Locking Sleeve Mechanism for Vibration-Resistant Cable Adjuster
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Solution Overview
Problem
Cable adjusters, particularly those using jam nuts, often experience reduced locking force over time due to vibrations, leading to changes in cable tautness and length, which can adversely impact the operating efficiency of associated machinery.
Innovation Solution
A control cable assembly featuring a male-threaded and female-threaded portion with securing devices and a locking sleeve that can be displaced between engagement and disengagement positions, preventing rotation of the threaded portions when locked and allowing adjustment without the need for wrenches, utilizing a biasing member to maintain the locking position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a jam nut is used to lock the cable adjuster, then the cable adjuster can be maintained at a particular length, but the locking force is reduced over time due to vibrations, causing the jam nut to become loose
Solution Approach 1:
The locking mechanism transitions from a static jam nut to a dynamic system where the locking sleeve can move between locked and unlocked positions. The biasing member provides continuous dynamic force to maintain engagement, allowing the system to adapt to vibrational forces rather than simply resisting them passively.
Solution Approach 2:
The locking sleeve acts as an intermediary component between the adjustable portion and the fixed portion. It mediates the locking function by engaging with the securing device on the adjustable portion, isolating the main cable adjuster mechanism from direct vibrational loosening forces.
2Reliability
If a jam nut is used to lock the cable adjuster, then the cable adjuster can be maintained at a particular length, but wrenches are required to tighten/untighten the jam nut, making adjustments complex
Solution Approach 1:
The locking sleeve is designed to be manually operable without external tools. The user can directly engage or disengage the locking sleeve by hand, and the biasing member automatically maintains the locked position, eliminating the need for wrenches or other adjustment tools.
Solution Approach 2:
The adjustment and locking functions are segmented into independent operations. The adjustable portion can be modified independently by rotating the female-threaded portion, while the locking sleeve provides a separate, simplified locking operation that does not require undoing previous adjustments.
3Reliability
If the locking sleeve engages the securing devices, then rotation of the threaded portions is prevented, but the structure becomes more complex
Solution Approach 1:
The locking sleeve performs multiple functions within a single component: it engages with the securing device to prevent rotation, provides visual and tactile indication of locked state through its position, and works with the biasing member to maintain continuous engagement force. This multi-functionality reduces the need for separate components for each function.
Solution Approach 2:
The locking sleeve is positioned over the adjustable portion in a nested configuration, with the securing device on the adjustable portion fitting within the locking sleeve. The biasing member is nested within the locking mechanism, providing force from within the existing structure rather than requiring external components.
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 assembly effectively maintains cable tautness and length, preventing loosening due to vibrations, and allows for easy and quick adjustments without tools, providing a secure locking mechanism and visual/tactile indication of the locked state.
Implementation Method 1
a biasing member positioned within the locking sleeve between the partition and a flange of the male-threaded portion
Data Source
AI summary
An assembly for adjusting a cable that includes a locking sleeve and an adapter that is connected to the cable. The adapter includes male and female-threaded portions that are coupled together. The locking sleeve is configured to be displaced between engagement and disengagement positions. When in the engagement position, securing devices of the male and female-threaded portions engage inner sections of the locking sleeve in a manner that prevents the male and female-threaded portions from being rotated relative to each other, thereby preventing a change in the length of the adapter so as to prevent an adjustment of the cable. When the cable is to be adjusted, the locking sleeve is displaced to disengagement position such that the securing device of either the male or female-threaded portion is disengaged from the locking sleeve, thereby allowing rotation of the male or female-threaded portions relative to each other.