Rope Grab Mechanism for Single-Operator Portable Lifting
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Solution Overview
Problem
Existing portable winch systems require a second person for operation, are limited by rope length and weight, and lack flexibility in rope type compatibility, posing risks and inefficiencies in applications like mountain climbing and rescue operations.
Innovation Solution
A rope grab device with a securing mechanism that creates friction between the rope and a circular grab using a lever and roller system, allowing single-person operation and compatibility with various rope types, connected to a motor for lifting loads via a drive shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional winch or hoist is used, then the lifting function is achieved, but the system requires at least a second person to operate or control the device
Solution Approach 1:
The rope grab device enables the user to operate the system themselves without requiring a second person. The self-locking mechanism automatically engages when the rope is fed through, allowing the user to control both the lifting and securing functions simultaneously.
Solution Approach 2:
The rope grab device serves multiple functions: it acts as both a securing mechanism and a driving element for the winch. The same rope that secures the load also drives the drum rotation, eliminating the need for separate control systems and reducing overall device complexity.
2Length of moving object
If a traditional winch with spool is used, then lifting is achieved, but the rope length and weight are limited
Solution Approach 1:
The invention replaces the traditional spool-based mechanical system with a rope grab device that uses friction-based engagement. Instead of winding rope onto a spool, the system uses a gripping mechanism that can hold and advance the rope without physical containment, allowing for longer and lighter rope configurations.
3Adaptability or versatility
If a traditional hoist with compound pulleys is used, then lifting capability is achieved, but the device size and flexibility are reduced
Solution Approach 1:
The rope grab device is divided into functional segments including the gripping mechanism, drive interface, and anchoring system. This segmentation allows each component to be optimized for specific rope types and applications, enhancing adaptability while keeping the overall device compact.
Solution Approach 2:
The rope grab device incorporates dynamic elements that allow it to adapt to different rope types and loading conditions. The gripping mechanism can adjust its engagement characteristics based on the rope material and diameter, providing versatility without requiring multiple fixed-size components.
4Force
If friction is increased between rope and grab to improve lifting, then the rope may be damaged or worn
Solution Approach 1:
The system controls the friction parameter by adjusting the grip pressure and contact surface characteristics of the rope grab. By optimizing these parameters, sufficient friction force is generated for effective lifting while preventing excessive stress that could damage the rope structure.
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
Enables single-person operation, increased rope compatibility, and safer, more efficient lifting with reduced complexity and cost by using a high-speed motor and self-locking worm drive, minimizing risks and enhancing user control.
Implementation Method 1
the lever portion is adapted to, by means of the first roller, exert a pressure to the rope for forcing the rope towards the rope grab at a portion of the section where the rope, during operation, is engaging the rope grab
Data Source
AI summary
A rope grab device for a portable power driven system adapted for advancing a rope includes an essentially circular rope grab, wherein the rope grab is adapted to, during operation, engage the rope along at least a section of a circumference of the rope grab. The rope grab device also includes a securing device comprising a lever portion, a first roller arranged at one end of the lever portion and an anchoring point arranged at the opposite end of the lever portion adapted for receiving an anchoring force. The lever portion is attached with a hinged connection and is adapted to, by means of the first roller, exert a pressure to the rope for forcing the rope towards the rope grab at a portion of the section where the rope, during operation, is engaging the rope grab upon applying the anchoring force on the anchoring point.