Elevator hall call cross-cancellation device

US5357064A · kind A · utility

Assignee

• OTIS ELEVATOR COMPANY · US

Inventors

• Robert C. Boyce · Windsor, US
• Brian D. Ellsworth · Tolland, US
• David M. Hughes · Wayne, US
• Bertram F. Kupersmith · Avon, US
• Paul A. Stranieri · Bristol, US

Key dates

• Filing date: Dec 21, 1992
• Grant date: Oct 18, 1994
• Expiry date: Dec 21, 2012

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66B19/007
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A method and apparatus for dispatching elevator cars to hall calls in a system where there are two types of elevator controllers (12, 14) in operation, one (12) of which operates using relay logic. The calls are stored in a relay logic memory common to both elevator controllers (12, 14). A first controller reads the call information directly from the memory (18); the second controller reads the memory through a cross cancellation device (10) which multiplexes the information from the memory so that the calls are provided on a serial link (32) to the second controller (14). The second controller (14) is programmed to respond to calls which the first controller (12) has not answered.