Crank device and driving assembly for bicycle
US10611430B2 · kind B2 · utility
Inventor
Key dates
| Filing date | May 10, 2019 |
| Grant date | Apr 7, 2020 |
| Priority date | — |
| Expiry date | May 10, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H21/14
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In order to solve low strength and labor-saving of transmission mechanism of conventional crank assembly for a bicycle, this invention provides a crank device. The crank device of this invention includes: a housing (3) to be connected to a frame of the bicycle; a transmission member (4) accommodated in the housing (3) in a loose-fit manner; a supporting shaft (5) partially accommodated in the transmission member (4) in a loose-fit manner; and two driving assemblies (8, 9). Each of the driving assemblies (8, 9) includes: a driving member (82, 92) secured to transmission member (4) and to be connected to a sprocket of the bicycle, wherein one end of the supporting shaft (5) passes through the transmission member (4) and the driving member (82, 92) in a loose-fit manner; and a force arm (81, 91) including an ear (811) secured to the driving member (82, 92) and a bump (812) pivoted to the one end of the supporting shaft (5). This invention allows the crank device to transmit a large force and enhance labor-saving effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.