With a little help from the Chartered Institute of Ergonomics, I have finally discovered that for pinching between first and index finger (which is what will be required by our new product):
1). 95% of women should be able to pinch with 62+ Newtons
2). 95% of women should be able to grasp to a width of 94+mm
What I now need to know is how much to scale back to allow for:
A) Being at near maximum width of stretch (say 94mm) ==> reduce force by 25%?
B) For say 25 repeat pinches within 5 minutes ==> reduce force by a further 30%?
C) Reasonable comfort (as opposed to maximums) ==> ?
Are there any broad ergonomic principles or rules of thumb (!) that I might apply?
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