Claims
- 1. A lead cartridge comprising:
- a cartridge body for being detachably fitted into a mechanical pencil having a lead guide, said lead guide being provided with a rearwardly extending cylindrical portion adapted to guidingly receive a single lead, said cartridge body having an open front end and a diameter sufficient to receivably contain a plurality of leads therein; and
- closure means, fixed to said lead cartridge intermediate said cartridge body and said lead guide, for releasably sealing said cartridge body, said closure means being releasably movable between a first position and a second position, said closure means in said first position preventing extension out of said cartridge body of any of said plurality of leads contained therein, said closure means in said second position permitting any single lead of said plurality of leads contained in said cartridge body to pass out of said cartridge body into said lead guide, said closure means being resiliently biased to said first position, said closure means and said rearwardly extending cylindrical portion of said lead guide cooperating to hold said closure means in said second position when said cartridge body is fitted into said mechanical pencil, wherein said closure means comprises abutting means, defined by tapered surfaces formed at a rear end of said closure means, for abutting said rearwardly extending cylindrical portion of said lead guide, said rear end of said closure means being cylindrically shaped and disposed within said open front end of said cartridge body.
- 2. A lead cartridge comprising:
- (a) a cartridge body for storing a plurality of leads, said cartridge body being detachably receivable in a mechanical pencil having a lead guide, said lead guide being provided with an inner rear cylindrical portion through which said leads are fed one at a time and a front cylindrical portion having a receiving hole for receiving a rear end of a lead chuck; and
- (b) an openable capping structure formed of an elastic material and having a front and rear end, said openable capping structure being in a substantially cylindrical form and fixedly joined at said rear end into an open front portion of said cartridge body, said openable capping structure having a lead guide receiving hole, formed at said front end of the capping structure, and a lead passage formed at a center of a tapered structure on a bottom wall of said lead guide receiving hole at said rear end of said capping structure, said inner rear cylindrical portion of said lead guide being closely received in said lead guide receiving hole for releasably moving said capping structure between a first position and a second position when said cartridge body is received in said mechanical pencil, said lead passage having a variable diameter allowing the individual passage of leads, when in said first portion, said inner rear cylinder portion of said lead guide is closely received in said lead guide receiving hole of said capping structure and abutting said tapered surface thereof, and, when in said second position, said capping structure preventing the individual passage of leads when said inner rear cylindrical portion of said lead guide is not closely received in said lead guide receiving hole, said openable capping structure further comprising a flange provided at the front end of the capping structure.
- 3. A lead cartridge comprising:
- (a) a cartridge body means for storing a plurality of leads and for being detachably push-fit into a mechanical pencil having a lead guide, said lead guide being receivable of said leads and being provided with a rearwardly extending cylindrical portion through which said leads are fed one at a time, said cartridge body means having an open front end; and
- (b) capping means for closing said open front end of said cartridge body means until such time as said cartridge body means is push-fit into said mechanical pencil, said capping means comprising lead passage means for passing leads from said cartridge body means to said lead guide, said lead passage means being movable between a first position and a second position, said lead passage means when in said first position being closed sufficiently so that lead is securely retained in said cartridge body means, said lead passage means when in said second position being open so that lead can pass therethrough, said rearwardly extending cylindrical portion of said lead guide releasably moving said lead passage means between said first position and said second position when said cartridge body means is push-fit into said mechanical pencil, said lead passage means being resiliently biased to said first position,
- wherein said capping means comprises abutting means, defined by tapered surfaces formed at a rear end of said capping means, for abutting said rearwardly extending cylindrical portion of said lead guide, said rear end of said capping means being cylindrically shaped and disposed within said open front end of said cartridge body means, and wherein said capping means comprises a flange provided at an extreme front end of said capping means, said rearwardly extending cylindrical portion of said lead guide and abutting means cooperating to open said lead passage means sufficiently for lead to pass therethrough only when said cartridge body means is fully push-fit into said mechanical pencil.
- 4. A lead cartridge as recited in claim 3, wherein said capping means is formed as a single unit.
- 5. A lead cartridge as recited in claim 4, wherein said single unit is of an elastic material.
- 6. A lead cartridge as recited in claim 5, wherein said elastic material is elastomeric.
- 7. A lead cartridge as recited in claim 3, wherein said capping means is a forwardly-opening essentially cup-shaped member which includes a base member.
- 8. A lead cartridge as recited in claim 7, wherein said abutting means comprises an inside surface of said base member of said cup-shaped member.
- 9. A lead cartridge as recited in claim 8, wherein said abutting means is pressed rearwardly and outwardly by said rearwardly extending portion of said lead guide when said cartridge body means is fully push-fit into said mechanical pencil, to thereby cause said lead passage means to open sufficiently for lead to pass therethrough.
- 10. A lead cartridge as recited in claim 3, wherein said abutting means is pressed rearwardly and outwardly by said rearwardly extending portion of said lead guide when said cartridge body means is fully push-fit into said mechanical pencil, to thereby cause said lead passage means to open sufficiently for lead to pass therethrough.
Priority Claims (1)
Number |
Date |
Country |
Kind |
62-75697 |
May 1985 |
JPX |
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Parent Case Info
This application is a continuation-in-part, continuation division of application Ser. No. 219,894 filed July 14, 1988, now abandoned, which is in turn a continuation of application Ser. No. 865,782, filed May 22, 1986, now abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (1)
Number |
Date |
Country |
3401647 |
Jan 1986 |
DEX |
Continuations (2)
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Number |
Date |
Country |
Parent |
219894 |
Jul 1988 |
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Parent |
865782 |
May 1986 |
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