In a spur-gear chain hoist with a two-chain system, what is the purpose of the endless chain?

In a spur-gear chain hoist with a two-chain system, the endless chain plays a crucial role in the lifting mechanism. Its primary function is to raise and lower the load effectively. The endless chain moves through the hoist's sprockets, which are driven by the spur gears. As the operator pulls on the chain, the sprockets rotate, which subsequently elevates the load attached to the hoist. This motion is a fundamental aspect of how these hoists achieve mechanical advantage and control over the lifting process.

The other options do not accurately describe the function of the endless chain in this context. While the hoist may securely attach to an anchorage point or a load, it is not the endless chain that performs these tasks directly. Similarly, wrapping around a bulky load is not a primary function of the endless chain, as its design and purpose are focused on the motion of raising and lowering the load itself.