An assembled roller comprising a cylindrical bush having eight external rib surface features and an over-molded roller. The joining edge of the opposing component parts comprises, in axial end profile, a ramp section comprising a ramp surface. The ramp surfaces lie in planes that are parallel or sli
An assembled roller comprising a cylindrical bush having eight external rib surface features and an over-molded roller. The joining edge of the opposing component parts comprises, in axial end profile, a ramp section comprising a ramp surface. The ramp surfaces lie in planes that are parallel or slightly offset by 1° to 20° to the direction or angle of approach of the respective opposed component part immediately prior to engagement, so that the ramp surfaces are adapted to slidingly engage across ramp surfaces in a resistance, rather than snap, fit. This arrangement forms a catch that will hold the component part halves together during an over-molding process as long as the ends of the bush are retarded against axial displacement.
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1. A generally cylindrical axel bush for mounting on a mounting section of an axel where it is not possible to slide the axel bush onto the axel mounting section via either end of the axel, the axel bush formed by joining component parts together along joinable edges, the joinable edges each followi
1. A generally cylindrical axel bush for mounting on a mounting section of an axel where it is not possible to slide the axel bush onto the axel mounting section via either end of the axel, the axel bush formed by joining component parts together along joinable edges, the joinable edges each following a line that is at least partially non-parallel to the longitudinal axis of the generally cylindrical bush, wherein: the component parts: each have two joinable edges and a first end wall and a second end wall; andfit togetherat least one of the joinable edges: has a substantially helical-shape or spiral-shape through an intermediate region of the joinable edge so that the component part partially wraps around the axel having a longitudinal axis; andends at a first end in a flat section,the flat section is adapted to resist counter-rotation of one of the component parts relative to another of the component parts; andthe first end wall of one of the component parts is off-set about the longitudinal axis by 60-110 degrees compared to the second end wall of the same component part. 2. The axel bush according to claim 1, wherein said joinable edges axially trap the other of the component parts so that the component parts do not slide along the join line relative to each other. 3. The axel bush according to claim 1, wherein at least one of said joinable edges is helically shaped. 4. The axel bush according to claim 1, wherein said flat section connects through a transition to the intermediate section, the transition comprising an angled corner having an angle that is at least 90° to resist counter-rotation of the component parts relative to one another. 5. The axel bush according to claim 1, wherein each of the joinable edges includes the flat section that extends parallel to the longitudinal axis of the formed bush. 6. The axel bush according to claim 1, wherein the axel bush when unassembled consists of two of the component parts that are separate and mateable or joinable together to form the axel bush. 7. The axel bush according to claim 1, wherein said component parts are identical to each other and include mutually resistant-fit engageable parts. 8. The axel bush according to claim 7, wherein the flat section contains features of the mutually resistant-fit engageable parts that temporarily hold the component parts together prior to over-molding of the axel bush with roller material. 9. The axel bush according to claim 7, wherein the resistant-fit engageable parts include, in profile and extending longitudinally along the joinable edges, a bayonet-head, an arrow-head or a ramp-head-shaped male mating portion having a protruding edge that transitions into a ramp surface that is inclined at an angle to a radial line extending from the longitudinal axis of the generally cylindrical bush. 10. The axel bush according to claim 9, wherein each component part is in the form of a semi-cylindrical wall terminating at either end in the first and second walls and one of the resistant-fit engageable parts includes the ramp head-shaped male mating portion that terminates with a detent wall connected with the semi-cylindrical wall of the component parts by a neck, whereby the combination of: the detent wall,an internal surface facing toward a radial center of the semi-cylindrical wall and forming part of the neck, anda broad face of the end wall of the cylindrical wall,together define a recess for receiving the ramp head-shaped portion, the ramp head-shaped portion in profile being formed at a terminal surface of the joinable edges of the opposed component part. 11. The axel bush of claim 1, wherein the joinable edges include complementary ramp sections that have opposing and abutting surfaces that permit movement of the component parts of an assembled bush relative to each other under load, but trap the component parts in engagement by preventing the component parts from being pulled laterally or radially away from each other. 12. The axel bush of claim 1, wherein, when the axel bush is assembled on an axel, it is axially trapped by axel features that axially retard the component parts, each of the component parts does not slide along the join line or rotate about the longitudinal axis relative to the other of the component parts. 13. The axel bush of claim 1, wherein the first and second end walls are semicircular end walls.
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