Which tool is designed in three basic types to lift or displace objects?

Pneumatic lifting bags are specifically designed for lifting or displacing heavy objects, and they operate using compressed air to inflate and create lift. These bags come in three basic types: straight bags, wedge bags, and corner bags, each tailored for various lifting scenarios. Straight bags are used for flat surfaces, wedge bags can fit into tight spaces, and corner bags are designed for lifting objects from corners. This versatility makes pneumatic lifting bags highly effective in rescue operations and scenarios involving heavy debris, allowing rescuers to safely and efficiently lift loads that would otherwise be difficult to move. The design and operation principle of pneumatic lifting bags enable them to handle a wide range of lifting situations, which is essential in emergency and firefighting contexts.

Other tools listed, such as chain hoists, lever blocks, and drill jacks, serve distinct lifting purposes and mechanisms but do not encompass the same range of specialized lifting capabilities that pneumatic lifting bags provide. Each of those tools has specific applications, like hoisting loads in a vertical direction or acting as supports, but they do not have the same multi-functional design that caters to various lifting needs as well as pneumatic bags do.