Mercury float switch
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United States of America Patent
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-
Oct 18, 1988
Grant Date -
N/A
app pub date -
Jun 5, 1987
filing date -
Jun 5, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In one embodiment, the mercury float switch includes a sealed, partially mercury filled bent tube having two contact leads extending from one end. A shroud of plastic, injection molded material covers the portion of the tube where the two contact leads extend. The shroud is formed to have two opposing pivot arms extending therefrom. Each pivot arm encapsulates a respective lead. Connecting wires are electrically connected to each contact lead and the insulation surrounding the connecting wires is also encapsulated within a corresponding pivot arm. A foamed plastic, buoyant body completely encapsulates the tube as well as the shroud except for the ends of the pivot arms. This buoyant body is retained in a housing structure which has journals on opposing walls thereof which retain the pivot arms and allow the bouyant body pivot assembly to rotate freely on the pivots. The housing structure limits the rotational movement of the buoyant body. The connecting wires extend from the ends of pivot arms and are accessible from the exterior of the structure.
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