Endoscope Deflection Frame Rivet Welding Clearance
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Solution Overview
Problem
Conventional endoscope shaft deflection systems with rivets having two heads are less torque resistant due to clearance issues between the rivet body and deflection rings, and the welding process in Storz construction can deform rings, making it difficult to maintain guaranteed clearance.
Innovation Solution
A method involving a mandrel to align and position rivets within the endoscope deflection section frame, where each rivet has one head located internally and is welded to the outer ear of the ring, ensuring proper clearance and stability by avoiding deformation during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rivet with two heads is used in conventional construction, then the rivet can be inserted from inside the deflection system and formed with a second head from outside, but the torque resistance is reduced due to clearance between the rivet body and the two deflection ring holes
Solution Approach 1:
The invention extracts the rivet formation process from the deflection ring holes, moving the second head formation to occur outside the deflection system frame. This separates the rivet insertion (from inside) from the head formation (outside), eliminating the clearance problem that occurs when both heads are formed within the ring holes, thereby improving torque resistance while maintaining ease of manufacture.
Solution Approach 2:
The invention introduces an intermediary structure (the deflection system frame with outer ears) to receive and support the rivet during assembly. The rivet is inserted from inside, supported by the frame, and the second head is formed outside the frame where it can be properly secured without interfering with the ring holes, thus resolving the clearance issue while maintaining manufacturing ease.
2Ease of manufacture
If the rivet cylindrical body dimensions are not controlled, then assembly is easier, but guaranteed clearance between the rivet head and the two deflection rings cannot be maintained due to force applied to form the second rivet head
Solution Approach 1:
The invention performs preliminary action by inserting the rivet from inside the deflection system and positioning it within the frame structure before forming the second head outside the frame. This preliminary positioning ensures that the rivet is correctly aligned and supported, allowing the second head to be formed without applying excessive force that would compromise clearance control, thus achieving both ease of assembly and manufacturing precision.
3Strength
If the rivet is welded to the inner ear flat surface of one of the deflection rings, then the rivet can be securely attached, but the welding process requires pressing the rivet to the ring ear flat surface by force which can deform the ring and result in clearance problems
Solution Approach 1:
The invention uses the deflection system frame as an intermediary structure between the rivet and the deflection rings. The rivet is inserted from inside and supported by the frame, allowing the second head to be formed and welded to the outer ear without directly pressing against the inner ear flat surface. This intermediary support eliminates the need for forceful pressing during welding, preventing ring deformation and maintaining guaranteed clearance while ensuring secure rivet attachment.
4Strength
If force is applied to form the second rivet head from outside, then the rivet can be securely formed, but the clearance between the rivet head and the deflection rings cannot be guaranteed
Solution Approach 1:
The deflection system frame serves as an intermediary that provides support and positioning for the rivet during the second head formation process. By supporting the rivet from the frame structure, the system allows the second head to be formed with appropriate force while maintaining the rivet's correct position relative to the deflection rings, thus ensuring both secure rivet head formation and guaranteed clearance.
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 approach provides a more torque-stable endoscope shaft frame with guaranteed clearance between the rivets and rings, enhancing the structural integrity and ease of assembly by preventing deformation during the welding process.
Implementation Method 1
The opposite end is welded to the outer ear
Data Source
AI summary
An endoscope deflection section frame including a plurality of rings and rivets. Each ring has front ears and rear ears with rivet holes through the ears. The rivets are located in the rivet holes to thereby pivotably connect the rings to one another. Each rivet includes a head at an interior side of an inner one of the ears and an opposite end at an exterior side of an outer one of the ears. The opposite end is welded to the outer ear.