Crystal Support Catch Asymmetry for Stable Pulling
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Solution Overview
Problem
Existing crystal supports for crystal pulling systems face challenges in stability and compactness due to the oblique pressure and bending stress on the catches, which can lead to slipping and jaw retreatment, compromising the crystal's stability and diameter.
Innovation Solution
The crystal support design features catches with a parting plane that extends at an angle to at least one pivot axis, allowing the contact points to be on both sides of a crystal plane, enabling steep orientation of the catches without generating torque, thus reducing space requirements and allowing a lightweight structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the catches are arranged obliquely to support the crystal, then the crystal can be carried by the thickened neck portion, but radial forces are exerted on the carrier requiring it to be embodied in a stable manner, increasing device complexity
Solution Approach 1:
The patent applies asymmetry by orienting the parting plane at an angle to the pivot axis rather than parallel to it. This asymmetric arrangement causes the contact points to be positioned on both sides of the crystal plane, which changes the force distribution on the catches. The oblique orientation of the parting plane relative to the pivot axis creates a geometric configuration that reduces radial force components while maintaining support reliability.
2Device complexity
If the catches are arranged steeply to reduce carrier stability requirements, then the carrier can be simpler, but the catches risk slipping on the thickened neck portion
Solution Approach 1:
The asymmetric orientation of the parting plane at an angle to the pivot axis optimizes the contact geometry between the catches and the thickened neck portion. This angular relationship ensures that the contact points are positioned to maximize friction and prevent slipping, while still allowing for a simpler carrier design. The specific angular arrangement creates optimal force distribution that enhances gripping reliability without requiring an overly complex carrier structure.
3Stability of the object's composition
If the catches are arranged symmetrically with respect to the crystal axis, then the force distribution is balanced, but the structure requires more space and cannot be constructed in a compact manner
Solution Approach 1:
The patent deliberately employs asymmetric geometry by setting the parting plane at an angle to the pivot axis rather than maintaining symmetry. This asymmetric configuration allows the contact points to be positioned on both sides of the crystal plane, achieving balanced force distribution through geometric optimization rather than symmetric arrangement. The result is a compact crystal support structure that maintains force balance through angular relationships rather than symmetric positioning.
4Weight of moving object
If the catches are made lightweight to reduce overall support weight, then the structure is more compact, but the catches may not withstand the bending stress and axial forces
Solution Approach 1:
The asymmetric orientation of the parting plane relative to the pivot axis fundamentally changes the stress distribution on the catches. By positioning the contact points on both sides of the crystal plane through angular arrangement, the design transforms the loading conditions such that the catches experience primarily compressive forces rather than bending moments. This allows the catches to be constructed with less material while maintaining adequate strength, resulting in a lightweight yet durable crystal support structure.
Data Source
AI summary
A crystal support for a crystal pulling system includes two catches that have a respective retaining jaw that is placeable against a thickened neck portion of a crystal. The two catches are moveable into a bearing position in which the two catches bear on the thickened neck portion and into a releasing position in which the two catches are away from the thickened neck portion. In the bearing position, respective contact points of each retaining jaw at which the retaining jaws bear on the thickened neck portion are located on respective sides of a parting plane. The parting plane extends at an angle to at least one of the pivot axes of the catches and, in the bearing position, the respective contact points of each retaining jaw are located on both sides of a crystal plane that extends through an axis of the crystal and parallel to the pivot axes.