| 摘要 |
A ratchet with a handle and a head that includes a substantially silent movement-prevention mechanism. The mechanism includes a first component that defines a path, and a second component that is locatable in the path and moves bidirectionally within it. The path is constructed to include plural regions that prevent movement by the second component to allow the ratchet to drive a desired fastener. The first component is constructed to define a path, or plural paths, with a central region that allows movement of the second component and outer, opposing regions that prevent movement of the second component. The second component is formed as a roller or plural rollers. The central region of the path includes a subregion constructed to position the second component in a beginning location in the central region. The subregion may be formed as a depression in the path.
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