Patent ID: 7736254

Claim:
A tension tender device comprising: a drive shaft; a first plate coupled to the drive shaft and including a first drive stop in the form of an edge on the first plate; a second plate coupled to the drive shaft and including a second drive stop in the form of an edge on the second plate; a first pulley rotatably coupled to the drive shaft, the first pulley including a first recess having an edge that engages the first drive stop to rotate the drive shaft in a first direction when the first pulley is rotated in the first direction; a second pulley rotatably coupled to the drive shaft, the second pulley including a second recess having an edge that engages the second drive stop to rotate the drive shaft in a second direction opposite the first direction when the second pulley is rotated in the second direction, the recesses on the first and second pulleys facing away from each other; fasteners that couple the first plate to the second plate and pass through openings in the first and second pulleys such that the first and second plates rotatably couple the first and second pulleys to the drive shaft; and a resilient coupler coupled to the first pulley and to the second pulley, the resilient coupler that urges the first pulley to rotate in the second direction and that urges the second pulley to rotate in the first direction; a first cable coupled to the first pulley, the first cable having sufficient tension to rotate the first pulley in the first direction and cause the first stop to engage the first drive stop; and a second cable coupled to the second pulley, the second cable having sufficient tension to rotate the second pulley in the second direction and the second stop to engage the second drive stop.