Adjustable Lever Load Binder Rotating Jaw Cam Mechanism
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Solution Overview
Problem
Existing adjustable lever load binders lack the capability for fine adjustments in tiedown chain length, leading to time-consuming and intricate installation processes, potential twisting of components, and increased force requirements due to over center designs, which compromise efficiency and safety.
Innovation Solution
The design incorporates a rotating jaw and adjustment nut with a compression spring to allow precise chain length adjustments without twisting, and a cam/follower arrangement to reduce operational torque and prevent kickback, ensuring efficient and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an over center binder design is used to generate additional locking torque, then the locking reliability is improved, but the force required to rotate the lever during release increases significantly
Solution Approach 1:
The patent inverts the traditional over-center mechanism by positioning the cam follower below the line of tension rather than above it. This inversion maintains the self-locking capability through cam geometry while eliminating the additional torque that opposes lever rotation during release, thereby reducing the force required by the operator.
2Device complexity
If a fixed orientation lever load binder is used, then the structural simplicity is maintained, but the capability to accommodate chain length adjustments is reduced
Solution Approach 1:
The patent introduces a rotating jaw mechanism that allows the chain receiving element to rotate about the line of tension. This dynamic adjustment capability enables the binder to accommodate variations in chain length and link orientation without requiring complex reconfiguration, while maintaining relatively simple structural integration with the fixed lever body.
3Manufacturing precision
If the tiedown chain is adjusted by a single link, then the precision of chain length adjustment is improved, but the risk of twisting the tiedown chain or lever load binder increases
Solution Approach 1:
The rotating jaw mechanism allows the chain to be adjusted in single link increments while accommodating the 90-degree orientation change between adjacent links through rotation about the line of tension. This dynamic adjustment prevents twisting of the chain and binder components by aligning the jaw with the proper link orientation before engagement.
4Force
If a cam/follower arrangement with the cam axis on the line of tension is used, then the operational torque is reduced, but the design complexity increases
Solution Approach 1:
The cam mechanism serves multiple functions: it provides the mechanical advantage to reduce operational torque during lever rotation, maintains the follower on the line of tension through geometric constraint, and works in conjunction with the rotating jaw to enable precise chain adjustment. This multi-functionality justifies the added complexity by delivering multiple benefits from a single integrated mechanism.
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 solution enables quick, precise, and safe adjustments of tiedown chain length, reducing the risk of component twisting and handle kickback, thereby enhancing the efficiency and safety of cargo securement during transportation.
Implementation Method 1
an adjustment nut with a compression spring
Implementation Method 2
a cam/follower arrangement to reduce operational torque and prevent kickback
Data Source
AI summary
A lever load binder which provides fine adjustments for accommodation of the length of the tiedown chain without twisting of the tiedown chain or binder, increased efficiency of use, and improved safety.