Patent GB-191000671-A (GB)
Title: Improvements in Electromagnets for use in connection with Electrically-controlled Signalling Apparatus and for other purposes.
Inventor: THOMPSON WILLIAM PHILLIPS
IPC: H01H51/08
Filed: 1910-01-10
Granted: 1911-01-10
Abstract: 671. Thompson, W. P., [Morse Code Signal Co.]. Jan. 10. Electro - magnets. - To produce a number of operations differing in character by the passage of a current through a single electro-magnet, two or more magnetically-separated cores are arranged within the same coil or coils, and one set of cores is influenced by a permanent magnet, thereby differentiating the action of the cores upon their respective armatures. Figs. 2, 4, 5, 6, and 9 show the invention applied to an electric signalling system. A pair of coils 9 are provided with cores 3 carried by a bar 2 joining the ends of a permanent magnet 1 and also with cores 7 separated from the cores 3 by insulating - material 5, and provided with pole-pieces 13, which serve to attract an armature 17. The armature 17 is carried by a counterweighted ;lever 15 mounted on a pivotpin 21, and drops by gravity when the pole-pieces 13 are demagnetized. The lever 15 is provided with a projection 25, which is adapted to enter a notch 29 in a selecting-wheel 27 ; this is rotated by the alternating pull of the core-pieces 3 upon an armature 33 through a swinging arm 35, pawls 36, and ratchet-wheel 37, when an alternating- current is passed through the coils 9. A similar armature 35<1> actuates the arm 37<1> of a bell-clapper 38, the operation of which is controlled by a gravity latch 41 having a slit 53 and curved end 55, and adapted to engage a projection 45 on the arm 37<1> and lock the arm against movement. When the notch 29 in the selecting-wheel 27 registers with the projection 25, and current is cut off from the coils 9, a pin 50 on a pivoted arm 48 carried by the lever 15 slides over the latch 41 and drops to a position beneath the end 55. On the armature 17 being attracted, the pin 50 lifts the latch 41, releases the clapper - arm, and allows the bell to sound. When the armature is again permitted to drop, the pin 50 passes through the slit 53, and the gravity latch drops to the locking position. To enable a number of similar electro-magnetic devices at different stations on a single line to be always set in rotation from the same zero point, the lever 15 is provided with a loosely pivoted finger 60, which normally rests obliquely upon a suitable support. When a finger 64 fixed to the shaft of the selecting- wheel 27 completes one revolution from its position indicated in Fig. 4, the armature 17 being in the attracted position, it engages the finger 60 and pushes it into an upright position, where it is stopped by a lug on the arm 61. The motion of the ratchet-wheel 37 is thus arrested, until a cessation of the current permits the lever 15 to drop ; on the re-establishing of the current, the finger 60, having swung outwards by gravity, comes up behind the finger 64, as shown in Fig. 4, and thus allows another revolution of the ratchet and selecting wheels to take place. Fig. 6 shows a series of sub-stations A, B, &c. connected with a central station D and " grounded " through condensers 73. The notches 29 of the selecting- wheels 27 are differently located at each station. Alternating-currents sent from the central station actuate the selecting-wheels until the notch 29 of the desired station registers with the projection 25 on the lever 15. A cessation of current allows the armatures 17 to drop, but, at the station to be called, the notch 29 permits a sufficient drop to carry the pin 50 below the shoe 55.' A resumption of the current then causes the bell to sound owing to the vibrations of the armature 35'. When the current is again cut off, the bell-lever is locked by the gravity latch 41, and all the parts are restored to the normal position.