Thursday, October 30, 2025

Know your twistgrips...


 From top, Amal screw-pull, second- same with air lever, drum type and a rack and pinion design. And yes, this will be on the test...
Below, Honda 90, BMW  
                                              



                             

                            Twistgrip Patent US765138



8 comments:

  1. 'Course, BMW twins used to feature a throttle that used a ramp and a rack/pinion and a nice little chain. Here's a drawing on that there eBay:

    https://www.ebay.com/itm/225944402439

    --rats

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  2. And the early Honda one that had a track machined in the handlebar and spiral in the grip.. Lots of great ideas over the years.... I'll keep adding them as I find them...

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    1. I used to have CD175s as my default bike (the 1970s ones); they also had the in-handlebar groove and slide thingy. D.

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  3. How about a gimbal (or CV ?) twistgrip...

    https://commons.wikimedia.org/wiki/File:Twistgrip_Patent_US765138.png

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    1. That is the best illustration for the need for the Bowden cable. All added to the post....

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  4. That's material for the Nobel Prize in Complexity.

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  5. I see the inventor on that twist grip patent is 'Carl O. Hedstrom" and thought to myself "That sounds familiar". Then it hit me - the 'O' stands for 'Oscar' Hedstrom of Indian Motocycles (no R in Motocycles).

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    Replies
    1. They made sure you had to buy a factory handlebar. Or we just rode with bent bars :-)

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