Running control structure for a lawn tractor

A running control structure for a lawn tractor switchable between a two-wheel drive mode and a four-wheel drive mode, comprising:

• first wheel means;
• dirigible second wheel means;
• first drive means for driving said first wheel means;
• second drive means for driving said second wheel means;
• drive switching means for switching said second drive means between a driving state and a non-driving state, said drive switching means including control means for controlling said drive switching means;
• biasing means for biasing said control means to a position corresponding to said non-driving state of said second drive means;
• and
• a control pedal,
• wherein said first wheel means includes front wheels, and said second wheel means includes rear wheels,
• wherein said drive switching means includes a lock mechanism for maintaining said rear wheels in a driven state, said drive switching means includes an unlocking mechanism for undoing said lock mechanism, said unlocking mechanism includes a foot-operated unlocking pedal, and said control pedal and said unlocking pedal have tread surfaces disposed adjacent each other, so that said control pedal and said unlocking pedal are depressible together to maintain said rear wheels in said driven state while maintaining said lock mechanism in an inopertive position.

A running control structure for a lawn tractor switchable between a two-wheel drive mode and a four-wheel drive mode, comprising:

• first wheel means;
• dirigible second wheel means;
• first drive means for driving said first wheel means;
• second drive means for driving said second wheel means;
• drive switching means for switching said second drive means between a driving state and a non-driving state, said drive switching means including control means for controlling said drive switching means;
• biasing means for biasing said control means to a position corresponding to said non-driving state of said second drive means;
• and
• a control pedal,
• wherein said first wheel means includes front wheels, said second wheel means includes rear wheels, said drive switching means includes a lock mechanism for maintaining said rear wheels in a driven state, said lock mechanism includes a foot-operated lock pedal, and said lock mechanism is automatically operable when said control pedal and said lock pedal are depressed a first predetermined amount.