# US 11,306,446 B2 · Hand-held work tool with decoupled drawbar carrier > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,306,446 B2 - Document ID: US11306446B2 - Status: Granted - Kind: B2 - Application number: 16/849,137 - Filed: 2020-04-15 - Published: 2020-10-22 - Granted: 2022-04-19 - Earliest claimed: 2019-04-16 - Assignees: Wacker Neusen Produktion GmbH & Co. KG - Applicants: Wacker Neuson Produktion GmbH & Co. KG - Inventors: Robert Hartmann; Andreas Bartl; Martin Simon; Ferdinand Rupp - Web page: https://patentgrep.com/patent/US11306446B2 ## CPC - E01C 19/402: {the tools being hand-guided} - E01C 19/38: with means specifically for generating vibrations {, e.g. vibrating plate compactors, immersion vibrators (E01C19/40, E01C19/41 take precedence)} - E01C 21/00: Apparatus or processes for surface {soil} stabilisation for road building or like purposes, e.g. mixing local aggregate with binder ({recycling in place or on the road involving soil stabilisation E01C23/065} ; stabilising soil under existing surfacing E01C23/10; soil-conditioning or soil-stabilising materials C09K17/00; soil consolidation in general E02D3/12) - E02D 3/074: Vibrating apparatus operating with systems involving rotary unbalanced masses (E02D3/054 takes precedence) - B06B 1/16: operating with systems involving rotary unbalanced masses - E01C: CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR (forming roads or like surfaces by compacting or grading snow or ice E01H) - E02D: FOUNDATIONS; EXCAVATIONS; EMBANKMENTS (specially adapted for hydraulic engineering E02B); UNDERGROUND OR UNDERWATER STRUCTURES {(tunnels, tunnelling, mining E21)} - B06B: METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, {e.g.} FOR PERFORMING MECHANICAL WORK IN GENERAL (for particular applications, see the relevant subclasses, e.g. B07B1/40, B23Q17/12, B24B31/06; measurement of mechanical vibrations G01H; in direction finding, locating, distance or velocity measuring G01S; {generating seismic energy G01V1/02}; control of mechanical vibrations in general G05D; sound-producing devices, e.g. bells, sirens, whistles G10K, {e.g. methods or devices for transmitting, conducting, or directing sound in general G10K11/00}; generation of electrical oscillations H03B; electromechanical resonators in general H03H; electromechanical transducers {for communication techniques, e.g. microphones, speakers} H04R) ## Abstract A hand-held power tool has a lower mass and an upper mass. The lower mass has a tool and a working device for causing the tool to effect a work movement. The upper mass is movable relative to the lower mass and has a drive motor for the working device. A first vibration decoupling device is arranged between the lower mass and the upper mass for decoupling the upper mass from the lower mass in terms of vibration. A guide drawbar guides is provided for guiding the work tool by an operator. An electrical energy storage provides electrical energy for starting the drive motor. A drawbar carrier is carried by the upper mass and is connected to the upper mass via a second vibration decoupling device. The guide drawbar is attached to the drawbar carrier, and the energy storage is carried by the drawbar carrier. ## Claims ### Claim 1 A hand-held work tool, comprising: a lower mass which has a tool and a working device for causing a working movement of the tool; an upper mass which is movable relative to the lower mass and which has a drive component for the working device; a first vibration decoupling device, arranged between the lower mass and the upper mass, for decoupling the upper mass from the lower mass in terms of vibration; a guide drawbar for guiding the work tool by an operator; an electrical energy storage which provides electrical energy for the drive component; and a drawbar carrier which is carried by the upper mass and which is connected to the upper mass via a second vibration decoupling device; wherein the guide drawbar is attached to the drawbar carrier; and wherein the energy storage is mounted on the drawbar carrier. ### Claim 2 (depends on 1) The work tool according to claim 1, wherein the working component has a drive motor for the working device. ### Claim 3 (depends on 1) The work tool according to claim 1, wherein the energy storage that is carried by the drawbar carrier is a first energy storage; and wherein the drive component has a second energy storage which is arranged on the upper mass. ### Claim 4 (depends on 1) The work tool according to claim 1, wherein the drawbar carrier is arranged in a region of the upper mass which is facing an operator. ### Claim 5 (depends on 1) The work tool according to claim 1, wherein the guide drawbar is pivotally mounted relative to the drawbar carrier. ### Claim 6 (depends on 1) The work tool according to claim 1, wherein the second vibration decoupling device has multiple connection points between the drawbar carrier and the upper mass. ### Claim 7 (depends on 1) The work tool according to claim 1, wherein at least four connection points are provided between the drawbar carrier and the upper mass; and wherein three of the four connection points span an imaginary plane, and the fourth connection point has a vertical distance from the plane which corresponds at least to half the smallest distance that the fourth connection point has from the closest of the other three connection points. ### Claim 8 (depends on 1) The work tool according to claim 1, wherein six connection points are provided between the drawbar carrier and the upper mass; and wherein at least two of the six connection points are arranged at a different height plane than the remaining connection points, based on a provided use position of the work tool in a horizontal plane. ### Claim 9 (depends on 1) The work tool according to claim 1, wherein the connection points are each formed by buffer elements. ### Claim 10 (depends on 9) The work tool according to claim 9, wherein the buffer elements each have a central axis in their longest direction; and wherein the central axis of the buffer elements of all connection points extend in at least three different spatial directions. ### Claim 11 (depends on 1) The work tool according to claim 1, wherein the buffer elements are arranged in such a way that they are subjected to pressure and/or thrust during operation of the work tool, but not to tension. ### Claim 12 (depends on 1) The work tool according to claim 1, further comprising a protective frame is which is connected with the upper mass or with the drawbar carrier. ### Claim 13 (depends on 1) The work tool according to claim 1, wherein—the guide drawbar has an elongated extension; and wherein a handle bracket for—a handlebar for gripping by the operator is provided at one end of the extension facing away from the upper mass. ### Claim 14 (depends on 1) The work tool according to claim 1, wherein the work tool is a vibrating plate for soil compaction.