Patent GB-190803471-A (GB)
Title: Improvements in Apparatus for Signalling on Railways and Stopping Trains Independently of the Driver
Inventor: JACQUEMIN JOSEPH ELIE THEODULE
Filed: 1908-02-15
Granted: 1908-06-18
Abstract: 3471. Jacquemin, J. E. T., and Engels, E. J. A. Feb. 15. Locomotives.-An apparatus is described for automatically applying the Westinghouse brake of a train which passes a 'home' signal at danger, and for indicating to the driver his approach to and the position of the distant signals. A vertically movable track contact S, Fig. 1, is provided at the home signal, the contact being raised to the higher position to close the contact between the two engine brushes O, P when the signal goes to danger. A momentary circuit is thus closed through the relay Wand battery V, 'the relay then operating to close the circuit through the brake-releasing mechanism X. At the distant signal a laterally movable track contact is placed which operates to close a circuit between engine brushes L, M or M, N according as to whether the signal is on or off, the position a corresponding to the ' off' position. Circuits are then closed through similar relays Z, Z<1>, and the relays operate to close the circuit of the bell s, which notifies the driver of his approach to the signal, and at the same time a vane v, v<1> is caused to appear through a window to indicate the position of the signal to the driver. The construction of the relays is shown in Fig. 2, in which A is the armature of an electro-magnet L, which is in the circuit closed at the track contacts. A rod b attached to the armature is pivoted at a and is attached at its other end to a light rod B, which terminates at the ratchet mechanism C, which normally holds the piston F in the tube D against the action of the spring E. When the armature is attracted, the rod B displaces the ratchet C and allows the spring to push out the piston F, thus making contact at H and completing the circuit through the belt s in the case of the distant-signal relays, or through the releasing-mechanism X for the home-signal relay. The distant-signal relays are also provided with vanes G pivoted at c and mounted by means of a pin-and-slot connexion on the piston F so that the vane G will appear through the window when the piston is operated. The brake-releasing mechanism is shown in Fig. 4, in which A<1> is a metal disk fixed above the handle M' of the equalizing exhaust cock, to the centre of which disk is fixed a shaft B', which serves as the axis of rotation of the barrel C' containing a spring R<1> attached to the shaft and the barrel. The handle D' with the grip E' and the operating- rod F<1> is riveted to the barrel and carries the snug a', the handle being prevented from rotating under the action of the spring by the spring-held bolt H<1 >notched to engage, at its inner end, an arm of the armature K' of an electro-magnet in the circuit completed by the relay X. When this electro-magnet is energized, the bolt H<1> is released and springs inwards, allowing the rod F<1>, which is turned by the spring R' to revolve the brake handle and apply the brakes. The apparatus is reset by mechanically resetting the piston of the relay, thus breaking the circuit of the electromagnet, and then turning the arm D' back past the bolt H<1>, the rear face of the arm being curved inwards to allow the bolt to be pressed back for this purpose.