# US 2015/0144366 A1 · Power tool > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0144366 A1 - Document ID: US20150144366A1 - Status: Published application - Kind: A1 - Application number: 14/554,890 - Filed: 2014-11-26 - Published: 2015-05-28 - Earliest claimed: 2013-11-26 - Assignees: Makita Corporation - Applicants: Makita Corporation - Inventors: Yoshitaka MACHIDA - Web page: https://patentgrep.com/patent/US20150144366A1 ## CPC - B25D 17/043: {Handles resiliently mounted relative to the hammer housing (B25D17/046 takes precedence)} - B25D 16/00: Portable percussive machines with superimposed rotation {, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit (combined percussion and rotary drilling adapted for earth drilling E21B6/00)} - B25D 17/24: Damping the reaction force {(resiliently mounted handles B25D17/043; dampers in connections of hammers to backhoes E02F3/966)} - B25F 5/006: {Vibration damping means} - B25D 2211/061: Swash-plate actuated impulse-driving mechanisms - B25D: PERCUSSIVE TOOLS {(percussive machines for forging B21J; hand-held drilling machines, in general B23B45/00, for wood B27C3/08; drilling machines, used for mining or quarrying, with reciprocating tool which is turned intermittently when out of contact with the working face E21B1/00)} - 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 hammer drill (101) comprises a main body (103) which houses a driving motor (110) and a driving mechanism and a handle (109) which is movable to the main body (103). Further, a coil spring (160) which biases the handle (109) is provided. In a state that the coil spring (160) biases the handle (109), the handle (109) is moved against the main body (103) in a longitudinal direction of a hammer bit (119) and vibration transmission from the main body (103) to the handle (109) is prevented. ## Claims ### Claim 1 A power tool which drives a tool bit in a longitudinal direction of the tool bit and performs an operation, comprising: a motor which has an output shaft being parallel to the longitudinal direction of the tool bit, a driving mechanism which is connected to the output shaft and driven by the motor, a main body which houses the motor and the driving mechanism, a main handle which is movable with respect to the main body, a guide element which guides the main handle such that the main handle moves in the longitudinal direction of the tool bit with respect to the main body, and a biasing member which is arranged between the main body and the main handle and biases the main body and the main handle in the longitudinal direction of the tool bit, wherein the main handle moves against the main body in a state that the main handle is biased by the biasing member, and transmission of vibration generated during the operation from the main body to the main handle is prevented. ### Claim 2 (depends on 1) The power tool according to claim 1, wherein a periphery of the motor is formed cylindrically, and the guide element is arranged outside the motor in a radial direction of the motor. ### Claim 3 (depends on 1) The power tool according to claim 1, wherein the guide element comprises a pair of guide element components, and a plurality of guide elements are arranged at respective positions which are different to each other in a circumference direction around the longitudinal direction of the tool bit. ### Claim 4 (depends on 3) The power tool according to claim 3, wherein the main handle includes a grip which extends in a direction crossing the longitudinal direction of the tool bit, and wherein a plurality of the guide elements are symmetrically arranged with respect to a plane which includes both of a longitudinal line of the tool bit and a extending line of the grip. ### Claim 5 (depends on 3) The power tool according to claim 3, wherein a pair of the guide element components comprises a metallic guide member arranged on one member among the main body and the main handle and a resin guide member arranged on the other member among the main body and the main handle. ### Claim 6 (depends on 3) The power tool according to claim 3, wherein the guide element components formed by a projection which extends in the longitudinal direction of the tool bit and is arranged on one member among the main body and the main handle and a recess which extends in the longitudinal direction of the tool bit and is arranged on the other member among the main body and the main handle, and wherein the main handle is configured to be moved with respect to the main body in a state that the projection and the recess are engaged and slid to each other, and the main handle is guided against the main body. ### Claim 7 (depends on 1) The power tool according to claim 1, wherein the guide element includes a movement amount defining part which defines amount of movement of the main handle with respect to the main body in the longitudinal direction of the tool bit. ### Claim 8 (depends on 1) The power tool according to claim 1, wherein the main handle includes a grip portion which is held by a user and an auxiliary handle attachable portion to which an auxiliary handle is attached, and wherein the grip portion and the auxiliary handle attachable portion are configured to move integrally in the longitudinal direction of the tool bit with respect to the main body. ### Claim 9 (depends on 8) The power tool according to claim 8, further comprising a guide portion which guides the auxiliary handle attachable portion against the main body. ### Claim 10 (depends on 8) The power tool according to claim 8, wherein the auxiliary handle attachable portion includes a ring portion which has an outer periphery to which the auxiliary handle is attached, the ring portion being configured to surround a part of the main body. ### Claim 11 (depends on 8) The power tool according to claim 8, wherein the main handle includes a connecting portion which fixedly connects the grip portion and the auxiliary handle attachable portion, and wherein the auxiliary handle attachable portion is arranged closer to the tool bit than the main handle in the longitudinal direction of the cool bit, and the grip portion is arranged opposite to the tool bit with respect to the auxiliary handle attachable portion in the longitudinal direction of the tool bit. ### Claim 12 (depends on 11) The power tool according to claim 11, wherein the main body includes a housing member which houses the motor and the driving mechanism, and wherein the auxiliary handle attachable portion, includes a contact portion which, is configured to contact with the housing member and the contact portion defines amount of movement of the main handle far from the tool bit in the longitudinal direction of the tool bit by contacting with the housing member. ### Claim 13 (depends on 1) The power tool according to claim 1, wherein the biasing member comprises a plurality of biasing elements which are arranged at respective positions being different to each other in a circumference direction around the longitudinal direction of the tool bit. ### Claim 14 (depends on 1) The power tool according to claim 1, further comprising a sealing member which seals a gap between the main handle and the main body.