| 摘要 |
945,974. Ball castors. J. COLLIS & SONS Ltd. March 4, 1960 [March 6, 1959], No. 7902/59. Heading A4U. [Also in Division F2] A ball castor comprises a body 1 having a part spherical recess 2 which carries a number of small balls 4 forming a bearing for the castor ball 3. The castor ball is held in place by a cover 9 screwed into the body, and the space between the ball and the body is sealed by a washer 7 and seals 5 and 10.
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