Height adjustment device having a screw axially moveable...

Details Height adjustment device having a screw axially moveable... Height adjustment device having a screw axially moveable...

2008-06-13

2010-12-14

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S239000

Reexamination Certificate

active

07851741

ABSTRACT:
The present invention is related to a height adjustment device adapted in the projection apparatus and projection apparatus comprising the height adjustment device. The projection apparatus has a body and a height adjustment device. The height adjustment device comprises at least one connecting element, a rotary plate, and a screw. The connecting element is connected to the body. The rotary plate meshes with the connecting device for relative rotation, and a threaded hole is formed at the center of the rotary plate. The screw is inserted through the threaded hole to enable the rotary plate to make a linear up-down movement along the axis of the screw when the rotary plate rotates around the screw. Thus, the height adjustment device of the present invention enables a height adjustment without requiring strenuous effort and damaging the projection apparatus.

REFERENCES:
patent: 2429164 (1947-10-01), Mast et al.

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