Oscillating Tool With Vibration Damping System

• US 20100236806A1
• Filed: 03/18/2010
• Published: 09/23/2010
• Est. Priority Date: 03/18/2009
• Status: Active Grant

• Current Assignee: C.&E. Fein GmbH
• Original Assignee: C.&E. Fein GmbH
• Inventors: Schreiber, Alfred, Heilig, Mark, Blickle, Juergen
• Granted Patent: US 8,397,834 B2
• Time in Patent Office: Days
• US Class Current: 173/217
• CPC Class Codes: B23D 47/005 Vibration-damping
• CPC Class Codes: B24B 23/04 with oscillating grinding tools; Accessories therefor
• CPC Class Codes: B24B 41/007 Weight compensation; Temperature compensation; Vibration damping
• CPC Class Codes: B24B 41/042 Balancing mechanisms
• CPC Class Codes: B25F 5/006 Vibration damping means
• CPC Class Codes: B27B 19/006 with oscillating saw blades; Hand saws with oscillating saw blades

Abstract

An oscillating tool comprises a housing that accommodates a motor which for driving a tool is coupled with a drive shaft via an oscillation drive, for driving it about its longitudinal axis rotatingly oscillatingly. For reducing vibrations, there is provided an inertial mass that is movably held on the housing via at least one spring element.

Claims

1. An oscillating tool comprising:

a housing;

a motor received within said housing;

a drive shaft for driving a tool;

an oscillation drive driven by said motor for driving said drive shaft rotatingly oscillatingly about a longitudinal axis thereof; and

an inertial mass having an annular shape with an opening; and

two leaf springs fixed to said housing and engaging said inertial mass within said opening; and

at least one piezoelectric element engaging said housing and said inertial mass for restricting movement of said inertial mass.

2. The oscillating tool of claim 1, wherein said inertial mass, said leaf springs and said at least one piezoelectric element define a spring-mass system having a resonant frequency that is tuned to an operating frequency of said oscillating tool.

3. An oscillating tool comprising:

a housing;

a motor received within said housing;

a drive shaft for driving a tool;

an oscillation drive driven by said motor for driving said drive shaft rotatingly oscillatingly about a longitudinal axis thereof; and

an inertial mass having an annular shape with an opening; and

at least two spring elements engaging said housing and said opening for suspending said inertial mass movably within said housing.

4. The oscillating tool of claim 3, wherein at least two spring elements engage said opening of said inertial mass.

5. The oscillating tool of claim 3, further comprising means for restricting movement of said inertial mass to one plane only.

6. The oscillating tool of claim 3, wherein said at least one spring element is configured as a leaf spring.

7. The oscillating tool of claim 3, wherein said oscillation drive comprises an eccentric shaft that is surrounded by said inertial mass.

8. The oscillating tool of claim 3, wherein said motor comprises a motor shaft that is surrounded by said inertial mass.

9. The oscillating tool of claim 3, wherein said motor has a first end facing said tool and a second end opposite said tool, and wherein said inertial mass is arranged on said second end of said motor.

10. The oscillating tool of claim 3, wherein said spring element has a variable spring characteristic.

11. The oscillating tool of claim 10, further comprising a piezoelectric element for varying said spring characteristic of said spring element.

12. The oscillating tool of claim 3, further comprising a damping means for damping movement of said spring element.

13. The oscillating tool of any of claim 3, comprising a plurality of inertial masses engaging said housing.

14. The oscillating tool of claim 13, wherein said inertial masses are tuned to different resonant frequencies.

15. The oscillating tool of claim 13, wherein said inertial masses are arranged within said housing one beside the other.

16. The oscillating tool of claim 3, wherein said inertial mass and said at least one spring element define a spring-mass system having a resonant frequency that is tuned to an operating frequency of said oscillating tool.

17. The oscillating tool of claim 16, further comprising a vibration sensor that is coupled to said at least one spring element for effecting adaptation of said resonant frequency of said spring-mass system to the resonant frequency of said oscillating tool during operation.

20. The oscillating tool of claim 17, wherein said inertial mass and at least one spring element define a spring-mass system having a resonant frequency that is tuned to an operating frequency of said oscillating tool.

18. An oscillating tool comprising:

a housing;

a motor received within said housing;

a drive shaft for driving a tool;

an oscillation drive driven by said motor for driving said drive shaft rotatingly oscillatingly about a longitudinal axis thereof; and

an inertial mass movably held within said housing by at least one spring element.

19. The oscillating tool of claim 18, wherein said inertial mass has an annular shape with an opening wherein at least one spring element engages said inertial mass.