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Primary Examiner: Callaghan, Thomas F.
Assistant Examiner:
Attorney: Harness, Dickey & Pierce

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Title: Port thread

Abstract: A method and construction for the formation of an internal thread for fluid or other ports which may receive NPT, BSP tapered, or BSP parallel external threads. The port configuration varies with different nominal tube bore diameters, but comprises one or more of the following: Adjustment of tooth form. Adjustment of pitch. A tapered entry and parallel inner portion. The invention applied at least to nominal diameters between 1/8 and 11/2inches.

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Inventors: Miller, Jr., Raymond A. (Madison Heights, MI, US)
Thornton, Douglas M. (Rochester, MI, US)

Application Number: 587121
Filing Date: 1975-06-16
Publication_date: 1977-07-05
Assignee: Ross Operating Valve Company (Detroit, MI)
Primary Class(es): 285/333 285/390, 411/412
Other Classes:
US Patent Ref:

597000	Jan, 1898	Higbee	285/333.
720578	Feb, 1903	Greenfield	285/175.
1973848	Sep, 1934	Duffy	285/333.
2056112	Sep, 1936	Protin	285/333.
3079181	Feb, 1963	Van Der Wissel	285/333.
3158390	Nov, 1964	Woodling	285/334.
3175850	Mar, 1965	Steczynski	285/333.
3323402	Jun, 1967	Gowe, Jr. et al.	85/46.

Other Refs: 413,027

Jul, 1934	UK

Other References: "Handbook of Fastening and Joining of Metal Parts", Laughner and Hargan, 1956, p. 63.
"Screw-Thread Standards for Federal Services", 1957, Handbook H28 (1957)-Part II, No. 28, pp. 18-19.
"Automatic Thread Grinding Machines", Jones & Lamson, 1946, pp. 12-13.