Machine tool that can be guided manually and having a housing

• US 10,160,111 B2
• Filed: 04/22/2013
• Issued: 12/25/2018
• Est. Priority Date: 04/24/2012
• Status: Active Grant

• Current Assignee: C.&E. Fein GmbH
• Original Assignee: C.&E. Fein GmbH
• Inventors: Blickle, Jurgen, Fruh, Uwe, Hess, Achim
• Primary Examiner(s): Weeks, Gloria R
• Application Number:
  US14/394,180
• Publication Number:
  US 20150144367A1
• Time in Patent Office: 2,073 Days
• Field of Search: 173100, 1731621, 1731622, 173210
• CPC Class Codes: B25F 5/001 Gearings, speed selectors, clutches or the like specially adapted for rotary tools
• CPC Class Codes: B25F 5/006 Vibration damping means
• CPC Class Codes: B25F 5/02 Construction of casings, bodies or handles B25F5/006, B25F5/008 take precedence

Abstract

A machine tool that can be guided manually has an outer housing that extends along a longitudinal axis and has a hand grip region. An electrical drive unit and a tool unit are accommodated in the outer housing and are mechanically uncoupled relative to the outer housing. The outer housing has a center 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 center of the outer housing.

Claims

1. A handheld oscillation machine tool comprising:

an outer housing extending along a longitudinal axis and having a gripping region which is provided for a hand of a user to engage and guide the handheld oscillation machine tool;

an electric drive unit accommodated in this outer housing and rotatively driving a driveshaft of the handheld oscillation machine tool, wherein an axis of rotation of the driveshaft either aligns parallel to a longitudinal axis of the outer housing or the axis of rotation coincides with the longitudinal axis of the outer housing; and

an oscillation tool arrangement arranged within a first end portion of the outer housing;

wherein;

the outer housing has a mass center arranged along the longitudinal axis in a section extending from a geometric center of the outer housing in a direction remote from the first end portion with respect to a length of the outer housing;

the outer housing has a defined inner contour, and the electric drive unit and the oscillation tool arrangement are fixed together as a rigidly connected unit having a defined outer contour at a minimum spacing from the defined inner contour;

for adherence of this minimum spacing first support devices are provided at the outer contour, and second support devices are provided at the inner contour in positions opposed to the first support devices, and the first and second support devices cooperate to keep the defined outer contour at this minimum spacing from the defined inner contour;

the electric drive unit and the oscillation tool arrangement are mechanically decoupled from the outer housing by damping elements captured by and between the first and second support devices;

at least one arrangement of first and second support devices with one of the damping elements captured therebetween is provided at the oscillation tool arrangement, and at least one arrangement of first and second support devices with another of the damping elements captured therebetween is provided at the electric drive unit; and

two auxiliary masses are arranged in the outer housing.

2. The handheld oscillation machine tool according to claim 1, wherein at least one operation arrangement of the handheld oscillation machine tool is mechanically coupled to the outer housing.

3. The handheld oscillation machine tool according to claim 1, wherein at least one control arrangement of the handheld oscillation machine tool is mechanically coupled to the outer housing.

4. The handheld oscillation machine tool according to claim 1, wherein at least one supply arrangement of the handheld oscillation machine tool is mechanically coupled to the outer housing.

5. The handheld oscillation machine tool according to one of claims 2 to 4, wherein the at least one operation arrangement, and/or at least one control arrangement, and/or at least one supply arrangement is mechanically decoupled from the electric drive unit.

6. The handheld oscillation machine tool according to claim 1, wherein at least one auxiliary mass is arranged in the outer housing.

7. The handheld oscillation machine tool according to claim 1, wherein a mass center of the outer housing is—

with respect to a total length of the outer housing—

arranged at a portion which extends into a direction remote from the first end portion of the outer housing as far as a distance that corresponds to 20% of the total length of the outer housing.

8. The handheld oscillation machine tool according to claim 1, wherein the mass center of the outer housing is arranged at a distance of approximately 15 mm from the geometric center of the outer housing in a direction remote from the first end portion.