Jigsaw Handle and Switch Layout for Shock-Safe Operation
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Solution Overview
Problem
Existing power tools, such as jigsaws, often lack effective ergonomic design features that prevent electrical shock and user discomfort during operation, particularly when cutting electrical wires, and do not efficiently manage heat distribution.
Innovation Solution
A jigsaw design featuring a non-electrically conductive housing and handle with ergonomic gripping surfaces and activation switches positioned at an acute angle relative to the longitudinal axis, allowing for safe operation and reduced user fatigue, along with a drive system composed of non-conductive materials to prevent electrical shock and manage heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the housing and handle are made of electrically conductive materials for structural strength, then the structural integrity is improved, but the risk of electrical shock increases
Solution Approach 1:
The patent employs composite material construction where the housing and handle are made from non-conductive materials such as plastic or polymer composites. This allows the structural integrity to be maintained through proper material selection and design while inherently preventing electrical shock by blocking electrical conduction paths between the motor assembly and the user's hand.
2Ease of operation
If the activation switch is positioned for easy access, then the ease of operation is improved, but the risk of accidental activation increases
Solution Approach 1:
The activation switch is designed with a sliding mechanism that requires deliberate manual intervention to activate. The switch moves between engaged and disengaged positions along an axis perpendicular to the handle's longitudinal axis, requiring intentional user action rather than accidental activation. This dynamic design allows easy access while preventing unintended operation.
Solution Approach 2:
The switch mechanism incorporates an intermediary mechanical structure that mediates between the user's finger and the electrical circuit. The sliding switch requires deliberate pressure and movement to complete the electrical connection, serving as a protective intermediary that prevents accidental activation while maintaining operational accessibility.
3Device complexity
If the motor and transmission are closely integrated for compact design, then the device complexity is reduced, but the heat management becomes more difficult
Solution Approach 1:
The patent utilizes the non-conductive housing and handle structure as thermal management elements. The housing acts as a thermal barrier and dissipation path, conducting heat away from the motor and transmission assembly while maintaining electrical insulation. This integrated approach manages heat without adding separate cooling systems, balancing compact design with thermal control.
Data Source
AI summary
A power tool includes a housing having a base configured to support the power tool relative to a workpiece. The power tool includes a handle coupled to the housing. The handle defines a longitudinal axis and includes a first portion positioned between the longitudinal axis. The housing the base and a second portion opposite the first portion and extending away from the base. The power tool includes an activation switch coupled to a side surface of the housing. The activation switch is slidable in a direction parallel with a switch axis that intersects the longitudinal axis from a deactivated state, in which the drive system is non-operable, to an activated state, in which the drive system is operable. The activation switch is slidable toward the second portion of the housing from an intersection point between the switch axis and the longitudinal axis.