Flat Eric Posted May 7, 2006 Share Posted May 7, 2006 4 point harness What angle should the should the shoulder straps be, between chassis mounts and shoulder. Trying to mount seats lower in car, just want to make harnesses are still ok. Seem to remember that they should be either horizontal, or (and this is where I can't remember) the mounting points needs to be lower than shoulders(or should it be the other way round). Quote Link to comment Share on other sites More sharing options...
Liam Posted May 8, 2006 Share Posted May 8, 2006 (or should it be the other way round). Yes Quote Link to comment Share on other sites More sharing options...
BuGsBuNnY Posted May 8, 2006 Share Posted May 8, 2006 mounts higher ideally otherwise your spine will be compressed in case of an accident... Quote Link to comment Share on other sites More sharing options...
adhawkins Posted May 8, 2006 Share Posted May 8, 2006 Really? I don't think I've ever seen a Westfield where the harness mounts are higher than the driver's shoulders. Certainly neither of mine have been. Andy Quote Link to comment Share on other sites More sharing options...
BuGsBuNnY Posted May 8, 2006 Share Posted May 8, 2006 There is a difference between what should be and what is... Quote Link to comment Share on other sites More sharing options...
adhawkins Posted May 8, 2006 Share Posted May 8, 2006 I would have expected something like this to be part of SVA though? Andy Quote Link to comment Share on other sites More sharing options...
studbuckle Posted May 8, 2006 Share Posted May 8, 2006 SVA requirement it: minimum distance of 45cm between the bottom of the seat and the top of the seat belt mount. Where the distance is a vertical distance and the bottom of the seat is judged to be the lowest point of contact Quote Link to comment Share on other sites More sharing options...
adhawkins Posted May 8, 2006 Share Posted May 8, 2006 So as long as you're less than 45cm from shoulder to you're Ok... Andy Quote Link to comment Share on other sites More sharing options...
Mark Stanton Posted May 8, 2006 Share Posted May 8, 2006 mounts higher ideally Mounts higher than your shoulders How does that work with saloons and rally cars for example where fixings are taken down to floor level ? behind drivers and passengers Quote Link to comment Share on other sites More sharing options...
studbuckle Posted May 8, 2006 Share Posted May 8, 2006 Yes but by that criteria It would suggest that more is better and therefore higher is better as was suggested above. Of course you then get into the torsional strenghts of a vertical pole mounted on top of the chassis rail. The shorter this is the stronger it is. So pointing points directly on the chassis rail will be stronger but mounting points mounted on 20cm poles would be safer. therefore current arrangement is a compromise to a certain extent Quote Link to comment Share on other sites More sharing options...
studbuckle Posted May 8, 2006 Share Posted May 8, 2006 mounts higher ideally Mounts higher than your shoulders How does that work with saloons and rally cars for example where fixings are taken down to floor level ? behind drivers and passengers same compromise: fastened to cage or to floor is stronger than roof but risk of compression greater Quote Link to comment Share on other sites More sharing options...
nikpro Posted May 8, 2006 Share Posted May 8, 2006 This is not correct! The main purpose of a harness is to keep you in the seat in any form of accident. the best mounting point for the shoulder straps is below shoulder level because if the vehicle rolls it keeps you in the seat better and stops you slipping upwards. Quote Link to comment Share on other sites More sharing options...
studbuckle Posted May 8, 2006 Share Posted May 8, 2006 that point of view contradicts the view of the SVA test. I'm not saying I know the answer, just pointing out what can be summised from the regulations. Quote Link to comment Share on other sites More sharing options...
Westfieldman Posted May 8, 2006 Share Posted May 8, 2006 If you use EYE bolts in a loaded angle of 90 deg like in a Westfield you have to derate the eye bolt by 80% so a 1 tonne eye bolt will become unsafe at 200kgs The size used in a Westfield are approximatly [cos they have no SWL on them] 500Kgs so 100kgs is the limit in the 90 deg plane as used in a Westfield Working load limit for a 7/16" Shouldered eye bolt is 1800 lbs. 1 800 lb, lbs = 816.466 266 kilogram So 163.29kgs Quote Link to comment Share on other sites More sharing options...
studbuckle Posted May 8, 2006 Share Posted May 8, 2006 and presumably Paul that eyebolt into a post bolted onto a chasis rail would further derate the effectiveness? Quote Link to comment Share on other sites More sharing options...
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