# US 11,897,113 B2 · Hand held power tool with a human machine interface > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,897,113 B2 - Document ID: US11897113B2 - Status: Granted - Kind: B2 - Application number: 17/252,039 - Filed: 2019-06-25 - Published: 2021-08-19 - Granted: 2024-02-13 - Earliest claimed: 2018-07-11 - Assignees: Husqvarna AB - Applicants: Husqvarna AB - Inventors: Tobias Nyberg; Christian Bylund; Henric Isén; Martin Larsén; Pär-Ola Svensson; Stefan Stark - Web page: https://patentgrep.com/patent/US11897113B2 ## CPC - A01G 3/033: having motor-driven blades - B25F 5/02: Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} - A01G 3/062: {Motor-driven edge trimmers} - A01G 3/067: {Motor-driven shears for lawns} - A01G 3/085: {Motor-driven saws for pruning or branching} - B25F 5/00: Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for - H03K 17/97: using a magnetic movable element - A01D 34/416: Flexible line cutters - A01D 34/90: for carrying by the operator - A01G 3/053: motor-driven - A01G 20/47: Vacuum or blower devices - B23D 45/16: Hand-held sawing devices with circular saw blades - B23D 57/023: {hand-held or hand-operated} - B25F 3/00: Associations of tools for different working operations with one portable power-drive means; Adapters therefor - A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12) - 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)} - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) - A01D: HARVESTING; MOWING - B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q) ## Abstract A power tool (1) is disclosed comprising a tool (3), a power source (5) arranged to power the tool (3), a throttle lever (7), a circuit board (9), and a human machine interface (10) comprising components (15, 17, 19) arranged on the circuit board (9). The power tool (1) further comprises a magnet (11) operably connected to the throttle lever (7), and a sensor arrangement (13) configured to sense the intensity of the magnetic field of the magnet (11). The sensor arrangement (13) is arranged on the circuit board (9). ## Claims ### Claim 1 A power tool comprising: a tool implement, an elongated body defining a longitudinal axis, a first handle portion attached to the elongated body at a first position along the longitudinal axis, a power source arranged to power the tool implement, a second handle portion attached to the elongated body at a second position along the longitudinal axis and comprising a throttle lever, wherein the first position is closer to the tool implement along the longitudinal axis than the second position, a circuit board located in a sealed enclosure, a human machine interface comprising components arranged on and adjacent a first side of the circuit board, a magnet operably connected to the throttle lever, wherein the magnet is moveably arranged along an arc in response to a displacement of the throttle lever, and a sensor arrangement configured to sense an intensity of a magnetic field of the magnet, wherein the sensor arrangement is arranged on and adjacent a second side of the circuit board, wherein the sensor arrangement comprises at least two sensors each configured to sense the intensity of the magnetic field of the magnet along a different sensing direction, wherein the magnet is located outside of the sealed enclosure. ### Claim 2 (depends on 1) The power tool according to claim 1, wherein the magnet is arranged at a distance from the circuit board on the second side of the circuit board. ### Claim 3 (depends on 1) The power tool according to claim 1, wherein the sensor arrangement senses the intensity of the magnetic field of the magnet along a first sensing direction and along a second sensing direction, and wherein the second sensing direction is different from the first sensing direction, wherein the sensor arrangement is arranged in a first plane, and the first sensing direction extends in a direction substantially coinciding with a direction of a travel path of the magnet, and wherein the circuit board extends in a second plane, and wherein the second sensing direction extends through the second plane. ### Claim 4 (depends on 1) The power tool according to claim 1, wherein the components of the human machine interface comprise one or more buttons, a key pad, or a display. ### Claim 5 (depends on 1) The power tool according to claim 1, wherein the throttle lever is displaceable between an unactuated position and an actuated position, and wherein the power tool comprises a mechanical switch configured to generate a signal when the throttle lever is displaced from the unactuated position. ### Claim 6 (depends on 1) The power tool according to claim 1, wherein the throttle lever is displaceable between an unactuated position and an actuated position, and wherein the magnet and the sensor arrangement are arranged such that the magnetic field of the magnet, at the position of the sensor arrangement and in at least one sensing direction of the sensor arrangement, changes an angle of the magnetic field of the magnet upon a displacement of the throttle lever from the unactuated position towards the actuated position. ### Claim 7 (depends on 6) The power tool according to claim 6, wherein the actuated position is a fully actuated position, and wherein the magnet and the sensor arrangement are arranged such that the magnetic field of the magnet, at the position of the sensor arrangement and in at least one sensing direction of the sensor arrangement, changes an angle of the magnetic field of the magnet when the throttle lever is displaced a distance within the range of 5%-20% of a full travel length of the throttle lever between the unactuated position and the actuated position. ### Claim 8 (depends on 1) The power tool according to claim 1, wherein the magnet is movably arranged in a moving direction between a first and a second end point, and wherein the length of the magnet, in the moving direction, is within the range of 50%-300% of a moving distance of the magnet between the first and second end points. ### Claim 9 (depends on 1) The power tool according to claim 1, wherein the circuit board extends in a second plane and the magnet is movably arranged in a third plane, and wherein the third plane is substantially parallel to the second plane, and wherein the magnet is movably arranged along the arc. ### Claim 10 (depends on 1) The power tool according to claim 1, wherein the magnet is movably arranged between a first and a second end point, and wherein the power tool comprises a spring arranged to bias the magnet towards the first endpoint. ### Claim 11 (depends on 1) The power tool according to claim 1, wherein the sensor arrangement comprises at least two sensors each configured to sense the intensity of the magnetic field of the magnet, and wherein the magnet is movably arranged along a travel path, and wherein the at least two sensors are arranged in a first plane substantially perpendicular to the travel path. ### Claim 12 (depends on 11) The power tool according to claim 11, wherein the angle between two sensors of the at least two sensors, measured in the first plane at a point coinciding with the travel path of the magnet, is approximately 90 degrees, or wherein the sensor arrangement comprises three sensors, and wherein the angle between two adjacent sensors of the three sensors, measured in the first plane at the point coinciding with the travel path of the magnet, is approximately 90 degrees or approximately 120 degrees. ### Claim 13 (depends on 1) The power tool according to claim 1, wherein the power tool comprises a control unit configured to monitor the position of the throttle lever based on data from the sensor arrangement. ### Claim 14 (depends on 13) The power tool according to claim 13, wherein the control unit is arranged on the circuit board, and wherein the sensor arrangement comprises at least two sensors, and wherein the control unit is configured to detect a displacement of the throttle lever from an unactuated position using data from the at least two sensors. ### Claim 15 (depends on 13) The power tool according to claim 13, wherein the power tool comprises a power source controller, wherein the control unit is operably connected to the power source controller, and wherein the power source controller is configured to control the power of the power source in dependence of the monitored position of the throttle lever. ### Claim 16 (depends on 15) The power tool according to claim 15, wherein the power tool comprises an electronic communication bus, wherein the control unit is operably connected to the power source controller via the electronic communication bus, and wherein the control unit comprises a microprocessor that is operably connected to the human machine interface. ### Claim 17 (depends on 13) The power tool according to claim 13, wherein the circuit board comprises a first electronic communication bus configured to transfer data between the sensor arrangement and a microprocessor, and wherein the human machine interface comprises a microcontroller, and wherein the circuit board comprises a second electronic communication bus configured to transfer data between the microcontroller of human machine interface and the microprocessor. ### Claim 18 (depends on 1) The power tool according to claim 1, wherein the circuit board comprises a wireless communication unit configured to send and/or receive data to or from an external communication unit, and wherein the circuit board comprises a battery configured to, at least selectively, power the circuit board. ### Claim 19 A power tool comprising: a tool attachment, an elongated body, a first handle portion attached to the elongated body, a power source arranged to power the tool, a second handle portion attached to the elongated body and comprising a throttle lever, a circuit board located in a sealed enclosure, a human machine interface comprising components arranged on and adjacent a first side of the circuit board, a magnet operably connected to the throttle lever, wherein the magnet is moveably arranged along an arc in response to a displacement of the throttle lever, and a sensor arrangement configured to sense an intensity of a magnetic field of the magnet, wherein the sensor arrangement is arranged on and adjacent a second side of the circuit board, wherein the magnet is located outside of the sealed enclosure and movably arranged along a travel path, wherein the sensor arrangement comprises at least two sensors each configured to sense the intensity of the magnetic field of the magnet, wherein the at least two sensors are arranged in a first plane substantially perpendicular to the travel path, and wherein an angle between two adjacent sensors of the at least two sensors, measured in the first plane at a point coinciding with the travel path of the magnet, is approximately 90 degrees or 120 degrees.