Compact Tensioning Assembly With Torque-Limiting Clutch
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Solution Overview
Problem
Conventional tensioning devices, such as come-a-longs and turn buckles, are bulky and cumbersome, making them difficult to use in confined spaces and often result in inconsistent tension control, leading to overtightening or under tightening.
Innovation Solution
A compact tensioning device with a housing assembly, drive stem, clutch assembly, and driven member that allows for precise tension adjustment by rotating the drive member, which is decoupled from the drive stem when a predetermined torque is reached, ensuring consistent tension application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional tensioning devices (come-a-longs and turn buckles) are used, then tensioning function is achieved, but the device becomes bulky and cumbersome for use in confined spaces
Solution Approach 1:
The tensioning device is divided into separate functional components: a drive member with drive stem, a driven member with cable spool, and a clutch assembly. This segmentation allows each component to be optimized independently and assembled in compact configurations suitable for confined spaces while maintaining full tensioning functionality.
Solution Approach 2:
The cable spool is nested within the driven member housing, and the clutch assembly is integrated within the drive member structure. This nesting arrangement minimizes the overall device volume by placing components within the internal cavities of other components, enabling compact deployment in confined spaces.
2Measurement precision
If conventional tensioning devices are used, then tensioning is achieved, but tension control is difficult resulting in overtightening or under tightening
Solution Approach 1:
The clutch assembly provides automatic feedback control by engaging and disengaging based on the tension applied to the cable. When the cable reaches the desired tension, the clutch automatically disengages to prevent overtightening. This feedback mechanism eliminates the need for manual tension estimation and ensures consistent, precise tension control.
Solution Approach 2:
The clutch assembly is designed to automatically regulate tension without requiring operator intervention or judgment. The mechanism self-adjusts by mechanically sensing the tension state and controlling the cable payout accordingly, making tension control precise and eliminating the difficulty of manual tension adjustment.
3Volume of moving object
If a compact design is implemented, then device size is reduced, but structural complexity increases with multiple assemblies
Solution Approach 1:
The drive member and driven member are designed as integrated assemblies with the clutch mechanism built into the drive member structure. The cable spool is integrated within the driven member housing. These merging strategies reduce the number of separate components and simplify the overall structure, achieving compact size without excessive complexity.
4Reliability
If precise tension control is achieved through decoupling mechanism, then overtightening is prevented, but device complexity increases
Solution Approach 1:
The clutch assembly acts as an intermediary mechanism between the drive member and driven member. It provides a simple mechanical interface that automatically engages or disengages based on tension requirements, preventing overtightening through a straightforward decoupling action rather than complex control systems.
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 device provides controlled tensioning in confined spaces with precise adjustment, preventing overtightening or undertightening, and includes sensors for monitoring operational parameters, enhancing usability and safety.
Implementation Method 1
The cable spool can rotate relative to the housing to wind or unwind the cable
Implementation Method 2
The drive member is decoupled from the drive stem when a predetermined torque is reached
Data Source
AI summary
A tensioning device includes a housing, a drive member, a sleeve and a driven member. The housing includes a first attachment feature. The driven member includes a second attachment feature. The sleeve is rotatably coupled with the housing. The drive member is rotatably coupled with the housing and is operably coupled with the sleeve such that rotation of the drive member facilitates rotation of the sleeve. The driven member is movable with respect to the guide member between a retracted position and an extended position.