Power Tool Coupling Device Dirt Removal Opening
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Solution Overview
Problem
Hand-held power tools often face issues with dirt accumulation in contact receiving regions, which can lead to unreliable connections and hinder the functionality of additional modules, especially in designs lacking dedicated dirt removal mechanisms.
Innovation Solution
Incorporating a coupling device with a contact receiving region that features a receiving opening and a dirt removal opening, arranged perpendicularly to each other, and connected as a common opening, to prevent dirt accumulation and facilitate easy removal, ensuring reliable contact and energy transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contact receiving region is designed to receive contact elements of additional modules, then electrical connection reliability is improved, but dirt accumulation in the contact receiving region causes connection failures
Solution Approach 1:
The patent extracts the harmful factor (dirt) from the contact receiving region by providing a dedicated dirt removal opening that allows dirt to be removed from the contact receiving region, thereby maintaining connection reliability without compromising the electrical contact function
Solution Approach 2:
The opening structure is segmented into two distinct openings: a receiving opening for contact elements and a dirt removal opening for dirt extraction. This segmentation allows the contact receiving region to simultaneously accommodate contact elements while providing a separate path for dirt removal, resolving the contradiction between maintaining reliable electrical connections and preventing dirt accumulation
2Object-affected harmful factors
If a dirt removal mechanism is added to the coupling device, then dirt removal capability is improved, but device complexity increases
Solution Approach 1:
The dirt removal opening enables the coupling device to self-clean by allowing dirt to fall out of the contact receiving region under gravity or during assembly/disassembly operations. This passive dirt removal mechanism eliminates the need for active cleaning systems, motors, or complex mechanisms, thereby maintaining simple device architecture while effectively addressing dirt accumulation
Solution Approach 2:
The dirt removal function is merged with the existing coupling device structure by integrating the dirt removal opening into the housing or contact holder. This merging approach allows dirt removal capability to be added without requiring a separate, complex dirt removal system, thus improving dirt removal capability while minimizing increases in device complexity
3Object-affected harmful factors
If the receiving opening and dirt removal opening are arranged perpendicularly, then dirt removal efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The opening structure utilizes three-dimensional spatial arrangement by positioning the receiving opening and dirt removal opening in perpendicular directions. This dimensional approach allows dirt to be removed from the contact receiving region in a direction perpendicular to the contact element insertion path, maximizing dirt removal efficiency while the perpendicular arrangement provides clear geometric definitions that simplify manufacturing tolerances compared to more complex angular arrangements
Data Source
AI summary
A hand-held power-tool device includes at least one coupling device, which has at least one contact receiving region, and which is configured to couple an optional additional module to at least one energy supply unit, in at least one operating state. The at least one contact receiving region has (i) at least one receiving opening configured to receive a corresponding contact element of the optional additional module, and (ii) at least one dirt removal opening.