Retractable water board fin
US4805546A · kind A · utility
35Cited by
9References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1988 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Feb 1, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/20624
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A generally trapezoidal fin (22) is pivotally fastened to a casing which can receive the entire fin, permitting total retraction of the fin. The casing is formed with at least one notch (42) for selectively positioning the fin relative to the casing. In a preferred embodiment, the fin is operated by a lever member (26) which has a knob (50) at its distal end for use in positioning the fin (22) from above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.