Cable Reel Brake Wheel and Latch for Low-Impact Winding Stop
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Solution Overview
Problem
Existing cable drum braking systems for automatic winding are prone to errors due to sensitivity to external influences like high temperatures or wetting with fat, and they can experience high recoil forces leading to deformations and hard impacts.
Innovation Solution
A two-stage braking system with a brake wheel that engages in an indentation on a connecting link, featuring a blocking element that prevents unintentional winding, and a design that allows for gentle deceleration and low-force blocking, including a bevel and wedge mechanism for secure engagement and easy release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brake lever system with a rubber element is used to prevent automatic winding, then the cable drum can be braked, but the system becomes sensitive to external influences like high temperatures or wetting with fat, leading to errors
Solution Approach 1:
The patent replaces the friction-based rubber element brake system with a mechanical latching system using a latching element that engages with a stop through a link track. This substitution eliminates the sensitivity to external influences like temperature and fat wetting that affect friction-based systems, providing more reliable braking performance.
Solution Approach 2:
The patent introduces a link track as an intermediary mechanism between the latching element and the stop. This link track allows controlled engagement and disengagement while distributing forces, preventing direct impact and reducing deformations. The link track acts as a mediator that smooths the braking action.
2Reliability
If latching elements are directed against a stop via a link track to prevent automatic winding, then the cable drum can be braked, but deformations occur due to high forces when the latching element impacts
Solution Approach 1:
The patent designs the link track with a geometry that allows gradual engagement of the latching element with the stop, rather than direct impact. The link track acts as a cushioning mechanism that distributes the impact force over time and space, preventing sudden high-force impacts that would cause deformations to the brake lever or other components.
Solution Approach 2:
The patent employs a dynamic link track mechanism that allows the latching element to engage the stop in a controlled manner. The link track geometry enables the system to adapt the engagement force, transitioning from a static direct-impact design to a dynamic controlled-engagement design that reduces peak forces and prevents structural damage.
3Object-affected harmful factors
If the coefficient of friction between the brake wheel and connecting link is reduced due to fat ingress, then the brake wheel may slide out of the indentation, but this creates a risk of unintentional winding
Solution Approach 1:
The patent divides the braking function into two independent stages: a first braking system using a brake wheel for deceleration, and a second blocking system using a blocking element and catching part for preventing unintentional winding. This segmentation ensures that if the friction-based brake wheel fails due to fat ingress, the second mechanical blocking system provides a backup to maintain braking reliability.
Solution Approach 2:
The patent designs the two-stage system where the first brake wheel provides preliminary deceleration and positioning, cushioning the transition to the second blocking stage. This ensures that when the blocking element engages the catching part, it does so with reduced forces, preventing damage while maintaining reliability even if the first stage's friction is compromised.
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 provides a reliable braking system that avoids high recoil forces and maintains functionality even when the coefficient of friction is reduced, ensuring the cable drum is securely blocked without hard impacts, enhancing reliability and safety.
Implementation Method 1
the coefficient of friction between the brake wheel, which is preferably made of rubber, and the connecting link
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a cable drum for automatically winding up a cable, having an inner drum part (2), an outer drum part (1) and a backplate (3). A hollow-cylindrical guide track (23) is formed on the inner drum part (2) and has at least one concavity (24) which is introduced into its inner wall. A brake lever (6) is mounted in a radially displaceable manner on the backplate (3) and has at least one slot (63) in which the axle (71) of a braking wheel (7), which projects into the guide track (23) and rests against the inner wall thereof, is guided. The at least one slot (63) is positioned at an angle such that the braking wheel (7), when rotating the guide track (23) in the winding-up direction of the cable drum, is pressed against the inner wall of the guide track (23). A blocking element is arranged on the braking lever (6) downstream of the braking wheel (7), as seen in the winding-up direction of the cable drum, and said blocking element interacts with at least one intercepting part, arranged on the inner drum part (2), such that said braking wheel is blocked only upon passage of the intercepting part in the winding-up direction of the cable drum.