Abstract: A microphone, particularly for hearing aid application, said microphone providing a stepped response characteristic relative to frequency wherein low frequency sounds will couple to the associated hearing aid with a restricted amount of amplification, while providing an emphasis or higher amplification for the higher frequencies in the bandwidth of interest.

Abstract: In a camera adapted to receive a disc-shaped magazine and including a housing with front and rear walls having a lens window exposed on the front wall near one side margin of the housing and front and rear viewfinder windows exposed on the front and rear walls on the same side of the housing as the lens window, a hollow handle is provided having spaced front and rear walls defining therebetween an open housing side-receiving recess. The handle is much narrower than the width of the housing so as to fit over only the side of the housing containing the lens and viewfinder windows.

Abstract: An operation lever mechanism for a tape player which comprises an array of operation levers including a play-operation lever for advancing a head plate alone, a stop-operation lever for retiring the head plate, a fast forward-operation lever and a rewind-operation lever, engaging portions provided on the operation levers, respectively; an operating member provided between the operation levers and adapted to be operated, upon depression of any one of the operation levers, through engagement thereof with the depressed operation lever to lock said lever in the depressed position and restore the operation lever adjacent said depressed lever which has been depressed previously; an interlocking member provided in association with the stop-operation lever for an ejecting operation and formed with a projected portion engageable with a salient portion of said stop-operation lever, said operating member having an operation portion for displacing the projected portion of the interlocking member out of the actuation area

Abstract: A disc camera advances a film disc by an oscillating pawl engaging the disc film notches previously used for indexing. The pawl is carried on a member pivotably mounted on the side of the rear film chamber wall remote from the chamber and passing through an opening in this wall. The limits of movement of this member are determined by the height of a lobe of a rotating cam driving the pawl system and by other mechanical limit stops. An end-of-film sensing pin is provided which passes through the rear film chamber wall of the camera and engages the face of the film disc hub directly. When the pin drops into the film disc hub, the film advance motor circuit is rendered inoperative. A single printed circuit board placed near and parallel to the side of the film chamber wall remote from the film chamber carries the DC motor, shutter-cocking and the pawl-oscillating mechanism. The pawl carrying member is pivoted on this wall.

Abstract: A process for providing water based anionic polyurethanes having improved thermal oxidation color stability. Water dispersed amine salts of anionic prepolymers prepared from the reaction of polyhydroxy compounds and dihydroxy carboxylic acids with diisocyanates are chain-extended with hydrazine or hydrazide and thereafter optionally with a diamine, when cured at temperatures in excess of 150.degree. C., form polyurethane products having substantially no discoloration and good mechanical properties. Alternately, the hydrazide may be employed as an additive rather than as a chain-extender. The process is particularly useful when employing cross-linking agents which react only at high temperatures.

Abstract: A spiral wound fuse body comprises a core of insulating material formed by a limp, dead yarn made of twisted together initially sizing-coated strands of fine ceramic filaments, where the sizing was subsequently removed so that there is no sizing to leave a conductive residue under fuse blowing conditions. Such a fuse body is mass produced by spiral winding fuse wire upon a continuous length of said yarn unwinding from a spool upon which the yarn was wound when the sizing was removed. The resulting self-supporting body can be wound into rolls and subsequently unwound so that individual fuse bodies can be severed from the end of the unwinding roll of fuse body-forming material.

Abstract: An electrical controller, such as a controller timer for a home lighting circut, is connected so that a power switch like a triac controlled thereby replaces a conventional toggle switch operating in conjunction with another toggle switch in series therewith which can operate the controller. The timer is continuously coupled to the AC power system by permanent connections between the movable pole of the remaining toggle switch station and the load terminal of the triac of the controller and the power system. A stationary contact of the switch forms a control signal terminal which extends to a control input terminal of the controller. The controller may also include a depressible pushbutton or other on-off control switch which when successively operated generates pulses which toggle a control circuit to alternately render the triac conductive and non-conductive, and to program a controller-timer.

Abstract: Sheet feeding apparatus comprises longitudinally and laterally adjustable stacking members for retaining on a support tray one or more stacks of sheets to be fed from a feed opening exposing an end portion of the bottom sheet. Flexible spring lips form an adjustable width support ledge at the front of the feed opening which supports the front end of each stack of sheets. About 8 or more relatively closely spaced suction cups, encompassing the length of the feed opening and preferably supported on the top of a pneumatic tube, are raised with the tube to engage the bottom-most sheet in the stack. The pneumatic tube is mounted for pivotal movement upon a rockable carrier framework. The tube inclination and position relative to the sheet engaged by the suction cups are varied in a manner to ensure reliable removal of only one sheet at a time by the suction cups which pull the sheet with a wiping contact against the deflected ledge-forming spring lips.

Abstract: Fluid handling mechanism has a vane with parallel side edges coupled to a crank at one end and to an obliquely transverse guide track at the other end. The vane is closely runningly fitted, between parallel side walls and curved top and bottom walls, executing a longitudinally moving line contact with the curved walls in conjunction with irrotational, purely linear, fluid flow. This contact may range from zero to a substantial clearance. Flow is combined fluidynamic fan effect and positive displacement. The positive displacement portion is increased when two such mechanisms are assembled tandemly, in series, with the vanes piano-hinged together. The four walls form a duct, the ends of which may be ported or valved. The duct may also be closed at its ends to constitute a chamber, allowing the mechanism to serve as a closed cycle regenerative gas engine.

Abstract: A process for making a mixed product of dimethyltin dichloride and methyltin trichloride by reacting dimethyltin dichloride with stannic chloride without catalyst. The mixed product is useful as an intermediate, without further purification, in the preparation of corresponding mercaptide stabilizer for vinyl chloride polymers.

Abstract: A fuse holder clip for snap-in insertion into a parallel array fuse holder block features a terminal lug configured in the form of a right-angle strap of length such as to allow mechanical and electrical engagement to a similarly configured adjacent clip disposed along one side of the array. Complementary engaging means, preferably in the form of a hollow rivet at the right-angle bend of the strap, and a matching hole at the outboard end of the strap permits riveting engagement of an arbitrary number of such clips, whereby such clips become electrically interconnected by a common bus. The snap-in feature of the clips permits removal and reconfiguration of terminal groupings along a given edge of the fuse block at will. Use of the hollow rivet facilitates high current lead attachment to the bus by an eyelet lead lug and a self-tapping screw.

Abstract: An acoustical panel construction which, in its preferred form, comprises a preformed body portion or shell, the outwardly extending edges of which are formed of thin, but dense, acoustical material. The density, thickness and configuration of the edges provides the necessary rigidity and structural strength to enable a panel formed from the body portion or shell to be properly edge supported on, and conform to, a grid system. The body portion or shell advantageously is formed with a central area of acoustical material which is thicker, but less dense than the edge areas, to enhance the acoustical properties of the finished panel. The body portion or shell is adapted to receive a sheet or layer of an acoustical material having a preselected density and thickness such that the finished panel will be able to meet the sound absorption and resistance to fire, among other demands, of the environment in which the panel is installed.

Abstract: In a magnetic tape recording/playing device, a reel base driving mechanism wherein a pulley driven by an electric motor and a reel drive block are fitted rotatably independently of each other to a shaft of each of forward- and reverse-side reel bases, while an idler is movably provided between said reel bases, which idler having an input section or idler which engages said pulleys and an output section or idler which engages said reel drive blocks, said idler being made to engage the forward- or reverse-side reel base, thus transmitting the rotation of the pulley on that reel base to the reel drive block also on this reel base.

Abstract: This invention relates to the key case that is adapted to be attached to a fixed location on or adjacent a door that is attached to a casing by hinges and has a lock openable with a key. The key case has a sleeve for receiving the conventional hinge pin of an interleaved hinge so that the key case is located in a readily locatable position with respect to the door. The key case has a retracting mechanism with a flexible member attached thereto and the key attached to the free end thereof. Stop means are located within the key case and define a stored position for the key wherein a portion extends through an opening in the case to be gripped by a user and retracted and moved to the lock. The retracting mechanism automatically returns the key to the stored position whenever it is dropped or released.

Abstract: A process for preparing a 2-aralkyl-5,5-dialkyl-1,3,2-dioxaphosphorinan-2-one by heating a 2-aralkyloxy-5,5-dialkyl-1,3,2-dioxaphosphorinane such as the novel 2-benzyloxy-5,5-dimethyl-1,3,2-dioxaphosphorinane, with a catalytic quantity of an aralkyl halide. The aralkyl halide can be recovered and recycled.

Abstract: A free flowing antistatic composition is provided in a solid particulate form for use with polymeric materials. The composition is a flowable mixture of predominantly C.sub.18 alkyl ethoxylated primary amine particulates with micron sized silica gel particulates. The composition of the present invention is particularly useful with food packaging polyolefin materials.

Abstract: Ovenable board comprising a paperboard or the like, base material having a coating of polyvinyl alcohol and a silicone. The ovenable board is especially adapted for use in packaging pre-prepared food products such as pizza and bakery goods.

Abstract: An electrically driven automatic film advance camera with automatic transition to rewind without external actuation is described. Film advance after each exposure occurs automatically after release of the shutter actuating button by means of an integral electric drive motor preferably contained within the film take-up spool. The end of film condition during film advance is signalled by a sudden onset in film tension, which actuates a switching system to reverse motor drive polarity and power the motor until the film is completely rewound into the cassette, whereupon motor actuation ceases. A take-up spool gear drive train remains fully engaged at all times. During the rewind operation both the take-up spool and the drive spool are driven simultaneously by the drive motor to facilitate film disengagement. A film engaging sprocket serves to govern film advance for framing purposes, the sprocket being principally in an idling state throughout the film advance operation.

Abstract: A simplified apparatus for centering and spreading laundry articles on the conveyor of a machine automatically feeding such articles to a commercial laundry iron and comprising lead and trailing carriages having clipping apparatus for gripping adjacent corners of such articles, a track to convey the carriages, a belt driven by a motor for moving the carriages on the track. The lead carriage is directly affixed to the first run of the belt, the trailing carriage idles with respect to the second run of the belt. Upon activation of the motor, the lead carriage moves down the track drawing the laundry article along the front of the inlet end of the conveyor. An abutment affixed on the second run of the belt contacts the trailing carriage creating tension in the leading edge of the laundry article. Movement of the abutment with respect to the second run of the belt is made adjustable so that the position of the line about which the articles are centered may be varied.

Abstract: A loading station located at one side of a feeding conveyor, into which the corners of a sheet can be loaded. The station comprises two movable clamping devices supported on a track which runs across the rear of the feeding conveyor. Each clamping device is driven by an independent transmission system, the two transmission systems are connected to a selfcentering interlock mechanism. The centering mechanism is arranged to permit independent movement of the two clamping mechanisms, whereby they can move from the side position into a position in front of the feeding conveyor. The centering mechanism will then automatically control the tensioning and positioning of the leading edge of the sheet which is held by the clamping devices irrespective of the width of the sheet.This will result in the center of the sheet being positioned in line with the required feeding center of the feed conveyor.