Patent ID: 8016728

Claim:
A system for adjusting the height of a crossbar, comprising: a first and a second vertically disposed supports; a first and a second unidirectional cord passing structures, each respectively coupled to the first and second vertical supports; a first and a second multiple and bidirectional cord passing structures, each respectively coupled to the first and second vertical supports; a cord of sufficient length to continuously pass through the first and second unidirectional structures and the first and second bidirectional structures as those structures are mounted on the vertical supports; a mechanism for releasably coupling two ends of the cord to achieve the continuous cord arrangement; and a crossbar analogue that is configured for releasable attachment to the cord at two locations that are substantially horizontally level; wherein the cord is arranged in the passing structures such that upward or downward movement of the cord proximate one of the vertical supports causes a similar upward or downward movement of the cord proximate the other vertical support such that the crossbar analogue moves up or down while maintain a substantially level position.