The internal structure of a hand chain hoist may vary slightly depending on the manufacturer and the specific model, but generally, hand chain hoists share some common components. Here's a basic overview of the internal structure of a typical hand chain hoist:

Load Chain: The load chain is a crucial part of the hoist, consisting of interlinked load-bearing links. This chain is responsible for supporting and lifting the load. It is typically made of alloy steel for strength and durability.

Hand Chain: The hand chain is the manual operating component that users manipulate to lift or lower the load. Pulling the hand chain activates the lifting mechanism, causing the load chain to move.

Ratchet and Pawl Mechanism: The ratchet and pawl mechanism is responsible for controlling the movement of the load chain. When the hand chain is pulled, the ratchet engages the pawl, allowing the load to be lifted. The pawl prevents the load from lowering unintentionally.

Gearing System: The hoist includes a gearing system that multiplies the force applied to the hand chain, making it easier for the operator to lift heavy loads. This gearing system is often enclosed within the hoist body for protection.

Load Hook: The load hook is attached to the load chain and is the point where the load is connected. It usually has a safety latch to prevent accidental detachment of the load.

Bottom Block: The bottom block houses the load chain and is connected to the hoist body. It contains the sheaves or pulleys over which the load chain runs, guiding it in a controlled manner.

Brake System: Hand chain hoists are equipped with a braking system to ensure that the load remains in the desired position when the hand chain is released. This prevents the load from free-falling.

Hoist Body or Housing: The hoist body encases and protects the internal components. It is often made of sturdy materials such as steel or aluminum. The design of the body may include features for easy attachment to support structures or mounting points.

Lifting Link or Suspension Lug: The lifting link or suspension lug is a part of the hoist that connects it to the supporting structure or a trolley. It provides a secure point for suspending the hoist during lifting operations.

It's important to note that while hand chain hoists are manually operated, some may incorporate additional features for user safety and ease of use. Always refer to the manufacturer's instructions and guidelines for the specific hand chain hoist model you are using.