| 摘要 |
1,206,372. Bearings. SIEMENS A.G. 17 May, 1968 [16 June, 1967; 16 Nov., 1967], No. 23727/68. Heading F2A. A footstep ball bearing has a ball 2 disposed between two bearing bushes, one of which, 3, has a concave bearing surface having a radius of curvature greater than that of the ball, and the other 44 having a pyramidal bearing surface. The bushes are of plastics material, and the pyramidal surface is triangular.
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