Fastener-Driving Tool Trigger Control Mechanism
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Solution Overview
Problem
Existing fastener-driving tools require manual adjustment to switch between contact actuation and sequential actuation modes, which can be cumbersome and time-consuming, especially for professionals like carpenters who need to alternate between these modes frequently.
Innovation Solution
A fastener-driving tool with a trigger control mechanism that automatically switches between contact actuation and sequential actuation modes without manual adjustment, using a combination of a movable workpiece-contacting element, a trigger, a control valve, and an actuation lever, where the actuation lever is held in an actuating position by a magnetic attraction when in contact actuation mode and moved sequentially by the user in the sequential actuation mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual adjustment mechanism (lever, latch, or switch) is provided to switch between contact actuation and sequential actuation modes, then the tool can operate in both modes, but the operation becomes cumbersome and time-consuming when switching modes frequently
Solution Approach 1:
The trigger assembly automatically determines and switches between contact actuation mode and sequential actuation mode based on the position of the workpiece-contacting element, without requiring manual intervention. The system self-adjusts by detecting whether the workpiece-contacting element is depressed, thereby eliminating the need for separate mode selection mechanisms and improving operational convenience.
Solution Approach 2:
The trigger assembly dynamically changes its actuation characteristics based on real-time conditions. When the workpiece-contacting element is not depressed, the system operates in sequential actuation mode requiring trigger depression. When the workpiece-contacting element is depressed, the system automatically switches to contact actuation mode where only workpiece contact is needed, creating a dynamic adaptation to operational needs.
2Measurement precision
If the workpiece-contacting element is required to be depressed against the workpiece before trigger actuation in sequential mode, then precise control is achieved, but the operation becomes slower and less efficient for continuous fastener driving
Solution Approach 1:
The system dynamically adapts its actuation requirements based on the state of the workpiece-contacting element. In sequential mode, precise dual-action control is enforced. In contact mode, the system relaxes the trigger requirement and allows automatic actuation upon workpiece contact alone, thereby increasing productivity when speed is prioritized over precision.
Solution Approach 2:
The system provides more actuation control than necessary for certain applications. By requiring both workpiece contact and trigger depression in sequential mode, the system ensures precise control when needed, but this same mechanism becomes a bottleneck when continuous fastener driving is required, hence the need for contact mode as an alternative.
3Productivity
If the trigger mechanism is held in depressed position for contact actuation mode, then continuous fastener driving is enabled, but the risk of accidental actuation increases
Solution Approach 1:
The actuation control is segmented into two independent pathways: sequential actuation requiring trigger depression, and contact actuation requiring workpiece-contacting element depression. This segmentation allows the system to provide continuous fastener driving capability through contact mode while maintaining a separate, safer trigger-based control pathway for when precision is needed, thereby reducing accidental actuation risk.
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 rapid and effortless switching between actuation modes, improving operational efficiency by allowing continuous fastener driving without manual intervention, enhancing user experience, especially for precision and non-precision nailing tasks.
Implementation Method 1
a magnet assembly disposed on the trigger and configured to hold the actuation lever in the actuating position when the trigger is in the actuated position
Data Source
AI summary
A fastener-driving tool includes a housing and a workpiece-contacting element movable between a rest position and an activated position. The tool also includes a trigger connected to the housing and movable between a rest position and an activated position, a control valve including an actuating pin, an actuation lever movably connected to the trigger and movable between a rest position and an actuating position adjacent to the actuating pin, and a trigger control mechanism associated with the actuation lever and configured for moving and holding the actuation lever in the actuating position. In a powered mode, the trigger control mechanism causes the-actuation lever to move and remain in the actuating position such that the tool is actuated each time the workpiece-contacting element contacts a workpiece and moves to the activated position causing the actuation lever to contact the actuating pin and initiate an actuation of the tool.