Hall Effect Trigger for Power Tools
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing trigger mechanisms in powered devices, such as power tools, suffer from limited variability of control and reliability due to bulky potentiometers and wear-prone switches, which occupy significant space and reduce the lifespan of the device.
Innovation Solution
A trigger apparatus utilizing a linear Hall effect sensor and an activation switch to measure changes in magnetic fields associated with trigger movement, allowing for precise control and improved reliability by reducing power consumption and wear, while enabling compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a potentiometer is used in the trigger mechanism, then the control variability is limited, but the device occupies a large amount of space
Solution Approach 1:
The patent replaces the mechanical potentiometer with a magnetic field-based sensing system. A magnet is attached to the trigger, and a Hall effect sensor detects the magnetic field changes as the trigger moves, eliminating the need for physical contact and reducing space requirements while maintaining control variability.
Solution Approach 2:
The patent changes the measurement parameter from physical position (potentiometer) to magnetic field strength (Hall effect sensor). This allows for more precise detection of trigger position with a smaller component footprint, improving both control variability and spatial efficiency.
2Reliability
If a switch is used to control power flow, then the power switching function is achieved, but the switch experiences significant wear reducing reliability
Solution Approach 1:
The patent eliminates the mechanical switch by using a Hall effect sensor to detect trigger position and control power electronically. This non-contact sensing method removes wear entirely, as there are no moving parts or electrical contacts in the trigger mechanism itself.
Solution Approach 2:
The patent introduces a magnet as an intermediary between the trigger and the sensor. The magnet carries the positional information without physical contact, allowing the Hall effect sensor to detect trigger position through magnetic field changes rather than direct mechanical or electrical contact.
3Adaptability or versatility
If a potentiometer with limited stroke is used, then the control range is restricted, but the component size is reduced
Solution Approach 1:
The patent changes from measuring physical displacement (potentiometer stroke) to measuring magnetic field variations (Hall effect sensor output). This allows for extended effective stroke since the magnet can move through a larger range while the sensor detects subtle magnetic field changes, increasing control range without proportionally increasing component size.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The combination of a linear Hall effect sensor and activation switch provides a reliable and compact trigger mechanism that enhances control variability and reduces wear, improving the overall performance and safety of powered devices.
Implementation Method 1
a linear Hall effect sensor for measuring a change in a magnetic field associated with the trigger being moved from the first position to the at least one second position
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3C
AI summary
A trigger apparatus for a powered device, such as a power tool is disclosed. The powered device comprises a trigger operable by a user to move from a first position to at least one second position so as to control an operation of the powered device. The trigger apparatus comprises: a linear Hall effect sensor for measuring a change in a magnetic field associated with the trigger being moved from the first position to the at least one second position,and configured to generate a sensor signal based on the measured magnetic field, for controlling the operation of the powered device; a power module configured to power,the linear Hall effect sensor, upon reception of an activation signal for indicating that the trigger apparatus is to be activated; and an activation switch configured to generate the activation signal, when the trigger is moved from the first position. A powered device comprising the trigger apparatus and a method of controlling an operation of a powered device are also disclosed.