| 主权项 |
1. A lifting mechanism for desk, comprising:
a first bracket; a second bracket; at least one cross-arm assembly comprising at least three connecting ends respectively connected to the first bracket and the second bracket, the cross-arm assembly rotating about a first axis and changing a shear angle thereof so as to drive the first bracket and the second bracket to move to be closer or away from each other relatively along a second axis; a first rail assembly comprising a first rail and a first sliding component, wherein the first rail is disposed on the first bracket and the first sliding component is slidably coupled to the first rail; a second rail assembly comprising a second rail and a second sliding component, wherein the second rail is disposed on the second bracket and the second sliding component is slidably coupled to the second rail; and a positioning component comprising a pivoting end, a forcing end and a plurality of positioning slots between the pivoting end and the forcing end, the pivoting end pivoted to the first bracket or the second bracket such that the positioning slots are located adjacent to a sliding path of the first sliding component or a sliding path of the second sliding component; and a stirring component comprising a protruding rod movably extended to the forcing end, the stirring component pivoted to the first bracket or the second bracket; wherein the first sliding component or the second sliding component further comprises an engaging flange to be engaged in one of the positioning slots, the stirring component adapted to be driven b an external force so that the protruding rod gushes the forcing end such that the positioning component rotates with respect to the first bracket or the second bracket and enables the engaging flange to he engaged in one of he positioning slots. |
