Front sprocket assembly for human-powered vehicle
US11691693B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 2021 |
| Grant date | Jul 4, 2023 |
| Priority date | — |
| Expiry date | Oct 30, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62M9/136
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A front sprocket assembly comprises a first sprocket and a second sprocket. The second sprocket includes a second sprocket body and a plurality of second sprocket teeth. At least one tooth of the plurality of second sprocket teeth includes a less chain-interference recess provided to the second axially inwardly facing surface. The less chain-interference recess is configured to reduce interference between the at least one tooth of the plurality of second sprocket teeth and a chain in an upshifting operation in which the chain is shifted from the first sprocket toward the second sprocket. The less chain-interference recess has a radially innermost end positioned radially inwardly from a tooth bottom circle of the plurality of second sprocket teeth. A radial distance radially defined from the tooth bottom circle to the radially innermost end with respect to a rotational center axis is equal to or larger than 1.0 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.