harness upper mounting points??

[stuart.collins]

Originally Posted by skov

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

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.