Patent GB-410820-A (GB)
Title: Apparatus for controlling the displacement of stabilizing masses on ships, particularly applicable to the fluid masses of anti-rolling tanks
IPC: B63B39/03
Filed: 1932-11-21
Abstract: 410,820. Minimizing rolling of ships. GES. FUR ELEKTRISCHE APPARATE, 44, Wilhelm v. Siemensstrasse, Marienfelde, Berlin. Nov. 21, 1932, No. 32890. Convention date, Nov. 20, 1931. [Class 113 (i).] In means for minimizing the rolling of ships in which fluid or solid masses are displaced athwartship, two separate groups of controlling- means are provided one of which effects the reversal of the drive and the second group regulates the output of the drive. The invention is described with reference to its application to the case where the supply or withdrawal of water to and from the side tanks 1, 2, which communicate at the bottom with the sea, is activated by the continuously-running blower 10 the pressure and suction conduits 8, 9 of which are connected up through the oscillating two-way cock 7 and the conduits 5, 6 with the main conduit 3 connecting the tanks 1, 2 on opposite sides of the main shut-off valve 4. The oscillation of the cock 7 is effected through rack-gear 19, 20 by the oscillation of a common piston rod 18 of pistons working in the cylinders 16, 17 which are alternately connected up to fluid supply and suction by the oscillation of pistons 15<1>, 15<11>, 15<111> in the cylinder 15. The oscillation of the pistons 15<1> -15<111> simultaneously alternately activates and releases pressure cylinders 11, 12, whose pistons alternately control the direction in which the main shut off cock 4 can swing. The pistons 15<1>-15<111> are reciprocated in accord with the roll of the ship through the alternate activation of solenoids 23, 24 the cores of which are connected up with the pistons 15<1>-15<111> through the bell-crank levers 21. The alternate activation of the solenoids is effected from the shaft 28 which is oscillated in accordance with the roll of the ship through the lightly-controlled damping arrangement 27 the shaft 43 and the arm 25 which swings over to make contact with the disc 26. This control therefore secures the alternate supply and withdrawal of air from the tanks 1, 2 through the reversal of the two-way cock 7 and the sudden equalization of pressure in the tanks on reversal of roll by the swinging- over of the main valve 4 through the simultaneous reversal of the pressures in the cylinders 11, 12. The output of the drive is regulated by the throttling member 36 in the conduit 3 which is connected by a lever system with the core 401 of a solenoid 40 which is connected through a voltage divider 42 arranged in combination with the shaft 28. The core 40 is connected with the piston 41 controlled by a spring 411 in the hydraulic cylinder 39. Checkvalves 41<11> in the piston allow the piston and with it the core to move into the solenoid an amount proportionate to the angle of roll. The withdrawal of the piston by the spring can only take place by the flow of fluid through the throttled byepass 39<1>. The throttle-valve 36 is therefore open for a period proportionate to the magnitude of the angle of roll. The same end may be achieved by throttling the output of the blower or by regulating the speed of the pump or the motor driving the pump. The motion of the shaft 28 is conveyed through shafts and bevel-gearing 32, 33, 34 and the heavily controlled damping arrangement 31 to the disc 26 which thus takes up a position relatively to the arm 25 proportionate to the list of the ship.