Appeal No. 2003-1570
Application 08/748,986
V. The 35 U.S.C. § 103(a) rejection of claims 17 through 19, 22
through 28 and 30 through 38 as being unpatentable over Rudak in
view of Bayer
Rudak discloses a method of operating a liftcrane so as to
change the inclination of its jib or boom 20. To this end, the
liftcrane includes, inter alia, winding drums 1 and 2, cables 6
and 7 having first ends wound on a respective drum and second
ends coupled to each other by a loop 5/stop 22, a series of
blocks or pulleys 8 through 13 mounted respectively on the jib
and crane substructure and over which the cables run, a series of
terminal switches 23 through 27 for sensing movement of the loop
5/stop 22, and a mechanism for controlling the operation of the
winding drums in response to the sensed movement of the loop
5/stop 22 (see pages 3 and 4 in the translation). As is evident
from Figure 1, the movement of the loop 5/stop 22 is indicative
of the relative amount by which the first ends of the cables 6
and 7 are taken up by the drums 1 and 2. The mechanism for
controlling the operation of the winding drums in response to the
sensed movement of the loop 5/stop 22 by the terminal switches
halts operation of the winding drums if switches 24 and 27 are
tripped, and includes a manually operated change-over switch 38
and push-buttons 37 for moving the loop 5/stop 22 back to its
neutral position through rotation of one of the drums.
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