Prevailing torque nut
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United States of America Patent
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-
Apr 9, 1985
Grant Date -
N/A
app pub date -
Dec 6, 1982
filing date -
Dec 6, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus is provided for making a prevailing torque nut from a regular nut. The regular nut is placed between two anvil members, and a gap between the anvil members is first decreased so that they contact the nut on opposite sides. Then, the gap between the anvil members is further decreased by a preset amount, in order to permanently inwardly deform the nut. By making the preset amount a constant quantity, a plurality of nuts having slightly different outside and inside dimensions can be consistently deformed. A feature of this invention is the provision of a deformation apparatus which smoothly, progressively and consistently deforms a nut from one end to another. To accomplish this, the anvil members which cause the deformation have oblique working surfaces which taper toward each other, and which are adapted to bear against the nut over substantially the whole of the length of the nut, with the exception of an integral washer if such is present.
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