Diffuser

Patent metadata

Field	Value
Publication number	US-9936788-B2
Application number	US-201615181927-A
Country	US
Kind code	B2
Filing date	Jun 14, 2016
Priority date	Jun 16, 2015
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A diffuser includes an air inlet for receiving an airflow from a hair dryer, a grille having a plurality of air outlets for emitting at least part of the airflow from the diffuser, a baffle having an outwardly tapering wall which defines a diffusing air chamber through which the airflow passes between the air inlet and the air outlets, and an external wall which surrounds the wall of the baffle to define a second air chamber therebetween. The second air chamber has a plurality of ports in fluid communication with the ambient atmosphere.

First claim

The invention claimed is:

1. A diffuser for attachment to an airflow outlet end of a hair dryer, the diffuser comprising:
at least one air inlet for receiving an airflow from a hair dryer;
a grille comprising a plurality of air outlets for emitting at least part of the airflow from the diffuser;
a baffle comprising an outwardly tapering wall which defines a diffusing air chamber through which the airflow passes between the at least one air inlet and the air outlets; and
an external wall which surrounds the wall of the baffle to define a second air chamber therebetween, wherein the second air chamber comprises a plurality of ports in fluid communication with the ambient atmosphere and the second air chamber is isolated from the diffusing air chamber.

2. The diffuser of claim 1 , wherein each of the ports is in the form of a slot.

3. The diffuser of claim 2 , wherein each slot is annular in shape.

4. The diffuser of claim 1 , wherein each of the ports is located proximate to a respective end of the external wall.

5. The diffuser of claim 1 , wherein at least one of the ports is located between the baffle and the external wall.

6. The diffuser of claim 1 , wherein the external wall surrounds the grille.

7. The diffuser of claim 6 , wherein at least one of the ports is located between the grille and the external wall.

8. The diffuser of claim 1 , wherein the external wall is generally frustoconical in shape.

9. The diffuser of claim 1 , wherein one of the baffle and the external wall comprises a plurality of spacers for engaging the other one of the baffle and the external wall.

10. The diffuser of claim 9 , wherein the spacers are angularly spaced about the longitudinal axis of the diffuser.

11. The diffuser of claim 10 , wherein the other one of the baffle and the external wall comprises an angular alignment member which is received between two adjacent spacers during assembly.

12. The diffuser of claim 9 , wherein, during assembly, the external wall is joined to the baffle at ends of the spacers.

13. The diffuser of claim 9 , wherein the spacers are located on an internal surface of the external wall.

14. The diffuser of claim 13 , wherein the spacers are integral with the external wall.

15. The diffuser of claim 13 , wherein the spacers are located between the ends of the external wall.

16. The diffuser of claim 1 , wherein the at least one air inlet is spaced from a longitudinal axis of the diffuser.

17. The diffuser of claim 1 , wherein the at least one air inlet comprises at least one slot.

18. The diffuser of claim 17 , wherein the at least one air inlet comprises an annular slot.

Assignees

• Dyson Technology Ltd

Inventors

• Stephens Philip Jonathan
• Smith Stephen Farrar

Classifications

• A45D20/122 Primary

  Diffusers, e.g. for variable air flow · CPC title

• A45D20/12 Primary

  Details thereof or accessories therefor, e.g. nozzles, stands · CPC title