EP0756946B1 - Crayon dont la virole support de gomme est fixée par soudure ultra-sons et virole spécialement adaptée - Google Patents

Crayon dont la virole support de gomme est fixée par soudure ultra-sons et virole spécialement adaptée Download PDF

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Publication number
EP0756946B1
EP0756946B1 EP96490027A EP96490027A EP0756946B1 EP 0756946 B1 EP0756946 B1 EP 0756946B1 EP 96490027 A EP96490027 A EP 96490027A EP 96490027 A EP96490027 A EP 96490027A EP 0756946 B1 EP0756946 B1 EP 0756946B1
Authority
EP
European Patent Office
Prior art keywords
pencil
ferrule
rear end
shoulder
ultrasonic welding
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
EP96490027A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0756946A1 (fr
Inventor
André Coinon
Zoltan Trajber
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.)
Conte SA
Original Assignee
Conte SA
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 Conte SA filed Critical Conte SA
Publication of EP0756946A1 publication Critical patent/EP0756946A1/fr
Application granted granted Critical
Publication of EP0756946B1 publication Critical patent/EP0756946B1/fr
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
    • 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 pencil, with a central lead, the rear end of which is provided with an eraser housed in a ferrule as described in document US-A-3262425. It also relates to a ferrule made of a thermoplastic material and specially adapted to serve as a housing for an eraser to be fixed to the end of a pencil.
  • Pencils with a graphite center lead are sometimes fitted, at their uncut end, with a small eraser, fixed in line with the pencil.
  • This fixing is obtained by means of a part, called a ferrule, which allows the pencil and eraser to be assembled. Conventionally, it is a generally aluminum part, which has a cylindrical shape.
  • the fixing itself is obtained by crimping, that is to say by locally deforming the cylindrical walls of the ferrule so that the deformations serve as anchoring zones both in the pencil and in the eraser.
  • the traditional aluminum ferrule if it is perfectly effective, has the disadvantage of being limited on the decorative level, on the one hand by the deformation of the crimping and on the other hand by the limited number of colors and shapes.
  • the aim set by the applicant is to propose a pencil with a central lead which is provided with a ferrule for a plastic eraser tip, the range of colors of which is not limited and the external appearance of which can take all possible forms, in particular if such a shell is produced by molding.
  • Plastic ferrules have already been proposed, with a central partition delimiting two housings, one for the rear end of the pencil and the other for one end of the eraser, the connection between the ferrule and the pencil being obtained by gluing.
  • the bonding technique poses great difficulties of implementation in industrial production, in particular in the case of machine stops.
  • the ferrule must be sufficiently fixed to the end of the pencil so as not to be able to be detached from the latter in the case where a certain traction is exerted between the pencil and the ferrule, in the case of erasing, which is not always respected by bonding.
  • the pencil body and the ferrule are made of compatible thermoplastic materials and the ferrule is fixed to the rear end of the pencil by localized interpenetration of said thermoplastic materials in at least one ultrasonic welding zone.
  • thermoplastic material having sufficient attachment.
  • thermoplastic materials compatible, between the shell and the body of the pencil surrounding the mine and on the other hand thanks to the interpenetration of the materials in the welding zone.
  • the attachment it is necessary that there is a certain interpenetration of the materials constituting the shell on the one hand and the peripheral body, surrounding the mine, on the other hand.
  • thermoplastic materials of the shell and of the body of the pencil are both based on ABS (Acrylonitrile Butadiene Styrene).
  • the proportion of dyes in the thermoplastic material constituting the ferrule is substantially the same as that existing in the material constituting the peripheral body. pencil. Too large a difference in the proportion of dyes between these two elements significantly reduces this bonding.
  • the attachment between the ferrule and the rear end of the pencil could also depend on the density of the thermoplastic material of the peripheral body of the pencil, in the ultrasonic welding zone.
  • the wood material surrounding the mine is an expanded material. The purpose of this expansion is to obtain a plastic pencil which has substantially the same density as traditional wooden pencils.
  • the attachment between the shell and the expanded material of the peripheral body could be less efficient in the case of a particularly expanded material, having a density of between 0.5 and 0.6.
  • the rear end of the peripheral body of the pencil comprises a constriction, produced by compression, intended to locally increase the density of the expanded material of the peripheral body.
  • the shell in which the eraser is housed can have any suitable shape, provided that it has a contact zone with the thermoplastic material of the outer body, capable of constituting an ultrasonic welding zone.
  • the shell can be made, in a very simple manner, with a cylindrical housing for the rubber, closed at one end by a transverse bottom. In this case, it is at the bottom that the ultrasonic welding zone is located.
  • the shell unlike aluminum ferrules, it does not have cylindrical walls strictly speaking surrounding the rear end of the pencil.
  • the ferrule also has a cylindrical wall, like traditional aluminum ferrules.
  • the rear end of the body of the pencil has a constriction which is arranged so that after fixing the ferrule on said end, the outer face of the ferrule is substantially in the extension of the outer face of the peripheral body pencil, whether it is cylindrical or polygonal.
  • This particular embodiment makes it possible to obtain an original decorative effect, in which the outside diameter of the pencil is uniform over its entire length, including at the level of the ferrule.
  • this ferrule made of thermoplastic material, has a cylindrical shape with a transverse bottom, the outer face of which has a shoulder forming an energy director for ultrasonic welding, said shoulder being situated outside a circular central zone. , intended to be opposite the graphite mine.
  • the shoulder in question has an annular shape. This allows a uniform distribution of the weld to be obtained.
  • a shoulder having an annular shape has in cross section a symmetrical shape having a rectangular portion terminated in point by a triangular portion.
  • the height of the shoulder was of the order of 1mm, of which 0.6mm for the rectangular portion and 0.4mm for the triangular portion, the thickness of the shoulder was, in the portion rectangular, about 0.4mm.
  • the annular shoulder had an outside diameter of about 5mm.
  • the annular shoulder forming an energy director for ultrasonic welding, is positioned substantially, concentrically with the axis of the pencil, at equal distance between the graphite lead and the outer face of the peripheral body.
  • the bottom of the shell is provided with a central orifice whose diameter is greater than the given diameter of said lead.
  • the thermoplastic materials involved can be caused to creep.
  • the presence of the central opening makes it possible to maintain perfect alignment between the pencil and the ferrule, despite such creep, since the material in question, instead of locally creating an additional thickness in the weld zone, escapes through this opening central.
  • the shell of the invention present on the inner face of the eraser housing, a plurality of regularly distributed longitudinal grooves.
  • the advantage of this embodiment resides in the possibility of using, for ultrasonic welding, a sonotrode comprising a cylindrical end piece having a diameter adapted to penetrate the fitting housing of the ferrule.
  • the positioning of the ferrule on the sonotrode is facilitated by the fact that the ferrule remains locked in position on the end fitting, once it has been positioned there.
  • These same grooves have another function of serving as means for anchoring the rubber in its housing. The rubber is forced into said housing. The grooves, which locally crush the rubber, prevent it from being easily removed from the shell.
  • the longitudinal grooves can be partially crushed, due to the heating due to the vibration of the sonotrode. However, this slight crushing does not alter the fixation of the rubber in the shell.
  • the object of the present invention is a pencil 1 with graphite lead 2 which is provided towards its rear end 3, opposite the cut part 4 of a ferrule 5 serving as a housing for an eraser 6.
  • the body 7 of the pencil, surrounding the graphite lead 2 and the ferrule 5 are made of compatible thermoplastic materials. It may in particular be the same thermoplastic material, such as ABS or also two thermoplastic materials of good compatibility, in particular a polystyrene ferrule and the external body 7 of the pencil in ABS.
  • the ferrule 5 is fixed to the rear end of the pencil itself 8 is obtained by localized interpenetration of said thermoplastic materials in at least one zone 9 of ultrasonic welding.
  • the shell 5 consists of a hollow and cylindrical part 10 with a rear end 11 open and a front end 12 closed by a bottom 13 whose outer face 13 a is provided with an energy director 14 capable of promoting ultrasonic welding with the thermoplastic material of the outer body 7 of the rear end 3 of the pencil 8.
  • the bottom 13 of the shell 5 is pierced with a circular opening 15, the diameter D1 of which is greater than the diameter d1 of the graphite lead 2.
  • the energy director 14 has an annular shape whose diameter D2 is greater than the diameter D1 of the orifice 15.
  • the energy director 14 is applied under constant pressure against the rear face 16 of the pencil 8 so that the longitudinal axis of the graphite lead 2 coincides with the axis of symmetry of the ferrule 5. In this position, the energy director 14 is located opposite the external body 7 of the pencil 8. The action of the ultrasounds causes a localized fusion of the thermoplastic materials constituting the energy director 14 and the zone of the outer body 7, so that there is an interpenetration of the corresponding thermoplastic materials. After a cooling time, the ferrule is attached to the rear face 16 of the pencil 8.
  • the presence of the orifice 15 allows possible creep of the thermoplastic materials through said orifice 15, creep which prevents a localized excess of material and therefore a misalignment of the ferrule 5 relative to the pencil 8.
  • the peripheral face of the rod 8 is aligned with the external face of the ferrule 5.
  • the energy director cannot be positioned in a zone which is opposite the graphite mine 2. Indeed, even if the graphite mine would itself be based on a thermoplastic material compatible with that of the ferrule, it has been observed that the presence of graphite prevents the attachment which is necessary to have a good fixation after ultrasonic welding.
  • thermoplastic materials which have substantially the same proportion of dyes both in the shell 5 and in the outer body 7 of the pencil 8.
  • a first difference resides in the constriction 17 situated at the rear end 3 of the rod 8.
  • This constriction 17 is obtained by the localized compression of this rear end 3, compression which is carried out for example in a heated metallic conformator.
  • the shape of the neck 17 is here frustoconical.
  • the advantage of this constriction is to increase the attachment between the ferrule 18 and the outer body 7 of the pencil 8 when the thermoplastic material of said body 7 is particularly expanded.
  • the compression generated by the formation of the constriction 17 locally increases the density of said thermoplastic material in the zone which is intended to form the ultrasonic weld.
  • the second difference lies in the presence of a skirt 19 which extends the annular upright 20 forming, in the ferrule 18 the housing for the rubber 6.
  • This annular skirt 19 fulfills several functions. It has an aesthetic role since it makes it possible to hide the connection zone between the bottom 21 of the ferrule 18 and the rear end 3 of the rod 8, in particular any burrs liable to form by creep of the thermoplastic materials in the zones of ultrasonic welding.
  • the skirt 19 also has a function of centering and aligning the pencil 8 and the ferrule 18 in the ultrasonic welding installation.
  • thermoplastic material constituting the ferrule and the external body 7 of the pencil 8 in certain contact zones, for example in zone 22 illustrated in the figure 3.
  • the rear end 3 of the pencil 8 had a second constriction 23, allowing perfect alignment of the external faces of the ferrule 18 and of the pencil 8.
  • a third difference between the first example and the second illustrated in FIG. 3 resides in the presence of longitudinal internal grooves 24 along the annular upright 20 of the shell 18.
  • These longitudinal grooves 24 regularly distributed, for example six grooves spaced apart by a 60 ° angle, have a double function. They allow the perfect adaptation of the ferrule 18 on the sonotrode 25 of the ultrasonic welding installation. In the case in point this sonotrode 25 has a cylindrical end piece 26 whose dimensioning is such that the ferrule 18 can be positioned perfectly around this end piece 26, without play.
  • this deformation is not prohibitive and does not prevent the longitudinal grooves 24 from fulfilling their second function which is to ensure the blocking in position of the rubber 6 when it is forced into the internal housing 11 of the shell. 18.
  • the face 27 a of the bottom 27 of the shell 18 is provided with an energy director 28, having the same shape as that of the first example. It is a ring-shaped shoulder having a cross-section a symmetrical shape with a portion adjacent to the face 27 a of the bottom 27, rectangular tapering by a triangular portion.
  • the best results have been obtained with a shoulder of approximately 1mm in height, 0.6mm for the rectangular portion and 0.4mm for the triangular portion, the thickness of the shoulder being 0.4mm.
  • This result was obtained for a pencil of approximately 8mm in diameter, with an annular shoulder, forming energy director 28, with an external diameter of approximately 5mm. Under these conditions, the annular shoulder was located substantially outside of the graphite mine 2 in a concentric median zone between the graphite mine and the outside face of the pencil 8.
  • the internal diameter of the skirt 19 is slightly less than the highest external dimension of the pencil. In this case it is the longitudinal edges of the pencil which act as an additional area 22 for ultrasonic welding.
  • thermoplastic materials constituting the shell and the outer body of the pencil.
  • the invention is not limited to the embodiments which have been described by way of non-exhaustive examples.
  • shape of the possible shrinkage (s), the shape and the color of the shell, the shape of the energy director (s) may vary within the scope of the present invention.

Landscapes

  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
EP96490027A 1995-07-17 1996-06-27 Crayon dont la virole support de gomme est fixée par soudure ultra-sons et virole spécialement adaptée Expired - Lifetime EP0756946B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9508831A FR2736868B1 (fr) 1995-07-17 1995-07-17 Crayon dont la virole support de gomme est fixee par soudure ultra-sons et virole specialement adaptee
FR9508831 1995-07-17

Publications (2)

Publication Number Publication Date
EP0756946A1 EP0756946A1 (fr) 1997-02-05
EP0756946B1 true EP0756946B1 (fr) 1997-10-01

Family

ID=9481211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96490027A Expired - Lifetime EP0756946B1 (fr) 1995-07-17 1996-06-27 Crayon dont la virole support de gomme est fixée par soudure ultra-sons et virole spécialement adaptée

Country Status (15)

Country Link
US (1) US5774931A (es)
EP (1) EP0756946B1 (es)
JP (1) JP3398284B2 (es)
AR (1) AR002847A1 (es)
AT (1) ATE158760T1 (es)
BR (1) BR9603098A (es)
CA (1) CA2180778C (es)
DE (1) DE69600070T2 (es)
DK (1) DK0756946T3 (es)
EG (1) EG21474A (es)
ES (1) ES2112671T3 (es)
FR (1) FR2736868B1 (es)
GR (1) GR3025688T3 (es)
MA (1) MA23938A1 (es)
MX (1) MX9602816A (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2216186A3 (de) * 2009-01-29 2013-11-06 J.S. Staedtler GmbH & Co KG Schreib-, Zeichen- und/oder Markiergerät mit Zusatzfunktionselement sowie Verfahren zu dessen Herstellung

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6011084A (en) * 1998-06-26 2000-01-04 Binney & Smith Inc. Erasable colored pencil lead
US6565275B2 (en) 2001-04-27 2003-05-20 Binney & Smith Inc. Marker with eraser
US6505984B2 (en) * 2001-04-27 2003-01-14 Binney & Smith Inc. Crayon with eraser
US6547465B1 (en) 2002-01-22 2003-04-15 Shoot The Moon Products Ii, Llc Pencil with exposable eraser
US6932531B2 (en) 2003-04-28 2005-08-23 Sanford L.P. Writing assembly with eraser assembly
ITVI20120305A1 (it) 2012-11-12 2014-05-13 A Z Solutions S R L Dispositivo di scrittura multicomponente e metodo per la realizzazione di tale dispositivo
CN104181342B (zh) * 2014-09-01 2017-02-15 上海理工大学 方便测量的示波器探针接触固定配件

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1352677A (en) * 1919-12-01 1920-09-14 Jesse E Roach Eraser attachment for pencils
US1903474A (en) * 1926-06-19 1933-04-11 American Lead Pencil Co Eraser attachment for lead pencils
US2099613A (en) * 1935-05-25 1937-11-16 Julian S Loewus Eraser
US2493665A (en) * 1948-03-13 1950-01-03 Andrew P Gagnon Ferrule for holding erasers to the butt ends of pencils
US2785100A (en) * 1952-06-25 1957-03-12 Robert E Yaw Method of applying an advertising and eraser-retaining ferrule to a pencil shaft
DE1106207B (de) * 1958-05-06 1961-05-04 Mureo Furukawa Bleistift mit Radiergummi
US3262425A (en) * 1964-04-13 1966-07-26 Lawrence M Waugh Eraser tip
DE1958391A1 (de) * 1969-11-21 1971-05-27 Bleistiftmaschinenfabrik Fr Eh Verfahren und Einrichtung zum Verbinden eines Radiergummis mit einem Stift
CH576355A5 (es) * 1974-03-28 1976-06-15 Kern & Co Ag
FR2674179B1 (fr) * 1991-03-19 1994-11-10 Conte Procede de fabrication par tri-extrusion d'un crayon a ecrire ou a colorier et crayon a ecrire ou a colorier comportant une gaine intermediaire de protection de la mine.
US5244297A (en) * 1991-03-19 1993-09-14 Conte S.A. Process for manufacturing pencil by tri-extrusion and the produced pencil having an intermediate protective casing
JPH05305796A (ja) * 1992-03-02 1993-11-19 Sakura Color Prod Corp 塗布具及びその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2216186A3 (de) * 2009-01-29 2013-11-06 J.S. Staedtler GmbH & Co KG Schreib-, Zeichen- und/oder Markiergerät mit Zusatzfunktionselement sowie Verfahren zu dessen Herstellung

Also Published As

Publication number Publication date
US5774931A (en) 1998-07-07
AR002847A1 (es) 1998-04-29
JP3398284B2 (ja) 2003-04-21
FR2736868A1 (fr) 1997-01-24
ATE158760T1 (de) 1997-10-15
BR9603098A (pt) 1998-05-05
CA2180778C (en) 2002-09-17
ES2112671T3 (es) 1998-04-01
GR3025688T3 (en) 1998-03-31
JPH0930190A (ja) 1997-02-04
MA23938A1 (fr) 1997-04-01
MX9602816A (es) 1997-06-28
DE69600070D1 (de) 1997-11-06
EG21474A (fr) 2001-11-28
FR2736868B1 (fr) 1997-10-10
DK0756946T3 (da) 1998-04-27
DE69600070T2 (de) 1998-04-02
EP0756946A1 (fr) 1997-02-05
CA2180778A1 (en) 1997-01-18

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