Dust collection device for sanding tool

• US 8,721,402 B2
• Filed: 12/23/2008
• Issued: 05/13/2014
• Est. Priority Date: 12/27/2007
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Woo, Edward J., Angadjivand, Seyed A., Wang, Wenli, Reed, John F.
• Primary Examiner(s): Hail, Joseph J
• Assistant Examiner(s): Carlson, Marc
• Application Number:
  US12/810,247
• Publication Number:
  US 20100285728A1
• Time in Patent Office: 1,967 Days
• Field of Search: 451/344, 451/354, 451/355, 451/356, 451/357, 451/358, 451/359, 451/453, 451/456, 96/69, 553/82, 553/85, 554/86, 55D/IG.39, 55D/IG.2, 153/47, 153/30, 15D/IG.8
• US Class Current: 451/453
• CPC Class Codes: B01D 2239/0435 Electret apparatus incorporating such gas filtering material B01D46/0032
• CPC Class Codes: B01D 2239/065 More than one layer present in the filtering material apparatus incorporating such gas filtering material B01D2275/10
• CPC Class Codes: B01D 2275/10 Multiple layers
• CPC Class Codes: B01D 39/1623 of synthetic origin
• CPC Class Codes: B01D 46/0032 using electrostatic forces to remove particles, e.g. electret filters
• CPC Class Codes: B01D 46/02 Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
• CPC Class Codes: B24B 55/10 specially designed for portable grinding machines, e.g. hand-guided

Abstract

A dust collection device for a sanding tool includes a bag having a sidewall with an inner surface and a coupler attached to the bag. The sidewall comprises at least one filter layer and an outer support layer. A sleeve having an outer surface, a sleeve sidewall, a first end, a second end, and at least one gap at either the first end or the second end is positioned within the bag. The sleeve'"'"'s first end is positioned adjacent the coupler to direct incoming air towards the sleeve and the sleeve is positioned within the bag such that a bypass volume is present between the outer surface and the inner surface.

Claims

1. A product comprising:

a dust collection device for a sanding tool comprising a bag having a sidewall with an inner surface and a coupler attached to the bag;

the sidewall comprising at least one filter layer and an outer support layer;

a sleeve having an outer surface, a sleeve sidewall with an inner surface, a first open end, a second open end, a first gap having a first gap area with an air flow path located at the first open end between the sleeve first open end and both the coupler and the inner surface of the bag and a second gap having a second gap area with an air flow path located at the second open end between the sleeve second open end and the inner surface of the bag;

the sleeve constructed from a porous air permeable material; and

the first open end positioned surrounding the coupler to direct incoming air through the sleeve and the sleeve apportioning more airflow through the first gap and the second gap as the permeability of the sleeve is reduced, and the sleeve is sized and positioned within the bag such that an air flow bypass volume is present between the outer surface and the inner surface.

2. The product of claim 1 wherein the sidewall comprises a first filter layer, a second filter layer, and the outer support layer.

3. The product of claim 2 wherein the first filter layer comprises electrostatically charged electret fibers.

4. The product of claim 3 wherein the second filter layer comprises a melt blown microfiber web.

5. The product of claim 2 wherein the second filter layer comprises a melt blown microfiber web.

6. The product of claim 2, 3, 4, or 5 comprising the first filter layer having a total pressure drop at a flow rate of 85 liters/min between about 1.0 to about 4.0 mm H₂O, and the first filter layer having a total basis weight between about 100 to about 300 grams/m²;

and the second filter layer having a total pressure drop at a flow rate of 85 liters/min between about 10 to about 18 mm H₂0, and the second filter layer having a total basis weight between about 25 to about 75 grams/m².

7. The product of claim 2, 3, 4, or 5 comprising the first filter layer having a total pressure drop at a flow rate of 85 liters/min between about 0.1 to about 4.0 mm H₂O, and the first filter layer having a total basis weight between about 50 to about 450 grams/m²;

and the second filter layer having a total pressure drop at a flow rate of 85 liters/min between about 5.5 to about 20 mm H₂0, and the second filter layer having a total basis weight between about 15 to about 75 grams/m².

8. The product of claim 1 wherein the sleeve comprises a nonwoven material.

9. The product of claim 1 wherein the sleeve comprises a pleated material.

10. The product of claim 1 wherein the sleeve sidewall comprises a total pressure drop at a flow rate of 85 liters/min between about 0.05 mm H₂O to about 5.0 mm H₂O.

11. The product of claim 10 wherein the sleeve sidewall comprises a total pressure drop at a flow rate of 85 liters/min between about 0.15 mm H₂O to about 0.8 mm H₂O.

12. The product of claim 1 wherein the sleeve sidewall comprises a total basis weight between about 10 to about 400 grams/m².

13. The product of claim 12 wherein the sleeve sidewall comprises a total basis weight between about 40 to about 250 grams/m².

14. The product of claim 1 wherein the first gap area plus the second gap area is between about 5 cm² to about 160 cm².

15. The product of claim 1 wherein the first gap area plus the second gap area is between about 1 cm² to about 1240 cm².

16. The product of claim 1 wherein the first gap area plus the second gap area is between about 5 cm² to about 600 cm².

17. The product of claim 1 wherein the first gap area plus the second gap area is between about 75 cm² to about 90 cm².

18. The product of claim 1 wherein the first gap area plus the second gap area is between about 75 cm² to about 400 cm².

19. The product of claim 1 wherein the bag has an area, AB, and the sleeve has an area, AS, and an Area Ratio AS/AB is between about 0.2 to about 0.8.

20. The product of claim 19 wherein the Area Ratio AS/AB is between about 0.4 to about 0.6.

21. The product of claim 1 wherein the coupler comprises a barbed first end, a flange, and a ribbed second end, and the flange is attached to the sidewall such that the ribbed second end resides inside of the first end of the sleeve.