Ceiling fan
US12078183B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2020 |
| Grant date | Sep 3, 2024 |
| Priority date | — |
| Expiry date | Mar 23, 2041 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/646
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fan blade includes a blade body blowing air and a root portion secured to a support part. A first end part of a fall prevention member is attached to a first mount portion provided in the support part, and a second end part of the fall prevention member is attached to a second mount portion provided in the blade body. A controller controls electric energization to a DC motor to cause the fan blade to stop rotating when the fan blade breaks, the blade body is retained by the fall prevention member, the blade body is tilted, and at least one of a current value or a rotation speed measured by a measurer changes from a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.