Dynamometric screw or nut

Details Dynamometric screw or nut Dynamometric screw or nut

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 31/02 (2006.01)

Patent

CA 2138269

A torque-nut or torque-screw, i.e., a fastening device with fastening threads, i.e., threads which are operative for the fastening function of the device, and with an indication means which is integrated in the device to be released at a predetermined tightening torque, is provided herein. The fastening device includes an inner fastening member having fastening threads which are formed on the inside of the inner fastening member. An outer female member is rotatable by means of a tool, the female member being connected to the inner fastening member by means of a coupling having a strength which is sufficient to transfer, to the inner fastening member, a predetermined torque which is of a magnitude for which the fastening device is designed. The outer female member is designed to be released and rotated relative to the inner fastening member upon tightening of the coupling to a degree that exceeds the predetermined torque. The coupling between the outer female member and the inner fastening member comprises a conical screw coupling.

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