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This invention has for its object the propulsion' of bi cycles, tricycles, etc. A driving gear is snpplied,' includ ing spring-actuated means which will assist in propelling the machine and permit the rider to rest while passing over level grades. By another device the vibrating weight pressure of the rider on the seat spring bar will assist in propelling the machine. The auxiliary spring driving mechanism will be of assistance in climbing hills and is arranged to prevent a retrograde movement.doi:10.1038/scientificamerican11241894-333 fatcat:czc5nbczzjbjzlvgvpsjhldu5i