Pipe plug and centering construction for centering ridged key in mating groove in pipe plug
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United States of America Patent
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-
Dec 15, 1987
Issued Date -
N/A
app pub date -
Aug 27, 1986
filing date -
May 10, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pipe plug which cannot be removed from a pipe with the same key with which it is installed, the pipe plug having a body with a plurality of arcuate grooves having inclined arcuate ramps leading from its face into its body and terminating at shoulders for abutting engagement with first key having pins which bear against the shoulders to tighten the plug in the pipe but which cannot loosen the plug because the pins will ride up the ramps and cam out of engagement with the plug, and a second key for removing the plug including a ridge on the second key for mating with a complementary curvilinear groove in the plug. A counterbore is provided in the face of the plug to receive portions of the ridge which are of substantially the same diameter as the counterbore to thereby center the second key with respect to the plug and guide it while the second key is rotated until the ridge thereon falls into the groove to effect mating engagement therewith.
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