Hand held appliance

• US 10,016,040 B2
• Filed: 03/28/2013
• Issued: 07/10/2018
• Est. Priority Date: 03/30/2012
• Status: Active Grant

• Current Assignee: Dyson Technology Limited (Beeswax Holdings UK Limited)
• Original Assignee: Dyson Technology Limited (Beeswax Holdings UK Limited)
• Inventors: Courtney, Stephen Benjamin, Moloney, Patrick Joseph William, Gammack, Peter David
• Primary Examiner(s): Lu, Jiping
• Assistant Examiner(s): YUEN, JESSICA JIPING
• Application Number:
  US13/852,754
• Publication Number:
  US 20130276320A1
• Time in Patent Office: 1,930 Days
• CPC Class Codes: A45D 20/00 Hair drying devices; Accessories therefor A45D2/00 takes precedence
• CPC Class Codes: A45D 20/10 Hand-held drying devices, e.g. air douches
• CPC Class Codes: A45D 20/12 Details thereof or accessories therefor, e.g. nozzles, stands
• CPC Class Codes: F24H 3/0423 hand-held air guns
• CPC Class Codes: F26B 21/003 Supply-air or gas filters

Abstract

A hand held appliance, such as a hairdryer, includes a body, a duct, a fluid flow path extending through the duct from a first fluid inlet of the appliance to a first fluid outlet of the appliance. A primary fluid flow path extends from a second fluid inlet through which a primary fluid flow enters the appliance to a second fluid outlet. A fan unit is located in the primary fluid flow path for drawing fluid through the second fluid inlet. A filter is located in the primary fluid flow path. Fluid is drawn through the fluid flow path by fluid emitted from the second fluid outlet. A heater is provided in the body and extends at least partially along and around the duct.

Claims

1. A hairdryer comprising a body having a first fluid inlet at a rear end of the body and a first fluid outlet at a front end of the body, a first duct comprising a wall, wherein the wall extends from the first fluid inlet to the first fluid outlet, a fluid flow path extending through the first duct from the first fluid inlet through which a first fluid flow enters the hairdryer to the first fluid outlet for emitting the first fluid flow from the hairdryer, a second duct at least partially forming a primary fluid flow path that extends from a second fluid inlet through which a primary fluid flow enters the hairdryer to a second fluid outlet, a fan unit located in the primary fluid flow path for drawing fluid through the second fluid inlet, and a filter located in the primary fluid flow path, wherein fluid is drawn through the fluid flow path by fluid emitted from the second fluid outlet, wherein a heater is provided in the primary fluid flow path and the heater extends at least partially along and around the first duct, wherein the second duct comprises a handle of the hairdryer, a first end of the second duct is connected to the body, and the primary fluid flow path extends through the handle from a second end of the second duct, and wherein the second fluid inlet is located at or near an end of an inlet portion of the second duct and the fan unit is located in the second duct between the inlet portion and the body.

2. The hairdryer of claim 1, wherein the filter is located upstream of the fan unit.

3. The hairdryer of claim 2, wherein the fan unit comprises a motor, and the filter is located upstream of the motor.

4. The hairdryer of claim 1, wherein the filter is located upstream of the heater.

5. The hairdryer of claim 1, wherein the filter is located at, or adjacent, the second fluid inlet.

6. The hairdryer of claim 1, wherein the fluid flow path is linear.

7. The hairdryer of claim 6, wherein the body has an axial direction defined by the fluid flow path.

8. The hairdryer of claim 7, wherein the heater has a length extending in the axial direction of the body.

9. The hairdryer of claim 1, wherein the second fluid inlet and the filter are annular in shape.

10. The hairdryer of claim 1, wherein the fluid flow path is accessible to a user.

11. The hairdryer of claim 1, wherein the primary fluid flow path is non-linear.

12. The hairdryer of claim 1, wherein the second fluid outlet extends about the fluid flow path.

13. The hairdryer of claim 1, wherein the second fluid outlet is annular.

14. The hairdryer of claim 1, wherein the second fluid outlet is arranged to emit fluid into the fluid flow path.

15. The hairdryer of claim 1, wherein the second fluid outlet extends about the first fluid outlet.

16. The hairdryer of claim 1, wherein the first duct extends from the first fluid inlet.

17. A hand held appliance comprising a body having a first fluid inlet at a rear end of the body and a first fluid outlet at a front end of the body, a first duct comprising a wall, wherein the wall extends from the first fluid inlet to the first fluid outlet, a fluid flow path extending through the first duct from the first fluid inlet through which a first fluid flow enters the appliance to the first fluid outlet for emitting the first fluid flow from the appliance, a second duct at least partially forming a primary fluid flow path that extends from a second fluid inlet through which a primary fluid flow enters the appliance to a second fluid outlet, a fan unit located in the primary fluid flow path for drawing fluid through the second fluid inlet, and a filter located in the primary fluid flow path, wherein fluid is drawn through the fluid flow path by fluid emitted from the second fluid outlet, wherein a heater is provided in the primary fluid flow path and the heater extends at least partially along and around the first duct, wherein the second duct comprises a handle of the hairdryer, a first end of the second duct is connected to the body, and the primary fluid flow path extends through the handle from a second end of the second duct, and wherein the second fluid inlet is located at or near an end of an inlet portion of the second duct and the fan unit is located in the second duct between the inlet portion and the body.

18. A hairdryer comprising a body having a first fluid inlet at a rear end of the body and a first fluid outlet at a front end of the body and a first duct, the body comprises a second duct having a wall, wherein the wall extends from the first fluid inlet to the first fluid outlet, a fluid flow path extending through the second duct from the first fluid inlet through which a first fluid flow enters the hairdryer to the first fluid outlet for emitting the first fluid flow from the hairdryer, a primary fluid flow path extending from a second fluid inlet through which a primary fluid flow enters the hairdryer to a second fluid outlet, a fan unit located in the primary fluid flow path for drawing fluid through the second fluid inlet, a filter located in the primary fluid flow path, wherein fluid is drawn through the fluid flow path by fluid emitted from the second fluid outlet and wherein a heater is provided in the primary fluid flow path and the heater extends at least partially along and around the second duct, wherein the first duct comprises a handle of the hairdryer, a first end of the first duct is connected to the body, and the primary fluid flow path extends through the first duct from a second end of the first duct, and wherein the second fluid inlet is located at or near an end of an inlet portion of the second duct and the fan unit is located in the second duct between the inlet portion and the body.