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Liquid level alarm system

  • US 5,945,913 A
  • Filed: 05/19/1997
  • Issued: 08/31/1999
  • Est. Priority Date: 12/26/1995
  • Status: Expired due to Fees
First Claim
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1. An alarm system for use in a container having a top having inner and outer surfaces, a bottom having inner and outer surfaces, and at least one wall having an inner and outer surface, which container contains a liquid having a surface level which fluctuates between a predetermined high point and a predetermined low point;

  • said system comprising;

    (a) an alarm means to be positioned outside the container;

    (b) A pair of tracks having an upper end and a lower end to be positioned vertically within the container and extending at least between a point near the predetermined high point of the liquid and a point near the predetermined low point of the liquid;

    (c) an electrical switching means to be positioned inside the container near the predetermined low point of the liquid surface, said switching means having a top, a bottom, and at least one side, the top or the side of said switching means having a switch, which switch is capable of being pushed vertically downwardly to actuate an activating mechanism contained within the switching means which, in turn, activates the alarm;

    (d) a connecting means for electrically connecting the switching means and the alarm means; and

    (e) a float suitable for floating on the surface of the liquid, said float having rollers attached thereto, which rollers fit in the tracks allowing the float to move vertically as the liquid rises and falls yet maintain its position relative to the switching means, said float being capable of depressing the switch when the level of the liquid falls to a point which is sufficiently low that the weight of the float presses down upon the switch, the spatial correspondence between the float and the switch being such that the float comes in direct contact with the switch when the surface level of the liquid falls to the predetermined low point.

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