Patent ID: 7182006

Claim:
A torque-controlling wrench comprising a handle, a socket-driving unit installed on the handle and a torque-controlling device comprising: a rod installed in the handle and connected to the socket-driving unit; a knob installed on the handle; a spring compressed between the rod and the knob so that the knob can be turned to adjust a force exerted on the rod by the spring; and an intermediate mechanism comprising a first roller connected to the rod, a frame connected to the spring, a wheel installed on the frame and engaged with the roller and a second roller installed on the frame and engaged with the wheel, wherein the centers of the first and second rollers are located on a same side of a vertical line passing the center of the wheel, wherein as a torque exerted on a fastener by the wrench reaches a pre-determined value, the rod is moved vertically and horizontally relative to the handle, and a downward force exerted on the wheel by the first roller is encountered by an upward force exerted on the wheel by the second roller without causing the pivoting of the frame.