Carabiner Hook Lever Geometry for Easy Cable-Side Actuation
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Solution Overview
Problem
Existing carabiner hooks, particularly for via ferrata climbing, are difficult to operate due to the need for fingers to directly contact a steel cable when actuating the closing lever, and the design of additional levers complicates intuitive operation.
Innovation Solution
The carabiner hook design features a significant distance between the actuating pin and actuating lever pivot, at least three times greater than the distance between the actuating pin and closing lever pivot, allowing for a small actuating lever pivoting angle to achieve a large closing lever pivoting angle, with the actuating lever and closing lever on the same side of the main body, and a retaining part on the opposite side, enhancing intuitive operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the closing lever is made as long as possible to avoid finger contact with steel cable, then safety is improved, but the lever becomes harder to actuate and operation becomes more difficult
Solution Approach 1:
An actuating lever is introduced as an intermediary component between the user's fingers and the closing lever. The actuating lever pivots on the hook-shaped main body and transmits force to pivot the closing lever, allowing users to operate the long closing lever without direct finger contact with the steel cable or the main body.
2Ease of operation
If an actuating lever is added to pivot the closing lever, then ease of operation is improved, but the device complexity increases
Solution Approach 1:
The actuating lever is merged with the hook-shaped main body through a shared pivot point. The actuating lever pivots directly on the main body, and its movement is transmitted through the closing lever pivot to control the closing lever, creating an integrated mechanism rather than separate independent components.
3Ease of operation
If the distance between actuating pin and actuating lever pivot is made large, then the actuating lever requires smaller pivoting angle improving ease of operation, but the actuating pin travels farther in the slotted actuating hole increasing friction
Solution Approach 1:
The orientation and dimensions of the slotted actuating hole are optimized to accommodate the required pin travel distance while minimizing friction. The slot is positioned and dimensioned to allow the actuating pin to move through the necessary range with reduced contact resistance, balancing the leverage advantage with acceptable friction losses.
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
This design enables easy and intuitive actuation of the closing lever with reduced friction, ensuring stable retention and minimal force expenditure, while protecting against abrasion and noise.
Implementation Method 1
the actuating lever has to be moved only slightly to fully pivot the closing lever
Implementation Method 2
a distance between the actuating pin and the actuating lever pivot is at least three times, preferably at least five times, greater than a distance between the actuating pin and the closing lever pivot
Implementation Method 3
reduced friction
Data Source
AI summary
Carabiner hook having a hook-shaped main body, a closing lever, a retaining part and an actuating lever. The main body partially surrounds a receiving opening of the carabiner hook. The closing lever is mounted on the main body via a closing lever pivot for pivoting movement between closed and maximum open positions. The closing lever is retainable in the closed position by the retaining part, and is pivotable from the closed position into the maximum open position by the actuating lever, which is mounted pivotably on the main body via an actuating lever pivot. The actuating lever exerts a pivoting action on the closing lever by an actuating pin guided in a slotted actuating hole. At least in the closed position, a distance between the actuating pin and the actuating lever pivot is at least three times greater than a distance between the actuating pin and the closing lever pivot.