L/R-ΔLoc (Delta Lock) Fastening Mechanism
The three vertices of the triangular-prism-shaped Δ (delta) part of the first mounted left-handed “L-nut” plastically deform the cylindrical part of the right-handed “R-nut” that is afterwards mounted.
The L/R-ΔLoc mechanism is set to “deformed isoperimetric” so that the outer peripheral length of the delta part and the inner peripheral length of the cylindrical part are almost equal. This cylindrical part is designed so that its deformation is within the plastic range, and when it is fitted to the delta part, it is configured so that it is pressed in the residual elastic range while accommodating a round object along the triangle. With this, it is possible to maintain a strong rocking state, and as a result, the two nuts are integrated and cannot be pulled out from the L/R bolt.
What is Elasto-Plastic Mechanics
Most objects can be deformed by an external force, but when they do not return to the original shape after being deformed, it is known as plastic deformation (permanent deformation). Contrarily, elastic deformation is a shape change that is self-reversing after the force is removed. "Elasto-plastic mechanics" is a product that combines these different properties.