| 摘要 |
A rotary adjuster, such as for a vehicle seat having a seat back rotable relative to a seat bottom, includes a first member defining first and second cam surfaces. A second member is rotatably mounted relative to the first member about an axis. The second member defines third and fourth cam surfaces. The third cam surface faces the first cam surface and defines a first gap therebetween. The fourth cam surface faces the second cam surface and defines a second gap therebetween. A first wedge element is disposed in the first gap so as be selectively movable between a wedged position engaging the first and third cam surfaces to prevent rotation of the second member relative to the first member in a first rotational direction, and a free position permitting movement of the second member relative to the first member. A second wedge element is disposed in the second gap so as to be selectively movable between a wedged position engaging the second and fourth cam surfaces to prevent rotation of the second member relative to the first member in a second rotational direction opposite the first rotational direction, and a free position permitting movement between the second member relative to the first member. An actuation mechanism responsive to a radially directed force for moving at least one of the first and second wedge elements from the wedged position to the free position, thereby allowing the rotational position of the second member to be adjusted relative to the first member.
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