The stage hand - operated chain hoist is a manual lifting device specifically applied in the stage field. The following is an introduction to it: Structural Composition - Chain: Usually made of high - strength alloy steel, it features high strength and wear resistance. It can bear the tension of heavy objects, ensuring the safety and reliability of the lifting process. The chain is a key component for power transmission and load - bearing. - Sprocket: Working in tandem with the chain, it is generally processed from high - quality metal materials. Its surface undergoes special treatment to reduce friction and wear, ensuring smooth transmission of the chain on the sprocket and enabling the smooth lifting and lowering of heavy objects. - Braking Device: It is a crucial component for ensuring safety. Generally, methods such as pawl - ratchet braking or friction - disc braking are employed. During the process of pulling the chain to lift or lower heavy objects, when the operator stops pulling, the braking device takes effect immediately to prevent the chain from reversing, keeping the heavy object in a fixed position and avoiding the risk of falling. - Hook: Used to hang and lift heavy objects like stage equipment and props, it is usually manufactured through forging, boasting good toughness and strength. The shape and size of the hook are designed according to different usage requirements to ensure that it can firmly hang various items. - Hand - pulled Chain: Manually pulled by the operator, the lifting speed and height of the heavy object are controlled by the length and frequency of pulling the chain. The hand - pulled chain generally has a good hand - feel and anti - slip properties, facilitating the operator to exert force and control. - Gear Transmission System: Composed of multiple gears, through the combination of gears of different sizes, it realizes the transmission and amplification of force, enabling the operator to pull the chain with relatively little force to lift heavier objects. The gear transmission system usually adopts high - precision gears to guarantee the smoothness and accuracy of transmission. Working Principle The stage hand - operated chain hoist mainly operates based on the principles of gear transmission and leverage. When the operator pulls the chain, the chain drives the sprocket to rotate. The sprocket transmits power to the drum through the gear transmission system. The chain wound around the drum is wound and unwound as the drum rotates, thus achieving the lifting and lowering of the hook and fulfilling the purpose of hoisting and moving heavy objects such as stage equipment and props. In this process, the gear transmission system plays a role in reducing speed and increasing force, allowing the operator to lift heavier objects with less effort. Characteristics - Simple to Operate: It doesn't require complex electrical equipment or professional skills. Simply pulling the chain manually can achieve the lifting and lowering of heavy objects. Even those without professional experience can quickly get started and operate it. - Compact Structure: It is small in size, light in weight, takes up little space, and is easy to install and remove. It can adapt to various stage environments with different space conditions. - Low Cost: Compared with equipment such as stage electric hoists, the stage hand - operated chain hoist doesn't need an electric drive system and a complex control system. Its manufacturing cost and procurement cost are relatively low. For some stage performances and events with limited budgets, it is an affordable option. - Safe and Reliable: Although the structure is relatively simple, it is equipped with reliable braking devices and safety protection measures. Under normal usage conditions, it can ensure the stable suspension of heavy objects and the safety of operation. Application Scenarios

The stage hand - operated chain hoist is widely used in various stage scenarios, such as small - scale cultural and artistic performances, community activities, school auditorium performances, etc. It can be used to hoist small musical instruments, simple lighting equipment, small props, background curtains, etc. On some traditional Chinese opera stages, small - scale drama stages, and temporarily - built stages, the stage hand - operated chain hoist can also play an important role in meeting the basic hoisting needs of stage equipment and props.