Dust hood for a power tool

Patent metadata

Field	Value
Publication number	US-12115610-B2
Application number	US-202017441143-A
Country	US
Kind code	B2
Filing date	Mar 24, 2020
Priority date	Apr 8, 2019
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

A dust hood for a power tool, wherein the dust hood includes an extraction region in which a suction hose coming from a dust-sucking device opens into the dust hood. The dust hood has a curvature in the extraction region, wherein the curvature makes it possible for an impulse surge which is generated within a filter cleaning operation of a dust-sucking device to be attenuated by reflection.

First claim

What is claimed is:

1. A dust hood for a power tool, the dust hood comprising:
an extraction region where a suction hose coming from a dust-sucking device opens into the dust hood; and
a curvature in the extraction region designed to attenuate an impulse surge coming from the dust-sucking device and conveyed through the suction hose into an inner region of the dust hood;
wherein the curvature is designed so the attenuation produces a counter-impulse to an impulse surge, the counter-impulse preventing a situation in which, in an inner region of the dust hood, a vacuum generated by the dust-sucking device and conveyed by the suction hose breaks down at the time of a filter cleaning;
wherein the curvature is a dent directly opposite an opening of the suction hose: wherein the dust hood has an inner and outer wall, the inner wall having the dent and the outer wall being straight opposite the dent.

2. The dust hood as recited in claim 1 wherein the curvature is defined by a ratio of height to diameter.

3. The dust hood as recited in claim 1 wherein individual wall regions of the dust hood are of double-walled design.

4. The dust hood as recited in claim 1 wherein the dust hood includes an electrically conductive base material.

5. The dust hood as recited in claim 1 wherein an inner region of the dust hood is designed to be homogeneous in terms of flow dynamics without aerodynamic turbulence.

6. The dust hood as recited in claim 1 further comprising a baffle as abrasive wear protection and temperature protection.

7. The dust hood as recited in claim 6 wherein the baffle separates the extraction region from the inner region of the dust hood.

8. The dust hood as recited in claim 1 wherein the outer wall is elastic.

9. The dust hood as recited in claim 8 wherein the outer wall includes plastic.

10. The dust hood as recited in claim 1 wherein the outer wall and the inner wall each have a thickness of from 0.1 mm to 3 mm.

11. The dust hood as recited in claim 10 wherein the thickness is of from 2 mm to 3 mm.

12. The dust hood as recited in claim 10 wherein the outer wall and inner wall define a doubled-wall design having a thickness of at least 5 mm.

13. The dust hood as recited in claim 9 further comprising a baffle, the baffle being made of metal as serving to protect the plastic from flying sparks.

14. The dust hood as recited in claim 13 wherein the inner and outer walls are part of a shell half, the metal grating being wider than the shell half.

Assignees

• Hilti Ag

Inventors

• Huber Franz
• Hanslmeier Xaver

Classifications

• B28D7/02

  for removing or laying dust, e.g. by spraying liquids; for cooling work · CPC title

• B24B55/052

  with rotating tools · CPC title

• B23Q11/0071

  dust collectors for hand tools · CPC title

• B23Q11/0046 Primary

  by sucking · CPC title

• B25F5/02 Primary

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title