Fastener Trigger Assembly With Timed Actuation Mode Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fastener driving tools lack efficiency and ease of operation between sequential and contact actuation modes, and there is a need for tools that are lighter in weight and easily switchable between these modes without manual adjustments.
Innovation Solution
A trigger assembly for fastener driving tools that includes a pivotable trigger, actuation lever, actuation lever spring, ramp, and damper mechanism, allowing automatic switching between actuation modes based on a predetermined time period, requiring the operator to reset the trigger after a delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual adjustment mechanisms are added to switch between actuation modes, then mode switching capability is improved, but device complexity increases
Solution Approach 1:
The trigger assembly automatically switches between sequential and contact actuation modes based on the duration the trigger is held depressed, without requiring manual adjustment mechanisms. The system monitors trigger depression time and autonomously transitions between modes, eliminating the need for separate mode selection controls.
Solution Approach 2:
The actuation mode is made dynamic and time-dependent rather than static. The trigger assembly adapts its operational mode based on real-time trigger depression duration, allowing seamless transition between sequential and contact modes during operation without physical reconfiguration.
2Productivity
If the tool remains in contact actuation mode continuously, then operational efficiency is improved, but risk of accidental driving increases
Solution Approach 1:
The trigger assembly automatically exits contact actuation mode after a predetermined time period elapses without trigger depression, forcing a reset to sequential mode. This periodic interruption prevents continuous contact mode operation that could lead to accidental fastener driving, while still allowing efficient contact mode operation during intended use.
Solution Approach 2:
The system monitors the elapsed time since last trigger depression and provides feedback by automatically transitioning from contact to sequential mode when the threshold is reached. This feedback mechanism prevents unlimited contact mode operation and reduces accidental driving risk while maintaining operational efficiency during valid use periods.
3Reliability
If the trigger reset requirement is implemented after time delay, then safety is improved, but ease of operation deteriorates
Solution Approach 1:
The trigger assembly automatically manages the transition between actuation modes based on time elapsed, requiring operator intervention only when safety dictates. The system self-regulates the reset requirement rather than requiring manual mode switching, maintaining safety while minimizing operational disruption.
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
Enables efficient operation in contact actuation mode until a predetermined time elapses, then automatically switches to sequential mode, preventing accidental driving and ensuring operator resets, enhancing tool efficiency and ease of use.
Implementation Method 1
an actuation lever spring attached to the actuation lever and configured to bias the actuation lever to a first position
Implementation Method 2
a damper mechanism attached to the actuation lever to control a rate of movement of the actuation lever
Data Source
AI summary
A fastener driving tool including a housing and a workpiece contact element movably connected to the housing, where the workpiece contact element is movable between a rest position and an activated position. A trigger assembly including a bottom assembly and a top assembly is movably connected to the housing. The tool includes an actuation lever movably connected to the bottom assembly of the trigger assembly and movable between a rest position and an engaged position. The top assembly includes a downwardly extending block configured to engage the actuation lever. A damper mechanism is associated with the actuation lever and is configured to control a rate of movement of the actuation lever.