Snap-Fit Tether Mount for PDU Cable Retention
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Solution Overview
Problem
Existing cable retention systems for power distribution units in electronic equipment enclosures are cumbersome, obstruct airflow, and restrict access, as they require large anchor points and holes in enclosure panels.
Innovation Solution
A cable retention system featuring a tether and tether mount that can be snap-fitted to the power distribution unit, using an elongate portion with tie wrap loops and a channel for secure attachment, allowing for tool-less cord retention without obstructing airflow or requiring additional holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid cable retention bars and permanently-attached cable retention clips are used, then cable retention is achieved, but airflow channels are obscured and access to equipment is restricted
Solution Approach 1:
The patent uses a flexible tether made of thin material to retain cables instead of rigid bars and clips. This flexible tether can be routed through existing holes in the enclosure without creating additional obstructions to airflow channels, while still providing secure cable retention.
Solution Approach 2:
The patent extracts the cable retention function from large, obstructive anchor points and holes in the enclosure structure. Instead of requiring additional holes or large mounting areas, the system uses existing holes and a flexible tether that can be routed through them, removing the harmful effect of airflow obstruction while maintaining retention functionality.
2Reliability
If rigid cable retention bars and permanently-attached cable retention clips are used, then cable retention is achieved, but access to rear areas of equipment is restricted
Solution Approach 1:
The flexible tether can be routed through existing holes in the enclosure and adjusted to provide access to rear areas of equipment. Its flexibility allows it to conform to the enclosure geometry without creating rigid obstructions that would block access to equipment behind the PDU.
3Reliability
If anchor points for cable retention structures are used, then cable retention is achieved, but additional holes in enclosure paneling are required
Solution Approach 1:
The patent makes the existing holes in the PDU enclosure serve multiple functions: they are used both for cable passage and for tether attachment. This eliminates the need for additional dedicated anchor points or holes, reducing enclosure modification complexity while maintaining reliable cable retention.
Solution Approach 2:
The patent merges the functions of cable passage holes and tether anchor points into a single feature. The tether attaches to the enclosure at existing holes, combining what would traditionally be separate elements (passage openings and mounting points) into one integrated solution.
4Strength
If large anchor points are used for cable retention, then secure attachment is achieved, but airflow channels are obscured
Solution Approach 1:
The flexible tether provides secure attachment through its elasticity and routing through existing holes, without requiring large anchor points that would obstruct airflow. The tether's flexibility allows it to maintain attachment strength while having a minimal profile that does not block air channels.
Data Source
AI summary
A cable retention system for a power distribution unit includes a tether and a tether mount. The tether has an elongate portion and an attachment portion, and the attachment portion includes a channel therein. The tether mount has a base at a proximal end and a head at a distal end. The base is adapted to attach the proximal end of the tether mount to the power distribution unit. The tether is adapted to be secured to the tether mount by snap-fitting the head of the tether mount into the channel of the attachment portion.