Rotatable Sealing Cap Anti-Drying Mechanism for Writing Tools
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Solution Overview
Problem
Existing retractable press type fluorescent and marker pens face issues with ink drying due to friction and wear in the anti-dry structures, leading to poor sealing and premature failure of the rotatable parts, which obstructs smooth operation and ink preservation.
Innovation Solution
A writing tool with a rotatable sealing cap and sealing pad that reduces friction and wear by forming a close contact, along with a switch sleeve and elastic parts that prevent deformation, allowing for smooth opening and closing of the pen tip, and an ink cartridge that moves with a pressing rod to maintain a locked state, preventing air circulation and ink drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotatable part closely attaches to the inner wall of the bottom end of the penholder to open and close the opening, then the sealing effect is improved, but the friction force increases causing the rotatable part to wear out or break down
Solution Approach 1:
The patent introduces a lifting cap as an intermediary component between the rotatable sealing cap and the penholder bottom wall. The lifting cap includes lifting protrusions that engage with rotating grooves, mediating the rotational motion and reducing direct friction between the sealing cap and the penholder wall, thereby maintaining sealing effectiveness while enabling smooth rotation
Solution Approach 2:
The patent divides the sealing mechanism into multiple independent components: the rotatable sealing cap, the lifting cap with lifting protrusions, and the rotating grooves. This segmentation allows each component to perform its specific function independently, with the lifting cap handling the rotational motion transmission while the sealing cap maintains the seal, reducing wear on any single part
2Reliability
If the rubber ring contacts the pen-tip tube body to block air flow, then the anti-drying function is improved, but the retractable ink cartridge and rubber ring rub against each other obstructing the pen tip
Solution Approach 1:
The patent replaces the direct contact between the rubber ring and pen-tip tube body with an intermediary mechanism. The rotatable sealing cap with closing surface acts as the mediator that seals the access hole, while the lifting cap with lifting protrusions mediates the motion control, preventing direct friction between the sealing elements and the ink cartridge, thus maintaining anti-drying function while ensuring smooth pen tip retraction
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 solution ensures a gentle and smooth operation of the pen tip, reduces wear and friction, and effectively prevents ink from drying out by maintaining a sealed environment, enhancing the longevity of the pen tip and ink cartridge.
Implementation Method 1
an upper portion of the switch sleeve is respectively provided with an elastic part on both sides
Implementation Method 2
the supporting spring is arranged between the sealing pad and the spring mounting surface
Data Source
AI summary
Provided is a writing tool with an anti-drying device, comprising a pen holder (110), a pen tip (1) arranged in the pen holder (110), an ink cartridge (130) and a pressing rod (150). The writing tool with the anti-drying device further comprises an anti-drying device (200), wherein the anti-drying device (200) comprises a switch sleeve (210), a lifting cap (220), a tapping spring (214), a rotatable sealing cap (230), a sealing pad (240) and a support spring (244). The switch sleeve (210) is inserted in the pen holder (110), an elastic part (211) is respectively arranged on each of the two sides of the upper end of the switch sleeve (210), the switch sleeve (210) is further provided with a lifting groove (212) extending to be distributed on the elastic part (211), a rotating groove (213) is arranged on the side of the lower end of the switch sleeve (210); the lifting cap (220) is inserted in the switch cover (210), a support protrusion (221) is respectively arranged on each of the two sides of the upper end of the lifting cap (220), and the rotatable sealing cap (230) is used for turning so as to open or close an access hole (241).