Retractable Talon Finger Assembly for Robotic Grasping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Robotic manipulators face challenges in securely grasping and lifting objects due to limited gripping force and stability, especially when dealing with varied object orientations and sizes, which affects their efficiency and reliability in industrial applications.
Innovation Solution
The design incorporates retractable talons with high-friction surfaces and compliance mechanisms in finger assemblies, allowing for adjustable gripping and load support, enabling the robotic arm to apply horizontal forces effectively and accommodate different object orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a robotic arm uses a simple finger structure with basic friction surfaces, then the device complexity is low, but the gripping force and stability are insufficient for securely grasping and lifting objects
Solution Approach 1:
The finger assembly is divided into multiple functional segments: a finger body for basic gripping, a retractable talon for enhanced under-object support, and a compliance mechanism for adaptive force application. This segmentation allows each component to contribute specifically to gripping force while maintaining manageable overall complexity
Solution Approach 2:
The talon is designed to be retractable rather than fixed, allowing it to dynamically extend beneath objects during lifting operations and retract when not needed. This dynamic configuration enables the system to adapt its gripping mechanism based on operational requirements, enhancing gripping force only when necessary
2Adaptability or versatility
If the robotic arm uses fixed gripping force, then the control system is simple, but it cannot accommodate varied object orientations and sizes effectively
Solution Approach 1:
The compliance mechanism enables the finger assembly to dynamically adjust its gripping characteristics. By allowing controlled deformation and movement within the finger structure, the system can adapt to different object geometries, orientations, and sizes without requiring complex active control systems
Solution Approach 2:
The compliance mechanism changes the physical parameters of the finger assembly, specifically its stiffness and contact point position. This allows the same basic structure to effectively grasp objects of varying sizes and orientations by passively adapting its configuration rather than requiring active reconfiguration
3Reliability
If the robotic arm applies high horizontal normal force to squeeze objects, then the gripping force is strong, but it may damage fragile objects or fail to provide stable support for lifting
Solution Approach 1:
The gripping function is segmented into two distinct mechanisms: the finger body applies controlled horizontal friction force for secure grasping, while the retractable talon provides vertical support for lifting. This segmentation allows the system to distribute the mechanical load appropriately, preventing excessive force from being applied at any single contact point
Solution Approach 2:
The talon acts as an intermediary element between the finger body and the object. It extends to contact the underside of objects, providing a mechanical bridge that transfers lifting forces directly to the object's center of gravity, thereby stabilizing the grasp and preventing damage to the object's surface
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 solution enhances the robotic arm's ability to securely grasp and lift objects by providing adjustable gripping force and stability, improving its efficiency and reliability across various industrial tasks.
Implementation Method 1
a spring disposed within the finger body and biased to extend the talon outwardly from the contact face of the finger body
Implementation Method 2
The talon may include a high-friction surface that contacts a surface of the object
Data Source
AI summary
Finger assemblies at the end of a robotic arm end effector includes talon that are retractable. Retraction may be accomplished by a vertical or horizontal barrel cam, a paddle and spin assembly, and/or a resilient plate.