Optics: image projectors – Housing
Reexamination Certificate
2003-06-03
2004-09-14
Adams, Russell (Department: 2851)
Optics: image projectors
Housing
C353S070000, C248S188200, C248S188800
Reexamination Certificate
active
06789904
ABSTRACT:
This application claims priority of Taiwan Patent Application Serial No. 091112658 filed on Jun. 11, 2002.
FIELD OF INVENTION
The present invention relates to an apparatus with a height-adjusting device, and more particularly, to a height-adjusting device for a projector.
BACKGROUND OF THE INVENTION
When projecting an image to a screen, a projector is often placed steadily on a platform, such as a desk. However, the position of the platform, such as the height and the horizontal, will affect the image projected. Sometimes, the image may even become distorted or deformed if the position is not appropriate. Therefore, an adjusting device for improving this kind of problem is usually disposed under the projector.
FIG. 4
shows a projector with a screwed adjusting device of the prior art. The adjusting device
408
of the projector
400
includes a supporting part
410
, a rack
404
, and a protrusion
414
. The supporting part
410
contacts a platform
402
and supports partial weight of the projector
400
. Friction exists between the supporting part
410
and the platform
402
. As users adjust the extended length of the adjusting device
408
, they must provide an external force larger than the friction to effectively screw the adjusting device
408
. This is quite laborious. Moreover, users have to screw the adjusting device
408
round and round to slightly increase or decrease the height of the projector
400
. It is quite time-consuming.
Another adjusting device as shown in
FIG. 5
has been disclosed in Japan Patent Application No. Hei 11-271879. The adjusting device includes a lever
510
, a rack
512
, and springs
514
A, and
514
B. The lever
510
is horizontally movably disposed in a housing
502
. A protrusion
510
A for accepting a pressing force from users is extended from the lever
510
out of the housing
502
. A moving part
510
B engages the rack
512
. In the natural circumstance, the elasticity of the string
514
A forces the moving part
510
B to engage the rack
512
so as to consolidate the adjusting device
508
.
While adjusting the adjusting device
508
, users must hold the projector
500
with one hand and push the lever
510
with the other hand to separate the moving part
510
B from the rack
512
. Then, the elasticity of the string
514
B will be strong enough to push out the rack
512
. After the height of the adjusting device
508
is adjusted and the lever
510
is loosened, the moving part
510
B engages the rack
512
again. The height of the projector
500
is then adjusted.
SUMMARY OF THE INVENTION
The objective of the present invention is to provide an electronic device with a height-adjusting device having a push button for user to adjust its height.
The adjusting device includes a connecting part, a supporting part, a push button, and a first elastic device. The connecting part connects with the housing and includes a groove and a rack. The push button is used for accepting a pressing force. The first elastic device engages the rack. The supporting, for example a leg, further includes a protruding part for connecting the first elastic device to the leg. To steadily keep the height of the leg, the electronic apparatus further includes a stopper for selectively preventing the first elastic device from deformation.
In addition, the adjusting device further includes a second elastic device. Before the second elastic device is pressed, the stopper is in a first position. The first elastic device is unable to deform or to move along with the rack due to the limitation of the stopper. When the push button is pressed, the stopper will be moved to a second position. After the stopper is pressed, the second elastic device deforms, and meanwhile, a deformation space for the first elastic device is generated. The first elastic device becomes able to move along with the rack to adjust the extended length of the leg. While the pressing force of the push button is gone, the elasticity of the second elastic device will force the stopper back to the first position and occupy the deformation space for the first elastic device. Therefore, the first elastic device can not deform or move along with the rack, and will steadily keep the position of the leg.
The advantages and spirits of the present invention will be further understood in reference to the following descriptions and accompanying drawings.
REFERENCES:
patent: 1280741 (1918-10-01), Hunn
patent: 6685149 (2004-02-01), Chang
patent: 6715890 (2004-04-01), Huang et al.
patent: 2002/0140909 (2002-10-01), Tanaka
patent: 2003/0227600 (2003-12-01), Chang
Merriam-Webster's Collegiate Dictionary, 1998, Merriam-Webster, 10ed, p. 32.
Adams Russell
Bednarek Michael D.
BenQ Corporation
Sever Andrew
Shaw Pittman LLP
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