Formation of threads with varying pitch

Details Formation of threads with varying pitch Formation of threads with varying pitch

1992-06-25

1994-05-31

Larson, Lowell A.

Threaded, headed fastener, or washer making: process and apparat

Process

Making internally threaded fastener, e.g., nut

470 96, 470198, B21K 164

Patent

active

053165209

ABSTRACT:
A process and apparatus for forming threads of varying pitch on a work piece, by first producing a partial thread and groove whose pitch does not vary in accordance with a pattern of pitch variation desired for the final product, and then reshaping the partial thread and groove to a final form whose pitch does vary in accordance with the desired pattern. The two steps may be performed by a single tool having a series of thread cutting projections which form the partial thread, and having one or two additional projections which then reshape the partial thread to its final form.

REFERENCES:
patent: 1542893 (1925-06-01), Kreutzberger
patent: 1912517 (1933-06-01), Lapotterie
patent: 1982737 (1934-12-01), Judge
patent: 2307680 (1943-01-01), Hohwart
patent: 2737670 (1956-03-01), Conner
patent: 3125772 (1964-03-01), Beck
patent: 3355752 (1967-12-01), Haralampiev et al.
patent: 4181457 (1980-01-01), Holmes
patent: 4842464 (1989-06-01), Green
patent: 4956888 (1990-09-01), Green
patent: 5086532 (1992-02-01), Green
patent: 5112168 (1992-05-01), Glimpel
The Book "Practical Machine Shop" by John E. Neely pp. 83 to 90 and 415 to 417.
"Machine Tools Processes and Applications" by Heineman and Genevro, pp. 42 to 46 and 210 to 212.
"Machine Shop Operation and Setups" by Lascoe, Nelson & Porter, pp. 64 through 69, shows and describes conventional.

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