Patent GB-190410545-A (GB)
Title: Improvements in and relating to Railway Point and Signal Apparatus.
Filed: 1904-05-07
Granted: 1905-03-09
Abstract: 10,545. Dutton, C., and McKenzie & Holland. May 7. Semaphore and similar outdoor signals; safety and locking bars.-Consists in means whereby locking- bars, signals, railway points, or the like, can be worked either from the main signal cabin or from a subsidiary ground frame or hand-lever, the means having been designed principally for use in connection with a key, train staff, tablet, or other equivalent known system of working. When a key is used to lock the main cabin levers, Annett's lock is used, but, where a tablet, train staff, or other equivalent is used, the cabin lever may be locked as described in Specification No. 17,195, A.D. 1895. Fig. 3 shows a toggle or link-and-lever form of the device adapted for a pull on the rods. The rod 8 is connected to the lever in the signal cabin, the rod 9 to the points, signals, &c., and the rod 10 to the operating-lever in the ground frame. The broken lines show the position of the levers when the lever in the signal cabin has been moved into the reverse position, the links 6, 7 being kept in line owing to the groundframe levers being locked. The broken lines in Fig. 4 show how the signals &c. are operated from the ground frame, the cabin levers being locked. To adapt this device for a push on the rods, the links 6, 7 are connected to the lower ends of the levers 4, 5. A modification is described in which the rods 8, 9, instead of being connected to the levers 4, 5, are fitted with antifriction rollers working in connection with suitable guides. Fig. 7 shows a further modification in which the lefthand lever is mounted on a sliding centre 18. The pivot 18, being connected to the ground frame by the bell crank lever and links shown, remains fixed when the signal-cabin levers are operated, but slides in its guides when the ground-frame levers are operated. Fig. 10 shows another form of the device, which consists of two slides 27, 28, the slide 27 being arranged to work in, and at rightangles to, the slide 28. A pin 33 on the end of the rod 9 works in the diagonally-arranged slot 32 in the slide 27. When either of the rods 8, 10 is operated, the rod 9 is moved as before. In a modification, the diagonal groove is arranged on a drum. Fig. 17 shows another form of the device, in which a rack is provided on the rods 8, 9, and a pinion 46 is adapted to work between these racks. The pinion is connected to the rod 10 by the arms 47. Another form of the device is shown in Fig. 21, in which the end or blade of the rod 8 is adapted to work in the jaws 50 formed on the rod 9. The blade and jaws are slotted to take exactly a key 53 connected to the rod 10. When the key is in the position shown in Fig. 21, the rods 8, 9 are fixed together, but, when the key is moved so that the smaller part is in the slot, the rods can move independently. Fig. 19 illustrates the use of the last device on a single-line railway. When the lock M of the ground frame C' has been unlocked, its lever is moved over, thus releasing the connection between the cabin levers and the points &c. by means of the keys 53, 53<a>, 53<b>, and connecting the points &c. to the ground-frame levers C by the keys 53<c>, 53<d>, 53<e>.