Gyroscopic apparatus

• US 4,258,577 A
• Filed: 02/23/1979
• Issued: 03/31/1981
• Est. Priority Date: 02/27/1978
• Status: Expired due to Term

• Current Assignee: British Technology Group Ltd.
• Original Assignee: National Research Development Corporation
• Inventors: Burdess, James S., Fox, Colin H. J.
• Primary Examiner(s): Bonck, Rodney H.
• Application Number:
  US06/014,531
• Time in Patent Office: 767 Days
• Field of Search: 74/5.6 D, 74/5.6 R, 74/5 R, 73/495, 73/504, 73/505, 73/517 AV, 73/517 A
• US Class Current: 74/5.60R
• CPC Class Codes: G01C 19/5642 using vibrating bars or beams
• CPC Class Codes: Y10T 74/12 Gyroscopes
• CPC Class Codes: Y10T 74/1261 with pick off
• CPC Class Codes: Y10T 74/1275 Electrical

Abstract

A gyroscope in which sprung elements are supported in cantilever fashion from a rotor and extend in a generally inward direction towards the rotor axis. The centers of mass of the elements are out of alignment with the rotor axis and the elements are free to vibrate in directions parallel to that axis. The output of the gyroscope is derived from detection of these vibrations.

Claims

1. Gyroscopic apparatus including:

a drive member, adapted to rotate about a drive axis;

a sensitive element attached to said drive member,

said sensitive element comprising a sprung mass system including spring members and having its centre of mass offset from said drive axis, said spring members extending away from the points of said attachment of said sprung mass system to said drive member in directions having a radially-inwards component relative to said drive axis and being free to permit vibration of said element in a direction parallel to said drive axis, and

means to detect said vibration and convert it to gyroscopically-useful signals.

2. Gyroscopic apparatus according to claim 1 in which said spring members are supported as cantilevers from said drive member, and in which the fixed and free ends of said cantilevers lie to opposite sides of said drive axis.

3. Gyroscopic apparatus according to claim 1 in which said spring members are supported as cantilevers from said drive member, and in which the fixed and free ends of said cantilevers lie to the same side of said drive axis.

4. Gyroscopic apparatus according to claim 1 in which said mass of said sprung mass system is that of said spring members themselves.

5. Gyroscopic apparatus according to claim 1 in which said spring members carry added masses.

6. Gyroscopic apparatus according to claim 5 in which said spring members are light so that substantially the whole of said mass of said sprung mass system is due to said added masses.

7. Gyroscopic apparatus according to claim 1 in which said drive member is balanced by carrying masses at points which, relative to said drive axis, lie diametrically opposite to points of said attachment of said sensitive element to said drive member.

8. Gyroscopic apparatus according to claim 1 in which said sensitive element mass system is attached to said drive member at a plurality of peripheral points, so that said centre of mass of said sprung mass system lies within said periphery.

9. Gyroscopic apparatus according to claim 1 in which said sensitive element comprises a mass connected to said drive member by said spring members extending in opposite radial directions relative to said drive axis.