Knock Writing Instrument Gravity Lock Mechanism
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Solution Overview
Problem
The existing knock type writing instruments require cumbersome operations to maintain a stable rubbing action due to the operating part's involvement in thermochromic ink operations, necessitating circumferential rotation to prevent front-back movement.
Innovation Solution
A knock type writing instrument design featuring a barrel with a writing member, an elastic member, an operating part, an engaging member, a knock lock member, and a braking part, allowing for a simple mechanism to switch between writing and non-writing states, with the knock lock member moving by gravity and locking to prevent forward movement of the operating part, and a speed reducing rotor that rotates with the writing member to facilitate stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the operating part is used for both knock operation and rubbing operation, then the device structure is simplified, but the rubbing operation becomes unstable due to front-back movement of the operating part
Solution Approach 1:
The operating part is divided into two functional components: a knock operation function and a rubbing operation function. The knock lock member is introduced as a separate component that specifically controls the rubbing operation stability by preventing front-back movement of the operating part during rubbing, while the operating part itself maintains its dual-function design for knock operation and rubbing operation.
2Reliability
If the operating part is rotated during rubbing operation to prevent front-back movement, then rubbing stability is improved, but the operation becomes troublesome
Solution Approach 1:
The knock lock member automatically engages with the locking part through gravitational force when the front end of the barrel is turned upward. This self-locking mechanism eliminates the need for manual rotation or additional operations by the user, as the system automatically prevents front-back movement of the operating part during rubbing operation.
3Reliability
If the knock lock member moves backward to lock with the locking part, then forward movement of the operating part is obstructed, but the mechanism complexity increases
Solution Approach 1:
The knock lock member acts as an intermediary component between the operating part and the barrel. It mediates the control of the operating part's position by engaging with the locking part on the barrel, preventing forward movement during rubbing operation while maintaining a relatively simple mechanical engagement structure.
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 design enables a stable and straightforward rubbing operation by preventing unintended movement of the operating part and reducing the impact during state transitions, enhancing user experience and writing performance.
Implementation Method 1
a knock lock member able to move inside the barrel in a front-back direction by gravity
Implementation Method 2
an elastic member biasing the writing member backward
Implementation Method 3
heat of friction generated when using the erasing member to rub a surface
Implementation Method 4
enabling writing by the thermochromic ink to be changed in color by heat
Data Source
AI summary
Provided is a knock type writing instrument provided with a simple mechanism allowing a stable fretting operation or the like. A knock type writing instrument 1 is provided with: a shaft cylinder 2; a refill 5 arranged inside the shaft cylinder 2; a spring 6 biasing the refill 5 backward; an operation part 20 pressed forward against a biasing force of the spring 6 in a knocking operation; and a main rotor 30, and is switchable between a writing state and a non-writing state with the knocking operation. The knock type writing instrument 1 is further provided with: a knock locking member 50 movable forward and backward inside the shaft cylinder 2 due to gravity; and a locking part 60 provided on a side of the shaft cylinder 2 and capable of being locked with the knock locking member 50. When a front end of the shaft cylinder 2 is directed upward, the knock locking member 50 moves backward to be locked with the locking part 60 to prevent forward movement of the operation part 20.