本装置结构简单,不消耗能源,不改动原有的电路,经过试用,情况良好。其工作原理如下(见附图)。本装置由拉线开关绳1,限位圆环4,支撑滑轮3、5,橡皮筋6,眼圈螺丝8等组成。电灯的亮与灭是由拉线开关1控制的,当人们去厕所拉门时,门通过固定用眼圈螺 The device has a simple structure, does not consume energy, does not change the original circuit, and is in good condition after trial. Its working principle is as follows (see the attached figure). The device is composed of a pull wire switch rope 1, a limit ring 4, a support pulley 3, 5, a rubber band 6, an eye ring screw 8, and the like. The light of the electric light is controlled by the pull switch 1. When people go to the toilet to pull the door, the door passes through the fixed eye.