Elevator – industrial lift truck – or stationary lift for vehicle – With barrier for regulating access to load support – Includes motor or motor driven linkage for shifting barrier
Patent
1995-08-02
1997-12-16
Nappi, Robert
Elevator, industrial lift truck, or stationary lift for vehicle
With barrier for regulating access to load support
Includes motor or motor driven linkage for shifting barrier
187392, B66B 1326
Patent
active
056988249
ABSTRACT:
In a lift installation in which a multi-beam curtain (primary beam) extends across a lift car door opening, auxiliary transmitters direct secondary beams towards a detection zone in front of landing doors. The multi-beam curtain is intercepted by a passenger entering the lift to prevent premature door closure. However, premature closure is also prevented when a passenger stands in front of the landing doors, thereby causing some of the secondary beam to be reflected onto auxiliary receivers. This provides a low cost solution to the problem of non-detection of an obstruction in the closing path of the landing doors, but not intercepting the primary beam system and also provides an increase in the passenger convenience of the lift, as the doors are held open for a passenger approaching the lift, but not yet interrupting the primary beams.
REFERENCES:
patent: Re30719 (1981-08-01), Mills
patent: Re33668 (1991-08-01), Gray
patent: 4029176 (1977-06-01), Mills
patent: 5142152 (1992-08-01), Boiucaner
patent: 5149921 (1992-09-01), Picado
Memco Limited
Nappi Robert
LandOfFree
Lift installation with primary and secondary transmitter receive does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lift installation with primary and secondary transmitter receive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lift installation with primary and secondary transmitter receive will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-208927