| 摘要 |
An adjustable wrench has a ratcheting feature by which its movable jaw retracts away from its fixed jaw when the handle is pulled in one direction, enabling the wrench to slip over the facets of a polygon-shaped nut, but which locks the jaws in position when the wrench handle is turned in the opposite direction. A jaw adjustment screw is positioned for rotation in the wrench head and is axially movable with the lower jaw, but only when a support wedge is slidingly retracted out from its normal position supporting the bottom end of the adjustment screw. The tool can have a ruled edge adjacent to the jaw for indicating jaw opening size. Another feature is a slidable fence device on the fixed jaw, to be moved slidably over a face of the nut when the wrench is in place, providing a stop against sliding of the wrench off the nut. Other optional features include a locking device to prevent the wedge from retracting, when ratcheting is not desired; and a wrench variation wherein the adjustment screw is eliminated and the jaw is simply moved into engagement with a nut via a slide button. Non-adjustable ratcheting wrenches are also disclosed.
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