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PERSONAL TRANSPORT: GROUND, WATER, AIR
Bicycle in a suitcase. Personal transport
Directory / Personal transport: land, water, air Folding bike today will not surprise anyone. However, its dimensions, even when folded, are not so small, and it is not always convenient to store it at home, and even more so transport it by bus or tram. My goal was to develop a comfortable folding bike with the smallest possible dimensions when folded. I wanted it to be easily transformed into a suitcase the size of a familiar "diplomat". I will say right away that this was not achieved, but I still did to design a two-wheeled car, which, after transformation, fits in a suitcase or bag with dimensions of 650x450x150 mm. The product has dutik wheels from a children's bicycle (or scooter) with tires marked 250x56. In case you have other wheels, you will have to make changes to the design of the folding bike. The bicycle frame is of a spinal type, it is bent from a pipe with an outer diameter of 40 mm and a wall thickness of 2-2,5 mm. In front of the frame there is a hinged joint, consisting of two figured three-millimeter steel plates. The plates are attached to the frame by welding. The holes for the hinge and the fixing bolt are drilled in the plates and cut after welding. On the opposite side of the spinal tube, the bearing assembly of the drive sprocket is welded - the carriage body. It is not necessary to do it yourself - a carriage from almost any bicycle will do. A locking device is welded to the frame near the carriage, with the help of which the rear fork is securely joined to the frame. I note that this node is best mounted "in place" in the process of assembling a bicycle. This will ensure that the mating parts - both the one on the frame and the one on the rear fork - will clearly match when the bike is folded. How this is done, I will tell later, when we talk about assembling a two-wheeled tire. The front fork is similar in design to a 180° moped fork. It consists of fixed and swivel parts. The turning part is welded from a bicycle steering column (cut off from the frame of an old bicycle) and two feathers, each of which is welded from two pipes that telescopically fit into each other. The outer diameter of the larger pipe is about 30 mm, the wall thickness is 2 mm, the inner diameter is about 20 mm, the wall thickness is 2 - 2,5 mm. The ends of the feathers are flattened, and holes are drilled in them in accordance with the diameter of the axle of the bicycle wheel. The steering column is welded with feathers using two bridges - plates made of a sheet about 3 mm thick with holes drilled in them for the column and feathers. The stationary part of the front fork is a steel tube, the outer diameter of which is the same as that of a bicycle steering column welded into the turntable of the fork. Another pipe is inserted into the latter and fixed by welding - of such a diameter that the bearings of a bicycle steering column are mounted on it. On the fixed part of the front fork, the turning unit is also fixed, relative to which the front part of the bicycle is folded, as well as the "ear" for the fixing bolt that holds the front fork in the working position.
Two clamps are fixed on the upper bridge of the front fork, which secure the semi-arcs of the steering wheel - they can be bent independently from sheet steel or purchased at a store that sells spare parts for mopeds and motorcycles. The rear fork is welded from two feathers - pieces of steel pipes with a diameter of 20 - 22 mm with a wall thickness of about 2,5 mm. In its rear part, two figured steel plates 3 mm thick with a longitudinal groove are welded in - the rear wheel of the bicycle is fixed in them. Two steel rings are welded on the front, which together with the carriage perform the function of a hinge. The right and left feathers are connected into a single welded assembly using two tubular cross members. I note that the swivel of the rear fork and frame is one-piece. It's better to do it this way. To begin with, the right and left fork feathers are prepared - that is, hinge rings and curly plates are welded to the pipes. Next, the feathers are mounted on the carriage and temporarily connected using a wooden block and a steel wire tie. Carefully check the functioning of the hinge - the frame and the rear fork should turn easily relative to each other and not have much play. Next, the crossbars are adjusted to the feathers and grabbed by two or three welding points. After removing the wire tie and removing the wooden block, verify that the hinge is working reliably and finally weld the joints of the assembly. The bicycle handlebar consists of two semi-arcs, fixed with two clamps on the upper bridge of the front fork. For the steering wheel, thin-walled steel pipes with a diameter of 22x1,5 mm are suitable. They should be bent, having previously been stuffed with sand and heated with a blowtorch or in a forge. The saddle is a regular bicycle. Seat tube in comparison with the usual, elongated. Its length is about 400 mm. It is fixed in a split pipe, to which two "ears" are welded with a through hole with a diameter of 8 mm. It turns out a kind of collet, which is tightened with an M8 bolt with a wing nut. Assembly. First attach the locking device to the frame and rear fork. It consists of two mating parts connected when the bike is unfolded into the working position with two bolts and wing nuts. The first one consists of two steel plates 6 mm thick welded in the form of the letter T. The second is a section of a U-shaped steel channel with a wall thickness of about 6 mm.
The fixing device is fixed on the bicycle, as already mentioned, "in place". To do this, after the manufacture of its counterparts, they are bolted together and adjusted to the frame and rear fork, installed in the position shown in the drawing. After that, the fixing device is attached to the frame and the rear fork, its performance is checked, and it is finally welded. To store or transport a folding bike, you will need a suitcase with dimensions, as already mentioned, 650x450x150 mm. If you can’t pick it up, you can sew a bag of this size yourself - from artificial leather or tarpaulin. To keep it in shape, a steel wire with a diameter of 5 mm is sewn in along the perimeter (in the side view), and a plywood plate is sewn into the upper part (under the handle). Folding the bike is as follows. First, the wing nut is unscrewed from the retainer bolt that secures the front fork in the working position. The steering wheel half-arcs are also disconnected and the saddle is removed. Next, the front fork turns clockwise until it stops. After that, the wing nuts of the central fixing device are unscrewed, and the rear fork is turned clockwise until it stops. The saddle is detached from the seat tube. The pedals turn out and screw in from the inside of the levers. All parts and components of the bike are freely placed in the same suitcase. Assembling and disassembling the bike takes no more than ten minutes. Author: Z.Slavets
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