Cable tensioning system, mounting plate assembly, retraction cam, damper system and method for operating a system
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Solution Overview
Problem
Existing cable tensioning systems for leg rests in airplane seats face challenges in efficiently managing cable tension and stability during extension and retraction, leading to potential friction issues and reduced reliability.
Innovation Solution
A cable tensioning system incorporating a mounting plate assembly with a retraction cam and a spur body, featuring a cam body and a spur body that pivot against each other, along with a torsion spring and a tensioning spring, to manage cable tension and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cable tensioning system uses a retraction cam and spur body mechanism, then cable tension management is improved, but device complexity increases
Solution Approach 1:
The retraction cam mechanism is divided into separate components: a cam body, a spur body that pivots on the cam body, and a tensioning spring. This segmentation allows each component to perform its specific function independently while working together to manage cable tension effectively.
Solution Approach 2:
The spur body acts as an intermediary element between the cam body and the cable. It pivots on the cam body and guides the cable through its groove, mediating the force transmission and tension management while reducing direct friction between the cam body and cable.
2Object-affected harmful factors
If the spur body pivots on the cam body with a tensioning spring, then friction is reduced, but manufacturing complexity increases
Solution Approach 1:
The spur body is designed to pivot dynamically on the cam body rather than being fixed. This dynamic arrangement allows the spur body to rotate and adjust its position, reducing friction as the cable moves through its groove while the tensioning spring provides continuous tension.
Solution Approach 2:
The tensioning spring changes the tension parameter in the cable continuously, maintaining optimal tension levels that reduce friction during cable movement. The spring allows the system to adapt tension levels based on the operational state of the leg rest.
3Ease of operation
If the retraction cam is pivotable about a mounting point, then ease of operation is improved, but stability decreases
Solution Approach 1:
The cam body is pre-mounted on a fixed mounting point that provides stable support. This preliminary fixed mounting ensures stability while the cam body itself can pivot to enable the retraction motion, combining stability with operational flexibility.
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 manages cable tension, reduces friction, and enhances the reliability of leg rest extension and retraction, ensuring smooth operation and prolonged system lifespan.
Implementation Method 1
a tensioning spring secured to the cam body and the spur body and allowing the spur body to pivot on the cam body
Implementation Method 2
by a torsion spring a force to the retraction cam thereby pivoting the retraction cam
Data Source
AI summary
Embodiments provides a cable tensioning system comprising a mounting plate assembly with a mounting plate and a retraction cam mounted to the mounting plate and configured to pivot about a primary axis, wherein the retraction cam comprises a cam body and a spur body having a cable sheave groove, wherein the mounting plate assembly is fixedly secured to a mounting fixture of a leg rest of a seat, and wherein the cable sheave groove is configured to receive a cable fixed to extension frame of the leg rest, the extension frame being movable relative to the mounting fixture.