Patent GB-191201965-A (GB)
Title: Improvements in Apparartus for the Control of Electric Circuits.
Inventor: LEITNER HENRY
IPC: H02J7/34
Filed: 1912-01-24
Granted: 1913-01-23
Abstract: 1965. Leitner, H. Jan. 24. Lighting systems; regulation, automatic systems and apparatus for.-In train-lighting and like systems, of the kind described in Specifications 21,145/04, 25,784/04, and 6690/06, in order to prevent the battery from being overdischarged, the coil f, Fig. 1, of the volt-meter control has in circuit with it retrogressive resistances s, which, upon break of circuit by the travel of the resistance arms c to the left, are re-inserted together with a resistance t. The arm is driven to cut in or out resistance d by means of a motor g controlled by contacts n, n<1> on the volt-meter, and trigger limit switches h, h' break the motor circuit at each end of the travel. A trigger switch l also breaks the circuit of the volt-meter when the arm has cut in all the resistance. The invention refers principally to the method of making and breaking the circuits of the lamps and volt-meter at the left hand, i.e. the ' no resistance ' end, of the rheostat. In the form shown, gaps o, q are provided in the contacts p, r, and respectively break the volt-meter and lamp circuit after the arm has been moved to the ' off ' position. The lamp circuit is broken for each direction of travel, after the circuit of the volt - meter has been broken. This is effected by means of a loose contact which lags behind the fixed contacts on the arm. In operation, assuming the dynamo a is not working and that the battery b alone is supplying the lamps the main switch i for which is closed, the position of the arm e on the resistance d will be determined entirely by the voltage of the battery operating the meter f and, through it, the motor g. Upon great reduction of voltage of the battery, the arm will be moved on to the extreme left contacts, and the volt-meter circuit can then only be remade by means of a push switch h, which shortcircuits the gap o between the contacts p, p<1>. After the switch z has been closed, if the voltage of the battery is sufficient to move the arm e so as to complete the volt-meter and lamp circuits, the battery is cut in again for a time dependent upon the extent to which the charge has been renewed. An additional wire w connects the contact p<1> with a contact x on the automatic cut-in and cut-out dynamo switch y enabling voltage to be applied to the meter f as soon as the dynamo is again working. A contact v may be connected with a coil operating an automatic release for the main lamp switch; or a separate switch may be used for this purpose operated by the arm e. In a modification, the arm e, Fig. 3, after falling to its left-hand limit, energizes from the contact v the coil i' of the main lamp switch, breaking the lamp circuit at k and short-circuiting the resistance s at the contacts k<1>, k<2>. Owing to the elimination of the resistance s, the slight recovery of voltage due to open-circuiting the battery energizes the volt-meter coil sufficiently to start the motor. The arm e is thereupon driven direct to the full-resistance position, in which it breaks the motor circuit at the switch h<1> and also the volt-meter circuit at the switch l. In the parallel working of dynamos or batteries, or of lamp circuits each with its own regulator, an extension of the wire may be taken to the additional regulators, to reestablish their circuits together. This arrangement is stated in the Provisional Specification to be applicable to the system described in Specification 27,396/10, [Class 38 (v), Electric switches &c.].