EP0088318A2 - Porte-mines avec avance automatique de la mine provoquée par la pression d'écriture - Google Patents

Porte-mines avec avance automatique de la mine provoquée par la pression d'écriture Download PDF

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Publication number
EP0088318A2
EP0088318A2 EP83101906A EP83101906A EP0088318A2 EP 0088318 A2 EP0088318 A2 EP 0088318A2 EP 83101906 A EP83101906 A EP 83101906A EP 83101906 A EP83101906 A EP 83101906A EP 0088318 A2 EP0088318 A2 EP 0088318A2
Authority
EP
European Patent Office
Prior art keywords
clamping
collet
lead
pencil according
rolling
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.)
Withdrawn
Application number
EP83101906A
Other languages
German (de)
English (en)
Other versions
EP0088318A3 (fr
Inventor
Otto Dipl.-Ing. Katz
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.)
Faber Castell AG
Original Assignee
AW Faber Castell GmbH and Co
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
Application filed by AW Faber Castell GmbH and Co filed Critical AW Faber Castell GmbH and Co
Publication of EP0088318A2 publication Critical patent/EP0088318A2/fr
Publication of EP0088318A3 publication Critical patent/EP0088318A3/fr
Withdrawn legal-status Critical Current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
    • B43K21/033—Writing-core feeding mechanisms with sliding tubelike writing-core guide with automatic feed by pressure during use of pencil

Definitions

  • the invention relates to a refill pen with automatic feed of the lead caused by the writing pressure, which can be clamped in a longitudinally displaceable collet, which has two radially resilient clamping jaws, which stand in the axial direction under the action of a compensating spring and bear against an inner cone by means of rolling elements and which in a, guided in the tip against spring pressure longitudinally movable mine guide tube, with which a brake member is connected, which abuts the mine by friction.
  • the aforementioned, so-called forward spring on the mine guide tube must have sufficient tension to apply an axial force that is sufficient to pull the lead out of the closed collet with the help of the brake member during the forward movement of the mine guide tube and to move it to the starting position.
  • the opening and closing of the collet which has to absorb the relatively high writing pressure acting on the lead, must take place along the shortest longitudinal paths within the clamping sleeve with the inner cone.
  • the collet must automatically support the lead against the writing pressure in the manner of a directional lock, but in the opposite direction, with the smallest possible axial path relative to the inner cone, release the lead at least to such an extent that the friction in the clamping bore of the collet is less than the vcm Brake member applied to the mine guide tube.
  • a refill pin in which clamping elements are provided, on which acts a so-called compensating spring, which is weaker than the so-called forward spring directed against the longitudinally displaceable lead guide tube.
  • This ensures that the movement of the mine guide tube out of the pen tip, the clamping elements can be released in order to present the lead, which has become shorter due to wear, together with the mine guide tube, back to the starting position.
  • the frictional forces during the longitudinal movement necessary to open and close the clamping elements or the collet, relative to the inclined guide surfaces in the inner cone, are reduced by rolling elements; this applies in particular to the static friction occurring in the clamped state, which has to be overcome by the advance spring in order to initiate the movement of the mine guide tube.
  • the clamping elements should also be easily detachable from the lead, so that the lead is largely slip-free when the lead guide tube moves out of the pen tip under the action of the lead spring and with the help of the braking element;
  • Another, according to DE-OS 27 29 320 refill pencil contains a so-called driver element to improve the writing properties on the mine guide tube instead of a braking element, which acts in both directions, which also - similar to the clamping elements or the collet - in the manner of a direction-dependent locking mechanism is effective.
  • a refill pencil in which rolling elements are also used in the collet's bearing pockets. These bearing pockets are designed so that the rolling elements in the starting position (Fig. 3 and 4) lie at the lowest point and from there, during the axial movement of the collet, would have to roll on a steep or steeply progressively rising trajectory. Because of the increasingly steep rise, however, rolling can either not take place at all, or can only take place over a short distance, since, due to the sharp rise in the friction component, the rolling movement changes into a sliding movement.
  • a sliding movement of the rolling elements in the pocket and on the inner cone also occurs when the bearing pockets have the shape of a longitudinal groove in the direction of the mine axis (FIGS. 6 and 7).
  • the rolling elements can come to rest on the lower boundary surface when the collet is open, with the writing tip usually pointing downwards, and therefore cannot roll when the writing pressure occurs and the necessary short axial movement of the collet occurs, since there is no longer a rolling path available stands.
  • the writing pressure in the axial direction can already have a size of more than 1000 p, this means that on the clamping arms and in the clamping cone, much higher radial. Components occur in order to absorb the writing pressure in the clamping bore of the collet. Since these conditions have to be taken into account when selecting the material, until now only the use of rolling elements, the collet and the inner cone were made of metal. The applicable manufacturing processes for processing metal have so far only made it possible to touch the point of contact of the rolling elements. The functionally necessary shape of these parts could also only be reproduced by complex work processes, in particular machining. Due to the high precision of these parts, which is essential, constant checks during production are necessary to ensure that the tools are worn in time, i.e. in order to comply with the required tolerances. to be able to compensate for tolerances.
  • the design of the technical functional details of the parts that can be used to optimize the function of the refill pencil is subject to narrow limits. Particularly due to the small dimensions when using thin fine leads with a diameter of less than 0.5 mm, for example, machining of the clamping bore is only possible with the help of rotating, cutting precision tools, which are extremely fragile due to the required hardness.
  • the high stress on the collet, the rolling elements and the inner cone make the material selection more difficult because both the high compressive forces at the contact points of the individual parts have to be absorbed and there must be sufficient self-suspension on the clamping arms.
  • Machinability must also be taken into account as a further criterion. It has proven to be expedient to manufacture the brass collet due to the good machinability and to increase the load-bearing capacity, in particular the permissible surface pressure, by applying a hard chrome layer. All of these measures, which are essential for proper functioning, make the manufacture of such refill pencils more expensive.
  • the object of the invention is to provide a refill pen, the collet of which can transmit a high holding force to the mine for supporting the writing pressure in the case of short paths and which, in the case of likewise short paths, is easily detachable.
  • the user should not have to apply any other perceptible forces that adversely affect the writing experience.
  • the collet must therefore be displaceable in the opening and closing directions while overcoming the lowest possible frictional forces.
  • the individual parts should be able to be designed to be functional, and a constant, high level of accuracy, even in the case of large quantities, must be achievable.
  • the collet can be produced with particularly high manufacturing accuracy in simple casting molds in that the collet is composed of two identical parts which have a flat connecting surface on the guide head, and through a feed hole for the mine in two Sections is divided, one of which has a web and the other has a recess adapted to it.
  • the refill pencil according to the invention shown in longitudinal section in FIG. 1 consists of a housing 1 which is connected in a conventional manner by a suitable connection such as e.g. a thread, is connected to the tip 2.
  • a clamping bush 3 is inserted, which is oriented in its position in a centering hole 4 of the tip 2 by resting on a support collar 5.
  • the sliding part 9 has a brake member 11, which is known in various embodiments and which, in the example, has the shape of a rubber ring inserted into a groove, which grips the lead 12 by friction.
  • a brake member 11 which is known in various embodiments and which, in the example, has the shape of a rubber ring inserted into a groove, which grips the lead 12 by friction.
  • the pre-tensioning spring 14 is placed on the sliding part 9 with a prestress.
  • the collet 15 is mounted in the clamping bush 3 so that it can move longitudinally.
  • FIGS. 15 and 16 show a collet composed of two identical parts. It essentially consists of a guide head 16, which here is composed of two parts on a flat connecting surface 17. This connecting surface 17 is divided by the feed bore 18 for the mine 12 into two sections 19 and 20, one of which has a web 21 and the other a recess 22 adapted to the dimensions of the web 21.
  • This design makes it possible to put two identical parts together, which results in the guide head 16, which has an annular collar 23 to which a half-shell-shaped spring arm 24 connects, to which in turn a clamping jaw 25 is formed.
  • the feed bore 18 merges into a clamping bore 26 (FIGS. 10, 12, and 14) which is formed from the respective clamping grooves 27 in the clamping jaws 25.
  • the clamping groove 27 consists of V-shaped, inclined side walls 28 which are connected at their tip by a radius 29.
  • a bearing pocket 30 is also formed, which consists of a rolling path 32 rising from the central axis 31 towards the tip 2, to which, at its lowest point, a support surface 34 that rises towards the end of the pin, similar to an apex 33.
  • the bearing pocket 30 serves to receive a rolling element 35, which in the rest position of the collet 15 bears against the rolling track 32 and against the support surface 34.
  • the bearing pocket 30 is recessed into the clamping jaw 25 and is delimited on the rolling track 32 by the side wall 32.1 and on the support surface 34 by the side wall 34.1.
  • the open position of the collet 15 is to be understood as the position shown in FIGS. 1 and 2, in which the lead 12 is not touched by the clamping bore 26.
  • the diverging clamping jaws 25 rest against an inner cone 36 by means of rolling elements 35 and the clamping bush 3.
  • a shoulder 37 is formed behind the inner cone 36, to which a guide bore 38 connects, in which the guide head 16 of the collet 15 is guided.
  • a compensating spring 39 is inserted under prestress, which prevents the collet 15 from coming out of the inner cone 36 due to the self-springing of the spring arms 24.
  • a lead container 40 is guided in the guide bore 38 of the clamping bush 3, which has an inlet funnel 41 for the leads 12 at its front end and is closed by an actuating button 42.
  • a compression spring 44 is clamped between a support rim 43 formed on the actuation button 42 and the clamping bush 3, which brings the actuation button 42 firmly attached to the mine container 40 to abut against a stop 45 in the housing 1.
  • 11 and 12 show a further embodiment of the subject matter of the invention, in which the inner cone 36 in the clamping bush 3 is formed by a trough 50 which is inclined at an angle.
  • a ball is also provided as the rolling element 51, which is adapted to the cross-sectional shape of the channel 50.
  • FIGS. 13 and 14 two further exemplary embodiments are shown, wherein in the upper half of FIGS. 13 and 14 a rolling element 53, which is designed as a barrel, bears directly against the inner cone 36 of the clamping bush 3.
  • the barrel-shaped rolling element 53 is designed such that its shell shape is adapted to the part of the inner cone 36 which is acted upon when the rolling element 53 assumes the position shown in FIG. 5 during the writing process.
  • FIGS. 13 and 14 an embodiment is shown, in which a barrel-shaped rolling element 53 is also used, which, however, does not rest directly in the inner cone 36, but in a channel 52 formed therein, so that a linear contact of the rolling element 53 in each Operating position of the refill pin is ensured.
  • the refill pencil according to the invention is shown in the four different operative positions of the functional parts, which are essential in use; in particular, the respective position of the rolling elements between the rolling track and the collet and in the inner cone is highlighted in a greatly enlarged manner.
  • a lead 12 accommodated in the lead container 40 In order to bring the pen into writing standby, a lead 12 accommodated in the lead container 40 must first be transported to the end of the lead guide tube 10. For this purpose, the actuation button 42 must be pressed, whereby the collet 15 is opened in accordance with FIG. 1. The mine 12 thus falls up to the brake member 11 on the sliding part 9, which it cannot penetrate automatically. In order to transport the lead 12 to the end of the lead guide tube 10, the actuating button 42 must be released again and the lead guide tube 10 must be pressed against a base as shown in FIG. 5.
  • the sliding part 9 and also the brake member 11 are pushed onto the lead 12 held in the collet 15.
  • the lead 12 is pulled out of the collet 15 and moved forward relative to the tip 2.
  • the mine 12 reaches the front end of the mine guide tube 10. This state is shown in FIG. 1, i.e. the mine 12 is flush with the front end of the mine guide tube 10 and in readiness to write.
  • this is moved by the actuating button 42, which moves the mine container 40 against the action of the compression spring 44, also towards the pen tip 2, against the action of the compensating spring 39, until the clamping jaws 25 are opened so far due to the inclination of the inner cone 36 are that the mine 12 is no longer in the clamping bore 26.
  • the magnitude of the radially outward spring force of the clamping jaws 25 in connection with the angle of inclination ⁇ on the support surface 34 and the angle of inclination ⁇ on the inner cone 36 causes the rolling element 35 to slide along the outer surface of the inner cone 36 and to remain at the apex 33.
  • the lead 12 or lead guide tube 10 is placed on a base, the lead guide tube 10 is shifted into the tip 2 in accordance with the writing pressure applied.
  • the advance spring 14 (FIG. 7) becomes effective, which moves the sliding part 9 to the front stop in the tip 2.
  • the sliding part 9 with the brake member 11 has been pushed back over the lead 12 clamped in the collet 25, so that the frictional connection between the brake member 11 and the lead 12 now moves it with the sliding part 9 out of the tip 2 .
  • a lead 12 can be brought forward with the aid of the sliding part 9 until the lead 12 has completely left the clamping bore 26 or is no longer supported against the writing pressure in the clamping bore 26 due to the shortness of its length available for clamping can be.
  • the lead tube 10 will easily penetrate into the tip 2 when the pen tip is placed on a base.
  • the user must manually move the mine guide tube 10 back until the mine looks out of it, which can then also be pulled out by hand. After removing the rest of the lead, the pen is to be put in writing again, as already described.

Landscapes

  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
EP83101906A 1982-03-05 1983-02-26 Porte-mines avec avance automatique de la mine provoquée par la pression d'écriture Withdrawn EP0088318A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3207923 1982-03-05
DE19823207923 DE3207923C2 (de) 1982-03-05 1982-03-05 Feinminenstift mit durch den Schreibdruck bewirktem automatischem Vorschub der Mine

Publications (2)

Publication Number Publication Date
EP0088318A2 true EP0088318A2 (fr) 1983-09-14
EP0088318A3 EP0088318A3 (fr) 1985-07-10

Family

ID=6157392

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101906A Withdrawn EP0088318A3 (fr) 1982-03-05 1983-02-26 Porte-mines avec avance automatique de la mine provoquée par la pression d'écriture

Country Status (3)

Country Link
EP (1) EP0088318A3 (fr)
JP (1) JPS58201696A (fr)
DE (1) DE3207923C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146128A2 (fr) * 1983-12-15 1985-06-26 Micro Co., Ltd. Porte-mine automatique
US4571105A (en) * 1983-10-03 1986-02-18 Pentel Kabushiki Kaisha Lead engaging chuck mechanism for mechanical pencil
EP0268398A1 (fr) * 1986-10-30 1988-05-25 KOTOBUKI & CO., LTD. Pince de serrage pour un porte-mine
US5509743A (en) * 1992-12-15 1996-04-23 Hao; Yu Cartridge for automatic pencil
US6011084A (en) * 1998-06-26 2000-01-04 Binney & Smith Inc. Erasable colored pencil lead

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3336959C2 (de) * 1983-10-11 1994-09-22 Pentel Kk Spannzangenmechanismus für einen mechanischen Bleistift
JPS60191489U (ja) * 1984-05-31 1985-12-19 ぺんてる株式会社 ノツク式シヤ−プペンシル
JPS6225589U (fr) * 1985-07-30 1987-02-17
JPS62114788U (fr) * 1986-01-13 1987-07-21
DE3906806A1 (de) * 1989-03-03 1990-09-06 Staedtler Fa J S Klemmzange fuer fuellminenstifte
DE102004028310B9 (de) 2004-06-12 2010-10-07 Schott Ag Verfahren und Vorrichtung zum Herstellen des Abschlusses eines Lichtleitfaserbündels
JP7098297B2 (ja) * 2017-10-06 2022-07-11 ゼブラ株式会社 シャープペンシル

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2452906A (en) * 1946-06-07 1948-11-02 Collura Francesco Mechanical pencil of the pushbutton type
DE2447431A1 (de) * 1974-10-04 1976-04-08 Faber Castell A W Fuellminenstift mit schrittweise verschiebbarer mine
DE2729320A1 (de) * 1977-06-29 1979-01-11 Katz Otto Fuellminenstift mit durch den schreibdruck bewirktem, automatischem vorschub der mine
GB2001011A (en) * 1977-07-12 1979-01-24 Faber Castell A W Propelling pencil
JPS55160881U (fr) * 1979-05-09 1980-11-19
DE3112869A1 (de) * 1980-03-31 1982-02-04 Pentel K.K., Tokyo "minenschreibermechanik"

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE824454C (de) * 1948-10-02 1951-12-10 Albert Dinser Schreibstift
DE2260065C3 (de) * 1972-12-08 1979-07-19 Fa. A.W. Faber-Castell, 8504 Stein Fallminenstift mit verschiebbarer Mine
US4140408A (en) * 1976-08-20 1979-02-20 Pentel Kabushiki Kaisha Push type mechanical pencil
JPS5535178U (fr) * 1978-08-30 1980-03-06
JPS56137997A (en) * 1980-03-31 1981-10-28 Pentel Kk Nose knock type propelling pencil

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2452906A (en) * 1946-06-07 1948-11-02 Collura Francesco Mechanical pencil of the pushbutton type
DE2447431A1 (de) * 1974-10-04 1976-04-08 Faber Castell A W Fuellminenstift mit schrittweise verschiebbarer mine
DE2729320A1 (de) * 1977-06-29 1979-01-11 Katz Otto Fuellminenstift mit durch den schreibdruck bewirktem, automatischem vorschub der mine
GB2001011A (en) * 1977-07-12 1979-01-24 Faber Castell A W Propelling pencil
JPS55160881U (fr) * 1979-05-09 1980-11-19
DE3112869A1 (de) * 1980-03-31 1982-02-04 Pentel K.K., Tokyo "minenschreibermechanik"

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571105A (en) * 1983-10-03 1986-02-18 Pentel Kabushiki Kaisha Lead engaging chuck mechanism for mechanical pencil
EP0146128A2 (fr) * 1983-12-15 1985-06-26 Micro Co., Ltd. Porte-mine automatique
EP0146128A3 (fr) * 1983-12-15 1985-07-24 Micro Co., Ltd. Porte-mine automatique
EP0268398A1 (fr) * 1986-10-30 1988-05-25 KOTOBUKI & CO., LTD. Pince de serrage pour un porte-mine
US4872776A (en) * 1986-10-30 1989-10-10 Kotobuki & Co., Ltd. Lead chuck of mechanical pencil
EP0383412A2 (fr) * 1986-10-30 1990-08-22 KOTOBUKI & CO., LTD. Pince de serrage pour un porte-mine
EP0383412A3 (fr) * 1986-10-30 1991-04-24 KOTOBUKI & CO., LTD. Pince de serrage pour un porte-mine
US5509743A (en) * 1992-12-15 1996-04-23 Hao; Yu Cartridge for automatic pencil
US6011084A (en) * 1998-06-26 2000-01-04 Binney & Smith Inc. Erasable colored pencil lead

Also Published As

Publication number Publication date
DE3207923C2 (de) 1984-05-17
JPS58201696A (ja) 1983-11-24
DE3207923A1 (de) 1983-09-15
EP0088318A3 (fr) 1985-07-10

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Inventor name: KATZ, OTTO, DIPL.-ING.