Dust extraction system for a power tool

Patent metadata

Field	Value
Publication number	US-9855632-B2
Application number	US-201213431312-A
Country	US
Kind code	B2
Filing date	Mar 27, 2012
Priority date	Mar 27, 2012
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A dust extraction system for a power tool having a output shaft, a collet configured for engaging a tool bit and a collet nut engageable to the output shaft, comprises a base configured for mounting on the power tool, the base defining a cavity having an opening for passage of the output shaft therethrough and a discharge chute in communication with the cavity. The system further includes an impeller sized and configured to be rotatably received within the cavity, including a hub and a plurality of vanes emanating from the hub configured to draw dust from the workpiece into the cavity and to direct the dust through the discharge chute. A collet nut is integrated into the hub of the impeller so that the impeller can be directly mounted to the output shaft of the power tool while clamping the collet onto the tool bit.

First claim

What is claimed is:

1. A dust extraction system for a power tool having a output shaft, a collet configured for engaging a tool bit and a collet nut engageable to the output shaft to fasten the collet to the output shaft, said system comprising:
a base configured for mounting on the power tool, said base defining a cavity having an opening for passage of the output shaft therethrough when said base is mounted on the power tool, said base further including a discharge chute in communication with said cavity, said chute having an inlet intersecting said cavity, an outlet outside said base and a discharge passageway between said inlet and said outlet sized for passage of dust produced by operation of the tool bit on a workpiece; and
an impeller sized and configured to be rotatably received within said cavity, said impeller including a hub and a plurality of vanes emanating from said hub, said vanes configured to draw dust from the workpiece into said cavity and to direct dust from said cavity into said discharge chute, said hub defining a bore therethrough sized and configured to removably engage the collet nut so that said impeller rotates with the collet nut and output shaft of the tool.

2. The dust extraction system of claim 1 , further comprising a baffle removably mountable on said base to cover said cavity when said impeller is disposed within said cavity, said baffle defining an intake opening concentric with the output shaft and sized to receive dust and debris drawn into said cavity by operation of said impeller.

3. The dust extraction system of claim 2 , wherein:
said base includes a circumferential wall defining said cavity with said inlet of said discharge chute defined in said wall; and
said base and said baffle are configured so that said baffle is mountable to said base to form an air-tight seal between said baffle and said circumferential wall.

4. The dust extraction system of claim 1 , wherein each of said plurality of vanes emanates radially from said hub.

5. The dust extraction system of claim 4 , wherein each of said plurality of vanes includes an angled portion adjacent said hub and a main portion having a generally constant height from said angled portion to the perimeter of said impeller.

6. The dust extraction system of claim 5 , further comprising a baffle removably mountable on said base to cover said cavity when said impeller is disposed within said cavity, said baffle defining an intake opening concentric with the output shaft and sized to receive dust drawn into said cavity by operation of said impeller.

7. The dust extraction system of claim 1 , wherein said base includes:
a circumferential wall defining said cavity with said inlet of said discharge chute defined in said wall; and
a mounting plate extending from said wall for engagement with the power tool.

8. The dust extraction system of claim 1 , wherein said base includes:
a circumferential wall defining said cavity; and
said discharge chute includes a tubular structure projecting generally tangentially from said circumferential wall with said inlet intersecting said circumferential wall.

9. The dust extraction system of claim 1 , further comprising a receptacle mountable to said discharge chute at said outlet, said receptacle sized to receive dust and debris drawn into said discharge chute by said impeller.

10. The dust extraction system of claim 9 , wherein said receptacle includes a mounting neck configured for engagement with said discharge chute and an opening opposite said mounting neck, said opening covered by a filter permeable to airflow and generally impermeable to dust and debris.

11. The dust extraction system of claim 9 , wherein said receptacle includes a hose connectable between said receptacle and said discharge chute for positioning said receptacle remote from the power tool.

12. The dust extraction system of claim 1 , further comprising:
a receptacle sized to receive dust and debris drawn into said discharge chute by said impeller; and
a hose connectable between said receptacle and said discharge chute for positioning said receptacle remote from the power tool.

13. The dust extraction system of claim 12 , wherein said receptacle includes a clip mounted thereto and adapted for engagement on a belt or waist band.

14. The dust extraction system of claim 1 , further comprising a depth guide adjustably mounted to said base and configured to bear against the workpiece to adjust the depth of introduction of the tool bit into the workpiece.

15. A dust extraction system for a power tool having an output shaft having a threaded portion and a collet configured for engaging a tool bit, said system comprising:
a base configured for mounting on the power tool, said base defining a cavity having an opening for passage of the output shaft therethrough when said base is mounted on the power tool, said base further including a discharge chute in communication with said cavity, said chute having an inlet intersecting said cavity, an outlet outside said base and a discharge passageway between said inlet and said outlet sized for passage of dust produced by operation of the tool bit on a workpiece;
an impeller sized and configured to be rotatably received within said cavity, said impeller including a hub and a plurality of vanes emanating from said hub, said vanes configured to draw dust from the workpiece into said cavity and to direct dust from said cavity into said discharge chute; and
a collet nut integrated into said hub of said impeller and configured to removably engage the threaded portion of the output shaft of the tool so that said impeller rotates with the collet nut and output shaft of the tool.

16. The dust extraction system of claim 15 , wherein said hub defines a bore therethrough and said collet nut is embedded within said bore.

17. The dust extraction system of claim 15 , wherein said hub defines a bore having internal threads to form the collet nut.

18. The dust extraction system of claim 15 , further comprising a baffle removably mountable on said base to cover said cavity when said impeller is disposed within said cavity, said baffle defining an intake opening concentric with the output shaft and sized to receive dust and debris drawn into said cavity by operation of said impeller.

19. The dust extraction system of claim 18 , wherein:
said base includes a circumferential wall defining said cavity with said inlet of said discharge chute defined in said wall; and
said base and said baffle are configured so that said baffle is mountable to said base to form an air-tight seal between said baffle and said circumferential wall.

20. The dust extraction system of claim 15 , wherein said base includes:
a circumferential wall defining said cavity; and
said discharge chute includes a tubular structure projecting generally tangentially from said circumferential wall with said inlet intersecting said circumferential wall.

Assignees

• Rubens Jeremy
• Moreno Jaime
• Martinez Chastity
• Bosch Tool Corp
• Bosch Gmbh Robert

Inventors

• Rubens Jeremy
• Moreno Jaime
• Martinez Chastity

Classifications

• B23Q11/0046 Primary

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