Lifting bag
Lifting bag is a device used in various industries, including rescue services, construction, and underwater diving, to lift heavy objects. They are typically made of high-strength fabric coated with rubber, and are inflated with air or water to provide lifting force.
History
The concept of the lifting bag has been around for centuries, with early versions being made from animal skins or leather and filled with air. The modern lifting bag was developed in the mid-20th century, with the advent of synthetic materials that could withstand the pressures involved.
Design and operation
A lifting bag is designed to be placed under an object, then inflated to lift the object off the ground. The bag is typically connected to a compressor or other source of pressurized air or water, which is used to inflate the bag. The pressure inside the bag creates a lifting force, which can be controlled by adjusting the pressure.
Lifting bags come in various sizes and shapes, depending on the application. Some are designed to lift heavy objects straight up, while others are designed to tilt or roll objects. Some lifting bags are designed to be used underwater, for applications such as salvage operations or underwater construction.
Applications
Lifting bags are used in a wide range of applications. In the rescue services, they are used to lift heavy objects to free trapped victims. In construction, they are used to lift and move heavy materials. In underwater diving, they are used to lift sunken objects to the surface.
Safety
Safety is a critical aspect of lifting bag operation. The bags must be properly positioned and inflated to avoid uncontrolled movement of the object being lifted. Operators must also be aware of the risk of the bag bursting or deflating unexpectedly, which can cause the object to fall.
See also
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