EP0030893B1 - Applicator of molten materials such as thermoplastic glues - Google Patents

Applicator of molten materials such as thermoplastic glues Download PDF

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Publication number
EP0030893B1
EP0030893B1 EP80401774A EP80401774A EP0030893B1 EP 0030893 B1 EP0030893 B1 EP 0030893B1 EP 80401774 A EP80401774 A EP 80401774A EP 80401774 A EP80401774 A EP 80401774A EP 0030893 B1 EP0030893 B1 EP 0030893B1
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EP
European Patent Office
Prior art keywords
rod
gripping device
applicator
applicator according
stick
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
Application number
EP80401774A
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German (de)
French (fr)
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EP0030893A1 (en
Inventor
René Barlogis
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.)
FRANCAISE D' AGRAFAGE INDUSTRIEL SOFRAGRAF Ste
Original Assignee
FRANCAISE D' AGRAFAGE INDUSTRIEL SOFRAGRAF Ste
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Application filed by FRANCAISE D' AGRAFAGE INDUSTRIEL SOFRAGRAF Ste filed Critical FRANCAISE D' AGRAFAGE INDUSTRIEL SOFRAGRAF Ste
Publication of EP0030893A1 publication Critical patent/EP0030893A1/en
Application granted granted Critical
Publication of EP0030893B1 publication Critical patent/EP0030893B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00523—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material
    • B05C17/0054—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the driving means for the material being pneumatic or hydraulic
    • B05C17/00543—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the driving means for the material being pneumatic or hydraulic comprising a piston
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00523—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material
    • B05C17/00526—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the material being supplied to the apparatus in a solid state, e.g. rod, and melted before application
    • B05C17/0053—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the material being supplied to the apparatus in a solid state, e.g. rod, and melted before application the driving means for the material being manual, mechanical or electrical
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17119—Feed type

Definitions

  • the present invention relates to devices, generally made in the form of guns and which are used to dispense, in small quantities, molten materials such as thermoplastics, for example glues, waxes, etc.
  • These devices which are commonly called “applicators”, include a heating chamber provided at one end with a dispensing nozzle and, at the other, with an inlet pipe in which a stick of material is engaged. to distribute.
  • this stick When this stick is inserted into the chamber, either by hand or by means of a suitable device, for example pneumatic or mechanical, it gradually melts, also acting as a piston to expel the molten material. through the dispensing nozzle.
  • a suitable device for example pneumatic or mechanical
  • the latter is generally fitted with a check valve.
  • the stick If the stick is not given the possibility of moving back a few millimeters in order to compensate for the expansion of the material, the latter, pressurized in the heating chamber, forces the check valve and leaves the nozzle in the form of a leak, what to avoid.
  • the main objective of the present invention is to remedy the drawbacks which have just been explained.
  • US-A-3774817 describes a molten material applicator, having a frame equipped with a heating chamber, itself provided with a dispensing nozzle and comprising an inlet pipe in which a stick of material can be engaged. to be dispensed so that it gradually penetrates into the heating chamber by pushing the molten material out of the nozzle, the inlet tubing being equipped with a clamping device, arranged so as to grip the stick.
  • the clamping device is moved back and forth by a suitable motor device, and it is arranged so as to push the stick little by little inside the chamber. heats up, each motor stroke being triggered by an appropriate trigger; any backward movement of the stick has its amplitude which is further limited by the engagement of the end of a leaf spring in the side wall of the stick; it should be noted that this leaf spring is not tensioned by the advance movement of the rod.
  • This prior patent therefore does not describe means making it possible to effectively prevent the pressurization of the heating chamber and the leakage of molten material out of the nozzle.
  • the molten material applicator according to the present invention also has a frame equipped with a heating chamber provided with a dispensing nozzle and comprising an inlet tube into which a stick of material to be dispensed can be engaged to make it penetrate. little by little in the heating chamber by pushing the molten material out of the nozzle, said inlet nozzle being equipped with a clamping device arranged so as to grip the stick; it is characterized in that the clamping device is arranged so as to be driven by the stick, against an elastic restoring force, when the stick advances, then to bring said stick back under the effect of the restoring force, when no push is no longer exerted on this rod.
  • the clamping device which is provided with the molten material applicator according to the present invention is recalled back when no thrust is exerted on the stick, over a distance which can reach several millimeters and which is sufficient to compensate for the expansion of the molten material and, even create a slight depression in the heating chamber, guaranteeing the tightness of the closure of the nozzle.
  • a pistol-shaped applicator comprises a frame 1 in the barrel of which is mounted a heating chamber 2, supplied with electric current by means of conductors which are did not represent so as not complicate the drawing and which are connected to a cord 3 emerging from the butt 4 of the frame.
  • the heating chamber ends, in a usual manner, by a dispensing nozzle 5 provided with a non-illustrated check valve and, at the rear, it is extended by a manifold.
  • inlet 6 which ends with a sleeve 7 made of a material which is poorly conductive of heat, for example a polytetrafluoroethylene (Teflon - registered trade mark). It is into this sleeve that the rods 8 of product to be dispensed are introduced, for example thermoplastic glue.
  • the sleeve 7 is provided with a collar 9 by which it abuts on a partition 10 of the frame, which it passes through without appreciable play.
  • the frame comprises a chamber 11 limited by a wall 12 that the rear end of the sleeve 7 passes through an orifice 13 in which said sleeve passes with clearance.
  • a pinching device 14 On the rear end of the sleeve 7 is threaded a pinching device 14. This device has a central portion which passes with little clearance in the orifice 13 and is provided with a flange 15 abutting on the internal face of the wall 12.
  • Said central portion is extended, in the chamber 11, by divergent fins 16, for example two in number and diametrically opposite.
  • divergent fins 16 for example two in number and diametrically opposite.
  • the central portion of the device 14 is extended by arms 17, for example also two in number, but offset by 90 ° with respect to the fins 16.
  • These arms 17 end in jaws 18 whose edges 19 are curved, as shown in FIG. 2, and located at rest on a circumference of diameter smaller than that of the rods 8.
  • edges 19 are bevelled so as to facilitate the introduction of the rods between the jaws but to cling to said rods when they tend to move back.
  • the pinching device 14 is preferably made of rigid and elastic synthetic material, for example polyamide.
  • This movement is however accompanied by a forward drive of the clamping device 14 whose jaws 18 grip the stick, drive which allows the elasticity of the fins 16.
  • the stick can however slide on the jaws 18 to sink in the heating chamber as the molten material is expelled through the nozzle 5.
  • the elastic fins 16 straighten up and make the device 14 move back with the stick, in the opposite direction to the arrow F, by a few millimeters.
  • This retraction of the stick compensates for the expansions and causes, in the heating chamber, a suction effect which prevents any untimely exit of molten material by the nozzle 5.
  • the stick is kept in the correct position at the inlet of the sleeve 7.
  • FIGS. 4 and 5 works in the same way as the embodiment which has just been described.
  • the clamping device 14 is this time produced in three parts, namely two half-shells 20 and a spring 21.
  • the half-shells 20 each have an arm 17 terminated by a jaw 18 with a bevelled edge 19, like the corresponding elements of the embodiment described above.
  • Their base 22 is pressed against the wall 12, in the chamber 11, under the effect of the spring 21, in order to ensure the tightening.
  • the spring 21 also abuts on the partition 10 and surrounds the sleeve 7.
  • a centering surface 23 is provided for the spring 21 at the rear of each of the half-shells 20.
  • the latter can be made of metal, by example a light alloy.
  • the elastic clamping device 14 can be adapted to applicators in which the sticks 8 are moved by an appropriate device and no longer by direct pushing by the user as in the examples previous.
  • the device 14 here in a single piece like that of FIGS. 1 to 3, is mounted, between the walls 10 and 12, in the chamber 11 of the frame, on the outlet pipe 6 of the heating chamber 2.
  • the arms 17 and the jaws 18 penetrate into the cylinder 25 of the pneumatic device which serves to advance the sticks 8.
  • This pneumatic device which is actuated using a push button 26, comprises, in the usual manner, an annular piston 27 which slides in the cylinder 25 and in which the stick 8 is engaged and gripped by so as to be pushed forward.
  • an opposing spring 33 centered by a boss 34 of the piston and which rests on the front wall 35 of the cylinder.
  • the device 14 returns to its normal place, making the rod move back, when the piston makes its return stroke under the effect of the spring 33.
  • This device comprises a toothed cam 37 which a linkage not shown makes it possible to move when acting on a trigger 38 mounted in the butt 4 of the gun.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)

Description

La présente invention se rapporte à des appareils, généralement réalisés sous forme de pistolets et que l'on utilise pour distribuer, par petites quantités, des matières en fusion telles que des matières thermoplastiques, par exemple des colles, des cires, etc...The present invention relates to devices, generally made in the form of guns and which are used to dispense, in small quantities, molten materials such as thermoplastics, for example glues, waxes, etc.

Ces appareils, que l'on appelle couramment «applicateurs», comportent une chambre de chauffe munie à une extrémité d'une buse de distribution et, à l'autre, d'une tubulure d'entrée dans laquelle on engage un bâtonnet de matière à distribuer.These devices, which are commonly called “applicators”, include a heating chamber provided at one end with a dispensing nozzle and, at the other, with an inlet pipe in which a stick of material is engaged. to distribute.

Lorsqu'on enfonce ce bâtonnet dans la chambre, soit à la main, soit par l'intermédiaire d'un dispositif convenable, par exemple pneumatique ou mécanique, il fond peu à peu en faisant en outre office de piston pour expulser la matière en fusion par la buse de distribution. Cette dernière est généralement munie d'un clapet de retenue.When this stick is inserted into the chamber, either by hand or by means of a suitable device, for example pneumatic or mechanical, it gradually melts, also acting as a piston to expel the molten material. through the dispensing nozzle. The latter is generally fitted with a check valve.

Dans la plupart des appareils connus du genre précité, l'introduction du bâtonnet dans la tubulure d'entrée de la chambre de chauffe présente des difficultés car ce bâtonnet n'est pas maintenu positivement à l'entrée de la tubulure qu'obstrue encore l'extrémité du bâtonnet précédent. En outre, la dilatation de la matière en fusion à l'intérieur de la chambre de chauffe a tendance à refouler le bâtonnet vers l'arrière, ce qui peut le faire sortir de la tubulure et provoquer, hors de celle-ci, un écoulement de matière fondue qui risque souvent de rendre l'applicateur inutilisable.In most known devices of the aforementioned kind, the introduction of the stick into the inlet pipe of the heating chamber presents difficulties because this stick is not positively held at the entry of the pipe which is still obstructed by the end of the previous stick. In addition, the expansion of the molten material inside the heating chamber tends to push the stick back, which can cause it to come out of the tubing and cause, out of the latter, a flow molten material which can often render the applicator unusable.

Si on ne laisse pas au bâtonnet la possibilité de reculer de quelques millimètres afin de compenser la dilatation de la matière, cette dernière, mise en pression dans la chambre de chauffe, force le clapet de retenue et sort de la buse sous forme de fuite, ce qu'il faut éviter.If the stick is not given the possibility of moving back a few millimeters in order to compensate for the expansion of the material, the latter, pressurized in the heating chamber, forces the check valve and leaves the nozzle in the form of a leak, what to avoid.

La présente invention a pour principal objectif de remédier aux inconvénients que l'on vient d'exposer.The main objective of the present invention is to remedy the drawbacks which have just been explained.

Le US-A-3774817 décrit un applicateur de matière fondue, présentant un bâti équipé d'une chambre de chauffe, elle-même munie d'une buse de distribution et comportant une tubulure d'entrée dans laquelle on peut engager un bâtonnet de matière à distribuer pour le faire pénétrer peu à peu dans la chambre de chauffe en refoulant la matière fondue hors de la buse, la tubulure d'entrée étant équipée d'un dispositif de pinçage, agencé de façon à saisir le bâtonnet.US-A-3774817 describes a molten material applicator, having a frame equipped with a heating chamber, itself provided with a dispensing nozzle and comprising an inlet pipe in which a stick of material can be engaged. to be dispensed so that it gradually penetrates into the heating chamber by pushing the molten material out of the nozzle, the inlet tubing being equipped with a clamping device, arranged so as to grip the stick.

Dans cet applicateur connu, cependant, le dispositif de pinçage est animé d'un mouvement de va-et-vient par un dispositif moteur approprié, et il est agencé de manière à pousser le bâtonnet peu à peu à l'intérieur de la chambre de chauffe, chaque course motrice étant déclenchée par une gâchette appropriée ; tout mouvement de recul du bâtonnet a son amplitude qui est d'autre part limitée par l'engagement de l'extrémité d'une lame de ressort dans la paroi latérale du bâtonnet ; il convient de remarquer que cette lame de ressort n'est pas mise sous tension par le mouvement d'avance du bâtonnet. Ce brevet antérieur ne décrit donc pas des moyens permettant d'éviter efficacement la mise en pression de la chambre de chauffe et les fuites de matière fondue hors de la buse.In this known applicator, however, the clamping device is moved back and forth by a suitable motor device, and it is arranged so as to push the stick little by little inside the chamber. heats up, each motor stroke being triggered by an appropriate trigger; any backward movement of the stick has its amplitude which is further limited by the engagement of the end of a leaf spring in the side wall of the stick; it should be noted that this leaf spring is not tensioned by the advance movement of the rod. This prior patent therefore does not describe means making it possible to effectively prevent the pressurization of the heating chamber and the leakage of molten material out of the nozzle.

L'applicateur de matière fondue selon la présente invention présente également un bâti équipé d'une chambre de chauffe munie d'une buse de distribution et comportant une tubulure d'entrée dans laquelle on peut engager un bâtonnet de matière à distribuer pour le faire pénétrer peu à peu dans la chambre de chauffe en refoulant la matière fondue hors de la buse, ladite tubulure d'entrée étant équipée d'un dispositif de pinçage agencé de façon à saisir le bâtonnet ; il est caractérisé en ce que le dispositif de pinçage est agencé de façon à être entraîné par le bâtonnet, à l'encontre d'une force de rappel élastique, lorsque le bâtonnet avance, puis à ramener ledit bâtonnet en arrière sous l'effet de la force de rappel, lorsqu'aucune poussée n'est plus exercée sur ce bâtonnet.The molten material applicator according to the present invention also has a frame equipped with a heating chamber provided with a dispensing nozzle and comprising an inlet tube into which a stick of material to be dispensed can be engaged to make it penetrate. little by little in the heating chamber by pushing the molten material out of the nozzle, said inlet nozzle being equipped with a clamping device arranged so as to grip the stick; it is characterized in that the clamping device is arranged so as to be driven by the stick, against an elastic restoring force, when the stick advances, then to bring said stick back under the effect of the restoring force, when no push is no longer exerted on this rod.

Grâce à cette disposition, le dispositif de pinçage dont est pourvu l'applicateur de matière fondue selon la présente invention est rappelé en arrière lorsqu'aucune poussée ne s'exerce plus sur le bâtonnet, sur une distance qui peut attein- dre plusieurs millimètres et qui est suffisante pour compenser la dilatation de la matière en fusion et, même créer une légère dépression dans la chambre de chauffe, garantissant l'étanchéité de la fermeture de la buse.Thanks to this arrangement, the clamping device which is provided with the molten material applicator according to the present invention is recalled back when no thrust is exerted on the stick, over a distance which can reach several millimeters and which is sufficient to compensate for the expansion of the molten material and, even create a slight depression in the heating chamber, guaranteeing the tightness of the closure of the nozzle.

La description qui va suivre, en regard du dessin annexé donné à titre d'exemple non limitatif, fera bien comprendre comment l'invention est réalisée, les particularités qui ressortent, tant du dessin que du texte, faisant, bien entendu, partie de ladite invention.

  • La figure 1 est une vue schématique en coupe longitudinale d'un premier mode de réalisation d'applicateur, perfectionné selon l'invention.
  • La figure 2 est une vue en bout du dispositif de pinçage de ce premier mode de réalisation.
  • La figure 3 est une vue en plan correspondante.
  • La figure 4 est une vue analogue à la figure 1, mais illustrant une variante de dispositif de pinçage.
  • La figure 5 est une vue en perspective de l'une des demi-coquilles du dispositif de pinçage de ladite variante.
  • Les figures 6 et 7 sont des vues en coupe longitudinale illustrant l'application de l'invention à des applicateurs à commande pneumatique et mécanique, respectivement.
The description which follows, with reference to the appended drawing given by way of nonlimiting example, will make it clear how the invention is implemented, the features which emerge, both from the drawing and from the text, forming, of course, part of said invention.
  • Figure 1 is a schematic view in longitudinal section of a first embodiment of the applicator, improved according to the invention.
  • Figure 2 is an end view of the clamping device of this first embodiment.
  • Figure 3 is a corresponding plan view.
  • Figure 4 is a view similar to Figure 1, but illustrating a variant of clamping device.
  • Figure 5 is a perspective view of one of the half-shells of the clamping device of said variant.
  • Figures 6 and 7 are views in longitudinal section illustrating the application of the invention to pneumatically and mechanically actuated applicators, respectively.

Dans l'exemple de réalisation représenté sur les figures 1 à 3, un applicateur en forme de pistolet comporte un bâti 1 dans le fût duquel est montée une chambre de chauffe 2, alimentée en courant électrique par l'intermédiaire de conducteurs que l'on n'a pas représentés afin de ne pas compliquer le dessin et qui sont raccordés à un cordon 3 sortant de la crosse 4 du bâti.In the embodiment shown in Figures 1 to 3, a pistol-shaped applicator comprises a frame 1 in the barrel of which is mounted a heating chamber 2, supplied with electric current by means of conductors which are did not represent so as not complicate the drawing and which are connected to a cord 3 emerging from the butt 4 of the frame.

A l'avant du pistolet, la chambre de chauffe se termine, d'une façon usuelle, par une buse de distribution 5 pourvue d'une soupape de retenue non représentée et, à l'arrière, elle se prolonge par une tubulure d'entrée 6 qui se termine par un manchon 7 en matière mauvaise conductrice de la chaleur, par exemple un polytétrafluoro-éthylène (Téflon - marque commerciale déposée). C'est dans ce manchon que sont introduits les bâtonnets 8 de produit à distribuer, par exemple de la colle thermoplastique.At the front of the gun, the heating chamber ends, in a usual manner, by a dispensing nozzle 5 provided with a non-illustrated check valve and, at the rear, it is extended by a manifold. inlet 6 which ends with a sleeve 7 made of a material which is poorly conductive of heat, for example a polytetrafluoroethylene (Teflon - registered trade mark). It is into this sleeve that the rods 8 of product to be dispensed are introduced, for example thermoplastic glue.

Le manchon 7 est pourvu d'une collerette 9 par laquelle il bute sur une cloison 10 du bâti, qu'il traverse sans jeu appréciable.The sleeve 7 is provided with a collar 9 by which it abuts on a partition 10 of the frame, which it passes through without appreciable play.

Au-delà de la cloison 10, le bâti comporte une chambre 11 limitée par une paroi 12 que l'extrémité arrière du manchon 7 traverse par un orifice 13 dans lequel ledit manchon passe avec jeu.Beyond the partition 10, the frame comprises a chamber 11 limited by a wall 12 that the rear end of the sleeve 7 passes through an orifice 13 in which said sleeve passes with clearance.

Sur l'extrémité arrière du manchon 7 est enfilé un dispositif 14 de pinçage. Ce dispositif présente une portion centrale qui passe à faible jeu dans l'orifice 13 et est munie d'une collerette 15 butant sur la face interne de la paroi 12.On the rear end of the sleeve 7 is threaded a pinching device 14. This device has a central portion which passes with little clearance in the orifice 13 and is provided with a flange 15 abutting on the internal face of the wall 12.

Ladite portion centrale se prolonge, dans la chambre 11, par des ailettes divergentes 16, par exemple au nombre de deux et diamétralement opposées. Ces ailettes s'appuient sur la cloison 10 à distance suffisante des bords de celle-ci pour que l'on puisse faire reculer le dispositif 14 dans la chambre 11 en écartant élastiquement lesdites ailettes qui rappelleront le dispositif vers la paroi 12 lorsqu'on cessera d'agir sur lui.Said central portion is extended, in the chamber 11, by divergent fins 16, for example two in number and diametrically opposite. These fins are supported on the partition 10 at a sufficient distance from the edges thereof so that the device 14 can be moved back into the chamber 11 by elastically spreading the said fins which will recall the device towards the wall 12 when we stop to act on him.

Hors de la chambre 11, la portion centrale du dispositif 14 se prolonge par des bras 17, par exemple aussi au nombre de deux, mais décalés de 90° par rapport aux ailettes 16. Ces bras 17 se terminent par des mors 18 dont les arêtes 19 sont incurvées, comme le montre la figure 2, et situées au repos sur une circonférence de diamètre inférieur à celui des bâtonnets 8.Outside the chamber 11, the central portion of the device 14 is extended by arms 17, for example also two in number, but offset by 90 ° with respect to the fins 16. These arms 17 end in jaws 18 whose edges 19 are curved, as shown in FIG. 2, and located at rest on a circumference of diameter smaller than that of the rods 8.

Les arêtes 19 sont biseautées de façon à faciliter l'introduction des bâtonnets entre les mors mais à s'accrocher auxdits bâtonnets lorsqu'ils ont tendance à reculer.The edges 19 are bevelled so as to facilitate the introduction of the rods between the jaws but to cling to said rods when they tend to move back.

Le dispositif de pinçage 14 est de préférence réalisé en matière synthétique rigide et élastique, par exemple en polyamide.The pinching device 14 is preferably made of rigid and elastic synthetic material, for example polyamide.

Il fonctionne comme suit :

  • Lorsqu'après avoir introduit le bâtonnet 8 entre les mors 18, on appuie sur ledit bâtonnet dans le sens de la flèche F, le bâtonnet se déplace vers la chambre de chauffe en fondant peu à peu et en provoquant l'expulsion de la matière fondue par la buse 5, comme dans un pistolet classique.
It works as follows:
  • When after having introduced the stick 8 between the jaws 18, the said stick is pressed in the direction of the arrow F, the stick moves towards the heating chamber, gradually melting and causing the expulsion of the melted material through nozzle 5, as in a conventional pistol.

Ce déplacement s'accompagne toutefois d'un entraînement vers l'avant du dispositif de pinçage 14 dont les mors 18 enserrent le bâtonnet, entraînement que permet l'élasticité des ailettes 16. Le bâtonnet peut toutefois glisser sur les mors 18 pour s'enfoncer dans la chambre de chauffe au fur et à mesure que la matière fondue est expulsée par la buse 5.This movement is however accompanied by a forward drive of the clamping device 14 whose jaws 18 grip the stick, drive which allows the elasticity of the fins 16. The stick can however slide on the jaws 18 to sink in the heating chamber as the molten material is expelled through the nozzle 5.

Dès que l'on cesse d'appuyer sur le bâtonnet 8, les ailettes élastiques 16 se redressent et font reculer le dispositif 14 avec le bâtonnet, en sens inverse de la flèche F, de quelques millimètres.As soon as one stops pressing on the stick 8, the elastic fins 16 straighten up and make the device 14 move back with the stick, in the opposite direction to the arrow F, by a few millimeters.

Ce recul du bâtonnet compense les dilatations et provoque, dans la chambre de chauffe, un effet d'aspiration qui évite toute sortie intempestive de matière fondue par la buse 5.This retraction of the stick compensates for the expansions and causes, in the heating chamber, a suction effect which prevents any untimely exit of molten material by the nozzle 5.

En outre, le bâtonnet se trouve maintenu en position correcte à l'entrée du manchon 7.In addition, the stick is kept in the correct position at the inlet of the sleeve 7.

Lorsque le bâtonnet a entièrement pénétré dans le manchon 7, le dispositif de pinçage revient seul en arrière. Il sert alors de guide pour l'introduction d'un autre bâtonnet.When the stick has fully penetrated into the sleeve 7, the pinching device alone returns back. It then serves as a guide for the introduction of another stick.

La variante des figures 4 et 5 fonctionne de la même façon que le mode de réalisation qu'on vient de décrire.The variant of FIGS. 4 and 5 works in the same way as the embodiment which has just been described.

Le dispositif de pinçage 14 est cette fois réalisé en trois parties à savoir deux demi-coquilles 20 et un ressort 21.The clamping device 14 is this time produced in three parts, namely two half-shells 20 and a spring 21.

Les demi-coquilles 20 présentent chacune un bras 17 terminé par un mors 18 à arête biseautée 19, comme les éléments correspondants du mode de réalisation précédemment décrit. Leur embase 22 s'appuie contre la paroi 12, dans la chambre 11, sous l'effet du ressort 21, afin d'assurer le serrage. Le ressort 21 bute d'autre part sur la cloison 10 et entoure le manchon 7. Une portée de centrage 23 est prévue pour le ressort 21 à l'arrière de chacune des demi-coquilles 20. Ces dernières peuvent être réalisées en métal, par exemple un alliage léger.The half-shells 20 each have an arm 17 terminated by a jaw 18 with a bevelled edge 19, like the corresponding elements of the embodiment described above. Their base 22 is pressed against the wall 12, in the chamber 11, under the effect of the spring 21, in order to ensure the tightening. The spring 21 also abuts on the partition 10 and surrounds the sleeve 7. A centering surface 23 is provided for the spring 21 at the rear of each of the half-shells 20. The latter can be made of metal, by example a light alloy.

Quelle que soit la forme de réalisation que l'on adopte, le dispositif de pinçage élastique 14 peut être adapté à des applicateurs dans lesquels les bâtonnets 8 sont déplacés par un dispositif approprié et non plus par poussée directe de l'utilisateur comme dans les exemples précédents.Whichever embodiment is adopted, the elastic clamping device 14 can be adapted to applicators in which the sticks 8 are moved by an appropriate device and no longer by direct pushing by the user as in the examples previous.

Sur la figure 6, le dispositif 14, ici en une seule pièce comme celui des figures 1 à 3, est monté, entre les parois 10 et 12, dans la chambre 11 du bâti, sur la tubulure de sortie 6 de la chambre de chauffe 2. Les bras 17 et les mors 18 pénètrent dans le cylindre 25 du dispositif pneumatique qui sert à faire avancer les bâtonnets 8.In FIG. 6, the device 14, here in a single piece like that of FIGS. 1 to 3, is mounted, between the walls 10 and 12, in the chamber 11 of the frame, on the outlet pipe 6 of the heating chamber 2. The arms 17 and the jaws 18 penetrate into the cylinder 25 of the pneumatic device which serves to advance the sticks 8.

Ce dispositif pneumatique, que l'on actionne à l'aide d'un bouton-poussoir 26, comporte, d'une manière usuelle, un piston annulaire 27 qui coulisse dans le cylindre 25 et dans lequel le bâtonnet 8 est engagé et saisi de façon à être poussé vers l'avant.This pneumatic device, which is actuated using a push button 26, comprises, in the usual manner, an annular piston 27 which slides in the cylinder 25 and in which the stick 8 is engaged and gripped by so as to be pushed forward.

L'air comprimé arrive à l'arrière du piston par une tubulure 28, l'étanchéité étant assurée par des joints 29 et 30 qui entourent respectivement le piston 27 et sa tige 31. Cette dernière traverse la paroi arrière 32 du cylindre 25.The compressed air arrives at the rear of the piston through a tube 28, the seal being ensured by seals 29 and 30 which respectively surround the piston 27 and its rod 31. The latter crosses the rear wall 32 of the cylinder 25.

A l'avant du piston est prévu un ressort antagoniste 33 centré par un bossage 34 du piston et qui s'appuie sur la paroi avant 35 du cylindre.At the front of the piston is provided an opposing spring 33 centered by a boss 34 of the piston and which rests on the front wall 35 of the cylinder.

Le dispositif 14 reprend sa place normale, en faisant reculer le bâtonnet, lorsque le piston effectue sa course de retour sous l'effet du ressort 33.The device 14 returns to its normal place, making the rod move back, when the piston makes its return stroke under the effect of the spring 33.

Dans la variante de la figure 7, où le même type de dispositif de pinçage a été choisi pour des raisons de simplicité, l'agencement est le même que sur les figures 1 à 3 mais le bâti 1 contient à l'arrière un dispositif d'avance 36, de type classique.In the variant of FIG. 7, where the same type of clamping device has been chosen for for reasons of simplicity, the arrangement is the same as in FIGS. 1 to 3, but the frame 1 contains at the rear an advance device 36, of the conventional type.

Ce dispositif comporte une came dentée 37 qu'une tringlerie non représentée permet de déplacer lorsqu'on agit sur une détente 38 montée dans la crosse 4 du pistolet.This device comprises a toothed cam 37 which a linkage not shown makes it possible to move when acting on a trigger 38 mounted in the butt 4 of the gun.

A part cela, le fonctionnement est rigoureusement le même que dans l'exemple des figures 1 à 3.Otherwise, the operation is strictly the same as in the example in FIGS. 1 to 3.

Claims (10)

1. Applicator of molten materials, comprising a frame supporting a melting chamber (2) provided with a discharge nozzle (5) and with an inlet sleeve (6) in which a rod (8) of material to be discharged is engageable so as to progressively enter the melting chamber (2) while forcing out the molten material through the nozzle (5), said inlet sleeve (6) being provided with a gripping device adapted to catch the rod (8), characterized in that the gripping device (14) is adapted to be dragged along by the rod (8), against an elastic return force, when the rod is pushed forward, then to draw back said rod (8) by the action of the return force, when the push on said rod (8) is discontinued.
2. Applicator according to claim 1, characterized in that the gripping device (14) is slidably mounted on the inlet sleeve (6) and has spring arms (17), provided with gripping jaws (18), intended to clamp the rod (8) at some distance above said sleeve (6).
3. Applicator according to claim 2, characterized in that the gripping jaws (18) have chamfered edges (19), by which they come into contact with the rod (8).
4. Applicator according to any one of claims 2 or 3, characterized in that the gripping device (14) comprises spring wings, by which it bears upon the frame (10) and which exert the return force.
5. Applicator according to any one of claims 1 to 4, characterized in that the gripping device is made of one piece.
6. Applicator according to any one of claims 2 or 3, characterized in that the gripping device (14) comprises a spring (21) which bears upon the frame (10) for exerting the return force.
7. Applicator according to claim 6, characterized in that the gripping device (14) comprises two halfshells (20) forming a flange (22), upon which the spring (21) bears for closing the gripping jaws (18) together.
8. Applicator according to any one of claims 1 to 7, characterized in that the gripping device (14) is mounted upon the protruding part of the inlet sleeve (6) of an applicator into which the rod (8) is directly pushed by the operator.
9. Applicator according to any one of claims 1 to 7, characterized in that the gripping device (14) is mounted in the applicator below the device (27) intended to feed the rod forward.
10. Applicator according to claim 9, comprising a feeding device with piston (27), characterized in that the gripping device (14) enters the cylinder (25) of the feeding device (27).
EP80401774A 1979-12-14 1980-12-10 Applicator of molten materials such as thermoplastic glues Expired EP0030893B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7930718 1979-12-14
FR7930718A FR2471221A1 (en) 1979-12-14 1979-12-14 APPLICATOR OF MOLTEN MATERIALS SUCH AS THERMOPLASTIC ADHESIVES

Publications (2)

Publication Number Publication Date
EP0030893A1 EP0030893A1 (en) 1981-06-24
EP0030893B1 true EP0030893B1 (en) 1984-06-13

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Family Applications (1)

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EP80401774A Expired EP0030893B1 (en) 1979-12-14 1980-12-10 Applicator of molten materials such as thermoplastic glues

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US (1) US4379516A (en)
EP (1) EP0030893B1 (en)
JP (1) JPS56129053A (en)
BR (1) BR8008067A (en)
ES (1) ES267085Y (en)
FR (1) FR2471221A1 (en)

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NZ210504A (en) * 1983-12-22 1987-03-31 Bostik New Zealand Ltd Hot melt dispenser:spring urges hot melt material out of melt chamber when not dispensing
GB8514851D0 (en) * 1985-06-12 1985-07-17 Bostik Ltd Hot melt dispensers
US4692587A (en) * 1986-02-19 1987-09-08 Spirk Jr John W Hand tool and support
DE8613376U1 (en) * 1986-05-16 1986-06-26 Ursprung, Reinhard, 8088 Eching Hot glue gun with mechanical feed
US5067887A (en) * 1987-08-07 1991-11-26 Black & Decker Inc. Hot-melt adhesive recycling system
US4951846A (en) * 1989-02-02 1990-08-28 Minnesota Mining And Manufacturing Company Hot melt applicator with anti-drip mechanism
US5462206A (en) * 1994-10-12 1995-10-31 Kwasie; Jon B. Melting assembly for thermoplastic materials
US5971212A (en) * 1997-10-27 1999-10-26 Drader; Clarence H. Apparatus for welding thermoplastics by high pressure injection
US6457606B1 (en) * 2000-01-27 2002-10-01 Bright Solutions, Inc. Method and device for introducing fluid material into a climate control system
US7775403B2 (en) * 2005-08-31 2010-08-17 Robert Bosch Gmbh Power hand tool having a retractable front stand
US9643200B2 (en) * 2014-12-19 2017-05-09 Richard A. Belanger Squeeze container liquid extrusion tool
CN107159530A (en) * 2017-06-16 2017-09-15 奉化市威优特电器有限公司 A kind of heater of thermosol gelgun
US10486186B2 (en) * 2018-03-14 2019-11-26 Adhesive Technologies, Inc. No-drip hot melt glue gun

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US3314574A (en) * 1965-08-11 1967-04-18 United Shoe Machinery Corp Plastic cement heating, melting and extruding tool
US3774817A (en) * 1971-03-10 1973-11-27 Thermotech Inc Hot melt adhesive applicator
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US3774814A (en) * 1971-10-26 1973-11-27 Star Kist Foods Metering apparatus
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US4090643A (en) * 1976-09-17 1978-05-23 The Terrell Corporation Hot melt applicator
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DE2829598A1 (en) * 1978-07-05 1980-01-24 Hilti Ag Dosing gun for thermoplastics adhesive - has plate-shaped slide and U=shaped clamp for stepped rod advance

Also Published As

Publication number Publication date
EP0030893A1 (en) 1981-06-24
US4379516A (en) 1983-04-12
ES267085U (en) 1983-04-16
FR2471221A1 (en) 1981-06-19
BR8008067A (en) 1981-06-23
JPS56129053A (en) 1981-10-08
ES267085Y (en) 1983-11-16
FR2471221B1 (en) 1984-09-07

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