Motorized fan
US6139277A · kind A · utility
19Cited by
21References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1998 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Dec 22, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/329
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A motor drives a hub having axially extending blind tapered recesses to receive tapered shoes on a plurality of blades, and threads which fasten a ring that presses the shoes axially into the recesses have a hand-direction that tend to tighten in response to the rotation of the shaft. The recess is partially defined by a forward downward sloping upper wall. The shoe includes a forward downward upper surface. The recess sloping wall functions as a positive stop for seating the shoe by engaging the sloping shoe surface and as a centrifugal force absorbing wall during rotation of the blades.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.