Patent ID: 7784657

Claim:
An apparatus comprising: a support frame having at least a horizontal member and a vertical member; a first link arm pivotally coupled to the vertical member; a second link arm pivotally coupled to the horizontal member, the second link arm being a different length than the first link arm; a crossbar support frame pivotally coupled to the first and second link arms to provide a pivotal motion geometry that facilitates the crossbar support frame being pivotally moved between a substantially vertical position and a substantially horizontal position relative to the support frame; a first latch pin disposed on the first link arm substantially in a location where the first link arm is pivotally coupled to the crossbar support frame; a second latch pin disposed at a predetermined location on the first link arm; and a first latch disposed at a location on the second link arm to facilitate coupling of the first latch with the second latch pin when the crossbar support frame is in the substantially vertical position and to facilitate coupling of the first latch with the first latch pin when the crossbar support frame is in the substantially horizontal position, wherein the coupling of the first latch with the second latch pin facilitates locking of the crossbar support frame in the substantially vertical position, and wherein the coupling of the first latch with the first latch pin facilitates locking of the crossbar support frame in the substantially horizontal position.