# US 2015/0144367 A1 · Machine tool that can be guided manually and having a housing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0144367 A1 - Document ID: US20150144367A1 - Status: Published application - Kind: A1 - Application number: 14/394,180 - Filed: 2013-04-22 - Published: 2015-05-28 - Earliest claimed: 2012-04-24 - Assignees: C. & E. Fein GmbH - Applicants: C. & E. Fein GmbH - Inventors: Uwe Früh; Achim Hess; Jürgen Blickle - Web page: https://patentgrep.com/patent/US20150144367A1 ## CPC - B25F 5/006: {Vibration damping means} - B25F 5/001: {Gearings, speed selectors, clutches or the like specially adapted for rotary tools} - B25F 5/02: Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} - 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 The invention relates to a machine tool that can be guided manually and has an outer housing extending substantially along a longitudinal axis, which has a grip region which is provided for engaging and for guiding the machine tool by means of a hand of a user, comprising an electrical drive unit accommodated in said outer housing and a tool unit that is substantially mechanically uncoupled relative to the outer housing. The outer housing has a centre of mass that, with respect to the length of the outer housing, is arranged along the longitudinal axis in a section that extends toward the rear from the geometric centre of the outer housing. ## Claims ### Claim 1 A handheld oscillation machine tool comprising: an outer housing (12) extending essentially along a longitudinal axis and having a gripping region (21) which is provided for engaging and for guiding the machine tool (10) by means of a hand of a user; an electric drive unit (14) essentially accommodated in this outer housing (12) and rotatively driving a driveshaft of the machine tool (10), wherein the axis of rotation of the driveshaft is essentially aligned parallel to the longitudinal axis (11) of the outer housing (12) or coincides with said longitudinal axis; and a tool arrangement (15), which is arranged at a first end portion (3) of the outer housing (12); wherein the electric drive unit (14) and the tool arrangement (15) are essentially mechanically decoupled from the outer housing (12); and the outer housing (12) has a mass center (27) arranged along the longitudinal axis (11) in a section essentially extending from the geometric center (29) of the outer housing (12) into a direction remote from the first end portion with respect to the length of the outer housing (12). ### Claim 2 (depends on 1) A handheld oscillation machine tool according to claim 1, wherein the tool arrangement (15) is essentially rigidly coupled to the electric drive unit (14). ### Claim 3 (depends on 1) A handheld oscillation machine tool according to claim 1, wherein at least one operation arrangement (22, 23) of the machine tool (10) is mechanically coupled to the outer housing (12). ### Claim 4 (depends on 1) A handheld oscillation machine tool according to claim 1, wherein at least one control arrangement (24) of the machine tool (10) is mechanically coupled to the outer housing (12). ### Claim 5 (depends on 1) A handheld oscillation machine tool according to claim 1, wherein at least one supply arrangement (25) of the machine tool (10) is mechanically coupled to the outer housing (12). ### Claim 6 (depends on 3, 4, 5) A handheld oscillation machine tool according to one of claims 3 to 5, wherein the at least one operation arrangement (22, 23), and/or at least one control arrangement (24), and/or at least one supply arrangement (25) is essentially mechanically decoupled from the electric drive unit (14). ### Claim 7 (depends on 1) A handheld oscillation machine tool according to claim 1, wherein at least one auxiliary mass (26, 28) is arranged at the outer housing (12). ### Claim 8 (depends on 1) A handheld oscillation machine tool according to claim 1, wherein the outer housing (12) has a defined inner contour (20), and the electric drive unit (14) and the tool arrangement (15), insofar as these are arranged in the area of the outer housing (12), have a defined outer contour (19); and the outer contour (19) and the inner contour (20) are at a minimum spacing from each other. ### Claim 9 (depends on 8) A handheld oscillation machine tool according to claim 8, wherein for adherence of this minimum spacing a number N of first support devices (31, 32) is provided at the outer contour (19), and a number N of second support devices is provided at the inner contour (20); and the first support devices (31, 32) and the second support devices (36) cooperate in order to keep the outer contour (19) and the inner contour (20) at this minimum spacing from each other. ### Claim 10 (depends on 9) A handheld oscillation machine tool according to claim 9, wherein between a first support device (31, 32) and a second support device (36) at least one damping element (39) is arranged respectively. ### Claim 11 (depends on 9, 10) A handheld oscillation machine tool according to one of claim 9 or 10, wherein at least one arrangement of first (31, 32) and second (36) support device is arranged at the tool arrangement (15) and at least one arrangement of first (31, 32) and second (36) support devices is arranged at the electric drive unit (14). ### Claim 12 (depends on 1) A handheld oscillation machine tool according to claim 1, wherein the mass center (27) of the outer housing (12) is—with respect to the total length of the outer housing (12)—arranged at a portion which extends into a direction remote from the first end portion (3) of the outer housing (12) as far as a distance that corresponds to 20% of the total length of the outer housing (12), which particularly extends as far a distance that corresponds to 10% of the total length of the outer housing (12) and which especially preferably is arranged at a distance of approximately 7% from the geometric center (29) of the outer housing. ### Claim 13 (depends on 1) A handheld oscillation machine tool according to claim 1, wherein the mass center (27) of the outer housing (12) is arranged at a distance of approximately 15 mm from the geometric center (29) of the outer housing (12) in a direction remote from the first end portion.