Abstract:
The disclosure relates to a track circuit for detecting the presence of a train on a long section of a railway track equipped with an AC traction power line, wherein the two rails of the section are insulated from the adjoining sections at each end thereof, comprising a generator connected to one end of the railway section for generating a voltage at a frequency which is approximately equidistant from the fundamental frequency of the power line and from the second harmonic thereof, the generated voltage comprising a series of pulse trains having a very low repetition rate. The track circuit also comprises a receiver for detecting the generated voltage at the opposite end of the railway section. The receiver includes an amplitude discriminator for eliminating the signals the amplitude of which is lower than a predetermined level and a selective demodulator which provides an output only when its input is energized by a signal at the above-mentioned repetition rate.
Abstract:
Resilient wheel for railroad bogie running at high speed, comprising, a rim having a hub adapted to be rotated around the extremity of a shaft capable of being resiliently displaced only in a longitudinal direction, the other extremity of the shaft carrying an opposite wheel. The rim is provided with a tire surrounded by a metallic strip provided with a flange necessary for rolling on a rail. A disc is adapted to slide perpendicularly to the shaft between two plates connected to the rim. Resilient means are adapted to be compressed during the longitudinal displacement of the shaft. The resilient means are so conceived as to provide a non-linear law of the deformation strain as a function of the longitudinal displacement of the shaft.
Abstract:
A simulated cockpit in a dive and pullout flight simulator having a pilot seating means supported for movements about a roll axis and a pitch axis only, the roll axis being located below the simulated cockpit and in a plane including the vertical plane of symmetry of the simulated cockpit, the pitch axis being located below the roll axis and located about one meter rearwardly and about two meters below the pilot seating means. The invention is characterized also in that the roll axis support means is in turn supported for movement with the simulated cockpit about the pitch axis during actuated movement of the cockpit during the dive and pullout flight simulation procedure.
Abstract:
This invention concerns a smoothing choke of a highly reduced weight. The smoothing choke consists of a magnetic core made up of a stock of trapezoidal metal sheets having the two parallel sides thereof alternately reversed so as to obtain a core of general parallepipedal shape having, at each end thereof, a groove in the shape of a triangular prism. A coil is wound around the core and has outer turns the perimeter of which is successively reduced by step-like winding, from the turns around the central part of the core, symmetrically, to the turns around the ends of the latter.
Abstract:
A guide beam for plural carriages including supporting rails secured to the beam, driving devices disposed along the rails each associated with a carriage and operated by a separate motor, troughs placed along the length of the beam, flexible cables placed in the troughs, and a hollow arm fixed to each carriage and the end of which moves above each trough, the flexible cables placed in each trough being inserted into the end of the arm located above the trough. The guide beam is characterized by guide tracks placed along the beam one for each carriage and by caterpillars for the cables, each being movable above its associated trough in one of the guide tracks, and supporting the end of the variable length of the cables which are inserted into the hollow arm.