| 摘要 |
The invention relates to an elevator featuring a special propelling fluid dynamic device which uses as a plunger the duly balanced car counterweight. The elevator is of the type comprising a car for conveying people or things which moves upwards and downwards within a vertical conduit called hoistway, which is supported by a cable extending to an upper pulley and, changing the direction, extends to a counterweight balanced with said car; one of the main characteristics of the assembly is that said pulley is supported from the hoistway walls and is kept in a freely-rotating condition, while the balanced counterweight is a hollow piston-counterweight, accommodated in a cylinder vertically disposed in the hoistway itself, adjacent to the car, both being integral with a propelling fluid dynamic device which produces upward and downward movements of the car, which is completed with a circuit comprising a fluid flow conduit, and a driving pump coupled to valve means. The propelling device may be pneumatic or hydraulic.
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