US Patent 7766358 Device for connecting bicycles in tandem

There is disclosed a device for connecting a lead bicycle and a trailing bicycle into a tandem configuration consisting of first and second connectors attachable to, for example, the seat post of the lead bicycle and to the head post or frame of the trailing bicycle, respectively; a telescoping linking bar releaseably attachable to the two connectors, the linking bar having a section that allows a limited amount of flexing longitudinal travel; wherein the linking bar connections permit horizontal, vertical and torsional rotation and which release and de-couple the bicycles when rotation exceeds predetermined limits, which may occur when one bicycle falls or the trailing bicycle begins to pass the lead bicycle.