Hand-held power tool with damping system

• US 20060289183A1
• Filed: 06/21/2006
• Published: 12/28/2006
• Est. Priority Date: 06/24/2005
• Status: Abandoned Application

• Current Assignee: C.&E. Fein GmbH
• Original Assignee: C.&E. Fein GmbH
• Inventors: Schreiber, Alfred
• Application Number:
  US11/471,837
• Publication Number:
  US 20060289183A1
• Time in Patent Office: Days
• US Class Current: 173/162.200
• CPC Class Codes: B25D 17/043 Handles resiliently mounted relative to the hammer housing B25D17/046 takes precedence
• CPC Class Codes: B25D 17/24 Damping the reaction force resiliently mounted handles B25D17/043; dampers in connections of hammers to backhoes E02F3/966
• CPC Class Codes: B25D 2250/221 Sensors
• CPC Class Codes: B25F 5/006 Vibration damping means
• CPC Class Codes: B25F 5/02 Construction of casings, bodies or handles B25F5/006, B25F5/008 take precedence

Abstract

A hand-held power tool, in particular an electric tool is disclosed, comprising a housing in which a motor is received for driving a tool, further comprising a damping system for actively influencing the vibration behavior, wherein the damping system comprises at least one damping element and a sensor that emits an electric sensor signal when deformation occurs, which signal is supplied to an electric circuit that generates therefrom a control signal which is supplied to an actor at a given phase angle relative to the sensor signal.

Claims

1. A hand-held power tool, comprising:

a housing;

a motor received within said housing for driving a tool;

a damping system for actively influencing vibrations emerging from said power tool, said damping system comprising

at least one damping element having a sensor emitting an electric sensor signal in response to a deformation caused by vibrations of said power tool;

an electric circuit into which said electric sensor signal is fed for generating a control signal in response thereto; and

an actor driven by said control signal at a given phase shift relative to said sensor signal.

2. The hand-held power tool as defined in claim 1, wherein the damping system comprises at least one element selected from the group formed by a piezoelectric transducer element, a piezomagnetic transducer element, a antiferroelectric transducer element, an electrostatic transducer element, a magnetostrictive transducer element, a deformation memory transducer element and a nanotube transducer.

4. The hand-held power tool as defined in claim 1, wherein the electric circuit is configured for deriving from said sensor signal a value characteristic of vibrations of said hand tool, and further comprises a memory for storing said characteristic value.

5. The hand-held power tool as defined in claim 1, wherein said electric circuit is configured for deriving from said sensor signal a phase-shifted control signal that is timed ahead of said sensor signal.

6. The hand-held power tool as defined in claim 1, wherein said electric circuit comprises a microprocessor controlled by a self-learning software algorithm processing a signal sequence generated by said sensor signal within a given time frame for generating a control signal fed to said actor for reducing vibrations.

7. The hand-held power tool as defined in claim 1, wherein an actor is received in at least one area of said housing, the area being selected to locally influence a stiffness of said housing selectively.

8. The hand-held power tool as defined in claim 1, wherein at least one actor is configured in strip-like shape.

9. The hand-held power tool as defined in claim 1, wherein at least one sensor is configured in strip-like shape.

12. The hand-held power tool of claim 1, wherein said motor further comprises an armature held within armature bearings received within said housing in selected regions, wherein at least one actor is arranged in close relation to said selected regions.

13. The hand-held power tool as defined in claim 1, wherein said housing comprises an inner side and an outer side, and wherein at least one actor is received on said inner side and at least one actor is received on said outer side of said housing.

14. The hand-held power tool as defined in claim 1, wherein said housing comprises a web, whereon at least one actor is received.

15. The hand-held power tool as defined in claim 1, wherein said electric circuit comprises means for generating electric energy for operating said electric circuit from vibration energy to which said hand-held power tool is exposed.

16. The hand-held power tool as defined in claim 1, wherein said housing is configured as a pistol housing comprising an elongated housing element, wherein said motor is received, and further comprises a pistol grip attached to a transition region formed between said elongated housing element and said pistol grip, wherein at least one actor is arranged within said transition region.

17. The hand-held power tool as defined in claim 1, wherein said housing is configured as a pistol housing comprising a pistol grip attached to an elongated housing element, wherein said motor and a gearbox are received within a transition region being formed between said motor and said gearbox, and wherein at least one actor is arranged in the transition region between said motor and said gearbox.

18. The hand-held power tool as defined in claim 1, wherein said housing is configured as a bar shaped housing having an elongated housing element, wherein said motor is received, and further comprises a gearhead attached to said elongated housing element and within which a gearbox is received, wherein a joint region is formed between said gearhead and said elongated housing element, and wherein at least one actor is arranged within said joint region.

19. The hand-held power tool as defined in claim 1, wherein said housing is configured as a bar shaped housing having an elongated housing element, wherein said motor is received, and further comprises a gearhead attached to said elongated housing element and within which a gearbox is received, wherein at least one actor is located on said elongated housing element in an end region of said motor opposite said gearhead.

20. The hand-held power tool as defined in claim 1, wherein said housing comprises a main housing element and a grip connected to said main housing element via webs, wherein at least one actor is attached to one of said webs.

3. A hand-held power tool, comprising:

a housing;

a motor received within said housing for driving a tool;

a damping system for actively influencing vibrations emerging from said power tool, said damping system comprising

at least one damping element having a sensor emitting an electric sensor signal in response to a deformation caused by vibrations of said power tool;

an electric circuit into which said electric sensor signal is fed for generating a control signal in response thereto; and

an actor comprising at least one nanotube element driven by said control signal at a given phase shift relative to said sensor signal.

10. A hand-held power tool, comprising:

a housing;

a motor received within said housing for driving a tool;

a damping system for actively influencing vibrations emerging from said power tool, said damping system comprising

at least one damping element having a sensor emitting an electric sensor signal in response to a deformation caused by vibrations of said power tool;

an electric circuit into which said electric sensor signal is fed for generating a control signal in response thereto;

an actor driven by said control signal at a given phase shift relative to said sensor signal; and

at least two functional elements selected from the group formed by a motor unit, a gear unit and a grip unit, said two functional elements being connected to each other by a joint area, wherein at least one actor and at least one sensor are arranged in said joint area.

11. The hand-held power tool as defined in claim 10, wherein said housing comprises a web, whereon at least one actor is received.