Patent ID: 6631788
Filing Date: 2003-10-14
Classification: B66B

Abstract:
An elevator system having a pair of horizontally opposed vertical frame portions, upper and lower vertically opposed horizontal frame portions connecting uppermost lowermost ends of the vertical frame portions respectively, the opposed vertical and horizontal frame portions defining an opening therein, and a slide door moving horizontally to open and close the opening, comprising:a first optical device having a light emitter for emitting light and a second optical device having a light detector for detecting the light emitted from the light emitter, wherein one of the first and second optical devices is positioned in one of the opposed vertical frame portions and the other of the first and second optical devices is positioned in the upper horizontal frame portion and adjacent to the one vertical frame portion, so that light from the first optical device travels toward second optical device along a gap defined between the slide door and the one vertical frame portion.