Sealed Damper Space in Retractable Writing Implement Knock Mechanism
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Solution Overview
Problem
Conventional writing implements with retractable mechanisms suffer from impact-related damage and user discomfort due to elastic fatigue and strong return forces, which existing air-dampers fail to adequately address due to issues with air hole sizing affecting collision cushioning.
Innovation Solution
A sealed damper space is created between the knock section and the shaft tube, with volume changes during push-out operations to cushion impacts, using seal members to maintain air pressure and prevent external interference, allowing for controlled return and protrusion of the writing tip without obstructing normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an air-damper mechanism with air holes is used to cushion collision, then impact cushioning is provided, but air passage may be completely blocked or significantly slowed down, leading to unsatisfactory return operation
Solution Approach 1:
The patent extracts the air-damper function from a traditional air-hole structure and relocates it to a sealed space formed by the knock section, shaft tube, and seal members. This separation allows the air cushioning function to operate independently without interfering with the return operation, as the sealed space can compress and expand air without requiring continuous air passage
Solution Approach 2:
The seal members act as intermediaries that create a sealed air space between the knock section and shaft tube. This sealed air space serves as an intermediary medium that cushions impact collisions while maintaining proper air pressure for smooth return operation, resolving the contradiction between impact protection and operational smoothness
2Object-affected harmful factors
If a sealed damper space is created to cushion impacts, then impact cushioning and air pressure maintenance are improved, but device complexity increases due to additional seal members
Solution Approach 1:
The knock section is designed to serve multiple functions: it acts as both the operating component for protruding/retracting the writing tip and as one boundary of the sealed damper space. The shaft tube similarly serves as both the structural housing and the other boundary of the sealed space. This multi-functionality reduces the need for additional dedicated components for impact cushioning
Solution Approach 2:
The seal members use flexible sealing rings or O-rings that can elastically deform to seal the gap between the knock section and shaft tube. These flexible seals provide effective sealing with minimal structural complexity, creating the damper space without requiring rigid or complex sealing mechanisms
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
The sealed damper space effectively cushions impacts during both push-out and return operations, reducing the risk of damage and user discomfort by maintaining air pressure and preventing external interference, thus enhancing the reliability and usability of retractable writing implements.
Implementation Method 1
a damper space being provided between the knock section and the shaft tube and sealed off from the outside; volume of the damper space being changed by the push-out operation of the knock section
Implementation Method 2
The sealed damper space effectively cushions impacts during both push-out and return operations, reducing the risk of damage
Data Source
AI summary
A writing implement is provided including a knock mechanism, in which, without obstruction of normal operation, impact can be cushioned by a damper space that is sealed off from the outside. The writing implement (10) including the knock mechanism capable of advancing a writing tip (11) by push-out operation, includes: a holding section (12) for holding the writing tip (11); a shaft tube (20) for containing the holding section (12); a knock section (30) for covering a rear end portion of the shaft tube (20); a push-out section (13) for pressing the holding section (12) toward a front end in operative association with push-out operation of the knock section (30); and the damper space (40) provided between the knock section (30) and the shaft tube (20), being sealed off from the outside, and changing its volume by push-out operation of the knock section (30).