EP0213275B1 - Automatic mechanical pencil - Google Patents

Automatic mechanical pencil Download PDF

Info

Publication number
EP0213275B1
EP0213275B1 EP86106534A EP86106534A EP0213275B1 EP 0213275 B1 EP0213275 B1 EP 0213275B1 EP 86106534 A EP86106534 A EP 86106534A EP 86106534 A EP86106534 A EP 86106534A EP 0213275 B1 EP0213275 B1 EP 0213275B1
Authority
EP
European Patent Office
Prior art keywords
chuck
lead
slider
mouth piece
elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86106534A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0213275A1 (en
Inventor
Gouji Sakaoka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Micro Co Ltd
Original Assignee
Micro Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=15988323&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0213275(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Micro Co Ltd filed Critical Micro Co Ltd
Publication of EP0213275A1 publication Critical patent/EP0213275A1/en
Application granted granted Critical
Publication of EP0213275B1 publication Critical patent/EP0213275B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K21/00—Propelling pencils
    • B43K21/02—Writing-core feeding mechanisms
    • B43K21/22—Writing-cores gripping means, e.g. chucks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K21/00—Propelling pencils
    • B43K21/02—Writing-core feeding mechanisms
    • B43K21/027—Writing-core feeding mechanisms with sliding tubelike writing-core guide

Definitions

  • the invention refers to an automatic mechanical pencil.
  • DE-A 3 229 448 discloses an automatic mechanical pencil comprising a main body having a tip, a mouth piece connected to the tip of the main body, a connecting pipe provided at a rear portion of the mouth piece and inserted into an inner portion of the main body, a slider shiftably inserted in a front portion of the mouth piece and having an elastic piece, which frictionally holds a lead, further a chuck, whose chuck elements surround the periphery of the lead and are movably provided in the connecting pipe to be slightly shiftable in the radial direction, wherein balls and a chuck ring are positioned in the connecting pipe around the outer periphery of said chuck so as to wedge the chuck element upon the writing pressure and to release the wedge effect of the writing pressure, when said writing pressure disappears.
  • a spring is provided between the chuck and a pressure member, which abuts on extensions of the chuck elements in the resting position of the pencil in such a way that the chuck elements are slightly moved in radial direction so as to release the lead.
  • An extension of the slider abuts on this pressure member during writing, so that the chuck elements are biased by the spring to clamp to lead.
  • a mouth piece (2) connected to a main body (1) has a connecting pipe (3) on its rear portion, and a male screw provided on the outer periphery of the connecting pipe is screw clamped with a female screw provided on the main body, thus connecting the mouth piece to the main body.
  • the connecting may be effected with a fitting-in and other suitable means instead of the screw clamping.
  • a slider (4) is inserted shiftably in an axial direction.
  • the slider (4) is fitted with an elastic piece (6) so as to elastically hold a lead (5) by the frictional action at the rear portion, while at the front end a lead guide (7) made of the plastic material having a small frictional action is provided.
  • the plastic material polyacetal, polyamide, fluororesin and other thermoplastic materials having a low coefficient of the friction are used.
  • metallic pipe such as a stainless pipe can be used, but when it is made of the plastic material, i.e., polyacetal and polyamide whose coefficient of the friction is about 0.15 - 0.2, as shown in the drawing, the friction may be made extremely small.
  • the slider is integrally formed with the plastic material including the guide pipe.
  • the pipe may be separately made and then be combined.
  • the pipe (7) is preferably provided with a taper (8) at its front end and is slidably inserted in a bore (9) provided in the mouth piece.
  • a flange (10) is provided, and the slider can advance until the flange (10) abuts against a shoulder (11) of the mouth piece.
  • the mouth piece (2) may preferably be made of the plastic material, such as polyacetal and polyamide, having the similar effect to that of the guide pipe.
  • the chuck elements have such shapes as to devide the cylinder into nearly halves, having a lead gripping portion (18) with a suitable rough face internally; and the front and rear parts of the gripping portion are made so that they form a space having slightly larger diameter, adjacent to a slant, than outside diameter of the lead to combine two chuck elements facing each other.
  • a flange (19) is so provided that it abuts against a rear end (20) of the chuck ring (17) to prevent the chuck and balls from falling out forwardly; however, the flange (19) is not always necessary.
  • the chuck ring (17) is provided with a shoulder (21) rearwardly to form into smaller diameter (22) and is pressed in a bore (23) of the connecting pipe (3) under either state of an idle fitting or a light press fitting. Under this state, the tip of the chuck ring abuts on a slant (24) adjacent to the bore (23); and in the smaller diameter portion (22) at the rear portion, an inner projection (25) of the connecting pipe (3) comes in, and the rear end (20) of the chuck ring projects slightly backward. Since the chuck is formed as mentioned above, when it is shifted backwardly, the balls roll into the narrow portion of the tapered face and the chuck elements are tightened to grip the lead.
  • a spring (27) is provided so as to project the front end of the guide pipe (7) of the slider (4) from the tip of the mouth piece (2) and to urge the chuck (13) backwardly.
  • the slider (4) is inserted from the rear of the mouth piece; the spring (27) is inserted; the chuck elements (12), (12) are combined; balls (15) are put in and under such a state, the chuck ring (17) is fitted in, and these portions may be forcibly pushed in from the rear portion of the connecting pipe (3) over the inner projection (25). Thereafter, by the fact that the flange (10) abuts on the shoulder (11), and the balls are pushed by the tapered portion (16) of the chuck ring (17), both of the slider and the chuck would never drop out from the mouth piece.
  • the lead (5) is pushed from the rear of the chuck (13), and by the tip of the lead, the chuck (13) is advanced.
  • the gripping force by means of the balls (15) and the chuck ring (17) will vanish and the lead will pass through the gripping portion of the chuck, the front end of the lead advances until it becomes flush with the tip of the guide pipe (7) of the slider (4).
  • the chuck shifts backward, thus an action of the gripping force prevents the lead from retracting.
  • plastic foam (28) of a shape as approximately conforming to the inner wall of the main body is put on, and by the plastic foam, the shock in case of dropping of the pencil is softened, thus the breakage of the lead may be prevented.
  • the main body is formed transparent, the length of the residue lead may be seen through.
  • the writing may be effected and the writing pressure will be received by the shoulder (29) of the main body via the chuck, balls, and the chuck ring. Further, when the inner projection (25) of the connecting pipe is made strong, the writing pressure may be received by the projection.
  • the slider (4) will retract against the spring (27) with the wear of the lead.
  • the chuck will also advance to release the gripping action by the balls and the chuck ring, so that the advance of the lead is not checked. Thereafter, the chuck returns backward by the spring (27), and the gripping action by the balls and the chuck ring is restored to check the retraction of the lead.
  • the mouth piece When the lead is consumed, the mouth piece may be taken off from the main body and the new lead may be supplied from the rear portion of the chuck. Even through the removal of the mouth piece, the chuck will never be separated from the mouth piece.
  • a slant (30) is provided on the rear end of the chuck (13), and a push button (32) having a slant 31) engaging with the slant (30) is provided on the side of the main body (1) so that the button can freely go in and out.
  • the button (32) is normally put under the state that the slant would not be operated by the elastic legs (33). As shown in Fig.
  • the chuck (13) when the lead is put under the projected state, by pushing the push button (32), the chuck (13) is advanced via the slant (30), (31) and the gripping action of the chuck may be made to vanish, so that when the tip of the lead is pushed on a paper face, the tip of the lead will become flush with the guide pipe of the slider, thus the lead can be restored.
  • the mouth piece may be provided with a cap, and the supply mechanism for the lead may be provided within the main body.
  • the formation thereof is simple, comprising a small number of parts, so that it may be made economically and used conveniently with few troubles.

Landscapes

  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
EP86106534A 1985-08-10 1986-05-14 Automatic mechanical pencil Expired - Lifetime EP0213275B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP60174992A JPS6235896A (ja) 1985-08-10 1985-08-10 自動繰出式シヤ−プペンシル
JP174992/85 1985-08-10

Publications (2)

Publication Number Publication Date
EP0213275A1 EP0213275A1 (en) 1987-03-11
EP0213275B1 true EP0213275B1 (en) 1990-03-07

Family

ID=15988323

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86106534A Expired - Lifetime EP0213275B1 (en) 1985-08-10 1986-05-14 Automatic mechanical pencil

Country Status (4)

Country Link
EP (1) EP0213275B1 (enrdf_load_stackoverflow)
JP (1) JPS6235896A (enrdf_load_stackoverflow)
KR (1) KR890001645B1 (enrdf_load_stackoverflow)
DE (1) DE3669281D1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0650235Y2 (ja) * 1988-03-04 1994-12-21 三菱鉛筆株式会社 シヤープペンシル
JPH0621754Y2 (ja) * 1988-03-04 1994-06-08 三菱鉛筆株式会社 シヤープペンシル用チヤツクセツト
JPH0621755Y2 (ja) * 1988-12-12 1994-06-08 三菱鉛筆株式会社 シヤープペンシル用チヤツクセツト
JPH0286785U (enrdf_load_stackoverflow) * 1988-12-26 1990-07-10

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3424535A (en) * 1966-10-18 1969-01-28 Konstantin F Schischkow Self-feeding pencil
US3544228A (en) * 1968-10-16 1970-12-01 Ludwig Wittrock Thin-lead mechanical pencil
DE2153400A1 (de) * 1971-10-27 1973-05-03 Kemal Dipl Ing Butka Fuellstifte fuer duenne bleiminen
US3864046A (en) * 1973-02-16 1975-02-04 Kemal Butka Mechanical pencil, especially for thin leads
DE2447431C3 (de) * 1974-10-04 1979-12-13 Fa. A.W. Faber-Castell, 8504 Stein Füllminenstift mit verschiebbarer Mine
US4270870A (en) * 1977-05-22 1981-06-02 Ancos Co., Ltd. Mechanical pencil with chuck closing by normal writing grip
US4411543A (en) * 1979-10-29 1983-10-25 Pentel Kabushiki Kaisha Self-feeding mechanical pencil
DE3229498C2 (de) * 1982-08-07 1985-08-14 Fa. J.S. Staedtler, 8500 Nürnberg Schreibeinsatz mit Minen für automatische Schreib- oder Zeichenmaschinen

Also Published As

Publication number Publication date
EP0213275A1 (en) 1987-03-11
JPH0460440B2 (enrdf_load_stackoverflow) 1992-09-28
JPS6235896A (ja) 1987-02-16
KR890001645B1 (ko) 1989-05-12
DE3669281D1 (de) 1990-04-12
KR870001945A (ko) 1987-03-28

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