Support devices including movable leg segments and methods for operating the same

A support device comprising:

• a wheel;
• a base member;
• a leg coupled to the wheel and the base member, the leg comprising:
• an upper leg segment;
• a lower leg segment positioned below the upper leg segment;
• a joint positioned between the upper leg segment and the lower leg segment;
• and an actuator engaged with the upper leg segment and the lower leg segment, wherein the actuator comprises:
• a linear engagement member that is engaged with one of the upper leg segment and the lower leg segment;
• a cammed member defining a non-circular perimeter engaged with the linear engagement member;
• and
• a motor engaged with the linear engagement member through the cammed member, wherein the motor moves the linear engagement member moving the upper leg segment and the lower leg segment between an extended position, and a retracted position in which the upper leg segment and the lower leg segment are closer to one another as compared to the extended position, and wherein the linear engagement member applies a first force to the one of the upper leg segment and the lower leg segment in the retracted position and applies a second force to the one of the upper leg segment and the lower leg segment in the extended position, wherein the first force is greater than the second force.