Patent ID: 6495933
Filing Date: 2002-12-17
Classification: B61D

Abstract:
A powered trap door device for a vehicle including a trap door hinged at a floor of a vestibule with steps of the vehicle and a sliding vehicle door, comprising:a screw driving mechanism that opens/closes the trap door including an electric motor and an electromagnetic brake for driving said screw driving mechanism; a first limit switch for detecting opening of the sliding door of the vehicle; a second limit switch for detecting closing of the trap door, the trap door being openable only when the sliding door is opened and the sliding door being closable only when the trap door is closed; and a sensor of a periphery monitoring system provided on the vestibule to check safety of a peripheral area of the trap door, wherein the trap door can be opened/closed by the electric motor with the electromagnetic brake after the periphery monitoring system has checked safety.