Patent ID: 8740030

Claim:
A glass-breaking device, arranged to be mounted on a breakable substrate having a first pane and a second pane, and actuatable to break the panes of the breakable substrate, the device comprising: a base having a surface configured to be placed against the first pane; a plunger moveable with respect to the base from a retracted position in which the plunger is spaced apart from the surface of the base to an extended position in which the plunger is closer to the surface of the base relative to the plunger's retracted position; a first biasing element configured to bias said plunger toward said plunger's extended position, said first biasing element having a first spring rate; a pin having a distal end extending from said plunger and configured to strike the breakable substrate, wherein said pin is axially moveable from a retracted position to an extended position with respect to the plunger when said plunger is in said extended position; a second biasing element configured to bias said pin toward said pin's extended position, said second biasing element having a second spring rate which is less than the first spring rate of said first biasing element; wherein when said base surface is placed directly against the first pane of the breakable substrate, said plunger is actuatable to said plunger's extended position, whereby said distal end of said pin passes through the base and strikes and breaks the first pane of breakable substrate, and wherein when said plunger reaches said plunger's extended position, said pin moves to said pin's extended position, whereby said pin passes further through the base and said distal end of said pin strikes and breaks the second pane of breakable substrate that is parallel to and spaced from the first pane of breakable substrate.