Two frame elastic screening appartaus having substantially linear relative movement
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United States of America Patent
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Sep 24, 1991
Grant Date -
N/A
app pub date -
Sep 5, 1989
filing date -
Sep 5, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention concerns a screening apparatus comprising two frame systems which are movable relative to one another, comprising grate bars assigned to each system, which grate bars of each frame system are alternately disposed and are connected by means of flexible screen elements which are fastened at the latter, bridge the distance between the bars, and are tensioned and relieved of tension by means of the relative movement of the two systems caused by means of an eccentric shaft which is supported exclusively at the two systems and rotated by means of a drive. This known construction is improved, according to the invention, in that the eccentric shaft is arranged at one end of the two systems (1, 7) and the latter are connected with one another at a distance from this end by means of an element (12) which ensures a substantially linear relative movement of the two systems relative to one another. The aforementioned distance preferably corresponds to the distance of the acceleration pole (P.sub.B) of the oscillating system (1, 7) from the eccentric shaft (3).
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