Pipes and tubular conduits – End protectors – Threaded
Patent
1982-08-05
1984-02-07
Bryant, III, James E.
Pipes and tubular conduits
End protectors
Threaded
138 89, 29 33T, B65D 5906, F16L 2102
Patent
active
044297190
ABSTRACT:
A pipe thread protector is provided which includes two members, one slidably constrained within the other. The interior member has a guide section which includes internal ridges adapted to engage the threads of a pipe section. When placed in one position within the outer member, this upper section is expanded to allow insertion over the end of a pipe. The resistance of the pipe section pushes the interior member further into the second member to assume a second position whereby the guide section is radially contracted. This places the ridges in sealing engagement with the threads of the pipe. Simultaneously, air is forced out from between the interior and exterior members through a valve in the base of the outer member so that a partial vacuum is formed between the inner and outer members. Surrounding air pressure secures the interior member in its second position and the pipe thread protector mounted on the pipe. When it is desired to remove the pipe thread protector, the valve is manually opened, equalizing inside and outside forces on the protector, enabling extraction of the protector from the pipe member without resistance.
Alternatively, mechanical structure may be devised for maintaining the pipe thread protector in engagement with the pipe threads. Further, the pipe thread protector may be adapted to engage and protect internal pipe threads.
REFERENCES:
patent: 2143480 (1939-01-01), Gundermon
patent: 2378710 (1945-06-01), Krause
patent: 3485271 (1969-12-01), Halsey
patent: 3586031 (1971-06-01), Muller et al.
patent: 4020873 (1977-05-01), Palarino
patent: 4205707 (1980-06-01), Lyndgren
patent: 4269232 (1981-05-01), Witschi
Bryant III James E.
Matthews Guy E.
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