Patent ID: 6056500
Filing Date: 2000-05-02
Classification: B66C,B66F,F15B

Abstract:
In a vacuum hoisting device for lifting in a lift cycle an object having a weight, the vacuum hoisting device comprising:(a) a vertical lifting tube suspended at an upper part, the vertical lifting tube being axially extensible and contractible depending upon air pressure in the vertical lifting tube;(b) a vacuum source connected to the vertical lifting tube and having a suction capacity;(c) at least one suction cup at a lower part of the vertical lifting tube; and(d) a regulating device upstream of the vacuum source and operated by an energy input regulator to manually adjust energy input to the vacuum source during the lift cycle to control the suction capacity of the vacuum source depending on a desired air pressure in the vertical lifting tube, the desired air pressure being a function of the weight of the object being lifted.