Rebound Control

[smackeen]

Can someone help me explain how the extra rebound control on the compliant 2012 seats work to help?

I have it in my head, but just cannot get it down on paper.

 

[Pixelated]

I'm not quite sure what you're meaning - but the structure of the seat (often with bolsters the are larger and angled towards the seat back a bit) stop the seat from rebounding past the threshold amount. Some seats do this with an anti-rebound bar but accomplish the same thing. Some seats, like the Scenera, didn't require any modifications to pass the new standard. Infant seats are using the handle in the up position to pass, or anti-rebound. Baby Trend doesn't use that so it must be fine without.

 

[smackeen]

Pretty much what I was looking for. Someone asked how the rebound bar worked on the true fit and I tried to explain how all new seats have some sort of rebound control (infant=handle, true fit=bar and other seats boulsters).

This is all I could think to write...lol It does not prevent rebound, but it helps with the rebound force on the seat.

 

[Pixelated]

It prevents rebound past a certain point. Imagine a line drawn vertically from a point somewhere near the seat bight (on a test bench). I don't recall what's being measured - a point on the dummy's head? - but whatever that standardized point is, it can't cross the imaginary vertical line. Different seats achieve that in different ways. I can find the more exact specs later if you'd like.

 

[FrauDrA]

Just curious: doesn't RF tethering offer rebound control (isn't that the purpose of RF tethering?)? Why isn't it allowed on more seats? Seems that would've been an easy way to be compliant - or am I just not understanding?

 

[tiggercat]

Just curious: doesn't RF tethering offer rebound control (isn't that the purpose of RF tethering?)? Why isn't it allowed on more seats? Seems that would've been an easy way to be compliant - or am I just not understanding?

I believe the RF tether cannot be mandatory, seats have to pass without it. Firstly because the test bench doesn't have a floor, so it is not used in compliance testing. Second because many manufacturers of vehicles prohibit RF tethering with wording in their manuals about not pulling or pushing on seat backs or tracks due to advanced airbags. Third, in some vehicles you cannot find a suitable RF tether point. Finally, it may be undesirable to tether for some age groups (newborns a d young infants) because of concerns over neck loads.

Sent from my iPod touch using Car-Seat.Org

 

[amyd]

Just curious: doesn't RF tethering offer rebound control (isn't that the purpose of RF tethering?)? Why isn't it allowed on more seats? Seems that would've been an easy way to be compliant - or am I just not understanding?

Yes, it does. But there's no way to test it because the sled doesn't have a floor. Plus North American vehicles don't have designated RFing tethering anchors.

 

[smackeen]

It prevents rebound past a certain point. Imagine a line drawn vertically from a point somewhere near the seat bight (on a test bench). I don't recall what's being measured - a point on the dummy's head? - but whatever that standardized point is, it can't cross the imaginary vertical line. Different seats achieve that in different ways. I can find the more exact specs later if you'd like.

Thanks!

If you could, that would be great!

 

[Pixelated]

I think this is the 'gibberish' referring to the anti-rebound standard So...for all of those seats that underwent structural changes in order to pass, this is what they're passing, either with bolsters, anti-rebound bars, or something else.

(a) retain the torso of the anthropomorphic test device within the restraint system, and not allow any portion of the target points on either side of the device’s head, located on the transverse axis passing through the centre of mass of the de- vice’ s head and perpendicular to the head’ s mid- sagittal plane, to pass at any time, during or immediately after the test, either through the transverse orthogonal planes formed by the ex- tension of the seat back frontal surface plane of the restraint system and by the plane that passes through the uppermost point of the restraint sys- tem, as shown in Figure 7 of Schedule 7, or through the vertical transverse plane passing through point X on the standard seat assembly, as shown in Figure 8 of Schedule 7;

The above quote, and the attached schematic are from here: http://laws-lois.justice.gc.ca/eng/regulations/SOR-2010-90/20100429/P1TT3xt3.html