Abstract: A reverse hydrocyclone cleaner for removing light contaminants from pulp slurry has a housing defining a hydrocyclone separating chamber. Pulp slurry is fed into the separating chamber adjacent an upper end thereof to form an outer helically and downwardly moving slurry stream relatively free from light contaminants, an inner pulp stream containing a substantial amount of the light contaminants and an air core within the inner stream. An overflow orifice is located adjacent an upper end of the separating chamber, and an underflow orifice is located adjacent a lower end of the separating chamber to remove the outer pulp stream relatively free from light contaminants. A centrally located blocking finger is located in the underflow orifice.

Abstract: A ground fault detector for an AC circuit is responsive to resistive ground fault current but not to capacitive ground fault current. Current in the AC circuit is sensed and a corresponding signal current is produced. The direction of the signal current is reversed in each alternate half AC cycle without reversing the signal current in each intervening half cycle, the unreversed and the reversed signal current is averaged, and the presence of averaged signal current above a predetermined value is sensed to indicate significant resistive ground fault current.

Abstract: An egg carton of synthetic plastic material has a bottom portion and a cover portion positionable on the top of the bottom portion to close the carton. The bottom portion has a plurality of compartments each dimensioned to contain the bottom portion of an egg in spaced relationship to an adjacent egg, and the cover is dimensioned to receive the top portion of an egg when the egg is located in one of the compartments and the carton is closed. The compartments are shaped to cause eggs positioned therein to tilt with their longitudinal axes inclined to the vertical by an angle in the range of from about 4 to about 6 degrees.

Abstract: Apparatus for transferring an electrically conductive liquid from a first container to a second container in which the liquid is maintained at a substantially different electrical potential from the electrical potential of the liquid in the first container without causing significant change in the electrical potential of the liquid in the first container. The apparatus has a liquid transfer chamber with an electrically insulating inner surface, a sprinkler for sprinkling liquid from the first container into an upper portion of the liquid transfer chamber to cause liquid droplets to fall from the upper portion to a lower portion of the chamber, and a second container connected to the lower portion of the liquid transfer chamber to receive liquid therefrom.

Abstract: A wall panel assembly has a pair of co-planar panels with adjacent spaced end edges. A first partial column member extends substantially the height of the panels on one side and also extends transversely across the space between the panels. The first column member has transversely extending flanges each secured to a respective panel on one side. A second partial column member extends for substantially the height of the panels on the opposite side and also extends transversely across the space between the panels. The second column member has transversely extending flanges each secured to a respective panel on the opposite side to form a hollow column with the first column member and the adjacent spaced end edges of the panels.

Abstract: A fluid foil for use in a marine propeller having an upper surface with a uniform, continuous convex shape commencing at the leading edge and terminating at the trailing edge of the foil section and a lower foil face having a convex shape extending from the said leading edge to the foil mid/chord position and having a concave shape extending from the said mid-chord position to the said trailing edge. An effective pitch line extending from the foil leading edge to the foil trailing edge is intersected tangentially by the concave shape of the lower foil face.

Abstract: A coupling for connecting a vehicle exhaust pipe to an exhaust conduit for removing vehicle exhaust gases has a cylindrical housing with an inlet at the front end and an outlet at the rear end, the rear end being connectible to an exhaust conduit. A bristle assembly is mounted within the housing adjacent the front end. The bristle assembly includes an annular container and a multitude of resilient bristles extending radially inwardly from the retainer towards the longitudinal axis of the housing and terminating at a position spaced from the longitudinal axis to provide a central aperture. The bristles project radially inwardly from the retainer by a distance in the range from about 4:1 to about 8:1 longer than the radial thickness of the retainer to enable the front end of the housing to be pushed over a vehicle exhaust tail pipe to cause the tail pipe to bend the bristles rearwardly into engagement with the tail pipe to produce an effective gas seal between the front end of the coupling and the tail pipe.

Abstract: A ski attachment for pivotal attachment to the axle or transverse rod-like member of a wheeled vehicle which comprises at least one ski having an elongated runner with an upturned front tip, an upstanding pedestal mounting on said elongated runner behind said front tip, said pedestal having an upper distal end with a transverse recess or like means formed therein for pivotally receiving said transverse axle or rod-like member of the vehicle, said pedestal and ski having a total height greater than the radius of the vehicle wheel, and tension biasing means interconnecting the front tip of the ski to the vehicle above the axle for urging the front end of the ski upwardly relative to the vehicle whereby the mounting of obstacles during forward travel of the vehicle is facilitated. In a preferred aspect, the ski attachment of the invention comprises a pair of skis, with means for securing the skis together in spaced side-by-side relationship.

Abstract: A telescopic pole system for supporting a bird feeder, light system or the like comprises an elongated lower tubular pole component of circular cross-section, a ground sleeve for supporting the lower pole component, an upper tubular pole component of circular cross-section having an inner diameter greater than the outer diameter of the lower pole component, the lower pole component having an upper end of expanded cross-section for a snug, sliding fit within the upper pole component, and a collar secured to the lower end of the upper pole component having centering members for providing a snug, sliding fit over the lower pole component as the upper component is axially extended and retracted relative to the lower component, the collar having a pivotally-mounted retainer for locking the upper component on the lower component.

Abstract: A portable door lock is provided for a door having a latch engageable in an aperture in a latch plate secured to a door frame, the latch plate having a tongue extending into the aperture from a front edge of the latch plate, and the tongue being spaced from the top and bottom of the aperture. The door lock includes a retainer positionable against the latch plate to permit closing of the door and having a pair of vertically spaced fingers insertable into the latch plate aperture to engage the front edge thereof above and below the latch plate tongue. A retainer shaft extends forwardly from the retainer and has a screw-thread portion, and a holding bracket has a medial portion slidably mounted on the shaft and rearwardly projecting holding arms at opposite ends.

Abstract: A screen printing frame assembly has a rectangular main frame with laterally spaced side members, longitudinally spaced end members, and a pair of longitudinally spaced cross members extending between the side members. At least one rectangular sub-frame has laterally spaced side portions, longitudinally spaced end portions and a screen printing medium extending across the sub-frame, the screen printing medium bearing a single numeral to be printed. Each cross member has a sub-frame retaining portion engageable with a respective end portion of the sub-frame to retain the sub-frame in assembly therewith.

Abstract: Modular stage platform comprises a pair of parallel, spaced-apart base members each comprising an elongated extrusion having an upstanding wall defining a continuous toe plate and an inwardly facing channel at the bottom thereof, the channels of the pair of spaced apart base members being opposed to each other, a plurality of equispaced transverse tubular members having opposite ends inserted into said opposed channels and secured thereto along said base members, a pair of parallel, spaced-apart midrails, each comprising an elongated U-shaped extrusion having a pair of walls depending downwardly from a web, said walls having opposed ridges formed on their inner sides spaced from the distal ends thereof and spaced from the web to form a continuous, downwardly-facing recess along the length of each rail and an inner box-like cavity, a plurality of equispaced vertical tubular members having their upper ends inserted into said recess and their lower ends abutting the base member channel rigidly secured thereto in

Abstract: A process for producing an Sm.sub.2 Co.sub.17 alloy suitable for use as a permanent magnet, the alloy also containing iron, copper and zirconium or a similar group IVB or VB transition metal, and optionally praseodymium in partial replacement of the samarium.

Abstract: Method and apparatus for the agitation of base metal on alloy melts, and for the agitation and alloying of base metal melts with at least one alloying metal. A rotatable device is suspended in a melt of base metal and the device is rotated to draw at least a partial vortex in the melt. The device comprises a hollow cylinder having an open top and a closed bottom. An array of openings in the cylinder side wall is adapted to allow melt of the base metal to pass through. In the agitation of a base metal or alloy melt, the amount of dross formed on the melt is reduced. In alloying, the at least one alloying metal may be added directly to the melt or may be added in particulate form into the vortex in the device, the latter being particularly useful when the melting point of the alloying metal is higher than that of the base metal or alloy.