Appeal No. 2003-1220
Application No. 09/830,420
supplied along with drive monitoring unit signals to a pilot
control unit. On detection of an error by the safety chain or
drive monitoring unit switching elements, a shutdown signal is
supplied to a shutdown contact.
Claim 14 is illustrative of the invention and reads as
follows:
14. A method of disconnecting passenger conveying
systems comprising the steps of:
monitoring functional units of a passenger conveying
system with switching elements to detect malfunctions of the
passenger conveying system, wherein signals from the
switching elements of the functional units are combined to
form a safety chain;
supplying signals from the functional units and signals
from a drive monitoring unit of at least one drive of the
passenger conveying system to at least one pilot control
unit;
supplying a shutdown signal, after the step of
supplying signals to the at least one pilot control unit, to
a shutdown contact of the at least one drive of the
passenger conveying system when at least one error is
detected by at least one of the functional units and the
drive monitoring unit.
The Examiner relies on the following prior art:
Loshbough 3,580,376 May 25, 1971
Sakata et al. (Sakata ‘653) 5,083,653 Jan. 28, 1992
Iwata 5,107,975 Apr. 28, 1992
Zaharia 5,186,300 Feb. 16, 1993
Sakata et al. (Sakata ‘256) 5,526,256 Jun. 11, 1996
Zaharia et al. (Zaharia ‘178) 5,601,178 Feb. 11, 1997
Zaharia et al. (Zaharia ‘416) 5,708,416 Jan. 13, 1998
Balzer-Apke et al. (Balzer-Apke) 6,230,871 May 15, 2001
2
Page: Previous 1 2 3 4 5 6 7 8 9 10 Next
Last modified: November 3, 2007