Writing Instrument Clip Attachment Mechanism
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Solution Overview
Problem
Existing clip attachment systems for writing instruments, particularly those made of plastic and metal, face issues with reliability due to deformation and disengagement from the body after repeated use, especially when subjected to various directional pressures.
Innovation Solution
A clip system featuring a bar with a polygonal cross-section that integrates with a locking element and attachment members, providing a cavity for secure radial insertion and immobilization, with snap-lock members and a fin structure to prevent disengagement and ensure correct orientation, thus enhancing the clip's attachment reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If snap-lock reliefs are used to attach plastic clips to the body, then the clip can be easily attached, but the reliefs deform or flatten after repeated manipulations causing disengagement
Solution Approach 1:
The attachment system is divided into separate functional components: the clip body, the projecting attachment member with groove, and the locking element. This segmentation allows each component to perform its specific function optimally while distributing mechanical stresses away from any single attachment point, preventing deformation of individual reliefs.
Solution Approach 2:
The locking element acts as an intermediary component between the clip and the body. Instead of relying solely on the clip's snap-lock reliefs directly engaging with the body, the locking element mediates the connection by fitting into the groove of the attachment member, providing a more robust transmission of forces.
2Strength
If metal clips are inserted into grooves with serrations to prevent disengagement, then attachment strength is improved, but the serrations wear down after repeated manipulations
Solution Approach 1:
The locking element is designed as a separate, replaceable component that can be easily removed and replaced. Rather than designing a permanent serrated groove that will wear down, the system uses a locking element that interfaces with the groove in a way that distributes wear across multiple contact points, extending the service life of the attachment mechanism.
Solution Approach 2:
The system changes the geometric parameters of the attachment interface by introducing a locking element with specific dimensional relationships to the groove. The locking element's dimensions are carefully proportioned to engage with the groove in a way that maximizes contact area and distributes mechanical stresses, reducing wear on individual serrations.
3Strength
If the clip is made as a solid bar element, then structural strength is improved, but the attachment mechanism becomes more complex
Solution Approach 1:
The locking element is merged with the clip assembly as an integrated component rather than a separate attachment mechanism. The locking element fits within the groove of the attachment member and works in conjunction with the clip's base structure, combining multiple functions (structural support, attachment, and locking) into a unified assembly that maintains simplicity.
Data Source
AI summary
A writing instrument that includes a body extending longitudinally along a central axis (X), a clip extending in parallel to the central axis (X), from a base fixed to the body up to a free end, and a first projecting member for attaching the clip, having a first lateral side extending between a base that is integral with the body and a radially distant apex. The clip includes a bar having a first end that is integral with the base of the clip, where the body includes a second projecting attachment member having a second lateral side facing the first lateral side, the second lateral side extending from a base that is integral with the body up to an upper end from which a projection extends towards the first lateral side, up to a free end.