Pipes and tubular conduits – With closures and plugs – Test plugs
Patent
1981-09-16
1983-05-31
Marcus, Stephen
Pipes and tubular conduits
With closures and plugs
Test plugs
73 491, 73 495, 220236, 220237, 285DIG22, F16L 5510, G01M 302
Patent
active
043856438
ABSTRACT:
In the embodiment shown, the Plug comprises an elongate body which has a throughgoing passage formed therein and an external ramp surface. A plurality of jaws are independently engaged with the body, and constrained thereon, for movement along the ramp surface to cause the jaws to extend and grip the inside surface of a to-be-tested tube. The body is externally threaded and receives an internally-threaded nut which is used to move the jaws along the ramp surface. One end of the body has land surfaces formed thereon to accommodate a quick-disconnect coupling thereat of a tube. The opposite end of the body has an expandable seal, for sealingly engaging the inside surface of the to-be-tested tube. The seal comprises a nosepiece, centrally bored, with a hexagonal socket formed therein, and a hollow shaft, externally threaded, which threadedly engages an internal thread formed in the mating end of the body. A compliant annulus is interposed between the latter end of the body and the nosepiece and, in response to threaded movement of the nosepiece toward the aforesaid end of the body, compresses and increases in outside diameter.
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Marcus Stephen
Murphy Bernard J.
Thronson Mark
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