Detachable LED Light Unit for Hand-Held Power Tools
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Solution Overview
Problem
Existing hand-held power tools lack a self-sufficient light emitting unit that can be easily detached and repositioned to illuminate working areas from various angles, leading to cumbersome and inefficient illumination, especially in applications like polishing and sanding where directional lighting is crucial.
Innovation Solution
A hand-held power tool with a detachable light emitting unit that includes a light source, energy storage device, and switching element, allowing it to be used independently and adjusted for different illumination directions and angles, charged either directly or contactlessly from the tool, with a design that minimizes weight and bulk for improved usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light emitting unit is integrated into the power tool housing, then the illumination is stable and the tool structure is compact, but the light cannot be repositioned to illuminate from different angles and the unit cannot be used independently
Solution Approach 1:
The light emitting unit is designed as a separate, detachable module that can be removed from the power tool housing. This segmentation allows the light unit to be repositioned independently or used separately, providing illumination flexibility without complicating the overall tool structure through simple attachment and detachment mechanisms
2Ease of operation
If the light emitting unit is made self-sufficient with energy storage device, then it can be used independently after detachment, but the weight and volume of the unit increase
Solution Approach 1:
The energy storage device is extracted as a separate component within the detachable light emitting unit, enabling independent operation. This extraction allows users to separate the lighting function from the power tool while maintaining reasonable weight through dedicated battery integration rather than carrying the entire tool
Solution Approach 2:
The light emitting unit is designed with multi-functionality: it can operate while attached to the power tool (using tool power supply) or detached and used independently (using internal energy storage device). This universal design provides ease of operation in different scenarios without requiring excessive weight
3Use of energy by moving object
If the light emitting unit requires electrical connection to the power tool, then it can be charged from the tool, but it cannot function after detachment and removal
Solution Approach 1:
The energy storage device is pre-charged either by the power tool when attached or by an external charger before use. This preliminary energy storage action ensures the light unit can function independently after detachment without requiring complex real-time electrical connections, simplifying the overall system design
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 efficient and flexible illumination of working areas, allowing users to easily inspect surfaces for imperfections without the need for continuous tool operation, reducing user fatigue and improving work precision with a lightweight and compact design.
Implementation Method 1
an energy storage device adapted for storing electric energy and for supplying the electric energy to the at least one light source, when the light emitting unit is in its turned-on condition
Implementation Method 2
at least one light source adapted for emitting light towards the working area when the light emitting unit is attached to the tool housing
Data Source
AI summary
A hand-held power tool (10) features a tool housing (12) and a motor (24) located therein and a tool shaft (36) comprising a rotational axis (40), actuated by the motor (24), a working element (38) attached to a distal end of the tool shaft (36) and performing a working movement about the rotational axis (40) of the tool shaft (36), and a light emitting unit (100) releasably attached to the tool housing (12) in order to illuminate a working area (102) which the working element (38) works during intended use of the power tool (10). The light emitting unit (100) comprises a light source (104), a switching element (108) for switching the light emitting unit (100) between a turned-on condition and a turned-off condition, an energy storage device (110) for storing electric energy and supplying the electric energy to the light source (104) when the light emitting unit (100) is in its turned-on condition, and an external casing (112), in which the light source (104), the switching element (108) and the energy storage device (110) is located, wherein the light emitting unit (100) is operable as a self-sufficient unit after detachment and removal from the tool housing (12), in order to illuminate areas outside the working area (102) of the working element (38) and/or to illuminate the working area (102) from other incidence directions or angles differing from the point of view of the user during intended use of the power tool (10).