Gear shifting means

A tubular shaft,

• a cylindrical shaft within and concentric with said tubular shaft,
• means for maintaining said shafts in fixed relation when said tubular shaft is rotated in one direction,
• means actuated by limited rotation of said tubular shaft in the opposite direction to cause said cylindrical shaft to rotate through a predetermined angle with respect to said tubular shaft,
• said actuating means comprising a cam connected to said tubular shaft, teeth on said cylindrical shaft and a movable member controlled by said cam for engaging and turning said teeth through said predetermined angle when said tubular shaft is rotated in said opposite direction.

Gear shifting means comprising

• a drive shaft mounted for rotation in a supporting frame,
• a shift shaft within said drive shaft,
• means for rotating said drive shaft in one direction,
• means for reversing the direction of rotation of said drive shaft,
• means for limiting said reverse rotation of said drive shaft to not more than about one revolution,
• a plurality of gears mounted on said shaft in fixed axial position but normally unconnected rotationally to said shaft,
• means including said shift shaft for successively and in predetermined sequence connecting each said gear to said drive shaft in driving relation while simultaneously disconnecting a previously connected gear, and
• means actuated by said limited reverse rotation of said drive shaft to cause predetermined angular rotation of said shift shaft in said reverse direction beyond the limited angular rotation of said drive shaft whereby said connecting and disconnecting means are operated.