用4米长角钢(?)60×40×5毫米或方木条两根,对接一头成角形,对角处系两根绳(或φ3毫米钢丝),角钢的两个脚弯个小直角边,固定在窗外边框的两个顶角。一个绳头系在上一层楼窗的下框,绳的长度能使角钢对角处吊起后与窗上框水平。另一根绳(称搭绳)沿上窗框下沿穿窗入室,长度能水平接在直对窗的内墙挂钩上(图 Use 4 m long angle steel (?) 60 x 40 x 5 mm or square wood bar, butt joints with one corner, two diagonal lines (or φ3 mm steel wire) at the diagonal corners, and two small angled sides of the angle bar , Fixed at the top corners of the window frame. A rope is tied to the lower frame of the upper floor window. The length of the rope enables the angles to be lifted at the opposite corners of the window frame. Another rope (called rope) along the window frame along the lower window to enter the room, the length can be horizontally connected to the window on the wall of the hook (Figure