FR1465634A

FR1465634A - Device for molding buttons or button caps from molded material

Info

Publication number: FR1465634A
Application number: FR40499A
Authority: FR
Original assignee: GOEPFER ETS
Current assignee: GOEPFER ETS
Priority date: 1965-12-01
Filing date: 1965-12-01
Publication date: 1967-01-13

Description

Dispositif pour le moulage de boutons ou de culots de boutons en matière moulée.Device for molding buttons or button caps from molded material.

La présente invention concerne le moulage des boutons en matière moulée ou des culots de boutons, dans le cas de boutons en deux pièces comprenant un culot en matière moulée et une coquille généralement métallique rapportée sur celui-ci. The present invention relates to the molding of the buttons in molded material or of the button caps, in the case of two-piece buttons comprising a base in molded material and a generally metallic shell attached thereto.

Pour être rentable, le moulage de ce genre d'artilles nécessite l'exécution d'un nombre important d'empreintes dans le moule même. Il convient donc de rechercher la plus grande simplicité possible dans le dispositif de moulage à mettre en oeuvre. To be profitable, the molding of this type of artillary requires the execution of a large number of impressions in the mold itself. The greatest possible simplicity should therefore be sought in the molding device to be implemented.

Le moulage de la partie apparente d'un bouton ou de la partie d'un culot destinée à recevoir la coquille du bouton ne présente en soi généralement pas de difficultés car, le plus souvent, cette partie ne comporte pas de surfaces en contre-dépouille. Le démoulage peut donc se faire par un déplacement des éléments du moule suivant l'axe du bouton perpendiculaire à la face apparente de ce dernier et ne pose pas de problème particulier. The molding of the visible part of a button or of the part of a base intended to receive the shell of the button does not in itself generally present any difficulties because, most often, this part does not have undercut surfaces. . Demoulding can therefore be done by moving the elements of the mold along the axis of the button perpendicular to the visible face of the latter and does not pose any particular problem.

Ce n'est habituellement pas le cas en ce qui concerne le moulage de la partie du bouton ou du culot de bouton appelée à recevoir les liens de fixation du bouton - c'est-à-dire la queue du bouton ou du culot - en raison de l'existence dans cette queue de l'orifice destiné au passage des liens de fixation, cet orifice étant en principe disposé transversalement par rapport à la direction du mouvement normal de démoulage. This is usually not the case with regard to the molding of the part of the button or the button base intended to receive the fastening links of the button - that is to say the tail of the button or the base - in because of the existence in this tail of the orifice intended for the passage of the fixing links, this orifice being in principle arranged transversely with respect to the direction of the normal demolding movement.

L'invention a pour objet un dispositif conçu pour permettre de mouler et de démouler dans des conditions remarquables de simplicité la queue de fixation d'un bouton ou d'un culot de bouton, avec son orifice de passage des liens de fixation. The subject of the invention is a device designed to make it possible to mold and unmold under remarkable conditions of simplicity the fixing shank of a button or of a button base, with its orifice for passing the fixing links.

A cet effet, ce dispositif est essentiellement caractérisé en ce que l'élément destiné à former la queue de fixation est constitué par une broche cylindrique ou conique de section circulaire qui se place dans un logement de forme correspondante ménagé dans le moule, parallèlement au sens d'ouverture de celui-ci, et dont l'extrémité vient prendre appui sur le fond de ce logement, cette bro che étant pourvue de deux rainures longitudinales diamétralement opposées et d'une rainure d'extrémité raccordées aux précédentes pour former les parties pleines de la queue délimitant l'orifice de passage des liens de fixation. To this end, this device is essentially characterized in that the element intended to form the fixing shank is constituted by a cylindrical or conical pin of circular section which is placed in a housing of corresponding shape formed in the mold, parallel to the direction opening thereof, and the end of which bears on the bottom of this housing, this pin being provided with two diametrically opposed longitudinal grooves and an end groove connected to the previous ones to form the solid parts of the tail delimiting the passage opening for the fixing links.

La broche précitée et son logement dans le moule ayant une forme de révolution sont facilement exécutables par tournage l'axe de tournage étant parallèle au sens d'ouverture du moule. The aforementioned spindle and its housing in the mold having a shape of revolution are easily executed by turning the turning axis being parallel to the direction of opening of the mold.

Les deux rainures longitudinales et la rainure d'extrémité ménagées dans la broche peuvent avantageusement être réalisées par fraisage au moyen de fraises cylindriques, de sorte que ces rainures présentent une section en arc de circonférence et que les parois de l'orifice de passage des liens de fixation, dont elles déterminent la formation lors du moulage, ont un profil arrondi correspondant, ce qui facilite le passage de l'aiguille de cousage et évite ensuite la rupture des liens de fixation par usure, grâce à l'absence d'angles vifs. The two longitudinal grooves and the end groove formed in the spindle can advantageously be produced by milling by means of cylindrical cutters, so that these grooves have an arcuate section of circumference and that the walls of the orifice for the passage of the links fasteners, whose formation they determine during molding, have a corresponding rounded profile, which facilitates the passage of the sewing needle and then avoids the breaking of the fastening links by wear, thanks to the absence of sharp angles .

On a représenté au dessin annexé, à titre d'exemple non limitatif, un mode de réalisation du dispositif selon l'invention appliqué au moulage d'un bouton ou d'un culot de bouton de forme simple. There is shown in the accompanying drawing, by way of non-limiting example, an embodiment of the device according to the invention applied to the molding of a button or of a button base of simple shape.

Dans le dessin
La figure 1 est une vue en coupe diamétrale d'un moule pourvu du dispositif selon l'invention;
La figure 2 est une coupe suivant II-II de la figure 1;
La figure 3 est une coupe transversale de la bro che suivant III-III de la figure 1;
La figure 4 représente en demi-coupe diamétrale et demi-élévation le bouton ou culot de bouton obtenu dans le moule des figures 1 à 3;
Les figures 5 et 6 sont respectivement des coupes suivant V-V et VI-VI de la figure 4.In the drawing
FIG. 1 is a view in diametral section of a mold provided with the device according to the invention;
Figure 2 is a section along II-II of Figure 1;
Figure 3 is a cross section of the pin along III-III of Figure 1;
FIG. 4 represents in diametral half-section and half-elevation the button or button base obtained in the mold of FIGS. 1 to 3;
Figures 5 and 6 are respectively cross sections along VV and VI-VI of Figure 4.

Dans l'exemple représenté, le dispositif selon l'invention est destiné au moulage d'un bouton ou culot de bouton comprenant, comme on le voit à la figure In the example shown, the device according to the invention is intended for molding a button or button base comprising, as can be seen in FIG.

Claims

4, a visible part 1 having the form of a simple pallet with a cylindrical lateral surface carrying in its center a fixing tail 2 provided with an orifice 2oe for the passage of the fastening links of the button. This shape was chosen for the simplicity of the drawing and it should be understood that the device according to the invention can be applied to shapes of buttons or more complex bases. The mold used (fig. 1 and 2) here comprises two parts 3 and 4 joining along a parting plane perpendicular to the axis of the button and which delimit a cavity 5 whose shape corresponds to that of part 1 of the button, the injection of the molding material being effected through an orifice 6 arranged in the parting line According to the invention, the element intended to form the fixing shank 2 of the button is constituted by a cylindrical pin 7 which s' fits with precision in a also cylindrical housing 8 formed in the mold, along the axis of the cavity 5 and therefore parallel to the opening direction 'of the mold. The spindle 7 is provided, on its part engaged in the cavity 5 and in the housing 8, with two diametrically opposed longitudinal grooves 9 having a section in the form of an arc of a circle and an end groove 10 of the same section, connecting with the grooves 9. Its upper end comes to rest closely against the bottom il of the housing 8. Under these conditions, intimate contact is established between the lateral cylindrical surface of the pin 7 and the lateral wall of the housing 8, with the exception of voids formed by the two grooves 9 and, likewise, intimate contact is established between the upper end of said pin and the bottom II of the housing, with the exception of the void formed by the groove 10. During injection, the material injected at 6> after having entered the cavity 5 of the mold, therefore enters the three grooves of the spindle 7 and, filling these grooves, forms the solid parts of the shank 2 of the button which delimits the orifice 2a intended for the passage links the fixing (see fig. 4 to 6) During demoulding, the spindle 7 comes out of its housing by axial displacement in the direction of the opening of the mold and in the direction of movement of the usual ejection devices (not shown). As stated above, due to the circular section of the grooves 9 and 10 of the spindle 7, the internal walls of the orifice 2a of the button fixing shank have an arcuate profile of corresponding circle, which offers the advantages already indicated. Other rounded or chamfered shapes could naturally be adopted for the same purposes, without departing from the scope of the ivention. ABSTRACT

1 Device for molding buttons or button caps comprising a fixing shank provided with an orifice for the passage of the button fastening links, essentially characterized in that the element intended to form the fastening shank is constituted by a cylindrical or conical spindle of circular section which is placed in a housing of corresponding shape provided in the mold, parallel to the opening direction thereof, and the end of which bears against the bottom of this housing, this spindle being provided with two diametrically opposed longitudinal grooves and an end groove connected to the previous ones to form the solid parts of the shank defining the orifice for passage of the fixing links;

2 "Device as defined under 10, in which the two longitudinal grooves and the end groove formed in the spindle have a section in the shape of an arc of a circle, advantageously produced by milling.