Clarifier cover
DCFirst Claim
1. In combination, a clarifier and a clarifier cover mounted over said clarifier for retaining off-gases inside said clarifier;
- said clarifier having an upper opening defined by edges comprising a first and second opposite edges;
said clarifier cover comprising;
a plurality of trusses extending across said opening between said first and second opposite edges;
a flexible sheet laid over said trusses and having a first and second opposite margins;
means for retaining and sealing said first margin to said first edge;
means for pulling and releasably sealing said second margin to said second edge, comprising winch means affixed to said second edge.
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Accused Products
Abstract
In the present invention, there is provided a removable cover for retaining off-gases inside a clarifier. The cover comprises trusses extending across the clarifier and a flexible sheet laid across the trusses. Structural angles enclose the clarifier and constitute a kick plate on the walkways around the clarifier for improving the safety of workers. One side of the flexible sheet is permanently affixed to a first wall of the clarifier. A series of pullers are mounted inside the structural angles for pulling and releasably sealing the three other sides of the flexible sheet against the outmost trusses and against a second wall of the clarifier opposite the first wall. Each puller has a cable-deflector bar extending substantially at a same level as a mounting surface of the puller for increasing an angle of downward pull on the flexible sheet. The flexible sheet is rolled-up along the trusses to expose machinery inside the clarifier.
31 Citations
17 Claims
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1. In combination, a clarifier and a clarifier cover mounted over said clarifier for retaining off-gases inside said clarifier;
- said clarifier having an upper opening defined by edges comprising a first and second opposite edges;
said clarifier cover comprising;a plurality of trusses extending across said opening between said first and second opposite edges;
a flexible sheet laid over said trusses and having a first and second opposite margins;
means for retaining and sealing said first margin to said first edge;
means for pulling and releasably sealing said second margin to said second edge, comprising winch means affixed to said second edge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- said clarifier having an upper opening defined by edges comprising a first and second opposite edges;
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12. In combination, a clarifier and a clarifier cover mounted over said clarifier for retaining off-gases inside said clarifier;
- said clarifier having an upper opening defined by edges comprising a first and second opposite edges;
said clarifier cover comprising;a plurality of trusses extending across said opening between said first and second opposite edges;
a flexible sheet laid over said trusses and having a first and second opposite margins;
means for retaining and sealing said first margin to said first edge;
means for pulling and releasably sealing said second margin to said second edge, comprising a hem along said second margin, a pipe in said hem and a plurality of hooks engaged with said pipe, each of said hooks being movably mounted to a treaded stem anchored to said second edge. - View Dependent Claims (13, 14)
- said clarifier having an upper opening defined by edges comprising a first and second opposite edges;
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15. A clarifier cover for retaining off-gases inside a clarifier having a first and second opposite edges, comprising;
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a plurality of spaced-apart trusses mounted across said first and second opposite edges;
said trusses comprising first and second outmost trusses each having an arched plated structure attached thereto;
a flexible sheet laid over said spaced-apart trusses;
said flexible sheet having first and second longitudinal margins and first and second lateral margins;
means for retaining and sealing said first longitudinal margin to said first edge;
means for pulling and releasably sealing said second longitudinal margin to said second edge; and
means for pulling said flexible sheet across said trusses and for releasably sealing said first and second lateral margins to said first and second outmost trusses respectively;
whereby said first and second edges, said first and second outmost trusses and said flexible sheet are usable for containing off-gases inside a clarifier, and said flexible sheet is selectively movable over said trusses for accessing equipment inside said clarifier. - View Dependent Claims (16, 17)
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Specification