Patent ID: 6662544
Filing Date: 2003-12-16
Classification: F16G

Abstract:
A chain composed of multiple chain units each comprising:two outer plates, two inner plates and a pin to secure engagement between the outer plates and the inner plates, wherein each outer plate has two circular faces respectively and oppositely formed on a side of the outer plate, two pin holes respectively defined in the two circular faces, each inner plate has two hollow cones respectively and oppositely formed on a side of the inner plate, with each hollow cone having a first end, a second end and an inner face extending between the first and second ends, with each of the hollow cones including a tube formed on the second end of the hollow cone, with the tube having an outer periphery interconnected to the inner face, with a space being defined between the inner face of the hollow cone and the outer periphery of the tube to receive therein oil, with a rivet hole being defined in the tube misaligned with the outer periphery and to align with the pin hole in the outer plate, whereby when the chain unit is assembled, two inner plates are combined by engaging two tubes together to align the two rivet holes of the respective inner plate and the two outer plates are applied to a respective one of the two engaged inner plates with the rivets holes aligned with the two pin holes respectively so that the pin is applied to extend through the aligned pin hole and the two aligned rivet holes to secure engagement of the chain unit, thereby oil in the oil receiving space is able to seep through the rivet holes to lubricate the pin and the outer plates as well as the inner plates.