From this side protrudes a pin, which acts as a trigger for another pin, the latter pin is spring loaded, and fires out of the end of the indicating beam once the trigger pin contacts the adjustable wedge. Directly facing this wedge is the side of the angled indicating beam. This wedge is used to set the desired torque. Attached to the deflecting beam is a scale and onto that is fitted a wedge which can be slid along the length of the scale parallel to the flexing beam.
The deflecting beam torque wrench differs from the ordinary beam torque wrench in how it utilizes this relative displacement. Because of this, there is relative displacement between the two beams. The indicating beam retains its orientation and shape during operation. The other beam (indicating beam) runs directly above the deflecting beam for about half of the length then bends away to the side at an angle from the deflecting beam. The load carrying beam is straight and runs from head to handle, it deflects when torque is applied. There are two beams both connected to the head end but only one through which torque is applied. The wrench functions in the same general way as an ordinary beam torque wrench. Simplified diagram of a deflecting beam torque wrench The operator can both hear the signal click and see a visible indicator when the desired torque is reached. This is claimed to help prolong the accuracy of the wrench throughout its working life, with a greater safety margin on maximum loading and provides more consistent and accurate readings throughout the range of each wrench. It employs the principle of applying torque to a deflecting beam rather than a coil spring. The dual-signal deflecting beam torque wrench was patented by the Australian Warren and Brown company in 1948. Ī more sophisticated variation of the beam type torque wrench has a dial gauge indicator on its body that can be configured to give a visual indication, or electrical indication, or both when a preset torque is reached. Sturtevant patented the torque wrench in 1938 and became the first individual to sell torque wrenches. Paul Allen Sturtevant-a sales representative for the Cedar Rapids Engineering Company at that time-was licensed by Chrysler to manufacture his invention. The beam type torque wrench was developed in between late 1920s and early 1930s by Walter Percy Chrysler for the Chrysler Corporation and a company known as Micromatic Hone. This type of wrench is simple, inherently accurate, and inexpensive. Thus, the end of the indicating beam points to the magnitude of the torque that is currently being applied. When the wrench is used to apply torque, the lever bends and the indicating beam stays straight.
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The indicator beam's free end is free to travel over a calibrated scale attached to the lever or handle, marked in units of torque.
Both of these beams run parallel to each other when the tool is at rest, with the indicator beam usually on top. The second beam is only attached at one end to the wrench head and free on its other, this serves as the indicator beam. When force is applied to the handle it will deflect predictably and proportionally with said force in accordance with Hooke's law. The first is a lever used to apply the torque to the fastener being tightened and serves also as the handle of the tool. The most basic form of torque wrench consists of two beams. This one is displaying an applied torque of about 160 in.lbf or 18 N Detailed view of the torque display scale on a beam type torque wrench.
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