Patent ID: 8443699
Filing Date: 2013-05-21
Classification: B25B,B60B

Abstract:
1. A torque control wrench for both a left-hand thread and a right-hand thread, comprising: a wrench unit including a transmission unit, a movable shaft engaged with the transmission unit, for rotating the transmission unit with external force, and a socket for receiving rotational force at a rotation speed changed by the transmission unit and tightening or loosening a bolt with the received rotational force; a handle for generating the rotational force with which the socket tightens or loosens the bolt; and a torque controller between the wrench unit and the handle, for controlling a torque applied from the handle to the socket, including a clutch for rotating along with rotation of the handle and thus rotating the movable shaft and, if a torque equal to or greater than a preset torque value is applied, rotating idly, and a clutch torque controller for controlling the torque applied from the handle to the clutch, wherein, the clutch comprises i) a housing shaped into a cylinder opened at one end of the housing, including an engagement protrusion at the other end of the housing, for rotating the movable shaft and a catching protrusion with a semi-circular section protruding in a radial direction from an inner surface of the housing facing the engagement protrusion, and ii) a clutch shaft including a catching groove formed in correspondence with the catching protrusion, for accommodating the catching protrusion, and a handle engagement portion for engaging with the handle to rotate along with rotation of the handle, and the clutch torque controller comprises i) a first multi-threaded portion formed on the inner circumferential surface of the housing, ii) a torque control plate forming a through hole through which the clutch shaft is extended and having a second multi-threaded portion screwed into the first multi-threaded portion, iii) an elastic member around an outer circumferential surface of the clutch shaft, for providing elastic force to the clutch shaft so that the catching protrusion and the catching groove are brought into close contact, and iv) a control lever at the torque control plate, for controlling a torque applied to the clutch shaft by rotating the torque control plate along the first multi-threaded portion and thus pressing and releasing the elastic member.