Torque Wrenches and its Types
A torque wrench is made up of a long lever arm between the handle and the head. Moreover it is made up of a material that bends elastically when some torque is applied on it. A smaller bar with an indicator is connected to the back of the head of wrench. It is kept in parallel to the lever arm of the torque wrench. This smaller bar which is connected to the torque wrench does not come under any type of strain and so remains straight. Along with such arrangement there is a calibrated scale which is fitted to the handle. This scale is moved under the indicator when the main lever is bent. The operator or the user stops applying the force once the indicated level of torque is achieved. Such a type of arrangement makes the torque wrench to perform very accurately and steadily. Along with this, it is very simple to use and inexpensive.
The deflecting beam torque wrench is also known as a dual-signal deflecting beam. Such torque wrench works on the principle of applying torque to a deflecting beam and not on a coil spring. With such principle of working the life of the wrench is increased along with a greater safety margin. It gives the ability of maximum loading over the wrench. Such step helps the user to gain efficient, consistent and accurate readings. The operator or the user can get the full control over the use of a torque wrench as he or she can see and hear when the dual-signal reaches the specific level of torque.
A calibrated clutch mechanism is an effective method to preset the torque. In such type of mechanism the clutch slips when a particular level of torque is reached. This level of torque is decided by the operator and thus helps in preventing the additional tightening. The most common type of wrench in this category is a ball detent and a spring. The spring is preloaded by the use of a screw thread which is calibrated in different torque units. In this application the force is transmitted by the ball until the specific torque is reached. As soon as this specific torque is reached, the force is exerted by the spring overcomes and the ball clicks out of the socket. Such design gives higher precision and accurate result. There are large numbers of design variations available in the market depending on its application and the torque ranges. Such designs are also used in some drills to prevent gouging the heads of the screws.
A No-hub wrench is a special kind of a torque wrench as compared to variety of wrenches available today. Such torque wrenches are used for soil pipe couplings by the plumbers to tighten the clamping bands. “No – hub” wrench is a T-handled wrench having a one way combination clutch and ratchet. The shaft of such wrench comes with a folding handle which is used to loosen the clamps.
RK Engineering Enterprises is one of the pioneers in the development of specialized industrial hand tools. RK's range of products include Triptork Torque Wrenches, Triptork Torque Multipliers, Triptork Torque Screw Drivers, Garuda Hydraulic Pullers and various Industrial Hand Tools. Visit www.rktriptork.com for more information.