GB720220A - Improvements in or relating to gyroscope apparatus - Google Patents

Abstract

720,220. Gyroscopic apparatus. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Feb. 25, 1953 [June 20, 1952], No. 15631/52. Class 97 (3). [Also in Groups XXXV and XXXVII] In a gyro-vertical having a pitch torque motor and a roll torque motor respectively operated by switches that are responsive to pitch and roll, and having roll switch means which automatically disconnect the roll torque motor when displacement of apparent gravity in roll exceeds a given amount, additional roll switch means connect the roll torque motor to the pitch switch when displacement of apparent gravity in roll exceeds said given amount. The gyro-vertical shown has a pitch torque motor 15 controlled by a mercury pitch switch 14 carried by inner gimbal 12 and a roll torque motor 18 normally controlled by a mercury roll switch 17 on the outer gimbal 13. Gimbal 13 also carries additional mercury roll switches 19, 20 connected between the pitch switch 14 and the roll torque motor 18. Normally any roll is detected by roll switch 17 and torque motor 18 is energized thereby, switches 19, 20 being open; but, in turns exceeding a certain rate, switch 17 opens due to the mercury bubble 30 leaving supply electrode 26. As soon as this happens one of the switches 19, 20 is closed to connect the roll torque motor 18 with the current source 23, 27 via the pitch switch 14.