Disappearance-style notebook
The retractable writing instrument uses a knock cam and outer cam mechanism to prevent rattling and impact, addressing noise and ink issues with a simpler design.
JP7877074B2Active Publication Date: 2026-06-22MITSUBISHI PENCIL CO LTD
Patent Information
- Application Number
- JP2022094613
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2022-06-10
- Publication Date
- 2026-06-22
- Estimated Expiration
- 2042-06-10
Smart Images
Figure 0007877074000001 
Figure 0007877074000002 
Figure 0007877074000003
Abstract
To provide an extendable / retractable writing instrument having a new extendable / retractable mechanism.SOLUTION: An extendable / retractable writing instrument 1 includes: a barrel 3; a knock cam 30; a rotor 40 biased rearward in the barrel 3; and an outer cam 20 provided on an inner surface of the barrel 3. The knock cam 30 and the outer cam 20 are configured to cooperate with the rotor 40 to rotate the rotor 40. The extendable / retractable writing instrument 1 may switch its state between a writing state in which the rotor 40 and the outer cam 20 are engaged and a non-writing state in which the engagement between the rotor 40 and the outer cam 20 is released. When the knock cam 30 is moved forward, the knock cam 30 presses the rotor 40 to cause the rotor 40 to move forward and rotate. The rotor 40 is restricted from rotating by contact with the knock cam 30 in a circumferential direction to engage with the outer cam 20 and thereby bring the extendable / retractable writing instrument 1 into the writing state.SELECTED DRAWING: Figure 9
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Citation Information
Patent Citations
Novel telescopic ball-point pen
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A knock type writing instrument
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Retractable writing utensil
JP2007083498A
Knock-type writing utensil with impact buffer
JP2009045825A
Knock-type writing instrument
JP2009255426A