Hydraulic and earth engineering – Fluid control – treatment – or containment – Flow control
Patent
1979-03-09
1980-12-30
Corbin, David H.
Hydraulic and earth engineering
Fluid control, treatment, or containment
Flow control
405 97, 405104, E02B 750
Patent
active
042420091
ABSTRACT:
An apparatus for automatically and selectively discharging saline water at a tide-preventing floodgate between the ocean and a river or like which comprises a tide-preventing floodgate provided between the ocean and a river or the like, a drainpipe for discharging saline water distributed in a lower portion of said river or the like and disposed on the utmost lower part of said floodgate, a distal end mouth opened at an end portion of said drainpipe to upright direction, a hollow float positioned at the distal end mouth of the drainpipe and supported by at least one support pole for guiding the ascending or descending motion of the hollow float, a communication path provided at a submarine level portion of said floodgate and a flexible communication pipe for communicating the inside of the hollow float with the sea water of downstream through said communication path, whereby said hollow float automatically ascends or descends so as to open or close said end mouth of the drainpipe with respect to a level difference between upstream water level and downstream water level of the floodgate for discharging saline water of the bottom layer portion of the upstream side or preventing sea water of downstream side of the floodgate from flowing into upstream side of the floodgate.
REFERENCES:
patent: 682480 (1901-09-01), Meyssonnier
patent: 1644445 (1927-10-01), Pratt
patent: 3289417 (1966-12-01), Girden
patent: 3908206 (1975-09-01), Grewing
patent: 4091624 (1978-05-01), Steinke
Corbin David H.
Okamoto Michio
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