Abstract: The invention relates to a circuit for synthesizing either simple or complex waveforms of the type used in electronic musical instruments, such as electronic organs. In the specific embodiment disclosed herein, the synthesizing circuit is utilized in a rhythm unit for producing a damped sine wave charateristic of certain drum sounds. Opposite polarity waveforms are simultaneously produced by a switched capacitor technique driven by an attack/decay clocking signal and under the control of a keying signal received from a suitable low frequency rhythm clock source. The positive and negative waveforms are alternately selected in order to produce bipolar pulses at the frequency of the desired tone, and these pulses are connected to the input of a switched capacitor filter that modifies the pulses to produce a sine wave signal having an amplitude following that of the desired damped envelope.

Abstract: A low thermal conductivity removable heat insulating cover for a cooking utensil lid handle has a hand grip portion for substantially surrounding the lid handle at least along a central portion thereof with a pair of closely adjacent portions depending downwardly from the hand grip portion toward the lid surface and with a protective portion adapted to lie closely adjacent the lid surface covering a region of that surface to form a barrier for preventing a user's hand from contacting the lid when grasping the hand grip portion is disclosed. In one form the protective portion comprises first and second lateral extensions of the ends of the closely adjacent portions remote from the hand grip portion with the cover being formed as a section of an extrusion of substantially uniform cross-sectional configuration. The closely adjacent portions may be releasably joined together by a rib and groove arrangement along the adjoining surfaces thereof.

Abstract: Overload protection for a multispeed motor is provided in the form of a plurality of line break motor protectors positioned in good heat transfer relation with the motor windings and having heating elements in circuit with the motor windings to be responsive to excessive winding current and/or excessive winding temperature to disable the windings. Certain of the line break motor protectors are operational in more than one motor speed configuration. The line break motor protectors may be of the self-resetting temperature sensing variety and circuitry is included to insure that the motor does not restart until all protectors are reset subsequent to an overload condition.

Abstract: An installation for extracting useful work, such as driving an electric generator from a fluid stream, includes a platform rotatable about a central axis and supporting a plurality of blades or vanes, each of which is rotatable about its individual blade axis to vary the angle of attack between the blades and the fluid stream during each revolution of the platform. The blades are coupled together so that each blade executes a similar motion during each platform revolution and so that the angle of attack of the fluid stream relative to a given blade is substantially zero when the fluid stream direction is perpendicular to the plane including the central platform axis and the axis of the given blade, the amount of variation in blade angle of attack during each revolution is variable to compensate for variations in the fluid flow.

Abstract: A steam heated drying cylinder for machines for making paper comprising a cylindrical shell having inner surfaces thereon. The cylindrical shell includes a center region of substantially uniform thickness, end flanges extending radially inwardly of the center region, and transition regions between the center region and end flanges. The transition regions have inner surfaces that taper radially outwardly from the end flanges toward the center region. An insulation layer is disposed on the inner surfaces of the transition regions so as to provide substantially uniform drying along the width of the paper being made.

Abstract: The present invention relates to a mechanical press, and in particular to a guiding arrangement for the reciprocating slide of such a press. The press comprises a crown and bed and a plurality of vertical uprights connecting the crown and bed. A plurality of guideposts are rigidly connected to the crown and depend downwardly therefrom, the guideposts being parallel to each other and substantially perpendicular to the plane of the bed. The guideposts each have free ends which are unsupported and terminate short of the bed of the press so that the parallelism of the guidepins is determined solely by their connection to the crown. In order to counteract the non-vertical forces exerted on the slide by the connection arms, which tend to cause the slide to tilt about a horizontal axis perpendicular to the axis of the crankshaft, bearings are mounted between the connection assembly and the crown.

Abstract: A lubricating device, especially for use with a hermetic motor compressor unit, having a vertical shaft extending downwardly into a lubricant sump. The lubricating device comprises a pick-up tube having a larger diameter upper cylindrical portion open at the upper end thereof and adapted for being fitted into a central bore in the shaft, a smaller diameter lower cylindrical portion adapted to be immersed in fluid in the sump, a tapering transition region connecting the upper and lower cylindrical portions, an inlet port extending axially into the lower end of the lower portion, and the pair of diametrally opposite ribs on the lower cylindrical portion comprising ridges on the inner surface and corresponding hollows on the outer surface thereof.

Abstract: The invention relates to a mechanical press and in particular to a means for achieving thermal stability, particularly shutheight stability, by utilizing the waste heat from lubricant circulated through the drive assembly to heat the uprights. The oil is circulated through the crankshaft and connection arm assembly in the crown and then caused to flow through a thermal transfer device mounted to each of the uprights wherein the heated oil transfers a portion of its heat to the uprights so that they elongate due to thermal expansion at the same rate as the connection arms. The thermal transfer devices comprise a plurality of baffles over and through which the oil flows under gravity or pressure, wherein the baffles cause the oil to form a plurality of vertically spaced pools in good thermal contact with the uprights.

Abstract: A one piece heat insulating cover for a closed loop cooking utensil handle is disclosed having a body of resilient rubber-like material with low thermal conductivity with a hand grip portion for substantially surrounding the utensil handle and a protective portion which lies adjacent a portion of the utensil main body between the utensil handle and the main body when the hand grip portion is in position about the utensil handle so that the protective portion provides a barrier to prevent a user's hand from contacting the utensil body when grasping the hand grip portion. The hand grip portion is formed as a generally U-shaped hollow tubular member with the protective portion extending between the ends of the U and with the hollow tubular member being slit along an edge thereof between the ends of the U to facilitate placement and removal of the tubular member about the handle.

Abstract: A system for use in electronic organs and electronically actuated organs wherein a pattern of notes sounding as if played on the accompaniment or solo manual are played from the pedalboard. The pedalboard is encoded such that depression of a pedal will generate an encoded binary word corresponding to a chord having as its root the note corresponding to the depressed pedal. Individual notes of the chord are played in a rhythmic sequence at a rate determined by the rhythm generator of the organ and in a pattern which can be selected by the organist. As the pattern is being automatically played, the organist is free to manually play a melody on the solo manual and accompaniment chords on the accompaniment manual. The pattern is changed from a major key to a minor key having the same root note by actuating a knee paddle.

Abstract: The invention relates to a hydraulically actuated feed roll lift mechanism for feeds utilized to feed strip stock into a machine, such as a mechanical press. Regulated hydraulic pressure acting against a piston that is connected to one of the feed rolls through a yoke forces the feed roll against the stock to grip the stock and cause an increment thereof to be fed into the press when the rolls are rotated. A roll opening cam, which is connected to the press crankshaft, advances a small piston to displace oil against the other side of the piston while the stock is at rest to thereby separate the rolls during the time that the dies are in contact with the stock in the press. The time at which roll separation is initiated is controlled by adjusting the angular position of the cam on its shaft, as by releasing a frictional lock mechanism, rotating the cam to the desired position, and then again locking it in place.

Abstract: A central processor for an electronic organ in the form of a single, forty pin integrated circuit chip employing multiplexed technology and trinary and tri-level inputs to obtain maximum usage from each pin. The solo manual keys, chord keys, rhythm pattern switches and other control functions are multiplexed externally of the chip, fed into the chip as a time division multiplexed four bit byte over four pins, and demultiplexed internally of the chip. The solo manual information is multiplexed internally of the chip to form a single serial data stream, is combined with solo fill note data generated within the chip and then brought out over a single pin for external demultiplexing. The twelve tones of a musical octave are brought into the chip over twelve pins together with various static control signals, are decoded by tri-level decoders internally of the chip, and then utilized to generate the tones of the chords, also internally of the chip.

Abstract: A process and apparatus for preparing waste paper for reuse in a paper machine. Waste paper, water and de-inking chemicals are introduced to coarse pulping apparatus, and the coarsely pulped stock suspension is then thickened by filtration and treated in a reaction tower. The pulp is then thinned and passed through flotation apparatus to remove separated impurities, particularly printing inks. Water removed from the pulp in the thickening operation is passed through second flotation apparatus with the clean water therefrom being reintroduced to the apparatus.

Abstract: A variable capacity compressor for refrigeration systems such as air conditioners and heat pumps comprising an outer casing having a lubricant sump in the lower portion thereof, a crankcase internally spring mounted within the outer casing and having a pair of parallel, vertical crankshafts rotatably supported therein, wherein the crankshafts are arranged in side-by-side relationship, and at least two expansible chamber pumps, which may be piston, rotary or screw type, driven by the crankshafts. A pair of independently controlled electric motors have their rotors drivingly connected to the crankshafts, and in one embodiment of the invention, the motors have a common stator with two independently controlled sets of windings. In a further embodiment, two crankcases are provided, sharing a common lubricant sump.

Abstract: A scotch yoke radial compressor especially adapted for use in automotive airconditioners having a cast aluminum crankcase which is split along a plane axially passing through the center lines of the radially oriented cylinders. Each of the crankcase halves has a plurality of radially extending semicylindrical recesses which, when assembled, form the cylinders. Cylindrical cylinder liners are preassembled to the pistons and this assembly is then placed in one of the crankcase halves with the liners being received in their respective semicylindrical recesses. The second crankcase half is then secured to the first, again with the semi-cylindrical recesses overlying the cylinder liners. The distal ends of the liners are sealed by means of annular flanges which are clamped between the crankcase and the valve plate assemblies located at the ends of the cylinders.

Abstract: A venetian blind having a lift cord which through a linkage in the blind head controls an operating element for tilting the slats.

Abstract: The invention relates to a mechanism for adjusting the feed length of a rack and pinion roll feed mechanism of the type generally used for feeding strip stock into presses. The feed length adjusting mechanism comprises a hub member connected to the press shaft, a throw block connected to the hub, and a slide rotatably connected to the connecting rod of the rack and pinion drive for the feed. A slide is locked to the block by means of a piston and cylinder lock mechanism, and a lead screw is threadedly connected to the slide and rotated by a bidirectional pneumatic motor mounted to the block, whereby rotation of the lead screw causes the slide to translate within the slideway. This changes the length of the eccentric connection between the rotating block and connecting rod thereby proportionately changing its stroke and the amount of strip stock which is fed into the press during each cycle of the feed mechanism.

Abstract: A piston intended for use in refrigeration compressors and other applications wherein a heat barrier is provided in the piston skirt between the head of the piston and the wrist pin. The heat barrier substantially reduces the conduction of heat from the higher temperature piston head to the wrist pin bearing surfaces, which would otherwise result in rapid wear of the wrist pin bearings and ultimate failure of the compressor. The heat barrier preferably comprises a pair of openings extending through the wrist pin bosses in close proximity to the wrist pin holes thereby partially thermally isolating the wrist pin holes from the head of the piston. The openings are spaced on opposite sides of an axial line extending from the piston head to the wrist pin holes so that there remains a bridge of the piston skirt material to provide the necessary support for hydraulic loads that occur when the compressor slugs.