Patent GB-108949-A (GB)
Title: Improvements in or relating to Electric Selectors.
Inventor: OULIANINE SERGE
IPC: H04L25/04
Filed: 1916-10-20
Abstract: 108,949. Oulianine, S. Oct. 20, 1916. Electric selectors.-The selecting-element is moved to its operative positions by a varying number of short current impulses, and the selected circuit is closed by a long impulse, upon the cessation of which the circuit is opened and the selecting-element is returned to its normal position. In the arrangement shown in Fig. 1, a ten-segment commutator 24 is driven in a step-by-step manner, against the action of a spring 25, by means of a ratchet-wheel 14 and pawl 19 pivoted to the armature 18 of a magnet 17. The commutator is retained in its operated position by means of a latch 37. In parallel with the operating-magnet 17 is a magnet 6, the pivoted armature 5 of which carries a disk 3 normally held away from a continuously rotating disk 2 by means of a spring 9. The armature 5 also carres a catch 8 adapted to be engaged by a pin 7 on the disk 3, which carries a contact 11 adapted to engage a fixed contact 12 when the pin 7 engages the catch 8. When the operating- circuit 10 is supplied with short impulses, the commutator 24 is stepped around by the action of the magnet 17, but the engagement of the disks 2, 3 is not sufficient to allow the contact 11 to engage the contact 12. When, however, a long impulse is sent to the circuit 10 after a predetermined number of short impulses, the selected circuit 13 is closed at the contacts 11, 12 and a magnet 15 is energized. The energization of the magnet 15 causes its armature 16 to disengage a retaining-pin 26 on a cam 22 and cause it to engage, upon a slight rotation of the cam, a pin 27. At the cessation of the long impulse, the disks 2, 3 are disengaged, whereby the selected circuit is de-energized. The de-energization of the magnet 15 causes the armature 16 to disengage the pin 27, and the cam 22 is allowed to rotate until the armature 16 engages a pin 26<1>. The rotation of the cam 22 raises the operating- end of the pawl 19 and the retaining-latch 37, thereby allowing the commutator 24 to return to its normal position under the action of the spring 25. The disk 2 and the cam 22 may be frictionally mounted on the same shaft, and the cam provided with more than two cam-surfaces and two sets of retaining-pins. In the modification shown in Figs. 3 and 4, the commutator 24, together with a pin plate 30, are frictionally mounted on a continuously rotating shaft o<1>, while the cam 22 and disk 2 are mounted on a continuously rotating shaft 1. The intermittent motion of the commutator 24 and pin plate 30 is obtained by the periodic energization of the magnet 17, the armature 18 of which carries a spring 28 provided with a catch 35 adapted to engage a staggered set of pins 31 on the plate 30. The spring 28 is also provided with a rod 36, the lower end of which engages the arm 33 of a spring-controlled bellcrank lever 33, 34, the arm 34 of which engages the cam 22. The arm 33 is adapted, in its raised position, to engage a pin 32 on the lower face of the plate 30. With the cam 22 and lever 33, 34 in the position shown, the periodic energization of the magnet 17 by short current impulses allows the shaft o<1> to rotate the commutator 24 intermittently until the desired contact Z is under its spring contact 29. A long impulse then closes the selected circuit and controls the motion of the cam 22 in the manner shown in Fig. 1. When the long impulse ceases, the cam 22 rotates, thereby allowing the lever 33, 34 to disengage the catch 35 from ihe pins 31, and the commutator is rotated to its normal position by the engagement of the arm 33 with the pin 32.