Plug-in Module Fastening Device for Subrack Positioning
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Solution Overview
Problem
Existing plug-in modules in modular electronic devices face challenges in reliable and robust fastening within subracks due to tolerance issues and potential damage from screwing the front panel to the mounting rail, which can lead to unintentional detachment and damage to the connector and circuit board.
Innovation Solution
A fastening device comprising a bearing part, a clamping part, and a fastening element is used, where the clamping part is non-positively connected to the bearing part, allowing a force to be exerted transversely to the insertion direction, preventing movement and ensuring secure positioning without additional force on the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the front panel is screwed to the mounting rail of the subrack, then the plug-in module is securely fastened, but the circuit board and connector are subjected to excessive pressure and may be damaged
Solution Approach 1:
The patent introduces an intermediary fastening device between the front panel and the mounting rail. This device includes a bearing part that contacts the front panel and a clamping part that engages with the mounting rail, distributing the fastening force through multiple contact points and avoiding direct screwing of the front panel into the mounting rail, thereby reducing excessive pressure on the circuit board and connector
Solution Approach 2:
The fastening device is divided into separate functional components: a bearing part for supporting the front panel, a clamping part for engaging with the mounting rail, and a fastening element for securing the assembly. This segmentation allows each component to perform its specific function optimally while distributing mechanical loads away from the circuit board and connector
2Stability of the object's composition
If mounting screws are used to fasten the front panel, then the plug-in module is held in position, but the tolerance compensation is insufficient and the connector housing may be destroyed
Solution Approach 1:
The bearing part acts as an intermediary element that absorbs tolerance variations and mechanical stresses. It provides a compliant connection between the front panel and the mounting rail, allowing for tolerance compensation while preventing excessive forces from being transmitted to the connector housing
Solution Approach 2:
The fastening device changes the mechanical parameters of the connection by using elastic or compliant materials in the bearing part, allowing for dynamic adjustment and tolerance compensation. This enables the system to accommodate dimensional variations within specified tolerances without transmitting damaging forces to the connector housing
3Reliability
If the plug-in module is fastened using conventional mechanisms, then it is secured in the subrack, but the device complexity increases and the structure becomes more complicated
Solution Approach 1:
The patent combines multiple fastening functions into a single integrated device. The bearing part, clamping part, and fastening element work together as one unified fastening mechanism, eliminating the need for separate mounting brackets, screws, and alignment features, thereby reducing overall device complexity while maintaining fastening security
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Electronic plug-in assembly (4) for installation in a subrack (1) with a mounting rail (2), wherein the plug-in assembly (4) includes a printed circuit board (5), a front panel (6) and a mounting device (9), the mounting device (9) comprises a bearing part (10), a clamping part (11) and a fastening element (13), the bearing part (10) is attached to the front panel (6), and the clamping part (11) is positively connected to the fastening element (13) and the bearing part (10) in such a way that a force oriented transversely to the insertion direction of the plug-in assembly (4) in the subrack (1) is exerted on the plug-in assembly (4), by which the plug-in assembly (4) with its front panel (6) is fixed in a defined position relative to the subrack (1).