Seat belt anchorage support frame?

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Heath
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Seat belt anchorage support frame?

Post by Heath »

Got a sticky one that I want to bounce around before I have a chat to the certifier. I have a few ideas below that may sort my issue but figured I'd see if anyone else has had similar issues and how they addressed them.

The cab I am using has a removable roof/rear section which I intend to run as a convertible. My issue is that if I fit a support frame it has to be at least 700mm hight to allow for fitting the seatbelt point being high enough, but then I cant put the diagonal brace back against the rear of the cab within the allowable tolerances as the cab rear is only 400 high.

I dont want to run the support bars out the back of the cab through the rag top because then I cant fit the hard top and it would look like shit with them going into the tray area.

I note the stays must not be on an angle of more than 70 degrees from the main hoop but it doesnt actually say in which direction it must go. Could I take the braces from one side to the other (X braced)? It does say in the manual the diag brace can go either forward or rearward so that might screw my idea, but if the mounting point is behind the main hoop then technically it has gone rearward... :?

The bar will run up against the rear of the cab (actually touching) at the top of the cab base at 350-400mm so could I use a bracket that attaches directly to this strong area or perhaps run a brace or braces directly off the back of the bar onto a plate against the cab rear and put a doubler plate outside the cab?

As an aside the old mounting system was through the b pillar but is in front of and above the allowable area for the mounting point. I could use the factory point but that only works if I stay with the hard top (whats the point in that?) and I'm guessing I would have to reinforce it anyway because the steel is pretty thin there. Same issue if I move the mount to between the windows behind the seat where the metal is pretty thin too. My preference is to use a solid bar which will give me a little more confidence than the old tin toyota used. In the event of an incident I dont want to be sitting in a hospital thinking I could've done better
ChurchurDan
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Re: Seat belt anchorage support frame?

Post by ChurchurDan »

A mate of mine has a fiberglass fj45 He put a hoop behind the rear seats with the diagonal braces extending forward on a downward angle between the seat and door. The floor plate for the diagonal brace is about half way between the front of the seat and the bottom of the A pillar so it is still easy to get in and out off. The seat belt is attached to the hoop top and bottom and the buckle is attached to the lower cross brace.
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Heath
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Re: Seat belt anchorage support frame?

Post by Heath »

Dont want to run braces forwards if I can avoid it.

Might have a solution.

Image
Current back is too low for the belt anchorage to brace against.
Image
The white bar is at the height the top belt mount must be at (or as close as possible to it)
Image
Fabricate a new rear section for cab 200mm high.
When I cut the doors it will be the same height.

Will be less exposed to back drafts and will be a better height compared to the tray. Just had to go for a walk and think it out.

:mrgreen:
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mercutio
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Re: Seat belt anchorage support frame?

Post by mercutio »

will look cleaner that way i reckon
my 4wd is not a truck

old mercedes never die but sometimes they do need some love

older cars are good,mercedes are better,older mercedes are the best
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