Bicycle frame with one or two improved wishbone stays
US5129665A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1990 |
| Grant date | Jul 14, 1992 |
| Priority date | — |
| Expiry date | Nov 21, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62K21/18
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A bicycle frame with improved rigidity and strength is disclosed. The frame has a truss portion and upper and lower stays for connecting a rear wheel to the truss portion of the frame. One or both of the stays comprise a U-shaped tubular member having a curved portion and two leg portions, the leg portions positioned to straddle the rear wheel, and a second tubular member extending between the truss portion of the frame and the curved portion of the U-shaped tubular member. The second tubular member is shaped at one end so as to terminate in gussets that at least partially surround the curved portion of the U-shaped member. In preferred embodiments, the second tubular member is flattened at the end connecting to the U-shaped tubular member to have an elliptical cross-section with an inside minor axis dimension substantially equal to the outside diameter of the U-shaped tubular member, and the gussets terminate at about the centerline of the U-shaped tubular member. Also in the preferred embodiment, an annular tube spacer is placed inside the second tubular member so as to be concentric with mounting holes formed through the front and back walls of the flattened portion of the secon…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.