Patent GB-190523997-A (GB)
Title: Improvements in Electric Telegraphs.
Filed: 1905-11-21
Granted: 1906-11-15
Abstract: 23,997. Siemens Bros. & Co., and Grimston, G. S. Nov. 21. Order apparatus. -Relates to improvements in the order apparatus described in Specifications No. 26,686, A.D. 1904, and No. 6557, A.D. 1905, in which the armature of the receiver is mounted to rotate within a ring of electro-magnets which are energized in sets by means of a multiple-contact switch used as a transmitter. The present invention relates to improve. ments in the receiver, and in the selecting-device by which the particular receiver to be operated is selected when two or more such receivers are combined in one instrument. In the receiver described in the above-mentioned Specifications, each armature pole-piece subtends the same number of magnet poles in each position of the armature, but according to the present invention, each armature pole-piece r, Fig. 7, is opposite a different number of magnet poles q, which number is the same for each polepiece in alternate positions of the armature. Thus for any given number of orders, only half the number of magnets previously employed is necessary. Fig. 12 is a diagram of the connexions when the improved selecting-device is used, Fig. 7 showing the receiver and Fig. 9 the transmitter. In order to reduce the number of line-wires, the circle of electro-magnets q is not connected with the corresponding line-wires until the respective selecting-switch is closed at the transmitter. The armature of the magnet u, Figs. 7 and 12, carries contact springs v connected with the windings of the electro-magnets q, and connect them to the corresponding line-wires when the magnet is energized. The armature of magnet u may also carry a detent u<2>, preventing rotation of the armature r unless the magnet u is energized. The transmitter is provided with a switch handle y', Fig. 9, carrying a cross-head x which engages in an annular groove in the bolt z extending through the hollow shaft g to which both the sector i and transmitter handle h are keyed. On turning the handle y', the cross-head x brings the contact pins k<2>, k<5>, on to their contacts and withdraws the bolt z from beneath the spring pin h<4>, so that the detent h<1> is released from one of the notches c<1>, thus allowing the handle h to be turned to the required order. On releasing the handle y<1>, the spring y<2> returns the bolt z to its former position, all circuits being broken and the handle h locked in its new position. The switch handle y<1> must thus be held in its operative position while the handle of the transmitter is operated. The arrangement of the contacts k<2>, k<5> and the contact rings e<3>, e<6> is best seen in Fig. 12. Referring again to the receivers, the armature windings and the windings of the magnets u are in series and are connected to the terminals 6, 7 or 6, 8 or 6, 9 at the respective receivers. Terminals 7, 8, 9 are connected by separate line-wires to contact rings e<6> at the three transmitters. Thus, when the handle y' of any transmitter is turned, the contacts k<2>, k<5> of that transmitter complete a circuit from the battery terminal 10, through the ring e', contacts k<2>, k<5>, ring e<6>, line-wire 7 (or 8 or 9 according to the transmitter in use), armature winding, and magnet u of the selected receiver, and line-wire 6, to the other battery terminal. The excitation of magnet u connects the magnets q of the receiver to the line-wires, and the armature r takes up a position depending on the distribution of the energized magnets q, as in the former cases.