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US 2019/0101422 A1Published application
Hand-Held Power Tool
AssigneeHilti Aktiengesellschaft
InventorsEgon KOENIGBAUER, Hans APPEL
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Abstract
A suction module for a hand-held power tool includes a motor-driven fan wheel, an intake channel for sucking in dust-laden air, and a collecting container for dust. A flow sensor has a sensor surface, which is formed of plastic and is arranged in the intake channel, an electric field meter facing the sensor surface for determining the electrostatic field strength on the sensor surface, and an evaluating unit for determining a flow rate of dust-laden air on the basis of the determined electrostatic field strength.
Claims5
-4. (canceled)
A suction module for a hand-held power tool, comprising:
- a motor-driven fan wheel;
- and
- an intake channel, wherein dust-laden air is drawn through the intake channel by the motor-driven fan wheel;
- and
- a flow sensor, wherein the flow sensor includes:
- a sensor surface which is formed of plastic and is disposed in the intake channel;
- an electric field meter which faces the sensor surface, wherein an electrostatic field strength at the sensor surface is determined by the electric field meter;
- and
- an evaluation unit, wherein a flow rate of dust-laden air in the intake channel based on the determined electrostatic field strength is determined by the evaluation unit.
6 more elements
Dependencies are inferred from the claim text.