Tool device

Patent metadata

Field	Value
Publication number	US-12064895-B2
Application number	US-202017597478-A
Country	US
Kind code	B2
Filing date	May 12, 2020
Priority date	Jul 10, 2019
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

A tool device, in particular a saw device, having a tool for processing a workpiece located in a working area. The tool device includes a tool braking device for braking a tool rotary movement of the tool, and a multi-joint arrangement by means of which the tool can be pivoted selectively in a feed direction into the working area or in a removal direction out of the working area. The multi-joint arrangement is designed to, while maintaining the pivotability of the tool, absorb and/or redirect forces occurring during braking of the tool rotary movement, so that the tool is not pivoted in the feed direction by the forces occurring during braking of the tool rotary movement or is pivoted in the removal direction by the forces occurring during braking of the tool rotary movement.

First claim

The invention claimed is:

1. A tool device with a tool for processing a workpiece located in a working area, comprising:
a tool braking device for braking a tool rotary movement of the tool, and
a multi-joint arrangement by means of which the tool can be pivoted selectively in a feed direction into the working area or in a removal direction out of the working area, wherein
the multi-joint arrangement is designed to, while maintaining the pivotability of the tool, absorb and/or redirect forces occurring during braking of the tool rotary movement, so that the tool is not pivoted in the feed direction by the forces occurring during braking of the tool rotary movement or is pivoted in the removal direction by the forces occurring during braking of the tool rotary movement,
wherein the multi-joint arrangement comprises a base section, a main swing arm pivotally mounted on the base section via a base section joint, a side swing arm pivotally mounted to the main swing arm via a main swing arm joint, and a secondary swing arm pivotally mounted to the side swing arm via a side swing arm joint and pivotally mounted to the base section via a secondary swing arm joint,
wherein an imaginary main swing arm axis extending through the base section joint and the main swing arm joint and an imaginary secondary swing arm axis extending through the secondary swing arm joint and the side swing arm joint run parallel to each other or converge at an axis angle on that side of the base section on which the tool is arranged.

2. The tool device according to claim 1 , wherein the multi-joint arrangement is designed and/or arranged in such a way that during braking of the tool rotary movement a centre of gravity of the tool device moves in a direction different from the feed direction during pivoting of the tool device.

3. The tool device according to claim 1 , wherein the multi-joint arrangement comprises at least four joints.

4. The tool device according to claim 1 , wherein the axis angle is between 45 degrees and 0 degrees.

5. The tool device according to claim 1 , wherein, over at least 80% of the pivot range of the multi-joint arrangement or over the entire pivot range of the multi-joint arrangement or over a pivot range of 55 degrees, the main swing arm axis and the secondary swing arm axis run parallel to each other or converge at an axis angle on that side of the base section on which the tool is arranged.

6. The tool device according to claim 1 , wherein, over at least 80% of the pivot range of the multi-joint arrangement, the main swing arm axis and the secondary swing arm axis converge at an axis angle on that side of the base section on which the tool is arranged.

7. The tool device according to claim 5 , wherein over at least 80% of the pivot range or over the entire pivot range, the change in the axis angle is less than 20 degrees.

8. The tool device according to claim 1 , wherein the tool is arranged coaxially with the main swing arm joint.

9. The tool device according to claim 1 , wherein the tool braking device is arranged on the side swing arm.

10. The tool device according to claim 1 , wherein the tool braking device is arranged in such a way that a force occurring in the main swing arm joint during braking of the tool rotary movement lies in an angular range of +−95 degrees about an axial direction lying on the main swing arm joint axis and pointing in the direction of the base section joint.

11. The tool device according to claim 1 , further comprising a drive unit for setting the tool in the tool rotary movement, wherein the drive unit is arranged on the main swing arm.

12. The tool device according to claim 1 , further comprising a drive unit for setting the tool in the tool rotary movement, the tool device being adapted to maintain a delay time of between 20 ms and 1 s between a triggering of the tool braking device and a switching off of the drive unit and, during the delay time, to redirect a drive force, which is provided by the drive unit and acts on the tool, by means of the multi-joint arrangement, so that the tool is pivoted in the removal direction.

13. The tool device according claim 1 , further comprising a linear bearing allowing a linear movement of the tool relative to the workpiece support surface, further comprising a linear bearing braking device adapted to brake and/or prevent the linear movement of the tool relative to the workpiece support surface when braking the tool rotary movement.

14. The tool device according to claim 1 , wherein the tool device is a saw device.

15. The tool device according to claim 4 , wherein the axis angle is between 15 degrees and 5 degrees.

16. The tool device according to claim 6 , wherein the main swing arm axis and the secondary swing arm axis run parallel to each other over the remaining portion of the pivot range.

17. The tool device according to claim 9 , wherein the tool braking device is arranged on the main swing arm joint or on the side swing arm joint.

18. The tool device according to claim 1 , wherein the tool braking device is arranged in such a way that a force occurring in the main swing arm joint during braking of the tool rotary movement lies in an angular range of +−45 degrees about an axial direction lying on the main swing arm joint axis and pointing in the direction of the base section joint.

19. The tool device according to claim 1 , wherein in a working position, in which the tool projects into the working area, and in a safety position, in which the tool is positioned outside the working area, the secondary swing arm joint is with regard to a vertical direction positioned above the main swing arm joint.

20. A tool device with a tool for processing a workpiece located in a working area, comprising:
a tool braking device for braking a tool rotary movement of the tool, and
a multi-joint arrangement by means of which the tool can be pivoted selectively in a feed direction into the working area or in a removal direction out of the working area,
wherein the multi-joint arrangement is designed to, while maintaining the pivotability of the tool, absorb and/or redirect forces occurring during braking of the tool rotary movement, so that the tool is not pivoted in the feed direction by the forces occurring during braking of the tool rotary movement or is pivoted in the removal direction by the forces occurring during braking of the tool rotary movement,
wherein the multi-joint arrangement comprises a base section, a main swing arm pivotally mounted on the base section via a base section joint, a side swing arm pivotally mounted to the main swing arm via a main swing arm joint, and a secondary swing arm pivotally mounted to the side swing arm via a side swing arm joint and pivotally mounted to the base section via a secondary swing arm joint,
wherein over at least 80% of the pivot range of the multi-joint arrangement, the main swing arm axis and the secondary swing arm axis converge at an axis angle on that side of the base section on which the tool is arranged.

21. The tool device according to claim 20 , wherein in a working position, in which the tool projects into the working area, and in a safety position, in which the tool is positioned outside the working area, the secondary swing arm joint is with regard to a vertical direction positioned above the main swing arm joint.

22. A tool device with a tool for processing a workpiece located in a working area, comprising:
a tool braking device for braking a tool rotary moveme

Assignees

• Festool Gmbh

Inventors

• Wildermuth Markus
• Frank Josua
• Ruhland Harald

Classifications

• B27B5/381

  with at least one brake member contacting saw blade portions · CPC title

• B27G19/02 Primary

  for circular saws · CPC title

• B27B5/208

  the saw blade being mounted on a hanging arm or at the end of a set of bars, e.g. parallelograms · CPC title

• B27B5/188

  the saw blade being mounted on a hanging arm or at the end of a set of bars, e.g. parallelograms · CPC title

• B23D59/001

  Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade (measuring in general G01; controlling in general G05) · CPC title