Electricity: circuit makers and breakers – Liquid contact – Plural switches
Patent
1991-02-20
1992-09-01
Recla, Henry J.
Electricity: circuit makers and breakers
Liquid contact
Plural switches
200215, 200 6147, 200220, 33366, H01H 2900
Patent
active
051432080
ABSTRACT:
An apparatus for sensing the horizontal level of a table or other surface and returning that table or other surface back to level. The apparatus includes a housing within which first and second mercury switches are positioned relative to each other in a manner which permits the electrical contacts of each switch to be positioned on opposite ends of the housing. Two spring clips are provided for securing the first and second mercury switches within the housing. A pivot rod is provided to permit each mercury switch and spring clip assembly to pivot about a transverse axis within the housing. An adjusting screw and stablizing spring pair are positioned adjacent to each of the two mercury switch and spring clip assemblies. The adjusting screws may be turned to set the position of the mercury switch about the axis of the pivot rod relative to the horizontal plane in order to set a dead band wherein neither of the two mercury switches is closed. A chemical compound is used to seal the housing and prevent the switches from moving once the dead band is set. Finally, an electrical circuit which detects the activation of either of the two mercury switches is provided.
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Shostek Edward M.
Zelina Francis J.
American Sterilizer Company
Barrett Glenn T.
Recla Henry J.
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