Composite bicycle fork
US5181732A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1991 |
| Grant date | Jan 26, 1993 |
| Priority date | — |
| Expiry date | Apr 30, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62K21/02
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing a bicycle fork comprising a steel steering spigot 11, a fork head 12 of fibre reinforced plastic, two fork arms 13 which likewise consist of fibre reinforced plastic and which are formed in one piece with the fork head 12 and axle mounts 14 inserted into the free ends of the fork arms 13 is characterized in that connection spigots provided on the axle mounts 14 are extended by a hard foam core 19; in that the hard foam core 19 is extended in the region of the fork head 12 by a plastic impregnated flexible foam core 22; in that a plastic impregnated flexible foam sheath 20 is laid around the connection spigots 21, around the hard foam core 19 and around the flexible foam core 22; in that subsequently various fibre reinforced sleeves 15, 16, 17, 18 are laid around the foam sleeve 20; in that then the upper parts of the fork head 12 containing the foam cores 22 are combined together into a single steering spigot connection parts 12a and are introduced, at least substantially into the lower end of the steering spigot 11, and in that the so-prepared blank is then brought in a heatable mould into its final shape and cured (FIG. 1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.