Abstract: A water toy for children comprises a plurality of puzzle pieces formed of lightweight, floatable material and each puzzle piece includes one or more contoured edge portions which are shaped to removably interlock with a contoured edge portion of an adjacent puzzle piece like a jigsaw puzzle. The assembled puzzle pieces form the outer profile of an animal or other creature such as a whale, or the like, when they are assembled together with their contoured edge portions interlocked in a proper selected assembled relation. Each puzzle piece is of sufficient thickness so that while the pieces may slide relative to one another due to the water action, they will not become disassembled. Each of the individual puzzle pieces also includes on at least one side, an individual animated face and is shaped to present a particular real or imaginary animal such as a turtle, shark, seal, serpent or other creature.

Abstract: An improved bird feeder is disclosed herein of the type having a hollow housing for holding a main supply of bird feed with a plurality of feeding apertures located at different heights thereon. This improved bird feeder has means for retaining a supply of bird feed at the vertically staggered feeding apertures which are independent of the level of main supply in the housing. Because of this, bird feed is provided at a feeding aperture even after the main supply has dropped below that feeding aperture.

Abstract: A corn shelling device is disclosed comprising a support structure, a plurality of rollers rotatably mounted within the support structure and having an abrasive outer surface for shearing off the kernels, and power means for rotating each individual roller at a different speed. The rollers are generally cylindrical in shape and disposed at an acute angle with the vertical axis of the support structure so that an ear of corn will be received among the rollers in contact with each roller at one point. An alternate embodiment further skews the rollers at an acute angle to increase the feed of the cob and the shelling speed. A guide directs the corn into position relative to the rollers.

Abstract: A live poultry-conveying, counting and crating device is described which comprises(a) a chicken house;(b) a counting station;(c) live poultry-conveying mechanism for conveying live poultry inside and out of the chicken house through the counting station;(d) a loading chute having a bottom downwardly inclined at an acute angle on which the live fowl can slide downwardly, an inlet opening at the upper end of the latter for receiving live poultry from the live poultry-conveying mechanism, and an outlet opening at the lower end of the inclined bottom; wherein the counting station is associated with the chute for counting live poultry passing down the latter; and(e) a transport mechanism for transporting empty coops having an aperture in their top face to the outlet opening of the chute and coops filled with live poultry away from the outlet opening of the chute;the transport mechanism comprises an arrester plate for stopping each coop as it arrives at the outlet opening for a time sufficient to fill the coop with

Abstract: A device for teaching dental students and technicians how to adjust and position an X-ray cone relative to the upper or lower jaw of a patient to achieve a proper angle and maximum clarity for the particular purpose for which the X-ray picture is being taken which includes a simulated jaw or human head bearing teeth and a simulated X-ray cone together with miniaturized X-ray film images or projection slides of X-ray films, to be positioned and illuminated on demand, each picture appearing in response to a student selected particular position of the simulated cone relative to the jaw to show whether the cone is properly positioned. These X-ray pictures are made of a human skull. The simulated patient is a plastic reproduction of the original skull.

Abstract: An extremely dependable, rugged display apparatus is provided for continuously displaying a portion of an endless tape, web, or belt containing visual messages or markings thereon. The endless tape, web, or belt moves from a storage space at the back of the apparatus, where excess slack in the tape, web, or belt is stored in loose folds, to and beneath a floating idler roller at the bottom of the apparatus. The tape, web, or belt then moves between a flat plate and a transparent sheet at the front of the apparatus to a drive roller at the top of the apparatus. The transparent sheet forms at least a portion of the front panel of the apparatus, and the flat plate is positioned flatwise directly behind and spaced from the transparent sheet. The tape, web, or belt passes between the drive roller and a free rolling, nip roller which is supported by the drive roller, and, then, back to the storage space.

Abstract: A vehicle having four LDRs (light dependent resistors) on the upper surface thereof has a first motor for driving the vehicle in a forward or reverse direction and a second motor for turning the vehicle in a rightward or leftward direction. Selective light illumination on LDRs causes the vehicle to be propelled in a forward or reverse direction or to turn in a right or left direction. A selected LDR pair may be illuminated simultaneously to cause the vehicle to move forwardly and rightwardly; to move forwardly and leftwardly; to move rearwardly and rightwardly; and to move rearwardly and leftwardly. The LDRs may all be sensitive to the same radiation frequency range or may be responsive only to radiation frequencies in mutually exclusive ranges. A manually operated radiation frequency generator is used to illuminate the LDRs and control the car direction movement. The generator may have a single band of frequency ranges or may have specific limited and mutually exclusive radiation frequency bands.

Abstract: A combined hat and throwable amusement device is disclosed wherein the hat when immersed in water obtains an aerodynamic stability whereby the hat may be sailed through the air as a saucer-like amusement device. The combined hat and throwable amusement device comprises a hat crown having an inverted bowl shape with a top region and a lower terminating edge. A substantially symmetrical hat brim extends from the terminating edge of the hat crown. The improvement comprises a plurality of slot apertures uniformly located about the hat crown with each of the slot apertures extending partially between the top region and the lower terminating edge of the hat crown. The plurality of slot apertures enable air currents to flow through the slot apertures to increase the aerodynamic stability of the device when the device is sailed through the air. The device includes a bouyant hat band to provide flotation to the device upon immersion in water.

Abstract: A dental articulator comprises a pair of opposed tray mounting arms pivotally connected together and removably securing thereto dental model mounting trays, an abutment on one end of each arm engaging surfaces formed in the tray to prevent lateral and vertical movement of one end of the tray, a key on the tray engaging a keyway in the arm to prevent lateral movement of the other end of the tray and a releasable clamp engaging an angular surface of the tray other end to prevent vertical tray movement. A dental model is adhesively secured to a mounting surface of the tray.

Abstract: A portable, or travel-type, oral hygiene appliance is provided with simplified and effective means for producing a pulsating, or intermittent, liquid jet; and optionally including a light stick for obtaining locally-concentrated illumination of areas within the mouth. The appliance is of lightweight and compact construction, in the form of an appliance casing having reduced vertical thickness and with a foldable water container carried on a portion of the upper surface of the casing. The pump for propelling a pulsating liquid jet uses a rotating member carrying spaced roller elements that move against a resilient, flexible, hose with a water column therein, to compress the hose between each roller and an abutment, thereby applying impeller force to spaced segments of the liquid column, so as to obtain an intermittent high pressure, liquid jet, discharge.

Abstract: A mowing machine adapted to be connected to a three-point lifting device of a tractor and powered by a power take-off therefrom, the mowing machine extending laterally to the side of the tractor and having two mowing assemblies, each of which includes a rotor which is powered by a gear chain and belts from the power take-off and is mounted by bearings to rotate about a substantially vertical axis which also contains a stationary shaft having the same longitudinal axis as the axis of rotation of the rotor. The vertical stationary shaft has a non-rotatable ring gear at its lower aspect which is surrounded by the rotor which, by a cover plate on its underside supports spur gears which mesh with the ring gear and also cutting elements, the arrangement being that the cutting elements rotate much faster than the rotor and are caused to rotate by the meshing of their individual spur gears with the ring gear.

Abstract: The invention provides a dental amalgamator which prevents mercury vapor, given off during amalgamation, from polluting the air in the neighborhood of the amalgamator. The amalgamator comprises a casing carrying a capsule holder and a drive means for the holder, a lid movable to a closed position in which it cooperates with the casing to form an enclosure for a capsule held by the holder, the enclosure having air inlets allowing air to flow from the atmosphere into the enclosure. A vacuum pump is arranged to communicate with the enclosure via a mercury filter medium, so that during amalgamation air is drawn into the enclosure, over the capsule, and then through the mercury filter where mercury vapors are removed.

Abstract: An illuminable sign which includes a panel having an opening therein. A lens assembly, which includes at least one magnetic member on its outer periphery, is mountable in the opening from the front side of the panel. The lens assembly is removably secured in the opening via one or more permanent magnets mounted adjacent to the opening on the back side of the panel, which attract the magnetic member, or members.

Abstract: Disclosed herein is an apparatus for training horses. The apparatus contains an induction coil powered by batteries. It may be activated manually, remotely, or automatically by means of an inertia switch. It contains a neon light that operates whenever current flows from the induction coil. This indicator light shines brightly whenever the current passes from one electrode to the other. It serves to indicate when the unit is operating and in adjusting the inertia switch to the gravity force needed for its activation. A series of resistors and a potentiometer offer a selection of voltages after the current emerges from the induction coil. The unit is mounted on the rear billet of the saddle. The current reaches the horse through electrodes which protrude through the billet. These electrodes remain in contact with the horse. The unaltered high voltage current is used to teach a horse not to buck.

Abstract: The walls of a stable building bound an animal shelter in the building and normally separate the shelter from the ambient atmosphere. A vertically extending wall portion includes an outer shell and an inner shell which define a space therebetween. An opening in the inner shell connects the space with the shelter. A heat exchanger mounted on one of the walls defines first and second, separate conduits. The first conduit connects a portion of the afore-mentioned space remote from the opening with the atmosphere for discharge of exhaust air from the shelter. The second conduit connects the atmosphere with the shelter for flow of fresh air into the shelter in thermal contact with the exhaust air.

Abstract: The section modulus of elasticity of the body portions of the scraper blades in a meat scraping machine decrease substantially uniformly outwardly along each blade. The blades have flat, transversely flexible scraping edges on the ends opposite a common series of circular hubs. Each hub is slightly rotated with respect to the adjacent hub to provide a series of spiraling blade-like edges for engaging and scraping accumulated residues from the sawed surface of a piece of meat. An adjustable doctor blade removes the residue from the scraper blades. The uniformly decreasing section modulus of elasticity of each blade encourages uniform flexing along the length of each blade to distribute stresses and fatigue uniformly throughout the blade material. The blades are pre-flexed on the hubs to reduce the effective diameter of the blade structure and to reduce the flexing of the blades when encountering the meat and the doctor blade.

Abstract: A display mount and method of making same for holding calendars, photographs, and the like, is provided with a rectangular backing panel, an intermediate spacing panel mounted adjacent thereto, and a partial face panel mount in the front of the intermediate panel. The panels have been case bound with a facing material and die cut to form one or more mounting wells therein. The pockets for the mounting well use only a partial face panel allowing for easy removal of the die cut portions, and the reduction of the weight of the display mount. The method includes cutting a single piece of planar material and scoring parallel lines for folding into three panels.

Abstract: An intra-oral orthodontic spring appliance is provided which consists of a metallic coil spring having an enlarged tension releasable means at one end which engages fixed spring mounting means in the mouth and a tail at the other end which engages suitable means on a tooth to be repositioned. Preferably, the enlarged tension releasable means is an open coil spring formed over a portion of a closed coil spring. When the closed coil spring is passed through a fixed spring mounting means, e.g., a buccal tube, and attached to a tooth to be repositioned, the retractive force is provided by compression of the open coil spring and expansion of the closed coil spring.

Abstract: Disclosed is a device advantageously usable for dental therapy and examination, which is an elongated bundle of axially extending fibers. The elongated bundle is tapered at one or both of its ends, and the fibers are bonded to each other in places along their lengths so that the fiber bundle is coherent and the fibers define capillary passageways therebetween.

Abstract: A tally system of article identification to be mounted on an article support such as a garment hanger is disclosed. In one form, tubular tallies are initially manufactured as an extruded tube and then severed into individual units of suitable length. In another form, they are individually manufactured. The article support may be provided with an upstanding boss or other projection over which the tallies are seated. The tallies and boss or other projection may be equipped with means for circumferentially indexing the tally to assure proper display. The tallies, as used, preferably have suitable information indicia applied to their exterior surface.