| 摘要 |
An adjustable wrench mechanism is provided which has the capability of imparting significant clamping force to the movable jaw of the wrench mechanism. An elongate worm gear rotatably positioned within the handle structure of the wrench is manually rotatable to impart linear motion to an elongate drive rod within a drive rod passage of the wrench handle. To the drive rod is coupled a flexible elongate chain-like drive section capable of transitioning from the drive passage to an angularly oriented keyway and in such manner so as to engage within a drive receptacle of the key structure and impart significant driving force to the drive section of the key structure of the movable jaw. Fixed and movable jaws of the wrench mechanism define flat working surfaces that are slightly out of parallel and become precisely parallel as the tolerances of the movable jaw key and keyway are taken up by application of manual force. The elongate flexible drive section may incorporate a plurality of spherical or washer type drive elements which are threaded onto an elongate flexible drive cable and secured thereto by means of a terminal connector.
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