Dial Projection Pieces Radial Positioning and Slippage Prevention
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Solution Overview
Problem
Existing wristwatch and timepiece dial attachment methods are inefficient, as they often rely on pins and holes which can lead to slippage and damage during assembly and disassembly, and lack effective radial positioning mechanisms.
Innovation Solution
A dial design featuring projection pieces that project radially from the dial's outer circumference, which engage with the wristwatch case's inner circumferential surface to securely position the dial and prevent slippage, combined with a disassembly jig that uses guide pins and hold-down areas to facilitate easy detachment and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pins and holes are used for dial attachment, then the dial can be fixed to the module body, but slippage and damage occur during assembly and disassembly
Solution Approach 1:
The dial is divided into multiple sections with projection pieces at different locations (outer circumferential portion, inner circumferential portion, and intermediate portion). Each projection piece engages with corresponding recesses in the module body, distributing the attachment forces and preventing slippage while maintaining secure fixation.
Solution Approach 2:
Projection pieces act as intermediary elements between the dial and module body. These projections engage with recesses to transmit forces during assembly and disassembly, eliminating direct pin-hole interactions that cause slippage and damage.
2Reliability
If a secure attachment mechanism is used, then the dial is firmly fixed, but the assembly and disassembly process becomes complex
Solution Approach 1:
The attachment mechanism is segmented into multiple projection pieces distributed around the dial's circumference. Each projection engages independently with corresponding recesses, providing secure fixation through distributed engagement rather than a single complex locking mechanism.
Solution Approach 2:
The projection pieces and recesses form a self-aligning attachment system. During assembly, the projections automatically engage with the recesses without requiring precise manual alignment or complex tools, simplifying the assembly process while maintaining secure fixation.
3Manufacturing precision
If radial positioning mechanisms are added, then positioning accuracy is improved, but the dial structure becomes more complex
Solution Approach 1:
Radial positioning is achieved through multiple projection pieces located at different radial positions on the dial. Each projection engages with corresponding recesses to establish precise radial relationships between the dial and module body without requiring a single complex positioning mechanism.
Solution Approach 2:
The attachment and radial positioning functions are merged into a single integrated system. The projection pieces simultaneously provide both attachment security and radial positioning accuracy, eliminating the need for separate positioning mechanisms and reducing overall structural complexity.
Data Source
AI summary
A dial including a projection piece projecting in a radial direction and a pin projecting from the projection piece. In addition, an electronic device including a case having a switch provided on an outer circumferential surface, and a dial arranged in the case, in which the dial includes a projection piece that projects from an outer circumferential surface opposing the switch and comes in contact with an inner circumferential surface of the case.