Power Tool Lighting Assembly With Protected Wire Passageway
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Solution Overview
Problem
Power tools with shadowless lighting assemblies face challenges in efficiently routing multiple wires for LEDs due to limited space, which can lead to visibility issues and operational inefficiencies.
Innovation Solution
A power tool design featuring a passageway defined by a secondary housing with increasing cross-sectional area, surrounded by sleeves, to efficiently route wires from a circuit board assembly to a lighting assembly, ensuring compact and protected wire routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LEDs are positioned radially around the output unit to create shadowless lighting, then visibility of the fastener is improved, but the number of wires required increases
Solution Approach 1:
Multiple wires carrying power and control signals for multiple LEDs are merged into a single bundled wire assembly that routes through a centralized passageway in the secondary housing, reducing the complexity of individual wire management while maintaining multiple light sources for shadowless illumination
Solution Approach 2:
A wire sleeve acts as an intermediary component that consolidates and protects multiple wires within the passageway, facilitating organized wire routing from the circuit board assembly to the lighting assembly while preventing wire damage and debris ingress
2Illumination intensity
If more wires are included to support multiple LEDs, then shadowless lighting is achieved, but the limited space within the handheld power tool is compromised
Solution Approach 1:
The passageway is designed with a varying cross-sectional area that expands in specific directions, allowing multiple wires to be routed in three-dimensional space rather than constrained to a simple linear path, thereby accommodating more wires without increasing the overall tool envelope
Solution Approach 2:
Wires are nested within a protective sleeve that is itself positioned within the passageway structure, creating a compact hierarchical arrangement that maximizes space utilization while protecting the wires and maintaining structural integrity
3Volume of moving object
If wires are routed through a compact passageway, then space is optimized, but wire wear and debris ingress increase
Solution Approach 1:
A wire sleeve serves as a protective intermediary between the wires and the external environment, preventing debris from entering the passageway and contacting the wires while allowing the wires to maintain their electrical function, thereby enhancing reliability in a compact routing configuration
Solution Approach 2:
The wire sleeve provides pre-established mechanical protection and friction reduction for the wires before they are subjected to wear from routing through the passageway, extending wire life and maintaining signal integrity in the compact space-constrained environment
Data Source
AI summary
A power tool includes a housing having a primary housing and a secondary housing coupled to the primary housing, a motor supported within the primary housing, an output member driven by the motor and extending from the secondary housing, a circuit board assembly supported within the primary housing, a passageway at least partially formed by the secondary housing, and a lighting assembly coupled to the secondary housing. The lighting assembly includes a light source configured to illuminate a workpiece, a wire extending from the circuit board assembly to the lighting assembly through the passageway, and a sleeve positioned in the passageway and surrounding at least a portion of the wire.