Need help with structure of stair climbing robot

[Umair Mazhar]

Im supposed 2 design a robo like this 1, but here, the mechanical part seems more tought thn the electrical and programming. I couldn’t make out what mechanical structure is being used to have this type of motion. Can anyone please help.



Here’s a start:
There r 2 motors attached in the centre part of the robot, which keeps sliding back anf forth.
But, I can’t figure out out is the motor shaft being coupled to the structure, and how does it have tht kinda motion.

 

[Allenman]

The sliding motion looks to be from a belt or chain. Utilizing a stepper motor with a chain or belt would allow you to count how many steps it takes to move a fixed point on the chain from one end of the track to the other. The fixed point on the chain or belt is attached to a pivoting mechanism (probably another stepper motor) within the body of the robot... inside the track that it slides on is probably a wire ribbon similar to that of the inside of a printer which would power the motors for the wheels. That's just me dissecting it with my eyes though.

OR... if you don't want to use a chain or belt, you can make a rack and pinion design to create the sliding motion.

 

[Umair Mazhar]

thnx

 

[Umair Mazhar]

i can't see any motors attached to da wheels, r thr motors?