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Home Forums General Ergonomics Topics Ergonomic limits for thumb and 1st finger

This topic contains 1 reply, has 1 voice, and was last updated by  ship69 3 years, 8 months ago.

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  • #48841

    ship69
    Participant

    Hello

    I am new here.

    I am designing product that is similar to a clothespin /cloths-peg. i.e. It involves some jaws that need to be opened by a user with one hand.

    I need to know:
    a) What is the maximum ergonomic span between thumb and 1st (or 2nd) fingers?
    b) What is the maximum acceptable for between thumb and 1st (or 2nd) fingers?

    For use by male and female adults aged at least late teens on wards.

    Many thanks

    J

    • This topic was modified 3 years, 9 months ago by  admin.
    • This topic was modified 3 years, 9 months ago by  ship69.
    #48844

    ship69
    Participant

    Getting there…
    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?

    Many thanks

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