US 11,883,944 B2 · Actuator arrangement for a power tool

Abstract

A handheld power tool includes an actuator arrangement, which includes a movable trigger member and a sensor arrangement. The trigger member includes at least one magnetic element, and the sensor arrangement is responsive to a displacement of the magnetic element along with the movable trigger member relative to the sensor arrangement. The sensor arrangement includes an analog magnetic field sensor configured to provide a signal proportional to the position of the magnet, a first digital magnetic field sensor configured to provide a first digital switching point in response to the position of the magnet, and a second digital magnetic field sensor configured to provide a second digital switching point in response to the position of the magnet.

Claims15

Dependent claims

A handheld power tool comprising an actuator arrangement, wherein:

the actuator arrangement comprises a movable trigger member and a sensor arrangement;
the trigger member comprises at least one magnetic element;
the sensor arrangement is responsive to a displacement of the at least one magnetic element along with the movable trigger member relative to the sensor arrangement;
and
the sensor arrangement comprises:
an analog magnetic field sensor configured to provide a signal proportional to a degree of depression of the trigger member;
a first digital magnetic field sensor configured to provide a first signal in response to the at least one magnetic element reaching a first position defining a first switching point of the first digital magnetic field sensor;
and
a second digital magnetic field sensor configured to provide a second signal in response to the at least one magnetic element reaching a second position defining a second switching point of the second digital magnetic field sensor.

6 more elements

A method for calibrating a sensor arrangement for an actuator arrangement of a handheld power tool, the handheld power tool comprising a trigger member including a magnetic element, the sensor arrangement comprising an analog magnetic field sensor configured to provide a signal proportional to a degree of depression of the trigger member, a first digital magnetic field sensor configured to provide a first signal in response to the magnetic element reaching a first position defining a first switching point of the first digital magnetic field sensor, and a second digital magnetic field sensor configured to provide a second signal in response to the magnetic element reaching a second position defining a second switching point of the second digital magnetic field sensor, the method comprising:

displacing the magnetic element of the trigger member along the sensor arrangement by depressing the trigger member;
retrieving a response of the first analog magnetic sensor;
retrieving a response of the first digital magnetic sensor;
retrieving a response of the second digital magnetic sensor;
determining a switching point of at least one of the first and second switching points;
and
using the determined switching point as a fixed reference for a starting point for the analog magnetic sensor to determine when a trigger stroke should start.

4 more elements

Dependencies are inferred from the claim text.

Actuator arrangement for a power tool

Life of this patent

Actuator arrangement for a power tool

Life of this patent

Abstract

Claims15