Threaded – headed fastener – or washer making: process and apparat – Process – Making externally threaded fastener – e.g. – screw or bolt
Patent
1992-09-09
1993-10-05
Larson, Lowell A.
Threaded, headed fastener, or washer making: process and apparat
Process
Making externally threaded fastener, e.g., screw or bolt
470 96, 470 66, 470198, 470 10, 408215, 408138, 409 65, 409 70, B21D 5324
Patent
active
052500071
ABSTRACT:
Apparatus and methods for forming a thread of varying pitch by utilizing a threading assembly which includes a plurality of threading elements having thread cutting or forming portions on the different elements for engaging the work piece at different locations, with the assembly and work piece being driven both rotatively and at the same time axially relative to one another to form the thread. The rate of axial advancement per revolution between the work piece and each of the threading elements is varied, and the elements of the assembly are also shifted axially relative to one another during the rotary and axial movement, to give the thread its varying pitch.
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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 Operations and Setups" by Lascoe, Nelson & Porter, pp. 64 through 69.
Green William P.
Larson Lowell A.
McKeon Michael J.
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