Abstract: A lifting platform includes a base, two “T”-shaped parallel sliding grooves in supporting bars, two wheels, a platform, and a cylinder. Each wheel is held away from the internal far rolling surface of each sliding groove in an original position because of the orientation of the connected platform, but can contact and rest upon the rolling surface and further roll along the rolling surface when the platform is rotated. A hydraulic or air-driven piston rod of the cylinder can push the platform to first rotate and then move upward. The platform is transitionable between: (i) an inclined configuration in which each first wheel is in the original position; (ii) a horizontal configuration in which each first wheel contacts and rests upon a sliding groove; and (iii) a lifting configuration in which each first wheel rolls along a sliding groove.

Abstract: An electronic device includes an electronic card connector. The electronic card connector includes a tray assembly configured to receive an electronic card, and a base configured to receive the tray assembly. The tray assembly includes a hook mechanism, and the base includes a hook engaging mechanism. The tray assembly is locked in the base by an engagement of the hook mechanism and the hook engaging mechanism. The base also includes an elastic member. The elastic member is configured to eject the tray assembly out of the base when the hook mechanism is disengaged from the hook engaging mechanism.