craigdiver
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| posted on 13/10/17 at 09:55 PM |
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Rear seatbelt eye-bolt angle
I have a roll hoop which has a cross-member which will have the threaded bosses welded into it for the upper seatbelt mounts. The seatbelts clip into
eye bolts which are screwed into the bosses. Am I better welding the bosses vertically making the eye bolt pull sideways (shear force?) or am I better
mounting the threaded bosses angled towards the seatbelt so the force is trying to pull the threads out of the boss?
Any thoughts?
[Edited on 13/10/17 by craigdiver]
If it ain't broken, fix it anyway (just because).
Building - BMW powered Haynes Roadster/442E hybrid.
Volvo C30 T5 Polestar
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daviep
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| posted on 14/10/17 at 08:52 AM |
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Eye bolt is far stronger inline than at an angle, for lifting applications eye bolt rating is reduced to 25% of safe working load when pulled at
90degrees, i.e. 1000kg eye bolt is only good for 250kg at 90 degrees to the thread. I would presume the theory is the same regardless of
application.
In practice I guess it doesn't matter as the majority of harness mounting points in real life tend to be at 90 degrees e.g lap belts down the
side of seats or shoulder straps on to the top of bar behind seats.
If using at 90 degrees they should be orientated so that the hook pulls on the side of the ring as opposed to the top of the ring, use a thin shim
below eye bolt so that orientation is correct when the eye bolt is tight, if you need shim give me a shout.
Regards
Davie
“A truly great library contains something in it to offend everyone.”
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Angel Acevedo
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| posted on 23/10/17 at 01:52 PM |
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If you reach eyebolt breaking limit, you may be dead already...
I would think surrounding structure will be the limiting factor...
Or the belts...
quote:
Originally posted by daviep
If using at 90 degrees they should be orientated so that the hook pulls on the side of the ring as opposed to the top of the ring, use a thin shim
below eye bolt so that orientation is correct when the eye bolt is tight,...
Regards
Davie
A small O ring may act as a shim and it would give some adjustability..
Once you install the belts, the eyebolts can´t unscrew.
HTH
Beware of what you wish.. for it may come true....
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loggyboy
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| posted on 23/10/17 at 02:09 PM |
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MSA state sheer is preferable to traction:
Mistral Motorsport
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craigdiver
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| posted on 23/10/17 at 02:30 PM |
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quote:
Originally posted by loggyboy
MSA state sheer is preferable to traction:
I can understand the logic behind this for a tab mounted seat belt as the shear force is applied directly where the bolt enters the threads, however,
with an eye bolt the shear forces, I imagine, would be far greater.
If it ain't broken, fix it anyway (just because).
Building - BMW powered Haynes Roadster/442E hybrid.
Volvo C30 T5 Polestar
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