A clamping mechanism includes a catch, a lever, and a rigid bar. The catch is fixed on an object. The catch includes a base, a projection formed on the base, and a stop plate arranged adjacent to the projection. The lever is fixed on another object. The lever includes a tab and a base. The tab is pivotally connected with the base. One end of the rigid bar is connected with the lever, and the other end of the rigid bar engages the projection of the catch. Manipulation of the tab allows the rigid bar to engage or disengage from the catch.