| 摘要 |
An apparatus ( 10 ) includes first and second plates ( 44 and 84 ) extending parallel to each other and movable relative to each other. A locking mechanism ( 140 ) prevents movement between the first and second plates ( 44 and 84 ). The locking mechanism ( 140 ) has a first position applying a force to urge the first and second plates ( 44 and 84 ) toward each other to prevent movement between the first and second plates. The locking mechanism ( 140 ) has a second position to permit relative movement between the first and second plates ( 44 and 84 ). A surface treatment on one of the first and second plates ( 44 and 84 ) and between the first and second plates resists relative movement between the first and second plates when the locking mechanism ( 140 ) is in the first position. The surface treatment lubricates relative movement between the first and second plates ( 44 and 84 ) when the locking mechanism ( 140 ) is in the second position.
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