BICYCLE WITH A FRAME OF TUBES CONNECTED TO EACH OTHER SO THAT THEY CAN PIVOT

摘要

A bicycle (1) has a frame (3) consisting of a head tube (5), a bottom bracket tube (7) and a top and a down tube (9, 11). The tubes of the frame (3) are connected to each other so that they can pivot and form a four bar system. Furthermore, the bicycle (1) has a saddle (27) that is attached to a seat post (29), which is connected to the top tube (11) so that it can pivot. By tilting the bottom bracket tube (7) downwards the head tube (5) is also pulled downwards, as a result of which the bicycle (1) is brought from a normal position to a recumbent position. Tilting the bottom bracket tube (7) downwards takes place by exerting a force, for example the user’s weight, on the saddle (27) of the bicycle (1). This force is transmitted to the bottom bracket tube (7) through an auxiliary connecting bar (39), which is connected to the seat post (29) and the bottom bracket tube (7) so that it can pivot. This force causes the bottom bracket tube (7) to pivot about the connecting point (37) on the top tube (11). The bottom bracket tube (7) pushes the down tube (9) forward, as a result of which the head tube (5) also tilts to the recumbent position.