EP0487381A1 - Clay pigeon target and process for manufacturing - Google Patents
Clay pigeon target and process for manufacturing Download PDFInfo
- Publication number
- EP0487381A1 EP0487381A1 EP91403073A EP91403073A EP0487381A1 EP 0487381 A1 EP0487381 A1 EP 0487381A1 EP 91403073 A EP91403073 A EP 91403073A EP 91403073 A EP91403073 A EP 91403073A EP 0487381 A1 EP0487381 A1 EP 0487381A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plaster
- target
- alfa
- targets
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41J—TARGETS; TARGET RANGES; BULLET CATCHERS
- F41J1/00—Targets; Target stands; Target holders
- F41J1/01—Target discs characterised by their material, structure or surface, e.g. clay pigeon targets characterised by their material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41J—TARGETS; TARGET RANGES; BULLET CATCHERS
- F41J9/00—Moving targets, i.e. moving when fired at
- F41J9/16—Clay-pigeon targets; Clay-disc targets
Definitions
- the subject of the present invention is a target of the type known as a clay pigeon which is thrown into the air by a launching device and which must be hit by a projectile which causes it to break and fall back to the ground in several parts.
- the present invention also relates to a method of manufacturing such targets which are used in particular in clay pigeon shooting.
- Known targets of this type are generally obtained from a mixture of clay and coal pitch. They meet the specifications defined for the sports for which they are intended but they have drawbacks which make their use more and more difficult.
- the pitch of coal which serves as a binder to the clay is not biodegradable and it contains many aromatic compounds which have a high polluting character.
- the present invention relates to targets of the type in question which have the advantage of being produced with a natural product and consequently of not being polluting for the environment.
- the present invention relates to a target of the clay pigeon type, characterized in that it is essentially constituted by a molding of semi-hydrated plaster of the alpha type.
- plaster is obtained from calcium sulphate hydrated by two molecules of water which are found naturally in deposits and which is also known as gypsum.
- Alfa plaster is obtained by baking gypsum at around 120 ° C in an atmosphere saturated with water vapor.
- the gypsum loses one of its two water molecules to give the plaster alfa.
- a fluid paste is produced by mixing with the alfa plaster a quantity of mixing water which it is advantageous to choose as low as possible.
- 100 liters of mixing water can be used according to the invention for approximately 250 kg of alfa plaster.
- alfa plaster having a particle size of less than 100 microns.
- the plaster is tempered under vacuum and then poured into a two-part mold made of elastomer, which has the advantage of facilitating demolding.
- the necessary quantity of alfa plaster is poured into the lower part of the mold which has the hollow shape of the convex surface of the target.
- the upper part of the mold is then applied to the plaster which has a convex shape corresponding to the internal concave part of the target while maintaining the two parts of the mold in the position they must have to give the target the desired thickness and this until the plaster is set, that is to say for a time of approximately 5 to 7 minutes.
- the targets are advantageously placed in an oven heated for example to 80 ° C. then preferably placed in a microwave dryer to bring them to a humidity level of approximately 5%.
- the targets are then painted in a visible color such as yellow or orange using a water paint, preferably mineral and non-toxic.
- This paint is preferably applied with a spray gun advantageously at the outlet of the oven so that the heat of the target facilitates the drying of the paint.
- the single figure of the drawing represents a sectional view of a target according to the invention.
- a traditional target which is in the form of a convex cap having a substantially flat bottom 1 extended by a flat conical crown 2 and then by two cylindrical surfaces 3 and 4 which are used for launching the target. .
- the interior of the target has a concave cavity 5 which leaves the various parts of the target with a substantially constant thickness.
- the target has a shape of revolution around its axis 6.
- alfa plaster (semi-hydrated) is mixed in water using a continuous vacuum mixer, at a rate of 250 parts in weight of alfa plaster per 100 parts of water.
- 150 g of the plaster thus mixed are poured into an elastomer mold having the upper face of the target hollow as shown in FIG. 1, this face of the mold being upwards.
- a counter mold is also applied to the mold, also made of elastomer, the shape of which corresponds to the hollow volume 5, and the plaster is kept trapped between the two parts of the mold which give it the shape shown in the drawing, for the time which is necessary for the setting of the plaster is approximately 5 to 7 minutes, during which time the mold and its contents are placed in an atmosphere of approximately 30 ° C. to increase the speed of setting.
- the counter mold is then lifted which corresponds to the interior of the target which is ejected, by deforming the lower part of the mold.
- the targets are then taken out of the mold to be placed in an oven heated for example to 80 ° C. to carry out their drying, which can advantageously be finished in a microwave dryer so as to reduce their humidity. at around 5%.
- the targets are then covered with paint, preferably with water applied, for example with a spray gun, while they are still hot, which accelerates the drying of the paint.
- This paint is advantageously based on non-polluting mineral or organic dyes.
- the targets according to the invention have been found to be perfectly suitable for their use. They do not require a systematic collection of their pieces after use, taking into account that the gypsum which results from the setting of alfa plaster is a natural product which is easily absorbed by the ground.
- alfa plaster such as for example a small amount of sand or biodegradable product.
- the target can be colored in the mass, although this procedure requires greater quantities of dyes.
Abstract
Description
La présente invention a pour objet une cible du type connu sous le nom de pigeon d'argile qui est projetée en l'air par un dispositif lanceur et qui doit être atteinte par un projectile qui provoque sa rupture et sa retombée sur le sol en plusieurs morceaux.The subject of the present invention is a target of the type known as a clay pigeon which is thrown into the air by a launching device and which must be hit by a projectile which causes it to break and fall back to the ground in several parts.
La présente invention concerne également un procédé de fabrication de telles cibles qui sont notamment utilisées dans la pratique du ball-trap.The present invention also relates to a method of manufacturing such targets which are used in particular in clay pigeon shooting.
Les cibles connues de ce type sont généralement obtenues à partir d'un mélange d'argile et de brai de houille. Elles répondent aux spécifications définies pour les sports auxquels elles sont destinées mais elles présentent des inconvénients qui rendent leur utilisation de plus en plus difficile.Known targets of this type are generally obtained from a mixture of clay and coal pitch. They meet the specifications defined for the sports for which they are intended but they have drawbacks which make their use more and more difficult.
En effet, le brai de houille qui sert de liant à l'argile n'est pas biodégradable et il comporte de nombreux composés aromatiques qui présentent un caractère polluant élevé.Indeed, the pitch of coal which serves as a binder to the clay is not biodegradable and it contains many aromatic compounds which have a high polluting character.
Vu le très grand nombre de cibles de ce type qui sont actuellement utilisées, il est devenu indispensable, pour des raisons écologiques, de procéder après chaque séance de tir au ramassage systématique des morceaux de cibles qui sont retombés sur le sol, ceci implique un travail long et fastidieux qui, quels que soient les soins que l'on puisse prendre, reste toujours imparfait avec pour résultat une pollution non négligeable de l'environnement.Considering the very large number of targets of this type which are currently used, it became essential, for ecological reasons, to proceed after each shooting session to the systematic collection of the pieces of targets which fell on the ground, this implies a work long and tedious which, whatever the care that one can take, always remains imperfect with as a result a significant pollution of the environment.
Diverses tentatives pour réaliser des cibles avec des matériaux différents n'ont pas donné satisfaction.Various attempts to make targets with different materials have not been successful.
La présente invention est relative à des cibles du type en question qui présentent l'avantage d'être réalisées avec un produit naturel et en conséquence de ne pas être polluant pour l'environnement.The present invention relates to targets of the type in question which have the advantage of being produced with a natural product and consequently of not being polluting for the environment.
La présente invention a pour objet une cible du type pigeon d'argile, caractérisée par le fait qu'elle est essentiellement constituée par un moulage de plâtre semi-hydraté de type alpha.The present invention relates to a target of the clay pigeon type, characterized in that it is essentially constituted by a molding of semi-hydrated plaster of the alpha type.
On sait que le plâtre est obtenu à partir de sulfate de calcium hydraté par deux molécules d'eau que l'on trouve à l'état naturel dans des gisements et qui également connu sous le nom de gypse.We know that plaster is obtained from calcium sulphate hydrated by two molecules of water which are found naturally in deposits and which is also known as gypsum.
Le plâtre alfa s'obtient en cuisant le gypse à environ 120°C dans une atmosphère saturée en vapeur d'eau.Alfa plaster is obtained by baking gypsum at around 120 ° C in an atmosphere saturated with water vapor.
Lors de cette cuisson, le gypse perd une de ses deux molécules d'eau pour donner le plâtre alfa.During this cooking, the gypsum loses one of its two water molecules to give the plaster alfa.
Lorsque le plâtre alfa semi-hydraté est à nouveau mélangé à de l'eau, il se réhydrate à nouveau pour donner le produit naturel qui est le gypse.When the semi-hydrated alfa plaster is mixed again with water, it rehydrates again to give the natural product which is gypsum.
Il convient de remarquer que non seulement, le gypse est un produit naturel, mais encore qu'il est déjà utilisé pour amender certaines terres agricoles.It should be noted that not only is gypsum a natural product, but also that it is already used to amend certain agricultural land.
Pour réaliser les cibles selon l'invention, on réalise une pâte fluide en mélangeant au plâtre alfa une quantité d'eau de gâchage qu'il est avantageux de choisir aussi faible que possible.To produce the targets according to the invention, a fluid paste is produced by mixing with the alfa plaster a quantity of mixing water which it is advantageous to choose as low as possible.
A titre d'exemple, on peut utiliser selon l'invention 100 litres d'eau de gâchage pour environ 250 kg de plâtre alfa.By way of example, 100 liters of mixing water can be used according to the invention for approximately 250 kg of alfa plaster.
Pour mettre en oeuvre l'invention, on utilise de préférence du plâtre alfa ayant une granulométrie inférieure à 100 microns.To implement the invention, use is preferably made of alfa plaster having a particle size of less than 100 microns.
Selon un mode de mise en oeuvre préférée de l'invention, le plâtre est gâché sous vide puis coulé dans un moule en deux parties réalisé en élastomère ce qui a pour avantage de faciliter le démoulage.According to a preferred embodiment of the invention, the plaster is tempered under vacuum and then poured into a two-part mold made of elastomer, which has the advantage of facilitating demolding.
Pour réaliser une cible selon l'invention, on verse par exemple la quantité nécessaire de plâtre alfa préalablement gâché sous vide dans la partie inférieure du moule qui possède la forme en creux de la surface convexe de la cible.To produce a target according to the invention, for example, the necessary quantity of alfa plaster, previously tempered under vacuum, is poured into the lower part of the mold which has the hollow shape of the convex surface of the target.
On applique alors sur le plâtre la partie supérieure du moule qui a une forme convexe correspondant à la partie concave interne de la cible en maintenant les deux parties du moule dans la position qu'elles doivent avoir pour donner à la cible l'épaisseur souhaitée et ceci jusqu'à prise du plâtre, c'est-à-dire pendant un temps d'environ 5 à 7 minutes.The upper part of the mold is then applied to the plaster which has a convex shape corresponding to the internal concave part of the target while maintaining the two parts of the mold in the position they must have to give the target the desired thickness and this until the plaster is set, that is to say for a time of approximately 5 to 7 minutes.
Conformément à l'invention, et pour accélérer la fabrication des cibles, il est intéressant de réduire le temps de moulage en ajoutant lors du gâchage un accélérateur de prise tel que du plâtre hydraté (gypse), ou encore en diminuant la quantité d'eau de gâchage, en élevant la température de cette dernière ou en prolongeant le temps d'agitation avant moulage.In accordance with the invention, and in order to accelerate the production of the targets, it is advantageous to reduce the molding time by adding during the mixing a setting accelerator such as hydrated plaster (gypsum), or even by reducing the amount of water. of mixing, by raising the temperature of the latter or by extending the agitation time before molding.
Après le moulage, c'est-à-dire après que le plâtre a effectué sa prise, les cibles sont avantageusement placées dans une étuve chauffée par exemple à 80°C puis de préférence placées dans un séchoir à micro-ondes pour les amener à un taux d'humidité d'environ 5 %.After molding, that is to say after the plaster has set, the targets are advantageously placed in an oven heated for example to 80 ° C. then preferably placed in a microwave dryer to bring them to a humidity level of approximately 5%.
Les cibles sont ensuite peintes d'une couleur visible telle que jaune ou orange en utilisant une peinture à l'eau de préférence minérale et non toxique.The targets are then painted in a visible color such as yellow or orange using a water paint, preferably mineral and non-toxic.
Cette peinture est appliquée de préférence au pistolet avantageusement à la sortie de l'étuve pour que la chaleur de la cible facilite le séchage de la peinture.This paint is preferably applied with a spray gun advantageously at the outlet of the oven so that the heat of the target facilitates the drying of the paint.
Les cibles ainsi obtenues répondent sans difficulté aux normes fixées par les fédérations sportives.The targets thus obtained easily meet the standards set by the sports federations.
En particulier, elles peuvent facilement s'adapter aux différentes dimensions et aux différents poids nécessaires pour simuler différents gibiers ou pour s'entraîner à des tirs plus ou moins difficiles.In particular, they can easily adapt to the different dimensions and the different weights necessary to simulate different game or to practice more or less difficult shots.
Elles sont d'un prix de revient peu élevé et d'une fabrication simple. Après usage, leurs morceaux n'ont pas besoin d'être ramassés en raison du fait que le gypse est un produit naturel qui est facilement absorbé par le terrain sur lequel il tombe.They are of a low cost price and simple to manufacture. After use, their pieces do not need to be picked up due to the fact that gypsum is a natural product which is easily absorbed by the ground on which it falls.
Dans le but de mieux faire comprendre l'invention, on va en décrire maintenant à titre d'illustration et sans aucun caractère limitatif un mode de réalisation pris comme exemple et représenté sur le dessin annexé.In order to better understand the invention, we will now describe by way of illustration and without any limiting character an embodiment taken as an example and shown in the accompanying drawing.
La figure unique du dessin représente une vue en coupe d'une cible selon l'invention.The single figure of the drawing represents a sectional view of a target according to the invention.
On a représenté sur le dessin une cible traditionnelle qui se présente sous la forme d'une calotte convexe comportant un fond 1 sensiblement plan prolongé par une couronne conique aplatie 2 puis par deux surfaces cylindriques 3 et 4 qui sont utilisés pour le lancement de la cible.There is shown in the drawing a traditional target which is in the form of a convex cap having a substantially flat bottom 1 extended by a flat conical crown 2 and then by two
L'intérieur de la cible présente une cavité concave 5 qui laisse aux différentes parties de la cible une épaisseur sensiblement constante.The interior of the target has a
La cible a une forme de révolution autour de son axe 6.The target has a shape of revolution around its axis 6.
A titre d'exemple, pour réaliser une cible, selon l'invention, on gâche du plâtre alfa (semi-hydraté) dans de l'eau à l'aide d'un malaxeur en continu sous vide, à raison de 250 parties en poids de plâtre alfa pour 100 parties d'eau.For example, to make a target according to the invention, alfa plaster (semi-hydrated) is mixed in water using a continuous vacuum mixer, at a rate of 250 parts in weight of alfa plaster per 100 parts of water.
On verse 150 g du plâtre ainsi gâché dans un moule en élastomère présentant en creux la face supérieure de la cible telle que représentée sur la figure 1, cette face du moule étant vers le haut.150 g of the plaster thus mixed are poured into an elastomer mold having the upper face of the target hollow as shown in FIG. 1, this face of the mold being upwards.
On applique sur le moule un contre-moule également en élastomère dont la forme correspond au volume creux 5, et on maintient le plâtre emprisonné entre les deux parties du moule qui lui donnent la forme représentée sur le dessin, pendant le temps qui est nécessaire pour la prise du plâtre soit d'environ 5 à 7 minutes, temps pendant lequel le moule et son contenu sont placés dans une ambiance d'environ 30°C pour accroître la vitesse de la prise.A counter mold is also applied to the mold, also made of elastomer, the shape of which corresponds to the
On soulève alors le contre-moule qui correspond à l'intérieur de la cible que l'on éjecte, en déformant la partie inférieure du moule.The counter mold is then lifted which corresponds to the interior of the target which is ejected, by deforming the lower part of the mold.
Le procédé de fabrication vient d'être décrit en se référant à un moule mais il est clair que dans un processus industriel, on peut avantageusement opérer sur une bande transporteuse comportant toute une série de moules.The manufacturing process has just been described with reference to a mold, but it is clear that in an industrial process, it is advantageously possible to operate on a conveyor belt comprising a whole series of molds.
Les cibles sont ensuite reprises à la sortie du moule pour être placées dans une étuve chauffée par exemple à 80°C pour procéder à leur séchage, lequel peut être avantageusement terminé dans un séchoir à micro-ondes de manière à ramener leur taux d'humidité à environ 5 %.The targets are then taken out of the mold to be placed in an oven heated for example to 80 ° C. to carry out their drying, which can advantageously be finished in a microwave dryer so as to reduce their humidity. at around 5%.
Les cibles sont ensuite recouvertes de peinture de préférence à l'eau appliquée par exemple au pistolet alors qu'elles sont encore chaudes, ce qui accélère le séchage de la peinture.The targets are then covered with paint, preferably with water applied, for example with a spray gun, while they are still hot, which accelerates the drying of the paint.
Cette peinture est avantageusement à base de colorants non polluants minéraux ou organiques.This paint is advantageously based on non-polluting mineral or organic dyes.
Les cibles selon l'invention se sont révélées convenir parfaitement à leur utilisation. Elles ne nécessitent pas un ramassage systématique de leurs morceaux après usage, compte-tenu du fait que le gypse qui résulte de la prise du plâtre alfa est un produit naturel qui est facilement absorbé par le terrain.The targets according to the invention have been found to be perfectly suitable for their use. They do not require a systematic collection of their pieces after use, taking into account that the gypsum which results from the setting of alfa plaster is a natural product which is easily absorbed by the ground.
Il est bien entendu que le mode de réalisation qui a été décrit ne présente aucun caractère limitatif et qu'il pourra recevoir toutes modifications désirables sans sortir pour cela du cadre de l'invention.It is understood that the embodiment which has been described has no limiting character and that it may receive any desirable modifications without departing from the scope of the invention.
En particulier, il est clair que l'on pourrait éventuellement ajouter certains additifs au plâtre alfa comme par exemple une faible quantité de sable ou de produit biodégradable.In particular, it is clear that one could possibly add certain additives to alfa plaster such as for example a small amount of sand or biodegradable product.
De même, conformément à l'invention, on peut colorer la cible dans la masse bien que cette manière de faire nécessite des quantités supérieures de colorants.Likewise, in accordance with the invention, the target can be colored in the mass, although this procedure requires greater quantities of dyes.
Claims (12)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9014225 | 1990-11-15 | ||
FR9014225A FR2669415B1 (en) | 1990-11-15 | 1990-11-15 | TARGET SAID CLAY PIGEON AND ITS MANUFACTURING METHOD. |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0487381A1 true EP0487381A1 (en) | 1992-05-27 |
Family
ID=9402226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91403073A Withdrawn EP0487381A1 (en) | 1990-11-15 | 1991-11-15 | Clay pigeon target and process for manufacturing |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0487381A1 (en) |
FR (1) | FR2669415B1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5316313A (en) * | 1993-12-09 | 1994-05-31 | Moore Patrick T | Frangible biodegradable clay target |
WO1994012847A1 (en) * | 1992-11-20 | 1994-06-09 | Riteflite Pty. Limited | Target for shooting |
FR2759252A1 (en) * | 1997-02-11 | 1998-08-14 | Imc Inst Des Materiaux Composi | Degradable non-toxic material for gold tees and clay pigeons |
US5947475A (en) * | 1997-05-16 | 1999-09-07 | Reagent Chemical & Research, Inc. | Environmentally safe projectable targets |
US6394457B2 (en) | 1997-05-16 | 2002-05-28 | Reagent Chemical & Res Inc | Safe projectable target |
ES2180389A1 (en) * | 2000-08-24 | 2003-02-01 | Santamaria Fernando Basco | Fabrication of gunshot competition and training clay targets consists of hammer milling, wet pressing and drying of clay, for baking |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2382670A1 (en) * | 1977-03-02 | 1978-09-29 | Hansen Ib Schreiner | PROCESS FOR THE PRODUCTION OF A NON-TOXIC CLAY PIGEON AND PRODUCT OBTAINED |
GB2066235A (en) * | 1979-12-21 | 1981-07-08 | Hukkanen P | Producing disposable targets for shooting sports and othersimilar purposes |
US4623150A (en) * | 1982-06-18 | 1986-11-18 | Reagent Chemical And Research, Inc. | Environmentally acceptable frangible target compositions |
-
1990
- 1990-11-15 FR FR9014225A patent/FR2669415B1/en not_active Expired - Fee Related
-
1991
- 1991-11-15 EP EP91403073A patent/EP0487381A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2382670A1 (en) * | 1977-03-02 | 1978-09-29 | Hansen Ib Schreiner | PROCESS FOR THE PRODUCTION OF A NON-TOXIC CLAY PIGEON AND PRODUCT OBTAINED |
GB2066235A (en) * | 1979-12-21 | 1981-07-08 | Hukkanen P | Producing disposable targets for shooting sports and othersimilar purposes |
US4623150A (en) * | 1982-06-18 | 1986-11-18 | Reagent Chemical And Research, Inc. | Environmentally acceptable frangible target compositions |
Non-Patent Citations (1)
Title |
---|
SYNDICAT NATIONAL DES INDUSTRIES DU PLATRE: "Plâtre". "Physico-Chimie, Fabrication et Emplois", 1982, pages 114-115,253-257, Eyrolles, Paris, FR * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994012847A1 (en) * | 1992-11-20 | 1994-06-09 | Riteflite Pty. Limited | Target for shooting |
US5316313A (en) * | 1993-12-09 | 1994-05-31 | Moore Patrick T | Frangible biodegradable clay target |
FR2759252A1 (en) * | 1997-02-11 | 1998-08-14 | Imc Inst Des Materiaux Composi | Degradable non-toxic material for gold tees and clay pigeons |
US5947475A (en) * | 1997-05-16 | 1999-09-07 | Reagent Chemical & Research, Inc. | Environmentally safe projectable targets |
US6394457B2 (en) | 1997-05-16 | 2002-05-28 | Reagent Chemical & Res Inc | Safe projectable target |
US6428007B2 (en) | 1997-05-16 | 2002-08-06 | Reagent Chemical & Research, Inc. | Environmentally safe projectable targets |
ES2180389A1 (en) * | 2000-08-24 | 2003-02-01 | Santamaria Fernando Basco | Fabrication of gunshot competition and training clay targets consists of hammer milling, wet pressing and drying of clay, for baking |
Also Published As
Publication number | Publication date |
---|---|
FR2669415B1 (en) | 1994-11-18 |
FR2669415A1 (en) | 1992-05-22 |
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