Concentrator attachment for blower air tube

Patent metadata

Field	Value
Publication number	US-11523569-B2
Application number	US-201816200017-A
Country	US
Kind code	B2
Filing date	Nov 26, 2018
Priority date	Nov 26, 2018
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

A concentrator nozzle attachment for a blower device is disclosed that increases the airflow velocity of the blower without sacrificing the field of the jetting air. The concentrator nozzle is formed of an outer ring with a centrally located guide surface and is placed at the exit of an air tube. As the air exits the air tube, it's forced to flow around the guide surface, thus increasing its velocity. The attachment is secured to the end of the air tube and so does not alter the outer diameter through which the air exits. In this way, air velocity is increased without reducing its effectiveness.

First claim

The invention claimed is:

1. A blower device comprising:
a housing having a motor and a fan therein;
an air tube connected to a front portion of the housing for directing airflow to a distal end of the air tube, the distal end having a diameter defining an area of effect and a cross sectional area;
a concentrator connected to the distal end of the air tube, the concentrator positioning an air guide surface at the distal end of the air tube thereby reducing the cross sectional area without reducing the area of effect; and
wherein the guide surface is tear-drop shaped.

2. The blower device of claim 1 , wherein the guide surface has a rear portion and a front portion, the rear portion being partially inside the air tube and the front portion being partially outside the air tube, the front portion being exposed to the environment.

3. The blower device of claim 1 , wherein the concentrator has an outer ring that is secured to the air tube.

4. The blower device of claim 3 , wherein the air guide surface is connected to the outer ring by vanes.

5. The blower device of claim 3 , wherein the air guide surface is centered with respect to the air tube.

6. The blower device of claim 3 , wherein the outer ring has a length in the direction of airflow, the diameter of the outer ring being consistent along its length.

7. The blower device of claim 3 , wherein the concentrator is made of two pieces that are threadedly connected together.

8. The blower device of claim 3 , wherein the outer ring encircles a middle portion of the air guide surface, leaving a rear portion and a front portion uncovered.

9. The blower device of claim 1 , wherein the concentrator is substantially the same diameter as the air tube.

10. The blower device of claim 1 , wherein the concentrator has a substantially consistent diameter along its length.

11. The concentrator attachment of claim 1 , wherein the concentrator is connected to a distal end of the air tube, the concentrator positioning an air guide surface at the distal end thereby reducing the cross sectional area without reducing the area of effect of the air tube.

12. A concentrator attachment for a blower device, the concentrator attachment comprising:
an outer ring adapted to be secured to the end of an air tube;
a guide surface positioned within the outer ring, the guide surface having a rear portion and a front portion, wherein the outer ring encircles a middle portion of the guide surface;
wherein when the outer ring to secured to the air tube, the front portion of the guide surface is adapted to be outside the air tube and exposed to the environment; and
wherein the guide surface is tear-drop shaped.

13. The concentrator attachment of claim 12 , wherein the outer ring and the guide surface are made of separate pieces that are releasably connected together.

14. A method of increasing the air velocity of a blower device, comprising the steps of:
providing a blower having an air tube with a distal end, the distal having an area of effect and a cross sectional area;
placing a concentrator at the distal end of an air tube, wherein the concentrator includes a tear-drop shaped guide surface within the air flow path, wherein the concentrator reduces the cross sectional area without reducing the area of effect; and
turning on the blower device so that air is blown through the air tube, wherein prior to exiting the air tube the air is forced to move around the guide surface thus increasing its velocity.

Assignees

• Black & Decker Inc

Inventors

• Greene Nathan
• Nguyen Khoa Dang

Classifications

• A47L9/08

  with means adapted for blowing · CPC title

• A47L5/14

  cleaning by blowing-off, also combined with suction cleaning · CPC title

• A01G20/47 Primary

  Vacuum or blower devices · CPC title

• B05B1/3402

  to avoid or reduce turbulence, e.g. with fluid flow straightening means · CPC title

• F05B2240/123

  Nozzles · CPC title