Patent GB-190107626-A (GB)
Inventor: BRAAM JACQUES PIERRE VAN
Filed: 1901-04-13
Granted: 1902-02-06
Abstract: 7626. Braam, J. P. van. April 13. Signals on engines etc.; stopping engines &c. ; indicators and repeaters, signal ; recording signals. - Relates to apparatus for automatically applying the brakes of a train when it passes a 'danger' signal. A single - operating treadle 53, Fig. 4, is employed at a distant signal station, and two similar treadles at the stopping - signal. A cock a, Fig. 13, is fixed to the guard of the engine, and connected at the end s to the pneumatic brake system, the disc y on the squared end x of the plug b having an arm c connected to a spring 52, Fig. 9. A sliding block d is mounted in the disc y under control of the spring p, and is provided with a spring-controlled latch 45, l. The cock is operated by the knucklejointed lever e, h striking one of the treadles 53, when the latter is in the raised position corresponding to the danger' position of the signal. When the lever e is operated by the distant treadle, its hook f is disengaged from the projection g, and the lever c is moved by the spring 52 from the position I to the position II, Fig. 9, where it is stopped by the block d engaging the projection o. This movement of the lever c partially opens the cock a, so as to bring the brake blocks into contact with the wheels, while at the same time the indication line clear' on the indicator l, Fig. 18, is replaced by proceed with caution.' The indicator is mounted close to the driver, and its operating- spindle 9 is geared through an intermediate shaft to a bevel segment on the disc y. The indications are on the fixed disc 11, and the proper indication is exposed through a sight aperture in the disc 12, which is connected to the sleeve 17, actuated by the gearing 7, 8 from the spindle 9. The spindle 5 on which the sleeve 17 is fixed is provided with a cam 29, which, when the indicator is operated, actuates a lever to open the steam whistle. When the apparatus has been operated by the distant treadle, it can be reset by the driver by means of the lever 6, the arm 22 of which carries a pawl 20 engaging a cam 15 on the sleeve 17. The pawl 20 is interengaged with a second pawl 27 actuated by the cam 18, to prevent the lever 6 from being moved in the opposite direction to that required for setting the apparatus. When the lever e is operated a second time without being reset, the book k on the lever h engages the tooth l of the latch 45, and moves the block d to the right, Fig. 9, so as to disengage it from the projection o. The spring 52 then moves the lever c into the position III, so opening the cock a to its full extent to apply the brakes, and changing the indication of the indicator 1 to ' danger.' The lever 6 is also moved so as to shear off a button attached by a wire in the front of the indicator, the removal of the button indicating that a `danger' signal has been passed. The block d also is thrown back by its spring p underneath the projection o, so that the apparatus cannot be reset by the lever 6. The two operations of the lever e would be effected ordinarily by the two treadles at the stopping' signal, the apparatus beiug reset by the driver after the distant treadle is passed. If, however, the driver omits to reset the apparatus, the second operation of the lever e will be effected by the first treadle at the stopping-signal, the operation by the second treadle at the stopping-signal being the non-effective. A second lever e, having its knuckle-joint in the opposite direction, may be mounted on the other guard, so as to be operated when the engine travels in the reverse direction, the second lever being connected by suitable linkage to the part h of the first lever.