Patent ID: 7661519

Claim:
A roller device mountable rotatably on a spindle, comprising: a roller body including a tubular wall having two opposite open-end portions, each of said open-end portions being provided with a retaining member formed on an inner peripheral surface of said tubular wall, said tubular wall further having a plurality of angularly spaced-apart elongated ribs projecting inwardly from and extending axially along said inner peripheral surface of said tubular wall, and a plurality of angularly spaced-apart elongated grooves each confined between two adjacent ones of said elongated ribs; and two covers inserted respectively into said two opposite open-end portions of said tubular wall and being adapted to be sleeved rotatably around the spindle, each of said covers having an annular end wall transverse to one of said open-end portions, a surrounding wall extending inwardly and axially from an outer periphery of said annular end wall and abutting against said inner peripheral surface of said tubular wall, a tubular seat adapted to be sleeved around the spindle and extending axially and inwardly from said end wall within said surrounding wall, pairs of spaced-apart positioning blades disposed around and projecting radially and outwardly from said tubular seat, and an engaging member formed on an outer peripheral surface of said surrounding wall and interlocking said retaining member, said retaining member and said engaging member having recess-and-protrusion interlocking surfaces, each pair of said positioning blades being connected to said surrounding wall and projecting axially from said end wall into said tubular wall, and having blade ends extending into one of said grooves to prevent relative movement between said tubular wall and said covers.