Oscillatingly driven power tools with toothed belt drive

Patent metadata

Field	Value
Publication number	US-9512908-B2
Application number	US-201414149446-A
Country	US
Kind code	B2
Filing date	Jan 7, 2014
Priority date	Jan 7, 2013
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

The invention discloses an oscillatingly driven power tool, having a motor shaft that can be driven rotationally by a motor and that is coupled via a toothed-belt drive and an eccentric coupling drive to a tool spindle, for the purpose of driving the latter.

First claim

What is claimed is:

1. An oscillatingly driven power tool, comprising:
a motor having a motor shaft driven rotatingly by said motor;
a tool spindle;
a transmission being configured as a toothed-belt drive;
an eccentric coupling drive comprising an eccentric pin and an eccentric lever for driving said tool spindle, said toothed-belt comprising a toothed-belt being driven by said motor spindle and driving said eccentric pin; and
an eccentric lever mounted pivotably at a first end thereof, being driven by said eccentric pin at a second end thereof, said eccentric lever driving said tool spindle about a longitudinal axis thereof oscillatingly in a first alternating direction opposite to a second alternation direction in which said eccentric lever is driven.

2. The power tool of claim 1 , wherein said toothed-belt drive is lubricated.

3. The power tool of claim 1 , wherein said toothed-belt drive has a reduction ratio in the range from 1:2 to 1:5.

4. The power tool of claim 1 , wherein said toothed-belt drive has a reduction ratio in the range from 1:2.5 to 1:3.2.

5. An oscillatingly driven power tool, comprising:
a motor having a motor shaft rotatingly driven by said motor;
a tool spindle;
an eccentric coupling drive comprising an eccentric pin supported on an eccentric shaft and an eccentric lever for driving said tool spindle oscillatingly about a longitudinal axis thereof;
a transmission being configured as a toothed-belt drive comprising a toothed-belt engaging a first belt wheel being driven by said motor shaft and a second belt wheel driving said eccentric shaft;
wherein said eccentric pin, together with an eccentric bearing held thereon, are supported on said eccentric shaft; and
wherein said second belt wheel comprises a mass compensation for compensating any imbalance caused by said eccentric pin and said eccentric bearing.

6. The power tool of claim 5 , wherein said second belt wheel, for effecting said mass compensation, comprises a cutout on a side on which said eccentric pin is disposed.

7. The power tool of claim 5 , wherein said toothed-belt drive is lubricated.

8. The power tool of claim 5 , wherein said toothed-belt drive has a reduction ratio in the range from 1:2 to 1:5.

9. The power tool of claim 5 , wherein said toothed-belt drive has a reduction ratio in the range from 1:2.5 to 1:3.2.

10. The power tool of claim 5 , wherein said eccentric lever further comprises a first end engaging said eccentric bearing and a second end being pivotable about an eccentric lever shaft.

11. The power tool of claim 10 , further comprising an oscillating lever having a first end and a second end, said first end of said oscillating lever engaging said eccentric lever shaft rotatably, said second end of said oscillating lever being fixed to said tool spindle for driving said tool spindle oscillatingly.

12. The power tool of claim 11 , further comprising a bearing axis about which said oscillating lever is supported pivotably.

13. The power tool of claim 12 , wherein said bearing axis is arranged between said tool spindle and said eccentric lever axis.

14. The power tool of claim 10 , wherein said eccentric coupling drive further comprises a counterweight being driven by said eccentric lever.

15. The power tool of claim 14 , wherein said counterweight is arranged at said first end of said eccentric lever.

16. The power tool of claim 14 , further comprising a transmission housing, wherein said transmission and said eccentric coupling drive extend, and a machine housing enclosing said transmission housing, wherein said counterweight is arranged outside of said transmission housing but inside of said machine housing.

17. An oscillatingly driven power tool, comprising:
a motor having a motor shaft driven rotatingly by said motor;
a tool spindle;
a transmission being configured as a toothed-belt drive; and
an eccentric coupling drive being driven by said motor shaft and driving said tool spindle oscillatingly about a longitudinal axis thereof.

18. The power tool of claim 17 , wherein said toothed-belt drive comprises a toothed-belt engaging a first belt wheel being driven by said motor shaft, and further engaging a second belt wheel driving said eccentric coupling drive.

19. The power tool of claim 18 , wherein said eccentric coupling drive comprises an eccentric pin being driven by said second belt wheel, and an eccentric bearing arranged on said eccentric pin, said eccentric bearing being engaged by an eccentric lever oscillatingly driving said tool spindle.

20. The power tool of claim 19 , further comprising an eccentric shaft whereon said eccentric pin, together with said eccentric bearing held thereon, and said second belt wheel are arranged, said second belt wheel further comprising a mass compensation compensating any imbalance caused by said eccentric pin and said eccentric bearing.

Assignees

• Clabunde Joachim
• Fein C & E Gmbh

Inventors

• Clabunde Joachim

Classifications

• B24B47/12

  by mechanical gearing or electric power (B24B47/16 takes precedence) · CPC title

• Y10T74/18152

  Belt or chain carried member · CPC title

• B24B41/007

  Weight compensation; Temperature compensation; Vibration damping · CPC title

• F16H19/08 Primary

  for interconverting rotary motion and oscillating motion · CPC title

• B25F5/00

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title