Guard for an intake channel or blow channel of a power tool and power tool with such a guard

Patent metadata

Field	Value
Publication number	US-12196222-B2
Application number	US-202217592614-A
Country	US
Kind code	B2
Filing date	Feb 4, 2022
Priority date	Feb 12, 2021
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A guard for an intake channel or blow channel of a power tool has a first rib with a longitudinal direction, wherein the first rib has a first rib section that extends along the longitudinal direction of the first rib from a first end to a second end of the first rib section. The first rib section has an inherent frequency. One or more first disruptive bodies are arranged on the first rib section between the first end and the second end of the first rib section. The first disruptive bodies are configured to translatorily vibrate together with the first rib section. The first rib section and the one or more first disruptive bodies form a vibration system with a system inherent frequency, wherein the inherent frequency of the first rib section is different from the system inherent frequency.

First claim

What is claimed is:

1. A guard for an intake channel or blow channel of a power tool, the guard comprising:
a first rib comprising a longitudinal direction, wherein the first rib comprises a first rib section, wherein the first rib section extends along the longitudinal direction of the first rib from a first end of the first rib section to a second end of the first rib section, wherein the first rib section, considered by itself, comprises an inherent frequency;
one or more first disruptive bodies arranged on the first rib section between the first end of the first rib section and the second end of the first rib section, wherein the one or more first disruptive bodies are configured to translatorily vibrate together with the first rib section;
wherein the first rib section and the one or more first disruptive bodies form a vibration system with a system inherent frequency, wherein the inherent frequency of the first rib section is different from the system inherent frequency.

2. The guard according to claim 1 , wherein the guard is embodied as a guard grid and comprises a second rib, wherein the first rib and the second rib intersect each other at a connection point.

3. The guard according to claim 2 , wherein the second rib is oriented transversely to the first rib.

4. The guard according to claim 2 , wherein the second rib is oriented orthogonally to the first rib.

5. The guard according to claim 2 , wherein the first rib is divided at the connection point into the first rib section and into a second rib section, wherein the second rib is divided at the connection point into a top rib section and into a bottom rib section.

6. The guard according to claim 5 , wherein one or more of the rib sections selected from the group consisting of the second rib section, the top rib section, and the bottom rib section each comprise one or more second disruptive bodies, respectively.

7. The guard according to claim 6 , wherein the one or more first disruptive bodies and the one or more second disruptive bodies comprise different masses, respectively.

8. The guard according to claim 6 , wherein a mass of the one or more second disruptive bodies connected to the second rib section amounts to at least 2% of a mass of the first rib.

9. The guard according to claim 6 , wherein a mass of the one or more second disruptive bodies connected to the bottom rib section or to the top rib section amounts to at least 2% of a mass of the second rib.

10. The guard according to claim 6 , wherein the one or more second disruptive bodies extend in a length direction and are rounded aerodynamically.

11. The guard according to claim 6 , wherein the one or more second disruptive bodies and the first rib or the second rib, respectively, are configured together as one piece.

12. The guard according to claim 6 , wherein the one or more second disruptive bodies and the first rib or the second rib, respectively, are comprised of the same material.

13. The guard according to claim 6 , wherein the second rib section comprises one or more of the second disruptive bodies.

14. The guard according to claim 13 , wherein a number of the one or more first disruptive bodies of the first rib section is different from a number of the one or more second disruptive bodies of the second rib section.

15. The guard according to claim 13 , wherein the one or more first disruptive bodies of the first rib section and the one or more second disruptive bodies of the second rib section are arranged asymmetrically to each other in relation to a plane extending through the connection point and arranged orthogonally to the first rib.

16. The guard according to claim 13 , wherein the first rib comprises a top side and a bottom side, wherein the one or more first disruptive bodies of the first rib section are arranged on the top side of the first rib and the one or more second disruptive bodies of the second rib section are arranged on the bottom side of the first rib.

17. The guard according to claim 16 , wherein the one or more first disruptive bodies and the one or more second disruptive bodies of the second rib section are arranged within the first rib in a viewing direction onto the top side of the first rib.

18. The guard according to claim 6 , wherein the top rib section and the bottom rib section each comprises one or more of the second disruptive bodies.

19. The guard according to claim 18 , wherein a number of the one or more second disruptive bodies of the top rib section is different form a number of the one or more second disruptive bodies of the bottom rib section.

20. The guard according to claim 18 , wherein the one or more second disruptive bodies of the bottom rib section and the one or more second disruptive bodies of the top rib section are arranged asymmetrically to each other in relation to a plane extending through the connection point and arranged orthogonally to the second rib.

21. The guard according to claim 18 , wherein the second rib comprises a top side and a bottom side, wherein the one or more second disruptive bodies of the bottom rib section are arranged on the top side of the second rib and the one or more second disruptive bodies of the top rib section are arranged on the bottom side of the second rib, or the one or more second disruptive bodies of the top rib section are arranged on the top side of the second rib and the one or more second disruptive bodies of the bottom rib section are arranged on the bottom side of the second rib.

22. The guard according to claim 21 , wherein the one or more second disruptive bodies of the bottom rib section and the one or more second disruptive bodies of the top rib section are arranged within the second rib in a viewing direction onto the top side of the second rib.

23. The guard according to claim 1 , wherein a mass of the one or more first disruptive bodies amounts to at least 2% of a mass of the first rib.

24. The guard according to claim 1 , wherein the one or more first disruptive bodies extend in a length direction and are rounded aerodynamically.

25. The guard according to claim 1 , wherein the one or more first disruptive bodies and the first rib are configured together as one piece.

26. The guard according to claim 1 , wherein the one or more first disruptive bodies and the first rib are comprised of the same material.

27. A power tool comprising a guard according to claim 1 .

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Seiz Jonathan
• Junker Sebastian

Classifications

• F04D29/667

  by influencing the flow pattern, e.g. suppression of turbulence · CPC title

• B65G53/50 Primary

  Pneumatic devices (incorporated in nozzles B65G53/42) · CPC title

• B65G2201/04

  Bulk · CPC title

• B65G53/24

  Gas suction systems · CPC title

• F04D29/703

  specially for fans, e.g. fan guards · CPC title