Mick F wrote:mjr wrote:Mick F wrote:I blame the helmet straps and fixings. It could happen to anyone. The clips are designed to be secure and the straps are strong. There is no "weak-point" to give way. All helmets are the same as far as I know.
https://www.satra.com/ppe/EN1080.php is different to the adult helmet standard EN1078 in requiring "The helmet retention system must be capable of self-release if the wearer becomes trapped by the helmet and there is a risk of strangulation." Now you know! I wonder why that helmet didn't.
The retention system must fail (i.e. release) under a force of between 90 and 160 Newtons. To illustrate the weight or mass involved, 160 Newtons is the force applied by a mass of about 16kg.
16Kg?
That's 35lbs in real money.
Two and a half stone.
That's pulling vertically.
Back later with some info.
I was out today loading stuff in a container .................. long story, and irrelevant to my following statement.
I got hold of a childs' bicycle helmet and connected up the strap with its clip.
I'm a strong chap. Strong in the arm and strong in the hand.
I couldn't pull the strap apart no matter how I pulled.
I told the story of the poor four year old, and showed the people around - including a couple of cyclists - of how the damned thing wouldn't release in the slightest.
I wasn't the only one trying. I passed it on to other people to try.
Not one single person, man or woman, could pull it apart.
What a stupid stupid stupid stupid
stupid stupid design.
Mick F. Cornwall