Abstract: A power line transient surge suppressor circuit features a nonlinear surge-bypassing network connected to bypass line surges around electrical loads connected to circuit output terminals. A fuse is inserted in series with the network, and blows in the event of short-circuit failure of a regulator device in the network. A thermal cut-out preferably of the irreversibly actuated type is inserted in series with the suppressor circuit input. A current-limiting heater resistor connected in parallel with the fuse supplies heat to trip the cut-out after the fuse blows, thereby permanently terminating power output to the loads. A similar suppression network is provided for the earth lead in three-wire systems.

Abstract: A display assembly for posters or signs includes a cover frame having a clear sealed window at the front surface thereof. The display assembly is generally rectangular, the cover frame having four outwardly facing walls configured to slide into forwardly extending closely fitting walls extending from a one piece wall-mountable shroud-forming frame. Magnetic strips affixed to interior faces of the shroud-forming frame capture and hold an inserted cover frame, and the closely fitting shroud walls and immediately confronting cover frame walls serve to defeat the insertion of conventional tools to remove the cover when so emplaced. A special spatulate tool is configured with projections stressed to spring out of the plane of the blade in the relaxed state. The extensions are temporarily pressed flat during insertion, to spring outward when inserted to maximum depth into the assembly, the extensions when thus deployed confronting and engaging a rear portion of the cover frame.

Abstract: An improved mechanism having a housing defining a gas pressure sustaining chamber for an engine, compressor, or the like, including a double-acting movable partition within the chamber providing alternate expansion and compression of the chamber's sections on opposite sides thereof. The movable partition comprises two rectangular plates in end-abutting relation having their adjacent ends pivotally mounted on a rotatable crank pin on which they undergo limited pivotal motion with respect to each other. The outer ends and sides of the partition plate make a sealing, sliding engagement with adjacent walls of the chamber and the outer ends are constrained to undergo reciprocating motion along substantially parallel lines.

Abstract: A plug-in fuse assembly comprises a housing made of insulating material and having relatively closely spaced vertical side walls bridged by vertical end walls and a metal plug-in fuse element having laterally spaced, generally parallel confronting terminals at the bottom thereof projecting downwardly from the bottom of said housing and upwardly extending current-carrying extensions of said terminals and a unique S-shaped fuse link extending between said current-carrying extensions. The current-carrying extensions have upper vertical outer margins which are inwardly offset from a given point to the tops thereof with respect to the corresponding vertical outer margins of the plug-in fuse element below the same, to provide clearance spaces for the downward passage of the vertical end walls of the housing, so that the overall width of the fuse is not significantly increased, if at all, by the housing end walls.

Abstract: A wireless subscription television system arranged to transmit ciphered video signals from a transmitter to receivers in which the transmitting system comprises an enable code setting means, a transmitting means for transmitting control signals to allow a respective enable code of a receiving system to be picked up and a converting means for masking said enable codes and sending out masked enable codes, and on the other hand, the receiving system has a plurality of decoder systems each comprising a key code input means, a means for picking up a key code put in by the input means after converting it into an enable code by means of the control signals and a comparator means for determining if the picked-up enable code and the enable code as masked sent from the transmitting system are same or not. Thus, when the both enable codes come to be same, the respective decoder system is set in receivable condition.

Abstract: A tester for telephones and telephone answering systems features a dialing test capability for high speed dialing systems by providing the dialed digits in a single display element serially in time at a delayed rate set by strobing the digits from a memory storage element. A two-level ringing signal is provided to test for marginal telephone bell sensitivity. Means are further provided for reversing the emulation of the central office battery polarity so as to test for diode failure in electronic telephones. A simple cord circuit test for open- and short-circuit in the wall and handset cords, and moreover provides for detection of connector wiring reversal. Precision long-duration ringing burst capability is provided, along with ringback, dial tone, cut-out, and two-way communication between a telephone answering system under tests and a supplemental telephone as to provide for complete testing of the various phases of actuation of automatic answering systems.

Abstract: A manual rotary-shear cutter for severing sheet metal stock has a cutting head and a handle joined by an extension tube engageable with and selectively retained at sites formed on the cutting head and handle. A series of preformed apertures spaced along the extension tube allows shortening of the overall length of the cutter by severing the extension tube and aligning the apertures nearest the end of the extension tube with passages formed at such sites, inserting fasteners therethrough, and releasably securing such fasteners. A connecting sleeve may also be provided to join individual extension tube segments, thereby forming a longer extension. Flanges formed integrally with the head define mounting sites for the cutting blades, and overlap the blade edges, to protect the cutting edges of the blades.

Abstract: A bore examining apparatus comprises an article support, a reflector support on one side of the article support, a microscope body or other magnifying means on the other side of the article support, and a reflector mountable on the reflector support. The reflector is configured with a convex reflecting surface forming a solid of revolution about an axis coaxial with respect to the longitudinal axis of the bore being examined, the reflector facing the through hole when supported on the reflector support, so that the reflected image of the bore is directed towards the microscope and produces therein a 360.degree. panoramic view of the interior walls of the bore. The article support means is movable relative to the reflector support and magnifying means so as to move the viewing field along the bore.

Abstract: An improved cartridge fuse has resilient plugs at opposite ends of the fuse housing through which extend a centered fuse filament held in tension by the defining walls of a plug passage hugging the fuse filament to maintain such tension. The fuse filament is placed in the plug passages by means of a needle which is passed through the fuse housing and the plugs therein to create a path for the fuse filament which, when the needle is pulled from the housing, leaves the fuse filament in a tensed centered condition in the fuse housing.

Abstract: A miniature fuse suitable for printed circuit applications and a manufacturing method therefor features preferably a generally rectangular elongated insulating body having a fuse element preferably diagonally disposed in a fuse cavity therein and terminals preferably insert molded therein and extending preferably from the opposite ends thereof. The cavity preferably opens onto opposite longitudinal sides of the body, but provision may be made to optionally close-off one of the cavity openings by a cover plate. The body is sealed by a sleeve which is preferably a semi-rigid expandable member but which could be a piece of expandable shrink tubing. Lay-in grooves preferably extend from the opposite ends of the cavity to conductive fuse attachment surfaces which are initially preferably bendable tabs located beyond the outer surface of the body to allow the fuse element to be conveniently attached or captured thereby during fuse assembly.

Abstract: A cadmium electrode for a rechargeable alkaline cell comprises a rigid substrate having particle-receiving recesses therein into and upon which are pressed a particulate mix of binder coated cadmium oxide particles and cadmium particles which constitute an active precharge anti-fading constituent of the mix. The binder coating may be a substantially insulating material, in which case the cadmium particles in various places are pressed into the substrate so that they penetrate through the binder coating to make direct contact with the cadmium oxide particles. The binder is most advantageously a curable butadiene polymer binder coating on the cadmium oxide particles preferably formed by heating an initial slurry of an emulsion of the binder and cadmium oxide particles to vaporize the liquid carrier and at least partially cure the binder material.

Abstract: The tape player includes a control plate movable in response to insertion of a fast-forwarding or rewinding operation lever, an idler gear plate carrying a play mode idler gear, a changeover lever carrying a fast-forwarding and rewinding mode lever, and an interlock means interlocking the idler gear plate with the changeover lever and responsive to movement of the control plate to keep only one of the idler gear plate and the changeover lever at a neutral position where the associated idler gear is away from reel bases.

Abstract: A pitch modification system for signals received from a tape player converts analog signals received from the player to binary digital form and stores them in sequential addresses in a memory unit at a rate set by a first clock. Output signals are produced by sequentially reading the stored information at a different rate as set by the frequency of a second clock, the ratio between the two clock frequencies causing the desired change in pitch with respect to the original signal. The output signal is converted from digital binary representation to an analog signal by a D/A converter. A detecting means is employed to detect no-signal conditions and generates an automatic reset signal which equalizes the two clock frequencies to restore the system to a zero-shift condition attendant to the appearance of silent passages on the tape.

Abstract: A time delay fuse comprises an initially open end insulating housing having conductive terminals at the opposite ends thereof, a current-heatable strip connected to one of said terminals, a thermal mass in heat communication with the current-heatable strip and a coil spring and current shunt strip electrically coupled between the current-heatable strip and the other terminal to complete a circuit between the terminals. A heat meltable solder connection is located between said thermal mass and the coil spring and current shunt strip, the spring and current shunt strip being spring urged away from the thermal mass so that upon the melting of the heat meltable solder connection the coil spring and current shunt strip will be pulled away from the thermal mass to break the physical and electrical connection of the coil spring and current shunt strip with the current-heatable strip.

Abstract: A panel-mounted fuseholder unit for accepting fuses is provided with integral snap-in mounting means for securely engaging the panel in regions peripheral to a panel mounting aperture when mounted preferably from the rear of the panel so that the fuseholder can be pre-attached to a wire harness. Complementary preferably latched side-engaging means allow an interlocked side-by-side array of fuseholder units to be fabricated and panel mounted by their individual mounting means. The side engaging means are disposed sufficiently away from the engaged panel so that no special contouring of the aperture is necessary to provide clearance.

Abstract: A cigarette holder has internal valving means for providing with each inhalation by the smoker an initial supply of substantially smoke-free air, followed by a vacuum actuated changeover to supply smoke directly from the cigarette without dilution. The initial precursor of substantially smoke-free air has a minimizing effect on the irritating properties of the inhaled cigarette smoke. An alternative embodiment incorporates the valving means directly into the end of the cigarette during manufacture.

Abstract: A slow blow fuse of the shunt type includes a pair of spaced terminals between which is connected and suspended a fuse wire assembly including a core of insulating material having at least a pair of fuse filaments upon the same, the outer of which is preferably an untinned spirally wound filament wrapped a number of times around one and more preferably at least two straight filaments, only one of which is tin plated, extending axially along the core. The uncoated spirally wound filament thus makes repeated physical and axial spaced electrical contact with the tinned filament. There are thus at least two fuse filaments in electrical parallel relation at a number of different locations therealong, each sharing a layer of tin coating.

Abstract: A film speed correction circuit for electrically controlled cameras having aperture or shutter speed controlled responsively to ambient light sensings from a photosensor features a controllable multi-stage amplifier preferably interposed between the photosensor and the aperture or shutter control means. The amplifier features a plurality of cascaded stages, each stage being operated to two different gain values according to a sensing signal provided thereto, the sensing signals for each stage being derived from coded insulating and conducting areas on the outer surface of the film cassette. Use of active stages interposed between passive attenuating stages substantially eliminates interstage loading and allows the use of standard resistance values to provided proper gain values for each stage.

Abstract: An electrically operated flash camera employs an infrared pre-flash reflected light signal stored in a single memory storage to control focus and aperture. Two comparators serve to govern both operations, sensing potentiometrically derived analog position indicating signals representing lens position and aperture setting as the lens and aperture control elements are scanningly driven through their ranges of settings. Comparison of these analog signals with the stored signal is used to terminate scanning to set focus and aperture. A visible light photosensing means controls aperture and inhibits the exposure flash if ambient illumination is adequate.

Abstract: A fuse holder includes a fuse carrier insertable into a passageway in a fuse holder body mountable in a vertical panel opening. The fuse carrier supports an active fuse in a U-shaped recess loosely holding the fuse in a horizontal position extending parallel to the panel. The fuse holder body includes a shoulder adjacent the front end thereof for preventing the complete withdrawal of the fuse carrier from said fuse holder body when the fuse carrier is pulled to the front of the body. The fuse carrier has pivot pins for pivotally engaging this shoulder so that the carrier drops into a position where it hangs downwardly from said fuse holder body where a fuse releasably held on the carrier is exposed for removal. The fuse holder body and fuse carrier have releasable interlocking parts which become interlocked when the fuse carrier has been pushed into a fully retracted position within the fuse holder body where the fuse terminals engage with terminal clips.