| 摘要 |
549,167. Wheels for roller skates ; bearings. HOFFMANN MANUFACTURING CO., Ltd. Aug. 29, 1941. No. 11052. Convention date, Dec. 28, 1940. [Classes 12 (i) and 144 (i)] A wheel for roller skates and the like comprises a removable tyre secured in position by clamping means which form a housing for a bearing assembly including inner and outer race members. As shown in Fig. 1, an annular tyre 10 of wood is clamped between bevelled shoulders 11, 12 on screwed sleeves 13, 16 which also secure resiliently a ballbearing 18, 19 by means of a spring ring 24 of metal or rubber. Annular shields 22 prevent escape of lubricating grease or entrance of dirt. In a modification, Fig. 5 (not shown), a screwed ring independent of the screwed sleeve 16 is used to secure the ball bearing. As shown in Fig. 6, two ball bearings are used and the abutting sides of their inner races are ground off so that the angles of contact or pressure on the bearings when clamped together are in the directions shown by the broken lines 32, 33. The two bearings may be spaced apart.
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