# US 2014/0196920 A1 · Power tool having improved operability > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0196920 A1 - Document ID: US20140196920A1 - Status: Published application - Kind: A1 - Application number: 14/152,226 - Filed: 2014-01-10 - Published: 2014-07-17 - Earliest claimed: 2013-01-16 - Assignees: Robert Bosch GmbH - Inventors: Bernd WIRNITZER; Christoph STEURER - Web page: https://patentgrep.com/patent/US20140196920A1 ## CPC - B25F 5/00: Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for - 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)} ## Abstract A power tool includes: a drive unit for a tool; an operating device for activating the power tool; a measuring device for measuring a motion of the power tool; and a filter for filtering at least one measured value of the measured motion. The operating device is configured to reduce a power output of the drive unit when the filtered, measured value corresponds to a state of reduced ease of operation. ## Claims ### Claim 1 A power tool, comprising: a tool unit; a drive unit for the tool unit; an operating device for activating the power tool; a measuring device for measuring a motion of the power tool; at least one filter for filtering at least one measured value of the measured motion; and a control unit configured to at least one of reduce a power output of the drive unit and decelerate the drive unit, when the filtered value of the measured motion reaches a specified comparison value. ### Claim 2 (depends on 1) The power tool as recited in claim 1, wherein the filter is at least one of a low-pass filter and a high-pass filter. ### Claim 3 (depends on 2) The power tool as recited in claim 2, wherein: a storage battery is provided for supplying the drive unit with electrical energy; and a filter characteristic of the filter is a function of the weight of the storage battery. ### Claim 4 (depends on 3) The power tool as recited in claim 3, wherein one of the following is provided in order to set the appropriate filter characteristic: (i) a detection circuit configured to detect a type of the storage battery, or (ii) an input unit for inputting information regarding the type of the storage battery. ### Claim 5 (depends on 2) The power tool as recited in claim 2, wherein: the measuring device includes at least one of an acceleration sensor and a rotation-rate sensor; and at least one of (i) a first filter having a first filter characteristic is provided for filtering the measuring signal of the acceleration sensor, and (ii) a second filter having a second filter characteristic is provided for filtering the measuring signal of the rotation-rate sensor. ### Claim 6 (depends on 5) The power tool as recited in claim 5, wherein an integration unit is provided for integrating at least one of the filtered measuring signal of the acceleration sensor and the filtered measuring signal of the rotation-rate sensor, and wherein the control unit is configured to use the at least one of the integrated measuring signal of the acceleration sensor and the integrated measuring signal of the rotation-rate sensor for detecting a reduction in an ease of operation. ### Claim 7 (depends on 5) The power tool as recited in claim 5, wherein the control unit is configured to detect a reduction in an ease of operation when at least one of the measuring signal of the acceleration sensor and the measuring signal of the rotation-rate sensor reaches a respective specified value. ### Claim 8 (depends on 6) The power tool as recited in claim 6, wherein the control unit is configured to detect a reduction in an ease of operation when the at least one of the integrated measuring signal of the acceleration sensor and the integrated measuring signal of the rotation-rate sensor reaches a respective specified value. ### Claim 9 (depends on 5) The power tool as recited in claim 5, wherein the acceleration sensor is provided for monitoring the motion of the power tool in at least two moving directions of the power tool perpendicular to one another, and wherein the control unit is configured to use the monitored motion of the power tool in the two moving directions for measuring the motion of the power tool. ### Claim 10 (depends on 5) The power tool as recited in claim 5, wherein the specified comparison value is at least one of: a limiting value; a limiting value and a period of time; a characteristic curve function of the motion versus time; and a characteristic curve function of the motion versus a distance. ### Claim 11 A method for operating a power tool having a drive unit for a tool, comprising: measuring a motion of the power tool using at least one measuring signal; filtering the at least one measuring signal; and at least one of (i) reducing a power output of the drive unit and (ii) decelerating the drive unit, when the filtered measuring signal reaches a limiting value which corresponds to a reduction in an ease of operation. ### Claim 12 (depends on 11) The method as recited in claim 11, wherein the drive unit is supplied with electrical energy by a storage battery, and the measuring signal is filtered using a filter characteristic which varies as a function of a weight of the storage battery. ### Claim 13 (depends on 12) The method as recited in claim 12, wherein one of (i) the type of storage battery is detected, or (ii) information regarding the type of storage battery is read in or input, in order to set the appropriate characteristic for the filtering. ### Claim 14 (depends on 12) The method as recited in claim 12, wherein at least one of an acceleration and a rate of rotation of the power tool is measured, the measuring signal of the acceleration is filtered at a first filter characteristic, and the measuring signal of the rate of rotation is filtered at a second filter characteristic. ### Claim 15 (depends on 14) The method as recited in claim 14, wherein the at least one of the filtered measuring signal of the acceleration and the filtered measuring signal of the rate of rotation is integrated with respect to time, and the at least one of the integrated measuring signal of the acceleration and the integrated measuring signal of the rate of rotation is used for detecting a state of reduced ease of operation.