Screen
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United States of America Patent
Stats
-
Jun 24, 1980
Grant Date -
N/A
app pub date -
Sep 28, 1978
filing date -
Oct 3, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A screening apparatus has a screening surface comprising at least one group of elongate, mutually parallel and mutually adjacent screening elements, the size of the mesh defined by adjacent elements being varied by moving the elements of one and the same group transversally of their longitudinal axes while maintaining an equal distance between all said elements. Each screening element of a particular group of said elements is mounted on an associated arm arrangement which can be swung about an axis extending parallel to the long axis of an associated screening element. Planes containing the pivot axis of a respective arm arrangement and the longitudinal axis of its associated screening element are parallel to one another while the distance between said axes decreases from arm arrangement to arm arrangement in direct proportion to the distance between the pivot axes of the arm arrangements. One advantage afforded hereby is that the force required to shift the screening elements, to change the mesh size, is smaller than with known apparatus.
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