Handheld Power Tool User Interface on Motor Endbell
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Solution Overview
Problem
Conventional power tools often have user interfaces that require larger housings to accommodate control features for regulating power, limiting packaging efficiency and size reduction opportunities.
Innovation Solution
A hand-held power tool design featuring a user interface on the motor endbell with a rotatable control knob and piloting/indexing features that guide and provide haptic feedback for selecting power modes, allowing for reduced tool size by internalizing control components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If user interface controls are provided on the power tool housing, then user interaction is enabled, but the tool size increases and packaging efficiency decreases
Solution Approach 1:
The user interface is relocated from the external housing surface to the internal motor endbell surface, utilizing an underutilized internal dimension of the tool structure. This spatial repositioning allows the control interface to be accessible during operation while eliminating the need for external control housing, thereby reducing overall tool volume.
Solution Approach 2:
The control interface components are nested within the existing motor endbell structure rather than being added as external attachments. The endbell serves dual purposes: motor mounting and user interface substrate, creating a compact integrated design that reduces packaging volume while maintaining full user interaction capability.
2Volume of moving object
If control features are integrated into the motor endbell, then tool size is reduced and packaging efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The motor endbell is designed to serve multiple functions simultaneously: motor mounting, structural support, and user interface substrate. This multi-functionality eliminates the need for separate control housing components, reducing overall part count and assembly complexity despite the advanced functionality integrated into the endbell.
Solution Approach 2:
The control interface features are merged with the motor endbell structure, combining previously separate functions into a single integrated component. This consolidation reduces the number of parts and assembly steps while achieving compact tool dimensions, as the endbell becomes both a structural and interactive element.
3Ease of operation
If piloting and indexing features are added to guide control knob rotation, then user feedback and precision are improved, but device complexity increases
Solution Approach 1:
Indexing features provide tactile feedback to the user during control knob rotation, indicating discrete mode positions through detectable stops or clicks. This feedback mechanism enables precise mode selection without requiring complex electronic sensors or actuators, achieving high control precision through simple mechanical feedback elements integrated into the endbell.
Solution Approach 2:
The piloting features guide the control knob rotation path and the indexing features provide positional feedback automatically through mechanical interaction, without requiring external control systems. The mechanism serves itself by using the rotation motion to engage with the piloting and indexing features, which naturally provide guidance and position indication through the motion itself.
Data Source
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AI summary
A hand-held power tool is provided that includes a housing assembly to support a motor. An output spindle protrudes from an output end of the housing assembly such that the output spindle rotates in response to a rotation of the motor. A user interface is located at the housing assembly opposite the output spindle. The user interface is configured to select one of a plurality of modes of operation of the hand-held power tool to regulate power supplied to the motor.