Patent ID: 7607527

Claim:
A wheel conveyor comprising a frame material having a substantially groove-like sectional shape which includes an opening in an upper surface portion thereof and a wheel assembly inserted and installed in a groove of said frame material, said wheel conveyor being constructed of a plurality of wheels that are rotatably supported by said wheel assembly and have outer circumferential surfaces protruding a little above an opening surface, wherein: a wheel has an axle pin caused to pierce a central portion of a boss thereof to project from both ends, pin holes into which projecting ends of said axle pin are inserted are formed in support plates arranged on both sides of said wheel, and said wheel assembly is constructed by inserting said projecting ends of said axle pin into said pin holes of said support plates to be rotatably supported; wherein: a cross-sectional shape of said frame material is formed such that a first groove-like portion facing inward, which is formed integrally with an inward lip portion forming an opening of an upper surface portion, has substantially the same shape and size as a cross-sectional shape of said support plate and supports said support plate to be movable in a longitudinal direction, an inward bottom groove-like portion formed integrally with a bottom wall is formed to splay more than an edge of said lip portion, and inner ends of said two groove-like portions are integrally jointed to each other through a joint portion, and the cross-sectional shape of said support plate as a whole is formed in a substantially groove-like shape which includes an opening in an upper surface portion and formed into a uniform cross section in a longitudinal direction; and wherein: said support plates of a plurality of said wheel assemblies are inserted along a first groove-like portions of said frame material, and a plurality of said wheels are arranged in line, wherein a dust-trapping sheet that has a width spanning an inside of the right and left bottom groove-like portions is laid on said bottom wall surface of said frame material.