Patent ID: 8245606

Claim:
An adjustable torque wrench comprising: a tubular lever including a chamber formed therein, and including a first end and a second end, and including a lid attached to said second end of said tubular lever, said tubular lever including a window formed therein, a driving shank including a driving head provided on one end and including an inner end portion engaged into said chamber of said tubular lever and including a middle portion pivotally coupled to said first end of said tubular lever with a pivot pin for allowing said driving shank to be pivoted relative to said tubular lever, a roller carrier slidably engaged in said chamber of said tubular lever and pivotally coupled to said inner end portion of said driving shank with a link, at least one roller rotatably attached to said roller carrier and slidably engaged with said tubular lever for guiding said roller carrier to smoothly slide along said tubular lever, a compression spring engaged with said roller carrier for applying a compression force onto said roller carrier and said driving shank, an adjusting screw threaded with said lid of said tubular lever and rotatable and adjustable relative to said lid and said tubular lever for adjusting said adjusting screw longitudinally relative to said tubular lever, said adjusting screw including a first end for engaging with said compression spring and for adjusting the compression force of said compression spring onto said roller carrier when said adjusting screw is threaded and rotated relative to said lid and said tubular lever, and said adjusting screw including a non-circular segment provided on a second end thereof, a control ferrule including a non-circular hole formed therein for slidably engaging with said non-circular segment of said adjusting screw and for allowing said adjusting screw to be rotated relative to said lid and said tubular lever with said control ferrule and for allowing said adjusting screw to be adjusted longitudinally relative to said control ferrule to adjust the compression force of said compression spring onto said roller carrier, said control ferrule including a gear wheel provided thereon, a handle attached to said second end of said tubular lever and including an internal gear for selectively engaging with said gear wheel of said control ferrule and for selectively anchoring said control ferrule and said adjusting screw to said handle and said tubular lever and for preventing said control ferrule and said adjusting screw from being rotated relative to said handle and said tubular lever, and a barrel attached to said adjusting screw and rotated in concert with said adjusting screw, and including a graduation provided on said barrel and aligned with said window of said tubular lever for allowing said graduation of said barrel to be seen through said window of said tubular lever.