Appeal No. 2002-0431
Application 09/309,057
alternatingly in a clockwise and counter-clockwise
direction or in a vertical (up and down) direction. A
controller (not shown) may be provided to control the
drive means 76 such that it may provide both the
vertical and the radially oscillating motions
simultaneously for more effective cleaning. The drive
means 76 may further be provided such that the shaft 64
rotates in a uniform direction if such movement is more
advantageous than the oscillating movement for
achieving a high cleaning efficiency. The frequency of
the oscillating motion or the rotational speed of the
shaft 64 can be suitably controlled to achieve such
high cleaning efficiency. It has been observed that an
oscillating clockwise and counter-clockwise motion provides
one of the more efficient methods for cleaning chemical
deposits on the inside wall 46.[3]
. . .
A controller (not shown) first instruct [sic,
instructs] the drive means 76 to extend the shaft 64
fully or to a proper height inside the exhaust
conduit 54 depending on the location of the chemical
substances on the interior wall 46, the shaft 64 is
then activated by the drive means 76 to either turn in
a radial direction or oscillates [sic, oscillate] in a
clockwise/counter-clockwise direction such that the
scraping elements 72 frictionally engaging [sic,
engage] the inside wall 46 for removing the chemical
substances. The shaft 64 may also be moved in a
vertical direction simultaneously with the rotational
or oscillating motion to enhance the cleaning
efficiency.[4]
3 Specification, page 8, line 16 - page 9, line 6.
4 Specification, page 10, lines 11-17.
5
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Last modified: November 3, 2007