Patent GB-190220391-A (GB)
Title: An Improved System of Railway Signalling, and Apparatus in connection therewith.
Inventor: WETHERELL RAYMOND EDWARD CORDE
Filed: 1902-09-18
Granted: 1903-01-22
Abstract: 20,391. Wetherell, R. E. C. Sept. 18. Signals on engines; ; indicators and repeaters, signal contacts, mechanical; contacts, electric.-Relates to a system and apparatus for indicating to an engine driver during foggy weather what are the positions of the ordinary semaphore signals. The indications are given by a gong, an electric bell, a semaphore and a sector plate, parts of which, coloured differently, may be seen through a window. Beside the track rails e<1>, e<2>, Fig. 20, are extra lengths of rail W<1>, Y, W<3> Y<4> W<2>, Y<3>. The rails W<1>, W<2>, W<3> are fixed, and the others are connected to and operated by the wires Y', k working the distant and home signals W, X respectively. The rails W<1>, Y project slightly above the track rails, and the rail Y can be moved sideways into operative position. The rails W', w<3>, Y<3>, Y<4> project considerably above the track rails, and the rails Y<3>, Y<4> can be moved sideways like the rail Y. The locomotive carries two broad wheels D, D<1> for running on the track rails and also, at times, on the extra rails above mentioned. Each wheel D or D<1> may consist of two wheels on the same axle. The wheels D<1>, D are carried on arms respectively fixed to and loose on the spindles B, b. These arms are connected by bell-crank levers to rods &c. E, E<1>. Thus when the wheel D or D<1> runs up and along one of the extra rails W<1>, Y, &c. one of the rods E, E' is pulled down. These rods are connected to'the weighted levers H<1>, H<3>, Fig. 10, pivoted at H to a casing fixed in view of the engine driver. The levers H<1>, H<2> are connected by looped links K' to the sliding rod J and by looped links P, p<1> to the weighted arm 0<1> pivoted at 0 to the casing. A semaphore arm S is loosely pivoted at 0 and rigidly connected to a similar arm outside a cover of the casing and within view of the driver. A window in this cover allows either of the sections n, p, x of the sector plate N<2> to be visible. This sector plate is pivoted at L, and carries an arm N<3>. A piece L' is also pivoted at L, and a hooked piece R<1> is pivoted at R and acted on by a spring g. These parts operate as follows :- When the signal W is at ' clear,' the rail W<1> causes a short pull downwards to be given to one of the rods E, E'. A pull is thus given to the rod J, which carries a tappet M for operating the gong M<3>. The semaphore S remains at `clear,' and the green part n of the sector plate shows through the window. When the signal W is at danger,' the rails W', Y cause a short pull to be given to both rods E, E', and the gong is rung as before ; but, as both links P, p<1> move up, the lever 0<1> is allowed to fall and raise the semaphore S to ' danger' by means of the pin T. It remains at `danger' after the rails W', Y are passed by the engagement of the pin S' in the notch S<2>. When the signal X is at 'clear,' the rail W<3> causes a long pull to be given to one of the rods E, E'. The rod J is pulled down to ring the gong M<3>, and the collar m then strikes the arm L<2>, rocking the piece L<1> and by means of the pin N' lifting the sector plate till the red part p shows through the window. The semaphore S is also liberated so that it falls and remains at `clear,' a pin S<1> upon it holding the piece R' aside. Should, finally, the signal X be at ' danger,' a long pull is given to both the rods E, E'. This sets the semaphore S at ` danger: If the driver runs past these rails W<3>, Y<4>, the piece L' is liberated and makes electrical contact between the stud L<5> and arm N<3> so as to ring an electric bell, the pin R<2> resting in the notched piece R<1> serving to hold the arm N<3> up. The rails W<2>, Y<3> of the home signal X act in the same way as the home-warning rails W<3>, Y<4>. If any of the parts break, the semaphore S is put to danger, and the part x, marked " out of order," shows through the window. The apparatus works equally well whichever end of the locomotive points to the front.