Abstract: Hydraulic tappet comprising a cup member, the latter sliding in a seat and housing a second cup member sliding in relation to the first in such a manner as to form a first chamber, and a flexible annular member located essentially inside the said second cup member in such a manner as to form a fluidtight second chamber connected hydraulically to the said first chamber; the said two chambers being filled with activating fluid the flow of which from the said second to the said first chamber being controlled by an on-off member.

Abstract: Method of and apparatus for stabilizing a plasma stream by the use of two different stabilization liquids. The plasma arc is stabilized in the discharge chamber by a whirl of a first stabilization liquid containing at least one element chosen from the group consisting of carbon and nitrogen, and the plasma arc is stabilized in the stabilization channel by a second stabilization liquid differing in its boiling point from the first stabilization liquid. Between the discharge chamber of the burner and the stabilization channel there is provided a transition space from which there lead slit-like outlets for the stabilization liquids. In the transition space there may be placed an orifice plate dividing said space into two sub-spaces. From the stabilization channel upstream of the front nozzle of the burner there may be provided an outlet for the second stabilization liquid, which is disposed in the stabilization channel.

Abstract: A membrane assembly, for use in mass or heat transfer or filter apparatus, comprises a pair of generally parallel plates (7) spaced apart with a profiled surface of one plate facing a similarly profiled surface of the other plate. A pair of sheets of transfer membrane material (6) are positioned closely spaced face to face between the plates with each sheet supported by and partially nesting in the profiled surface of the adjacent plate. The two membrane sheets thus provide a conduit (5) for one fluid. Between each sheet and the adjacent plate is formed a conduit for the second fluid. In use each sheet presents in its surface facing the other sheet a regular array of close packed depressions (14) which partically nest in corresponding depressions (9) in the respective plates (7).

Abstract: Transfer membrane apparatus incorporates a number of parallel channels, each channel comprising a first conduit (5) for a first fluid formed between two closely spaced transfer membranes (6). The outer face of each membrane is supported against a profiled plate (7) such that second conduits for a second fluid are provided one on each side of the first conduit (5) between a respective membrane (6) and supporting plate (7). The supporting plates (7) are mounted spaced apart in a stack with the double membranes between each adjacent pair of plates. The transfer membranes (6) are provided as parts of a continuous web (6) of transfer membrane material which is folded in concertina fashion. One set of folds (11) each extends around the front edge of a respective plate (7) and the other set of folds (12) each closes a respective first conduit (5) adjacent to the rear of the stack.

Abstract: An apparatus for impacting on a hard surface such as concrete so as to break up the hard surface. This apparatus comprises a frame having a bed and an upstanding rail assembly projecting from the bed, a drive shoe, a hammer means attached to the rail assembly so as to be movable in only one direction and operatively connected to the drive shoe for impacting upon the drive shoe. The drive shoe lies adjacent the surface so that upon impact from the hammer means, the shoe forcefully impacts the surface so as to break up the surface. An adjustment means is used to selectively position the drive shoe relative to the hammer means.

Abstract: A football place-kicking practice holder has a base adapted to rest on a playing surface and support a football at its lower end when in a teed up position, an elongated rigid support member attached to the base and mounted in an upright position on the base such that it is spaced from one side of the football, and an elongated rigid arm being pivotally mounted to the support member for movement through an arcuate path downwardly toward, and upwardly away from, the football and in a direction extending generally transverse to the general direction of flight of the football when kicked from the teed up position. An outer end of the arm has a threaded section which is located between the support member and the football when the arm has been moved downwardly toward the football and a flexible hollow finger inserted on the outer end of the arm is disposed into contact with an upper end of the football for maintaining it in the teed up position.

Abstract: Hydraulic tappet essentially comprising a first cup member sliding in a seat; a second member sliding axially in relation to the first; a third annular member located inside the said first cup member and having a sleeve, inside the inner bore of which the said second member slides axially, and a ring projecting radially from the said sleeve and connected in fluidtight manner to the side wall on the said first cup member in such a manner as to form a first chamber for fluid under pressure; and a fourth annular member made of flexible material and located essentially inside the said first cup member and outside the said sleeve on the said third annular member in such a manner as to form a second activating fluid chamber connected hydraulically to the said first chamber over a duct with an on-off member.

Abstract: A speed changing device wherein the driver and driven pulleys can be replaced to attain a desired increase or decrease in rotational speed. The distance between the driver and driven pulleys is adjustable so that the tension of the drive belt coupling the driver and driven pulleys is also adjustable. The mounting plate upon which the motor and driver pulley are mounted can be tightened securely against the housing so that the previously set tension can be retained during the operation of the speed changing device.

Abstract: A sump pump assembly having a primary sump pump and a secondary sump pump and including a T-fitting for connecting together the outlets of the primary sump pump and the secondary sump pump to a common exhaust. The T-fitting contains a one-way valve on the secondary pump outlet connection and a fastening means for a water level sensing device.

Abstract: A calibration system for the keyboard of an electronic musical instrument. Compression of the key causes an output signal to be generated which varies in accordance with the amount of key depression. When the key is depressed to a nominally fully depressed position, the system stores an offset value relating to the difference between the actual output signal at this point and an expected reference output signal which would occur if the keyboard were perfectly adjusted from a mechanical standpoint. The offset value is stored in the memory and added to the key output signal during the normal operate mode of the instrument so that the output signal is adjusted in accordance with the offset value stored during the calibrate mode.

Abstract: An apparatus and method for making hollow shell cores wherein a core box assembly is provided including a vented pattern. Baffles are provided in the core box in the space between the pattern and the core box walls whereby a catalyst gas flowing into the core box through an entry port will be caused to enter the pattern and to flow along the outer layer of a sand and binder change in the pattern. The gas will then be caused to flow out of the pattern into a trapped gas vent and out of an outlet port of the core box. The continuous flow of catalyst gas through only the outside layer of the sand and binder charge in the pattern will only cause the outer layer of the charge to be cured and to form a hardened shell. After formation of the shell, the uncured sand and binder mixture in the shell will be discharged and reused. The shell is then transferred from the core box assembly.

Abstract: A keyboard system in a keyboard controlled musical instrument includes a pair of spaced apart electrode members and a pickup movable in the space intermediate the electrode members. Respective voltages are impressed on the electrodes to establish an electric field therebetween and the voltage impressed on the movable pickup is a function of its position relative to the two electrodes. The pickup is actuated by the playing key which contacts a resilient, yieldable stop. The force with which the playing key is depressed is measured by sensing when the key is fully depressed, initiating a count at that point and counting a predetermined period. At the end of the predetermined period the voltage on the pickup is detected which gives an indication of the amount of overtravel of the key beyond its normal depressed position. This detected voltage is used to alter the quality of the tones produced by the musical instrument.

Abstract: A suction accumulator including a tubular housing defining a liquid storage vessel. A conduit is arranged in the vessel and includes a divider plate for forming two fluid flow passageways. A plastic transition cap is secured to one end of the conduit to form a connection passage between the two fluid flow passageways. A tubular conduit extends from the liquid storage volume through the transition cap member and into the upflow passageway whereby liquid refrigerant is aspirated from the liquid storage volume into the upflow passageway. A screen member is provided in the transition cap member to prevent impurities from flowing through the tubular conduit into the upflow passageway. In one embodiment, a pair of pressure equalizing vents are integrally molded with the conduit to equalize pressures in the accumulator when the compressor is turned off. In another embodiment, a pressure equalizing vent directly connects the outlet of the accumulator to the liquid storage vessel.

Abstract: A control system for controlling a heating system having a heat pump and a source of supplemental heat. The control system monitors the defrost cycling of the heat pump, and when the heat pump is in its defrost cycle for more than a predetermined portion of a heating cycle, the heat pump will be shut down until the outdoor ambient temperature has risen by a predetermined amount or a given interval of time has elapsed. The heat pump is also shut down if the outside ambient temperature falls below a certain level and is automatically reenabled is the outside ambient exceeds a second level. The system results in more efficient operation of the heat pump/supplemental heat system by disabling the heat pump when weather conditions do not favor efficient heat pump operation.

Abstract: A control system for controlling a heating system having a heat pump and a source of supplemental heat. Simultaneous operation of the heat pump and supplemental heat source is monitored, and when such simultaneous operation occurs for a given portion of a heating cycle, the heat pump will shutdown until the temperature has risen by a predetermined amount or a given interval of time has elapsed. The heat pump is also shutdown if the outside ambient temperature falls below a certain level and is automatically reenabled if the outside ambient exceeds a second level.

Abstract: An improved air delivery system is provided for an impingement food preparation oven including a plurality of air ducts disposed in a cooking chamber, a plenum connected to the air ducts, and a scoop-type fan disposed in a backwall opening of the plenum to provide a flow of heated air smoothly and uniformly through the plenum into the air ducts. The fan device includes a plurality of tear-drop shaped blades, wherein each blade has a leading edge portion that tapers to a point in the direction of rotation and a trailing row portion at a given pitch angle for forcibly moving the flow of air in an axial direction toward the plenum front wall.

Abstract: A control mechanism for a hydraulic lifting assembly for supporting articles of furniture. The hydraulic lifting assembly includes a base, a support column secured to the base, a variable volume chamber, a fixed volume chamber and a control valve mechanism. The fixed and variable volume chambers are interconnected by a flexible conduit. The control valve mechanism includes a cam secured to a rotatable rod which is positioned so that, by rotating the rod, the cam will selectively pinch off the flexible conduit and prevent fluid flow therethrough. A spring is provided for normally urging the cam against the flexible conduit to pinch off the conduit. The control may be located in any convenient location due the flexibility of the conduit.

Abstract: Coil winding and placer equipment arranged on an indexing table and rotatable between coil winding and coil insertion stations. Coils are wound on a coil winding form by means of a flyer and are stripped from the coil form onto an array of pivotable coil retainers. The coil retainer array is arranged outside of and concentrically with the coil insertion blades whereby the coil retainer array retains a complete set of stator coils. A stator core is positioned above the placer equipment and the retainers are pivoted inwardly thereby releasing the complete set of coils which are now held only by the insertion blades. The blades are moved upwardly into the bore of the stator core and a coil stripper is actuated to insert the coils into the axial slots of the stator core.

Abstract: Preparation of 3,3'- or 3,4'-diaminobenzophenone by nitrating a chloronitrobenzophenone mixture obtained by the Friedel-Crafts reaction between 3- or 4-nitrobenzoyl chloride and chlorobenzene, and catalytically reducing and dechlorinating the resulting chlorodinitrobenzophenone mixture in the presence of a reduction catalyst and a dehydrochlorinating agent.

Abstract: A petroleum alcohol test kit and a method of testing petroleum for alcohol content both as to volume and type. The volume of alcohol present is determined by mixing a petroleum sample with a first colorimetric solution whereby the volume of alcohol can be visually determined. The type of alcohol present is determined by mixing the components of a second colorimetric solution for impregnation of a visual indicator. A petroleum sample is mixed with an acidified potassium permanganate solution and the resultant vapors contact the visual indicator whereby the color the indicator turns is indicative of the type of alcohol present. The kit has the necessary containers, support and solutions to carry out the testing.