# US 10,307,904 B2 · Power tool > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,307,904 B2 - Document ID: US10307904B2 - Status: Granted - Kind: B2 - Application number: 15/012,015 - Filed: 2016-02-01 - Published: 2016-08-04 - Granted: 2019-06-04 - Earliest claimed: 2015-02-02 - Assignees: Makita Corporation - Applicants: Makita Corporation - Inventors: Yonosuke Aoki - Web page: https://patentgrep.com/patent/US10307904B2 ## CPC - B25F 5/006: {Vibration damping means} - B23D 47/005: {Vibration-damping} - B23D 51/10: for hand-held or hand-operated devices - B23D 51/1615: {with shock absorbing means} - B24B 23/04: with oscillating grinding tools; Accessories therefor - B25F 5/00: Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for - B25F 5/02: Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} - B27B 19/006: {with oscillating saw blades; Hand saws with oscillating saw blades} - 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)} - 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) - B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS - B27B: SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR (saws specially adapted for pruning or debranching A01G3/08; sawing apparatus specially adapted for felling trees A01G23/091; features not restricted to a particular type of wood saw B23D, e.g. attaching saw blades B23D51/00; machine tool frames, beds, pillars or like members, in general B23Q1/01) ## Abstract It is an object of the invention to provide a technique for increasing the degree of freedom in designing a grip part in order to improve operability of a power tool. A representative electric vibration tool 100 is provided which mainly includes a body housing 101, an inner housing 110, a driving motor 115 and a spindle 124. A blade 145 as a tool accessory is held between the spindle 124 and a clamp shaft 127 and driven by the driving motor 115. The driving motor 115 and the spindle 124 are housed within the inner housing 110. The inner housing 110 is housed within a front region of the body housing 101. A grip part 107 is arranged behind the front region of the body housing 101. ## Claims ### Claim 1 A power tool, which drives a tool accessory and performs an operation on a workpiece, comprising: a motor, a tool accessory driving shaft that has a rotation driving axis and is driven by the motor to reciprocatingly drive the tool accessory within a prescribed angular range around the rotation driving axis, an inner housing that houses the motor and at least part of the tool accessory driving shaft, an outer housing that has a first region for housing the inner housing and a second region which is different from the first region and configured to be held by a user during the operation of the power tool on the workpiece, and an elastic member that is disposed between the inner housing and the outer housing and reduces transmission of vibration from the inner housing to the outer housing. ### Claim 2 (depends on 1) The power tool as defined in claim 1, wherein the tool accessory driving shaft has a longitudinal axis that is parallel to a rotation axis of the motor. ### Claim 3 (depends on 1) The power tool as defined in claim 1, wherein the elastic member is arranged around an axis of the tool accessory driving shaft. ### Claim 4 (depends on 1) The power tool as defined in claim 1, wherein the elastic member is arranged around a rotation axis of the motor. ### Claim 5 (depends on 1) The power tool as defined in claim 1, wherein the elastic member includes a first elastic member and a second elastic member, and the first elastic member and the second elastic member are separate members that are disposed on opposite sides of the inner housing in a direction of the rotation driving axis of the tool accessory driving shaft. ### Claim 6 (depends on 1) The power tool as defined in claim 1, comprising a motor power switch for turning on and off the motor, wherein the motor power switch is disposed in the outer housing. ### Claim 7 (depends on 6) The power tool as defined in claim 6, wherein the motor power switch has a power switch operation part which is configured to be manually operated by the user, and the power switch operation part is configured to be slidable along a prescribed direction. ### Claim 8 (depends on 6) The power tool as defined in claim 6, comprising a motor speed-changing switch for changing rotation speed of the motor, wherein the motor speed-changing switch is disposed in the outer housing. ### Claim 9 (depends on 1) The power tool as defined in claim 1, wherein a battery mounting part to which a battery can be mounted is provided on a side of the second region opposite to the first region. ### Claim 10 (depends on 1) The power tool as defined in claim 1, further comprising a plurality of separate and spaced cylindrical elastic elements, wherein each of the plurality of separate and spaced cylindrical elastic elements is disposed coaxially with the tool accessory driving shaft. ### Claim 11 (depends on 1) The power tool as defined in claim 1, further comprising: a tool accessory holding member that can move between a clamp position to clamp the tool accessory between the tool accessory holding member and the tool accessory driving shaft in order to hold the tool accessory and a release position to release the clamping of the tool accessory in order to remove the tool accessory, and a holding mechanism for holding the tool accessory holding member in the clamp position, wherein the holding mechanism includes an engagement member that can engage with the tool accessory holding member in the clamp position, and a biasing member that biases the engagement member so as to provide the engagement member with a force of holding the tool accessory holding member in the clamp position. ### Claim 12 (depends on 11) The power tool as defined in claim 11, further comprising: a transmitting member that is connected to the tool accessory driving shaft and transmits rotation of the motor to the tool accessory driving shaft, wherein: the tool accessory is held on one end region of the tool accessory driving shaft and the engagement member is disposed on another end region of the tool accessory driving shaft in an axial direction of the tool accessory driving shaft from the one end region, and the transmitting member is connected to the tool accessory driving shaft between ends of the tool accessory driving shaft. ### Claim 13 The power tool as defined in 11, wherein the biasing member is disposed between an end of the tool accessory driving shaft and the transmitting member and biases the engagement member along the rotation driving axis of the tool accessory driving shaft. ### Claim 14 A power tool, which drives a tool accessory and performs an operation on a workpiece, comprising: a motor, a tool accessory driving shaft that has a rotation driving axis and is driven by the motor to reciprocatingly drive the tool accessory within a prescribed angular range around the rotation driving axis, an inner housing including: a first portion that houses at least part of the tool accessory driving shaft, a second portion that houses the motor, and a partition wall that separates and is a complete barrier between the first portion and the second portion, an outer housing that has a first region for housing the inner housing and a second region which is configured to be held by a user during the operation of the power tool on the workpiece, and an elastic member that is disposed between the inner housing and the outer housing and reduces transmission of vibration from the inner housing to the outer housing.