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Failed Project Tow Childs Bicycle

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Failed Project Tow Childs Bicycle
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  http://www.instructables.com/id/Failed-Project-Tow-Childs-Bicycle/  Food   Living   Outside   Play   Technology   Workshop Failed Project: Tow Child's Bicycle by openproducts  on August 26, 2013 Table of Contents Failed Project: Tow Child's Bicycle .................................................................................................1 Intro: Failed Project: Tow Child's Bicycle .........................................................................................2 Step 1: Design Features .....................................................................................................4 Step 2: Suggestions for Further Work ...........................................................................................8 Step 3: License ............................................................................................................9 Related Instructables ........................................................................................................9 Advertisements ...............................................................................................................10 Comments ................................................................................................................10  http://www.instructables.com/id/Failed-Project-Tow-Childs-Bicycle/  Author: openproducts Openproduct's favorite activity is to release ideas and products under open source license. Visit the openproducts self-service webstore for ordering easycable clips or other products. Or check out the respective openproducts instructables to make your own! Intro: Failed Project: Tow Child's Bicycle The concept described in this Instructible has been inspired on the discussion in the Comments Section of the recently published openproducts' 'Parent-Child Tandem '(July 22nd, 2013 - based on a commercially available product) and kelseymh 's Instructable 'Failed attempt at a tow bar for child's bicycle ' (August 21st, 2013). This weekend project is meant to contribute to the discussion on towing child's bicycles. It was meant as a proof of concept but the attempt failed miserably. This device does not work as intended, it is very dangerous since the child might be thrown off the bicycle in a curve. See the next step for a more detailed description of the design failure.If you like failures you might also enjoy an earlier openproducts' adventure: 'Failed Project: Keeping Snails Away from a Vegetable Garden ' (June 3rd, 2013).Step 1 in this Instructable documents the 'design features' of this towing construction, while Step 2 provides some suggestions for possible further work. Finally, Step 3spends some words on the CC-BY license of this Instructable.  http://www.instructables.com/id/Failed-Project-Tow-Childs-Bicycle/   http://www.instructables.com/id/Failed-Project-Tow-Childs-Bicycle/  Step 1: Design Features The basic principle connecting a child's bicycle in tow to an adult bike is that the degrees of freedom of the following bicycle are being limited. Of the three possiblerotations two are allowed: tilting forward and backward (important for crossing a speed bump but also in curves) and turning left and right (important in curves,comparable to the principle of an articulated bus). The only rotation that is to be suppressed is tilting side to side: the child's bicycle should always keep the same positionas the towing bike (i.e. upright, or tilted towards the inside bend in a curve).The basic idea of the connector documented in this Instructable is that the two required degrees of freedom (tilting forward-backward and turning left-right) can beprovided perfectly by the front wheel and the steering wheel of the towed bike. A rigid connection of the front wheel of the child's bike to the frame of the towing bicyclewill then ensure (but it doesn't!) that the rear bicycle remains upright. Note that the front wheel is hovering above the street.The problem however is that the inclination of the child's bike fork causes a twist to the back bike: in a curve the rear bicycle will tilt to the outside curve, which isextremely dangerous. The child might fall off its bike.There is also a constructional issue to be mentioned. This design has been based on a new function of the fork, which has not been designed for this purpose. Keeping abicycle upright including its rider brings about much higher forces and moments in the wheel and the fork than expected for normal operation, likely to cause breaking ofthe rim, the spindle or the fork.Since this Instructable was meant as a proof of concept the rear bike has been fixed using clamps. In a more advanced testing stage these would have been replaced bya different fix. Moreover, wooden beams are not the most suitable for carrying these heavy loads.The next step provides some suggestions for further work, if any.

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Jul 23, 2017
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