Screw lift
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 23, 1994
Grant Date -
N/A
app pub date -
Dec 8, 1992
filing date -
Dec 21, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a screw lift the lift cage is carried by a drive nut rotatably provided on an essentially upright screw, the lift cage carrying a bearing means and a drive means for the nut. The screw is supported by several supporting braces attached thereto along the length thereof. The nut has the shape of a spiral having turns, the pitch and axial thickness of which are adapted to the distance between the braces and the dimensions of these in the length direction of the screw so as to enable the nut to pass freely past the braces by passing between the turns of the nut during the passage.
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