US Patent 9615655 Lifting mechanism for desk

A lifting mechanism for desk including a first bracket, a second bracket, and at least one cross-arm assembly is provided. The cross-arm assembly has at least three connecting ends for connecting the first bracket and the second bracket respectively. The cross-arm assembly rotates about a first axis to change a shear angle thereof, and drives the first and the second brackets to move close to or away from each other relatively in a second axis.