Patent ID: 7581630

Claim:
A weather-resistant roller device for a conveyer, comprising: a roller body having a tubular wall, and two axially opposite end walls connected to said tubular wall, said end walls respectively having indented wall regions each confining a receiving groove; a spindle supporting said roller body and extending through said indented wall regions, said spindle having two engaging parts of non-circular cross section projecting out of said end walls, respectively; and bearing assemblies sleeved on said spindle; said weather-resistant roller device being characterized by: two anti-leak assemblies each provided in a respective one of said receiving grooves and disposed around said spindle, each of said anti-leak assemblies having an outer fixed seal member disposed annularly around said spindle and extending from said spindle to one of said indented wall regions; and two protective caps each of which covers one of said engaging parts of said spindle and each of which has an inner skirt abutting sealingly against said outer fixed seal member of one of said anti-leak assemblies, and a hollow neck extending outwardly from said inner skirt, said hollow neck having a non-circular cross section and receiving fittingly one of said engaging parts; wherein each of said anti-leak assemblies further has an inner fixed seal member and a movable seal member both of which are disposed around said spindle, said outer and inner fixed seal members being fixed sealingly to said spindle, said movable seal member being disposed between said inner and outer fixed seal members and being fixed sealingly to said indented wall region of one of said end walls, said inner and outer fixed seal members respectively having radially spaced-apart first annular ribs extending around said spindle, said movable seal member including two opposite sides respectively facing said inner and outer fixed seal members and having a plurality of radially spaced-apart second annular ribs extending around said spindle, said first and second annular ribs extending toward each other in such a manner that each of said first annular ribs extends between two adjacent ones of said second annular ribs, whereby said inner and outer fixed seal members and said movable seal member form a labyrinthine structure that provides protection against entry of contaminants.