Replaceable Spectacles Arm Structure with Tool-Free Joint
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Solution Overview
Problem
The existing spectacles arm replacement process is inconvenient, requiring professional tools and leading to loose screw connections between the frame and arms due to repeated replacements.
Innovation Solution
A replaceable arm structure featuring a joint unit with a horizontal spindle and radial locating shaft, allowing for easy assembly and replacement without tools, using a joint unit with pivot seats, axial holes, and radial locating slots to maintain a stable connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are used to pivotally connect the frame and arms, then the connection is stable, but the replacement process requires professional tools and is inconvenient
Solution Approach 1:
The connection mechanism is segmented into a frame portion with a slot and an arm portion with a protrusion. The protrusion fits into the slot to form a pivotable connection, eliminating the need for screws. This segmentation allows the arm to be easily detached and reattached without requiring professional tools, while maintaining a stable pivotal connection through the geometric fit of the slot and protrusion.
Solution Approach 2:
The screw connection is extracted and replaced with a direct fit mechanism. The arm portion is designed with a protrusion that directly engages with the slot in the frame portion, removing the intermediate screw element. This extraction simplifies the replacement process to a tool-free operation while maintaining connection stability through the precise geometric配合 of the slot and protrusion.
2Reliability
If screws are used for arm attachment, then the connection is secure, but repeated replacement causes screws to loosen from screw holes
Solution Approach 1:
The connection is segmented into a frame portion with a slot and an arm portion with a protrusion. The protrusion fits into the slot to form a pivotable connection, eliminating the need for screws. This segmentation allows the arm to be easily detached and reattached without requiring professional tools, while maintaining a stable pivotal connection through the geometric fit of the slot and protrusion.
Solution Approach 2:
The slot and protrusion design provides inherent positioning and retention features that prevent loosening. The geometric配合 of the slot width and protrusion dimensions ensures that the arm remains securely attached during normal use, while still allowing for easy removal when needed. This design anticipates and prevents the loosening issue that occurs with repeated screw attachment and detachment.
3Ease of operation
If a simple pivot connection is used, then the assembly is easy, but the connection stability deteriorates
Solution Approach 1:
The connection is segmented into a frame portion with a slot and an arm portion with a protrusion. The protrusion fits into the slot to form a pivotable connection, eliminating the need for screws. This segmentation allows the arm to be easily detached and reattached without requiring professional tools, while maintaining a stable pivotal connection through the geometric fit of the slot and protrusion.
Solution Approach 2:
The slot and protrusion are designed with asymmetric dimensions where the slot width is slightly larger than the protrusion diameter, allowing for easy insertion and pivotable movement. The asymmetric geometry provides inherent positioning that maintains connection stability while enabling simple assembly and disassembly operations.
Data Source
AI summary
A replaceable arm structure for spectacles comprises a joint unit disposed between a frame and an arm. A front end of the joint unit is pivotally connected to the frame, and a rear end of the joint unit forms a horizontal spindle perpendicularly connected to a radial locating shaft. A horizontal axial hole and an axial cutout slot communicating with a radial locating slot perpendicularly are formed on a front end of the arm. The rear end of the joint unit is pivotally connected to the arm by fitting the horizontal spindle with the horizontal axial hole. The rear end of the joint unit and the arm are fixed together by fitting the radial locating shaft with the radial locating slot.