# US 2013/0153255 A1 · Hand-Held Machine Tool

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- Number: US 2013/0153255 A1
- Document ID: US20130153255A1
- Status: Published application
- Kind: A1
- Application number: 13/818,933
- Filed: 2011-07-28
- Published: 2013-06-20
- Earliest claimed: 2010-09-03
- Assignees: Endress + Hauser GmbH + Co. KG
- Inventors: Rudolf Fuchs
- Web page: https://patentgrep.com/patent/US20130153255A1

## CPC

- G01N 29/40: by amplitude filtering, e.g. by applying a threshold {or by gain control}
- B25F 5/006: {Vibration damping means}
- G01F 23/2965: Measuring attenuation of transmitted waves
- G01F 23/2966: {making use of acoustical resonance or standing waves}
- G01F 23/2967: {for discrete levels}
- G01N 9/002: {using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis (G01N9/34 takes precedence)}
- G01N 11/16: by measuring damping effect upon oscillatory body
- G01N 29/022: {Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices (microdevices per se B81B)}
- G01N 29/036: by measuring frequency or resonance of acoustic waves
- G01N 2291/02818: Density, viscosity
- G01N 2291/0427: Flexural waves, plate waves, e.g. Lamb waves, tuning fork, cantilever
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- B25F: COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR {(machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass B23P23/00 and subgroups)}
- G01F: MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME

## Abstract

The disclosure relates to a hand-held machine tool, comprising a drive unit, a gearbox unit, which comprises at least one input shaft and at least one output shaft operatively connected to the input shaft, and a tool holder, which is configured to be driven via the output shaft of the gearbox unit in an oscillating manner about an axis of rotational symmetry of the output shaft. A vibration compensating unit is proposed, which comprises at least one compensating mass which, in order to compensate for a vibration, is driven in at least one operating state against a direction of movement of the tool holder.

## Claims

### Claim 1

A hand power tool comprising:
a drive unit;
a transmission unit including (i) at least one input shaft and (ii) at least one output shaft operatively connected to the input shaft;
a tool receiver configured to be driven in an oscillating manner, via the output shaft of the transmission unit, about a rotational symmetry axis of the output shaft; and
a vibration compensating unit including at least one compensating mass that, in at least one operating state, is configured to be driven contrary to a direction of motion of the tool receiver,
wherein the vibration compensation unit is configured to compensate a vibration.

### Claim 2 (depends on 1)

The hand power tool as claimed in claim 1, wherein the transmission unit includes (i) at least one first cam mechanism configured to drive the tool receiver, and (ii) at least one second cam mechanism configured to drive the compensating mass.

### Claim 3 (depends on 2)

The hand power tool as claimed in claim 2, wherein the first cam mechanism and the second cam mechanism are operatively coupled to the drive unit.

### Claim 4 (depends on 3)

The hand power tool as claimed in claim 3, wherein:
the first cam mechanism includes a first eccentric element disposed on the input shaft, and
the second cam mechanism includes a second eccentric element disposed on the input shaft.

### Claim 5 (depends on 4)

The hand power tool as claimed in claim 4, wherein the first eccentric element and the second eccentric element are offset in relation to each other by at least substantially 180°.

### Claim 6 (depends on 2)

The hand power tool as claimed in claim 2, further comprising:
an angled motion converter configured to operatively connect the compensating mass of the vibration compensating unit to the second cam mechanism.

### Claim 7 (depends on 6)

The hand power tool as claimed in claim 6, wherein the compensating mass of the vibration compensating unit and the angled motion converter are realized in an at least partially integral manner.

### Claim 8 (depends on 1)

The hand power tool as claimed in claim 1, wherein the compensating mass of the vibration compensating unit is rotatably mounted on the output shaft.