Patent ID: 6715586
Filing Date: 2004-04-06
Classification: B66B

Abstract:
An upgraded elevator control apparatus functional in a building and comprising in combination: an elevator control circuit having a phase 1, alternate and phase 2 input circuits; and an upgrading circuit; the upgrading circuit providing a switching means enabled for placing a first variable impedance across a door motor armature of the elevator control circuit thereby enabling a selected door closure speed; the switching means further enabled for placing a second variable impedance in series with a door motor field of the elevator control circuit thereby enabling a selected door operating torque; the upgrading circuit further providing a means for logically enabling the first and second variable impedances when an input signal is present at, at least one of the phase 1 and the alternate input circuits of the elevator control circuit, and for logically disabling the first and second variable impedances when an input signal is present at the phase 2 input circuit of the elevator control circuit, the apparatus further comprising means for sensing smoke on at least two floors of the building and for communicating with the logically enabling means for overriding optical door control and enabling the first and second impedances when smoke is sensed on at least one of the at least two floors of the building.