Tapered screw joint and device for emergency recovery of boring

Details Tapered screw joint and device for emergency recovery of boring Tapered screw joint and device for emergency recovery of boring

1976-05-03

1981-12-08

Callaghan, Thomas F.

Pipe joints or couplings

Particular interface

Tapered

175302, F16L 1500

Patent

active

043044280

ABSTRACT:
A tapered screw joint with the thread profile whose bearing side is inclined at an angle of from about 86.degree. to about 98.degree. to the plane which is perpendicular to the thread axis.
Such a tapered screw joint of parts makes it possible to disconnect them rapidly and repeatedly under the effect of axial tensile loads with subsequent reconnection under the effect of an applied torque. This screw joint will be used most effectively in a device for the emergency recovery of the boring tool from a borehole.

REFERENCES:
patent: 1562373 (1925-11-01), Sheldon
patent: 1895227 (1933-01-01), McCullough
patent: 1953095 (1934-04-01), Baker
patent: 2025944 (1935-12-01), Fisher
patent: 3251426 (1966-05-01), Lebourg
patent: 3729058 (1973-04-01), Roberts
patent: 3942824 (1976-03-01), Sable

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