Abstract: A hydrodynamic device for generating negative pressure excursions in a pulp slurry during fine screening, includes a plurality of half-foil members disposed on a substantially cylindrical outer surface of a rotor. The rotor is mounted within and co-axial with a substantially cylindrical screen having a circumferentially continuous apertured zone to define an annular screening chamber between the rotor and the screen. The half-foil members are collectively at least axially co-extensive with the apertured zone and have a leading edge which, also collectively, is inclined at a spiral angle relative to the axis of the rotor such that during rotation, the collective leading edge of the half-foil members conduct large particles downwardly through the screening chamber. A selection of hydrodynamic foil configurations is provided in order to adapt to a wide range of pulp types and screening conditions.

Abstract: A door latch operating assembly is capable of rotating a door latch arm between a first locked position for locking a door in a closed position and a second unlocked position for unlocking the door. The latch operating assembly includes a lock platform and a handle having a gripper portion which is grasped by a person's hand for rotating the handle, and a shaft portion attached to the gripper portion and extending therefrom through an opening in the lock platform. A driver cam has a housing which receives the shaft portion of the handle, and at least one wing member extending laterally outwardly from one side of the housing. The wing member has an upwardly facing engaging surface for engaging a link which is linearly movable with respect to the lock platform. The link has a bottom edge portion with a downwardly facing engaging surface which bears against the upwardly facing engaging surface of the wing member of the driver cam, and a top edge portion with an upwardly facing engaging surface.

Abstract: A power actuated door operator for opening and closing a door has a power inlet into a cylindrical body containing a power piston, a hydraulic door closer piston with a rack gear for engaging with a pinion gear for operating a door control arm, a head separating the power piston in a chamber from the hydraulic door closer piston in a hydraulic chamber, a reciprocable rod extending through an opening in the head for transmitting pushing forces between the power piston and hydraulic door closer piston, and a spring for pushing the hydraulic piston to provide closing force to the door control arm after the door has been opened by the door operator, and further has the improvement providing capability for enabling the reciprocable rod to move radially with respect to faces of the power piston and the hydraulic closer piston to accommodate misalignments between the pistons, the rod, and the opening in the head.

Abstract: A pellet mill for pelleting feed product, has a pelleting die with a plurality of extrusion holes for extruding the feed product; rollers, rotatable relative to the pelleting die, for forcing feed product through the extrusion holes; provision for intensively mixing and shearing the feed product before introducing the feed product to the pelleting die; and a device for positively conveying the feed product into the provision for intensively mixing and shearing.

Abstract: A door lever assembly for disengaging an unlocked latch of a lockable door latch assembly includes a lever handle rotatably connected to a trim housing and a cam operably connected to the lever handle. The cam is positioned to rotate in response to rotation of the lever handle, converting its rotational movement to linear movement of a movable slider positioned adjacent to the cam. An electrically activated block arm is positionable to prevent movement of the movable slider, effectively locking the door lever assembly.

Abstract: A door handle mounting assembly capable of being mounted on a door includes a lock platform having an opening formed therein and a handle mounted on the lock platform without the need of mechanical fasteners, staking or welding. More specifically, the handle has a gripper portion which is grasped by a person's hand for turning the handle, and a shaft portion which is attached at one of its ends to the gripper portion. The shaft portion extends through the opening of the lock platform and has a circumferential groove formed therein. A retaining collar having an annular wall is positioned to engage the lock platform, the collar having an inwardly projecting annular ring connected to the annular wall. The assembly also includes a driver cam having a housing with a hollow boss extending through the opening of the lock platform along a longitudinal axis.

Abstract: A mullion assembly mountable in a door frame includes a bottom fitting attached to a floor and a top fitting attached to the door frame above the bottom fitting. The top fitting supports a latch engagement assembly for engaging a latch assembly positioned in a mullion cavity of a mullion. The latch assembly has a latch extendable from the mullion cavity to engage the latch engagement assembly supported by the top fitting and hold the mullion in a fixed position. Retraction of the latch is controlled by a key lock assembly connected to the latch assembly through an actuating link assembly. The key lock assembly permits key controlled disengagement of the latch from the latch engagement assembly, followed by temporary removal of the mullion from its position in the door frame.

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 the vertical centerline of the chamber, each supported by at least one hollow leg attached to the chamber wall. Steam for conditioning is supplied to the modules through the support legs by means of a manifold which distributes steam to steam ports in the chamber wall. 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.

Abstract: An anti rewet deck is provided for press rolls used to increase consistency of fibrous pulp slurry from approximately 4 percent up to about 30 to 50 percent. This is accomplished by biasing the location of the drainage holes in the roll shell to the forward edge of the drainage compartments within the roll shell. To avoid the necessity for handing of the rolls, a mechanism is provided for accomplishing the purposes of minimizing rewet at practical production rates by providing baffle plates which effectively orient the draining pattern in the desired direction. Such baffles can be permanently or removably installed once the desired handing of the rolls is determined.

Abstract: A latch assembly for a fire door having a pushpad for emergency exit is described. The pushpad is connected to a rod to transfer motion of the pushpad to the latch assembly. The latch assembly includes a platform attached to the fire door, a linkage assembly attached between the rod and a latch bolt, and a deadlock arm assembly attached to the platform. The deadlock arm assembly is movable between a first position to block movement of the linkage assembly and a second position to allow movement of the linkage assembly. A fire fuse assembly is also attached to the linkage assembly to move the deadlock arm assembly out of its first position blocking movement of the linkage assembly at normal room temperature.

Abstract: A horizontal cylindrical sifter is provided, including a housing with an inlet for feed material of mixed size at a first end, an outlet for coarse material at a second end, a cylindrical screen for sifting the mixed feed material to separate the coarse material from fine material mixed therewith, the screen extending from the inlet to the outlet of the housing and having a rotatably driven shaft extending along an axial centerline of the cylindrical screen, agitator arms extending substantially radially outwardly from the rotatably driven shaft and having mounted at outer radial extremities of the arms agitator blades for rabbling the mixed feed material on the screen, and the improvement, in combination with the sifter, which provides for adjusting the agitator arms to alter an angular orientation of the agitator blades.

Abstract: A chamber having a slurry-admitting inlet at one end has a metering opening lengthwise thereof for feeding slurry to an associated slurry processing machine. A rotatable bar, having a plurality of spaced apart grooves formed therein, is disposed in immediate proximity to the metering opening to control slurry-flow through the opening. The grooves insure that access to the opening, by the slurry, will be greater than the largest floc diameter of the pulp at all operating conditions.

Abstract: A multistage centrifugal pump having a last stage diffuser which acts as a compensator to load the suction and intermediate pressure gaskets during pump operation and pump stand-by. The last stage diffuser is designed as a spring which deflects under varying conditions and imparts a spring force on the channel rings during assembly, stand-by and other operating conditions.

Abstract: An overhead mounted door holder assembly for attachment between a door jamb and a door, to hold the door in an open position, includes a jamb bracket attached to the door jamb and a jamb arm pivotally attached to the jamb bracket. A channel assembly having a longitudinally extending channel is attached to the door, and first and second end caps are attachable to opposing ends of the channel assembly, with each end cap being held by a retaining key in locked connection with the channel assembly. The first and second end caps are configured to allow alternate positioning of the channel assembly inset in a top of the door or attached to a side of the door. A hold open stop is fixably held in the channel of the channel assembly. The hold open stop is configured to have a stop element for engaging a slide assembly pivotally attached to the jamb arm and positioned for longitudinal movement in the channel.

Abstract: A mullion assembly mountable between a floor and a door frame includes an engagement assembly attached to either the floor or the door frame. A mullion defining a mullion cavity is positioned in removable attachment with the engagement assembly, and a cylinder lock assembly is positioned in the mullion cavity. The cylinder lock assembly has a key lock cylinder configured for positioning in either a locked position to engage the engagement assembly and hold the mullion in an upright position in the door frame, or in an unlocked position disengaged from the engagement assembly to permit removal of the mullion from the doorway.

Abstract: An overhead mounted door holder assembly, for attachment between a door jamb and a door, to hold the door in an open position includes a jamb bracket attached to the door jamb and a jamb arm pivotally attached to the jamb bracket. A channel assembly having a longitudinally extending channel is attached to the door. A slide assembly is disposed within the channel and is pivotably connected to the jamb arm. A slide catch on the slide assembly is provided for the door holding function. First and second springs are attached to the channel assembly and positioned within the channel, and a spring mounted catch is attached to the first and second springs. In operation, the spring mounted catch is pivotably positioned in the channel to engage the slide catch and reversibly hold the door in an open position.

Abstract: An adjustable overhead mounted door holder assembly for attachment between a door jamb and a door to hold the door in an open position includes a jamb bracket attached to the door jamb and a jamb arm pivotally attached to the jamb bracket. A channel assembly having a longitudinally extending channel is attached to the door, and a spring assisted assembly holds the door in an open position assisted by frictional force. The amount of friction is adjustable by altering a rotational position of an eccentric cam.

Abstract: A door holder assembly, for attachment between a door jamb and a door, to hold the door in an open position includes a jamb bracket attached to the door jamb and a jamb arm pivotally attached to the jamb bracket. A channel assembly having a longitudinally extending channel is attached to the door, and a hold open stop is fixed in the channel of the channel assembly. The hold open stop is configured to have a stop element with a first ramp and a second ramp engageable by a slide assembly. The slide assembly is pivotally attached to the jamb arm and positioned for longitudinal movement in the channel, with the slide assembly having a slide frame configured to support a rocker pivotably connected to the slide frame. The rocker has a catch on one side of a pivot and rocker face on the opposite side of the pivot, with the catch configured to slide over the first ramp for reversible engagement with the second ramp of the stop element to hold the door in an open position.

Abstract: A door lever assembly for disengaging an unlocked latch of a lockable door latch assembly includes a lever handle rotatably connected to a trim housing and a cam operably connected to the lever handle. The cam is positioned to rotate in response to rotation of the lever handle, converting its rotational movement to linear movement of a movable slider positioned adjacent to the cam. A lift arm is operably connected to vertical rods of the door latch assembly and an over-ride spring is connected between the slider and the lift arm. The over-ride spring transmits motion of the slider to the lift arm to lift the lift arm and the connected vertical rods when the door latch assembly is in an unlocked position. The over-ride spring compresses in response to slider movement when the blocking slide is positioned to block movement of the lift arm when the door latch assembly is in its locked position, preventing damage to components of the door lever assembly.

Abstract: A mullion assembly mountable in a door frame includes a bottom fitting attached to a floor and a top fitting attached to the door frame above the bottom fitting. The top fitting supports a bolt engagement assembly for engaging a lock assembly positioned in a mullion cavity of a mullion. The lock assembly has a bolt extendable from the mullion cavity to engage the bolt engagement assembly supported by the top fitting and hold the mullion in a fixed position. Retraction of the bolt is controlled by a key lock assembly that allows controlled access disengagement of the bolt from the bolt engagement assembly, followed by pivoting movement of the mullion away from its upright position in the door frame.