Unidirectional Locking Spool for Cable Unspooling

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Solution Overview

Problem

Existing spools for storing and distributing linear products, such as wire or cable, require additional equipment for controlled unspooling and are prone to tangling, lacking a mechanism for unidirectional rotation that allows for easy loading and unloading without machinery.

Innovation Solution

A spool design featuring a drum with inner and outer flanges, where the inner flanges have locking gears that allow rotation in one direction but not the other, enabling the spool to be positioned on a flat surface for easy unspooling and rolling without unwinding the material, with outer flanges being taller than inner flanges to suspend the drum for free rotation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional spools are used without locking mechanisms, then the spool can rotate freely in both directions, but the linear product becomes tangled and cannot be controlled during unspooling

Engineering Contradiction:

Improvecontrolled unspoolingVSAvoidlocking mechanism

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The locking gear automatically engages when the spool rotates in the unwinding direction, requiring no external equipment or manual intervention. The mechanism self-activates based on the direction of rotation, providing controlled unspooling while maintaining simplicity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The locking gear transitions between locked and unlocked states dynamically based on rotation direction. It locks during unwinding to control the linear product release, and unlocks during winding to allow free rotation, adapting its function to the operational phase

Inventive Principle:

Principle #15Dynamics

2Reliability

If additional equipment is used for controlled unspooling, then tangling is prevented, but the system becomes more complex and requires external machinery

Engineering Contradiction:

Improveprevention of tanglingVSAvoidexternal equipment

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The locking function is merged directly into the spool structure through the locking gear integrated with the flange assembly. This eliminates the need for separate external control equipment while maintaining reliable prevention of tangling during unspooling operations

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The spool's own rotational motion activates the locking mechanism, which automatically engages to prevent tangling during unwinding. No external machinery or additional equipment is required - the spool controls itself

Inventive Principle:

Principle #25Self-service

3Productivity

If the spool requires take-up machines for loading, then controlled winding is achieved, but the process becomes slower and less efficient

Engineering Contradiction:

Improveloading speedVSAvoidequipment-free operation

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The spool accepts linear product directly by hand or simple placement onto the drum, and the locking gear automatically manages the winding process. This eliminates the need for take-up machines while maintaining controlled operation, significantly improving loading speed and efficiency

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Instead of using external machines to control winding, the invention inverts the approach by using the spool's own structure to control the process. The locking gear on the spool itself provides the control function that previously required separate equipment

Inventive Principle:

Principle #13The other way round (Inversion)

4Adaptability or versatility

If the spool cannot be positioned on a flat surface, then it requires specialized equipment for handling, but positioning flexibility is reduced

Engineering Contradiction:

Improvepositioning flexibilityVSAvoidhandling without equipment

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The outer flanges serve multiple functions: they provide the locking gear interface for controlled rotation, act as bearing surfaces for positioning on flat surfaces like truck beds or ground, and enable the spool to be handled without specialized equipment. This multi-functionality increases adaptability while maintaining ease of operation

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11479439B2Unidirectional locking spool

Publication Date: 2022.10.25 ANDERSON TRAVIS HLDG LLC

AI summary

The spool for storing and distributing linear product has a drum and inner flanges defining the ends of the drum. The drum is configured to receive a linear product wound about the drum. The inner flanges have locking gears on the outside faces of the inner flanges. The spool has an axle supporting the inner flanges and a pair of outer flanges. The outer flanges each have an outer flange gear positioned in their inner face and corresponding to the inner flange gear. The inner and outer flange gears cooperate to allow the drum to rotate in a first direction but not a second direction when the spool is supported by the outer flanges. The outer flanges are slightly taller than the inner flanges such that the spool may be positioned on a flat surface (e.g., truck bed or ground) and unwound without any equipment.