harness upper mounting points??

[stuart.collins]

Hello, ive been working out what do with the upper harness mounting points. I'm unsure where to get them mounted? Either on a harness bar on the cage or on sb2??

Could i ask what you guys have done?

Many thanks, stuart.

[baz-r]

most like i have mounted to the roll over bar cross brace but if you can get them on the seat back it easyer in the iva aspect if you can get the correct hight from your seat bum area (iva spec) and will be diffrent on every car you would want to reinforce the seatback top tube wit an extra bit of box like some other locost based chassis

[rapidtornado]

Just about to do mine I'm mounting them on the cross brace of my rollbar

Make sure yours seats are fitted first so you can mount them in the right location

Rapid

[stuart.collins]

Are you going to have a diagonal bar also?? I was wondering if it would be a bit close on the harness bar where all 3 meet. also im using seat pads fixed to the rear bulkhead and a loose one on the floor.

When i spoke to phil (talon) he said if the harness go around the seat and not through it, it makes the iva easier.

Stuart

[Luke2842]

The harness holes in my seats were quite low once they were mounted so have put the brackets in the upper seatback rail

[alga]

Will this be OK for IVA though? I seem to remember that the upper harness mount points must not be lower than the driver's shoulders.

[stuart.collins]

Rubbish, i'll phone phil in the morning (as he is making it as a part of my package from him) if they have to be below shoulder thats going to be a problem... as my seat pad on the flor is only 3" thick so i'm sitting in the car instead of on it if you see what i mean?!?

Edit...

I must read replys better..... if they have to higher thats fine then.

[skov]

This is the minimum height for the upper seat harness mounts, taken from the IVA manual:

https://lh3.googleusercontent.com/-aAhSLNvvmPc/T0AMLJTaLZI/AAAAAAAAIMk/2eP1_nwQCpQ/s598/seat_belt_height.jpg

[skov]

Oh, and you also need a head rest / restraint:

https://lh5.googleusercontent.com/-apLXqxFN-C4/T0AN6z3NB6I/AAAAAAAAIMs/S1p2QlAphxM/s551/head_rest.JPG

[Luke2842]

The optimum angle of the straps is 0 to 10 degrees below the line of the drivers shoulders.

[stuart.collins]

Oh, and you also need a head rest / restraint:

https://lh5.googleusercontent.com/-apLXqxFN-C4/T0AN6z3NB6I/AAAAAAAAIMs/S1p2QlAphxM/s551/head_rest.JPG

What about if the seat has a inbuilt headrest?? Or do they have to be seperate??

[skov]

Yeah, it needs a head rest. Inbuilt into the seat is fine, or in your case where the chassis is effectively the seat, it can be attached to the rollbar (see point 10 below)

Here's the requirements relating to head rests:

6. A system of head restraint must be fitted on every outboard front seat.

7. For outboard front seats the height of the top of the head restraint above the R point must be at least 700mm.

9. The head restraint must be at least 85 mm wide each side
of the vertical centre line of the seat and at least 100mm high.

10. The head restraint must be securely attached to the seat. (Where the seat is either part of the structure or is fixed to the structure with no adjustment then the head restraint may be attached to the vehicle structure or roll bars)

11. The head restraint must be appropriately positioned and of adequate strength to fulfil its function. (The function of a head restraint is to limit the rearward displacement of an adult occupant’s head in relation to their torso in order to reduce the danger of injury to the cervical vertebrae of that occupant in the event of an accident)

12. There must be a gap of no more than 25mm between the top of the seat the bottom of the head restraint in its lowest in-use position for adjustable head restraints and 50mm for fixed type head restraints.

13. The head restraint must not have any roughness or sharp edges likely increase the risk of injury to the occupants.

14. The surface of the head restraint contactable with a 165mm sphere travelling horizontally in a rearward direction must either be rigid and have a radius of curvature of no less than 5 mm or be covered with padding to the extent that a degree of protection


I think your 'loose' pad on the floor will need to be secured so it can't move around during use too.
These two points probably apply:

1. Every seat must be securely attached to the vehicle structure, or other obvious suitable load bearing parts of the vehicle (see notes 1, 2, and 3).

Note 2: In respect of a seat that comprises of a “lift-out”
backrest and/or squab (cushion) it will be considered secure providing,
when in the operational position, it is located such that there
is no possibility of accidental lateral or longitudinal movement within the
vehicle whether it is in use or not.


It's well worth digesting the IVA manual, particularly if you're doing things a little out of the ordinary!

[stuart.collins]

Well thats good news, because my mate has got a caterham with seatpads and his headrests is on the roll bar/diagonal...

Many thanks for all the information chaps.:)