Electric tool

Patent metadata

Field	Value
Publication number	US-12290957-B2
Application number	US-201917281270-A
Country	US
Kind code	B2
Filing date	Sep 24, 2019
Priority date	Oct 2, 2018
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

A power tool, in particular a hand-held power tool, including a support section for setting down the power tool on a substrate, in particular on a workpiece and/or a guide element. The power tool has a support detection device and is designed to detect, by the support detection device, a first support state, in which the power tool is supported on the substrate by way of at least one first region of the support surface, and/or a second support state, in which the power tool is not resting on the substrate by way of at least the first region, and to determine an operating state of the power tool on the basis of the detected support state.

First claim

The invention claimed is:

1. A plunge saw with a lay-on section for laying the plunge saw onto an underlay, wherein the plunge saw comprises:
a saw blade,
a lay-on detection device, wherein the plunge saw is designed to detect, as a detected lay-on state, by way of the lay-on detection device, a first lay-on state, in which the plunge saw lies with at least a first region of the lay-on section on the underlay, and/or
a second lay-on state, in which the plunge saw does not lie with at least the first region on the underlay, and to determine an operating state of the plunge saw on a basis of the detected lay-on state,
wherein the lay-on detection device for detecting the first and/or the second lay-on state comprises a detection unit and a lever element, the lever element comprising a lay-on detection section which is formed by an end section of the lever element, wherein the lever element is designed to mechanically actuate the detection unit based on whether the lay-on detection section is actuated by the underlay,
wherein the lay-on detection device is designed to detect the first and/or the second lay-on state on the basis of whether the detection unit is mechanically actuated by the lever element,
wherein the plunge saw comprises a drive section for driving the saw blade, wherein the detection unit is arranged on the drive section and the lever element is movably mounted on the drive section,
wherein the plunge saw comprises a first pivot joint, via which the drive section together with the detection unit can be pivoted relative to the lay-on section into different first pivot positions, so as to adjust a plunge depth of the saw blade,
wherein the lay-on detection section in a feed direction is arranged behind a region of the saw blade.

2. The plunge saw according to claim 1 , wherein the lever element is designed to provide a mechanical coupling between the lay-on detection section and the detection unit invariantly to the first pivot positions, so that the lay-on detection device correctly detects the first and/or the second lay-on state in different first pivot positions of the drive section.

3. The plunge saw according to claim 1 , wherein the lay-on detection section comprises an actuation contour formed by an end contour of the lever element wherein the actuation contour is actuatable by the underlay and is designed concentrically to a pivot axis of the first pivot joint.

4. The plunge saw according to claim 1 , wherein the lay-on section comprises a lay-on surface and the lay-on detection section is movably mounted relative to the lay-on surface.

5. The plunge saw according to claim 1 , wherein the plunge saw is designed, for determining the operating state, to take into account, additionally to the detected lay-on state, one or more further input variables.

6. The plunge saw according to claim 5 , wherein the plunge saw is designed to detect the further input variable depending on the detected lay-on state.

7. The plunge saw according to claim 5 , wherein the further input variable comprises a distance, a force, a pressure, a moment, an acceleration, a rotation rate, a current, a voltage, a speed, a torque, a temperature and/or a sound.

8. The plunge saw according to claim 1 , wherein the plunge saw is designed, for determining the operating state, to take into account a currently detected lay-on state and a previously detected lay-on state.

9. The plunge saw according to claim 1 , wherein plunge saw is designed to determine a kickback state as the operating state, and specifically depending on whether the following conditions are cumulatively fulfilled:
the lay-on detection device detects the second lay-on state;
the lay-on detection device has detected the first lay-on state before the second lay-on state;
a current which is related to the motor which drives the saw blade lies above a predefined threshold value.

10. The plunge saw according to claim 1 , wherein the plunge saw is designed to determine, as the operating state, an error state, and/or a machining state.

11. The plunge saw according to claim 1 , the plunge saw is designed, as a reaction to the detected operating state, to deactivate the drive of the saw blade, to stop the saw blade and/or to bring the saw blade into a safety position.

12. The plunge saw according to claim 1 , wherein the plunge saw is designed, for determining the operating state, to take into account a lay-on state change from a previously detected lay-on state to a currently detected lay-on state.

13. The plunge saw according to claim 1 , wherein the detection unit is motion-coupled with the drive section, such that by pivoting the drive section via the first pivot joint relative to the lay-on section into a pivot position, the detection unit is pivoted together with the drive section.

14. The plunge saw according to claim 1 , wherein the lever element is arranged such that the lay-on detection section of the lever element directly contacts the underlay when the lay-on section lies on the underlay.

15. The plunge saw according to claim 14 , wherein the lever element is pivotably mounted on the drive section about a lever element pivot axis, wherein the lever element pivot axis and the pivot axis of the first pivot joint are oriented parallel to one another and are spaced apart from each other in a direction orthogonal to a direction of the lever element pivot axis.

Assignees

• Festool Gmbh

Inventors

• Rusch Marc
• Schmid Markus

Classifications

• B23D59/001 Primary

  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

• B27G19/04 Primary

  for manually-operated power-driven circular saws · CPC title

• B27G19/02

  for circular saws · CPC title