| 摘要 |
The setting disc has a rotatable element (11) and a cooperating ratchet for securing it in a number of ratchet positions, provided with a setting element (14) wth a number of openings (14a,..14p) corresponding to the ratchet positions. At least 2 balls (24a,24b) are pressed against the setting element for engaging in the openings, such that one ball is disloged when the other ball fits into an opening. |
