Abstract: A keyboard apparatus has item keys for data entry, and select keys for changing the display of input data written on sheets, according to the item keys, and a changer for the sheets stored in a cartridge, which separates the sheets in the cartridge into two groups, the sheets from one group being moved in the cartridge to a display position and the sheets from the other group being held in a non-display position. A cartridge holds the sheet to be displayed on the top of the stack of sheets remaining in the cartridge and a translator moves the sheets in the cartridge horizontally to the display position.

Abstract: An electronic control circuit for controlling left and right turn signal lamps including a turn signal circuit to activate the left or right lamp and then automatically deactivate either lamp after a predetermined time period, a hazard signal circuit to flash the left and right lamps simultaneously, a circuit to override the hazard signal circuit to activate the left or right lamp for the predetermined time period and then to reactivate the hazard signal circuit to flash the left and right lamps simultaneously, a circuit to deactivate one of the lamps during the predetermined time period and activate the other lamp, and a circuit to automatically activate the hazard signal circuit when an ignition switch is locked in a park position.

Abstract: An alarm device for doors having in series an electric supply, such as batteries, three switches and a relay. The relay is locked upon the simultaneous closing of the three switches and actuates an alarm circuit. The first and second switches are respectively closed and open when the door is closed and respectively open and closed when the door is fully open. The three switches are closed during the opening and closing of the door and when the door is ajar and the door bolt is retracted. The third switch is controlled by the bolt and is closed except when the bolt is retracted.

Abstract: A portable, heavy duty emerency power pack for hooking up to the lighting system of a vehicle trailer, such as a semi-trailer, camper, mobile home or the like, for the purpose of flashing all or some of the trailer lights on and off while the trailer is unhitched on the side of a road so as to warn passing motorists of its presence. In a preferred embodiment, the device includes a pair of heavy duty batteries connected in parallel, an on-off switch, a flasher, and a heavy duty case for housing these components. A cable extends from the case and is terminated by an adapter plug for connecting to a mating socket on the vehicle trailer. The case also preferably includes a carrying handle which is operatively connected to means for securing and locking the case to the trailer. The case further includes a lid having a lock device for securing the contents thereof against tampering.

Abstract: A garage door opener system includes a radio receiver actuable by reception of a preselected radio signal for moving a garage door between opened and closed positions and a portable hand-held transmitter manually actuable to transmit such preselected radio signal to the receiver. The transmitter includes a radio frequency oscillator for producing the radio signal to be transmitted and a modulating means manually actuable to cause the oscillator to transmit a radio signal which is of the preselected form. An audio transducer is connected in parallel with the radio frequency oscillator to the output of the modulating means to produce an audio signal which corresponds in form to the electric signal modulating the radio frequency oscillator, which audio signal is audible to a person holding the portable transmitter.

Abstract: A device of indicating the charging state of a battery including a series combination of a diode and an indicating lamp connected between an output terminal of a rectifying means of an alternator and a battery. A first switching means activates the indicating lamp when the battery voltage is less than a first lower predetermined value. A second switching means turns the first switching means off when the battery voltage rises above the first predetermined value. A third switching means reactivates the indicating lamp when the battery voltage exceeds a second higher predetermined value.

Abstract: A charge-mode signal conditioning interface includes a charge-mode signal multiplexer for providing a low impedance series path for the output charge signals from each charge source to the input of the common charge amplifier, one at a time in each sample time interval of a repetitive sequence of sample time intervals and non-sample time intervals for each source, and for providing a low impedance shunt path for each charge source in each non-sample interval.

Abstract: A home security and garage door operator system includes a gas sensor for detecting the level of toxic gas in the garage. When the gas level exceeds a predetermined threshold the garage door is automatically opened. Lock out circuitry is provided for preventing the door from being accidentally closed as long as the gas sensor detects an excessive level of toxic gas in the garage. A two button transmitter is used to sequentially close the garage door and set a security alarm subsystem. Warning devices are activated if the security alarm is attempted to be set without the garage door and windows in the home being closed. Once the security alarm has been set, the lock out circuitry also disables the garage door motor control circuitry until the security alarm is first deactivated. The transmitter generates a digital pulse train according to a preselected code, with the operation of the dual buttons changing the state of a particular control bit in the pulse train.

Abstract: A radio controller for radio control of model vehicles and the like. The controller can be placed in a control mode wherein vehicle functions such as motor speed, direction, horn and lights are controlled by control signals. In addition, the controller can be placed in a voice transmission mode wherein an audio signal is transmitted to the vehicle and broadcast from a speaker mounted on the vehicle. The receiver of the radio controller is switched from the control mode to the voice transmission mode by way of the control signals. When the receiver is placed in the voice transmission mode, the control signals are ignored with switching to the control mode being accomplished by receiver circuitry which detects a momentary absence of the transmitted carrier signal.

Abstract: In a vehicle alarm system there is provided apparatus for producing a digital control signal that defines a command to initiate a timing operation such as an entry delay. The apparatus comprises a transducer, preferably including a piezoelectric device, for generating an electrical waveform that, while the vehicle is undergoing vibration, has an acceleration-representing analog signal component. The apparatus further comprises threshold-setting circuitry responsive to the electrical waveform for causing the initiate-timing command to be given when the acceleration representing signal component exceeds a predetermined threshold.

Abstract: A flashing light system for mounting on the roof of a police car or other vehicle where special warning lights are desired. The system includes a plurality of lights preferably arranged side-by-side across the width of the vehicle roof, each of the lights having associated therewith a parabolic reflector or beam-shaping lens which rotates about a vertical axis approximately coaxial with the axis of the corresponding light source thereby creating a flashing effect. The several parabolic reflectors or beam-shaping lenses are driven conjointly from a common drive motor, and the plurality of rotatable reflectors or lenses may be arranged at predetermined angles relative to one another so as to vary the sequence of the light flashes and thus create an unlimited variety of different flashing effects.

Abstract: The system contains a number of monitoring devices, such as bedside units for monitoring parameters of patients, and a central station in star connection. Each monitoring device contains a signal generator and a display device for the display of monitored parameters. The central station contains a central display device and a central multiplexer. The multiplexer has a separate signal input for receiving the output signals of each signal generator, and a first and second number of multiplexer outputs. The output signals of the signal generators each contain undelayed and delayed signal data. The first multiplexer outputs can be connected to the central display device. Thereby, the undelayed signal data contained in the output signals of selected monitoring devices can be displayed in the central station. These signal data represent all parameters monitored by the selected device.

Abstract: A combined remote control unit is provided for wireless communication equipment such as television receivers, frequency modulation or amplitude modulation radio receivers, or other equipment used in wireless communication systems, the remote control unit being capable of setting the equipment to any selected signal channel, and the remote control unit concomitantly causing the antenna associated with the equipment to be rotated to an angular position at which optimum signal processing in the selected channel may be effectuated.

Abstract: A signal lamp apparatus with a lamp burnout detecting circuit has a right turn signal lamp group and a left turn signal lamp group which are connected to a power source through a turn signal switch and a relay contact coupled in parallel with a burnout detecting resistor. Each of the lamp groups includes a plurality of signal lamps connected in parallel with one another. The apparatus includes a comparator which produces an output signal when the voltage across the signal lamp group is higher than a predetermined voltage, and a device which produces a burnout signal when the comparator has an output signal after lights-out, for example, after 20 to 100 m sec since the relay contact is opened. With such an arrangement, the burnout of the signal lamp or lamps may be detected while the signal light lamp group is flashing.

Abstract: A control circuit for the turn-signal flasher system of an automotive vehicle. The flasher system includes a relay having switch contacts which are serially connected, together with a direction indicator switch, between the vehicle battery and the turn-signal lamps. A measuring or sampling resistor is connected between the battery and the relay contacts. First and second pulse generators are connected between a first voltage indicator and the relay coil, and are selectively gated to interrupt the relay during normal lamp load conditions. The first pulse generator provides a normal mark-to-space ratio whereas the second pulse generator provides a reduced mark-to-space ratio for use during night driving conditions. Third and fourth pulse generators are responsive to corresponding voltage indicators connected to the measuring resistor. The third and fourth generators function to respectively provide different mark-to-space ratios in response to, and indicative of, lamp outage or current-overload conditions.

Abstract: An alarm system includes a security loop comprising a plurality of sensors, a circuit connected to the security loop and an alarm. The circuit is responsive to a change in condition within the security loop, and upon any change over a threshold value or substantially any change which is rapid, irrespective of value, the responsive circuit functions to enable the alarm. The alarm may be of audible and/or visual-type with additional capability of signalling a remote control center. The responsive circuit includes a network for self-balance thereby to compensate for changes which are responsive to ambient conditions.

Abstract: A central station alarm reporting system having a remote premises unit which is polled by the central station using FSK messages and reports its alarm information in DTMF (dual tone multifrequency) messages wherein a plurality of parallel bits of information is reported by the remote premises unit using a transmission comprising two tones, one tone selected from a group of high frequencies and one tone selected from a group of low frequencies, and said central station decoding the tone transmission into its bits of information. For example, if four low frequencies and four high frequencies are used at the remote premises, then the central station provides four output lines which are capable of completely describing the sixteen combinations of four parallel bits of information which can be constructed when selecting two tones for a dual tone multifrequency transmission, one tone selectable from a group of four low frequencies and one tone selectable from a group of four high frequencies.

Abstract: A time synchronization system involves a master station sending time information to a remote station and in which a portion of the time message is used as a trigger to start a counter or interval clock in the remote station. When the time message is concluded, the remote station adds the time in the interval clock or counter to the time from the message received to create an actual time which replaces the existing time information in the remote station clock. The time portion of the message sent represents the actual time at which the trigger in the time message was actuated and represents a later portion of the message as sent.

Abstract: A container for an alarm transmitter used in combination with components of a transmitter circuitry which includes voltage control for providing a gated voltage and controlled by a timing circuit. The components also include an audio multivibrator which is electrically coupled to the voltage control in order to receive the gated voltage, a microfork audio filter which is electrically coupled to the audio multivibrator and a modulator which is electrically coupled to the audio multivibrator. The components further include a radio frequency oscillator whose frequency is modulated by the modulator and which has an antenna electrically coupled to its output terminal. The container includes a tubular member which is adapted to be installed into a hole in a wall adjacent to a door or a window and an elongated, rectangular member adapted to be inserted into the tubular member and also adapted to have the components of the transmitter circuitry placed thereon.

Abstract: Emergency phone stations distributed at intervals of 1 or 2 km along a highway area and connected to a communications channel with a power line. Each phone station has a set of flash lamps which can be blinked in accordance with differing blinking schedules, and with a storage capacitor which stores flash energy. When a lamp is flashed, the storage capacitor discharges from the power line, the charging time-constant of each station being different due to differing distances from a central station. To impose an order on the network, central clocking is employed, with lamp ignitions occurring at each individual station being referenced to clocking signals common to all stations, so that the blinking schedules at all activated stations have a fixed phase interrelationship. This predetermines the times and sequences at which the storage capacitors will recharge. All storage capacitors are identical and are so selected that t.sub.0 /R.C.sub.ges =0.5 to 3, preferably 1.25, t.sub.