Nitinol washers
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Issued Date -
Dec 12, 2002
app pub date -
Jun 11, 2002
filing date -
Jun 11, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A lock washer for locking a threaded fastener from loosening under vibration includes an annular body with a central opening cutting from a sheet or plate of Nitinol, and an integral layer of NiTiOx on at least one face of said body. The lock washer is made of a high transition temperature form of Type 55 Nitinol that remains in its martensitic state in all normal conditions of use. The martensitic Nitinol initially yields during torquing of the nut to allow the nut to indent itself slightly into the lock washer. The resulting cold working of the washer material causes a transformation into stress-induced martensite, which is strong and elastic to resist further deformation and also exerts a preload on the bolt shank. The nut, indented into the lock washer, strongly resists turning under vibration, which effect is further enhanced by the vibration absorbing characteristics of the material. The integral layer of NiTiOx on the surface of the washer provides electrical insulation, minimizing galvanic corrosion.
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