Mini torque wrench

A mini torque wrench, comprising a tubular body, the tubular body having a first end and a second end opposite to the first end, a rod body being pivotally connected to the first end, one end of the rod body extending out of the tubular body and having a head, another end of the rod body being inserted into the first end and having a force-receiving portion, a trip mechanism being provided in the tubular body adjacent to the force-receiving portion, an elastic member being provided on another end of the trip mechanism opposite to the force-receiving portion, the elastic member being configured to exert an elastic force to push the trip mechanism against the force-receiving portion, the second end of the tubular body having an adjustment unit for adjusting the elastic force of the elastic member, an operating member being rotatably disposed on a periphery of the adjustment unit for operating the operating unit;

• characterized in that:
• the adjustment unit includes a sliding member, a rotating member, a sliding pin and a driving member;
• wherein
• the sliding member is disposed in the tubular body and is movable in an axial direction of the tubular body, the sliding member has an accommodating portion, the accommodating portion axially covers the elastic member so that the elastic member is not in contact with an inner periphery of the tubular body, the sliding member further has a coupling portion extending axially from one side of the accommodating portion, a periphery of the coupling portion has an external thread, a fine adjustment passageway is disposed between the accommodating portion and the coupling portion in the axial direction of the tubular body;
• the rotating member is rotatably disposed at the second end of the tubular body and connected to the operating member, the rotating member has a through hole corresponding to the coupling portion, an inner wall of the through hole has an internal thread for engagement with the external thread, when the rotating member is driven by the operating member, the rotating member screws the sliding member to move in the axial direction of the tubular body and push the elastic member to adjust the elastic force of the elastic member;
• the sliding pin is movable in the fine adjustment passageway, the sliding pin has a front end facing the elastic member and a rear end opposite to the front end, the front end partially extends into the accommodating portion via the fine adjustment passageway;
• the driving member is movable in the fine adjustment passageway, one side of the driving member is against the rear end of the sliding pin, another side of the driving member has an operating portion, the operating portion is driven by an external force to drive the driving member to push the sliding pin, so that the sliding pin moves axially in the fine adjustment passageway and pushes the elastic member for fine-tuning the elastic force of the elastic member.