IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0883651
(2004-07-06)
|
우선권정보 |
JP-0271595 (2003-07-07); JP-0053200 (2004-02-27) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
4 |
초록
▼
A writing instrument has a cap including an inner cylinder portion having an open end and a close end, a cylindrical outer cylinder portion having open ends, a plurality of connection rib integrally connected to an outer surface of the inner cylinder portion and extending in an axial direction and a
A writing instrument has a cap including an inner cylinder portion having an open end and a close end, a cylindrical outer cylinder portion having open ends, a plurality of connection rib integrally connected to an outer surface of the inner cylinder portion and extending in an axial direction and a plurality of vent hole respectively formed between adjacent ones of the connection ribs and a writing instrument body including a pen tip. The open end of the inner cylinder portion extends rearwardly of the connection ribs, the inner cylinder portion seals the pen tip when the cap is fitted on a pen tip side of the writing instrument body and an annular seal portion which is closely contact with an annular airtight portion on the pen tip side of the writing instrument body is provided on the outer peripheral surface of the open end portion of the inner cylinder portion.
대표청구항
▼
1. A writing instrument comprising:a cap including:an inner cylinder portion having an open end and a close end;a outer cylinder portion having open ends;a plurality of connection rib that extends in an axial direction of the cap, the connection ribs integrally connecting an outer surface of the inn
1. A writing instrument comprising:a cap including:an inner cylinder portion having an open end and a close end;a outer cylinder portion having open ends;a plurality of connection rib that extends in an axial direction of the cap, the connection ribs integrally connecting an outer surface of the inner cylinder portion and the outer cylinder portion; anda plurality of vent hole respectively formed between adjacent ones of the connection ribs; anda writing instrument body including a pen tip,wherein the open end of the inner cylinder portion rearwardly extends beyond the connection ribs,the inner cylinder portion seals the pen tip when the cap is fitted on a pen tip side of the writing instrument body andan annular seal portion which closely contacts with an annular airtight portion on the pen tip side of the writing instrument body is provided on the outer peripheral surface of the open end of the inner cylinder portion.2. The writing instrument as set forth in claim 1, wherein the writing instrument body further comprises:an ink reservoir member having the pen tip at a front end thereof;a barrel in which the ink reservoir member is accommodated in a front portion thereof;an ink tank formed rearwardly of the ink reservoir member inside the barrel, wherein the ink reservoir member is adapted to temporarily store excess ink corresponding to a rise in the internal pressure within the ink tank,the annular airtight portion is provided on an inner peripheral surface of an opening portion of a front end of the barrel,an outwardly oriented protrusion is provided on an outer peripheral surface of the barrel rearwardly of the annular airtight portion, andan inwardly oriented protrusion for riding over and being engaged with the outwardly oriented protrusion is provided on an inner peripheral surface of the outer cylinder portion rearwardly of the annular seal portion of the cap.3. The writing instrument as set forth in claim 2, wherein a rear surface of the outwardly oriented protrusion is an inclined surface in such a manner that the outside diameter of the outwardly oriented protrusion becomes smaller toward the rear of the cap.4. The writing instrument as set forth in claim 2, wherein a plurality of shaking-preventing spot-like projection dispersed in a circumferential direction are integrally formed on the outer peripheral surface of the barrel rearwardly of the outwardly oriented protrusion.5. The writing instrument as set forth in claim 2, wherein a detent protrusion is integrally formed on the inner peripheral surface of the barrel rearwardly of the annular airtight portion,the detent protrusion rides over and is engaged with the ink reservoir member.6. The writing instrument as set forth in claim 5, wherein the detent protrusion is formed rearwardly of the outwardly oriented protrusion.7. The writing instrument as set forth in claim 5, wherein the detent protrusion is formed forwardly of the outwardly oriented protrusion.8. The writing instrument as set forth in claim 1, wherein the outside diameter of the annular seal portion is smaller than the outside diameter of the inner cylinder portion between the connection ribs.9. The writing instrument as set forth in claim 1, wherein the cap is made of a synthetic-resin.10. The writing instrument as set forth in claim 9, wherein the synthetic-resin is selected from at least one of polypropylene resin, polyethylene resin, polyester resin, polycarbonate resin or ABS resin.11. The writing instrument as set forth in claim 1, wherein the cap is formed by an injection molding method.12. The writing instrument as set forth in claim 1, wherein the cap further includes:a clip integrally formed on the outer surface of the outer cylinder portion, the clip extending to an axial direction,wherein a circumferential thickness of the connection rib located in the vicinity of an attached proximal portion of the clip is larger than the thickness of the other connection ribs.13. The writing instrument as set forth in claim 1, wherein a plurality of axially extending longitudinal ribs is integrally formed on the outer peripheral surface of the inner cylinder portion.14. The writing instrument as set forth in claim 13, wherein the rear ends of the axially extending longitudinal ribs connect to the front ends of the outer cylinder.15. The writing instrument as set forth in claim 14, wherein a plurality of vent groove are formed between the respective axially extending longitudinal ribs, and the rear ends of the vent grooves connect to a front end of the vent hole of the connection ribs.16. The writing instrument as set forth in claim 1, wherein the annular airtight portion is an annular smooth surface.17. The writing instrument as set forth in claim 1, wherein the annular airtight portion is an annular protrusion.18. The writing instrument as set forth in claim 1, wherein an axial close-contact sliding length defined between the annular seal portion and the annular airtight portion is in a range of 0.1 mm to 1.0 mm.19. The writing instrument as set forth in claim 18, wherein the axial close-contact sliding length is in a range of 0.1 mm to 0.5 mm.20. The writing instrument as set forth in claim 1, wherein the pen tip is made of a fiber-bundle resin processed part.21. The writing instrument as set forth in claim 1, wherein the annular seal portion is constituted by an annular smooth surface.22. The writing instrument as set forth in claim 1, wherein the annular seal portion is formed by an annular protrusion.23. The writing instrument as set forth in claim 1, wherein an outer-cylinder-portion connecting side of a rear end portion of the connection rib is extended and provided rearwardly of an inner-cylinder-portion connecting side of the connection rib.24. The writing instrument as set forth in claim 23, wherein the outer-cylinder-portion connecting side of the rear end portion of the connection rib serves as an abutment wall portion for abutment against the pen tip side of the writing instrument body when the cap is fitted.
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