Patent GB-308779-A (GB)
Title: Concordance restoring device for electric distant control systems
IPC: G08C19/38
Filed: 1929-02-01
Abstract: 308,779. Granat, E., and Compagnie des Forges et AciÚries de la Marine et d'HomÚcourt. March 30. 1928, [Convention date]. Addition to 300,608. [Class 38 (iii), Electric motor control systems &c.]. Mountings. - In distant-control arrangements for moving guns &c. where auxiliary devices are provided for correcting accidental lag or lead of the controlled motor reference, to the distant transmitter, as described in the parent Specification, modifications are made with the object of applying the correcting action at a rate depending on the amount of lag or lead, of allowing additional corrections to be introduced, and of allowing backward and interrupted movement when necessary: for example, if a gun while it is being trained reaches the limit of the firing zone and is, in consequence, unclutched from the training motor. The desired effects are obtained bv suppressing the relay in the corresponding circuit and replacing the simple hunting-switches by commutator rings moving over tapping contacts connected to corresponding tappings of a ring- wound transformer, and furthermore by arranging this transformer to serve as an additional transmitter and by providing for the reversal of the main controlled motor before being reclutched to the gun. Fig. 4 is a simplified diagram of the whole arrangement. A transmitter T1 at the control station manipulated by a hand-wheel 104 sets a receiver R1 associated with a relaying motor-transmitter T in known manner. The transmitter T has synchronizing connections to a receiver motor R driving a gun P and also to a receiver motor R2 driving a sighting telescope L. The. correction for lag or lead is taken from an auxiliary transmitter TA driven off the telescope gear and having synchronizing connection with three differently-speeded auxiliary receivers G, M, F, which move commutator rings 181, 182, 188, replacing the hunting-switches of the parent Spccirication. The commutator segments are connected respectively to tappings of a ring-wound transformer V, and thus introduce a voltage depending on the amount of lag or lead into the circuit, of the correcting motor S, which is related to the main receiver motor R in the same manner as in the parent Specification. A hand-wheel 160, which can rotate feeding- brushes so as to vary the potentials tapped off from the transformer V, enables additional corrections to be impressed on the gun by way of the motor S. Switches K, N allow the motor S, R to be fed from adjacent single-phase mains in case of failure of the distant control. Limit switches B1, B2 in series with an electromagnet operating a clutch 14 between the gun and the motor R prevent the gun from following the telescope beyond the firing zone. A reversing- switch 83 for the motor S is rotated by a receiver motor 88 in synchronous connection with the telescope gear, and is disposed so that the reversal happens at the moment when the telescope re-enters the firing zone, the clutch 14 being simultaneously re-engaged. The result is that the gun moves back until it picks up the telescope again. The system may be further complicated by inserting differential or additive transmission devices resembling those described in Specification 260,579, [Class 38 (iii), Electric motor control systems &c.].