Patent ID: 6945342

Claim:
A track drive undercarriage device attached to a chassis of a heavy construction vehicle and operationally connected to a transmission and drive shaft of the construction vehicle, said device comprising: a pair of support braces attached to the construction vehicle; a base plate attached to said support braces; four shock absorbers attached to said base plate; four axles attached to said four shock absorbers, each axle having a distal end and a proximate end, the proximate end of each axle is attached to one of said four shock absorbers; a pair of torque bars attached to said four axles, each torque bar having two opposite ends, each opposite end of each torque bar is attached to the distal end of one of said four axles; and four spindles attached to said four axles, each spindle is attached to the distal end of one of said four axles; wherein each shock absorber comprising: a U-brace attached to said base plate; a horizontal cross bar attached to said U-brace; a pair of horizontal springs attached to said U-brace and attached to said horizontal cross bar; and a vertical spring attached to said U-brace and attached to said horizontal cross bar, wherein the proximate end of each axle is attached to said horizontal cross bar, said pair of horizontal springs and said vertical spring of one of said four shock absorbers.