Adjustable torque wrench having a lock device

Abstract

An adjustable torque wrench includes a driving head having an arm received in a shank, and a follower and a spring received in the shank and guided to move along the shank. The follower may be moved to adjust the spring force against the arm. A handle is threaded onto the shank. A knob is secured to the follower. A lock may lock the follower to the shank and includes a control ferrule engaged on the knob and engaged onto the handle with such as a key or a teeth engagement in order to lock the knob to the handle and to prevent the knob from being rotated relative to the handle.

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