| 摘要 |
<p>A rotation device to permit, and lock rotation of a first part relative to a second part, said device comprising: a first shaft (3) to be connected to the first part (1) and having a spring engaging portion (3a) second shafts (4, 5), both to be connected to the second part (2) and being located either side of said portion (3a) of said first shaft (3) a coil spring (6) wound closely around said second shafts (4, 5) and around said portion (3a), so as to restrain relative rotation therebetween.</p> |
