Patent ID: 6845998

Claim:
A bicycle frame ( 10 ) comprising a main frame ( 12 ), consisting of a seat tube ( 16 ), a down tube ( 20 ) and a top tube ( 18 ) as well as a rear structure ( 14 ) with a pair of chain crossbars ( 46 ) and a pair of seat crossbars ( 56 ); said down tube ( 20 ) having a pedal bearing housing ( 38 ) at one end; wherein the chain crossbars ( 46 ) and the seat crossbars ( 56 ) are each connected at a rear end ( 50 , 58 ) to an end run ( 54 ); wherein the chain crossbars ( 46 ) are each connected at a front end ( 48 ) to a first fixed frame linkage point ( 40 ) of the main frame ( 12 ); wherein the seat crossbars ( 56 ) are each connected at a front end ( 60 ) to a see saw having three linkage points ( 62 , 66 , 68 ); wherein a first see saw linkage point ( 62 ) is connected to the front ends ( 60 ) of a seat crossbars ( 56 ), the second see saw linkage point ( 66 ) is pivotally connected to a second fixed frame linkage point ( 42 ) of the main frame ( 12 ), and a third see saw linkage point ( 68 ) is pivotally connected to a first end ( 70 ) of a spring cushioning element ( 72 ); and wherein a second end ( 74 ) of the spring cushioning element ( 72 ) is connected to a chain cross bar bracket ( 78 ) extending from the front ends ( 48 ) of the chain crossbars ( 46 ).