Hi guys,
A question about the seat reference point. I know about the 136x53mm block as per annex4.


Seat reference point


Here is my question. How will this be checked by the inspector? What is the third dimension of the distance block? At what angle will the block be placed?

This does make a difference as the part of the seat where your bum is going to be is hollow sphere-shaped. See picture:



Seat reference point question

[Edited on 4/11/08 by maartenromijn]

They didn't try the block on mine. Had a look and decided it was ok.

I think it's just down to the testers interpretation and experience. It looks clear on paper but in reality its not.

adrian

It makes all the difference in designing the upper anhorage points. Maybe I need to raise them 2 inches above the rear member.
Because it will create a torsion in the member, I need to lead the force further down to the diagonal member...

Have the measurements actually been checked in someone's car? How are the measurments performed?

[Edited on 4/11/08 by maartenromijn]

The third dimension is unimportant just the length from seat back and the distance above the furthest point away.
The tester will use a purpose built gauge with adjustable angle and a bit of string.
If the seat belt goes through the seat then the seat belt hole is the reference point and must be structurally capable of taking the loads, so you can route the seat belts around the seat then the seat belt top mounting must be as high or higher than the reference point.

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Originally posted by

Have the measurements actually been checked in someone's car? How are the measurments performed?

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