| 摘要 |
<p>The cylindrical element (1) has two parallel positioned bores (2) for the accommodation of the outer ends of the chain (3) or string and one bore (4) arranged crosswise to the first and fitted with two helical springs (5) acting on two small balls (6) with their inner ends (7). The unit (1) is covered by a flat cylindrical lid with holes for the insertion of the chain or string (3). The unit can be slid along the chain or similar device (3) in order to serve as a locking element at the appropriate position.</p> |
