Abstract: A line circuit for a key telephone system using three relays, a line relay, a ring relay and a combined off-hook and hold relay. To control the energization of the ring relay and the off-hook and hold relay responsive to inputs from the exchange or from a station of the line, an operational amplifier network is used. Two amplifiers are used as individual relay drivers and two are used as comparators. The amplifiers of this network may be identical circuits as part of a quad circuit chip. On a ring signal from the exchange, a ring comparator amplifier is activated to energize the ring relay. On a station of the line going off-hook, the off-hook driver amplifier is activated directly to energize its relay. When a station of the line goes into hold, the off-hook and the hold comparator amplifier is activated to energize both the ring relay and the off-hook relay. The line relay is energized during only the ring and hold conditions, and is shunted against energization during the off-hook condition.

Abstract: Apparatus within a time division multiplex telecommunications system for terminating local traffic at a local distributing center and eliminating the need for use of channels to the switching center. The system employs time slots for calls to the switching center and other time slots for local calls. Digits representing the called line are stored in a register at the calling station. The register is interrogated after sufficient digits have been stored to inidicate the destination as local or switching center. When a local call is recognized, a bistable in the local distributing center is set. When the end of dialing signal is received, a code is generated to release the channel connection to the main exchange and to complete the call locally over time slots dedicated to serving local calls.

Abstract: A system is disclosed for safeguarding data against slip in signals occurring in interfaces between exchanges employing different exchange clock rates. Suitably connected storage arrangements cause the instants of slip compensation in both directions of transmission to coincide. In this way, omission of a signal in one direction of transmission results in a signal being inserted in the other direction and prevents the loss of data.

Abstract: A time-space-time division switching network for transmitting multiplexed signals. A speech memory is associated with each incoming time switch for the first stage and with each outgoing time switch for the final stage. The intermediate space switching stage has plural parallel planes which are independent of one another and each plane is capable of transmitting messages in serial form. The memories allow regrouping of messages from parallel planes into serial form for output over a single multiplex line.

Abstract: Disclosed are a rotor and a method for manufacturing a rotor for vane-type engines. The rotor includes radial slots which guide vanes extending from spring chambers within the rotor. In the practice of the method: (a) radial bores are provided in rotors to receive springs and serve as spring chambers, (b) longitudinal bores are formed in the rotors parallel to the rotor axes and intersecting the radial bores, (c) springs are placed in the spring chambers (radial bores) to extend into the longitudinal bores, (d) the radial bores are partially closed on the outside by plastic deformation of the rotor material, and (e) radial slots are formed parallel to the rotor axes to intersect the radial bores and permit vanes to extend therethrough.

Abstract: Disclosed is a device for facilitating the calibration and setting of the inclination angle of a luminaire by sighting from the rear of the luminaire to a set of points such as the opposite curb of a roadway. The device may be placed on or permanently secured to the luminaire and is settable according to a derived calibrated table, either empirically derived or calculated, based on such factors as pole height, distance of pole from highway, width of the roadway, and the like.

Abstract: Disclosed is a digital modem using continuously variable sloped delta modulation and adapted for digitizing voice signals in a telephone system. In the analog to digital direction (A/D), an analog input signal is converted into a digital output, the output logic condition being indicative of the direction of change in amplitude from the last signal input. The signal pulse indicating positive change or absence of pulse indicating negative change is passed to a shift register for transmission of the first pulse signal and storage of a plurality of bits. A feedback network receives the pulse bits from the shift register, and the bits are converted to a summed signal for resolution into a reconstructed or simulated signal against which the incoming signal is checked. For the receiving or D/A direction, a somewhat similar circuit in reverse is used to reconstruct an analog signal from the received data bits.

Abstract: Disclosed is a swivel mounting structure for a video-telephone unit. The mounting structure allows the unit to be readily rotated and inclined or be moved with a combination of both movements. The structure will maintain the unit in the position to which it is set by either the friction provided by mechanical locking members or by having the center of gravity of the unit positioned above the center of a pair of spaced rocker members riding within a cylindrical opening.

Abstract: A production line for mechanically assembling pistons into cylinders of an internal combustion engine block and for automatically mounting the split bearing for each piston connecting rod to the crankshaft of the engine. At one end of the line, the engine block is laid on end with the piston cylinders extending horizontally. A magazine with a generally cylindrical sleeve in alignment with each cylinder bore in the engine is supplied with pistons complete with connecting rods. The connecting rods are positioned facing the top of the engine block. A split bearing end cap for each piston is placed in suitable holders on the sides of the magazine. At one station of the line, a ram automatically pushes one or two pistons into the engine block. A nesting receiver is positioned to receive the end of a connecting rod and guide the bearing end of the rod onto the crankshaft. Thereafter the bottom split bearing end cap is carried to the crankshaft for connection to the top end cap of the connecting rod.

Abstract: Disclosed is a selectable position adjusting or setting mechanism for a seat for automotive vehicles using an electric motor with multiple armatures or by using separate motors. Action of the motor is transmitted through respective drives to lead screws to translate the seat horizontally, to raise or lower the front end of the seat and to lower or raise the rear end of the seat. The motor action is transmitted to three parallel lead screws to drive these individual lead screws and result in three types of seat movement. To provide speed for the horizontal movement, a lead screw having a very high lead or pitch is used. In addition, the operative members of the mechanism are mounted compactly providing a comparatively short, low profile design.

Abstract: An electric power distribution system for automotive vehicles is disclosed. The system employs a bus bar which is connected to an electric power source and positioned within the vehicle in such a way as to provide a ready source of power near each power consuming device. Power control switches are coupled to control power transmission over relatively heavy conductors between the bus bar and each power consuming device. Light weight conductors are connected to the power control switches or power controllers to operate them in response to control signals provided over additional switch devices such as manually operated switches on the dashboard of the vehicle.

Abstract: Disclosed is a rotary dial with improved mounting arrangements for assembling the dial and for securing the dial within a telephone instrument. A rotary dial using the present construction features allows one common dial base to be mounted in a number of different housing configurations. The common dial base is fabricated of molded high impact plastic into which mounting members using the present design may be snap-fitted. By providing snap-in mounting members in a plurality of slightly different configurations, the same dial may fit within a plurality of dial housings. As a further part of the improved mounting structure, an easily mountable locking ring is employed to cooperate with the dial base and snap lock a number ring firmly in place.

Abstract: A luminaire and mounting means are disclosed. Easy access into the luminaire for maintenance is provided by quick release trigger latches. Removal, replacement and alignment of a relfector and socket assembly are facilitated by slotted brackets on the reflector and within the housing.

Abstract: A tapered tubular pole with base connection wherein the tubular multi-sided pole wall is connected to the anchor bolts of the concrete and steel base by a multiplicity of individual connector bodies arranged in side by side relation around the periphery of the tubular sidewall at the lower end thereof, each of the connector bodies having a structural flange bearing against the outside of the tubular sidewall and connected thereto by a structural weld, the connector body having anchor bolt-receiving holes, and a diaphragm extending transversely across the pole and within the tubular sidewall and at the level of the structural welds by which the connector bodies are connected to the sidewall, the diaphragm being affixed to the sidewall.

Abstract: Disclosed is an electronic ring trip circuit which does not require the use of an electromagnetic ring trip relay. The circuit employs an optical coupler as the offhook detector to act on an essentially bi-stable operational amplifier which is normally in a ring enabling state. With the amplifier in this state, the circuit responds to ring current and a ring connect relay is enabled by the circuit for operation. When the called station goes off-hook, the amplifier is switched to its ring trip state and disables the ring connect relay. An input circuit for the ring current shunts this AC away from the optical coupler to render the coupler responsive to minor changes in DC resulting from the called station going off-hook.

Abstract: A telecommunications system using TDM principles for signalling and speech path usage plus PAM principles for speech transmission. Each function circuit such as a trunk, link or register, etc. is allocated a basic time slot or channel for initiation of its function when indicated. The active period of each function circuit is continued during the period of three succeeding time slots. In this way, up to four function circuits or channel units may be active during a finite period of time.In the system, a line is scanned at the end of each complete scan of all channels, thereby lessening the complexity of associating a line and a function circuit. The system shown uses the dual highway principle for its speech path and provision is made in each line circuit for switching onto both highways.

Abstract: In key telephone systems where a plurality of stations have access to a line by merely depressing a line key, a circuit is provided to prevent that station from entering a busy line. The circuit uses a single relay per station to provide a normal condition of privacy for any line at a station to equipped. The circuit senses the condition of the line and on a busy condition, the station cannot access the busy line. By providing all stations of a key group with privacy circuits, all stations can have complete privacy on line calls. Privacy control is possible on less than all stations of a system and less than all lines by selective deployment of privacy circuits. Optionally, a privacy release button can be provided to allow a station to enable other stations to access that busy line. Protection has been built into the circuit against transient surges and the like.

Abstract: A circuit is provided for detecting the condition of a signalling output being applied by a line circuit to a key telephone and for responding to a predetermined condition of the line circuit. The detecting circuit provides a comparison with the signalling output to identify the signalling output and produce an indication based on the condition signalled by the output. The input to the lamp circuit comparator is compared for amplitude and wave form with a reference for passage of the output signal. With the circuit configuration disclosed, a large range of amplitudes may be used as a basis for comparison in a plurality of wave forms.

Abstract: Disclosed is a key telephone system using a line concentrator and a form of TDM signalling. A single data and supervisory control pair of wires connects a station instrument to the system to effect all switching and supervisory controls for all lines to which the station has access, regardless of the number of these lines. Each station instrument also has a pair of speech wires which are switched within a station-line matrix under the control of a memory unit as directed by the data transmitted. Lines are grouped into groupings of up to five lines accessible to each station, there being a matrix and memory for controlling the switching of the matrix within each grouping. More than five lines may be accessible from a station instrument, such instrument having connections to multiple groups through a station circuit individual to that station. Within the system, many added features, such as speech pair security, restrictions on allowed service, and the like may be readily incorporated.