Automatic Take-up Coupler for Wood Shrinkage Compensation
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Solution Overview
Problem
Wood-framed building tie-down systems face tension loss due to wood shrinkage, leading to potential damage during earthquakes, floods, and high winds, as existing manual adjustment methods are costly and inefficient.
Innovation Solution
An automatic take-up coupler with a torsion spring mechanism that connects threaded rods, allowing for adjustable tension maintenance and reducing system length to compensate for shrinkage and settlement, featuring a surrounding sleeve and rotational members with internal threads for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual turnbuckles are used to tighten cables, then tension can be restored after wood shrinkage, but the process becomes expensive and inefficient requiring building panel removal
Solution Approach 1:
The patent employs an automatic take-up device that self-adjusts cable tension without manual intervention. The device includes a ratchet mechanism and take-up spool that automatically wind the cable when tension is lost due to wood shrinkage, eliminating the need for manual turnbuckle adjustment and building panel removal.
Solution Approach 2:
The patent replaces the manual mechanical turnbuckle system with an automatic mechanical take-up device featuring a ratchet and spool mechanism. This substitution transforms the manual adjustment process into an automatic system that maintains tension continuously without human operation.
2Extent of automation
If automatic take-up devices are implemented, then tension maintenance becomes automated, but device complexity increases
Solution Approach 1:
The patent divides the automatic take-up function into distinct modular components: a take-up spool for cable winding, a ratchet mechanism for one-way engagement, and a coupling body for integration with existing rod ends. This segmentation allows each component to perform its specific function independently, simplifying the overall design and maintenance.
Solution Approach 2:
The patent integrates the automatic take-up mechanism within the existing rod end structure. The take-up spool and ratchet mechanism are housed within the coupling body, nesting the automatic adjustment function within the structural member it protects, thereby reducing overall system footprint and complexity.
3Ease of manufacture
If in-line couplers are used to connect rod ends, then installation is simplified, but frictional resistance increases reducing take-up efficiency
Solution Approach 1:
The patent incorporates a rotational member that rotates during the take-up process to wind the cable onto the spool. This dynamic rotation minimizes frictional resistance by maintaining optimal contact surfaces between moving parts, whereas static in-line couplers would create higher friction. The rotational mechanism allows smooth cable winding with reduced energy loss.
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 coupler effectively maintains tension in wood-framed building tie-down systems, reducing the need for manual adjustments and preventing damage from oscillating forces by compensating for up to one inch of shrinkage or settlement, while being compact, inexpensive, and easy to install.
Implementation Method 1
a torsion spring operatively connecting the first rotational member and the surrounding sleeve and biasing the first rotational member and the surrounding sleeve in opposite rotational directions
Data Source
AI summary
A tension connection for a building includes a first tension member, the first tension member being anchored at its distal end, a second tension member being anchored at its distal end; the first and second tension members being disposed in close proximity and connected by a coupler having a surrounding sleeve and a central bore with a thread, the coupler also being formed with a first rotational member being received in the central bore of the surrounding sleeve and operatively connected to the surrounding sleeve; the first rotational member is connected to the surrounding sleeve, such that the rotational member can rotate in relation to the surrounding sleeve. A torsion spring connects the first rotational member and the surrounding sleeve; the torsion spring biasing the first rotational member and the surrounding sleeve in opposite rotational directions such that the first rotational member can be drawn into the surrounding sleeve.