Thumbscrew Torque Limiter for Pluggable Module Attachment
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Solution Overview
Problem
Conventional pluggable modules face issues with connector damage from impact, inconsistent torque loads during installation, and poor electromagnetic interference (EMI) containment due to oversized front panels and flanges, which limit module density and compromise signal integrity.
Innovation Solution
Incorporating thumbscrews with torque limiters and protective extensions to secure the module connector, and reorienting the module attachment to improve EMI containment by securing the module back to the host connector, reducing the need for oversized front panels and flanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thumbscrews are used to secure pluggable modules to host devices, then the module can be firmly attached, but different users may apply different torque loads resulting in inconsistent connection quality
Solution Approach 1:
The thumbscrew system incorporates a torque limiter mechanism that automatically controls the maximum torque applied during installation. When the torque limiter engages, it prevents over-tightening by mechanically limiting the torque transmission, thereby ensuring consistent torque loads across different installations without requiring user expertise or additional tools.
2Ease of operation
If the module connector extends outside the shell for external access, then connectivity is improved, but the connector becomes susceptible to damage from shocks or impacts
Solution Approach 1:
The shell is designed with an opening that allows the module connector to extend outward for accessibility, while simultaneously incorporating protective features such as reinforced edges and shock-absorbing structures around the connector region. This beforehand cushioning approach protects the connector from impact damage during handling and installation while maintaining its external accessibility.
3Strength
If oversized front panels with flanges are used to accommodate thumbscrews, then secure attachment is achieved, but the footprint extends beyond the main body limiting module density
Solution Approach 1:
The design transitions from using oversized front panels with extending flanges to a compact configuration where the shell itself integrates the attachment features. By changing the geometric parameters of the shell and positioning the thumbscrew mounting points directly on the shell body, the footprint is reduced to match the main module dimensions while maintaining adequate attachment security through optimized thumbscrew placement and engagement geometry.
4Strength
If the module is attached to the front panel of the host device, then mechanical securing is achieved, but electromagnetic interference containment becomes difficult
Solution Approach 1:
The attachment mechanism is extracted from the front panel interface and relocated to the rear of the module where it connects to the host connector. This separation removes the mechanical attachment path from the EMI-sensitive front panel region, allowing the front panel to maintain its EMI containment function while the rear attachment provides secure mechanical fastening through the host connector's threaded receptacles.
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
The solution ensures consistent torque loads, protects the module connector from damage, and enhances EMI containment, allowing for closer module placement and improved signal integrity by addressing the limitations of traditional attachment methods.
Implementation Method 1
a torque limiter that substantially prevents application of tightening torques that exceed a predetermined maximum torque to the shaft when the threaded portion threadably engages the tapped hole
Implementation Method 2
The first end includes a threaded portion configured to threadably engage a tapped hole of the host device
Data Source
AI summary
In one example, a pluggable module comprises a shell, a module connector, and one or more thumbscrews. The shell defines a cavity within which a PCB and one or more components are disposed and includes a front, back, first side, and second side. The module connector is operatively connected to the PCB near the back of the shell and extends from within the cavity to outside the shell through an opening defined in the back of the shell. The module connector is configured to operatively couple the pluggable module to a host device. The thumbscrews are housed within one or more portions of the shell and are configured to threadably secure the pluggable module to the host device. Each of the thumbscrews comprises a torque limiter. The pluggable module can further comprise protecting means for protecting a portion of the module connector extending outside the cavity from damage.