| 摘要 |
A rotatable camplate (4) is connected to aframe part (1) or, alternatively, to a pivot arm (3) at a distance from a pivot point (2) of the latter. Its periphery has a spirally-shaped curve about its rotation axis (5). - The pitch of the spiral is adjusted to obtain a friction locking of the plate when its periphery supports against either the frame part of the pivot arm. |
