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:

Anonymous said...

'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

Mister G said...

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...

JP said...

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

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

Anonymous said...

That's material for the Nobel Prize in Complexity.

Mister G said...

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

Joe said...

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).

Anonymous said...

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

Mister G said...

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