Patent ID: 7328662
Filing Date: 2008-02-12
Classification: B61B,E05Y,G01V,Y02T

Abstract:
1. A platform gate door device comprising: a platform gate door installed on a platform at a position where passengers get on and off a vehicle; a door control device for opening and closing the platform gate door; at least two photoelectric obstacle detectors disposed between the platform gate door and the vehicle for detecting a presence of an obstacle, wherein each obstacle detector has a light emitter and a light receiver disposed on either side of an opening of the platform gate door, and wherein the at least two obstacle detectors are arranged so that the directions of emission of the light emitters are in first and second directions that are mutually inversed from each other; and a switching means for activating one of the at least two obstacle detectors based on movement of a disturbance light, wherein the one obstacle detector being activated is switched so as not to receive the moving disturbance light; wherein the switching means operates to perform the switching process according to time, and wherein during first time period, the switching means activates the obstacle detector having its light receiver disposed along the first direction while during a second time period the switching means activates the obstacle detector having its light receiver disposed along the second direction.