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Compared with a conventional system with a shorter force arm, the longer force arm between crank and chainwheel increases the force moment, enabling energy-saving pedalling and reducing rider effort and manual 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is the main purpose of the disclosed pedalling device?","Question",{"text":62,"@type":63},"It enables the rider to step the pedals in an energy-saving manner by increasing the force moment of the pedalling device.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"How does the invention differ from a conventional bicycle pedalling device?",{"text":67,"@type":63},"The conventional design has a shorter force arm between the chainwheel center and each pedal, requiring a larger stepping force, whereas this invention provides a longer force arm between the crank and chainwheel.",{"name":69,"@type":60,"acceptedAnswer":70},"What key components are included in the pedalling device?",{"text":71,"@type":63},"It includes a support seat, rotation shaft, chainwheel, two opposite one-way ratchet wheels, two opposite drive members with ratchet sockets and slide tracks, a crank, two drive shafts, two pedals, and two slide 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for a bicycle includes a support seat (13), a rotation shaft (111), achainwheel (11), two opposite oneway ratchet wheels (40), two opposite drive members (30), a crank (12), two opposite drive shafts (141), two pedals (14), and two opposite slide seats (50) . Thus, the drive members have a longer force arm between the crank and the chainwheel so as to increase the force moment of the pedalling device so that the rider can step the pedals in an energy-saving manner, thereby saving the rider's energy and manual work.  \nDESCRIPTION  \nPedalling device for bicycle  \nTechnical field to which invention relates  \nThe present invention relates to a pedalling device and, more particularly, to a pedalling device for a bicycle.  \nIndication of background art  \nA conventional pedalling device for a bicycle in accordance with the prior art shown in Fig.  \n10 comprises a crank 60, two pedals 61, a chainwheel 62, and a chain 64. Thus, when the crank 60 is driven by the pedals 61, the chainwheel 62 is rotated by the crank 60 to drive the chain 64 so as to move the bicycle. However, the force arm defined between the center of the chainwheel 62 and each of the pedals 61 has a smaller length, so that the rider has to exert a larger stepping force on the pedals 61 so as to move the bicycle, thereby greatly wasting the rider's energy and manual work.  \nTechnical problem to be solved  \nThe objective of the present invention is to provide a pedalling device, and more particular a pedalling device for a bicycle, wherein the rider can step the pedals in an energy-saving manner.  \nDisclosure of invention  \nIn accordance with the present invention, there is provided a pedalling device, comprising a support seat, a rotation shaft rotatably mounted on a first end of the support seat, achainwheel secured on and rotated by the rotation shaft, two opposite oneway ratchet wheels each mounted on the rotation shaft to rotate the rotation shaft, two opposite drive members each having a first end formed with a ratchet socket mounted on a respective ratchet wheel to rotate the respective ratchet wheel in a oneway manner and a second end formed with on elongate slide track, a crank pivotally mounted on a second end of the support seat, two opposite drive shafts secured on two opposite sides of the crank to rotate the crank, two pedals each rotatably mounted on a respective drive shaft, and two opposite slide seats each pivotally mounted on a respective drive shaft to move therewith and each slidably mounted in the slide track of a respective drive member.  \nAdvantageously, the drive members have a longer force arm between the crank and the chainwheel so as to increase the force moment of the pedalling device, thereby saving the rider’s energy and manual work.  \nFurther benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.  \nBrief description of drawings  \nFig. 1 is a perspective view of a pedalling device in accordance with the preferred embodiment of the present invention.  \nFig. 2 is an exploded perspective view of the pedalling device as shown in Fig. 1.  \nFig. 3 is a plan view of the pedalling device for a bicycle as shown in Fig. 1.  \nFig. 4 is a plan cross-sectional view of the pedalling device as shown in Fig. 1.  \nFig. 5 is a plan cross-sectional view of the pedalling device as shown in Fig. 1.  \nFig. 6 is a plan cross-sectional operational view of the pedalling device as shown in Fig. 1. Fig. 7 is a locally enlarged view of the pedalling device as shown in Fig. 6.  \nFig. 8 is a schematic operational view of the pedalling device as shown in Fig. 6.  \nFig. 9 is a schematic operational view of the pedalling device as shown in Fig. 7.  \nFig. 10 is a perspective view of a conventional pedalling device for a bicycle in ac","cbCaihYEtG4aotmo","https://ap.wps.com/l/cbCaihYEtG4aotmo","pdf",567112,"English","# Abstract\n# Description\n## Technical field to which invention relates\n## Indication of background art\n## Technical problem to be solved\n## Disclosure of invention\n## Brief description of drawings\n## Description of at least one way of carrying out the invention","[{\"question\":\"What is the main purpose of the disclosed pedalling device?\",\"answer\":\"It enables the rider to step the pedals in an energy-saving manner by increasing the force moment of the pedalling device.\"},{\"question\":\"How does the invention differ from a conventional bicycle pedalling device?\",\"answer\":\"The conventional design has a shorter force arm between the chainwheel center and each pedal, requiring a larger stepping force, whereas this invention provides a longer force arm between the crank and chainwheel.\"},{\"question\":\"What key components are included in the pedalling device?\",\"answer\":\"It includes a support seat, rotation shaft, chainwheel, two opposite one-way ratchet wheels, two opposite drive members with ratchet sockets and slide tracks, a crank, two drive shafts, two pedals, and two slide seats.\"}]","Pedalling device for bicycle - Description | PDF"]