Tapered screw joint and device for emergency recovery of boring tool from borehole with the use of said joint
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United States of America Patent
Stats
-
Dec 8, 1981
Grant Date -
N/A
app pub date -
May 3, 1976
filing date -
May 3, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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