Mechanically controlled robotic gripper with bistability for fast and adaptive grasping

Area of Science:

• Robotics
• Bio-inspired Engineering
• Materials Science

Background:

• Traditional robotic grippers often require continuous power for grasping.
• Adaptive and energy-efficient grasping mechanisms are crucial for autonomous systems.
• Bio-inspiration offers novel solutions for complex mechanical challenges.

Purpose of the Study:

• To present a novel bistable gripper inspired by hummingbird jaw closure.
• To investigate the mechanism enabling rapid, force-free grasping.
• To evaluate the gripper's adaptability and efficiency in various scenarios.

Main Methods:

• Geometric analysis for modeling and optimizing thin elastic sheet shapes.
• Finite element simulations and experimental validation of jaw morphing.
• Analysis of snap-through and snap-back motion phases (delay and snap).
• Force, response time, and grasping experiments with varied objects.

Main Results:

• The bistable gripper achieves rapid bending within milliseconds under low pull force.
• Demonstrated adaptability for grasping diverse shapes and weights.
• Successful grasping and automatic release mechanisms were confirmed.
• The gripper operates efficiently without continuous external force application.

Conclusions:

• The novel thin sheet bending mechanism enables fast, versatile, and adaptive grasping.
• The bistable gripper shows potential for reduced energy consumption and simplified control.
• This bio-inspired design is suitable for unstructured environments like space and underwater.
• Further exploitation of this bending mechanism can advance robotic manipulation.