> I've never seen a mower set up like this. Seems a bit rube
> goldbergie.
We had one like that. The driving wheels were on a movable shaft, which
lifted them away from the main wheels to stop the drive. A crude but
effective clutch; better IMO than the more common (then) belt with a moving
idler pulley.
> You'll probably nee a different length of chain.
Which I think would be the advantage of just changing the driving wheel
diameter. The shaft moved in an arc, so it would just need to come a bit
higher to accommodate larger driving wheels, probably just a linkage
adjustment. The chain length doesn't need to change.
Probably the exposed drive system is too dangerous by today's standards, but
it was simple, effective and durable.
Randall
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