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US 5,615,776 AGranted
Mounting & tensioning arrangements for screens
AssigneeAlfa-Laval Separation AB
InventorsOla Bjorklund, Alexander Ritchie, George Souter
Life of this patent
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AssigneeAlfa-Laval Separation AB
InventorsOla Bjorklund, Alexander Ritchie, George Souter
Estimating the term…
In a vibratory screening apparatus, a withdrawable lower fine mesh screen assembly (17) has a screen unit (19) releasably mounted on a grid/frame structure (20). The screen unit (19) has a sheet (21) of mesh material bonded to a grate or lattice (22) of a yieldable material such as a hard rubber, and this lattice (22) and the edges of the mesh (21) are also fixed to relatively rigid side members (23) which are mutually free each from the others. In the structure (20), a rigid grate of support bars (26) supports the lattice (22) with a sliding contact interface, and a frame (28) incorporates pneumatically actuated tensioners (30) and clamps (34A, 34B) respectively for tensioning/locking the screen unit (19) and coupling the screen assembly to the vibratory structure. The tension in the screen unit (19) is adjustable whilst on the structure (20) by virtue of the yieldability of the lattice (22) and its sliding contact interface with the support bars (26). Away from the screen assembly, the screen unit (19) is relaxed and less vulnerable to damage or deterioration of tensioning quality.
A screen assembly comprising a mesh material (21) under tension, a generally horizontally disposed apertured support means (22, 26) for distributed support of said mesh material (21), said mesh material (21) being superimposed on and in contact with said support means (22) and fixed to said support means at substantially all points of contact, said support means comprising a first grate (26) of relatively rigid construction and a superimposed second grate (22) of a material which is relatively yieldable at least in the generally horizontal direction, said mesh material (21) being fixed to said second grate (22) and the two grates (22, 26) being arranged in contact with one another.
A screen unit comprising a grate (22) and a mesh material (21) superimposed on and in contact with said grate (22), said grate (22) being adapted to be disposed in a generally horizontal plane for distributed support of said mesh material (21), said grate being made of a material which is yieldable at least in directions parallel to said plane, said mesh material being fixed to said grate at substantially all points of contact.
Dependencies are inferred from the claim text.