GB120876A - Electrical Control of Gun Movements. - Google Patents

Abstract

120,876. Soc. Anon. Italians. G. Ansaldo & Co. July 18, 1917, [Convention date]. Void [Published under Sect. 91 of the Act]. Mountings.-Relates to electric elevating or training gear which can be operated by hand if the power fails, and consists in connecting the hand-wheel through an elastic clutch and a differential gear to a resistance regulating the action of the driving motor in such a way that, when the motor is working, no power is transmitted from the hand-wheel through the clutch, but as soon as the motor fails, a direct drive is obtained through the clutch. The invention is shown applied to the training gear. Fig. 1 shows an electric motor 5 mounted on the revolving gun pedestal 1 and driving a worm shaft 4 engaging a fixed worm wheel 3. The motor, which is shunt wound, receives current, through brushes 27 moving over contact rings 26, from a direct-current dynamo 23 driven at constant speed by a motor 24 connected with the mains 25. The dynamo 23 has double field coils 23, 23<2> for reversing the motor 5 according to the position of a switch arm 17 with respect to a rheostat 16 which regulates the action of the driving motor 5. This switch, which is of the hunting type, is actuated by a hand-wheel 8 through a yielding clutch and differential gear mounted in thei box 9 shown in detail in Fig. 2. The hand-wheel 8 is carried on a short shaft keyed to a sleeve-casing 15 having projections 15<1>, 15<2>, Fig. 3, which, according to the direction of rotation of the hand-wheel, act on one or the other of two disks 12, 13 freely mounted on the shaft 4 and connected by a torsion spring 14 which tends to return the hand-wheel to mid position. The disks 12, 13 carry projections 12<1>, 13<1> each working with lost motion between stops on disks 10, 11 keyed to the shaft 4. When the driving motor 5 is working, the yielding of one or the other of the disks 12, 13 causes differential movement of the wheels 19, 18 of the epicyclic gear 19, 18 20, and rotates the pinion 20 and switch arm 17 which are mounted on the same shaft. If the driving motor fails, the lost motion of the disks 12, 13 relatively to the disks 10, 11 is taken up, and the hand-wheel 8 positively drives the shaft 4, the pinion 20 and therefore the switch arm, remaining fixed. The switch arm may be operated directly by a handle x if desired.