Abstract: A control circuit for a solid fuel furnace which includes a combustion chamber, means for delivering solid fuel to the combustion chamber, and means for delivering combustion air to the combustion chamber, wherein the control circuit includes thermo-sensitive means responsive to a demand temperature and to a temperature related to furnace performance to control the fuel delivery means and the combustion air delivery means for maximum furnace efficiency, minimum fuel consumption and minimum soot and smoke formation. In addition, the control circuit includes "hold fire" circuit which is operable in response to combustion-related temperatures and during periods when the demand temperature is met to control the fuel delivery means and the combustion air delivery means to maintain combustion in the combustion chamber.

Abstract: A solid fuel furnace which includes a housing enclosing a firebox and a heat exchanger chamber. An open grate in the firebox supports solid fuel thereon. Combustion air is admitted to the area below the grate and is preheated and passes upwardly through the grate and fuel and mixes with volatile gases released from the fuel. The air/gas mixture is drawn downwardly through the fuel and exits the firebox through an inlet to an insulated burn-out chamber which is behind the firebox. A metal screen covers the inlet and serves to ignite the air/gas mixture. Hot flue gases exit the burn-out chamber to the heat exchanger chamber.

Abstract: A thoracentesis device which includes an elongated flexible catheter fixed at its proximate end to an elongated conduit which is aligned therewith. The conduit is provided with a seal which seals around a hollow needle which penetrates the seal means and passes through the conduit and the catheter and slightly beyond the catheter distal end. A vacuum source is connected to the proximate needle end. The seal also reseals the elongated conduit when the needle is removed. The conduit includes a valve which can be manipulated to connect the catheter to a side conduit when the needle is removed.

Abstract: A control circuit for a liquid fuel combustion apparatus which employs a differential amplifier and square-wave generator to maintain a strong constant combustion in the burner until the differential amplifier senses that room temperature has approached a preselected target temperature, at which point the differential amplifier operates to alter the square-wave generator output to gradually reduce the combustion rate in an inverse proportion to room temperature as the target temperature is being reached. The differential amplifier subsequentially controls the square-wave generator in a manner which causes fuel to be available at a rate necessary and sufficient for maintaining the target temperature.

Abstract: A solid fuel furnace which includes a housing enclosing a firebox and a heat exchanger chamber. An open grate in the firebox supports solid fuel thereon. Combustion air is admitted to the area below the grate and is preheated and passes upwardly through the grate and fuel and mixes with volatile gases released from the fuel. The air/gas mixture is drawn downwardly through the fuel and exits the firebox through an inlet to an insulated burn-out chamber which is behind the firebox. A metal screen covers the inlet and serves to ignite the air/gas mixture. Hot flue gases exit the burn-out chamber to the heat exchanger chamber.

Abstract: A gasified liquid fuel combustion apparatus for supplying a gaseous mixture of air and a gasified liquid fuel to a burner for combustion. The apparatus includes a gasifying device which comprises two spaced concentric tubes having a concentric inner tube therein. An electric heater is positioned in the space between the inner tube and the two concentric tubes and heats a chamber between the concentric tubes. Fuel is admitted to the lower rear end of the chamber and is gasified and then exits the gasifier through a nozzle connected to the forward end of the chamber. A solenoid controlled valve is operable to open and close the nozzle.

Abstract: A gasified liquid fuel combustion apparatus which includes a gasifier in which liquid fuel is heated and gasified and delivered to a burner for combustion. A nozzle provided at the outlet of the gasifier is opened and closed by a valve needle operated by a solenoid. A solenoid control circuit includes first and second rectifying circuits between a power supply and the solenoid. A normally closed switch which is opened by a timer circuit is between the power supply and the first rectifying circuit, and a voltage reducing transformer is between the power supply and the second rectifying circuit. The first and second rectifying circuits are connected to a common output line so that a high DC voltage is supplied to the solenoid when the normally closed switch is closed and a low DC voltage is supplied to the solenoid when the normally closed switch is open.

Abstract: A method for creating an embossed effect in a desired pattern on a film by printing an agent on said film in said desired pattern to lower the stability of said film in the print areas against heat distortion and laminating said film to a substrate by fusion immediately after the substrate is extruded to cause said print areas to distort and give an embossed appearance as a result of the heat incident to the fusion.

Abstract: A furnace for firing refractory ware including a vertically movable bell adapted to enclose a car of refractory ware. Means is provided to seal the enclosure defined by the bell, to evacuate air from the sealed bell enclosure, and to deliver a fluidized, chemically inert, non-combustible, high thermal absorption material to the evacuated bell. A plurality of lasers are provided on the bell facing spaced locations therein and are adapted to be fired sequentially. When fired, the light and heat energy from each laser beam is diffused and absorbed by the inert material and is then re-radiated throughout the bell enclosure to fire the refractory ware therein.

Abstract: A portable, electric cut-off machine including an electric motor powered abrasive disc. Front and rear handles are provided for convenient two-hand operation of the tool and are electrically isolated for operator protection. A protective guard encompasses substantially 210.degree. of the abrasive disc and is adjustably mounted in novel fashion on the housing and one of the handles. A supporting shoe is adjustably attached to the guard. The tool is constructed so that parts may be reversed for either right-handed or left-handed operators.

Abstract: An improved chuck key and spring pocket for holding the key. The key comprises a sliding cross bar having paddle ends, and the spring pocket cooperates with this cross bar. The pocket opening accepts the key in one orientation only, and then the paddles are used to cam the key tightly into the pocket.

Abstract: A sharpener having a clam-shell housing in which a motor is mounted for driving a grinding wheel disposed adjacent one end of the housing, a chuck which holds either twist drills or a diamond dresser, the chuck being indexable 180.degree. about its axis, and structure for mounting the chuck relative to the grinding wheel so that either the twist drill can be moved in a prescribed manner across the grinding periphery of the grinding wheel, or so that the diamond dresser can be moved across the grinding wheel in order to dress the wheel to a form suitable for sharpening twist drills or the like, and also means for moving the twist drills or the like or diamond dresser towards the grinding wheel.

Abstract: A power miter saw of the type comprising a bridgeshaped base member and a main swinging lever pivotally mounted therebelow for motion about a vertical axis, the improvements which comprise a one hand operated detent and locking means at the front end of the swinging lever; and an improved saw mounting means at the rear end of the lever which defines the upper and lower limits of motion of the saw, which permits locking the saw down close to the base, and which normally bias the saw to a "ready" position.

Abstract: A safety deflector assembly for the discharge chute of a power lawn mower is provided. The deflector assembly comprises a deflector or guard plate pivotally mounted on the mower deck adjacent to the discharge chute and normally biased toward a guard position, and a latching mechanism automatically operable upon movement of the deflector to its guard position located in the path of movement of material discharged from the discharge chute for latching the deflector in its guard position. The latching mechanism is manually operable to unlatch the deflector to permit manual movement of the deflector away from its guard position out of the path of movement of the discharged material to permit attachment of a grass catcher to the discharge chute.

Abstract: A portable, power operated, hand cultivator comprising a frame having a motor supported thereon which, through a transmission, oscillates two or more generally vertically disposed cultivator tines extending downwardly from the frame. A handle is provided for easy control and manipulation of the device.