Abstract: An improved shield for a pipe joint is described that includes an elongated body to be wrapped around a pipe coupling, formed from a strip of pliable fabric. One or more fabric liner strips is disposed within the body, and means are provided for separably connecting its ends together. The liner strips are loosely slidable relative to the body during wrapping of the assembly of the body and liner strips around the pipe coupling. One or more display means for monitoring the coupling integrity are held against the fabric body in assembled relation by a clear envelope means. The display means is formed from a sheet of chemically sensitive material having an indicating means thereon which, upon contact with leakage from the pipe coupling, provides a visual indication of such leakage.

Abstract: A disposable container consisting of a tetrahedral-shaped chamber and a base member formed from a paperboard blank pre-coated with an adhesive layer and having folding guides at desired locations to provide the base with arms to hold the chamber. The chamber is formed from a segment of flexible plastic tubing, sealed at the bottom and sealed at the top on a line transverse to the sealing line at the bottom to form the tetrahedral-shaped chamber. The chamber is stably mounted on the base member, which provides a wide surface for supporting and protecting the tetrahedral chamber and also provides labeling surfaces for the container.

Abstract: A container or reservoir for liquid to be heated, has a pump well and heater assembly secured to and depending from the bottom wall of the container, and a pump and pump tube assembly can be positively locked on the well for pumping function but is easily and quickly removable for cleaning or replacement. The assembly is locked on the well by a retainer plate fixed to an outer pump tube and having locking portions coactive with locking portions on the side wall of the well, with said outer tube being telescopically slidable and rotatable on an inner pump tube which carries a pump plate to seat in the well and a valve disk co-operative with said valve plate. A compression spring is disposed between the retainer plate and the pump plate locking portions to hold the retainer plate interlocked with the well locking portions and to hold the pump plate seated in the well.

Abstract: A sample book has an internal spine directly connected to the pages of the book. Mounting projections from the internal spine project through the cover of the book for direct attachment to a pivotally mounted carrying handle.

Abstract: A teaching machine utilizes a card having recorded on it visually readable statements of problems and corresponding machine readable answers. The teaching machine displays the answers to the problem on the card positioned for solution only if the student first enters the correct answer on the keyboard. The teaching machine also includes interrogating devices for counting the number of attempted solutions and the number of correct answers by the student, along with devices to display the contents of the counting devices on the display.

Abstract: A carton of a suitable protective flexible plastic or plastic coated material includes a plurality of ovoid cavities for receiving eggs, each cavity having a plurality of communicating channels with tapered sides. The material provides a waterproof base to permit further use of the egg carton as an ice tray. The channels permit water flow between adjacent cavities and provide stress points to facilitate separation and removal of ice cubes formed in the cavities.

Abstract: Apparatus for forming, interleaving and dispensing meat patties has a chopped meat feeding unit which supplies meat to a continuously cycling molding apparatus to form meat patties. An interleaving paper dispensing apparatus positions individual sheets of paper on support means beneath the output point of the meat patty molding mechanism so that each meat patty formed will be interleaved between separate sheets of paper. The support means for the interleaved patty are actuated by the weight of the patty to rapidly withdraw, causing the patty and interleaving sheet to fall and form a stable stack.

Abstract: A machine for inserting a pouring spout at a precise, predetermined position on a canister wall, which machine consists of a first holding means that releasably holds a canister on a carriage that moves in a discontinuous manner through a series of work stations. At one of the work stations, the canister is temporarily released by the first holding means and captured by second holding means associated with a turntable that is rotatably positioned by means responsive to a control signal generated from scanning means at the work station, which sense the position of an indexing mark on the canister. After the turntable and the canister are positioned, the canister is released by the second holding means and carried by an elevator back to the carriage where the canister is held in the indexed position by the first holding means and continues through the remainder of the work stations.

Abstract: A jaw for use in a clamp in which there are two relatively movable jaws on a frame to clamp board stock between them, said jaw including a body and a face plate having a rib abutting the face of said body as a horizontal fulcrum for rocking of the face plate, and a spring device engaging both said body and the rear side of said face plate on at least one side of said rib and constituting a resilient mounting of said face plate on said jaw body providing for even distribution of the clamping force to the upper and lower portions of the boards, one form of the resilient mounting means including two brackets held on the jaw body by a tension spring connecting the brackets and extending in a groove across the front side of the face plate, each bracket having resilient arms engaging the back of the face plate at opposite sides of said fulcrum.

Abstract: An improved snow and sleet detector having a pair of substantially parallel detector screens spaced one below the other, the upper screen being open to the ambient. A rim is included which is highly thermally conductive and electrically conductive and encompassing the upper screen proximate the edges thereof. A thermostatically controlled heater is mounted in intimate thermal and electrical contact with the rim for maintaining the rim and detector screens at a temperature high enough to melt snow or sleet falling thereon. Circuiting is described for providing an electrical indication when the detector screens are conductively coupled by melting snow or sleet.

Abstract: A hand-held teaching machine is used in conjunction with a card having recorded thereon columns of visually readable statements of a plurality of problems and corresponding columns of machine readable answers. The machine has viewing apertures for allowing a student to view individual problems presented on the record member in either an equation or algorithm format and an answer display positionally associated with the viewing apertures for displaying the answer entered on the machine keyboard. Means are included in the machine for allowing the digits of a multidigit answer to be entered either from right to left or left to right, and for causing the display to flash repeatedly if the entered answer is correct. Means are also provided for storing information identifying which of the attempted problems were answered incorrectly and retrieving the stored information in response to a predetermined interrogation signal. The machine also has means for allowing it to be used as a calculator.

Abstract: Porous friction facing materials containing cellulose fibers are coated with an impregnant of ethyl silicate to provide automatic transmission clutch plate and band linings of improved frictional properties, durability, wear and heat resistance, without use of asbestos. A sheet of paper-like fibrous material may be first impregnated with a phenolic resin binder which is cured to form a first coating and then impregnated with a hydrolyzed solution of ethyl silicate in a solvent. The material is further heated to drive off the solvent and cure the ethyl silicate to form a second outer coating having a higher coefficient of friction than the first coating. The silicate impregnated lining is then bonded to the steel plate or band. Alternatively, the resin impregnated lining material may be first bonded to the metal plate and then the entire plate assembly is impregnated with the ethyl silicate solution and cured.

Abstract: A siphon includes an inverted U-shaped tube providing a passage between a main and an auxiliary container of water. A longer leg of the tube is connected to the upper end of a first section of an enclosed chamber which extends deeply into the main container. The chamber is partitioned into two adjacent longitudinal sections by a common wall having an opening at the lower end. The bottom of the second section is spaced above the base of the first section. The second section includes a flat plunger having a long movable vertical rod which extends out of the top. Water enters through inlets in the bottom of the first section and top of the second section until the chamber is full. A pivotable flapper valve controls the opening in the wall between the two sections. The rod and plunger are raised to the upper position and rapidly moved down to the edge of the bottom opening. This causes the valve to pivot away from the opening while blocking the inlet holes in the first section.

Abstract: A bracket assembly for supporting a device such as an air pump along the side wall of an aquarium includes an upper support angle member having a platform extending outwardly from the upper end of the wall, a vertical member having a lower portion extending along the side of the wall and an upper end extending through the support angle platform, and a slidable locking member which engages the support angle platform and vertical member upper end to secure the members together. The support angle platform includes a pair of outwardly extending end posts which are received in holes in the base plate of an air pump to support the air pump in a vertical hanging position. The bracket is compact and readily assembled by hand, reduces vibration and creeping caused by the air pump, and positions the air pump above the water level in the aquarium to reduce back flow siphoning of the water. The bracket also includes holes to receive and position air line tubing connected from the air pump into the water.

Abstract: Electro-hydraulic apparatus for actuating a friction clutch has a hydraulic actuating motor and electrical or electronic means to control the hydraulic motor through a control valve system, which includes at least one viscosity independent flow regulator to control flow of hydraulic fluid to or from the motor during operation of the clutch.

Abstract: A flue gate device operated by a solenoid whose energy comes from any outside source, which energy is controlled by the furnace burner control of the furnace to which it is attached. The pull of the solenoid is resisted by a spring which will restore the flue gate to an open position when the solenoid is deenergized or in case of an electrical failure in the flue gate device itself. Through relay switches, the solenoid is deenergized when the furnace burner is energized, and the solenoid is energized when the burner is deenergized, thus enabling a "fail-safe" condition, which enables the furnace to function completely free of the flue gate device.

Abstract: A rotary plug valve in which the plug has a special sealing means in its outer surface to contact the wall of the plug chamber in encircling relation to the inlet flow port of the valve body when the plug is in closed position, said sealing means including a generally circular disk having limited inherent resiliency seated in a recess in the plug and provided with a generally circular rib on its front side to encircle said flow port in sealing contact with the wall of the plug chamber. One form of disk also has a circular rib on its rear side to contact the bottom wall of said recess. An arcuate wire stop element coactive with a knob on the valve plug and having end portions insertable into recesses in the valve body is provided for stopping rotation of the plug selectively in different positions.

Abstract: A method and apparatus for feeding an additive, such as glass fibers, fillers, etc., to a plastic resin in an extruder is disclosed. The additive is fed by means of a screw type feeder into the barrel of a plastics extruder or reciprocating screw plastifier at a location where the resin is molten and the resin pressure is low.