In this paper, a new designed and manufactured tracked mobile robot is illustrated. This robot may be used as a mean of transportation for disabled people and load carrying machine due to a safe and smooth motion on the stairs. The present robot’s mechanism is based on combination of stair climber wheeled and tracked robot, and benefits the advantages of both mechanisms. The new mechanism’s structure, increases the contact area of robot with the stair surfaces, hence decreases the probability of slip on the stairs. The robot can ascend the stairs properly as a result of higher safety on the stairs. The present paper focuses on several design aspects such as main idea, stair climbing style, stability, safety and smooth motion considerations.

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