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Measuring device for water flow in a buried pipe

  • US 4,026,151 A
  • Filed: 05/10/1976
  • Issued: 05/31/1977
  • Est. Priority Date: 05/10/1976
  • Status: Expired due to Term
First Claim
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1. For insertion through a vertical passageway to measure (a) the depth of sediment on the floor of a generally horizontal sewer pipe accessible through the vertical shaft and below the ground level, and (b) the depth of waterflow above the sediment in the pipe, a device comprising:

  • a shaft with an upper end and a lower end and of an axial length to reach from above the ground level to the pipe floor,an elongate sleeve having a lower end and said sleeve being of an axial length less than the shaft length and having a portion with an upper end, said sleeve being telescoped over said shaft,the lower end of the sleeve including a radially extending surface to rest on the surface of sediment in the pipe,mutually cooperating means included on the upper end zone of the shaft and on the sleeve portion upper end to indicate the axial displacement of the lower end of the sleeve relative to the lower end of the shaft when said radially extending surface rests on the surface of sediment in the pipe,structure slidably captivated on the sleeve for axial movement along the sleeve above the radially extending surface,said structure including;

    (a) a boom extending radially outwardly of said sleeve above the lower end of said sleeve,(b) float means to float on water in the pipe, said float means having a forward zone and a rearward zone,(c) means suspending the float means from the boom, said means suspending including a strand length under tension and supporting said float means when the weight of the float means is acted upon by gravity alone and said tension is reduced when the float means are supported by buoyancy forces exerted by water, and(d) tether means connecting the forward zone of the float means to said structure;

    means to raise and lower said structure; and

    means to sense tension changes in said means suspending including a signal means to signal when tension is reduced in said means suspending and including first circuit means comprising an energy source and said means to sense and said signal means.

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