#1230: CooledTool

Machine-assembled glazing units are inherently hard to break through -even when one is fortified by adrenalin in an emergency.

Today’s invention is an update to the standard glass-breaking escape hammer often found on public transport.

It takes the form of a conventional hammer, modified by the inclusion of a small, very high-pressure gas cylinder. When the hammer impacts the window surface, this breaks a seal on the cylinder allowing the gas to rush out. This expansion can be arranged to be sufficiently energetic that the glass surface becomes rapidly cooled locally and therefore embrittled.

This in turn allows the hammer to penetrate the window much more easily (a similar system might be used instead of detonator cord in the canopies of fighter jets with ejector seats).

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