窗扣一般都是“插销”或“摇手”，人动手才能关住。窗开了以后，若“回风扣”没有扣上，刮风下雨，窗就会随风急开总关，打破玻璃。如把门锁中的弹簧销舌（如图）移植到窗上，制成“弹簧窗扣”，风吹动窗子，就会家门样便能自动锁住。要开窗时，将手柄（3）向内一拉，锁舌（2 Window buckles are generally “latch” or “shake hands”, people can shut down. After the window opened, if the “return air buckle” is not buckled, windy and rainy, the window will be open with the wind rush to break the glass. Such as the door latch in the spring pin tongue (pictured) transplanted to the window, made of “spring window buckle”, the wind blowing the window, it will be home-like will be able to automatically lock. To open the window, pull the handle (3) inward to lock the tongue (2