Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1990-11-26
1992-07-21
Noland, Tom
Measuring and testing
Sampler, sample handling, etc.
Capture device
7386385, 137318, G01N 114
Patent
active
051312832
ABSTRACT:
A tool for piercing an electric distribution transformer tank for obtaining a sample of oil therefrom to be tested for PCB contamination is disclosed. The tool includes a threaded body with a wrenchable fitting on one end and a tank punch pin on the other and is adapted for threadable insertion into a threaded hollow shaft of a ground lug nut attached to the tank. The pin is advanced in the lug nut shaft to pierce the tank by wrenchably rotating the fitting. Hollow shafts formed through the pin, punch body and fitting provide a path for the flow of oil from a space in the lug nut shaft between the hole in the tank and the end of the punch body to a syringe which contains a threaded tip inserted into a threaded shaft in the fitting when suction is drawn by the syringe on the shafts after the hole is punched and the pin is backed slightly out of the hole. A threaded nut seals the threaded shaft in the fitting after the filled syringe is removed from the tool to prevent oil leakage. A first nut having a compressible, resilient O-ring partially disposed in a tapered annulus thereof is threadably advanced on the threaded body against the lug nut to prevent oil leakage from the lug nut shaft around the threaded body of the tool. A washer and second nut on the punch body combine with the first nut to form a transformer ground wire attachment assembly to ground the transformer tank through the tool and lug nut.
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Miller Jr. Maurice L.
Noland Tom
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