Power tool

Patent metadata

Field	Value
Publication number	US-10052695-B2
Application number	US-201414909233-A
Country	US
Kind code	B2
Filing date	Jul 25, 2014
Priority date	Aug 1, 2013
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

The invention relates to a machine tool, in particular a hand held machine tool, which has a tool receiving device that is movable, in particular in an oscillating manner, around an output shaft ( 2 ). The tool receiving device is designed to hold a tool device on the machine tool in such a manner that the output shaft and a tool rotation axis substantially coincide. The tool receiving device has at least one torque transmission region ( 9 ) and a holding device ( 4 a, 4 b ). In order to transmit a driving force to the tool device, the torque transmission region has at least two output area regions ( 9 a ) that are arranged at a distance from said output shaft and each have a multiplicity of surface points. Here, the tangent planes to said surface points are inclined in regard to an axial plane which includes said output shaft. Furthermore, the tangent planes are inclined in regard to a radial plane which extends perpendicularly to the output shaft. In this way, the output torque is transmitted reliably to the tool device by the machine tool via the tool receiving device.

First claim

What is claimed is:

1. A rotary oscillating tool comprising:
an axial output shaft capable of rotary oscillation around a first axis;
a torque transmission unit in fixed communication with the axial output shaft and having first and second connection portions;
the first connection portion adapted to hold a tool device in such a manner that the first axis and an axis of rotation of the tool device are substantially coincident;
the second connection portion including a wall, the wall comprising at least two surface portions which are spaced from the first axis and which face towards the first axis and which are arranged to transmit torque to the tool device when the tool device is held by the first connection portion; and
each of the at least two surface portions having a plurality of surface points, each of the surface points having a respective tangent plane associated therewith, wherein the tangent planes associated with at least one surface point of each of said at least two surface portions is inclined relative to an axial plane and relative to a radial plane, wherein said axial plane is a plane that includes said first axis, and said radial plane is a plane that is perpendicular to said first axis.

2. The tool according to claim 1 , wherein the wall is at least partially concave in an area where at least a pair of adjacent surface portions meet.

3. The tool according to claim 1 , wherein the second connection portion has at least a first, upper boundary plane spaced apart from at least a second, lower boundary plane, wherein these boundary planes are disposed substantially perpendicular to the output shaft axis.

4. The tool according to claim 1 , wherein the second connection portion includes a plurality of output area regions which are arranged rotationally symmetrical around the output shaft axis.

5. The tool according to claim 1 , wherein the surface portions are arranged symmetrical to a plane of symmetry and are substantially contiguous and the output shaft axis is located in this plane of symmetry.

6. The tool according to claim 1 , wherein the wall extends over an angle of 360 degrees substantially without interruption around the output shaft axis.

7. The tool according to claim 1 , wherein between one of these tangent planes and said axial plane the angle β is included, wherein the angle β is selected from the group consisting of: less than 90 degrees, less than 70 degrees, less than 65 degrees, larger than 0 degrees, larger than 15 degrees, larger than 30 degrees, and substantially 30 degrees, 45 degrees or 60 degrees.

8. The tool according to claim 1 , wherein between one of these tangent planes and said radial plane the angle α is enclosed, wherein the angle α is selected from the group consisting of: less than 90 degrees, less than 80 degrees, less than 75 degrees, larger than 0 degrees, larger than 45 degrees, larger than 60 degrees, and in a range from 62.5 degrees to 72.5 degrees.

9. The tool according to claim 1 , wherein the second connection portion includes less than 32 surface portions.

10. The tool according to claim 1 , wherein the surface portions are arranged in the form of a star-shaped polygon.

11. The tool according to claim 10 , wherein a number of corners of said star-shaped polygon is selected from the group consisting of: 4, 6, 8, 10, 12, 14, 16, 18 and 20.

12. The tool according to claim 1 , further including an encoding device that comprises at least a first cross-sectional area and which has a first extent in a direction substantially perpendicular to the cross-sectional area.

13. The tool according to claim 1 , wherein the first connection portion comprises at least one of:
a screw,
a tie bean,
a hook,
a clip,
a ratchet,
a bayonet closure,
locking projections, and/or
a ball and block.

14. A tool device for use with a rotary oscillating tool comprising:
a torque acceptance member having first and second connection portions and having a first axis of rotation;
the first connection portion adapted to receive a clamp portion of the rotary oscillating tool;
the second connection portion including a wall, the wall comprising at least two surface portions which are spaced from the first axis and which face away from the first axis and which are arranged to receive torque to be transferred by the rotary oscillating tool when the tool device is held by the clamp portion; and
each of the at least two surface portions having a plurality of surface points, each of the surface points having a respective tangent plane associated therewith, wherein the tangent planes associated with at least one surface point of each of said at least two surface portions is inclined relative to an axial plane and relative to a radial plane, wherein said axial plane is a plane that includes said first axis, and said radial plane is a plane that is perpendicular to said first axis.

15. The tool device according to claim 14 , wherein the wall is at least partially convex in an area where at least a pair of adjacent surface portions meet.

16. The tool device according to claim 14 , wherein the second connection portion includes a plurality of torque receiving area regions which are arranged rotationally symmetrical around the output shaft axis.

17. The tool according to claim 14 , wherein the wall extends over an angle of 360 degrees substantially without interruption around the first axis.

18. The tool according to claim 14 , wherein the surface portions are arranged in the form of a star-shaped polygon.

19. The tool according to claim 18 , wherein a number of corners of said star-shaped polygon is selected from the group consisting of: 4, 6, 8, 10, 12, 14, 16, 18 and 20.

20. The tool device of claim 14 , wherein the tool is a saw.

21. A rotary oscillating tool and tool device comprising:
an axial output shaft capable of rotary oscillation around a first axis;
a torque transmission unit in fixed communication with the axial output shaft and having first and second connection portions;
the first connection portion is adapted to hold the tool device in such a manner that the first axis and an axis of rotation of the tool device are substantially coincident;
the second connection portion including a wall, the wall comprising at least two surface portions which are spaced from the first axis and which face towards the first axis and which are arranged to transmit torque to the tool device when the tool device is held by the first connection portion;
each of the at least two surface portions having a plurality of surface points, each of the surface points having a respective tangent plane associated therewith, wherein the tangent planes associated with at least one surface point of each of said at least two surface portions is inclined relative to an axial plane and relative to a radial plane, wherein said axial plane is a plane that includes said first axis, and said radial plane is a plane that is perpendicular to said first axis; and
wherein the tool device includes a torque acceptance member having first and second connection portions adapted to removably and substantially mate with the first and second connection portions of the torque transmission unit.

22. The tool device according to claim 21 , further comprising:
an operating area, which is adapted to act on a work piece or on an arrangement of work pieces, and
a tool connection region, which is adapted to transmit torque from the torque acceptance member to the operating area.

Assignees

• Fein C & E Gmbh
• Bosch Gmbh Robert

Inventors

• Klabunde Olaf
• Blickle Juergen
• Thomaschewski Walter
• Bek Fabian
• Delfini Stefano
• Fellmann Willi
• Luescher Bruno
• Bozic Milan
• Mathys Thomas
• Grolimund Daniel

Classifications

• B23B31/10

  characterised by the retaining or gripping devices or their immediate operating means · CPC title

• B23B31/008 Primary

  with arrangements for transmitting torque · CPC title

• B27B5/32 Primary

  Devices for securing circular saw blades to the saw spindle · CPC title

• Y10T279/33

  Member applies axial force component · CPC title

• B24B45/006

  Quick mount and release means for disc-like wheels, e.g. on power tools · CPC title