Rigid Brake Tether With Pulley Arm for Stable Tree Climbing
Solution Overview
Problem
Existing tree climbing rope systems with flexible tethers suffer from instability due to misalignment of components, moisture absorption, and increased energy expenditure caused by loss of rigidity, leading to suboptimal performance.
Innovation Solution
A rigid tether system with a handle, pulley arm, and friction brake design that maintains component alignment and stability, utilizing a torsion spring and pulley mechanism to ensure optimal engagement and reduce energy consumption during climbing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible tether is used to connect the friction brake and pulley, then the system allows movement and flexibility, but the components become misaligned and unstable due to tether flex
Solution Approach 1:
The tether is divided into multiple rigid segments (first rigid portion, second rigid portion) connected by a hinge joint. This segmentation allows the tether to adapt to movement while maintaining alignment stability within each rigid segment, resolving the contradiction between flexibility and stability.
Solution Approach 2:
The hinge joint introduces dynamic capability to the rigid tether, allowing it to pivot and adapt to changing positions during climbing operations. This dynamic feature enables the tether to maintain component alignment while accommodating movement, resolving the stability-flexibility contradiction.
2Adaptability or versatility
If a textile tether made from cordage is used, then the system is flexible and adaptable, but the tether absorbs moisture and debris causing progressive loss of rigidity
Solution Approach 1:
The material parameter of the tether is changed from flexible cordage to rigid material (such as aluminum alloy). This parameter change eliminates moisture absorption and rigidity loss while maintaining system adaptability through the hinge joint mechanism, resolving the contradiction between flexibility and reliability.
3Ease of operation
If the tether is made longer to avoid restricting friction brake pivoting, then the friction brake has more movement freedom, but the tether easily twists around the climbing rope
Solution Approach 1:
The tether is segmented into rigid portions with a hinge joint, creating a structured configuration that prevents twisting around the rope while providing sufficient movement freedom for the friction brake through the hinge's pivoting capability.
Solution Approach 2:
The hinge joint acts as an intermediary between the rigid tether portions, mediating the movement to provide friction brake freedom while preventing the tether from twisting around the climbing rope through controlled pivoting motion.
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 rigid tether system enhances stability and reduces energy expenditure by maintaining component alignment and preventing moisture absorption, resulting in improved climbing efficiency and safety.
Implementation Method 1
The pulley is mounted to spin on the axle. The fixed plate, gate plate, pulley, and handle define a rope slot.
Implementation Method 2
A rigid tether system with a handle, pulley arm, and friction brake design that maintains component alignment and stability, utilizing a torsion spring and pulley mechanism to ensure optimal engagement
Data Source
AI summary
A rigid tether for use with a friction brake. The tether has a rigid handle with a brake hole at one end designed for mounting a friction brake to rotate about the brake hole. A pulley arm with pulley is attached to rotate about the other end of the handle. The pulley arm is two parallel plates, a fixed plate and a gate plate, with an axle between them on which is mounted the pulley. The plates, pulley, and handle define a rope slot. The gate plate can pivot on the axle to provide access to the rope slot.