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Author: Subject: Seatbelts
David Jenkins

posted on 8/8/19 at 03:05 PM Reply With Quote
Seatbelts

Lately I've been thinking about changing my 4-point harnesses to conventional inertia lap-and-diagonal types. Various reasons for this, including:

  1. I am continually having to adjust the 4-point belts, partly because I've lost a hell of a lot of weight, and partly due to changing weather conditions (t-shirt in the current warm weather, thick fleece and waterproofs in the winter). I just want something I can grab and plug in, regardless of what I'm wearing.
  2. The current belts are a pain for my passengers - every time a different person gets in they have to spend 5 minutes faffing about to get them somewhere near right - and often fail.
  3. I don't do racing or even track days - just normal road use.
  4. I put the seatbelt fixing points in according to Ron Champion's instructions - and they're not much use for 4-point harnesses as they were intended for lap-and-diagonal. This means that if I do everything up tight the lap strap is across my giblets instead of my pelvis - not good. For 4-point harnesses the lower points need to be more forward than the lap-and-diagonal ones, and preferably at floor level.
  5. I have a very sturdy braced roll bar that can safely take the upper swivelling pivot for lap-and-diagonal belts, and I'm reasonably happy to add fitments to take the top fixing.

So, my question is - has anyone else fitted inertia lap-and-diagonal belts to a Locost and, if so, how did you do it?
Note: I have a Westfield build manual that describes the building of a car amazingly similar to a Locost and it describes how to fit this kinds of belt to their cars. I would probably follow their guidelines if nothing else looked better)





The older I get, the better I was...

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ianhurley20

posted on 8/8/19 at 09:17 PM Reply With Quote
Last year I was involved in an accident when my Haynes Roadster was written off. I had 4 point seatbelts fitted. Because it was cold I was wearing more clothing than usual and it was a real pain to get the belts closed so I was really tightly strapped in. 45mph on straight road in torrential rain my car aquaplaned and I hit the hedge and ripped off the left hand corner of the car.
Two things.
I am so pleased I was wearing more clothing that effectively tightened my belts more than I would usually have. It saved me a lot of injury.
I am so glad I didn't have the lap and diagonal belts fitted to friends Westfields, I would have been seriously injured in my accident.

Your choice, I know what mine would be.





My build blog http://ianhaynes20.wordpress.com IVA passed 3/10/16
written off 23/9/18
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voucht

posted on 9/8/19 at 08:27 AM Reply With Quote
Hi,

I had to change back and forth from 4 point harnesses to regular seatbelts because of the different inspections and change of country.

I bought the inertia ones from CBS, the ones you can fit the rolling unit in any position (vertically or horizontally), with the long stalk. I first had the short stalk ones, but the stalks were really too short and very hard to find when you wanted to buckle up.

https://www.carbuildersolutions.com/uk/securon-multi-angl e-retractable-long-stalk-black

I used 3 of the 4 attach points of the harnesses. On the Haynes, upper attach points are on the roll bar, so the rolling unit of the seat belt is installed on the inner points. Outer points were not possible because too much "behind" the seat. I blanked them with a bolt, and a bolt head cap. So the diagonal strap is the other way around than on conventional cars.

A more aesthetic solution would have been to fit the rolling unit on one of the lower point, but there was not enough room there for achieving that.

Here are a few picture of the set-up:

Description
Description


Description
Description


Description
Description


Description
Description


Description
Description


It does nor look very good, but it does the job.

Hope that can help





Sylvain
http://vouchtroadster.blogspot.se/

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40inches

posted on 9/8/19 at 11:33 AM Reply With Quote
Some answers in this thread https://www.locostbuilders.co.uk/forum/24/viewthread.php?tid=212907
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David Jenkins

posted on 9/8/19 at 02:52 PM Reply With Quote
quote:
Originally posted by 40inches
Some answers in this thread https://www.locostbuilders.co.uk/forum/24/viewthread.php?tid=212907


Hmm - I'd completely forgotten that thread! It was not much over a year ago too... must be old age!





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Angel Acevedo

posted on 13/8/19 at 01:33 AM Reply With Quote
quote:
Originally posted by voucht
Hi,

I used 3 of the 4 attach points of the harnesses. On the Haynes, upper attach points are on the roll bar, so the rolling unit of the seat belt is installed on the inner points. Outer points were not possible because too much "behind" the seat. I blanked them with a bolt, and a bolt head cap. So the diagonal strap is the other way around than on conventional cars.

A more aesthetic solution would have been to fit the rolling unit on one of the lower point, but there was not enough room there for achieving that.

Here are a few picture of the set-up:

Description
Description


Description
Description


Description
Description


Description
Description


Description
Description


It does nor look very good, but it does the job.

Hope that can help



I don´t thik this arrangement would be of any help if you are rolling in the car...
As you may slip outward under the inner side shoulder belt.

This is only my point of view based on uneducated assumptions.

I will be using 4 point harnesses.





Beware of what you wish.. for it may come true....

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voucht

posted on 16/8/19 at 12:27 PM Reply With Quote
quote:


I don´t thik this arrangement would be of any help if you are rolling in the car...
As you may slip outward under the inner side shoulder belt.

This is only my point of view based on uneducated assumptions.

I will be using 4 point harnesses.


Most of the convertibles produced in the world have regular 3 points seat belts, sometimes not even with a roll bar or roll hoops.

In Sweden, you can't have your kit car road legal with a 4 points harness, and you must have regular 3 points seat belts (that is the reason why I had to change my 4-point Sabelt harnesses to 3 points seat belts), and Sweden is far from being the most unsafe and sloppy regulated country in the world

In a seven-like car, like in a convertible, and unless you have a full roll cage, if the car flips over, you are probably dead, even with a 4 points harness in my humble opinion. And I hope it will never happen to any of us.

So, in our cars, the safest seat belt arrangement is to keep the 4 wheel on the road

[Edited on 16/8/19 by voucht]





Sylvain
http://vouchtroadster.blogspot.se/

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