Patent
1977-06-06
1979-01-09
Combs, E. M.
B21D 5324
Patent
active
041330668
ABSTRACT:
A method for manufacturing a self-locking spring nut is disclosed herein. In this method, a spring nut is tapped in its stretched or compressed condition, where a lead or pitch of the spring nut of a helical form is increased or decreased, say 0.5 to 6%. Accordingly, when a bolt is inserted into the spring nut thus prepared, then threads on the bolt undergo a compressive or tensile stress by the spring nut.
As a result, the spring nut may be locked on a bolt in any position. This method utilizes an elasticity of the spring nut to be locked on the bolt, rather than interference between the female and the male threads on the nut and bolt, respectively, for instance, interference caused by deforming the configuration of threads or changing a pitch of a male thread relative to that of a female thread. Accordingly, the self-locking nut of the invention may be repeatedly used, without being damaged. The pitch of the spring nut of a helical form, however, should differ from the pitch of a tapped or female thread provided in the inner surface of the spring nut.
REFERENCES:
patent: 1913685 (1933-06-01), Schalk
patent: 2306806 (1942-12-01), Hoopes
patent: 3459248 (1969-08-01), Waller
patent: 3461935 (1969-08-01), Monticelli
patent: 3515027 (1970-06-01), Textrom
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