Automatic Tie-Down Brake Control for Safe Strap Reeling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional tie-downs often reel straps at excessively high speeds in automatic mode, risking injury or damage, and existing brake mechanisms are indirect and sometimes ineffective in controlling the reeling speed.
Innovation Solution
A tie-down design featuring a frame with lateral plates, a reel with ratcheted wheels, a driving detent, a retaining detent, and a brake, where the brake is pivotally connected to the frame and initially in elastic contact with the ratcheted wheels to control the reeling speed, allowing direct access to disengage the brake for complete reeling in automatic mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the brake mechanism is indirect (as in prior art), then the device complexity is reduced, but the reliability of speed control deteriorates
Solution Approach 1:
The patent uses a cam as an intermediary element to directly control the brake. The cam profile is specifically designed to provide precise control over brake engagement and disengagement timing, ensuring reliable speed control during automatic reeling while maintaining a relatively simple overall device structure.
2Productivity
If the brake is disengaged for complete reeling, then the productivity is improved, but the safety deteriorates
Solution Approach 1:
The cam mechanism provides periodic control of the brake during the reeling cycle. The brake is engaged during the initial high-speed phase to control speed, then disengaged when the strap is fully reeled, creating a time-based sequence that ensures both safety and complete reeling operation.
Solution Approach 2:
The brake is engaged in advance before the reeling operation begins, preventing excessive speed during the initial phase. This preliminary braking action ensures safety is established before productivity concerns arise, and the brake is disengaged only after the strap is fully reeled.
3Object-affected harmful factors
If the brake remains engaged for safety, then the object-affected harmful factors are reduced, but the productivity deteriorates
Solution Approach 1:
The cam mechanism creates a periodic control pattern where the brake is engaged during the safety-critical initial phase and then disengaged to allow complete reeling. This time-based switching ensures that safety measures are applied only when necessary, maximizing productivity while maintaining safety.
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 ensures the strap is reeled at a proper speed, preventing injuries and damage while allowing complete reeling by directly engaging and disengaging the brake mechanism, providing a controlled and efficient reeling process.
Implementation Method 1
the brake is pivotally connected to the frame and normally in elastic contact with the ratcheted wheels
Implementation Method 2
The retaining detent is movable along the slits of the lateral plates and normally in elastic engagement with the ratcheted wheels
Data Source
AI summary
A tie-down includes a frame, a handle, a reel, a driving detent, a retaining detent and a brake. In a manual mode, the handle is pivoted back and forth on the frame to make the detents alternately engage with two ratcheted wheels of the reel to reel a strap. To switch the tie-down to an automatic mode, the handle is lifted to disengage the detents from the ratcheted wheels to allow a coil spring to rotate the reel to reel the strap. The brake is in contact with the ratcheted wheels to render the reeling at proper speed. The brake is directly movable away from the ratcheted wheels to allow the coil spring to further rotate the reel to completely reel the strap.