Patent ID: 6085613
Filing Date: 2000-07-11
Classification: B62M,Y10T

Abstract:
A crankset without a dead center position, including:a fixed bottom bracket tube;a hollow outer spindle rotatably mounted about a first axis by first bearings in said bottom bracket tube and attached to a first crank;an inner spindle rotatably mounted by second bearings coaxially in said outer spindle and attached to a second crank;sealing means for assuring sealed protection of said bearings as regards an exterior of said crankset;an output member rotatably mounted about a second axis parallel to and offset with respect to said first axis on an eccentric member fixed to said bottom bracket tube, said output member being intended for driving a mechanical transmission; anda first articulated linkage connecting said output member to one of the first crank and the outer spindle, and a second articulated linkage connecting said output member to one of the second crank and the inner spindle,wherein said sealing means include first sealing means, disposed around said outer spindle in said bottom bracket tube and protecting said first bearings as regards an exterior of said tube, and second sealing means, disposed in said outer spindle and protecting said second bearings as regards an exterior of said spindle,and wherein said second sealing means include an annular sealing gasket, which obturates an annular gap between said outer spindle and said inner spindle on the side of said second crank, and closing means which obturate in a sealed manner a central bore of said outer spindle on the side of said first crank.