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Bicycle Trailers (Practical Action Technical Brief)
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== How to make a bicycle trailer == The cycle trailers are made in small village workshops from iron tubing, which is cut, bent, welded and drilled to make the frame and wheels. Modifications are also carried out to the trailers in these workshops at the request of the buyers. Figure 3 shows one of the designs produced by Practical Action The frame needs to be strong and rigid but as light as possible. Thin wall tube gives the best design but is not always available or affordable and some skill is needed to weld the thin material. {{Step | number = 1 | text = Piyasena uses his cycle trailer as a mobile mini store and kitchen. Hambamtota District, Sri Lanka. ©Zul/Practical Action | image = bicycle_trailers_ministore.jpg }} {{Step | number = 2 | text = A cycle trailer used as a mobile library for school children in Sri Lanka ©Zul/Practical Action | image = bicycle_trailers_mobilelibrary.jpg }} {{Step | number = 3 | image = bicycle_trailers_diagram1.jpg }} {{Step | number = 4 | text = The frame construction is made up from welded steel tube | image = bicycle_trailers_frameconstruction.jpg }} {{Step | number = 5 | text = The figure shows a frame that can be made from angle and bar | image = frame1and2.jpg }} {{Step | number = 6 | text = Hitch design. A stee or rubber ball drops into a socket formed from flat bar or cut from a pipe bolted to the carrier or frame of the bicycle | image = bicycle_trailers_hitch.jpg }} === Details of the Frame Construction === The component parts to the frame design are listed in table 1 {| ! Part ! Description ! Qty ! Material ! Semi Finished Dimensions |- | 1 | Round Tube | 1 | Mild Steel | 19.05 x 2713 |- | 2 | Square Tube | 2 | Mild Steel | 19.05 x 914 |- | 3 | Square Tube | 5 | Mild Steel | 19.05 x 623 |- | 4 | Square Tube | 6 | Mild Steel | 19.05 x 382 |- | 5 | Square Tube | 4 | Mild Steel | 19.05 x 877 |- | 6 | Square Tube | 2 | Mild Steel | 19.05 x 445 |- | 7 | 'L' Angle | 6 | Mild Steel | 19.05 x 19.05 x 125 |- | 8 | Rod | 2 | Mild Steel | 09 x 240 |- | 9 | Wheel Mounting | 4 | Mild Steel | 50.8 x 50.8 x 6.35 |- | 10 | Plank | 2 | Wood | 873 x 126 x 15 |- | 11 | Hitch (Male) | 1 | Mild Steel | |- | 12 | Round Tube | 1 | Mild Steel | 19.05 x 560 |} Table 1: Parts list for the bicycle trailer frame. === Hitch === Although hitching the trailer at the level of the rear axle has the least effect on the stability of the bicycle, hitching above the rear wheel. (to the carrier or to the frame below the seat) is simpler and more compatible with duel use of the trailer as a handcart. This method has been widely tested on earth roads and tracks in various countries and has caused no problems for the trailer users. Various hitch mechanisms may be used, the requirement being that they are strong and durable and do not constrain relative movement between the bicycle and the trailer. The recommended mechanism is a rubber ball in a steel socket attached to the carrier or the rear wheel stays, but in some cases, the trailer has simply been tied to the carrier. === Wheels === Normal bicycle wheels are suitable for light loads on good roads but are not robust enough for carrying heavy loads or for use on rough tracks. Strengthened wheels that take standard bicycle tyres have been developed for trailers.
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