A shock absorbing device is mounted between a stem and a front wheel axle of a bicycle to reduce shock that is transmitted to a handlebar, and includes a support leg disposed to swivel with the stem, a lever with a proximate end anchored relative to the axle and a distal end fitted to the support leg, a crank member with a journalled end journalled on the axle and a web portion coupling with one of the proximate end and the intermediate portion of the support leg and terminating at a coupling end. A friction brake member is disposed on the web portion and is movable to abut against another brake member mounted on a front hub of the bicycle as a result of a braking action, while taking up the inertial momentum of the front hub to turn the web portion as well as the coupling end so as to move one of the proximate end and the intermediate portion away from the other one of the intermediate portion and the proximate end, thereby counteracting the relative movement of the intermediate portion towards the proximate end stemming from the braking action.
The universal folding bicycle according to the invention has the front arm (1) that is attached to the head assembly (2) on the frame (3) where the front swing arm (4) with the front wheel (22) are attached. The freely adjustable handlebars (9) are attached. The freely adjustable handlebars (9) are attached to the head assembly (2) via the rotary joint (5), the telescopic rod (6) and the handlebar axis (8) or via the handlebar attachement (7). The back wheel (13) is attached to the back swing arm (10) connected to the central assembly (11) formed by the pedals and cranks 12) and mounted on the frame (3). The back swing arm (10) can be equipped by the accessory arm (26). The seat (16) on a telescopic stem (15) is attached to the end of the frame (3) or via the pin (14) to the beginning of the frame (3). The seat (16) may be located in the swing arm (23) and may be equipped by the telescopic seat springing (24) or by the arm springing (25). The front arm (1) and the swing front arm (4) are interconnected by the telescopic front wheel springing (18) or by the front wheel springing (19). The back swing arm (10) is connected to the end of the frame (3) via the back wheel telescopic springing (20) or by the back wheel springing (21). The front wheel (22) and the back wheel (13) are attached by the means of unilateral free bearing to the front swing arm (4) and to the back swing (10). The telescopic front wheel springing (18), the front wheel (19), the rotary joint (5), the telescopic back wheel springing (20), the back wheel springing (21), the handlebar axis (8), and the cranks with pedals (12) are all equipped by quick releases (18', 19', 5', 20', 21', 8', and 12'). The bicycle is folded by releasing the quick releases (5', 8', 12', 18', 19', 21', 21'), swinging the handlebars, the front wheel (22), the back wheel (13) and the seat (16) after sliding it out together with the telescopic stem (15) towards the frame (3). The bicycle design according to this invention permits production of all types of bicycles ranging from sport bikes to common utility ones for adults as well as for children.
