regrind deflector for an apertured screen in a hammermill has a plate extending along substantially the entire length of the screen and having a straight surface smoothly blending to a curved surface, the straight surface beginning at an inner surface of the screen and substantially tangent thereto and extending outwardly to the curved surface which curves back inwardly to the inner surface of the screen and intersects therewith at an angle of less than 90 degrees. The number of deflectors required depends on hammermill size and operating conditions as well as characteristics of the feed material to be processed.

Abstract: A steam injection device for a vertical steam conditioning chamber for particulate material has one or more hollow modules having substantially conical tops and open bottoms arrayed along a support column extending from below the conditioning chamber to a point above the chamber. Steam for conditioning is supplied preferably through the support column in such a way that it uniformly permeates the particles along the height of the conditioning chamber as well as across its cross section. Additionally, by employing modules having other than symmetrically conical tops, it is possible to impart an irregular flow path to the particles being conditioned in the chamber. This permits uniform exposure of the particles to the steam in the conditioning chamber and, thus, promotes uniform conditioning.