Two-Stage Power Tool Trigger with Dual Biasing Assemblies
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Solution Overview
Problem
Traditional handheld power tools with simple on/off triggers lack efficient control mechanisms, making them less effective in applications requiring precise operation and ergonomic considerations, especially in industries like aerospace and automotive where access and process control are critical.
Innovation Solution
A power tool with a two-stage trigger that includes configurable operation characteristics, featuring a full range of motion with distinct regions and biasing assemblies to provide improved actuation progressivity and control, allowing for different operational characteristics in each region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple on/off trigger is used, then the device complexity is reduced, but the ease of operation and process control are worsened
Solution Approach 1:
The trigger mechanism is segmented into two distinct stages: a first stage with a first travel distance and force characteristic, and a second stage with a second travel distance and force characteristic. This segmentation allows different levels of control for different operational requirements, improving process control while maintaining manageable device complexity through modular design.
Solution Approach 2:
The trigger mechanism transitions from a static on/off binary state to a dynamic multi-stage system where the force and travel characteristics change at different stages. This dynamic behavior enables adaptive control - the first stage provides light resistance for sensitivity, while the second stage provides heavier resistance for confirmation, enhancing ease of operation without excessive complexity.
2Adaptability or versatility
If a two-stage trigger with configurable operation characteristics is implemented, then the adaptability and precision of control are improved, but the device complexity increases
Solution Approach 1:
Different regions of the trigger travel are assigned different operational qualities: the first stage has light spring resistance for sensitive control, while the second stage has heavy spring resistance for confirmed activation. This local differentiation of quality within the single trigger component provides adaptability for various operational needs without requiring multiple separate control mechanisms.
Solution Approach 2:
The single power control assembly integrates multiple functions into one component: it provides both a first stage for sensitive control and a second stage for confirmed activation, all within one trigger mechanism. This multi-functionality achieves adaptability without proportionally increasing device complexity, as one component performs what would otherwise require multiple separate controls.
3Measurement precision
If a two-stage trigger with biasing assemblies is used, then the measurement precision and control accuracy are improved, but the ease of manufacture decreases
Solution Approach 1:
The first biasing assembly is pre-configured to return the trigger to its initial position after actuation, and the second biasing assembly is pre-configured to provide resistance at the second stage. These preliminary mechanical actions ensure precise trigger position detection and consistent operational characteristics without requiring complex electronic sensors or adjustment mechanisms during manufacturing.
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
Enhances user experience and operational efficiency by enabling precise control over power application, reducing the risk of damage to objects and improving handling in constrained environments.
Implementation Method 1
a first biasing assembly that opposes movement of the trigger in the first region
Implementation Method 2
a second biasing assembly that opposes movement of the trigger at least at the transition point
Data Source
AI summary
A power tool (130) may include an end effector (200) configured to engage an object to be worked by the tool, a power unit (230), a drive assembly (210) configured to drive the end effector responsive to application of input power thereto, and a motor (220) configured to supply the input power to the drive assembly selectively based on operation of a power control assembly (240) that controls coupling of the motor to the power unit. The power control assembly includes a trigger (300) having a full range of motion (310) between a rest position and an actuated position. The power control assembly further defines a transition point (316) between a first region (312) and a second region (314) of the full range of motion. The power control assembly includes a first biasing assembly (330) that opposes movement of the trigger in the first region, and a second biasing assembly (340) that opposes movement of the trigger at least at the transition point.