Ceiling fan blade

Patent metadata

Field	Value
Publication number	US-11261877-B2
Application number	US-201916660182-A
Country	US
Kind code	B2
Filing date	Oct 22, 2019
Priority date	Jan 15, 2019
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A ceiling fan or similar air-moving device can include a motor for rotating one or more blades to drive a volume of air about a space. The blade can include a body having an outer surface with a flat top surface and a flat bottom surface, and a side edge. The top surface includes a chamfered portion extending between a flat portion, and the side edge.

First claim

What is claimed is:

1. A blade for a ceiling fan, the blade comprising:
a body comprising:
a root;
a tip spaced from the root, defining a span-wise direction therebetween;
a planar upper surface;
a lower surface;
a leading edge and a trailing edge, each spacing the upper surface and the lower surface and defining a chord-wise direction between the leading edge and the trailing edge; and
a chamfered portion extending only along the tip between the leading edge and the trailing edge, and transitioning between the leading edge tip and the upper surface.

2. The blade of claim 1 wherein the chamfered portion is arranged at an angle relative to the upper surface, and the angle is less than 180-degrees and greater than 90-degrees.

3. The blade of claim 2 wherein the angle is less than 175-degrees and greater than 155-degrees.

4. The blade of claim 1 further comprising a rounded transition between the chamfered portion and the tip.

5. The blade of claim 1 wherein the chamfered portion extends in the span-wise direction between 5% and 40% of the chord-wise width of the blade.

6. The blade of claim 1 wherein the leading edge and the trailing edge are planar and arranged perpendicular to the upper surface and the lower surface.

7. The blade of claim 6 wherein both of the tip is wholly radiused.

8. The blade of claim 7 further comprising rounded transitions connecting the tip to the upper surface.

9. The blade of claim 1 wherein the at least one of the leading edge or the trailing edge is wholly radiused.

10. A blade for a ceiling fan comprising:
a body including a root and a tip, defining a spanwise direction therebetween, and a first edge and a second edge, defining a chord-wise direction therebetween, the body further including a top surface and a bottom surface; and
a chamfered portion provided only along the tip between the first edge and the second edge, and extending between the top surface and the tip.

11. The blade of claim 10 wherein the chamfered portion is planar.

12. A blade for a ceiling fan comprising:
a body including a root and a tip, defining a spanwise direction therebetween, and a first edge and a second edge, defining a chord-wise direction therebetween, the body further including a top surface and a bottom surface;
a chamfered portion provided only along the tip, spacing the top surface from the tip;
wherein the angle for the chamfered portion relative to the top surface is between 155-degrees and 175-degrees; and
wherein the chamfered portion extends between 5% and 40% of the chord-wise width of the blade.

13. The blade of claim 12 wherein the chamfered portion extends fully between the first edge and the second edge.

14. The blade of claim 13 wherein the first edge and the second edge extending along the tip are planar, spacing the bottom surface from the chamfered portion.

15. The blade of claim 1 wherein the chamfered portion terminates at the leading edge and the trailing edge.

16. The blade of claim 10 wherein the chamfered portion terminates at the first edge and the second edge.

17. The blade of claim 12 wherein the chamfered portion terminates at the first edge and the second edge.

Assignees

• Hunter Fan Co

Inventors

• Norwood Bobby Neal
• Botkin Charles William

Classifications

• F05D2240/301

  Cross-sectional characteristics · CPC title

• F01D5/141

  Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147) · CPC title

• F05D2250/17

  hyperbolic · CPC title

• F04D29/384 Primary

  characterised by form · CPC title

• F04D25/088 Primary

  Ceiling fans · CPC title