Patent ID: 7244078

Claim:
A control gate adapted to be installed across a channel for liquids, the control gate comprising: a barrier member with a sidemember that has a circular arcuate section, the barrier member being pivotally mounted at or adjacent to the base of the channel; and a drive cooperating with the side member for raising and lowering the barrier member to regulate flow of liquid through the control gate, the drive including a cable and a winding spool, the cable being looped at least once around the winding spool and on each side of the winding spool the cable is respectively secured to opposite ends of the circular arcuate section under tension with the winding spool being adjacent to the circular arcuate section in order to maintain the cable in a substantially peripheral contact with the circular arcuate section when the winding spool cooperates with the cable along the circular arcuate section for transferring rotary motion of the winding spool into motion of the side member.