Patent ID: 7559280

Claim:
An adjustable link assembly comprising: an elongate frame member having a first connection structure at an upper end thereof and a central opening that passes between opposite sides of the elongate frame member; a threaded drive shaft defining opposite first and second ends, the threaded drive shaft positioned in the central opening of the elongate frame member and rotatably connected to the elongate frame member at both the first and second ends; a motor operably connected to the threaded drive shaft to enable rotation of the threaded drive shaft; a slide block operatively engaged to in a sliding relationship with the elongate frame member and operatively engaged in a driving relationship with the threaded drive shaft, wherein rotation of the threaded drive shaft drives sliding movement of the slide block with respect to the elongate frame member; and a clevis-shaped lower frame member pivotally connected to the slide block at opposite sides of the elongate frame member through the central opening, wherein the lower frame member has a base portion and two leg portions extending from the base portion, wherein the lower frame member has a second connection structure at a lower end thereof, and wherein the lower frame member is configured such that at least a portion of the lower frame member surrounds at least a portion of the elongate frame member while still permitting pivotal movement between the elongate frame member and the lower frame member.