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Dokumentenidentifikation EP1033220 23.01.2003
EP-Veröffentlichungsnummer 1033220
Titel Matrixformstift mit eingebautem Abstandsstück
Anmelder DBM Reflex Enterprises INC., Laval, Quebec, CA
Erfinder Vecrin, Denis, Montreal, Quebec, H1T 2Y5, CA;
Iatan, George, Cote St.-Luc, Quebec, H4W 2X9, CA
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 60000945
Vertragsstaaten DE, ES, FR, GB, IT
Sprache des Dokument EN
EP-Anmeldetag 19.02.2000
EP-Aktenzeichen 001035724
EP-Offenlegungsdatum 06.09.2000
EP date of grant 11.12.2002
Veröffentlichungstag im Patentblatt 23.01.2003
IPC-Hauptklasse B29C 33/38
IPC-Nebenklasse B29C 33/30   B29L 11/00   

Beschreibung[en]
FIELD OF THE INVENTION

This invention relates to mold pins and in particular to optic or reflex pins having means thereon to space them from adjacent pins when a plurality of the pins are grouped in an pin master or mold matrix.

While the invention is applicable to either optic pins or reflex pins used in a mold matrix, a reflex pin or pins are used as examples only and the specification is not limited only to that form of pin.

BACKGROUND OF THE INVENTION

A pin master or matrix comprises a plurality of mold pins, for example reflex pins or a combination of optic pins and reflex pins, which are assembled into a specific configuration. The matrix (as it will be referred to hereinafter) is used to produce an electroform, by electrodeposition, or other suitable means, and the electroform so produced is then used to manufacture a mold which receives suitable mold material, such as thermoplastic, under pressure for making lens and/or reflective devices such as automobile lamp assemblies.

The outer lens portion of automotive lamp assemblies include sections made up of reflex elements, the purpose of which is to reflect light from an exterior light source directed at the lamp assembly. The reflex portion of a lamp assembly provides the reflective brilliance to a light source directed at the assembly i.e. from the headlights of a vehicle which are being directed at a rear lamp assembly incorporating the reflex elements. The brilliance of the reflective elements must meet standards set by various countries.

Lamp assemblies and their lenses for automotive vehicles are relatively simple to manufacture when the areas of the vehicles on which they are mounted are relatively flat. However, bodies of automotive vehicles are now smoothly contoured both on rear surfaces as well as front surfaces thereof in order to reduce the coefficient of drag and it has become more difficult to manufacture suitable lenses that will blend into these contours and which will still provide the required amount of reflectivity and brilliance required by law.

There is also a requirement for single, unitary lenses to meet the above mentioned needs for vehicles having smoother, rounded styling but which can also be tailored to the specific functions of the lamp assembly for a particular vehicle. For example, to meet safety requirements of certain countries, lamp assemblies must have lenses that extend into portions of the side surfaces of the vehicle as well as surfaces to the front and rear thereof. There are often compound curvatures to the surfaces to which the lenses must match.

One example of an automotive vehicle lens using reflex elements is shown in Canadian Patent 2,060,703 issued 17 October 1995 to DBM Reflex Enterprises Inc. This patent illustrates a lens which has a combination of optical elements and reflex elements.

Conventionally, reflex elements, sometimes in combination with optical elements, are manufactured by assembling a large plurality of mold pins (reflex and if necessary optical pins) into a matrix and an electroform is then made by electro-depositing metal on the shaped ends of the mold pins in the matrix and then using the resulting electroform in a mold where plastic material is injected to form the reflected surfaces.

It is important in the preparation of a matrix to have the pins oriented properly to provide the directional brilliance and reflectivity in the finished product and it is therefore necessary, in the manufacturer of a reflective matrix, to ensure that the required reflectivity in the finished product is not lost in the curved portion thereof while matching the contour of a vehicle body.

There are several examples of arranging reflex pins in a bundle or matrix so that they provide the reflective brilliance in the resulting lenses, taking into account the above mentioned body contours of vehicles to which the lenses are attached.

One example of an attempt to meeting the requirements is shown in U.S. Patent 4,733,946 of March 29, 1988 to Cossetti. In this publication, reflex pins are machined such that their side surfaces are tapered towards the face of the matrix so that when the elements are grouped in a matrix, the tapered pins will provide the necessary curvature. However, while this may be effective, it is a very time consuming and very expensive manner in dealing with the problem.

In U.S. Patent 5,565,221 of October 15, 1996 assigned to DBM Reflex Enterprises Inc., the problem referred to above is addressed by providing spacers or wedges for use in combination with mold elements such as optic or reflex pins, in the pin master or matrix assembly. The spacers or wedges are selectively located between rows or banks of mold elements in the matrix to provide the required orientation to the optic and/or reflex pins. Thus the necessary reflective surfaces from the prisms will return the requirement amount of reflected light toward a source even when the surface of the product is on a contoured portion of a lamp assembly on a vehicle. The spacer consists of an elongated body having flat parallel side edges and converging faces which taper towards one another from a major edge to a minor edge. One of the faces has a surface profile to fit the profile of juxtaposed elements in the matrix assembly. These spacers or wedges do function well' but problems have been encountered in bundling them in the matrix and maintaining the bundles with the elements in proper orientation.

Another example of the prior art is shown in the patent to Hedgewick U.S. 3,258,840 of 5 July 1966.

SUMMARY OF THE INVENTION

The present invention addresses the problems referred to above by providing spacing means for use in combination with mold elements such as optic or reflex reflector pins, in the pin block or matrix assembly. The spacing means can be selectively located in producing a continuously variable pin axis electroform so as to alter the longitudinal axis of the pins relative to that of adjacent pins whereby the longitudinal axis of the pins are tapered with respect to one another towards the reflex ends of the pins.

In accordance with a first aspect, the invention relates to a mold pin for use in a mold matrix as disclosed in claim 1.

According to a still further aspect, the invention relates to a method of providing a mold pin with means for varying the longitudinal axis thereof as disclosed in claim 11.

According to a further aspect, the invention relates to a method of altering the angle of the longitudinal axis of a mold pin as disclosed in claim 14.

DESCRIPTION OF THE DRAWINGS

The invention is illustrated by way of example in the accompanying drawings in which:

  • FIGURE 1 is a schematic plan view of part of an electroform showing mold pins with their longitudinal angles set for a desired curvature in a matrix assembly;
  • FIGURE 2 is an elevation view of a reflex pin having tapering means thereon according to one embodiment of the present invention;
  • FIGURE 3 is an end view of the mold pin shown in Figure 2;
  • FIGURE 4 is an elevation view of a plurality of pins having tapering means thereon according to one embodiment of the invention and arranged in a group simulating a portion of a matrix assembly;
  • FIGURE 5 is an elevation view of a mold pin according to a further embodiment of the invention;
  • FIGURE 6 is an elevation view similar to Figure 5 showing tapering means applied thereto;
  • FIGURE 7 is an end view of the pin shown in Figure 6;
  • FIGURE 8 is a plan view of a matrix assembly of a plurality of pins clamped together for making an electroform; and
  • FIGURE 9 is a sectional view taken along the line 9-9 of Figure 8.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to Figure 1, a matrix 10 includes a plurality of mold pins such as reflex pins 12 bundled together for the application of electroform material 14 over the heads 16 of the pins as illustrated. Selected ones of the pins 12 have their longitudinal axis varied relative to adjacent pins in the matrix so that those longitudinal axes are tapered with respect to one another towards the operative or reflex end 16 of the pins.

Figures 2 and 3 show one example of spacing means according to the invention. Pin 12 is provided with a dowel 18 in the sidewall thereof. A location on the sidewall of the pin is selected and a socket 20 is drilled in the sidewall 22 normal to the longitudinal axis of the pin. The dowel is then inserted in the socket 20 so that the dowel 18 extends normal to the longitudinal axis of the pin. The length of protrusion of the dowel sets the degree of taper of the pin relative to adjacent pins in the matrix. The length of protrusion can be adjusted in various ways such as by grinding or the like.

Figure 4 illustrates an example of a plurality of pins 12, 13 and 15 having dowels 18 projecting therefrom and serving to space the upper ends of the pins from one another to the extent of a desired angle.

A further embodiment of the invention is illustrated in Figures 5, 6 and 7. A reflex pin has a portion of its upper end formed, for example by machining, to provide a reduced portion 26 leaving a head 28. Pin 24 is then placed in a mold 30 having a sidewall 32 tapered to a degree which, if extended, as illustrated by the dashed line 34, would meet the side of the pin adjacent the junction 36 with the head 38 of the pin. A collar 40 is then molded on to the upper end of the pin around the reduced portion as shown in Figure 6 and, when cooled and removed from the mold, provides the collar 40 which constitutes the means for spacing that pin from adjacent ones in a matrix.

The central longitudinal axis of the collar 40 is offset from and is tapered with respect to the central longitudinal axis of the pin 24. It will be noted that the configuration of the offset collar 40 corresponds to that of the pin 24 from which it is offset.

It will be appreciated that the length of the collar and the width thereof (the amount offset from the pin) can be selected to meet the requirements of the spacing between the adjacent pins in the matrix.

Figures 8 and 9 show a pin bundle 42 in a matrix consisting of a combination of a first group of pins 44 having their longitudinal axis parallel to one another and a second group of pins 46 having spacing means in the form of a collar 40 on each of the pins so that the longitudinal axis of the pins in group 46 have been altered with respect to adjacent pins in that group. As shown in Figure 8, this has the result of orienting the longitudinal axis of the pins in group 46 so that the operative or reflex ends 38 of the pins are directed as desired.

The material for the spacing collar 40 should be a suitable high impact material such as polycarbonate, one that is resistant to acids and solvents and that adheres well to the pins.

While the invention has been described in connection with a specific embodiment thereof and in a specific use, various modifications thereof will occur to those skilled in the art without departing from the scope of the invention as set forth in the appended claims.

The terms and expressions which have been employed in this specification are used as terms of description and not of limitations, and there is no intention in the use of such terms and expressions to exclude any equivalents of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the claims.


Anspruch[de]
  1. Gußstift (12, 24) zur Verwendung in einer Gußmatrize (10, 42), dadurch gekennzeichnet, daß an dem Stift (12, 24) Einrichtungen (18, 40) vorhanden sind, um den Winkel der Längsachse des Stiftes (12, 24) in bezug auf die Längsachsen angrenzender Stifte in der Matrize effektiv zu ändern, wodurch die Längsachsen der Stifte zu ihren wirksamen Enden (16, 38) hin in bezug aufeinander spitz zulaufen.
  2. Gußstift nach Anspruch 1, dadurch gekennzeichnet, daß die Längsachsen-Änderungseinrichtung einen Paßstift (18) umfaßt, der sich in einer Seitenwand des Gußstifts (12) befindet und senkrecht zu ihm verläuft, wobei sich der Ort des Paßstifts zu dem von seinem wirksamen Ende (16) fernen Ende des Stiftes (12) hin befindet.
  3. Gußstift nach Anspruch 1, dadurch gekennzeichnet, daß die Längsachsen-Änderungseinrichtung ein Abstandselement (40) umfaßt, das an dem Stift (24) an einem von seinem wirksamen Ende (38) fernen Ort angebracht ist und gegenüber dem Stift (24) versetzt ist, um den fernen Ort des Stiftes (24) von den angrenzenden Stiften in der Matrize (10) zu beabstanden.
  4. Gußstift nach Anspruch 3, dadurch gekennzeichnet, daß die Längsachsen-Änderungseinrichtung ein Ringelement (40) umfaßt, das an dem Stift (24) angegossen und ihm gegenüber versetzt ist und sich fern von seinem wirksamen Ende (38) befindet.
  5. Gußstift nach irgendeinem der Ansprüche 1-4, bei dem der Gußstift (12, 24) ein Reflexstift ist.
  6. Gußstift nach Anspruch 3, dadurch gekennzeichnet, daß das Abstandselement einen Ring (40) umfaßt, der an den Stift (24) angegossen ist, wobei die Längsachse (34) des Ringes (40) gegenüber der Längsachse des Stiftes (24) versetzt ist und gegenüber dieser spitz zuläuft.
  7. Gußstift nach irgendeinem der vorangehenden Ansprüche 3-6, dadurch gekennzeichnet, daß die Achsenänderungseinrichtung, die den Ring (40) enthält, am Schaft des Stiftes (24) angrenzend an dessen von dem wirksamen Ende (38) fernen Ende positioniert ist, wobei der Ring (40) gegenüber der mittigen Längsachse des Stiftes versetzt ist.
  8. Gußstift nach Anspruch 7, dadurch gekennzeichnet, daß der Schaft des Stiftes (24) einen Abschnitt (26) mit verringertem Durchmesser besitzt, in dem der Ring (40) verankert ist.
  9. Gußstift nach irgendeinem der vorangehenden Ansprüche 3-8, bei dem der Gußstift (12, 24) ein Reflexstift ist und die Gußmatrize (10, 24) zur Verwendung bei der Herstellung einer Galvanoform mit veränderlicher Stiftachse dient.
  10. Gußstift nach irgendeinem der vorangehenden Ansprüche 4-8, bei dem die Konfiguration des Ringes (40) der des Stiftes (24) entspricht, gegenüber dem er versetzt ist.
  11. Verfahren zur Schaffung eines Gußstiftes mit einer Einrichtung zum Ändern der Längsachse des Stiftes in bezug auf angrenzende Stifte in einer Gußmatrize; wobei das Verfahren durch folgende Schritte gekennzeichnet ist:
    • a) Auswählen eines Ortes an einer Seitenwand des Gußstifts (12);
    • b) Bohren eines Lagers (20) in der Seitenwand senkrecht zur Längsachse des Stiftes (12); und
    • c) Einführen eines Paßstifts (18) in das Lager (20) und Befestigen darin, wobei der Paßstift senkrecht zur Längsachse des Stiftes (12) verläuft, wobei die Länge des Vorsprungs des Paßstifts den Grad einstellt, in dem der Stift in bezug auf einen angrenzenden Stift (12) in der Matrize (10) spitz zuläuft.
  12. Verfahren nach Anspruch 11, das den Schritt der maschinellen Bearbeitung des äußeren Endes des Paßstifts (18) enthält, um die gewünschte Länge des Paßstifts außerhalb des Stiftes (12) zu erzeugen.
  13. Verfahren nach Anspruch 11 oder nach Anspruch 12, bei dem der Gußstift (12) ein Reflexstift ist.
  14. Verfahren zum Ändern des Winkels der Längsachse eine Gußstifts (24) in bezug auf angrenzende Stifte bei Verwendung in einer Gußmatrize (10, 42), dadurch gekennzeichnet, daß der Schaft des Stiftes (24) mit einem Abschnitt (26) mit verringertem Durchmesser versehen wird, wobei der Abschnitt (26) an das von seinem wirksamen Ende (38) des Stiftes ferne Ende des Stiftes angrenzt; und daß an dem Stiftschaft in dem Abschnitt (26) mit verringertem Durchmesser ein Ring (40) positioniert und verankert wird, wobei die Längsachse des Ringes (40) in bezug auf die Längsachse des Stiftes (24) versetzt ist und spitz zuläuft.
Anspruch[en]
  1. A mold pin (12,24) for use in a mold matrix (10,42), characterized in that said pin (12,24) having means (18,40) thereon to effectively alter the angle of the longitudinal axis of said pin (12,24) relative to that of adjacent pins in said matrix whereby said longitudinal axis of said pins are tapered with respect to one another towards the operative ends (16,38) thereof.
  2. A mold pin according to claim 1 characterized in that said longitudinal axis altering means comprises a dowel (18) located in a sidewall of said mold pin (12) and extending normal thereto, said dowel location being toward the end of the pin (12) remote from the operative end (16) thereof.
  3. A mold pin according to claim 1 characterized in that said longitudinal axis altering means comprising a spacing member (40) mounted on, and offset from, said pin (24) at a location remote from the operative end (38) thereof to space said remote location of said pin (24) from adjacent pins in said matrix (10).
  4. A mold pin according to claim 3 characterized in that said longitudinal axis altering means comprises a collar member (40) molded onto, and offset from, said pin (24) and located remote from the operative end (38) thereof.
  5. A mold pin according to any one of claims 1-4 wherein said mold pin (12,24) is a reflex pin.
  6. A mold pin according to claim 3 characterized in that said spacing member comprises a collar (40) molded onto said pin (24) and said collar (40) having its longitudinal axis (34) offset from and tapered with respect to the longitudinal axis of the pin (24).
  7. A mold pin according to any one of the preceding claims 3-6 characterized in that said axis altering means comprising said collar (40) is positioned on the shank of said pin (24) adjacent the end thereof remote from the operative end (38) and said collar (40) being offset from the central longitudinal axis of said pin.
  8. A mold pin according to claim 7 characterized in that the shank of said pin (24) has a portion (26) of reduced diameter and said collar (40) is anchored therein.
  9. A mold pin according to any one of the preceding claims 3-8 wherein said mold pin (12,24) is a reflex pin and said mold matrix (10,46) is for use in the manufacture of a variable pin axis electroform.
  10. A mold pin according to any one of the preceding claims 4-8 wherein the configuration of said collar (40) corresponds to that of the pin (24) from which it is offset.
  11. A method of providing a mold pin with means for varying the longitudinal axis of said pin relative to adjacent pins in a mold matrix; said method characterized by the steps of:
    • a) selecting a location on a sidewall of said mold pin (12) ;
    • b) drilling a socket (20) in said sidewall normal to the longitudinal axis of said pin (12); and
    • c) inserting and securing a dowel (18) in said socket (20) whereby said dowel extends normal to the longitudinal axis of said pin (12) whereby the length of protrusion of said dowel sets the degree of taper of said pin relative to an adjacent pin (12) in said matrix (10).
  12. The method according to claim 11 including the step of machining the outer end of said dowel (18) to provide the desired length of the dowel outwardly of said pins (12).
  13. The method according to claim 11 or claim 12 wherein the mold pin (12) is a reflex pin.
  14. A method of altering the angle of the longitudinal axis of a mold pin (24) relative to adjacent pins when used in a mold matrix (10,42), characterized by providing the shank of said pin (24) with a section (26) of reduced diameter, said section (26) being adjacent the pin end remote from its operative end (38); and positioning and anchoring a collar (40) on said pin shank in said reduced diameter section (26), the longitudinal axis of said collar (40) being offset and tapered with respect to the longitudinal axis of the pin (24).
Anspruch[fr]
  1. Broche de coulée (12, 24) pour être utilisée dans une matrice de coulée (10, 42), caractérisée par le fait, qu'il existe des dispositifs (12, 24) à la broche (18, 40), afin de modifier de manière efficace l'angle de l'axe longitudinal de la broche (12, 24) par rapport aux broches adjacentes aux axes longitudinaux dans la matrice, de telle sorte que les axes longitudinaux des broches se rapprochent de manière affinée vers leurs bouts actifs (16, 38).
  2. Conformément à la 1ière revendication, la broche de coulée est caractérisée par le fait que le dispositif de modification de l'axe longitudinal de la broche est formé d'un goujon (18) qui se trouve dans une paroi latérale de la broche de coulée (12) et qui se dirige verticalement vers celui-ci, de manière à ce que la position du goujon se dirige du bout actif (16) vers l'autre extrémité du bout (12).
  3. Conformément à la 1ière revendication, la broche de coulée est caractérisée par le fait que le dispositif de modification des axes longitudinaux comprend un élément d'écartement (40), placé à la broche (24) à un emplacement éloigné du bout actif (38) et qui est décalé par rapport à la broche (24), afin d'assurer l'écartement de l'extrémité éloignée de la broche (24) des broches adjacentes dans la matrice (10).
  4. Conformément à la 3ième revendication, la broche de coulée est caractérisée par le fait que le dispositif de modification de l'axe longitudinal comprend un élément annulaire (40) coulé à la broche (24) et est décalé par rapport à celui-ci et se trouve loin de son bout actif (38).
  5. Broche de coulée conformément à une revendication quelconques de 1-4, où la broche de coulée (12, 24) est une broche à réflexion.
  6. Conformément à la 3ième revendication, la broche de coulée est caractérisée par le fait que l'élément d'écartement est formé d'un anneau (40), coulé à la broche (24), de telle sorte que l'axe longitudinal (34) de l'anneau (40) est décalé par rapport à l'axe longitudinal de la broche (24) qui contrairement à celui-ci a une pointe effilée.
  7. Conformément à une des revendications précédentes quelconques 3-6, la broche de coulée est caractérisée par le fait que le dispositif de modification de l'axe qui renferme l'anneau (40) est positionné à la tige de la broche (24), adjacente à l'extrémité éloignée du bout actif (38), de sorte que l'anneau (40) soit décalé par rapport à l'axe longitudinal central de la broche.
  8. Conformément à la 7ième revendication, la broche de coulée est caractérisée par le fait que la tige de la broche (24) possède une section (26) avec un diamètre réduit dans laquelle l'anneau (40) est ancré.
  9. Conformément à une des revendications précédentes quelconques 3-8, la broche de coulée (12, 24) est une broche à réflexion et la matrice de coulée (10, 24) sert à la fabrication d'une pièce électroformée à axe de broche variable.
  10. Conformément à une des revendications précédentes quelconques 4-8, la broche de coulée, dont la configuration de l'anneau (40) correspond à celle de la broche (24), est décalée par rapport à celui-ci.
  11. Procédé pour réaliser une broche de coulée par le biais d'un dispositif pour modifier l'axe longitudinal de la broche par rapport aux broches adjacentes dans une matrice de coulée, de sorte que le procédé soit caractérisé par les étapes suivantes :
    • a) Sélection d'un emplacement à une paroi latérale de la broche de coulée (12);
    • b) Alésage d'un palier (20) sur la paroi latérale verticalement par rapport à l'axe longitudinal de la broche (12); et
    • c) Introduction d'un goujon (18) dans le palier (20) et fixation à l'intérieur de celui-ci, de manière à ce que le goujon soit disposé verticalement par rapport à l'axe longitudinal de la broche (12), de telle sorte que la longueur de la partie en saillie du goujon détermine le degré d'effilement de la broche par rapport à une broche adjacente (12) dans la matrice (10).
  12. Procédé conformément à la revendication 11, renfermant l'opération de l'exécution par la machine de l'extrémité éloignée du goujon (18) pour obtenir la longueur désirée du goujon à l'extérieur de la broche (12).
  13. Procédé conformément à la revendication 11 ou conformément à la revendication 12, dans laquelle la broche de coulée (12) est une broche à réflexion.
  14. Procédé pour la modification de l'angle de l'axe longitudinal d'une broche de coulée (24) par rapport aux broches adjacentes en utilisant une matrice de coulée (10, 42), caractérisée par le fait que la tige de la broche (24) est pourvue d'une section (26) à diamètre réduit, alors que la section (26) est confinée à l'extrémité la plus éloignée de la broche à son bout actif (38); et qu'un anneau (40) à diamètre réduit est positionné et ancré à la tige de la broche dans la section (26), de sorte que l'axe longitudinal de l'anneau (40) est décalé par rapport à l'axe longitudinal de la broche (24) et a une pointe effilée.






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