Seat Belt Locking Mechanism 2

[Chel80]

I am designing a wirelocking(size of wire .125") system using the principle of seat belt locking mechanism in cars. The wire is run in to the pipe at a constant rate when it shears, the wire is lost. Hence the design. I was unable to find a reference of the seat belt mechanism in the net. Which would be the best possible source to find the working principle(with schematics).

 

[FrenchCAD]

Look for patents, you might find some descriptions.

European office of patents at

http://www.european-patent-office.org/index.en.php

Cyril Guichard
Mechanical Engineer Consultant
France

 

[GBor]

US Office:

http://www.uspto.gov

 

[HemiBuell]

flyingpig.com or howstuffworks.com

 

[JimCasey]

Not to be overly pragmatic, but go to your "Automotive recycling facility" and buy some retractors. Take 'em apart and marvel at the cleverness. There is a centrifugal element that reacts to how quickly the belt is being pulled from the internal spool, and there is also a pendulum device that locks the spool if the car's instantaneous gravitational vector gets very far from vertical( acceleration, rollover, etc.)

 

[thermcool]

Make sure when you experiment with the structure of the seat belt
The spring is winded inside the belt that help in the winding of the belt.If you try to open the belt be cautious sometime the spring recoils out with great force.

Second thing, you can only pull out the belt from the assembly only if it place in the orientation that it is fixed inside the car.

I had a chance to replace the seat belt inside my car, when I observe these problems. Might be it will help you.

 

[Cockroach]

Why not use a principle similar to that in the wireline industry, oilfield technology?

When a wireline is attached to the Fish Neck of a Top Sub, it is simply threaded into a hole, like threading a needle. A set of pawls located in slots then grab the wire. As the wireline tension increases, the pawls grab the wire harder. Thus you have a situation where resistance to slip is proportional to wireline tension.

I have used this mechanism extensively, most recently to grab a wire specimen for a Universeral Testing Machine. We got a good stress/strain curve on the wire without slippage. Most importantly, the wire broke at a location other than where the pawls had grabbed it.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

 

[mloew]

Patent sites are listed in the FAQ Patent Databases (faq404-887).


Best regards,

Matthew Ian Loew


Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[mloew]

Also, the Flying Pig website you are looking for is

http://www.flying-pig.co.uk/mechanisms/index.html

Best regards,

Matthew Ian Loew


Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[unclesyd]

The simplest cable grabber is the splicer use to repair electrical distribution lines. I don't know the name of it, but power company used tons of them after the hurricanes. Al or Cu, it made no difference.

Tried to call the Power Company and couldn't get pass the press 1,2, or 3 crap.