| 摘要 |
<p>The present invention relates to an apparatus for lifting and moving articles, comprising at least one arrangement (12) with a cavity (14), hereafter called vacuum chamber, which is connected to an arrangement (40) which is capable of producing negative pressure in said vacuum chamber, the underside of said lower plate (16) being provided with an elastic airtight bottom (18) and also being provided with a number of first through-passages (20) to said vaccuum chamber. The invention is characterized in that each first passage (20) is of cylindrical design with a diameter reduction in the part which is connected to the vacuum chamber, forming a shoulder (22) in the passage, in that the passage contains a body (30) arranged movably in said passage, in that said body, in planes which are at right angles to the centre line of the passage, has a greatest diameter which is only slightly smaller than the diameter of said first passage (20), and in that said first passage is provided with a second passage (24) with a considerably smaller diameter than the first passage (20), said body (30) being capable of essentially blocking said first passage (20) when a negative pressure is obtained in the vacuum chamber (14) with the exception of a given air flow in said second passage (24).</p> |
