Dust collector for portable rotary disc grinder

• US 3,882,644 A
• Filed: 05/24/1974
• Issued: 05/13/1975
• Est. Priority Date: 06/08/1973
• Status: Expired due to Term

• Current Assignee: Guy F. Cusumano
• Original Assignee: Guy F. Cusumano
• Inventors: Cusumano, Guy F.
• Primary Examiner(s): Kelly, Donald G.
• Application Number:
  US05/473,234
• Time in Patent Office: 354 Days
• Field of Search: 51/17T,17MT,17PT,273
• US Class Current: 451/359
• CPC Class Codes: A47L 11/20 combined with vacuum cleaning devices
• CPC Class Codes: A47L 11/4044 Vacuuming or pick-up tools; Squeegees
• CPC Class Codes: A47L 11/4077 Skirts or splash guards
• CPC Class Codes: B24B 55/102 with rotating tools

Abstract

A dust-extracting device for use in conjunction with a portable rotary flexible disc grinder comprising a truncated circular dust-extracting hood overlying somewhat more than half of the area of the disc and having an arcuate skirt extending downwardly nearly to the plane of the disc, a dust induction chamber formed at the end of the hood skirt toward which the disc turns, and an arcuate duct formed in the upper inner periphery of the hood. The dust induction chamber has mounted thereon a curved scoop positioned to guide air and dust particles toward the dust induction chamber. The device is provided with three series of holes, namely, a first series of holes in the front wall of the induction chamber, a second series of holes in the bottom of the induction chamber and a third series of holes in the bottom of the arcuate duct. The device provides effective dust collection with a relatively high ratio of air induction velocity to total quantity of air flow.

Claims

1. A portable rotary grinder having a body portion, a thin flexible abrasive disc, a drive shaft effectively secured to the center of said disc and extending into said body, motor means within said body connected to rotate said shaft and disc, a truncated circular dust-extracting hood positioned between said disc and body portion and overlying somewhat more than half the area of said disc, said hood including an arcuate skirt extending downwardly nearly to the plane of said disc, an arcuate duct formed at the upper inner periphery of said hood and circumferentially coextensive therewith, a dust induction chamber formed on the outside of the end of said skirt toward which said disc turns and communicating with said duct, said chamber having a front wall with a first series of holes formed therein, a curved scoop secured to the front wall of said chamber and extending in a direction opposite to the direction of rotation of said disc to guide dust particles generated by operation of said grinder toward said first series of holes, the bottom wall of said chamber being provided with a second series of holes, and the bottom wall of said duct being provided with a third series of holes spaced along the length thereof, and a suction conduit connected to said hood near said chamber and communicating with the interiors of said chamber and said duct, whereby dust particles generated during operation of said grinder are drawn through said several series of holes and away from said hood.

2. A portable grinder according to claim 1 wherein said duct and the skirt of said hood subtend an angle of 200* to 270* at the axis of said grinder.

3. A portable grinder according to claim 1 wherein the skirt of said hood has secured thereto an arcuate brush extending downwardly below the plane of said disc.

4. A dust-extracting device adapted to be used in conjunction with a motor-driven, rotary, flexible disc grinder to collect dust formed during operation of said grinder, said dust extracting device comprising a truncated circular dust-extracting hood positioned between said motor and disc and overlying somewhat more than half the area of said disc, said hood including an arcuate skirt extending downwardly nearly to the plane of said disc, a dust induction chamber formed at the end of said skirt toward which said disc turns, said chamber having a front wall with a series of holes formed therein, a curved scoop secured to the front wall of said chamber and extending in a direction opposite to the direction of rotation of said disc to guide dust particles generated by operation of said grinder toward said holes in said chamber front wall, said chamber having a bottom wall with a second series of holes formed therein, and a suction conduit connected to said chamber, whereby air and dust particles formed during operation of said grinder are drawn through said holes and away from said hood.

5. A dust-extracting device adapted to be used in conjunction with a motor-driven, rotary, flexible disc grinder to collect dust formed during operation of said grinder, said dust extracting device comprising a truncated circular dust-extracting hood positioned between said motor and disc and overlying somewhat more than half the area of said disc, said hood including an arcuate skirt extending downwardly nearly to the plane of said disc, an arcuate duct formed at the upper inner periphery of said hood and circumferentially coextensive therewith, said duct having a bottom wall provided with a first series of holes spaced along the length thereof, a dust induction chamber formed on the outside of the end of said skirt toward which said disc turns, said chamber having a front wall with a second series of holes formed therein, a curved scoop secured to the front wall of said chamber and extending in a direction opposite to the direction of rotation of said disc to guide dust particles generated by operation of said grinder toward said holes in said chamber front wall, said chamber having a bottom wall with a third series of holes formed therein, and a suction conduit connected to and communicating with said chamber and duct, whereby air and dust particles formed during operation of said grinder are drawn through said holes and away from said hood.

6. A dust-extracting device according to claim 5 wherein the holes of said first series are of smaller diameter than the holes of said second and third series.

7. A dust-extracting device adapted to be used in conjunction with a motor-driven, rotary, flexible disc grinder to collect dust formed during operation of said grinder, said dust-extracting device comprising a truncated circular dust-extracting hood positioned between said motor and disc and overlying somewhat more than half the area of said disc, said hood including an arcuate skirt extending downwardly nearly to the plane of said disc, an arcuate brush mounted on the skirt of said hood and extending downwardly below the plane of said grinder disc, a dust induction chamber formed on the outside of the end of said skirt toward which said disc turns, said chamber having a front wall with a series of holes formed therein, a curved scoop secured to the front wall of said chamber and extending in a direction opposite to the direction of rotation of said disc to guide dust particles generated by operation of saiD grinder toward said holes in said chamber front wall, said chamber having a bottom wall with a second series of holes formed therein, and a suction conduit connected to said chamber, whereby air and dust particles formed during operation of said sander are drawn through said holes and away from said hood.

8. A dust-extracting device adapted to be used in conjunction with a motor-driven rotary grinder to collect dust formed during operation of said grinder, said dust-extracting device comprising a truncated, circular dust-extracting hood adapted to be positioned between said motor and disc and to overlie said disc, said hood including a dependent arcuate skirt, a dust induction chamber formed at one end of said skirt, said chamber having a front wall substantially perpendicular to said skirt, said wall having a series of holes formed therein and being positioned to receive dust particles generated by operation of said grinder, a scoop mounted on said induction chamber and extending circumferentially of said hood, said scoop being constructed and arranged to guide dust particles generated by operation of said grinder toward said holes in said chamber, and a suction conduit connected to said chamber for drawing air and dust particles formed during operation of said grinder through said chamber and away from said hood.

9. A dust-extracting device according to claim 8 wherein said dust induction chamber has a bottom wall with a second series of holes formed therein.

10. A dust-extracting device according to claim 8 wherein said hood has an arcuate duct formed at the upper inner periphery thereof, said duct having a bottom wall provided with a series of holes spaced along the length thereof.

11. A dust-extracting device according to claim 8 wherein the skirt of said hood subtends an angle of 200* to 270* at the axis of said grinder.

12. A dust-extracting device according to claim 8 wherein said chamber has a rear wall with a hole formed therein through which air is drawn to reduce erosion of said wall by the stream of dust-bearing air passing through said chamber.

13. A dust-extracting device adapted to be used in conjunction with a motor driven rotary grinder to collect dust formed during operation of said grinder, said dust-extracting device comprising a truncated circular dust-extracting hood adapted to be positioned between said motor and disc and to overlie said disc, said hood including a depending arcuate skirt a dust induction chamber formed at one end of said skirt, said chamber having a front wall substantially perpendicular to said skirt, said wall having a series of holes formed therein and being positioned to receive dust particles generated by operation of said grinder, an arcuate brush mounted on the skirt of said hood and extending downwardly therefrom and a suction conduit connected to said chamber for drawing air and dust particles formed during operation of said grinder through said chamber and away from said hood.

14. A dust-extracting device according to claim 13 wherein said arcuate brush is vertically adjustable with respect to the skirt of said hood.