초록 ▼

There is also provided a dust extraction module for use with a power tool, the dust extraction module having: a dust collection chamber (50) having an inlet (52) connectable in fluid communication with an outlet (44) of a dust-extracting duct (40) of the power tool, and having an outlet (54) in flui

There is also provided a dust extraction module for use with a power tool, the dust extraction module having: a dust collection chamber (50) having an inlet (52) connectable in fluid communication with an outlet (44) of a dust-extracting duct (40) of the power tool, and having an outlet (54) in fluid communication with atmospheric air; and a filter (60) locatable in fluid flow between the outlet of the dust collection chamber and the atmospheric air; wherein the dust collection chamber (50) has a substantially circular cross section, the inlet (52) to the dust collection chamber is at the perimeter of the circle and the outlet (54) of the dust collection chamber is from the middle of the circle.

대표청구항 ▼

I claim: 1. A power tool comprising: a working head for holding a working element; a duct having an inlet locatable in proximity to a point of contact between the working element and a workpiece; a dust collection chamber having an inlet in fluid communication with an outlet from said duct and an o

I claim: 1. A power tool comprising: a working head for holding a working element; a duct having an inlet locatable in proximity to a point of contact between the working element and a workpiece; a dust collection chamber having an inlet in fluid communication with an outlet from said duct and an outlet in fluid communication with atmospheric air; a fan operable to transport air from the inlet of said duct to the outlet from said duct; and a filter fluidly connected between the outlet of said dust collection chamber and atmospheric air; and, wherein the dust collection chamber has a substantially circular cross section, the inlet to said dust collection chamber is at a perimeter of said dust collection chamber and the outlet of said dust collection chamber is proximate a middle of said dust collection chamber, wherein the cross section of the outlet of the dust collection chamber is larger than the combined cross section of through-holes in the working head. 2. A power tool according to claim 1, wherein the cross-sectional area of the inlet to the dust collection chamber is greater than or equal to the cross-sectional area of the inlet to the duct. 3. A power tool according to claim 1, wherein the cross-sectional area of the outlet from the dust collection chamber is greater than or equal to the cross-sectional area of the inlet thereto. 4. A power tool according to any one of claim 1, wherein the cross-sectional area of the outlet from the dust collection chamber is greater than or equal to the cross-sectional area of the inlet to the duct. 5. A power tool according to claim 1, wherein the inlet of the dust collection chamber is located above a horizontal plane, wherein at least two-thirds of the interior volume of the dust collection chamber is above the plane. 6. A power tool according to claim 1, wherein the exterior of the dust collection chamber is substantially symmetrical about a vertical plane containing the longitudinal axis of the power tool, such that the power tool is usable by at least one of a left and right handed person. 7. A power tool according to claim 1, wherein the dust collection chamber is detachable from the power tool, the outlet of the duct and the inlet to the dust collection chamber have complementary asymmetric profiles, and the dust collection chamber is attachable to the outlet of the duct in only one possible configuration. 8. A power tool according to claim 1, wherein the exterior of the dust collection chamber is asymmetric about a vertical plane containing the longitudinal axis of the power tool, the dust collection chamber being detachable from the power tool, and the dust collection chamber being attachable to the outlet of the duct in at least one of two possible configurations, wherein one of at least two configurations being for use of the power tool by a left-handed person, and wherein one of at least two configurations being for use of the power tool by a right-handed person. 9. A power tool according to claim 1, wherein the duct is contained within a handle of the power tool. 10. A power tool according to claim 1, wherein the dust collection chamber is provided with at least one of the following group consisting of an anti-static coating, an anti-conductive coating, and an earthing wire. 11. A power tool according to claim 1, wherein the dust collection chamber is at least partially transparent. 12. A power tool according to claim 11, wherein the dust collection chamber is at least partially made of polypropylene. 13. A power tool according to claim 11, wherein the dust collection chamber is at least partially made of glass-filled nylon. 14. A power tool according to claim 1, wherein the dust collection chamber comprises at least one of a door and lid. 15. A power tool according to claim 1, wherein the filter is removable from the dust collection chamber. 16. A power tool according to claim 1, wherein the filter is constructed from at least one of the group consisting of a fabric filter, a pleated filter, and a mesh. 17. A power tool according to claim 1, wherein the filter comprises a first filter element for filtering course dust and a second filter element for filtering finer dust than the first filter element. 18. A power tool according to claim 1, wherein the dust collection chamber is substantially in the shape of a cylinder having a longitudinal axis oriented substantially horizontally with respect to the power tool, the inlet to said dust collection chamber is located on a curved surface of said cylinder, and the outlet of said dust collection chamber is located on an end face of said cylinder. 19. A power tool according to claim 18, wherein the filter is located centrally within the dust collection chamber coaxially with said axis of the dust collection chamber. 20. A power tool according to claim 1, wherein the dust collection chamber is substantially in the shape of a drum having an axis of rotational symmetry oriented substantially vertically with respect to the power tool, the inlet to said dust collection chamber is located on a curved surface of said drum, and the outlet of said dust collection chamber is located on the upper face of said drum. 21. A power tool according to claim 20, wherein the filter is located centrally within the dust collection chamber coaxially with said axis of the dust collection chamber. 22. A power tool according to claim 18, wherein the dust collection chamber contains a second smaller cylinder, the second smaller cylinder has the same orientation as and is coaxial with the first said cylinder, the second cylinder is open at one end thereof to the interior of the dust collection chamber and at the other end thereof provides the outlet from the dust collection chamber, and the filter is located across or around said outlet. 23. A power tool according to claim 20, wherein the dust collection chamber contains a second smaller drum, the second smaller drum has the same orientation as and is coaxial with the first said drum, the second drum is open on the lower face thereof to the interior of the dust collection chamber and on the upper face thereof provides the outlet from the dust collection chamber, and the filter is located across or around said outlet. 24. A power tool according to claim 1, wherein the fan is located on a drive shaft of a motor of the power tool, wherein said motor provides power for the working head of the power tool. 25. A power tool according to claim 24, wherein the drive shaft carries a second fan operable to cool said motor, said second fan being contained in a chamber of said power tool which is sealed from fluid communication with said duct. 26. A power tool according to claim 1, wherein the power tool is a sander, the working head is a platten and the working element is a sheet of sandpaper. 27. A power tool according to claim 1, wherein the power tool is an angle grinder. the working head is a spindle and the working element is at least one of a grinding wheel or disc. 28. A dust extraction module for use with a power tool, said dust extraction module comprising: a dust collection chamber having an inlet connectable in fluid communication with an outlet of a dust-extracting duct of said power tool, and having an outlet in fluid communication with atmospheric air; and a filter locatable in fluid flow between the outlet of said dust collection chamber and said atmospheric air; wherein the dust collection chamber has a substantially circular cross section, the inlet to said dust collection chamber is at a perimeter of said dust collection chamber and the outlet of said dust collection chamber is from a center of said dust collection chamber, wherein the cross section of the outlet of the dust collection chamber is larger than the combined cross section of through-holes in a working head. 29. A dust extraction module according to claim 28, wherein the cross-sectional area of the outlet from the dust collection chamber is greater than or equal to the cross-sectional area of the inlet thereto. 30. A dust extraction module according to claim 28, wherein the inlet to the dust collection chamber is located above a horizontal plane having at least two-thirds of the interior volume of the dust collection chamber above the plane. 31. A dust extraction module according to claim 28, wherein the inlet to the dust collection chamber has an asymmetric profile or has a profile with rotational symmetry of 180 degrees. 32. A dust extraction module according to claim 28, wherein the dust collection chamber is provided with at least one of an anti-static material, an anti-conductive coating, and an earthing wire. 33. A dust extraction module according to one of claim 28, wherein the dust collection chamber is at least partially transparent. 34. A dust extraction module according to claim 33, wherein the transparent dust collection chamber is made of polypropylene. 35. A dust extraction module according to claim 28, wherein the dust collection chamber is at least partially made of glass-filled nylon. 36. A dust extraction module according to claim 28, wherein the dust collection chamber comprises at least one of a door and a lid. 37. A dust extraction module according to claim 28, wherein the filter is removable from the dust collection chamber. 38. A dust extraction module according to claim 28, wherein the filter is at least one of a fabric filter, a pleated filter and a mesh material. 39. A dust extraction module according to claim 28, wherein the filter comprises a first filter element for filtering course dust and a second filter element for filtering finer dust than the first filter element. 40. A dust extraction module according to claim 28, wherein the dust collection chamber is substantially in the shape of a cylinder having a longitudinal axis, the inlet to said dust collection chamber is located on a curved surface of said cylinder, and the outlet of said dust collection chamber is located on an end face of said cylinder. 41. A dust extraction module according to claim 40, wherein the filter is located centrally within the dust collection chamber coaxially with said axis of the dust collection chamber. 42. A dust extraction module according to claim 28, wherein the dust collection chamber is substantially in the shape of a drum having an axis of rotational symmetry, the inlet to said dust collection chamber is located on a curved surface of said drum, and the outlet of said dust collection chamber is located on a face of said drum. 43. A dust extraction module according to claim 42, wherein the filter is located centrally within the dust collection chamber coaxially with said axis of the dust collection chamber. 44. A dust extraction module according to claim 40, wherein the dust collection chamber contains a second smaller cylinder, the second smaller cylinder has the same orientation as and is coaxial with the first said cylinder, the second cylinder is open at one end thereof to the interior of the dust collection chamber and at the other end thereof provides the outlet from the dust collection chamber, and the filter is located across or around said outlet. 45. A dust extraction module according to claim 42, wherein the dust collection chamber contains a second smaller drum, the second smaller drum has the same orientation as and is coaxial with the first said drum, the second drum is open on one face thereof to the interior of the dust collection chamber and on the other face thereof provides the outlet from the dust collection chamber, and the filter is located across or around said outlet.