Cable Drum Tensioner With Angular Displacement Slack Detection

Solution Overview

Problem

Movable barrier systems, such as garage doors, face issues with slack cables due to obstruction, jamming, or dislodgement from guide rails, leading to operational failures, structural damage, and potential injury, with existing solutions failing to effectively detect and prevent such slack cables.

Innovation Solution

A movable barrier system that allows for angular displacement between a torsion tube and a cable drum, equipped with sensors to detect changes in angular displacement or force, and a controller to stop rotation when a threshold is reached, along with a displacement coupler to prevent slack cables.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the cable drum is rigidly connected to the torsion tube, then the structural stability is improved, but the slack cable detection capability deteriorates

Engineering Contradiction:

Improvestructural stabilityVSAvoidslack cable detection capability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The cable drum is made rotatable relative to the torsion tube, allowing dynamic adjustment of its position. This enables the system to detect angular displacement between the cable drum and torsion tube, which indicates slack cable conditions, while maintaining operational stability during normal operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A sensor is introduced to detect angular displacement between the cable drum and torsion tube, providing feedback to the controller. When displacement exceeds a threshold, the controller stops motor rotation, enabling real-time monitoring and prevention of slack cable issues.

Inventive Principle:

Principle #23Feedback

2Reliability

If the cable drum is allowed to rotate freely, then the slack cable detection capability is improved, but the mechanical stability deteriorates

Engineering Contradiction:

Improveslack cable detection capabilityVSAvoidmechanical stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The cable drum is made rotatable relative to the torsion tube, allowing dynamic adjustment of its position. This enables the system to detect angular displacement between the cable drum and torsion tube, which indicates slack cable conditions, while maintaining operational stability during normal operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A sensor is introduced to detect angular displacement between the cable drum and torsion tube, providing feedback to the controller. When displacement exceeds a threshold, the controller stops motor rotation, enabling real-time monitoring and prevention of slack cable issues.

Inventive Principle:

Principle #23Feedback

3Productivity

If the motor continues to rotate the torsion tube, then the productivity is improved, but the slack cable problem worsens

Engineering Contradiction:

Improvebarrier operation speedVSAvoidcable tension stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A sensor is introduced to detect angular displacement between the cable drum and torsion tube, providing feedback to the controller. When displacement exceeds a threshold, the controller stops motor rotation, enabling real-time monitoring and prevention of slack cable issues.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary detection of angular displacement before slack cable conditions develop into serious problems. By monitoring the angle between the cable drum and torsion tube continuously, the system can stop motor rotation in advance to prevent cable slackening and potential failure.

Inventive Principle:

Principle #10Preliminary action

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 system effectively detects and prevents slack cables, enhancing predictability, durability, and operability by preventing sudden closure and reducing mechanical issues.

Implementation Method 1

a sensor configured to detect an angular displacement or a force between the torsion tube and the cable drum and send a signal when the angular displacement or the force changes

Methodology Applied

Scientific EffectAngular displacement detection:

Data Source

PatentUS20260002399A1Cable drum cable tensioner and methods in a movable barrier system

Publication Date: 2026.01.01 GMI HOLDINGS INC

AI summary

A movable barrier system for operating a movable barrier may include a torsion tube configured to rotate and a cable drum comprising a cable connectable to the movable barrier. The cable drum may be configured to rotate relative to the torsion tube. The movable barrier system may further include a sensor configured to detect the angular displacement or a force between the torsion tube and the cabled drum and send a signal when the angular displacement or the force changes. The movable barrier system may further include a controller in communication with the sensor and configured to stop rotation of the torsion tube in response to the signal.