Safety glass breaker

A window breaking tool, comprising:

• a striker piston housing;
• a firing pin piston housing extending back from the striker piston housing;
• a striker piston sliding in the striker piston housing;
• a striker extending forward from the striker piston, the striker having a pointed tip, the pointed tip having a half angle between 30 and 45 degree;
• a striker piston stop limiting forward travel of the striker piston to be between 0.04 and 0.1 inches of travel by contact of a forward facing step of the striker piston with a striker stop surface when the pointed tip of the striker is even with a forward face of the window breaking tool;
• a blank cartridge stop configured to position a blank cartridge facing the striker piston and residing between the striker piston housing and the firing pin piston housing;
• a striker housing chamber between the blank cartridge stop and the striker piston, the striker housing closed by positioning the blank cartridge in the blank cartridge position, the striker housing chamber having a volume between 0.16 cubic inches and 0.04 cubic inches when closed;
• a firing pin piston sliding in the firing pin piston housing;
• a fixed firing pin on a forward face of the firing pin piston aligned to fire the blank cartridge to create pressure in the striker housing chamber to propel the striker piston carrying the striker forward;
• a trigger attached to the firing pin piston and extending out through the firing pin piston housing to pull the firing pin piston rearward away from the blank cartridge position;
• and
• a spring applying forward force against the firing pin piston towards the blank cartridge position.

A window breaking tool, comprising:

• a striker piston housing;
• a firing pin piston housing extending back from the striker piston housing;
• a striker piston sliding in the striker piston housing;
• a striker extending forward from the striker piston, the striker having a pointed tip;
• a striker piston stop limiting forward travel of the striker piston to not more than 0.06 inches of travel by contact of a forward facing step of the striker piston with a striker stop surface, when the pointed tip of the striker is even with a forward face of the window breaking tool;
• a blank cartridge stop configured to position a blank cartridge in a blank cartridge position facing the striker piston and residing between the striker piston housing and the firing pin piston housing;
• a striker housing chamber between the blank cartridge stop and the striker piston, the striker housing closed by positioning the blank cartridge in the blank cartridge position, the striker housing chamber having a volume between 0.16 cubic inches and 0.04 cubic inches when closed;
• a firing pin piston sliding in the firing pin piston housing;
• a fixed firing pin on a forward face of the firing pin piston aligned to fire the blank cartridge to create pressure in the striker housing chamber to propel the striker piston carrying the striker forward;
• a trigger attached to the firing pin piston to pull the firing pin piston rearward away from the blank cartridge position;
• the trigger reaching out of the firing pin housing through a 0.9 inch long longitudinal slot in the firing pin piston housing, the slot including a recess at an end of the slot farthest from the blank cartridge position, the recess extending angularly around the firing pin piston housing and axially towards the blank cartridge position providing a cocked position for the trigger;
• and
• a spring having a free length of two inches and a spring rate of 8 pounds per inch and applying forward force against the firing pin piston towards the blank cartridge position.