Improvements in or relating to electrical timing arrangements


341,801. Electromagnetic relays. TELEFONAKTIEBOLAGET L. M. ERICSSON, 33, Kungsgatan, Stockholm.- (Assignees of Blomberg, K. H. ; 39, Lokattsvagen, Appelviken, Sweden.) April 14, 1930, No. 11803. Convention date, April 15, 1929. [Class 38 (v).] In a time relay, in which the delayed action is caused by the charging of a condenser C<1> through a high resistance r<1> from a source E, the condenser C<1> during its charging is connected in series with one or more condensers C<2> which have previously been charged from the same source, the arrangement being such that when their added voltage exceeds the operating voltage of a discharge device G, a discharge takes place through this and the coil R<2> of the relay. By this means a source E may be used of lower voltage than the operating voltage of the device G. In the arrangement shown in the Figure, the condenser C<2> is normally connected across the source E and charged to its potential. On energizing a coil R<1>, contacts 1, 2 are opened and contact 3 closed. The condenser C<1> is thus connected across the source and charges up slowly through the resistance r<1> till the relay R2 is operated. The relay R<2> may operate a contact 4 which maintains a circuit through it until the coil R<1> is deenergized. Two condensers C<2>, normally connected in parallel to the source E, may be used (Fig. 2 not shown) or more than two may be used. If desired, the arrangement may be such that the condenser or condensers C<2> are only connected to the source E just before the timed action commences.




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