Rolling seal sluice gate

Claim 2

A closure member for a sluice gate opening having a predetermined height and width dimensions comprising: (a) a flexible, liquid impervious sheet having height and width dimensions greater than those of the sluice opening; (b) attaching means to attach an upper edge of the flexible sheet to the sluice structure such that the flexible sheet is disposed over an upstream side of the sluice opening; (c) a plurality of pairs of generally horizontal members attached to the flexible sheet, a first one of the pair being attached to an upstream side and a second one of the pair being attached to a downstream side adjacent the first, such that the pairs are vertically spaced apart from each other, at least some of the reinforcing members on the upstream side of the flexible sheet having a length greater than the width of the sluice opening, and the reinforcing members on the downstream side having a length less than the width of the sluice opening to enable them to move into the opening; and, (d) control means connected to a lower edge of the flexible sheet for moving the lower edge upwardly or downwardly to open or close the sluice opening.

Claim 3

A sluice gate closure member as claimed in claim 1 in which at least some downstream reinforcing members have at least one end thereof able to pass into the sluice opening in close proximity to an adjacent wall of that opening.

Claim 4

A sluice gate closure member as claimed in claim 2 in which all the reinforcing members on the upstream side have lengths exceeding the width of the sluice opening and all the reinforcing members on the downstream side have their ends able to pass into the sluice opening in close proximity to an adjacent wall of the opening.

Claim 5

A sluice gate closure member as claimed in claim 1 in which the flexible sheet is made from fabric reinforced resilient polymeric material.

Claim 6

A sluice gate closure member as claimed in claim 4 in which the polymeric material is neoprene.

Claim 7

A sluice gate closure member as claimed in claim 1 wherein the attaching means comprises: (a) a rigid cross-member located adjacent to an upper wall of the sluice gate opening having the upper edge of the flexible sheet attached thereto); and, (b) means to adjustably attach the rigid cross-member to the sluice structure.

Claim 8

A sluice gate closure member as claimed in claim 6 in which the cross-member is shaped and located in use to bias the flexible sheet towards the sluice opening.

Claim 9

A sluice gate closure member as claimed in claim 6 in which the rigid cross-member and its attachment means are removably attached to the sluice structure such that they are removable with the closure member from the sluice structure for service or repair of the latter.

Claim 10

A sluice gate closure member as claimed in claim 6 further comprising a second cross-member secured to the lower end of the flexible sheet, the second cross-member inclined downwardly away from the sluice opening when the gate is closed and means connecting the cross-member to the control means for the gate.

Claim 11

A sluice gate closure member as claimed in claim 6 in which the control means comprises a winch and cable.

Claim 12

A sluice gate closure member as claimed in claim 10 in which the winch is located so that the cable extends at an angle of approximately forty-five degrees from the lower end of the flexible sheet when the gate is closed.

Claim 13

A sluice gate closure member as claimed in claim 10 further comprising a rigid arm projecting from the second cross-member secured to the lower end of the flexible sheet away from the sheet such that the winch cable attached to the free end thereof and the winch are located so that the cable extends substantially vertically.

Claim 14

A sluice gate closure member as claimed in claim 12 wherein the means to adjustably attach the rigid cross-member further comprises mounting means to which the winch is mounted.

Claim 15

A sluice gate closure member as claimed in claim 9 wherein the sluice opening has an upstream side and a downstream side and further comprising: (a) a second flexible, liquid impervious sheet having height and width dimensions greater than those of the sluice opening; (b) a second plurality of pairs of generally horizontal reinforcing members attached to the second flexible sheet, a first one of the pair attached to a downstream side and a second one of the pair attached to an upstream side adjacent the first such that the pairs are vertically spaced apart from each other, at least some of the reinforcing members on the downstream side having a length greater than the width of the sluice opening, and the reinforcing members on the upstream side having a length less than the width of the sluice opening to enable them to move into the opening; (c) attaching means to attach the second flexible sheet to a downstream side of the sluice opening comprising a third rigid cross-member located adjacent to an upper wall of the sluice opening having an upper edge of the second flexible sheet attached thereto and means to attach the third rigid cross-member to the sluice structure; (d) a fourth cross-member attached to a lower edge of the second flexible sheet, the fourth cross-member inclined downwardly away from the sluice opening; and, (e) means connecting the fourth cross-member to the control means.

Claim 16

A sluice gate closure member as claimed in claim 14 wherein the second flexible sheet is made from fabric reinforced resilient polymeric material.

Claim 17

A sluice gate closure member as claimed in claim 15 wherein the polymeric material is neoprene.

Claim 18

A sluice gate closure member as claimed in claim 14 in which the control means comprises a winch and cable.