Dual Hook Strap Attachment for Large Anchor Reliability
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Solution Overview
Problem
Existing strap tensioning devices face limitations with S-hooks, J-hooks, and carabiners in terms of anchor capacity, structural vulnerability, and secure attachment, particularly when dealing with webbing and large diameter anchors, and require additional loops or D-rings for secure attachment.
Innovation Solution
A dual hook attachment device with spring-biased hooks that can be selectively attached to a sewn end loop, providing secure and robust attachment to fixed anchors without additional loops, and functioning as a static pulley, mimicking the convenience of S-hooks while avoiding the vulnerabilities of carabiners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If S-hooks are used for strap termination, then ease of operation is improved, but reliability is worsened due to structural vulnerability and inability to securely attach to large diameter anchors
Solution Approach 1:
The device divides the attachment function into two separate hooks instead of one S-shaped hook. Each hook independently engages with the anchor, providing redundancy and improved reliability while maintaining the simple S-hook operation style.
Solution Approach 2:
The two hooks are nested within a single housing structure, creating a compact device that functions like a double-hook S-hook. The hooks are positioned one behind the other, allowing them to work together to secure the strap to large diameter anchors.
2Reliability
If additional loops or D-rings are added to straps for secure attachment, then reliability is improved, but device complexity is worsened
Solution Approach 1:
The device combines two hooks and their housing into a single integrated attachment device that replaces the need for separate loops or D-rings. This merging provides secure attachment capability while reducing the number of separate components the user must manage.
Solution Approach 2:
The dual hook device serves multiple functions: it provides secure attachment to large diameter anchors, maintains simplicity of use like S-hooks, and eliminates the need for additional loops or D-rings. This multi-functionality resolves the contradiction by providing reliability without increasing user-facing complexity.
3Reliability
If carabiners with lock gates are used, then reliability is improved through secure locking, but structural vulnerability is worsened due to twisting action and side loading
Solution Approach 1:
The device segments the locking function across two independent hooks rather than relying on a single lock gate mechanism. This distribution of function reduces the structural vulnerability to twisting and side loading that plagues carabiner designs.
Solution Approach 2:
The device extracts the problematic lock gate mechanism from carabiners and replaces it with simple hook engagement. The hooks rely on their geometry and the housing structure for security rather than a separate locking component, eliminating the structural vulnerability to twisting forces.
4Adaptability or versatility
If J-hooks with perpendicular orientation are used, then anchor capacity is improved, but ease of operation is worsened compared to S-hooks
Solution Approach 1:
The device uses symmetric S-shaped hooks rather than the asymmetric J-hook design. This symmetry allows the hooks to be oriented parallel to the strap plane like traditional S-hooks, maintaining ease of operation while the dual-hook configuration provides the anchor capacity of perpendicular orientations.
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 offers secure, reliable attachment to large diameter anchors, withstands torque and side loading, and allows strap movement without damage, maintaining structural integrity and load-bearing capacity, similar to S-hooks but with enhanced security and convenience.
Implementation Method 1
Two springs (170) are located internal to the housing (130) and bias the two hooks (110) toward a closed position (211).
Data Source
Figure 1
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AI summary
An attachment device includes a first hook and a second hook, the first and second hook, the first and second hook biased towards each other and interconnected with each other, such the first and second hook have a first position, where a first curved end of the first hook does not touch a second curved end of the second hook and a second position, where the first curved end of the first hook does touch the second curved end of the second hook.