GB835692A - Staff call system - Google Patents

Abstract

835,692. Electric selective signalling; monogrammic signs. PHOENIX TELEPHONE & ELECTRIC WORKS Ltd. June 14, 1956 [March 14, 1955], No. 7395/55. Classes 40 (1) and 118 (2). A staff call arrangement whereby a member of the staff of a factory for example may be called by a signal displayed in each department consists of a keyboard having ten keys the contacts of which select a combination of four transmission lines A, B, C, D, Fig. 1, connected at each receiving point to four relays, the contacts of which are connected to select the appropriate one of ten lines to energize a visual indicator indicating the number of the member. of the staff required. In the form described there is a keyboard for the tens digit of the number and one for the units digit, four lines and four relays for each digit and an array of lamps A, B, Fig. 6, for each digit. Lamps are lit in each array to form the shape of the appropriate digit. In another form the selection of the lamps is effected by a rotatable controller driven by an electric motor and having a gapped contact ring co-operating with ten brushes. The incoming signal is applied to one of the brushes, the motor thus being caused to stop in the position where the.gap in the ring registers with the energized brush, contacts on the controller then being closed to light the required lamps in the indicators.