Gravity-Actuated Sphere Gripper for Thin Parts
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Solution Overview
Problem
Existing gripping mechanisms, such as electric and air suction systems, are costly and prone to failure, and lack the ability to securely grip thin components without power assistance.
Innovation Solution
A gripping mechanism comprising two or more spheres housed in a frame, where the spheres are made of a metal core with an elastic polyacetal resin coating, allowing for secure gripping of objects by gravity without the need for power, and a drive mechanism that moves the gripping mechanism in the XY and Z planes to facilitate assembly tasks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric or air suction gripping mechanisms are used, then gripping capability is improved, but cost and complexity increase
Solution Approach 1:
The patent replaces complex electric or pneumatic gripping systems with a simple gravity-based mechanical system. Two spheres housed in a frame grip objects purely through gravitational force, eliminating motors, sensors, and control systems while maintaining reliable gripping capability for various objects including thin components
Solution Approach 2:
The invention uses inexpensive spherical elements instead of costly electric or pneumatic components. The spheres are simple mechanical parts that can be easily replaced if needed, significantly reducing the overall cost of the gripping mechanism while maintaining functional reliability
2Force
If power-assisted gripping systems are used, then gripping force is improved, but reliability decreases due to power dependency
Solution Approach 1:
The gripping mechanism is self-activating through gravity. The spheres naturally press against objects when the frame is positioned, requiring no external power source or control system. This passive mechanical approach eliminates failure points associated with power supply, motors, and sensors, significantly improving reliability
Solution Approach 2:
The patent uses the gravitational force acting on the spheres as the gripping force. By positioning the spheres such that gravity causes them to press against the object, the system converts weight into a reliable gripping mechanism that operates consistently without power assistance
3Force
If conventional gripping mechanisms are used, then gripping strength is improved, but ability to handle thin components without damage worsens
Solution Approach 1:
The patent uses spherical contact surfaces that naturally distribute gripping force over a larger area compared to conventional grippers. This localized geometric property of spheres reduces pressure concentration on thin components, preventing damage while maintaining adequate gripping strength through the distributed gravitational force
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 solution provides an inexpensive, reliable, and secure gripping mechanism capable of handling thin components without power, maintaining grip during assembly processes and reducing the likelihood of mechanical failure.
Implementation Method 1
The spheres are made of a metal core with an elastic polyacetal resin coating
Implementation Method 2
allowing for secure gripping of objects by gravity without the need for power
Data Source
AI summary
A gripping mechanism includes a frame and two or more spheres. The frame houses the two or more spheres. At least two spheres of the two or more spheres grip an object. Preferably, the frame includes two or more side plates. The number of the two or more side plates is the same as the number of the two or more spheres. Each of the two or more side plates is inclined toward a center axis of the frame. Each of the two or more spheres is in contact with at least one side plate of the two or more side plates.