Abstract: A gas burner device having a gas supply and a primary air supply and secondary air supply to the burner and a flue gas vent means leading from the burner for venting flue gases to a place of disposal. The device has a power driven fan in the flue gas vent for providing simultaneously a forced flow of flue gases away from the burner flame and of primary and secondary air to the flame, a temperature responsive variable speed control for controlling the power supply to the fan motor and thereby the speed of the fan and the rate of movement of the exhaust gas from the burner and flame and primary and secondary air to the flame in direct proportion to the temperature of the flue gases.

Abstract: A heater band formed of an extruded metal channel member and a heater plate assembly received within a slot extending along the length of the channel. The heater plate assembly and the extrusion are compressed together to provide a heater band having a dense cross section resulting in improved heat transfer characteristics. The heater band in accordance with the present invention has a longer life and higher heating capabilities than heater bands known to the prior art.

Abstract: A hydraulic system including a hydraulic pump, a hydraulic motor having at least one port and a hydraulic reservoir. A main spool valve is interposed between the motor and the pump and reservoir and has a spool shiftable between positions connecting the pump to the port, connecting the reservoir to the port, and blocking fluid flow to or from the port. A single combination check and flow control valve is interposed between the main spool valve and the port. A fluid responsive surface opens the combination valve to permit relatively free flow of fluid therethrough when the spool is in the first mentioned position thereof. A pressure responsive surface and a control valve provides for partial opening of the combination valve to meter fluid flow therethrough when the spool is in the second position thereof. A spring is operative to close the combination valve to prevent fluid flow therethrough when the spool is in the last mentioned position thereof.

Abstract: A bubble oxygenator having a generally cubic exterior housing with a gas dispersion system having a one-way valve that prevents the backflow of blood into the oxygen supply. At one end of the oxygenator housing is a generally vertically extending bubble chamber having a movable wall to vary the flow capacity of the oxygenator. Formed separately from the bubble or oxygenating chamber is a generally horizontally extending bubble collection chamber in the top of the cubic housing. The bubble collection chamber is formed by a rectangular envelope shaped, defoaming mesh and filter assembly. A planar temperature controlled ramp receives debubbled blood from the bubble collection chamber and directs it in planar fashion downwardly toward the reservoir.

Abstract: A positioning control system for a manually operated machine tool. When programmed by an operator, the system provides a visual indication of the necessary incremental movement of a movable member, as a machine tool bed, to a series of desired preselected positions. The system displays a zero indication when the operator reaches the desired position. The incremental movement to the next position is then displayed, permitting the operator to move the movable member to that position under the guidance of the display which again goes to zero when the position is reached. The system permits the operator to enter the location of each desired preselected position, and entry of each position may be made with respect to a common reference coordinate. Each position is stored in a memory for repeated use in guiding the operator in positioning the movable member.

Abstract: A bubble oxygenator having a generally cubic exterior housing with a gas dispersion system having a one-way valve that prevents the backflow of blood into the oxygen supply. At one end of the oxygenator housing is a generally vertically extending bubble chamber having a movable wall to vary the flow capacity of the oxygenator. Formed separately from the bubble or oxygenating chamber is a generally horizontally extending bubble collection chamber in the top of the cubic housing. The bubble collection chamber is formed by a rectangular envelope shaped, defoaming mesh and filter assembly. A planar temperature controlled ramp receives debubbled blood from the bubble collection chamber and directs it in planar fashion downwardly toward the reservoir.

Abstract: An interchangeable tube is disposed and retained within a hollow rotor shaft of an electrical machine to form an axially extending cavity between the tube and the hollow rotor shaft. Oil flows into the tube from an oil supply, through holes in the tube, and into the cavity, and is sprayed from holes in the hollow shaft for cooling and lubricating the electrical machine. The configurations of the hollow rotor shaft and the interchangeable tube facilitate removal of the tube from the hollow rotor shaft without complete disassembly of the electrical machine. Thus, tubes having different hole diameters and hole configurations can be interchanged to accommodate different oil flow requirements and different oil pressures established by constant speed drives or auxiliary power units coupled to the electrical machine.

Abstract: A thermal switch having contacts with one contact being movably mounted on a carrier and with movement of the carrier controlled by a bimetal actuator disc. The actuating movement is transmitted through a striker pin of molded ceramic material which is fastened in fixed relation to the carrier by a layer of adhesive of controllable thickness to establish the effective length of the striker pin.The method of manufacturing the thermal switch embodies holding of the striker pin in fixed predetermined relation to components of the thermal switch. During movement of the parts to this position, a mass of adhesive carried at an end of the striker pin is pressed between the end of the striker pin and the carrier to provide lateral flow thereof until said pressing is discontinued to provide a controlled thickness layer of adhesive which is then set with the parts held in a predetermined relation.

Abstract: A process of forming glass balls by treatment of particulate vitreous material and a second material comprising carbon material and a carbonated salt. The process is carried out at a temperature, for the particular particulate vitreous material, which corresponds to a viscosity of from about 10.sup.6 to about 10.sup.3.5 poises with mixing and agitation.The apparatus includes a furnace having a tube (4) adapted to rotate about an horizontal or inclined axis, delivery means (10, 12, 14) to the tube for the materials to be treated, and heating means (8, 20) for heating the tube and the bed of material from both an external and internal location.

Abstract: A test stand including a coupling for coupling a dynamometer to a drive sprocket of a vehicle to be tested and including a housing adapted to be rotated about an axis and having elongated guides in a plane generally transverse to the axis, at least two slides movably received in the guides, a screw shaft journalled for rotation in the housing and connected to the slides, the screw shaft being fixed against substantial longitudinal movement within the housing and, when rotated, effecting simultaneous movement of the slides towards or away from the axis, detents carried by the housing and engaging the screw shaft for holding the screw shaft against rotation, and a plurality of teeth, one for each slide, each mounted on an associated slide and extending therefrom in a direction generally parallel to the axis for receipt between the teeth of a sprocket.

Abstract: A fluid flow device having a biased closure structure for selectively closing an opening in a flow conducting structure. The closure includes a pair of closure members pivoted relative to a transverse axis of the opening and biased to the closed position by a spring which is maintained spaced from the closure members in the closed position thereof. The spring has a midportion which is brought into engagement with the closure members as an incident of the movement thereof to and beyond a preselected position intermediate the closed and fully opened positions of the closure members. The spring acts to resiliently bias the closure members toward the closed position as result of the spring tension between the closed position and the intermediate position and the abutment of the midportion of the spring with the closure members at and beyond the intermediate position permits the closure members to be swung toward the fully open position with a decreased force.

Abstract: A baling machine for making large rectangular bales of straw or hay has a bale chamber with an entry opening at one end. Material is fed under compression to the entry opening to fill the chamber. So that the bale is formed of consolidated columns of material a guide is located adjacent the entry opening and can be moved in and out of the chamber after each column is formed.Pivoting of the guide pushes completed columns along the chamber to make way for incoming material.

Abstract: Apparatus for the polymerization of an olefin in a particle form process to form solid particles of polyolefin in a liquid slurry in a polymerization zone and the solid polymer particles are separated from the liquid diluent and any unreacted monomer, in which a portion of the slurry is diverted in the polymerization zone through a liquid cyclone separator. This separator has a separating portion thereof in heat exchange relationship with the zone liquid. After the separation in the liquid cyclone the clarified separated liquid is returned continuously to the polymerization zone and the resulting concentrated slurry is directed to a place of separation of the polymer particles.

Abstract: A method of and an apparatus for converting a first series of pulses into a second series of pulses having a frequency proportional to the frequency of the first series. The method and apparatus are particularly useful for providing a series of equally spaced pulses representative of the speed of a rotating gear in revolutions per minute (RPM). A proximity detector provides a pulse as each tooth of the gear traverses the face of the proximity detector and a sample period is formed by the passing of several teeth. A series of pulses is counted by a counter for the length of the sample period. The number of pulses at the end of the sample period is stored in a latch. A programmed divider counts down from the count in the latch to zero at a reference frequency and an output pulse is provided each time the programmed divider reaches zero. The programmed divider is reset to the count in the latch upon the occurrence of each output pulse.

Abstract: A compressor discharge valve assembly utilizing a cylindrical cavity in which is provided a discharge flow control valve and a valve stop for limiting the opening movement of the valve during operation of the compressor. The discharge valve chamber defines a cylindrical portion into which opens an outlet from the compression chamber. A cylindrical recess is provided in the wall of the discharge valve chamber for receiving a securing portion of the valve stop. The valve stop may further include a spacer for maintaining an arcuate backup portion thereof in inwardly spaced relationship to the valve. The valve is biased to engage the discharge valve chamber wall adjacent the outlet passage. The valve may be defined by a resilient arcuate member secured at one end to the valve stop whereby the valve is cantilevered from the securing means to extend over an arc of approximately 180.degree. to have a distal portion disposed in closing relationship to the outlet passage.

Abstract: An ice maker having structure for forming an ice column which is passed through a constricting nozzle. A delivery structure is arranged to receive the ice column and cause selectively the shearing of the ice column into full sized ice bodies, approximately half size ice bodies, or cracked ice. The delivery structure may include a breaker tube having an inwardly directed projection and defining a deflecting structure for shearing the ice at preselected intervals. The delivery structure may further include a selectively installable adapter defining a second inwardly directed projection for causing shearing of the ice column at preselected intervals less than that effected by the projection in the breaker tube. A blade may be removably associated with the adapter for selectively causing shattering of the ice column so as to form cracked ice, when desired. An extension tube may be associated with the breaker tube for delivering the ice bodies and cracked ice in any direction from the ice maker.

Abstract: A supply or demand margin valve for use in hydraulic systems having at least one load provided with hydraulic fluid under pressure by a main pump, a pilot pump and at least one control valve for the load. The margin valve includes a valve body having a bore with a spool reciprocally received within the bore. A first port in the body extends to the bore and is adapted to be connected to the pilot pump. A second port in the body extends to the bore and spaced in relation to the first port and is adapted to be connected to a component of a hydraulic system other than a pilot pump. A spring is disposed in the valve body for applying a biasing force to the spool to urge the spool in one direction and a third port is in fluid communication with the pressure responsive surface and is adapted to be connected to a main pump so as to apply a force to the spool to urge the spool in the same direction as the spring.

Abstract: A tire changer including a base adapted to be supported upon an underlying surface, a tire supporting table disposed in an elevated position on the base and comprising at least three radially outwardly extending arms, a plurality of hook-shaped notches in the upper surfaces of two of the arms and opening upwardly to define hooks directed towards the center of the table, a plurality of rim clamps, each comprising a pair of spaced plates with aligned hook formations adapted to engage the rim of a wheel placed on the table and interconnected by two spaced rods, the plates being spaced sufficiently so as to straddle a corresponding arm with one of the rods received in a selected one of the notches in the other of the rods in substantial abutment with the upper surface of the corresponding arm to locate the associated hook formation above the corresponding arm in a position opening toward the center of the table at a location generally radially outwardly with respect to the arm of the pin received in the notch, at

Abstract: A connector for connecting one type of windshield wiper arm end to a cross pin-type wiper blade. The arm end is releasably attached to the connector which connector has a body portion with a pin-receiving slot on the forward end thereof. The orientation of the pin-receiving slot with respect to the longitudinal axis of the body portion is such that to assemble the arm to the pin on the blade, the axis of the arm and connector relative to the longitudinal axis of the blade approaches 75.degree. to 90.degree.. The pin-receiving slot is forced over the pin on the blade to seat the pin in the slot. Once the pin on the blade is in the slot in the connector, the arm is pivoted relative to the blade until the axis of the arm is substantially parallel to the axis of the blade.

Abstract: A vehicle drive system including a rotary output, variable displacement, hydraulic motor (22) adapted to drive a wheel or the like, a pump (10) for providing hydraulic fluid under pressure to the motor, a pressure control valve (30) connected to the motor for regulating the displacement thereof to achieve a desired system pressure and having a pressure responsive surface (34) receiving a signal representative of system pressure and a biasing spring (36) acting in opposition thereto. The invention contemplates the improvement wherein a variable, settable, pressure reducing device (60,106) is connected to the pump and to the pressure control valve to apply hydraulic fluid under reduced pressure to the pressure control valve in bucking relation to the system pressure signal.