Car Safety Hammer
Description
Here is a safety hammer, comprising of a blade to cut a seat belt and a hammer end to break windows.
PLEASE NOTE, I HAVE NOT ATTEMPTED TO USE THIS OR TEST IT.
Any other updates you wish to suggest, i can modify and update, or you can derive your own :)
Instructions
Print 'Blade', 'Handle' and 'fixing plate' for a 5 piece build (fits onto makerbot platform).
The 5 piece build allows 2 tone colour to be used.
Obtain a standard Stanley Knife Blade '11-921' found in 99E models.
Place blade into trapezium slot.
Using M8 Bolt, grind or file down tip to a point (not shown) and slot into hammer head. Use nuts to either space the bolt, or add weight to the hammer. If using a threaded hex head screw (M8 size), this is not required as they wont fit onto the screw thread.
Bolt both sides together using M5 nuts and bolts. I used 12mm in picture, but minimum for halfs is 16mm. (use glue to hold in blade if not completly held)
For 5 part build...
Using a small metal plate (or printed plate) fix bottom halves of both hammer and blade together, then place nuts bolts and blade and fit the top halves together.
I do recommend buying a safety hammer for real emergancies, but this was something i wanted to offer to the world.
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You should probably mention you are not liable for broken windows or cut seat belts.
Ideally the role of the safety hammer is to be used in the case of a roll over or worse. Seat belts are hard to undo when there is some weight pulling on them, hence the cutting portion of the hammer. Windows on vehicles are tampered and are designed to shatter if some amount of force impacts them; in the event of a roll over, the passenger will have to break the glass in order to escape from the vehicle. The fine point of the bolt may be enough to fracture the glass of the vehicle, which will weaken the strength of the glass every time it is impacted.
With some added weight behind the (impact) bolt, I believe this device will suffice it's purpose.
I wouldn't risk it and just buy a real safety hammer, just to be safe. Otherwise, nice design.
I like your utilization of simple household parts for the crucial components.
A few suggestions, make room for a solid core of say a M8 threaded rod and one end protruding 10mm or so. Reason being, give it more weight both in the tool and enable putting your own weight as part of a stabbing motion. Make sure to test it, especially with cold water and a bit of oil on your hand, so make it pretty rough. I suppose one would like to use it as leverage as well, so try standing on it with some hard and slippery shoes. Needless to say, without a blade in it and be careful. A design with the trusty mnemonic S.T.O.P. - Stop, Think, Observe and Plan. Its better to really be overdesign and overinformed on stuff like this than wish one wasn't.
Oh, if you are able too and want too, think about donating blood and/or plasma. Its always needed and you get a drink, sandwich, some cookies and a health-check! :)
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I bet that a small bit of ceramic from an old spark plug on the end of the hammer would work wonders for breaking safety glass.