Universal Lower Portion for Electric Enclosures with Bayonet and Screw Fastening
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Solution Overview
Problem
Existing electric and electronic enclosures require two different lower portions for bayonet-like fastening and screw fastening, increasing manufacturing and storage costs, as well as complexity in manufacturing and mounting due to the bayonet screw's structure, which is not suitable for situations where the cover needs to remain fixed.
Innovation Solution
A lower portion with a bore and shoulder-like stopper that can accommodate both bayonet-like fastening and conventional screws, with threads formed closer to the bottom to prevent damage and allow easy conversion between fastening methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bayonet-like fastening is used to quickly and easily fasten the cover to the lower portion, then the fastening speed and ease of operation are improved, but the device complexity increases due to the complex structure of the bayonet screw
Solution Approach 1:
The fastening system is divided into two independent components: the bayonet screw with mounting bracket for quick release functionality, and the thread structure in the bore for secure fixed mounting. This segmentation allows each component to perform its specific function optimally without compromising the other.
Solution Approach 2:
The bore is designed to accommodate both bayonet screws and conventional screws through the inclusion of threads. This multi-functionality allows the same enclosure structure to support different fastening methods depending on application requirements, eliminating the need for separate lower portions.
2Reliability
If a bayonet-like fastening is used to allow the cover to flexibly give way during electric arc, then the safety and reliability are improved, but the fastening stability deteriorates when the cover needs to remain fixed
Solution Approach 1:
The system provides dynamic fastening options: bayonet screws enable quick release and flexible movement for safety during electric arcs, while threaded screws provide rigid, stable fastening when the cover must remain fixed. The user can select the appropriate fastening method based on the specific application requirements.
Solution Approach 2:
The invention changes the fastening parameter from a single fixed type to multiple selectable types (bayonet or threaded). This parameter change allows the system to adapt between flexible quick-release functionality and stable fixed mounting, resolving the contradiction between safety during electric arc and fastening stability.
3Adaptability or versatility
If two different lower portions are manufactured for bayonet-like fastening and screw fastening, then the adaptability is improved, but the manufacturing cost and storage requirements increase
Solution Approach 1:
The bore is designed with threads that accommodate both bayonet screws and conventional screws. This universal design allows a single lower portion to support multiple fastening methods, eliminating the need to manufacture and store two different types of lower portions, thereby reducing manufacturing costs and inventory requirements.
Solution Approach 2:
The invention merges the functions of two separate lower portions (one for bayonet fastening and one for screw fastening) into a single unified lower portion. The bore contains both the shoulder-like stopper for bayonet mounting brackets and the threads for conventional screws, combining multiple fastening capabilities in one component.
4Adaptability or versatility
If threads are formed in the bore for receiving conventional screws, then the versatility is improved, but the manufacturing precision requirements increase to ensure threads are not damaged during bayonet screw installation
Solution Approach 1:
The threads are pre-formed in the bore at a specific position below the shoulder-like stopper before final assembly. This preliminary action ensures that when a bayonet screw is installed, the mounting bracket engages the shoulder stopper first, preventing the bayonet screw from contacting and damaging the threads. The same thread structure is then available for conventional screw installation when needed.
Data Source
AI summary
The invention relates to a lower portion of an electric and electronic enclosure, comprising a bottom and fastening arrangements for fastening a cover to the lower portion with a bayonet-like fastening, the fastening arrangements comprising a bore and a shoulder-like stopper for receiving a mounting bracket of a spindle-like element. So as to be able to fasten the cover to the lower portion with either bayonet snap lock means or conventional screws, the bore of the lower portion comprises threads for receiving the screw. The invention also relates to an electric and electronic enclosure.