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1. A watercraft lift for lifting and lowering a watercraft having sides and a bottom, with a bow and a stern, the watercraft lift being positionable in a body of water, comprising:
a freestanding frame having a front end and a rear end; at least one watercraft support movably connected to the frame and movable between a lowered support position and a raised support position, the watercraft support being arranged to engage and lift the watercraft when positioned thereon between the lowered support position and the raised support position; port and starboard pivot arms, each having a lower end portion pivotally movably attached to the frame and an upper end portion, the port and starboard pivot arms being pivotally movable between a forward position wherein the upper end portions of the port and starboard pivot arms are positioned toward the bow of the watercraft when supported by the watercraft support in the raised support position and a rearward position wherein the upper end portions of the port and starboard pivot arms are positioned toward the stern of the watercraft when supported by the watercraft support in the raised support position; at least one actuation member operatively connected to the port and starboard pivot arms to selectively and in unison pivotally move the port and starboard pivot arms between the forward and rearward positions; a roller having a port end portion rotatably supported by the upper end portion of the port pivot arm and a starboard end portion rotatably supported by the upper end portion of the starboard pivot arm for travel with the upper end portions of the port and starboard pivot arms as they are pivotally moved between the forward and rearward positions; a roller actuation member operatively connected to the roller to apply a rotational force thereto as the upper end portions of the port and starboard pivot arms are pivotally moved from the rearward position to the forward position; a forwardly extending securing member having a rearward end portion attached to the frame at a location lower than the bow of the watercraft and a forward end potion positioned lower and below the bow of the watercraft when the watercraft is positioned on the watercraft support with the watercraft support in the lowered support position; a watercraft cover sized to lengthwise extend over the watercraft, the cover having a forward end portion and a rearward end portion, and port and starboard side cover portions, the port side cover portion being sized to cover substantially the full port side of the watercraft and the starboard side cover portion being sized to cover substantially the full starboard side of the watercraft when the port and starboard pivot arms are moved to the rearward position and the watercraft is supported by the watercraft support in the raised support, the cover having a port side pocket extending along an edge portion of the port side cover portion and a starboard side pocket extending along an edge portion of the starboard side cover portion; an elongated and elastic perimeter member extending about a portion of the perimeter of the cover from a position toward the forward end portion of the cover to a position toward the rearward end portion of the cover, the perimeter member having a port side portion extending through the port side pocket of the cover and terminating in an end portion and a starboard side portion extending through the starboard side pocket of the cover and terminating is an end portion, the end portions of the port and starboard side member portions of the perimeter member being attached to the roller, the length of the port and starboard side portions of the perimeter member being sized such that as the cover is unwound from the roller as the upper end portions of the port and starboard pivot arms are pivotally moved from the forward position to the rearward position and the port and starboard pivot arms approach the rearward position, the port and starboard side portions of the perimeter member are stretched into a taut state such that the taut port and starboard side portions of the perimeter member apply downward force along the length of the port and starboard edge portions of the port and starboard side portions of the cover to pull the cover downward over the watercraft as the upper end portions of the port and starboard pivot arms are pivotally moved into the rearward position when the watercraft is supported by the watercraft support in the raised support position; a flexible first attachment member having a first portion attached to the forward end portion of the cover and a second portion attached to the securing member, the flexible first attachment member comprising a flexible port attachment member having a first portion attached to a port side of the forward end portion of the cover and a second portion attached to the securing member, and a flexible starboard attachment member having a first portion attached to a starboard side of the forward end portion of the cover and a second portion attached to the securing member; an elastic second attachment member having a first portion attached to the rearward end portion of the cover and a second portion attached to the roller, the length of the elastic second attachment member being sized such that as the port and starboard pivot arms approach the rearward position, the elastic second attachment member is stretched sufficiently to apply a rearward force on the rearward end portion of the cover sufficient to place the cover in a taut state; and wherein the cover is wound about the roller when the upper end portions of the port and starboard pivot arms are in the forward position with the flexible first attachment member attached to the forward end portion of the cover and to the securing member, and progressively unwinds from the roller and is placed in position extending lengthwise covering the watercraft as the upper end portions of the port and starboard pivot arms are pivotally moved from the forward position to the rearward position when the watercraft is supported by the watercraft support in the raised support position, and wherein the cover is progressively wound about the roller and removed from covering the watercraft by the rotational force applied to the roller by the roller actuation member as the upper end portions of the port and starboard pivot arms are pivotally moved from the rearward position to the forward position when the watercraft is supported by the watercraft support in the raised support position. |
