一、 电梯的冲顶事故北京市某房管所一幢24层楼的M-BDS电梯，由于维修工在作业时忘记了拔出开闸扳手，随着电梯运行的震颤，扳手越插越紧，最终导致了抱闸无法闭合。这时电梯回到一层，维修工正欲从轿里撤出，却发现电梯自动上行，正犹豫间只见电梯移动越来越快。他打下轿顶急 First, the elevator overhead accident Beijing a house management a 24-storey M-BDS elevator, maintenance workers in the operation forgot to pull out the gate wrench, as the elevator tremors, the wrench more inserted more tight, and ultimately Resulting in the brake can not be closed. At this time the elevator back to the ground, maintenance workers are trying to withdraw from the car, but found that the elevator automatically upward, hesitating saw the elevator moving faster and faster. He laid the car urgency