Safety: An auxiliary escape tool in a closed compartment. It is generally installed in a place that is easily accessible in a closed compartment such as a car. In an emergency such as a fire or a car falling into the water, it is convenient to take out and smash the glass window door to escape smoothly.
Uses: Mainly used to break the glass to escape in an emergency, hit the glass with a hammer, and the tail blade of the handle is used to cut the seat belt to escape.
Scope: Mainly used for bus, passenger vehicles, trains and other vehicle configurations.
How to use: The safety hammer mainly uses its conical tip. Since the contact area of the tip is small, the pressure of the contact point against the glass when using the hammer glass (not the pressure, but the pressure per unit area) Quite large, this is similar to the principle of the pushpin, the film is easily punctured, and the car glass is subjected to a large external force at this point to produce a slight crack, and for tempered glass, a little cracking This means that the stress distribution inside the whole glass is destroyed, so that numerous spider web cracks are generated in an instant. At this time, the glass fragments can be removed by gently rubbing with a hammer.
In addition, the middle portion of the tempered glass is the strongest, and the four corners and the edges are the weakest. The best way is to hit the edge and four corners of the glass with a safety hammer, especially in the middle of the upper edge of the glass. Once the glass has cracks, it is easy to smash the whole glass.
