Patent ID: 8227745

Claim:
A height adjustment apparatus for a projector, the projector comprising a sidewall and a bottom wall, the sidewall defining a first opening, and the bottom wall comprising a recessed portion extending towards the inner side of the projector, the height adjustment apparatus comprising: a lifting assembly received in the recessed portion, the lifting assembly comprising: a housing secured to the recessed portion; a supporting member comprising a first end pivotably connected to the housing, and a second end capable of being rotated out of the recessed portion; a first engaging member with a bottom end thereof connected to the supporting member, the first engaging member being slidable in the housing along a direction substantially perpendicular to the bottom wall of the projector, and comprising a first toothed engaging surface substantially perpendicular to the bottom wall of the projector; and a second engaging member comprising a second toothed engaging surface facing and engagable with the first toothed engaging surface of the first engaging member, the second engaging member being slidable in the housing along a direction substantially perpendicular to the second toothed engaging surface, and comprising a pressing surface facing away from the second toothed engaging surface; a pushing rod comprising a connecting end and a pressing end opposite to the connecting end, the pressing end comprising a sloped surface facing and contacting with the pressing surface of the second engaging member, the distance between the sloped surface and the first toothed engaging surface of the first engaging member increasing from the pressing end towards the connecting end; and an operation member exposed out from the first opening for moving the pushing rod towards and away from the recessed portion.