Patent ID: 7332074

Claim:
A circulation system for a body of water, said system including a flotation platform, a dish, an impeller, a drive motor, and a connecting arrangement ( 100 ) between said drive motor ( 17 ) and said impeller ( 21 ), said connecting arrangement including a first shaft ( 17 ′) driven by said drive motor to rotate about a first, substantially vertical axis ( 13 ), a second shaft ( 21 ′) extending along a second axis ( 13 ′) and secured to said impeller, and a coupling between said first and second shafts to substantially align said first and second axes wherein rotation of said first shaft about said substantially vertical first axis by said drive motor rotates said second shaft and the impeller secured thereto about said second axis, said coupling including at least first ( 101 ) and second ( 102 ) coupling members removably attached to one another wherein said second shaft ( 21 ′) and the impeller ( 21 ) secured thereto can be selectively removed from attachment to said first shaft ( 17 ′) wherein one ( 101 ) of said coupling members has at least a pair of legs ( 105 ) extending along said first axis ( 13 ), said legs being spaced from one another to create a gap extending between and through said legs and open on opposite sides of the legs wherein the other ( 102 ) of said coupling members has a substantially rectangular head ( 106 ), said substantially rectangular head being selectively, removably receivable between the legs of said one coupling member from either side of said gap and securable between the legs of said one coupling member.