Patent GB-190109954-A (GB)
Title: Improvement in or in Connection with Signalling on Railways.
Inventor: KERSHAW WILLIAM
Filed: 1901-05-14
Granted: 1902-05-01
Abstract: 9954. Kershaw, W., Cliff, W., Chorley, R., and Pilkington, A. E. May 14. Signals on engines ; indicators and repeaters, signal.-Relates to means for indicating to the engine-driver the position of the ordinary semaphores, the indications given also distinguishing the `home' from the ' distant' signal. The invention is primarily intended to be used in conjunction with the signalling-apparatus described in Specification No. 22,483, A.D. 1894 (in which bell or gong and visible indications of the positions of the signals are given on the engine, by the movement of a vertical rod actuated by contact-bars arranged on the track and worked in conjunction with the ordinary signals), but it may also be used with any track apparatus arranged to effect a single movement at the distant' signal, and a double or different movement at the ' home' signal. Two indicating-sectors h, f, of which the latter is about half the size of the former, are mounted on an axis d under control of springs e. The sector h indicates the position of the 'distant' signal, one half of it being coloured red, and the other half, which is normallv in view through the sight aperture n, white. The sector f indicates the danger' position of the 'home' signal, and is all red. To enable the red portion of the sector h to be distinguished from the sector f, the former is marked with a white disc having a central black spot, and the latter with two such discs and spots k. Other distinguishing-colours may be employed in lieu of those described. If both ' distant' and 'home' signals are at 'line ' clear,' the apparatus is not affected, the white part of the sector h being in view. If the 'distant' signal is at 'danger,' the rod a is raised once, and the stud m on the rod turns both sectors, so that the red portions are brought into line with the aperture n, the front sector f being in view. By the same movement of the rod, the spring catch b actuates the hammer z of the bell y, and the spring catch c actuates the spring latch r, which carries a stud s adapted to engage the projection h w on the sector h, to lock this sector in the `danger' position. When the rod a falls, the sector f returns to its original position, and exposes the red part of the sector h. If the 'home' signal is at 'line clear' when it is reached, the apparatus is not affected, but an additional track apparatus raises the rod a to disengage the latch r, so that the sector h returns to its normal position. If, however, the ' home' signal is at 'danger,' the rod a is twice raised, the first movement releasing the sector h, and the second moving the sectors so that the aectorf is exposed. The movements of the rod a at the ' home' signal are shorter than the movement at the ' distant' signal, so that the latch r does not come into operation. On the second movement of the rod at the ' home' signal, it is held up by a prolongation of the contact-bar, or by electromagnetic means &c. to maintain the danger' indication until the signal is lowered. The sectors may be arranged to be moved by levers attached to them, and actuated by links from the rod, or by an electromagnet.