A lifting machine is a device that lifts heavy loads by applying a smaller force. They are used in industries to move heavy components and machines, and to load and unload cargo. 

How they work 

• A lifting machine applies force at one point and lifts the load at another point.
• The load and force move different distances.
• The machine's mechanical advantage (M.A.) is the ratio of the load lifted to the force applied.

Examples of lifting machines 

• Pulleys: Used to lift water from wells
• Screw jacks: Used to lift buses
• Wheel and axle: A simple machine used in lifting
• Inclined plane: A simple machine used in lifting
• Wedge: A simple machine used in lifting
• Lever: A simple machine used in lifting

Safety 

• The Occupational Safety and Health Administration (OSHA) sets regulations for lifting equipment.
• Contractors must follow manufacturer procedures and ensure users are professionally trained.
• Equipment must be inspected regularly.