two speed jack shaft

[oldfatguy]

Patent US3610062 - AUTOMATIC MINI-BIKE TRANSMISSION - Google Patents

these are the patent drawings for the two speed jack shaft, it's interesting reading if you ever wonderd how they work

 

[Andrewp]

Very cool. Nice job digging that up. That matches my sears two speed pretty close except for the brake placement.:thumbsup:

 

[oldfatguy]

Patent US3747721 - MINI BIKE DRIVE KIT - Google Patents

here is one for a torque converter