Rotary selector adapted to scan a line multiple in a step-by-ste

Details Rotary selector adapted to scan a line multiple in a step-by-ste Rotary selector adapted to scan a line multiple in a step-by-ste

1979-01-17

1980-06-10

Brown, Thomas W.

H04Q 314

Patent

active

042074380

ABSTRACT:
A rotary line selector of a telephone exchange has a wiper, connected to a test wire, coacting with a multiplicity of bank contacts divided into ten decadic groups that are separated by rest positions in which the wiper may come to a halt after selection of a decadic group by the penultimate digit of a call number, the selector being then driven in response to the final digit to choose one of the ten outgoing lines whose test wires are tied to respective bank contacts of that group. If the called subscriber can be reached through a line multiple, selection of the first line--if the latter happens to be busy--brings on an ancillary relay X which connects a previously charged capacitor C in a sensing circuit including a common lead tied to the test wires of all the other lines of the multiple, operation of another ancillary relay V' then actuating a driving relay V for resumption of selector rotation while switching a test relay P from the wiper to the sensing circuit. When another line of the multiple. is found to be free, test relay P halts the selector wiper on the bank contact of the last-mentioned line with release of ancillary relays X, V' and of driving relay V. If none of these lines is free, the wiper is arrested on a further bank contact connected directly to the common lead.

REFERENCES:
patent: 2093242 (1937-09-01), Humphries et al.
patent: 2581699 (1952-01-01), Pearce et al.
patent: 2667541 (1954-01-01), Beale et al.
patent: 2761904 (1956-09-01), Mauge
patent: 2857471 (1958-10-01), Kaye
patent: 3634629 (1972-01-01), De Marco

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