Abstract: A system for standardized printing of CRT screens is disclosed. A preferred embodiment utilizes a standardized photoexposure stencil made without the use of a shadow mask aperture pattern and projection printing. The stencil is then placed in proximity to the screening surface during exposure. Front panel and mask support topography preparation methods and apparatus are disclosed, as are means and methods for compensating for variations among panel assemblies utilized in standardized printing of the screens. The system thereby produces high resolution screens which may accept interchangeable shadow masks.

Abstract: A method of manufacturing CRT tubes with binary coded faceplates including dispensing a frit paste on the faceplate in the form of a bar code. The frit is devitrified as part of conventional faceplate processing either during normalizing or during devitrification of the mask rail frit without any additional steps. In one embodiment the frit is dispensed through a single dispensing nozzle and the nozzle is moved relative to the faceplate in x and y coordinates to form a single undulating line. In another embodiment, frit is selectively dispensed through a plurality of nozzles for each character pair to form either narrow bars or wide bars.

Abstract: A reusable factory fixture frame is disclosed for use in the manufacture of a color cathode ray tube having a flat faceplate and a tensed foil shadow mask. The frame provides for mounting an in-process shadow mask during photoexposure of an in-process faceplate in a lighthouse. The frame includes a generally rectangular frame structure having grooves thereabout for receiving an edge of the shadow mask. Quick-release mechanical spring clips are provided for temporarily and removably supporting the in-process shadow mask in tension in the grooves. The shadow mask is heated and allowed to expand prior to being temporarily and removably supported on the frame, and the shadow mask is allowed to cool and shrink in tension while so being supported to effect tensing of the shadow mask in clamped condition on the frame.

Abstract: A reusable factory fixture frame is disclosed for use in the manufacture of a color cathode ray tube having a flat faceplate and a tensed foil shadow mask. The frame provides for mounting an in-process shadow mask during photoexposure of an in-process faceplate in a lighthouse. The frame includes a generally rectangular frame structure having grooves thereabout for receiving an edge of the shadow mask. At least one elongatge rod-like member extending lengthwise of and complementarily mating with the grooves temporarily and removably support an in-process shadow mask in tension. The shadow mask is heated and allowed to expand prior to being temporarily and removably supported on the frame, and the shadow mask is allowed to cool and shrink in tension while so being supported to effect tensing of the shadow mask in clamped condition on the frame.

Abstract: An improved light collector for use in a touch panel device which has a plurality of substantially parallel light beams directed across a display surface thereof, which collector collects the light in the light beams and redirects it in a direction substantially perpendicular to the light beams for detection by a light detector positioned adjacent one end of the light collector. The collector comprises a multi-sided elongated strip of light transmissive material having a longitudinal axis, and being terminated by a light collection station. A plurality of longitudinally spaced light focusing elements are disposed along a first side of the strip. A like plurality of longitudinally spaced light redirecting elements, likewise disposed along the first side of the strip, are individually paired with an assigned one of the light focusing elements and each such redirecting element has a light intercepting surface having transverse dimensions small in comparison to the cross-sectional dimensions of the strip.

Abstract: An electrical switch includes an alternating series of first and second switch cells. Each first cell includes a first conductive member with a first bore and a first insulative member conformally located in the first bore and movable through the first bore. Each second cell includes a second insulative member with a second bore and a second conductive member conformally located in the second bore and movable through the second bore. The first and second bores have substantially the same cross-section. The cells are mounted end-to-end in the alternating series so that the bores align. Severable diaphragms electrically interconnect the second conductive member of each second cell to the first conductive member of the first cells adjacent to the second cell. The first insulative members and the second conductive members are simultaneously moved to simultaneously sever the diaphragms. A plurality of insulated gaps are thereby produced between the first and second conductive members of adjacent cells.

Abstract: A terminator device for a fusible element ribbon surrounding a switch in an interrupting module. The device is a conductive collar mountable to a terminal of the switch and an integral finger to which an end of the ribbon is attachable. One or more slotted tabs are also integral with the collar to engage and support fins holding the ribbon in a helix around the switch. The tabs may be deformed to lock the fins in place. The device, which may be a simple stamped part, thus mechanically and electrically mounts the ribbon and supports the fins, as well as electrically interconnecting the ribbon to the switch.

Abstract: A fusible element for a current-limiting fuse comprises a metal ribbon having groups of holes therethrough and therealong. The distance along the ribbon between adjacent holes in a group is less than the distance along between adjacent groups. The lateral width of the ribbon between the hole groups is greater than its laterial width where the holes are located. The ribbon initially melts at the holes and multiple arcs burn back the ribbon at a first rate until the ribbon containing the holes is consumed, following which merger of the arcs occurs. This merger and the greater width of the ribbon between the groups results in burn-back of the ribbon at a second reduced rate. In this way, both 9 kv and 15 kv fault currents may be interrupted without exceeding the spark-over voltage of phase-to-ground arrestors when 9 kv fault currents are interrupted.

Abstract: An improved switch in which a contact is moved away from a stationary contact by ignition of a power cartridge. The ignited power cartridge pressurizes a chamber defined by the stationary contact and an insulative trailer mounted to the movable contact to open the switch. The movable contact and its trailer move conformally through a bore of an insulative liner. The trailer and liner are made of ultra high molecular weight polyethylene which is abrasion-resistant and has high surface lubricity--thereby ensuring free movement of the movable contact and the liner--and which is non-brittle--thereby ensuring that forces applied to the trailer by the power cartridge do not shatter it. An inflexible disc of Lexan or Nylon may reside at the interface of the movable contact and the trailer to obviate extrusion of the trailer about the contact due to the forces applied to the trailer.

Abstract: A reusable control module mountable to a power-cartridge-operated interrupting module which includes a normally closed switch in shunt with a fuse. The control module houses a control circuit which ignites the power cartridge to open the switch. The control module includes two conductive shells threaded together to enclose the circuit, thereby providing a Faraday cage for the circuit and shielding the circuit from the environment. A current transformer is mounted in an exterior pocket in one of the shells over a mounting terminal thereon which extends out of the pocket to act as a single-turn primary for the transformer. The output of the transformer is connected to an input of the circuit. Circuit boards of the circuit are mounted within the shells, in part by a plastic plug, one end of which passes through one of the shells coaxially with a mounting neck. The other end of the plug has slots which engage and hold one edge of the boards. The plug contains a conductor connected to the output of the circuit.

Abstract: A brake and operation indicator for a movable contact of a switch, the movable contact being rapidly moved by ignition of a power cartridge to open the switch. A thin-walled sleeve is positioned conformally about a movable pin, a portion of which is lightly held in a bore of an end member of a housing for the switch. The sleeve is shorter than the distance between a head on the pin and the end member. The bore is normally closed by a thin membrane. When the contact is moved, it ultimately abuts the head, moving the pin through the membrane to a position beyond the end member where a portion of the pin is visible. Movement of the pin also collapses the sleeve between the head and the end member in accordion-like fashion to dissipate the kinetic energy of and stop the contact. The presence of the pin within the sleeve renders the collapse controlled, uniform, and efficient. The visible portion of the pin informs that the switch is open.

Abstract: A high-voltage circuit-interrupting device includes a replaceable container of pressurized arc-extinguishing fluid. A fluid port of the container is closed by a puncturable seal. When an overcurrent occurs in the circuit, the seal is punctured before interrupting contacts of the device open so that the fluid is already flowing when an arc forms between the contacts. Overcurrents are sensed by either a fusible element or a current transformer. Fluid flow before contact opening is achieved by mechanical facilities responsive to the melting of the fusible element or the output of the transformer. The entire device--including the container, the overcurrent sensor and the mechanical facilities--is at the voltage of the circuit.

Abstract: A fusible element of a current-limiting fuse has a plurality of hole groups with at least two holes in each group. Separation between adjacent holes within the group is substantially less than separation between adjacent groups. Accordingly, while fault currents driven by voltages at two different levels are effectively extinguished, the back voltage developed by the fuse during interruption of a fault current driven by the lower voltage is prevented from exceeding a selected value.

Abstract: An operating mechanism for enclosed high-voltage switches is movable in tracks attached to the side of an enclosure. In a test position, the mechanism is uncoupled from the switches and moved away therefrom to permit it and its control circuits to be exercised without operating the switches. In a maintenance position, the operating mechanism is moved further away from the switches to provide access for conducting maintenance. A latch automatically secures the mechanism in the test and maintenance positions. A lever on the outside of the enclosure selectively releases the mechanism from the test or maintenance positions permitting it to be reinserted or withdrawn further, and also indicates when the mechanism is in the test or maintenance positions. Normally, the lever does not permit complete withdrawal of the mechanism from the enclosure. A stop pin must be removed to permit sufficient lever operation for such complete withdrawal.

Abstract: Disclosed is an auxiliary mechanism for rapidly imparting rotational energy to electrical switch components. An insulator connects an electrical switch component to an output shaft mounted for rotation in the mechanism housing. A lever arm assembly is mounted on the shaft and a link member is pivotably connected between the lever arm assembly and a first arm extending from a bellcrank member. The bellcrank member is mounted for rotation in the housing and has a second arm that is operably connected to one or more solenoids. Initially the link member and first arm are in an overcenter toggle position so that the insulator cannot be accidentally rotated. Energization of the solenoid causes rapid rotation of the insulator because the mechanical advantage of the system in such that maximum force is applied initially.