Communications: electrical – Visual indication – Having light piping
Patent
1999-03-30
2000-11-14
Lefkowitz, Edward
Communications: electrical
Visual indication
Having light piping
340458, 340642, 73293, 25022714, 25022716, G08B 500
Patent
active
06147620&
ABSTRACT:
To sense the level of light in the passenger compartment 7 of an elevator cab 8, light at the proximal end of an optical fiber 4 is monitored by an optical detector 25 feeding a variable voltage divider 18, which allows setting a trip point at a desired level of light within the passenger compartment, thereby providing a signal indicating whether the light is adequate or not to a remote elevator monitoring apparatus 23. The trip point may be selected on installation by adjusting a potentiometer while watching an optical indication 17 of reaching the trip point, or it may be determined by software routines.
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patent: 4839527 (1989-06-01), Leitch
patent: 4880990 (1989-11-01), Rando
patent: 5386208 (1995-01-01), Coon, III
patent: 5747793 (1998-05-01), Sundburg et al.
patent: 5760711 (1998-06-01), Burns
Blackaby Barry G.
Remmers Timothy M.
Rogers William C.
Wurts William A.
Goins Davetta W.
Lefkowitz Edward
Otis Elevator Company
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