Patent ID: 9388538
Filing Date: 2016-07-12
CPC Classification: B62D,E01C

Claim Text:
1. A construction machine, comprising: a machine frame having a front, a back, a left side and a right side, the machine frame being laterally extendible to adjust a width of the machine frame; at least one left side ground engaging unit steerably connected to the left side of the machine frame; at least one right side ground engaging unit steerably connected to the right side of the machine frame; each of the ground engaging units including a drive motor configured such that each ground engaging unit is driven across a ground surface by its respective drive motor; a frame lock configured to selectively lock and unlock the machine frame, such that when the frame lock is locked the machine frame cannot laterally extend, and when the frame lock is unlocked the machine frame can laterally extend; and a controller including a frame extension mode, the frame extension mode being configured to provide steering of at least one of the ground engaging units to provide a lateral force to adjust the width of the machine frame as the machine is driven across the ground surface by the ground engaging units.