Rotatable Hook Assembly for Tool-Free Chain Tensioner Orientation
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Solution Overview
Problem
Existing chain tensioners lack the ability to rotate and lock their hooks into multiple orientations without requiring tools, which is a requirement for secure cargo transport as specified by the U.S. Department of Defense.
Innovation Solution
A chain tensioner design incorporating a frame, locking body, threaded receiver, locking plate, biasing element, and threaded shaft, allowing the hook to be swiveled and locked into multiple orientations by translating and rotating the locking plate within the cavity, enabling tool-free orientation changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hook is made fixed in position, then the structure is simple and reliable, but the hook cannot be rotated into multiple orientations
Solution Approach 1:
The hook assembly transitions from a fixed state to a dynamic, rotatable state. The hook is connected to the frame through a rotatable connection that allows it to swing between multiple orientations (e.g., 0 degrees, 90 degrees, 180 degrees, 270 degrees). This dynamic capability enables the hook to adapt to different cargo securing needs while maintaining structural integrity through the locking mechanism.
Solution Approach 2:
A locking mechanism acts as an intermediary between the hook's rotational freedom and the frame's stability. This mechanism includes a locking member that can engage with locking surfaces on the hook, preventing rotation when locked and allowing rotation when unlocked. The intermediary locking mechanism resolves the contradiction by providing controlled mobility rather than complete freedom or complete fixation.
2Adaptability or versatility
If a locking mechanism is added to enable rotation, then the hook can be secured in multiple orientations, but the device complexity increases
Solution Approach 1:
The locking mechanism is designed to be self-operating without requiring external tools. The hook itself or an integrated actuator serves as the locking device. When the hook is rotated to a desired orientation, it automatically engages with the locking mechanism through its own movement, or a simple manual actuation on the hook releases or engages the lock. This self-service approach maintains ease of operation while enabling multi-orientation capability.
Solution Approach 2:
The locking function is merged with the hook structure itself rather than being a separate, complex external mechanism. The locking surfaces, locking members, and actuation elements are integrated into the hook assembly, combining the functions of connection, rotation, and locking into a single unified component. This merging reduces overall device complexity while maintaining the required functionality.
3Reliability
If the locking mechanism is made robust to prevent unintended releases, then the cargo securing is more reliable, but the release operation becomes more difficult
Solution Approach 1:
The locking mechanism incorporates preliminary anti-action features that prevent unintended releases before they can occur. This includes positive locking engagement with mechanical interference fit, overload protection mechanisms that prevent accidental disengagement under load, and design features that require intentional, deliberate action to release. The system is designed to resist unintended release forces while remaining susceptible to intentional release commands.
Solution Approach 2:
The system prepares for release in advance by maintaining a ready-state mechanism. The locking mechanism is designed so that the release function is pre-positioned and requires minimal action to activate. For example, a release lever or button is held in a ready position that can quickly transition to the unlocked state with a simple manual motion, allowing rapid release when needed without requiring complex disassembly or multiple steps.
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 design allows for secure cargo transport by enabling the hook to be swiveled and locked into multiple orientations without tools, ensuring secure tensioning and quick release functionality, reducing the risk of unintended releases.
Implementation Method 1
a biasing element, and a threaded shaft. The biasing element is in contact with the locking plate
Data Source
AI summary
Aspects of the invention are directed to an apparatus that may be used as a chain tensioner. The apparatus comprises an attachment element, such as a hook, that is rotatably coupled to a locking plate. In use, the apparatus is operative to take on a plurality of locked states and an unlocked state. Each of the plurality of locked states is characterized by the locking plate being pressed into a cavity of a locking body in a manner that prevents the locking body, and, by extension, the attachment element from rotating. The unlocked state is characterized by the locking plate being outside the cavity, and thereby free to rotate. The attachment element is therefore capable of being swiveled between, and locked into, multiple orientations.