Hand-held power tool

Patent metadata

Field	Value
Publication number	US-12220800-B2
Application number	US-202118035394-A
Country	US
Kind code	B2
Filing date	Nov 9, 2021
Priority date	Nov 27, 2020
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

A hand-held power tool, including: a drive circuit for providing an adjustment signal as a function of actuation of a button, a control apparatus for adjusting a drive current for an electric motor of the hand-held power tool as a function of the adjustment signal, wherein the control apparatus is connected to an electrical energy source for operating the hand-held power tool via a first electrical line arrangement, the drive circuit is connected to the control apparatus via a second electrical line arrangement, a drive current line carrying the drive current for the electric motor is routed via an interruption switch, coupled to the button, for interrupting the drive current, and wherein an interference-suppression capacitor is connected to the drive power line via a first node and to the second electrical line arrangement via a second node.

First claim

What is claimed is:

1. A hand-held power tool comprising:
a drive circuit for providing an adjustment signal as a function of actuation of a button;
a controller for adjusting a drive current for an electric motor of the hand-held power tool as a function of the adjustment signal, the controller being connected to an electrical energy source for operating the hand-held power tool via a first electrical line arrangement, the drive circuit being connected to the controller via a second electrical line arrangement;
a drive current line carrying the drive current for the electric motor being routed via an interruption switch, coupled to the button, for interrupting the drive current; and
an interference-suppression capacitor being connected to the drive power line via a first node and to the second electrical line arrangement via a second node.

2. The hand-held power tool as recited in claim 1 wherein the interference-suppression capacitor is directly connected to the second electrical line arrangement.

3. The hand-held power tool as recited in claim 1 wherein the interference-suppression capacitor is connected to a neutral conductor potential or to a ground potential via the second electrical line arrangement.

4. The hand-held power tool as recited in claim 1 wherein the interruption switch is connected to the controller via a first section of the drive power line and is connected to the electrical energy source via a second section of the drive power line, wherein the interference-suppression capacitor is connected to the second section of the drive power line via the first node.

5. The hand-held power tool as recited in claim 1 wherein the interruption switch is opened or closed as a function of actuation of the button.

6. The hand-held power tool as recited in claim 1 wherein the drive circuit, the button, the interference-suppression capacitor and the interruption switch are part of a common component.

7. The hand-held power tool as recited in claim 1 wherein the drive circuit includes a circuit board on which at least one detector, coupled to the button, for detecting the actuation of the button is integrated.

8. The hand-held power tool as recited in claim 7 wherein the interference-suppression capacitor is integrated on the circuit board.

9. The hand-held power tool as recited in claim 8 wherein the interference-suppression capacitor is designed as an SMD component.

10. The hand-held power tool as recited in claim 1 wherein the drive circuit is integrated in a handle of the hand-held power tool and the button is actuatable from the outside of the handle.

11. The hand-held power tool as recited in claim 1 wherein the controller is configured to provide an operating voltage for the drive circuit via the second electrical line arrangement.

12. The hand-held power tool as recited in claim 1 wherein the second electrical line arrangement has lines with a maximum cross section of 1 mm 2 .

13. The hand-held power tool as recited in claim 12 wherein the second electrical line arrangement has lines with a maximum cross section of 0.5 mm 2 .

14. The hand-held power tool as recited in claim 13 wherein the second electrical line arrangement has lines with a maximum cross section of 0.33 mm 2 .

15. The hand-held power tool as recited in claim 1 wherein the drive current line has a line cross section of between 1.5 mm 2 and 5 mm 2 .

16. The hand-held power tool as recited in claim 1 wherein the interference-suppression capacitor has a capacitance of between 0.1 and 1 μF.

17. The hand-held power tool as recited in claim 1 wherein the interference-suppression capacitor is designed as a class X1 or a class X2 capacitor.

Assignees

• Hilti Ag

Inventors

• Forstner Markus
• Braml Georg
• Ringler Stefan

Classifications

• H02J7/70

  characterised by the mechanical construction · CPC title

• H02P29/028

  the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault · CPC title

• H01H9/06

  Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner · CPC title

• B25F5/00 Primary

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

• B25D2250/255

  Switches · CPC title