Gear Case Grip Trigger for Two-Handed Use in Tight Spaces
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Solution Overview
Problem
Existing power tools designed for two-handed operation using side handles are impractical in tight spaces, leading to potential loss of control and safety risks when the side handle becomes loose or unstable.
Innovation Solution
A mountable gear case grip accessory with a pivotable trigger assembly that allows two-handed operation by covering the gear case and engaging the tool's switch without a side handle, ensuring stable grip and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a side handle is mounted on the power tool for two-handed operation, then user safety and stability are improved, but the tool becomes impractical for use in tight spaces
Solution Approach 1:
The invention separates the safety function from the traditional side handle structure. The trigger assembly is segmented into a trigger body, idler arm, and switch engagement components that can be mounted directly on the gear case, eliminating the need for a separate side handle while maintaining two-handed operation safety
Solution Approach 2:
The gear case cover serves multiple functions: it protects the gear case, provides mounting for the trigger assembly, and integrates the safety switch mechanism. This multi-functional design eliminates the need for additional side handle components while maintaining safety functionality
2Stability of the object's composition
If a side handle is required for tool operation, then control stability is improved, but the device complexity increases
Solution Approach 1:
The trigger assembly merges the trigger mechanism, idler arm, and switch engagement features into a single integrated component that mounts directly on the gear case. This consolidation reduces the number of separate parts compared to a traditional side handle while maintaining control stability through the palm-actuated trigger design
Solution Approach 2:
The trigger assembly includes self-contained spring mechanisms that automatically bias the trigger and idler arm to their respective positions. The spring between the trigger and cover biases the trigger away from the switch, while the spring between the idler arm and trigger biases the idler arm towards the switch, eliminating the need for external adjustment mechanisms
3Reliability
If the trigger assembly uses springs to bias components, then the operation reliability is improved, but the device complexity increases
Solution Approach 1:
The idler arm serves as an intermediary component that translates the trigger's movement into switch activation. The spring between the idler arm and trigger provides the biasing force that ensures reliable engagement with the switch while the trigger is held in the depressed position, improving operational reliability through controlled mechanical interaction
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 safe and effective two-handed operation of power tools in confined spaces by maintaining tool stability and preventing accidental activation without a side handle, enhancing user safety and control.
Implementation Method 1
the trigger assembly includes a spring disposed between the trigger and the cover to bias the trigger away from the switch
Implementation Method 2
the trigger assembly includes a spring disposed between the idler arm and the trigger to bias the idler arm towards the switch
Data Source
AI summary
A power tool is provided including a housing, an electric motor disposed within the housing, a first trigger disposed on the housing, and a gear case mounted on an end of the housing. An accessory is provided that is mountable to the gear case and includes a second trigger pivotably secured relative to the gear case. The second trigger switch extends substantially along a surface of the gear case in a depressed position and being actuatable by a palm of an operator of the power tool. The supply of power from the power source to the electric motor is enabled only upon actuation of both the first trigger and the second trigger.