| 摘要 |
Disclosed is a bracket angle adjustment mechanism adapted to reduce shock to be given to a wedge member, based on an improved wedge shape. The bracket angle adjustment mechanism comprises a pair of wedge members ( 16 A, 16 B). In each of the wedge members ( 16 A, 16 B), an arc-shaped outer surface ( 16 a) has a diameter slightly less than that of an arc-shaped inner peripheral surface of a large-diameter hole ( 14 c) of an external-tooth gear ( 14 ), and an arc-shaped inner surface has a diameter slightly greater than that of an arc-shaped outer peripheral surface of a small-diameter shank ( 15 c) of an internal-tooth gear ( 15 ). The arc-shaped inner surface ( 16 b) has a circumferential length approximately equal or greater than that of the arc-shaped outer surface ( 16 a).
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