GB932457A - Improvements in gyroscope apparatus - Google Patents

Abstract

932,457. Twin-sensitive devices employing vibrating masses. MINISTER OF AVIATION. Oct. 23, 1961 [July 21, 1960], No. 25435/60. Class 97 (3). A twin-sensitive device has two oscillatory bodies A, B, Fig. 2, on a torsion bar T1 mounted on a support frame F which is itself mounted to form an oscillatory body with another body C on torsion bar T2 at right-angles to bar T1, the . natural frequency of oscillation of bodies A, B about the axis Z of bar T1 and composite body ABFT1 and body C about the axis Y of bar T2 being equal to one another. The arrangement is such that if one pair of bodies is oscillating about its respective axis deflection of the whole device about axis of sensitivity X at right-angles to axes YZ causes oscillation of the other pair of bodies about its particular axis. The fixed framework MF is secured, or joins, bar T2 at points which are effectively nodal points in its length when bodies FABT1 and C are in anti-phase oscillation. Similarly, the points at which bar T1 joins or is secured to the frame F corresponds to nodal points in its length when the bodies A and B are in antiphase oscillation. In a modification the body C is in the form of an open frame surrounding the composite body FABT1 and joining a twosection torsion bar T2 which is supported on a main frame at two nodal points in its length at opposite sides of body FABT1. In a further form, Fig. 4, the bodies ABFT1 are on opposite sides of a main frame MF and the frame F is in the form of a two tine fork, the bodies A, B being at right-angles to bar T1 and such that bar T2 bisects the angle between them. The axis of sensitivity in this embodiment coincides with axis Y. The various members may be machined from a single piece of material.