Patent ID: 8607675
Filing Date: 2013-12-17
Classification: B25B

Abstract:
1. A torque wrench comprising: a hollow handle having a space defined therein; a driving head having a shank extending therefrom which is inserted into the space, the shank pivotably connected to the handle by a pin and the shank being pivotable within the space; a compression unit located in the space and having a resilient member and end piece, the resilient member having a first end contacting the end piece and the end piece contacting a distal end of the shank; an adjustment unit connected to the handle to adjust the resilient member to reach a torque value of the driving head; the adjustment unit has an outer tube and an adjustment rod which is movably located in the handle, the outer tube is rotatably mounted to the handle and has a threaded hole, the adjustment rod has a threaded section which is engaged with the threaded hole, when the outer tube is rotated relative to the handle, the adjustment rod moves axially to change a length of the resilient member and move the second piece; an index unit having a second piece, a first index and a second index, the second piece, the first index and the second index being an integral part and movable longitudinally with a length change of the resilient member; a display unit fixed to the handle and having a display member, a calculation member and at least one movement sensor which detects a movement distance of the first index and generates a signal which is calculated by the calculation member and transferred into a torque value displayed in the display member, and a scale member being a transparent member and having marks thereon, the scale member located to the handle and corresponding to the second index, the mark being pointed by the second index being the torque value.