| 摘要 |
1,188,578. Aerials. W. H. PETERSON. 7 Aug., 1967 [9 Aug., 1966], No. 36107/67. Heading H4A. [Also in Divisions F2 and G2] A pivotal mounting for heavy instruments such as reflecting telescopes or radio telescopes comprises a spherical instrument carrying member 1 freely rotatable about two mutually perpendicular axes 6 and 7 in a load-bearing, partspherical support socket 4, the axes 6 and 7 lying in a predetermined plane and being defined by non-load bearing adjustment means engaging member 1. The adjustment means consists of an orientation ring 2 which is slidable through an arcuate socket 5 in support 4 to give rotation about axis 7, and which has pivots 3 engaging the member 1 to define axis 6. Worm-gears drive teeth formed in ring 2 and in the sphere 1 to give controlled rotation about axes 6 and 7. An alternative pulley and cable drive is suggested. Sphere 1 rests on a fluid support of liquid or gas or on mechanical castor bearings, within socket 4. In one liquid flotation form of mounting giving universal pivoting about three mutually perpendicular axes, the socket 5 is movable to vary the elevation of ring 2 by means of a further worm and gear mechanism which itself rotates about a vertical axis on a turntable. |
