Patent GB-653896-A (GB)
Title: Improvements relating to the electrical control of counting and changing display apparatus
IPC: H04M3/64
Filed: 1948-10-15
Abstract: 653,896. Counting-apparatus; transfer mechanism. SIEMENS BROS. & CO., Ltd., and HAILEY, A. M. Oct. 15, 1948, No. 26918. [Class 106 (i)] [Also in Group XVIII] In a counting arrangement employing a pulsed switch having a plurality of contact positions the number of pulses to be counted in a single traverse of all its contacts by the switch exceeds the number of said contacts and the excess pulses are absorbed by a device which effects a change of count without movement of the switch. As shown in Figs. 1 and 2, the invention is applied to a secondary clock, the relay TP of which receives impulses from a master clock every half-minute. The impulses are registered or counted by a registering switch comprising four standard double banks of twenty-five contacts and associated wipers md1, md2, md3, md4 normally stepped-on in known manner by a magnet MD. As it is desired to register or count sixty impulses during a complete sweep of the wipers every fifth contact in the bank of wiper md1 is connected via contacts as shown in Fig. 1 to two relays A and B. On the receipt of the fifth impulse and every sixth thereafter relay TP is operated, as usual, and a circuit via the wiper md1, contact 4 or 9 or 14 &c., back contact b1 to the upper winding of relay A is established. Relay A operates and at contact a1 prepares an operating circuit for relay B and at contact a2 opens the holding circuit for relay TP which releases, contact tp1 opens, relay B operates in series with the upper winding of relay A, contact b1 disconnects relays A and B from the bank of wiper md1 and connects the appropriate contact 4, 9, 14, 19, 24, 30, 35, 40, 45, 50 to the magnet MD, contacts b2, b3 close and no stepping of the registering switch takes place. The next impulse is directed to the magnet MD and the registering switch is stepped on in the normal manner. Wiper md2 and associated contacts are connected to corresponding contacts of a lining-up switch mum, Fig. 2, which, as described in Specification 358,895, operates a minutes " units " indicating band. The wiper md3 and associated contacts are connected to appropriate corresponding contacts of a lining- up switch mtm, Fig. 2, which controls a minutes " tens " indicating band. Contacts 2, 7, 12 &c. of the bank of the wiper md4 are commoned and connected via make contact b3 of the relay B to relay A. Contacts 49, 50 in this bank provide for the operation and release of relays C and D. The contact O of this bank is connected via contacts of relays C and D to a transfer relay TH for operation thereof at the end of each hour. The " hours " registering switch comprises the magnet HD and two double-ended wipers hd1, hd2 and associated bank contacts interconnected and connected to the contacts of the hours " units lining-up switch hum, and the hours " tens lining-up switch htm respectively, Fig. 2. In a modification, when impulses are received from the master clock every minute and a change of display is to be made for every impulse the bank of contacts of wiper md2 are arranged as shown in Fig. 3 and contacts b4 and b5 of the relay B are arranged to effect a stepping-on of the lining - up switch MUM, Fig. 2, for the " absorbed " pulses.