Vacuum filterbelt apparatus

Claim 2

In a vacuum filterbelt apparatus comprising a continuous belt, driving means for moving said belt along a continuous path which includes an operative path portion at which the upper face of the belt is concave and apertures extend therethrough, at least one vacuum chamber extending beneath the belt in frictional contact with said belt and in communication with said apertures, whereby suction filtering of material on the belt is effected and independent stationary support members for said belt positioned beneath the belt and spaced from said vacuum chamber surface, said support members defining passages therethrough opening at their upper surfaces for supply of lubricating agent beneath the moving belt, the improvement that the upper surfaces of the support members have grooves running in the longitudinal direction of said belt for the entire length of the supports, the said passages opening into said grooves.

Claim 3

Apparatus according to claim 1 wherein the upper surfaces of the support members are formed of a low-friction synthetic material.

Claim 4

Apparatus according to claim 1 wherein as seen in section transverse to said longitudinal direction, said grooves have a smoothly curved wave-shape.

Claim 5

Apparatus according to claim 3 wherein said wave-shape has a pitch in the range of 5 to 15 mm.

Claim 6

Apparatus according to one of claims 1, 2 or 3 wherein the upper surfaces of said support members are provided by blocks of uniform shape having side dimensions in the range of 40 to 60 cm.

Claim 7

Vacuum filterbelt apparatus comprising a continuous belt of resilient material having, on one side, a concave face, belt guide means and drive means for moving said belt in a continuous path which path includes an operative path portion at which said belt has its said concave face upwards, independent stationary support plates located beneath said belt at said operative path portion, and each having an upper surface which has grooves extending over its entire length in the longitudinal direction of said belt and having passages opening into said grooves for supply of lubricating agent to said upper surface to reduce frictional drag between said upper surface and the belt, at least one vacuum chamber in frictional contact with said belt located beneath said operative path portion between said support plates and spaced therefrom, said vacuum chamber having at least one aperture at its upper side, the belt having apertures through it which, at said operative path portion, register with said aperture of the vacuum chamber so that suction is applied through the apertures in the belt to material on said upper concave face of the belt.

Claim 8

Vacuum filterbelt apparatus comprising a continuous belt of resilient material having, on one side, a concave face, belt guide means and drive means for moving said belt in a continuous path which path includes an operative path portion at which said belt has its said concave face upwards, independent stationary support plates located beneath said belt at said operative path portion, and each having an upper surface which has grooves extending over its entire length in the longitudinal direction of said belt and having passages opening into said grooves for supply of lubricating agent to said upper surface to reduce frictional drag between said upper surface and the belt, at least one vacuum chamber in frictional contact with said belt located beneath said operative path portion between said support plates and spaced therefrom, said vacuum chamber having at least one aperture at its upper side, the belt having apertures through it which, at said operative path portion, register with said aperture of the vacuum chamber so that suction is applied through the apertures in the belt to material on said upper concave face of the belt.