What are the categories and types of elevators?

　　Elevators come in a variety of types and forms, which can primarily be classified according to their structural characteristics, drive mechanisms, and intended uses.

　　Classified by structural characteristics

　　This is the most basic classification method, primarily distinguishing the core motion modes of elevators:

　　Elevator: A permanent transportation device that serves several specific floors within a building, with its car running along at least two rigid guide rails that are either vertical to the horizontal plane or inclined at an angle of less than 15° relative to the vertical. This is what people commonly refer to as a vertical lift elevator.

　　Escalator: A fixed, power-driven device equipped with continuously circulating steps (treads) used to convey passengers upward or downward at an incline.

　　Passenger Conveyor: A fixed, power-driven device equipped with a circulating belt or step-type walkway, used to transport passengers horizontally or at an incline angle not exceeding 12°.

　　Classified by drive method

　　The drive method determines the elevator's power source and operating principle:

　　Traction-driven elevators: These elevators rely on the friction between the traction machine and steel cables to drive the elevator car. They are currently the most common type of elevator and are suitable for buildings of all heights.

　　Forced-drive elevators: Use chains or steel cables to drive the elevator car upward and downward in a non-friction manner, such as by means of drum winding.

　　Hydraulic elevators: Driven by a hydraulic system, they lift the car via the linear motion of cylinders and pistons. They are typically used in low-rise buildings, offering smooth operation but relatively slow speeds.

　　Categorized by purpose

　　The classification by use reflects the elevator's design objectives and target users:

　　Passenger elevator: Specifically designed for transporting passengers.

　　Freight elevators: Primarily designed for transporting goods, with the option to allow personnel to accompany them.

　　Passenger and freight elevator: Primarily designed for transporting passengers, while also capable of handling non-concentrated loads of goods.

　　Patient bed elevators (medical elevators): Specifically designed for transporting patient beds, patients, and related medical equipment, these elevators have special requirements for cabin dimensions and interior design.

　　Residential elevators: Designed for use in residential buildings and accessible to the public, they typically have specific requirements regarding space and noise levels.

　　Goods lift: A fixed lifting device serving designated floor stations, primarily used for transporting small items of cargo; it is not intended for passenger use.

　　Sightseeing elevators: The carriages are typically equipped with transparent walls, allowing passengers to enjoy the outside scenery during the ascent and descent.

　　Car elevators: Specifically designed for transporting vehicles, these elevators feature cabin dimensions and load capacities that far exceed those of standard elevators.

　　Firefighter elevator: A specialized elevator used by firefighters in the event of a building fire, equipped with special safety features such as fire resistance, smoke prevention, and emergency power supply.