Patent GB-191316193-A (GB)
Title: Improvements in Apparatus for Controlling the Traffic on Single Line Railways.
IPC: B61L23/24
Filed: 1913-07-14
Granted: 1914-10-14
Abstract: 16,193. Tyer, W. E., and Tyer & Go. July 14. Staff, tablet, and ticket systems.-A token carrier or slide is withdrawn from and returned to the magazine simultaneously with the rotation of the commutator spindle. The apparatus is of the general character of that described in Specification 18,303/10. The commutator is geared by a segmental gear to the screw for raising and lowering the tablets in the magazine and also actuates a cam which reciprocates the tablet slide. Electro-magnetic locking- devices hold the instrument against movement in its normal position and in the position occupied when a tablet is out for the section, these locking-devices being released by currents of different polarity. In the normal position of the instruments, the slide e is in the position shown in Fig. 1, the opening e<o> forming an extension of the magazine d<0>, the uppermost tablet being just below the bottom surface of the plate, and the commutator bars i, i<1> connecting their co-acting springs, so as to connect the positive pole of the battery to the line wire when the bell key q is depressed. The operator, say Y, who desires to obtain a tablet, first signals by bell q<0> and then sends a positive current from his battery u over contacts 13, 1 of bell key q, indicator r, to the line wire terminal L, thence to the distant instrument, say X, indicator contacts 1, 2, polarized relay p, to earth terminal E. The bells q<0> are sounded by the closing of the circuit to relay p, which completes the circuit to the bell if the switch-key s is normal to the bell, or if the switch-key is pushed, to one of the magnets n<0>, o‹, according to the direction of current in the coils of relay p. The positive current from Y energizes the coil n<0> which raises the armature n to release the tooth m<1> on the disk m on the commutator spindle, which can then be turned in a clockwise direction for one-third of a revolution, in which position it becomes locked by the tooth m<3> on the side of the disk engaging a tooth o<1> on the armature o, and the tooth m<2> engaging the tooth n<1>. The commutator is thus locked against further movement in either direction, and its contact bars j, j<1> make connexions enabling the operator X to send a negative current to instrument Y which causes the energization of the magnet n<0> to permit rotation of the commutator counterclockwise for two-thirds of a revolution, when it becomes locked as above described. The rotation of the commutator at X serves, through equal gear wheels a<1>, f<1>, to move the cam f so as to move the tablet slide e outwards, the pinion e<2> thereon being moved by the helical portion g<1> of the cam groove. The commutator at Y, during the first part of its movement, does not move the slide e, since the groove g is at right angles to the axis of the commutator, but through gears a<2>, b, b<1>, c' rotates the screw c‹ so as to lift the pile of tablets a distance equal to the thickness of a tablet, thus inserting the top tablet in the slide e. The segment a<2> then disengages the wheel b, and during the remainder of the movement of the commutator. the pin e is moved by the helical portion g<2> of the cam groove to withdraw the slide and tablet. The state of the section is shown by inscriptions on the disk x<5> fast on the cam-drum, in conjunction with a slide x<1> which, by means of a hinged pawl x<4> engaged by a pin x<2> is raised only by the clockwise movement of the commutator. The number of tablets in an instrument is shown by a counting-wheel x, actuated by the commutator spindle. When the tablet is returned to either operator, say X, he puts it in the space e<0> in the slide e, and signals to Y who then closes his bell-key q and so sends a negative current to X to release the commutator, which can then be turned clockwise through two-thirds of a revolution to move the slide inwards and then to lower the tablet into the magazine. A positive current can then be sent from X to release the other instrument for return to normal, by turning counterclockwise through one-third of a revolution. In case it is attempted to return the slide at X without the tablet in place, the complete movement is prevented by the rod v which is spring-pressed upwards and is normally held down by the tablet, but which, when the empty slide moves inwards, while the commutator is turned clockwise, moves upwards, and a pin on the block v<2> secured to the rod enters a radial notch in a cam groove in a plate v<5> to lock the apparatus.