Cargo Strap Tensioner Frame and Crank for Secure Winding
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Solution Overview
Problem
The existing worm-type cargo strap tensioners have a weak U-shaped frame prone to deformation, lack visibility for ensuring proper strap winding, require excessive labor due to fixed crank length, and have a stopper with a slot that is easily deformed and misaligned, leading to inefficiencies in securing cargo.
Innovation Solution
A reinforced U-shaped frame with a bridge bar, an L-shaped stopper, a pivoted crank with adjustable length, and an observation hole for monitoring strap winding, along with an optional nut for electric or manual operation to enhance strength, visibility, and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a U-shaped frame without support between top ends is used, then the structure is simple, but the frame is weak and easy to be deformed by collision
Solution Approach 1:
The frame is segmented by adding a bridge bar that divides the top portion into two separate support regions, providing structural reinforcement without significantly increasing overall complexity
Solution Approach 2:
The bridge bar extends in a new dimension (horizontally connecting the two sidewalls), adding structural support in a direction perpendicular to the original vertical walls, thereby strengthening the frame against lateral collisions
2Device complexity
If no observation hole is provided on the sidewall, then the structure remains simple, but the wound strap cannot be observed or detected
Solution Approach 1:
The observation hole allows visual detection of the strap winding state through the sidewall, enabling users to monitor strap tension and positioning without disassembling or modifying the tensioning mechanism
3Device complexity
If a crank with fixed effective length is used, then the structure is simple, but much labor is needed to rotate the crank
Solution Approach 1:
The crank arm is made dynamically adjustable in length, allowing the user to extend the effective lever arm during operation to reduce rotational effort, then fold it for compact storage when not in use
4Device complexity
If a stopper with a slot is used to restrain the handle, then the structure is simple, but the stopper is easy to be deformed by collision and the locking bar may not be aligned with the slot
Solution Approach 1:
The stopper uses an L-shaped asymmetric structure with a perpendicular blocking surface that provides a larger, more robust stopping area, eliminating the alignment sensitivity and deformation issues associated with narrow slots
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 strengthens the frame, reduces labor through adjustable crank length, and prevents stopper deformation, ensuring secure and efficient cargo strap tensioning.
Implementation Method 1
a gear assembly, mounted on the first sidewall, having a worm and a worm gear engaging with the worm
Data Source
AI summary
A strap tensioner includes a frame, a bridge bar, a stopper, a winding shaft, a gear assembly, a crank and an observation hole. The frame has two sidewalls. The bridge bar is fixed between the two sidewalls. The stopper is of an L-shape and extends from one of the sidewalls. The gear assembly is mounted on the other sidewall and has a worm and a worm gear. The worm gear is axially connected to the winding shaft. The worm is provided with a drive shaft. The crank includes a stem connected to the drive shaft, an arm pivotedly connected to the stem and being capable of being either expanded along the stem or folded over the stem, and a handle on the arm. The observation hole is formed in the sidewall. The handle is blocked by the stopper when the arm is folded over the stem.