Patent GB-190202191-A (GB)
Title: Improvements in Fog-signaling Apparatus for Railways.
Inventor: HAMERSLAG HENRY
Filed: 1902-01-28
Granted: 1902-11-13
Abstract: 2191. Hamerslag, H. Jan. 28. Fog and audible signals; signals on engines &c. ; indicaturs and repeaters, signal ; indicating and recording movements of trains; signalling to cabins &c. ; contacts, electric.-The ' danger' and 'warning' or 'caution' positions of the ordinary signal are indicated to the driver by means of bell and lamp signals on the engine, and simultaneously with such indication the position of the train is indicated to the signalman by an ordinary bell and indicator in the cabin. The operation is effected by the contact bar or bridge B, Fig. 1, which, in its raised or operative position, is adapted to lift the spring-controlled bar LS, Fig. 5, of the apparatus on the engine. The bar B is of channel section, similar to the old railway rails, covered by a faceplate FP, and hinged to a block H on the track. The bar is operated by the cams CM on the rocking shaft s, which carries a weighted lever WB and has an arm connected to the ordinary signal-operating mechanism &c. by the connection cr, the weight W raising the cams and the bar when the signal is put to 'caution' or ' danger.' When, as at junctions, the signal is put to 'caution,' the bar B is raised by the shorter of the two cams CM, and is then in position to raise the bar LS, Fig. 5, so that the contact block CB carried thereby closes the contact c<4> in the circuit of the electromagnet M<2>, Figs. 8 and 9, which, when energized, releases the catch armature s<2> from the drop shutter s<4>. This shutter, when released, falls and uncovers the glasses g<2>, g<3>, coloured green and red, respectively, to the light of the lamp L, and, at the same time, closes the contact s<3> in the circuit of an electric bell, which continues to ring until the shutter is re-set. When the ordinary signal is put to 'danger,' the bar B is raised by the longer cam CM to a higher position, in which it raises the bar LS sufficiently to close both contacts c<4>, c<3> in the circuits of the magnets M<2>, M<1>, respectively, thereby releasing both shutters s<4>, s<5>. In this case, the action of the shutter s<4> is the same as when operated at a 'caution' signal, but the shutter s<5>, which has a central aperture s<6>, falls on to the stops X, X<1>, covering the green glass g<2> and showing a second red light through the second red glass g<1>. The shutters are re-set by the finger-lift L, Fig. 9. The contact box, Fig. 5, and the indicator are provided with screw unions U, for the attachment of a tube protecting the leads a, b, c, d, e. The contact box is also provided with a bar for coiling up surplus wire, and the dry batteries c', c', which operate the bell and indicator, are secured in it by leather bands lb. The bar LS is provided with a roller R, to take the impact of the bar B, and the contact block CB is provided with rollers for operating the contacts c<4>, c<3> which are set in opposite directions. The circuit of the bell and indicator in the signal cabin is closed within the bar B, between a contact carried by the bar R and a second contact connected to a push, which is protected by the spring- plate SP, The stop-bar D and block E prevent the bar B from being raised too far.