Abstract: A line circuit for providing line control between a central office or PBX line and the key telephone station subscriber instruments. The line circuit responds to ring currents to activate suitable signalling at stations having access to the called line. The circuit responds to a station going off-hook following ringing to provide the well-known responses. Call holding is also controlled by the line circuit. Within the circuit, the ring response is activated by a capacitor, the same capacitor being used to time out and terminate ring on a failure to respond and also to time the release of the circuit from the central office line.

Abstract: A telephone-type ringer assembly with an improved volume control operable from the exterior of the closed housing in which the ringer is contained. The volume control comprises an eccentric control wheel for one gong to settably vary the distance from the striker to one gong. The setting of the gong is controlled by a detent pivoting the control wheel with the detent position being controlled by a rod having an eccentric connection to a setting control on the housing exterior or directly through a suitable slot in the base which does not require the rod and attached lever.The ringer is designed to be mounted to the base directly on bosses molded onto the ringer frame. This mounting alternatively allows a detent spring extension to project through the bottom of the base for direct control, eliminating the need for a linkage.

Abstract: Conference circuit which uses a read/write memory divided into groups of memory lines, with each group corresponding to a conference. Each line is assigned to store data from a single subscriber and to store the code words coming from that subscriber. The memory stores non-linear subscribers' codes. The codes are expanded and the codes of other subscribers in the same conference are added and compressed for transmission and decoding at any other exchange of other conference members. The conference circuit may be inserted in one position of a group of junction circuits or may be placed in a subscriber line concentrator.

Abstract: A switching network is disclosed which employs a simplified distributing frame to interconnect line selection units and group selection units. An intergroup trunking formula using multibit designations for each terminal is employed as a guide in forming the distributing frame. The system permits intermediate access to the network at the link-terminals by way of loop circuits coupled to the distributing frame. The use of distributing frame according to the invention enables the use of plug-in modular wiring.

Abstract: A system is disclosed for sharing the work load of incoming calls between two computers. The system employs memories recording the total number of calls to be processed and the number to be processed by a particular one of the two computers in a given time period. The first calls received are sent to the one computer. When the number of calls actually processed by the one computer has been received the following calls are sent to the second computer to be processed. When the total number to be processed is actually reached, the system is reset to its initial state and the cycle is repeated.

Abstract: A toll restrictor is disclosed for use with a time division multiplex telephone switching system. The restrictor disclosed may serve an entire exchange, the restrictor having digit storage capability for each time slot used. The restrictor is capable of refusing or accepting a first digit and as many as six additional digits in the form of codes. Decisions by the restrictor are made on the basis of conditions programmed within the restrictor apparatus. Calls are completed or not depending on the decisions of the restrictor.

Abstract: Disclosed is a wholly electronic system for either testing or changing the state of a bi-stable circuit element such as a crosspoint of a switching matrix under the control of a central processor (CPU). A maximum of 256 groups of 128 points may either have the condition changed (driven) or the condition read (scan) by the apparatus shown under the control of a processor such as a 16-bit CPU. Interfacing between the CPU and the switching matrix is a bi-directional multiplex gating and decoding tree network having at its outer extremities the points. Each point is represented by an address comprised of bits representing word, basket, group and level. By addressing a point and then providing a control indication as to whether the condition of a point is to be read or whether the condition of a point or group of points is to be changed, the points can be readily scanned or driven according to instructions received from the CPU through a logic unit or controller.

Abstract: Disclosed is an outdoor luminaire employing as its external lens, panels of one-way reflecting glass. During the day, or with the interior lamp unlit, the panels provide an opaque outer surface reflective of the surroundings. With the lamp lit, the panels act merely as lenses passing the light emitted by the interior lamp. In order to make the luminaire opaque, diagonal baffles are provided to extend from each corner of the luminaire toward the lamp and lamp prismatic refractor. These baffles tend to produce four separate compartments with opaque interior walls to prevent the lamp and internal components from being visible when the lamp is unlit. By making the baffles reflective, a further enhancement of the internal masking is effected while further enhancing the optical characteristics of the luminaire when lit.

Abstract: A short circuit detector is provided for a compact power supply system in which a plurality of power supplies may be operated in parallel. The detector senses when a voltage drop in a bus indicates a possible short and then energizes solid state devices to turn the system off for a prescribed period of time. After the prescribed period of time has passed, the system will attempt to restart. If the ground has been cleared, system operation will be restored. If not, the system will again be shut down for the prescribed period.

Abstract: Within a key telephone system, there is provided a circuit for completing a direct signalling path from a first station to another station in the system. By depressing a button at the first station designated with identifying indicia of the other station, a direct speaking connection is made from the first station to the other station. The first station may be an attendant's position with direct key appearance for each station to which the attendant is to have direct access. In a preferred form, the called station has a loudspeaker associated with the station instrument. In this instance, a direct call results in a signalling tone directed to the loudspeaker, following which the attendant can converse with the speaker-equipped station. With an attendant's position, depression of a direct station key automatically places a line to which the attendant had been connected on hold.

Abstract: Disclosed is a feature for use in a subscriber digital multiplexer interfacing between a central telecommunications office (CO) and a plurality of remote terminals, each remote terminal serving a number of subscribers. Calls from and to lines at the same remote terminal are identified over a special network at the central office for the purpose of by-passing the speech channels to the central office and thereby freeing the central office equipment and two channels for use in processing other calls. The special network or intra link network is activated after the called station has responded to a call. First, a check is made to see whether a station at the same remote terminal has originated a call. A tone is then sent out over the line to determine whether the call originated and terminated at the same remote terminal. If both lines are from the same remote terminal, the call is transferred from the speech channels to intra link channels as controlled at the central office over signalling channels.

Abstract: An apparatus for selectively positioning an automotive vehicle seat is disclosed. The apparatus is adapted to be powered by an electric motor drive, such as a motor with multiple armatures or by using separate motors or by using clutch activated members driven by a single motor. Output of the motor drive is transmitted through respective gearing to lead screws within tracking structures at both sides of the seat to translate the seat horizontally. The motor drive output is also transmitted to operate individual lead screws for the vertical seat movements. To provide elevational movement of the front and rear ends of the seat, separate mechanisms from the motor drive to front and rear end lead screws are provided, these mechanisms being distributed along the seat width. These lead screws cause rotation of respective individual torsion bars at the respective front and rear ends of the seat. By the construction shown, rotation of a torsion bar raises or lowers the respective seat end.

Abstract: A turn signal mechanism which is configured in a pie-shaped modular segment adapted to mount into the steering column of an automotive vehicle from one side thereof. The mechanism may be removed radially from the steering column for replacement or repair without the necessity for removing other steering column components. All the operative components are mounted in a modular housing which is affixed on one side of the steering shaft and requires no disruption of the shaft for removal and replacement of the module.

Abstract: Tubular discharge bodies are provided for sanitary flow fittings. The discharge bodies are provided with an annular fitted element which may be placed in two settings or removed to enable three different pivoting ranges of 0.degree., 90.degree. or 360.degree..

Abstract: An intercommunication link for a multiple link key telephone system with a combination lamp-button on each handset for each available link. In each link, a line seeking intercom service is sensed to operate a relay in the link selected. A lamp flash signal on the lamp of the selected link is initiated. In this condition, all other links are disabled and none can be accessed when one link is in the lamp flashing condition. The called local number of the desired intercom station is dialed and when the called station line is answered, a second relay in the selected link operates to release the first relay. On operation of the second relay, a steady lamp indication is sent to both stations in the conversation. Other free links may be accessed at this time. Thus, only during this intercom signaling phase are the remaining free links affected.

Abstract: A space division switching network having a plurality of stages is disclosed for use as part of a time-space-time division switching system. The network employs MOS technology with standard printed circuit boards enabling very compact assembly. To enable a maximum number of stages to be placed on a standard board with appropriate electrical connections to each stage over the standard number of terminals, addresses of crosspoints are supplied in parallel over common address conductors and the appropriate stage is then switched through an enable signal.

Abstract: A digital multiplexer for transmitting control, signaling and speech information in digital form between a central telecommunications office (CO) and a plurality of remote terminals. The system serves a plurality of lines at the exchange and couples those lines to subscriber stations associated with those lines through a digital span line such as the generally known Tl line between a CO terminal and the remote terminals. A maximum of 32 channels are provided using continuously variable slope delta modulation, with the modulation and demodulation being performed in line circuits individual to each line being served. A time division concentration stage enables the system to service 128 lines over the 32 channels with each channel having a memory position for storage of line address information.

Abstract: A wiring harness in the form of a sandwich of insulating sheets is formed by automatic means. The sheets are held together by adhesive and enclose an inner layer of conductors. Openings through the walls of the insulating sheets provide access to the conductors for external wiring. Spacing is provided along the edge of at least one insulating sheet to enable flattened ends of the inner layer of conductors to protrude as terminals available for connection to additional external wiring.

Abstract: Disclosed is an arrangement of circuits for providing what is normally called Custom Calling or Special Services features such as signalling and switching for a call waiting or three-way calling. The apparatus shown may provide either feature or may provide both services by the selection and insertion of one of three available circuits. A plurality of common circuits are provided to operate with specific electronic logic circuits for call waiting, three-way calling or both. Circuits are plug-in PC boards using integrated circuit logic. Individual plug-in cards are provided--one for the call waiting feature, another for three-way calling and a third card is used to provide both features. The entire apparatus may be connected to the subscriber lines and to the central office equipment at the main distributing frame thereby requiring no internal wiring or circuit changes in the central office.

Abstract: Disclosed is a line circuit providing the normal line circuit functions and key system control functions within an exchange using time division switching. The line circuit may be used interchangeably for key telephones or non-key telephones. In the former case, the circuit provides the well-known key telephone features for multiple line access at each station of a plurality of stations. Each line circuit provides electronic signalling controls, such as lamp flash indicating a call awaiting an answer, lamp wink indicating a line is on a hold condition, and the fully lit line busy indication, together with audible controls for a called line, and also provides an inverted flash signal at the line circuit for trouble or problem situations.