Patent ID: 6855080
Filing Date: 2005-02-15
Classification: F16C,F16G

Abstract:
1. A chain comprising inner link plates and outer link plates extending along a longitudinal direction of the chain on both sides thereof, the inner and outer link plates on each side of the chain overlapping one another, the inner link plates having inside surfaces facing each other; a roller located between two inner link plates, the roller being symmetrical about an axis of rotation and having end surfaces, each end surface of the roller being adjacent an inside surface of one of said two inner link plates; and a plurality of rolling members inside the roller; wherein the outer diameter of said roller is smaller than the widths of said inner link plates and said outer link plates, said widths being measured in directions mutually perpendicular to said axis of rotation of the roller and the longitudinal direction of the chain; and said roller is positioned so that it is accommodated within projections of the widths of the two inner link plates between which the roller is located and also between projections of the widths of the portions of said outer link plates which overlap said two inner link plates, the projections being in the direction of the axis of the roller; in which said two inner link plates are connected by a bushing having an outer circumferential portion in which the roller is a hollow roller having a cylindrical inside surface, and in which the rolling members of said plurality of rolling members are located inside the roller, between the cylindrical inside surface of the roller and the outer circumferential portion of the bushing; including a pair of substantially ring-shaped holders adjacent both ends of said roller, each ring-shaped holder having a plurality of pockets formed therein, and each of said pockets rotatably receiving an end portion of one of said rolling members, thereby preventing skew of said rolling members; and in which each of said ring-shaped holders has an outwardly extending, thrust-bearing, flange, each said flange is located between an end surface of said roller and an adjacent inside surface of an inner link plate, and each of said ring-shaped holders fits onto the outer circumferential portion of the bushing with a clearance.