Television – Special applications – Hazardous or inaccessible
Reexamination Certificate
2007-05-08
2007-05-08
Rao, Anand (Department: 2621)
Television
Special applications
Hazardous or inaccessible
C348S082000
Reexamination Certificate
active
10486359
ABSTRACT:
The present invention relates to a motor-less automatic retraction device that can insert a vision tube capable of monitoring the inside of a furnace to mange the internal state of the furnace and control the temperature of the furnace into the furnace and retract the vision tube from the furnace in a motor-less manner. A conventional retraction device is disadvantageous in that it is expensive, voluminous, difficult to install, thus requiring expert's help to install, and difficult to repair at the time of breakdown, and requires expensive repairing costs.In order to overcome the above-described disadvantages, an object of the present invention is to develop a motor-less automatic retraction device that can insert the vision tube into the furnace and retract the vision tube from the furnace using a spring, so the device is easily to install due to its small size and lightweight, is easy to repair, and allows repairing costs to be reduced.
REFERENCES:
patent: 4695881 (1987-09-01), Kennedy et al.
patent: 4840474 (1989-06-01), Heft et al.
patent: 6111599 (2000-08-01), Nance et al.
patent: 6239831 (2001-05-01), Eversole et al.
Arent & Fox LLP
Rao Anand
Youngkook Electronics
LandOfFree
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