Importance

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Abstract

This dynamometer wrench (6) includes a head (2) for tightening a member to be screwed, an operating grip (3), a deformable and bending-sensitive handle (7) connecting the grip to the tightening head, and an electronic means (M) for measuring the deformation of the handle and for displaying the tightening torque determined from the deformation measurement. The handle includes a region whose principal cross-section differs from that of the remainder of the handle by virtue of a void (9) and such that it can locally transform shear stresses generated by the operating force (F) into elongation/compression stresses parallel to the surface of the handle. This arrangement makes it possible to compensate for error caused by taking bending alone into consideration when determining the torque transmitted by the tightening head, and hence to avoid exceeding the maximum tightening torque beyond which the profile of the tightening head or the screw thread of the member to be screwed would be damaged, and this by an inexpensive system.

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First Claim