| 摘要 |
957,206. Bobbins. P. PORTAL. Jan. 24, 1961 [July 16, 1960], No. 2711/61. Heading B8M. A bobbin comprises a tube 4, flanges 1, 2 screwed on to the tube 4 and washers 5 of prestressed material placed between the flanges and the tube to fill any gap produced there between by wear. Preferably, the washers 5 are of a material having a basis of synthetic textile fibres. |
