Patent ID: 8579242

Claim:
An elevating mechanism for a projection apparatus, comprising: a bottom cover having a through hole; a resetting element disposed on a first side of the bottom cover, wherein at least one first elastic member is formed on one end of the resetting element; a sliding mount disposed on the first side of the bottom cover and leaning against the resetting element, and the sliding mount having an opening, at least one slot and a thread structure; a screw stud sleeve inserted into the through hole and the opening, and slidably coupled to the bottom cover, and the screw stud sleeve having a plurality of engaging teeth engaging with the slot; a screw stud accommodated in the screw stud sleeve and having a thread structure, wherein the thread structure of the screw stud meshes with the thread structure of the sliding mount; and a second elastic member, one end of the second elastic member being connected with the screw stud sleeve, and another end of the second elastic member being connected with the bottom cover, wherein, when the sliding mount is forced to compress the first elastic member, the engaging teeth come off the slot and the thread structure of the screw stud comes off the thread structure of the sliding mount to enable the screw stud and the screw stud sleeve to move in a first direction; and an elastic sheet disposed on the first side of the bottom cover and capable of rubbing against the screw stud sleeve to adjust the speed of the screw stud and the screw stud sleeve moving in the first direction.