Self-sealing tapered thread form

Details Self-sealing tapered thread form Self-sealing tapered thread form

1981-02-18

1984-01-03

Scanlan, Jr., Richard J.

Pipe joints or couplings

Particular interface

Tapered

285390, 285417, F16L 2500, F16L 1500, F16L 2100

Patent

active

044238932

ABSTRACT:
A tapered tap suitable for producing tapered pipe threads includes a body provided with a helical thread form having a tapered cross-sectional shape. The thread form is defined by a pair of converging flanks which form a thread crest and thread root respectively lying along inner and outer converging axes. In one embodiment, a portion of the thread crest is radially offset from the outer axis and generates a tapped female thread in which a portion of the tapped thread root is of reduced diameter; the thread root of reduced diameter firmly engages and deforms the crest of a standard male tapered thread to assure that at least a portion of the helical tunnel between the male and female threads is completely sealed to prevent fluid leaks therethrough. In another embodiment, a portion of the thread root of the tap is also radially offset from the inner axis to generate a tapped thread crest of reduced diameter which deforms upon engagement with a standard male tapered thread, thereby improving the seal.

REFERENCES:
patent: 1927656 (1933-09-01), Eaton et al.
patent: 1932427 (1933-10-01), Stone
patent: 2183644 (1939-12-01), Frame
patent: 2204754 (1940-06-01), Frame
patent: 3994516 (1976-11-01), Fredd

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