Posted by Dave41A on May 08, 2021 at 10:07:22 from (71.161.67.127):
In Reply to: What is this? posted by J.Wondergem on May 05, 2021 at 14:57:37:
Quoting Removed, click Modern View to see
The picture I copied makes it seem like the larger gear is driven by a pitman arm. This is the off-center link that extends down and to the right from the pin in the big gear. I would guess this originally was connected to a foot treadle. The big wheel probably drove a belt.
Were there any dentists in the area? They used to use foot-powered drills with huge step-up in rpm to drill teeth.
Take a look at these guys for ideas. Similar mechanisms drove a variety of tools.
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