Brushing – scrubbing – and general cleaning
Patent
1975-04-21
1976-07-27
Larson, Lowell A.
Brushing, scrubbing, and general cleaning
151 21B, B21D 5324
Patent
active
039710858
ABSTRACT:
A lock nut blank and a method of making a lock nut having a portion only of its threads, and not more than three complete threads, compressed axially and not radially so as to engage a mating bolt with sufficient resilient force to provide substantial torque in opposition to turning of the nut, said torque being substantially constant over the entire range of travel of the nut along the bolt and maintaining the minimum breakaway torque as a substantial proportion of the initial tightening torque, throughout repeated operations, said force being so limited that galling of the thread, nut and screw is prevented. The nut is made by first producing a blank having a body, which in one embodiment is of conventional form, and a relatively thin walled collar connected integrally at one of its ends to an end of the body adjacent the inner periphery thereof. The blank is initially threaded with the same pitch in both the body and the collar. The collar wall thickness has a critical relation to the thread depth and the axial length of the collar has a critical relation to the thread pitch. After the blank is formed within these dimensional limitations, the collar is compressed axially, either by a steady force or by an impact, beyond its elastic limit, so that it is permanently shortened within a controlled tolerance range and the pitch on the threads in the collar is reduced.
One embodiment has an upstanding peripheral shoulder on the blank, shorter than the projecting collar and spaced radially therefrom, and serving as a stop for a compressing tool engaging the end of the collar, so as to limit the compression. The outer periphery of the collar is free of restraint throughout the compression, so that the metal of the collar can flow outwardly. A plurality of nut blanks can be compressed at the same time by a single press or hammer.
REFERENCES:
patent: 426185 (1890-04-01), Ibbotson
patent: 1077023 (1913-10-01), Ward
patent: 1367168 (1921-02-01), Stanford
patent: 1522565 (1925-01-01), Whitman
Combs E. M.
Larson Lowell A.
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