Abstract: This invention relates to electric clocks and chart recorders driven by crystal controlled electric motors. The motor includes two stator plates, a rotor and a drive coil surrounding the legs of the stator plates. The rotor carries a pinion which drives the first gear of a mechanical gear train located between two side plates consisting of synthetic resin material. One of the side plates carries at least one bearing for the rotor and a plurality of projections which fit into holes in the stator plates and serve to position the stator plates in relation to the rotor. Electric pulses are supplied to the drive coil by an electronic frequency divider circuit having a push-pull output stage; a zener diode is connected in parallel with the power supply to the divider circuit and the drive coil to enable the motor to operate satisfactorily over a range of supply voltages.

Abstract: An apparatus for monitoring the condition of a fluid filter comprises a flexible diaphragm exposed to the upstream, downstream or differential pressure acting on the filter and indicator means for monitoring the condition of the filter as a function of movement of the diaphragm in response to said pressures. A unique, low friction indicator mechanism, means for adjusting the sensitivity of the device and means for resetting the device are also disclosed.

Abstract: According to the invention, a car, for a transporter system, is provided, as means for detecting the close proximity of another car, with a device operated alternately as a signal transmitter and as a receiver and a plurality of plates at sides of the car, at least one plate, for example that of the leading side, being connected to the said device to serve as a receiving plate when the device is operating as a receiver and at least one plate being so connected to serve as a transmitting plate when the said device is operating as transmitter. Advantageously, switch means automatically changes over the connections of the plates to the said device in dependence upon the direction of travel. The output of the device when operating as a receiver may interrupt the driving of the car upon the detection of another car within a predetermined proximity.

Abstract: An automatic vehicle operation system which responds to a plurality of speed commands and a plurality of stopping commands. The vehicle is controlled to travel at one of a plurality of speeds in response to one of a plurality of speed commands. The vehicle can also be controlled to stop a predetermined distance after receipt of one of the two stopping commands. Which of the two stopping commands is received determines the distance over which the vehicle travels between receipt of the stopping command and the point at which the vehicle comes to rest. Regardless of which of the commands is received the vehicle is controlled so as to respect predetermined acceleration and jerk limits during periods of acceleration and deceleration. The acceleration control circuit is responsive not only to velocity rate of change but also to the grade over which the vehicle is traveling so as to limit the total acceleration of deceleration forces to a predetermined maximum.

Abstract: A multi-cuff endo-tracheal tube which minimizes the irritation to the trachea by alternately inflating one or the other of two cuffs. A short period of time after one cuff is inflated the previously inflated cuff is deflated. This removes the possible source of irritation on the trachea at the point of contact with the second cuff. After the first cuff has been in operation for a predetermined period of time, the second cuff is inflated and after another short interval, the first cuff is deflated. A control system alternately and sequentially inflates and deflates the cuffs in the proper sequence, automatically. The control system is fail-safe in that, in the event of cuff rupture, overpressurization, or electrical failure, one or the other of the cuffs remains inflated to seal the endo-tracheal tube and the control system alerts attendant personnel.

Abstract: A servo device for steering gears for vehicles and ships is adapted to be coupled in a mechanical connection between said gear or the like and the steering rod or the like operated thereby. The device comprises a pair of opposed cylinder-and-piston units each having a working chamber, defined by the respective piston and adapted to be supplied pressurized fluid from a suitable source during control by valve means responsive to a movement of the output member of said gear and the resistance thereagainst of the steering rod operated thereby so as to amplify the power for overcoming said resistance by means of the pressure fluid in one of said pair of working chambers.