| 摘要 |
A lock washer, a locking fastener assembly, and a method of providing a secure, inexpensive fastener joint. The lock washer has a convexly conical upper surface including circumferentially spaced cam surfaces separated by radial shoulders and a concavely conical undersurface. The washer is hardened relative to the associated nut so that as the washer and a nut are tightened together the upper face of the washer acts as a die which presses into the underface of the nut to form a mirror mating image of the conical upper surface of the washer on the underface of the nut. The fully torqued nut and washer define coacting ramp surfaces on the underface of the nut and the upper face of the washer which act upon any tendency of the nut to move in a loosening direction to increase the overall height of the nut and the washer so as to further tighten the joint. The washer is hardened to ensure that the surface of the washer cuts as a die into the lower surface of the nut. In the invention methodology the nut and washer are tightened together into a fully torqued position utilizing a common tool to engage the wrenching flats of the nut and washer and press the upper face of the washer into the lower face of the nut, whereafter the washer is held stationary and the nut is backed off a slight amount to remove residual torque in the bolt while increasing the axial loading.
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