Torque wrench

A torque wrench comprising:

• a casing;
• a center shaft, a portion of the center shaft disposed within the casing;
• a guide coupled to the center shaft such that movement of the center shaft causes movement of the guide;
• a retainer disposed at least partly around the guide, the retainer comprising at least one roller;
• a ring engaging with the at least one roller and rotatable relative to the retainer;
• and
• a knob coupled to the ring such that movement of the knob causes movement of the ring, the knob operable between a first knob position and a second knob position, the knob contacting the casing in the first knob position and separated from the casing in the second knob position, the knob being rotatable to adjust a torque setting value of the torque wrench by varying a compression of the at least one roller against the guide by the ring;
• wherein the ring compresses the at least one roller against the guide to resist movement of the ring relative to the guide in the first knob position.

A method for operating a torque wrench having at least one roller, a ring, and a knob coupled to the ring, the method comprising:

• compressing, by the knob, the ring to the at least one roller such that movement of the ring is restricted;
• after compressing the ring to the at least one roller, separating, by the knob, the ring from the at least one roller such that the knob is rotatable to adjust a torque setting value associated with the torque wrench;
• and
• after adjusting the torque setting value, locking, by the knob, the torque wrench at the torque setting value by compressing the ring to the at least one roller.