EP0321581B1 - Writing utensil - Google Patents

Writing utensil Download PDF

Info

Publication number
EP0321581B1
EP0321581B1 EP88906023A EP88906023A EP0321581B1 EP 0321581 B1 EP0321581 B1 EP 0321581B1 EP 88906023 A EP88906023 A EP 88906023A EP 88906023 A EP88906023 A EP 88906023A EP 0321581 B1 EP0321581 B1 EP 0321581B1
Authority
EP
European Patent Office
Prior art keywords
eraser
writing instrument
holder
guide member
guide
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
EP88906023A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0321581A1 (en
EP0321581A4 (en
Inventor
Kazumi Nakajima
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.)
Pentel Co Ltd
Original Assignee
Pentel 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
Priority claimed from JP1987114361U external-priority patent/JPH0624234Y2/ja
Application filed by Pentel Co Ltd filed Critical Pentel Co Ltd
Priority to EP93200572A priority Critical patent/EP0545917B1/en
Publication of EP0321581A1 publication Critical patent/EP0321581A1/en
Publication of EP0321581A4 publication Critical patent/EP0321581A4/en
Application granted granted Critical
Publication of EP0321581B1 publication Critical patent/EP0321581B1/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
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L19/00—Erasers, rubbers, or erasing devices; Holders therefor
    • B43L19/0056—Holders for erasers
    • B43L19/0068—Hand-held holders
    • B43L19/0075—Hand-held holders of the pencil type
    • B43L19/0081—Hand-held holders of the pencil type of the mechanical pencil type
    • 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
    • B43K21/08—Writing-core feeding mechanisms with the writing-cores fed by screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K24/00—Mechanisms for selecting, projecting, retracting or locking writing units
    • B43K24/02—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions
    • B43K24/06—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions operated by turning means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K29/00—Combinations of writing implements with other articles
    • B43K29/02—Combinations of writing implements with other articles with rubbers

Definitions

  • the present invention relates to a writing instrument which is capable of pushing out, as much as required, an elongated eraser through the rear end thereof, and more specifically, relates to a writing instrument of the type described above, which is convenient to use and which requires no complicated construction, a writing instrument excellent in productivity and capable of being produced at a low cost.
  • Japanese Utility Model Publication (Unexamined) No.57-132598(1982) discloses a structure in which a spiral groove formed on the inner surface of the rear barrel is engaged with projections of an approximately cylindrical eraser holder. The projections protrude through a slit provided in the lead container, the eraser being pushed out by rotating the rear barrel.
  • Japanese Utility Model Publication No.62-27438(1987) discloses a writing instrument structure enabling the eraser to be pushed out in the same manner as disclosed in the above-described publication No.57-132598 except that it utilizes the spiral groove of an elastic member in the form of spiral tube and a longitudinal groove formed in the rear barrel.
  • the eraser holder when the eraser is to be replaced with a new one, i.e., when the eraser holder has reached the most retreated position thereof, the eraser holder is positioned inside the barrel of the writing instrument, so that it is impossible to know when to replace the eraser. As a result, the user possibly rotates the rear barrel beyond its limit, which will damage the projections of the eraser holder or the spiral groove.
  • the former example has a relatively simple construction, but a stick of lead can be caught in the slit provided in the lead container, resulting in a malfunction. Further, it is necessary to remove the eraser each time leads are replenished.
  • the latter example is an improvement over the former one, in that the lead container is separated from the eraser-pushing-out mechanism (rear barrel).
  • fastening of the rear barrel is effected by a projection rotatably arranged in a pibot tube, so that it is deficient in reliability and may gradually become loose.
  • this example utilizes a coil-spring-like spiral tube, so that additional elements such as a pibot tube cap for preventing the eraser holder from falling, etc. must be provided, which leads to increased cost and a time-consuming assembly operation.
  • US Patent No. 2198335 discloses an automatic pencil with an eraser feeding mechanism.
  • the pencil has a rotatable barrel with internal threading.
  • a rider for the eraser has opposed wings which are in threadable engagement with the barrel and which move in longitudinal slots in a sleeve inside the barrel.
  • FR-1042788 discloses a lipstick container with a clip for holding the lipstick.
  • the clip When the clip is moved to the rear of the container, the clip automatically opens to release the used lipstick and to allow insertion of a new lipstick.
  • US-2409658 discloses a cosmetic container including a pair of concentric sleeves, each having a longitudinally extending slot, with a cosmetic cup mounted within the inner sleeve and having a projection entering both slots and one of the slots having a lateral or off-set portion into which the projection is moved at the end of its advancing movement to thereby lock the cosmetic cup against inadvertent retarding or retracting movement except by manual actuation of the operating member, and the invention also contemplates the provision of locking means maintained near the base of the holder, said last-mentioned locking means comprising an aperture in one of the sleeves with which a detent on a spring tongue on the cosmetic cup engages when the cup reaches its fully retracted position.
  • a principal object of the present invention is to provide a writing instrument overcoming the problems with the prior art.
  • Another object of the present invention is to provide a writing instrument which is capable not only of pushing out an alongated eraser as much as required, but also allowing an easy replacement thereof.
  • Still another object of the present invention is to provide a writing instrument which requires no complicated structure, and which excels in productivity and can be produced at low cost.
  • a writing instrument comprising a tubular member having a spiral groove, an eraser guide member having at least one longitudinal guide groove, and an eraser holder having a projection slidably arranged in the or each guide groove of said eraser guide member, characterised in that the eraser holder comprises a grip portion, rearward of the projection or projections, and that the guide groove or grooves of the eraser guide member are closed at the rear end thereof, whereby the grip portion of said eraser holder is capable of protruding beyond the rear end of the writing instrument when the eraser holder is at the most rearward position thereof.
  • Fig. 1-A shows a first embodiment of the present invention as applied to a mechanical pencil.
  • a front metal section 3 having a well-known lead detent member or a lead retainer 2 of a desired resilient material is screwed onto the front end of a barrel 1.
  • a lead container 5 Inside the barrel 1 is provided a lead container 5 with an adjacent chuck 4.
  • a spiral spring S is provided between the barrel 1 and the lead container 5, and a chuck ring 6 is slidably fitted over the front portion of the chuck 4.
  • a tubular member 7 has a spiral groove 7a and is held between a press-fitted ring 9 and a rear end flange 8b which are formed on an eraser guide member 8 and which serve to prevent an eraser holder 11, which is to be described later, from being detached and the eraser projection mechanism from being broken down.
  • the eraser guide member 8 is irrotatably arranged between the barrel 1 and the lead container 5 (see Fig. 1-B) and has longitudinal guide grooves 8a.
  • the tubular member 7 is rotatably arranged with respect to the eraser guide member 8.
  • the eraser holder 11 has a grip portion 11b for securing an eraser 10 and is inserted into the eraser guide member 8, and projections 11a of the eraser holder 11 protrude beyond the guide grooves 8a of the eraser guide member 8 and are engaged with the spiral groove 7a of the tubular member 7.
  • Fig. 2 shows a state in which the eraser holder 11 is placed at the most rearward position as a result of the continued pushing out operation of the eraser 10, and the grip portion 11b is shown to be protruded beyond the rear end.
  • the number of the slits and the width thereof can be determined as necessary. As for the groove, an appropriate number of them can extend over an entire circumference or only an appropriate portion thereof.
  • the grip portion 11b of the eraser holder for securing the eraser can protrude beyond the rear end of the pencil at the most rearward position thereof, which makes it possible to remind a user when to replace the eraser, facilitating at the same time the replacement operation.
  • Figs. 6 and 7 show a second embodiment of the present invention.
  • inwardly deformable arm portions 34 extend from a grip portion 31b of an eraser holder 31.
  • the arm portions 34 have projections 31a which engage with a spiral groove 27a of a tubular member 27 through guide grooves 28a of an eraser guide member 28.
  • slits 35 are provided in an approximately cylindrical eraser holder 31, thereby enabling it to be inwardly deformed.
  • the number and shape of slits 35 can be arbitrarily determined, and they may not be necessary if the eraser holder itself is made of an elastic material and is capable of inward deformation.
  • the tubular member 27 is rotated, and when the eraser holder 31 has reached the most rearward position thereof, any further rotation of the tubular member 27 causes the arm portions 34 in the vicinity of the projections 31a of the eraser holder 31 to undergo inward deformation and release the engagement of the projections 31a with the spiral groove 27a of the tubular member 27 and the guide grooves 28a of the eraser guide member 28, with the result that the tubular member 27 fails to engage and is free to rotate.
  • the tubular member 27 is rotated in the opposite direction in order to receive the eraser holder 31.
  • any further rotation thereof results in its failing to engage in the same manner as described above.
  • the portion in the vicinity of the projections 31a of the eraser holder 31 can be inwardly deformed, so that any damage to the eraser holder 31 or the tubular member 27 due to unnecessary rotation beyond the limitation where the eraser holder is at the most rearward or advanced end of the eraser holder 31 can be avoided.
  • Fig. 10-A shows a third embodiment of the present invention as applied to a known mechanical pencil.
  • a front metal section 43 having a well-known lead detent member 42 is screwed on the front portion of the barrel 41.
  • a lead container 45 including an adjacent chuck 44 at the front end portion thereof.
  • a spiral spring S is provided between the lead container 45 and the barrel 41, and a chuck ring 46 is slidably fitted over the front portion of the chuck 44.
  • a tubular member 47 having a spiral groove 47a is held between a rear end flange 48b of an eraser guide member 48 and a securing member 50.
  • the eraser guide member 48 is irrotatably arranged between the barrel 41 and the lead container 45.
  • the rear end flange 48b serves to prevent an eraser holder 51, which is to be described later, from being broken.
  • the securing member 50 is composed of a deformable C-ring (see Fig. 10-B) engaged with an engagement shoulder 49 of an eraser guide member 48 and having a cutout.
  • the section of the ring may be circular or polygonal, and the cutout may not be provided if the securing member itself has elasticity in the radial direction.
  • the tubular member 47 is rotatably arranged with respect to the eraser guide member 48.
  • the flange 48b may be formed as a member independent of the eraser guide member 48.
  • the flange and the engagement shoulder may be provided in the tubular member (see Fig. 14-A).
  • An eraser holder 51 adapted to secure the eraser guide member 48, and projections 51a of the eraser holder 51 protrude through the guide grooves 48a of the eraser holder 48 and engage with the spiral groove 47a of the tubular member
  • Fig. 10-A shows a known push-type mechanical pencil, in which the mechanism of the mechanical pencil in the front section is separated from the eraser pushing-out mechanism in the rear section.
  • the front section has an ordinary mechanical pencil mechanism, so that only the rear section, i.e. the eraser pushing-out mechanism, will be described.
  • the eraser holder 51 is inserted through the guide groove 48a of the eraser guide member 48 and slidably arranged with respect to the eraser guide member 48. If the guide groove 48a extends to the rear end of the eraser guide member 48, it can be inserted at this end. If, as shown in Fig. 11-A, the guide groove in the rear end portion is a narrow one, or if the guide groove 48a does not extend to the end of the eraser guide member and is formed integrally with the flange 48b,(Fig. 11-B), a desirable effect may be obtained in that the eraser holder is kept from being detached and the number of parts and elements can be reduced.
  • the portion in the vicinity of the guide groove 48a is deformable, insertion of the eraser holder 51 is facilitated.
  • a further desirable effect may be obtained by effecting chamfering or the like at the portion near where the guide groove 48a is in contact with the eraser holder 51.
  • the tubular member 47 is inserted into the eraser guide member 48 at the front end thereof until it abuts the flange 48b.
  • the securing member 50 is engaged from the front end of the eraser guide member 48. It is secured when returning to its normal state.
  • the eraser 10 is press-fitted into the eraser holder 51.
  • a member which has elasticity in the longitudinal direction for example, a coil spring, a one-turn spring (Fig. 12), or a ring having a plurality of flanges 50a (Fig. 13-B) or claws (Fig. 14-B) be adopted as the securing member 50.
  • the setting of the rotational loads which has been conventionally effected by friction, can then be conducted by adjusting the elasticity of the securing member, so that stable rotational loads can be obtained. Further, it is desirable to fix a ring 55 restraining the radial movement of the fixed securing member 50, as shown in Fig. 15, because this prevents the securing member from being detached.
  • continuous recesses 53a and projections 53b are provided in the tubular member 47 engaged with the securing member 50 and the engagement shoulder 49 or the opposing shoulder of the eraser guide member 48, respectively, it becomes possible to effect an appropriate resistance when rotating the tubular member 47, so that any unnecessary rotation during the eraser projection operation can be prevented as possible.
  • the number of the recesses 53a and the projections 53b may be one or more for each.
  • by adjusting the configuration and the number of the recesses 53a and projections 53b and the configuration of the securing member for example, projections 54 may be provided in a ring 50, as shown in Fig.
  • the above-described writing instrument has a simple construction in which a flange and an engagement shoulder are formed in either the tubular member or the eraser guide member, and the tubular member is rotatably secured to the eraser guide member by merely engaging a deformable securing member with the engagement shoulder.
  • the tubular member is then held between the flange and the securing member. Accordingly , the writing instrument of the present invention is easily assembled.
  • the securing member is positively engaged with the engagement shoulder, securing reliability can be maintained for a long period of time.
  • the eraser guide member may, as to the case with the prior art shown, be provided exteriorly (the guide grooves are then formed into longitudinal grooves, instead of slit-like ones) and the tubular member having a spiral groove may be provided interiorly.
  • the spiral groove can then be a spiral tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Knives (AREA)
EP88906023A 1987-06-27 1988-06-22 Writing utensil Expired - Lifetime EP0321581B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93200572A EP0545917B1 (en) 1987-07-25 1988-06-22 Writing instrument

Applications Claiming Priority (11)

Application Number Priority Date Filing Date Title
JP9918787 1987-06-27
JP99187/87U 1987-06-27
JP1987114361U JPH0624234Y2 (ja) 1987-07-25 1987-07-25 筆記具
JP114360/87U 1987-07-25
JP11436087 1987-07-25
JP114359/87U 1987-07-25
JP11435987 1987-07-25
JP114361/87U 1987-07-25
JP11499687 1987-07-27
JP114996/87U 1987-07-27
PCT/JP1988/000616 WO1988010198A1 (en) 1987-06-27 1988-06-22 Writing utensil

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP93200572A Division EP0545917B1 (en) 1987-07-25 1988-06-22 Writing instrument
EP93200572.1 Division-Into 1993-03-02

Publications (3)

Publication Number Publication Date
EP0321581A1 EP0321581A1 (en) 1989-06-28
EP0321581A4 EP0321581A4 (en) 1990-12-05
EP0321581B1 true EP0321581B1 (en) 1995-03-15

Family

ID=27525947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88906023A Expired - Lifetime EP0321581B1 (en) 1987-06-27 1988-06-22 Writing utensil

Country Status (4)

Country Link
EP (1) EP0321581B1 (ko)
KR (2) KR890701377A (ko)
DE (1) DE3853348T2 (ko)
WO (1) WO1988010198A1 (ko)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5193927A (en) * 1989-03-24 1993-03-16 Kotobuki & Co., Ltd. Mechanical pencil having propelling device for a bar shaped article
DE69308191T2 (de) * 1992-12-03 1997-09-18 Kotobuki & Co Ltd Schreibgerät
JP2585911Y2 (ja) * 1993-04-12 1998-11-25 株式会社壽 棒状物繰り出し容器
JP3501418B2 (ja) * 1994-07-22 2004-03-02 株式会社壽 サイドノック式シャープペンシル
JPH10175395A (ja) * 1996-12-19 1998-06-30 Kotobuki Kk 棒状物繰り出し装置付き容器
TW356768U (en) * 1997-03-03 1999-04-21 Kotobuki & Co Ltd Double-chuck type mechanical pencil
DE10159955A1 (de) 2001-12-06 2003-06-26 Clariant Gmbh Verwendung von polar modifizierten Polyolefinwachsen in Fototonern
FR2926244B1 (fr) 2008-01-16 2010-02-19 Bic Soc Instrument d'ecriture muni d'une gomme protegee par un manchon
CN104290497B (zh) * 2014-10-15 2017-03-22 雷东玉 自动铅笔
JP6778611B2 (ja) 2016-12-27 2020-11-04 株式会社パイロットコーポレーション 熱変色性筆記具

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2198335A (en) * 1939-05-08 1940-04-23 Gaimari Angelo Eraser feeding mechanism
JPS5352520Y2 (ko) * 1975-05-23 1978-12-15
JPS6227438Y2 (ko) * 1981-11-16 1987-07-14

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124245A (en) * 1964-03-10 Lipstick container
US2409658A (en) * 1945-05-04 1946-10-22 Eyelet Specialty Co Cosmetic container
BE488902A (ko) * 1948-05-10
FR989522A (fr) * 1949-06-24 1951-09-10 Bimeca étui à fard à double usage
CH289203A (de) * 1951-01-29 1953-02-28 Victor Grisel Yvan Gerät für die Aufnahme eines Lippenstiftes.
FR1123390A (fr) * 1955-03-10 1956-09-20 Bâtonnets décolorant l'encre
JPS53101840U (ko) * 1977-01-20 1978-08-17
FR2574640B1 (fr) * 1984-12-18 1987-02-13 Oreal Dispositif pour appliquer un produit pateux, notamment un produit cosmetique tel que du rouge a levres, et element tubulaire pour un tel dispositif
JPS61201614U (ko) * 1985-06-07 1986-12-17

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2198335A (en) * 1939-05-08 1940-04-23 Gaimari Angelo Eraser feeding mechanism
JPS5352520Y2 (ko) * 1975-05-23 1978-12-15
JPS6227438Y2 (ko) * 1981-11-16 1987-07-14

Also Published As

Publication number Publication date
EP0321581A1 (en) 1989-06-28
KR890701377A (ko) 1989-12-20
KR960000698Y1 (en) 1996-01-25
EP0321581A4 (en) 1990-12-05
WO1988010198A1 (en) 1988-12-29
DE3853348T2 (de) 1995-12-14
DE3853348D1 (de) 1995-04-20

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