| 摘要 |
A pivot mechanism includes a pivot arm (14) that is rotatably mounted on a base member (1) via a pivot pin (16). The pivot mechanism includes a locking mechanism comprising a convex tooth segment (36) provided on the pivot arm and a locking member (38) having a concave tooth segment (40). The locking member (38) is mounted on the base member (1) for movement between a locked position in which the convex and concave tooth segments are engaged preventing rotation of the pivot arm (14), and an unlocked position in which the tooth segments are disengaged. The center of curvature of the convex tooth segment (36) is offset from the center of curvature of the concave tooth segment (40) whereby, in normal usage, the convex and concave tooth segments are only partially engaged when the locking member is in the locked position.
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