Why tow spurs and two pinions are provided in double purchase crab machine?

In a double purchase crab machine, two spurs and two pinions are provided to enhance load distribution and improve mechanical efficiency. This dual setup allows for greater lifting capacity and smoother operation, as the load is shared between the two pinions, reducing wear and tear. Additionally, having two spurs helps minimize the risk of failure by providing redundancy, ensuring that even if one component fails, the system can still operate effectively. Overall, this design contributes to increased reliability and performance in lifting applications.