Patent ID: 8814288

Claim:
An apparatus comprising: a shelf; and a support structure for supporting the shelf, the support structure comprising rotation features that cause the shelf to rotationally pivot from a first height position to a second height position in response to an applied force; wherein the rotation features comprise two pairs of wheels, wherein one of the pairs of wheels is attached to one side of the support structure and another one of the pairs of wheels is attached to another side of the support structure, each pair of wheels comprising a front wheel and a rear wheel; wherein the support structure further comprises a pair of slides, wherein one slide of the pair of slides is attached to one of the pairs of wheels and another slide of the pair of slides is attached to the other one of the pairs of wheels, the shelf being supported by the pair of slides; wherein, upon application of the applied force, the shelf rotationally pivots around respective axes of the pair of slides as the pair of slides rotate around respective axes of the two pairs of wheels; and wherein the support structure further comprises a roller, and each of the front wheels of the two pairs of wheels comprises a set of grooves formed on respective curved outermost peripheral edges of the front wheels, and wherein the shelf is locked in either the first height position or the second height position when the roller is engaged in one of the set of grooves of the front wheels.