Cutting by use of rotating axially moving tool – Tool or tool with support – With pitch-stabilizing ridge
Patent
1983-07-21
1985-10-15
Briggs, William R.
Cutting by use of rotating axially moving tool
Tool or tool with support
With pitch-stabilizing ridge
10141R, 408222, B23G 506
Patent
active
045471045
ABSTRACT:
A self-locking fastener includes a male member, such as a bolt, having a standard, helical, male thread of constant diameter which is deformed by the special female locking threads of a female member, such as a nut. The female threads are defined by leading and trailing flanks which converge to provide a truncated root that frictionally engages and deforms a portion of the male crest. The trailing flanks of the male and female threads are inclined at the same angle and frictionally engage each other throughout their entire depth. The leading flanks of the male and female threads diverge away from each other to provide a space adjacent the truncated female root for receiving the deformed portion of the male crest therewithin. The deformed portion of the male crest and the full engagement of the trailing flanks produces firm metal-to-metal contact between the members throughout the entire length of the female thread, thereby procluding lateral movement of one member relative to the other. A tapping tool having a male thread which is the mirror image of the female thread to be formed is employed to produce the thread form in the female member.
REFERENCES:
patent: 17655 (1857-06-01), Richards
patent: 250728 (1881-12-01), Harvey
patent: 586419 (1897-07-01), Collet
patent: 2116036 (1938-05-01), Money
patent: 4074950 (1978-02-01), Holmes
patent: 4181457 (1980-01-01), Holmes
patent: 4341497 (1982-07-01), Downey et al.
"E Lok Thread"-World of Self-Locking Screws . . . ", Product Engineering, Apr. 1979, pp. 55-59.
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