| 摘要 |
A carrier body 10 comprises a plate 13 having a bore 14 for pivotally mounting the body, a curved slot 15 which is centred on the bore 14 for receiving a securing element and limiting the range of pivotal movement, and an upstanding projection 21 which is for supporting a pulley body 12. To allow improvements in manufacture, weight and resistance to corrosion compared to metal carrier bodies, the carrier body 10 is made of plastics and has upstanding reinforcing ribs 17. <IMAGE>
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