Patent ID: 7980780

Claim:
A linear adjustment device for a sailboat, the linear device comprising: a hollow lower body with a first fixed end extending from a lower end of the device and defining a first attachment point, and an upper end; a threaded ball screw with a first moveable end extending opposite the lower body and defining a second attachment point, and a second end slidably received within the lower body through the upper end of the lower body, the ball screw and the lower body engaging each other to prevent rotation with respect to each other; a recirculating ball nut including an opening sized to receive the ball screw and including a plurality of balls held within races on an interior wall of the opening to engage the threads of the ball screw, the ball nut positioned about the ball screw between the first moveable end of the ball screw and the upper end of the lower body; a barrel positioned about and rotational fixed to the ball screw, the barrel also positioned about and rotatable with respect to the lower body; a sliding sleeve positioned about the lower body and rotationally fixed to the lower body, the sleeve movable between a first position where the sleeve releasably engages with and impedes free rotation of the barrel about the lower body, and a second position where the sleeve is disengaged from the barrel and the barrel is free to rotate about the lower body; wherein when the sleeve is in the first position, the engagement of the sleeve and the barrel prevents tension applied to the adjuster on the fixed and movable ends from urging the barrel to rotate about the lower body by engagement and cooperation of the balls and the threads, and the engagement of the sleeve and barrel permit force applied to the barrel to rotate the barrel about the lower body, permitting the first and second attachment points to be moved closer or further from each other; wherein when the sleeve is in the second position, tension applied to the adjuster is sufficient to urge the barrel to rotate about the lower body and permits the second attachment point to be pulled away from the first attachment point.