Patent ID: 7780559

Claim:
A chain transmission comprising: a) a single driving sprocket; b) a single tension roller; c) a single driven sprocket; and d) a chain encircling said driving sprocket and said tension roller; said chain traversing an approximately semicircular path around said tension roller when in contact with said driven sprocket; said chain mesh with said driving sprocket and said driven sprocket; said tension roller tensioning said chain along its entire length and pressing said chain against said driven sprocket; said driving sprocket and tension roller being inside said chain; said driven sprocket being outside said chain; said chain comprising: a plurality of alternating outer links and inner links connected to each other; each of said links comprising: a) a pair of solid, planar, spaced apart, equilateral triangular plates of identical size and shape, each having a base and a top; b) two base pins; c) a top pin; d) two base rollers; and e) a top roller; said plates joined together by said base pins at said base and said top pin at said top with said base roller entirely between said plates and rotatably mounted on each of said base pins and said top roller entirely between said plates and rotatably mounted on said top pin: said base pins also connecting together alternating outer overlapping links and inner overlapped links; said plates being spaced apart sufficiently to permit the teeth of said driving sprocket to pass between said plates; only the bottom rollers engage the driving sprocket, and only the top rollers engage the driven sprocket.