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Electrically expanded seatbelt and airbag

Sorry gang, no toxic azide explodey things needed.
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A seatbelt of apparently normal width but really made of several layers folded or pleated, and interwoven with combinations of electrical wires, magnets, or tubing containing MHD fluid. During sudden deceleration, a super capacitor fires a charge through the belt which rapidly unfolds to a much broader strap able to hold the occupant in place with less bruising than a narrow belt. A similar system could be used to deploy expanding cushions where airbags are commonly used now (from the steering wheel, passenger side dashboard fascia, side windows, etc.

All without the use of chemical explosives. I know that will disappoint some bakers, but it will make servicing (and eventual decommissioning) of vehicles a little and safer.

um… as long as you remember to drain the supercap…

a1, Jun 13 2021

Other tech https://pubmed.ncbi.nlm.nih.gov/26148123/
Sliding seats to decelerate you slower. [neutrinos_shadow, Jun 13 2021]

prior art (by pashute) Seat-belt energy spread
[pashute, Jun 15 2021]

[link]






       i like the light weight of air bag material and seat belt material. i am a bit skeptical of the weight impact of adding a bunch of metal to these items.   

       here are two similar ideas:   

       1. giant railgun that fires in the direction of the impending collision to equalize speed relative to the approaching car/barrier/etc.   

       2. fill the passenger compartment with an assortment of cats, which also // rapidly unfolds to a much broader // configuration if they experience acceleration and/or static electricity.
sninctown, Jun 13 2021
  

       From what I've seen (not very much...) nitinol reacts quite slowly. I would expect MHD fluids to pretty slow too; at least compared to the milliseconds required by crash mitigation systems.
neutrinos_shadow, Jun 13 2021
  

       Actually, MHD can react really, really fast - it’s used in active suspension systems in high end cars. I hope our resident automotive engineer will be around shortly to weigh in.
a1, Jun 14 2021
  

       Well, that's my "learn something new every day" taken care of for today.
neutrinos_shadow, Jun 14 2021
  

       An oil/ferrous metal filled seatbelt might not be so svelte as to be convenient to use. Why not have a similar system but with a gas-filled bladder inflated by a smaller version of the airbag system?   

       //I would expect MHD fluids to pretty slow too; at least compared to the milliseconds//   

       //MHD can react really, really fast//   

       Yup, no problems with speed here. You're using it as a modifier of hydraulic damping, you can move almost as fast as FETs can switch, which is fast.   

       //All without the use of chemical explosives. I know that will disappoint some bakers,//   

       You're beyond that, you're getting close to disrespecting the dead :).
bs0u0155, Jun 14 2021
  

       On further thought, how are you getting an MHD system to produce rapid movement? MHD is essentially an electomagnetic modifier of oil damping. In car dampers, all the force is supplied by a spring system, the MHD is just an electronically modifiable resistance proportional to velocity.   

       Also, supercapacitor, wires, across chest... possibility of wear/damage.... I can see something going wrong here.
bs0u0155, Jun 14 2021
  

       // Also, supercapacitor, wires, across chest... possibility of wear/damage.... I can see something going wrong here. //   

       Well there you go, the perfect HB idea. That should make up for the lack of traditionally explodey things.   

       Re MHD, I mainly threw it into a long list of things that could get a coiled / folded up structure to unfold really fast.
a1, Jun 14 2021
  

       prior art
pashute, Jun 15 2021
  

       Thanks [pashute] - I do recall your earlier idea and it may have planted the seed for mine. I didn’t know about Ford’s expandable seatbelt (mentioned in one of your idea’s annos/links) but that still relies on compressed gas and a small explosive charge.   

       I want my seatbelt (and other airbag-like cushions) to expand with electromagnetic force - that's the only novelty here.
a1, Jun 15 2021
  
      
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