Self-locking screw nut
OwnerUbaldo Schiaffinoinventor
Life of this patent
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Abstract
In a self-locking screw nut comprising a central body having a central screw hole and an outside hexagonal upper portion and a downwardly tapering lower portion, and a ring nut having an inner taper matching that of the lower portion of the central body and adapted to be applied thereto, the improvement comprising a slit extending axially over the entire length of said central body and another slit extending from the top of said hexagonal portion to part of the length of said downwardly tapering lower portion to ensure uniform distribution of the forces of deformation acting on the screw nut in its position of use.
Claims1
In a self-locking screw nut including a central body with a screw threaded hole and an external surface having a prismatic portion for engagement by a tightening tool, and an externally tapering portion extending from said prismatic portion, these two portions being coaxial with the tapering portion decreasing in diameter in a direction away from said prismatic portion, said central body having a first longitudinal slit extending over the entire length thereof, and a second partial longitudinal slit extending over the prismatic portion and over part of the tapering portion, the improvement comprising a frustoconical helical spring having an inside diameter corresponding to the external diameter of the tapering portion of the central body for application between said tapering portion and a surface to be clamped by said screw nut, said frustoconical helical spring being mounted on said tapering portion and extending axially beyond the free end thereof, the threads of said frustoconical helical spring being spaced from one another in the unclamped position of said screw nut and approaching one another as said screw nut is tightened to exert pressure both radially inwardly and axially of said screw nut in the clamped operative positive thereof.
Dependencies are inferred from the claim text.