| 摘要 |
A ratchet (14) with a handle (16) and a head (12) that includes a substantially silent movement-prevention mechanism (10). The mechanism (10) includes a first component (26) that defines a path (28), and a second component (30) that is locatable in the path (28) and moves bidirectionally within it. The path (28) is constructed to include plural regions (40) that prevent movement by the second component (30) to allow the ratchet (14) to drive a desired fastener. The first component (26) is constructed to define a path (28), or plural paths (42), with a central region (38) that allows movement of the second component (30) and outer, opposing regions (40) that prevent movement of the second component (30). The second component (30) is formed as a roller or plural rollers. The central region (38) of the path (28) includes a subregion (68)constructed to position the second component (30) in a beginning location in the central region (30). The subregion (68) may be formed as a depression in the path (28). |
