Plastic monorail conveyor structure

A monorail conveyor structure comprising

• a longitudinally extending plastic inverted T-bar monorail track comprising
• a plurality of straight sections spliced together in longitudinally extending abutting end-to-end relationship, and a plurality of linearly arcuate sections spliced in end-to-end abutting relationship with at least some of said straight sections,
• each said T-bar monorail track straight or arcuate section comprises
• a longitudinally extending upstanding stem and a laterally outwardly directed flange extending from each side and at the distal end of said stem, said flanges lying substantially in a plane transversely of said stem, the upper surfaces of said flanges being inclined slightly downwardly from said stem, a substantially medial longitudinally extending web portion between said flanges therebelow, each said flange having an upwardly laterally outwardly curved underside surface portion adjacent and at each side of said web portion, blending into a substantially planar underside surface portion extending laterally outwardly to the distal edge of said flange,
• means affixed to and supporting said track in an elevated attitude,
• and a plurality of plastic conveyor article-suspending trolleys operatively translatable on said track, and comprising
• a pair of complementary, opposedly facing, plastic, easily detachably conjoined trolley arms, each having an upper portion, an intermediate portion and a lower end portion, a plastic trolley upper wheel freely rotatable on each said trolley arm and in rolling bearing contact upon said flange upper surfaces,
• a plastic stub axle for each said trolley upper wheel easily removably attached to and adjacent the inward face of the upper portion of each said trolley arm,
• a pair of plastic trolley lower wheels easily removably and rotatably mounted on each said trolley arm in parallel spaced apart relationship,
• abutting bearing portions for each said pair of lower wheels projecting inwardly from the intermediate portion of each said trolley arm,
• means detachably connecting said trolley arms together at said abutting bearing portions,
• said bearing portions for each said pair of trolley lower wheels being aligned axially and in abutting inner end-to-end relationship,
• means intermediate the ends of said bearing portions limiting laterally outward travel of said trolley wheels said upwardly laterally outwardly curved underside surface portions of said flanges limiting laterally inward travel of said lower wheels,
• said two pairs of lower wheels rotatable in a common plane below and substantially parallel with the plane of said upper wheels,
• said lower wheels being shaped to cooperatively function with said track underside surface portions, a pendant member removably secured to and between the conjoined lower end portions of said trolley arms, and a power activated drive chain operatively engaged with said trolley to translate the same on said track.