Patent ID: 8573551

Claim:
A fine-adjusting apparatus for an overhead projector having a top, and the fine-adjusting apparatus comprising a mounting frame being adapted to securely mount on a wall; an assembling device detachably connected to the mounting frame and having a sliding mount slidably mounted in the mounting frame and having two sidewalls; a front end; a rear end; a top; and a bottom; and a base mount pivotally connected to the sliding mount below the mounting frame and having a top abutting the bottom of the sliding mount; a bottom; and two sidewalls; a pitch-adjusting device connected to the assembling device and having a pitching frame securely connected to the base mount and having a top securely connected to the bottom of the base mount; two free sides formed on and protruding downwardly from the top of the pitching frame and being parallel to each other; and two guiding slots respectively and obliquely formed through the free sides of the pitching frame and aligning with each other; a guiding bar slidably connected to the pitching frame between the free sides of the pitching frame and having two inserting ends respectively mounted in the guiding slots of the pitching frame to enable the guiding bar to move relative to the pitching frame along the guiding slots; and a pitch-adjusting shaft rotatably connected to the guiding bar; a left-right adjusting device connected to the pitch-adjusting device and having an adjusting frame connected to the pitch-adjusting shaft of the pitch-adjusting device and the base mount of the assembling device; a left-right adjusting shaft rotatably connected to the adjusting frame and parallel the pitch-adjusting shaft; and a linking element movably connected to the left-right adjusting shaft; and a connecting mount pivotally connected to the left-right adjusting device, being adapted to connect with the overhead projector and having a connecting board connected to the adjusting frame and the linking element of the left-right adjusting device; and two pivot frames mounted on the connecting board and respectively and pivotally connected to the adjusting frame.