easy break hammer / easy break hammer

Easy break hammer is a security installed on buses to escape with hammers,
Usually easy break hammer vertical fixed between two Windows, easy break
Hammer is made of elastic material, the installed on each end of the two gold
A ball.When an emergency occurs before easy break hammer rotates 90 °, so
Easy break one end of a hammer opened after a certain distance and release,
easy Break of Hammer's own material elastic metal ball and smashed the glass,
so as to escape.