# US 12,179,319 B2 · Impact tool > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,179,319 B2 - Document ID: US12179319B2 - Status: Granted - Kind: B2 - Application number: 17/981,569 - Filed: 2022-11-07 - Published: 2023-06-22 - Granted: 2024-12-31 - Earliest claimed: 2021-12-17 - Assignees: Makita Corporation - Applicants: Makita Corporation - Inventors: Takeshi Kamiya - Web page: https://patentgrep.com/patent/US12179319B2 ## CPC - B25B 21/02: with means for imparting impact to screwdriver blade or nut socket - B25F 5/02: Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} - B25B 21/026: {Impact clutches} - B25F 5/001: {Gearings, speed selectors, clutches or the like specially adapted for rotary tools} - B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING - 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 To reduce size increase, an impact tool includes a motor, a spindle located frontward from the motor and rotatable by the motor, a hammer supported by the spindle, an anvil strikable by the hammer in a rotation direction and having an insertion hole extending rearward from a front end of the anvil, a locking member supported by the anvil and movable to a locking position for locking a tip tool placed in the insertion hole and to an unlocking position for unlocking the tip tool, and a bit sleeve surrounding the anvil. The bit sleeve is movable to a movement-restricting position for restricting radially outward movement of the locking member and to a movement-permitting position for permitting radially outward movement of the locking member. The bit sleeve is at least partly between the hammer and the anvil in a radial direction. ## Claims ### Claim 1 An impact tool, comprising: a motor; a spindle located frontward from the motor and rotatable by the motor; a hammer supported by the spindle; an anvil strikable by the hammer in a rotation direction, the anvil having an insertion hole extending rearward from a front end of the anvil; a locking member supported by the anvil and movable to a locking position for locking a tip tool placed in the insertion hole and to an unlocking position for unlocking the tip tool; and a bit sleeve surrounding the anvil, the bit sleeve being movable to a movement-restricting position for restricting radially outward movement of the locking member and to a movement-permitting position for permitting radially outward movement of the locking member, the bit sleeve being at least partly between the hammer and the anvil in a radial direction. ### Claim 2 (depends on 1) The impact tool according to claim 1, wherein the hammer and the locking member overlap each other in an axial direction. ### Claim 3 (depends on 1) The impact tool according to claim 1, further comprising: a bearing supporting the anvil in a rotatable manner, wherein the bit sleeve is located rearward from the bearing. ### Claim 4 An impact tool, comprising: a motor; a spindle located frontward from the motor and rotatable by the motor; a hammer supported by the spindle; an anvil strikable by the hammer in a rotation direction, the anvil having an insertion hole extending rearward from a front end of the anvil; a bearing supporting the anvil in a rotatable manner; a locking member supported by the anvil and movable to a locking position for locking a tip tool placed in the insertion hole and to an unlocking position for unlocking the tip tool; a bit sleeve surrounding the anvil, the bit sleeve being movable to a movement-restricting position for restricting radially outward movement of the locking member and to a movement-permitting position for permitting radially outward movement of the locking member, the bit sleeve being located rearward from the bearing; and a hammer case holding the bearing, wherein the bit sleeve is accommodated rearward of the bearing in the hammer case. ### Claim 5 (depends on 3) The impact tool according to claim 3, wherein the locking member is located rearward from the bearing. ### Claim 6 (depends on 4) The impact tool according to claim 4, wherein the hammer case accommodates at least a part of the anvil. ### Claim 7 (depends on 4) The impact tool according to claim 4, wherein the locking member is accommodated in the hammer case. ### Claim 8 (depends on 4) The impact tool according to claim 4, further comprising: an operable member operable to move the bit sleeve; and a transmission configured to transmit a force applied to the operable member to the bit sleeve, wherein the operable member is located outside the hammer case. ### Claim 9 (depends on 1) The impact tool according to claim 1, wherein the anvil has a support recess on an outer surface of the anvil, the locking member includes a ball supported in the support recess, the anvil has a through-hole connecting an inner surface of the support recess to an inner surface of the insertion hole, the locking member is at least partly receivable in a groove on a side surface of the tip tool through the through-hole to lock the tip tool, and the locking position includes a position at which the locking member is at least partly received in the groove. ### Claim 10 (depends on 2) The impact tool according to claim 2, further comprising: a bearing supporting the anvil in a rotatable manner, wherein the bit sleeve is located rearward from the bearing. ### Claim 11 (depends on 4) The impact tool according to claim 4, wherein the locking member is located rearward from the bearing. ### Claim 12 (depends on 5) The impact tool according to claim 5, further comprising: a hammer case holding the bearing, wherein the bit sleeve is accommodated in the hammer case. ### Claim 13 (depends on 6) The impact tool according to claim 6, wherein the locking member is accommodated in the hammer case. ### Claim 14 (depends on 6) The impact tool according to claim 6, further comprising: an operable member operable to move the bit sleeve; and a transmission configured to transmit a force applied to the operable member to the bit sleeve, wherein the operable member is located outside the hammer case. ### Claim 15 (depends on 7) The impact tool according to claim 7, further comprising: an operable member operable to move the bit sleeve; and a transmission configured to transmit a force applied to the operable member to the bit sleeve, wherein the operable member is located outside the hammer case. ### Claim 16 (depends on 2) The impact tool according to claim 2, wherein the anvil has a support recess on an outer surface of the anvil, the locking member includes a ball supported in the support recess, the anvil has a through-hole connecting an inner surface of the support recess to an inner surface of the insertion hole, the locking member is at least partly receivable in a groove on a side surface of the tip tool through the through-hole to lock the tip tool, and the locking position includes a position at which the locking member is at least partly received in the groove.