Rotary Hammer Dust Extractor Coupling With Protected Electrical Contacts
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Solution Overview
Problem
Existing dust extractor designs for rotary hammers often suffer from damaged electrical contacts when mounted on a surface, leading to improper function, or restrict airflow when engaging with air vents, compromising performance.
Innovation Solution
A power tool coupling arrangement featuring a mechanical slot or rail system for secure attachment of a dust extractor, combined with an electrical coupling that prevents accidental short circuits by positioning contacts on different surfaces, ensuring reliable power transmission without obstructing airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dust extractor engages with projecting electrical contacts from the surface of the housing, then the electrical connection is established, but the electrical contacts can be damaged when the rotary hammer is placed on a surface
Solution Approach 1:
The patent transitions from surface-mounted electrical contacts to contacts positioned within recesses or bores. This dimensional change from surface level to subsurface level protects the contacts from mechanical damage while maintaining electrical connectivity through the coupling interface between rotary hammer and dust extractor.
Solution Approach 2:
The electrical contacts are nested within recesses or bores in the housing and accessory housings. This nesting structure protects the vulnerable electrical contacts from external mechanical damage while allowing them to engage and establish electrical connection when the components are coupled together.
2Object-affected harmful factors
If the dust extractor is engageable with electrical contacts positioned in air vents of the rotary hammer, then the electrical contacts are not damaged when the rotary hammer is placed on a surface, but the airflow through the rotary hammer is restricted when mounted to the dust extractor
Solution Approach 1:
The patent separates the electrical contact function from the air vent function. Electrical contacts are positioned in dedicated recesses or bores on coupling surfaces, while air vents remain separate and unobstructed. This segmentation allows both electrical connection and airflow to function independently without compromising either.
Solution Approach 2:
The patent applies different functional qualities to different locations: electrical contacts are localized in protected recesses on specific coupling surfaces, while air vents maintain their original open structure in different locations. This local differentiation ensures that electrical contact protection does not compromise airflow pathways.
3Reliability
If the plurality of electrical contacts are mounted on different surfaces of the mechanical coupling, then accidental short circuits are prevented, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the mechanical coupling structure itself. The coupling structure integrates mechanical attachment features with electrical contact housings and positioning features. This merging eliminates the need for separate electrical contact mounting mechanisms, reducing overall device complexity while maintaining short circuit prevention through multi-surface contact arrangement.
Data Source
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AI summary
A power tool comprising: a power source; a power tool housing comprising a first mechanical coupling connectable with a second reciprocal mechanical coupling on a power tool accessory; and a first electrical coupling in electrical connection with the power source and mounted on the first mechanical coupling wherein the first electrical coupling is electrically connectable with a second reciprocal electrical coupling on the power tool accessory.