Multi-Arc Brake Disc for Rope Brakes With Higher Wrap Angle
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Solution Overview
Problem
Existing rope brakes struggle to effectively secure climbers with larger mass differences between the climber and belayer, as they fail to adequately manage the kinetic energy and friction during a fall, leading to inadequate control and potential safety issues.
Innovation Solution
A brake disc with a unique design featuring multiple circular arcs and a wave-shaped cable channel is integrated into the rope brake system, increasing the lever arm and wrap angle, which enhances the rope brake's ability to manage kinetic energy and friction, thereby improving the system's responsiveness and capacity to handle larger weight differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circular brake disc is used in a rope brake system, then the structure is simple and easy to manufacture, but the lever arm is insufficient and the wrap angle is limited, making it difficult to secure climbers with larger mass differences
Solution Approach 1:
The brake disc uses a non-circular design with multiple circular arcs of different radii instead of a simple circular shape. This curved geometry increases the wrap angle of the rope around the disc and extends the lever arm, thereby improving the friction force and the ability to secure climbers with larger mass differences while maintaining a relatively simple manufacturable structure.
Solution Approach 2:
The invention changes the geometric parameters of the brake disc by using multiple circular arcs with different radii (first radius R1, second radius R2 where R2 > R1, and optionally third radius R3 where R3 < R1). This parameter variation optimizes the wrap angle and lever arm length, enhancing the mechanical advantage and friction characteristics of the rope brake system.
2Speed
If the brake disc engages quickly to increase responsiveness, then the impact force on the belayer is reduced, but the friction and heat generation during the fall increase
Solution Approach 1:
The patent converts the potentially harmful impact force into beneficial friction energy. By designing the brake disc geometry to increase the wrap angle, the system generates higher friction forces that dissipate the climber's kinetic energy more gradually through controlled rubbing, transforming the harmful sudden impact into a beneficial energy dissipation process that protects the belayer.
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 enhanced brake disc design allows for faster engagement and increased friction, reducing the impact force on the belayer and improving the control of the fall, enabling safer securing of climbers with greater mass differences.
Implementation Method 1
the friction in the rope brake system converts the kinetic energy into heat and, if necessary, other forms of energy
Implementation Method 2
a portion of the arresting force can be decoupled from the rope via the rope brake in the form of friction
Data Source
Figure 1A~1C
Figure 2
Figure 3
AI summary
The invention described herein relates to a brake disc for a rope brake for rope climbing, the brake disc comprising: a first section for supporting a rope on the brake disc, wherein the first section is a first arc of a first circle with a first radius; and a second section for supporting the rope on the brake disc, wherein the second section is arranged adjacent to the first section; wherein the brake disc is characterized in that the second section is a second arc of a second circle with a second radius, the second radius being larger than the first radius. The invention further relates to a rope brake for rope climbing with the brake disc and a method for retrofitting a rope brake with the brake disc.