Self-relieving bar screen

Details Self-relieving bar screen Self-relieving bar screen

1983-02-22

1985-12-31

Lacey, David L.

Liquid purification or separation

Structural installation

Flume stream type

210159, 210162, 210396, B01D 3516

Patent

active

045619751

ABSTRACT:
A self-relieving bar screen, for intercepting debris moved by a liquid through a conduit into a space having a greater lateral dimension, includes a series of bars disposed in spaced lateral relation in a position normally opposite the discharge end of the conduit, with a lower, generally forwardly extending portion of each bar below the lower edge of the conduit and a generally upwardly portion extending up to opposite the upper edge of the conduit. The series of bars extend laterally past each side of the conduit but for a distance less than the width of the wall at which the conduit terminates. The side spaces thus provided permit liquid to flow to each side of the bars, in the event debris accumulates on the bars and may otherwise tend to obstruct the flow of liquid. The bar screen may be moved upwardly periodically with the debris collected thereby and emptied into a receptacle or the like, through a pivotal rake which is specially positioned. The bar screen may be guided during upward and downward movement, imparted by a chain, cable or the like, by a roller or sliding block movable in a channel having a curved upper end to tip the bar screen for discharge. A screen gate may be associated with the bar screen to close the end of the conduit when the bar screen is discharging. This screen gate may have blades covering the end of the conduit, moved into position by a cable and counterweight arrangement. The screen gate is moved downwardly, to uncover the end of the conduit, by the bar screen when it is moved to collecting position. The bar screen which relieves flow when debris accumulates on it may also be fixed and a cleaning rake moved upwardly through it, the cleaning rake having teeth interspaced with the bars of the bar screen. A special deflector for removing debris and a roller-mounted wiper blade for the cleaning rake are also disclosed.

REFERENCES:
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patent: 3190448 (1962-01-01), Johnston et al.
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patent: 3909411 (1975-09-01), Angele et al.
patent: 4184957 (1980-01-01), Botsch
patent: 4214989 (1980-07-01), Rudolph et al.
patent: 4447323 (1984-05-01), Jackson

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