Patents Assigned to AB Initio Affars- & Teknikutveckling
  • Patent number: 6056500
    Abstract: The invention relates to a vacuum hoisting device of the kind having a vertically suspended lifting tube (4), which is extensible and contractible depending upon the air pressure in the lifting tube, and which at its lowest part is provided with a suction device (6) in the shape of one or more suction cups. Up to now, a valve at the suction device has been used for maneuvering the suction device, which valve when closed brings a vacuum source (7,20) to work with a constant suction capacity to decrease the pressure in the lifting tube such that an object (32) to be lifted is attached by the suction after which the lifting tube is contracted such that the object is lifted. To limit the lifting height and to lower and release the object, it has been necessary to partially open the valve and permit a restricted inlet of air and at last completely open the valve resulting in a large consumption of air.
    Type: Grant
    Filed: September 25, 1998
    Date of Patent: May 2, 2000
    Assignee: AB Initio Affars- & Teknikutveckling
    Inventor: Jan Wicen