Elevator – industrial lift truck – or stationary lift for vehicle – Having computer control of elevator
Patent
1995-08-07
1997-08-05
Nappi, Robert
Elevator, industrial lift truck, or stationary lift for vehicle
Having computer control of elevator
187391, 370228, B66B 128, H04J 116
Patent
active
056545312
ABSTRACT:
An elevator system comprises a plurality of cars, and a group controller. A pair of multidrop communication links are connected with the cars such that, absent a communication break, a datagram transmitted by any car controller onto either link may be received by any or all of the remaining car controllers. Each car controller includes means for designating a primary link for each of the remaining cars, and means for rebroadcasting datagrams intended for another car on the primary link only when the datagram is received on a link other than the primary link.
Preferably, each controller includes a means to determine when communications with another car, over the primary link, have been disrupted, and to switch the designation of primary link accordingly. In the preferred embodiment, a timer means is associated with each car, which is reset each time the car receives a datagram originating from that car. If the timer expires, and subsequently the car receives a datagram from such car over another link, it resets the primary link.
The group controller may be a separate component of the system, but preferably all the car controllers have group controller software.
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Farabee Larry A.
Leeson Michael J.
Delaware Capital Formation Inc.
Nappi Robert
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