Spiral link belt with low permeability to air and method for its production
AssigneeSiteg Siebtechnik GmbH
InventorJohannes Lefferts
Life of this patent
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Abstract
A spiral link belt has a plurality of plastic helices connected to one another which interlock in the manner of a slide fastener with neighboring helices. Overlapping widening arcs form a channel and pintle wires run through the channels and thereby connect the helices. Flat wires are inserted in the helices to reduce the air permeability of the spiral link belt. The flat wires are tilted relative to the plane of the spiral link belt. The flat wire running inside a helix can be wider than the smallest distance between the two helices connected to this helix. During production, the spiral link belt is thermoset only after the insertion of the flat wires.
Claims10
A spiral link belt comprising a plurality of plastic helices interconnected in a common plane, each plastic helix having flat winding limbs and interconnecting winding arcs with the winding arcs of a helix disposed in intermeshing engagement with winding arcs of a preceding helix and a following helix to define channels, so that a distance is defined between the winding arcs of the preceding and the following helices, the winding limbs of one helix and the winding arcs of said preceding and following helices defining a free space within said one helix, a pintle wire disposed in each channel to connect the helices and a flat wire extending through said free space within each helix to reduce the air permeability of the spiral link belt wherein the flat wires are tilted relative to the plane of the spiral link belt.
A method for the production of a spiral link belt comprised of a plurality of plastic helices comprising meshing the helices into one another to form a plurality of channels, inserting a pintle wire into each channel, inserting a flat wire into each helix, thermosetting the spiral link belt only after insertion of the flat wires.
Dependencies are inferred from the claim text.