EP0076520B1 - Air gun - Google Patents

Air gun Download PDF

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Publication number
EP0076520B1
EP0076520B1 EP82109226A EP82109226A EP0076520B1 EP 0076520 B1 EP0076520 B1 EP 0076520B1 EP 82109226 A EP82109226 A EP 82109226A EP 82109226 A EP82109226 A EP 82109226A EP 0076520 B1 EP0076520 B1 EP 0076520B1
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EP
European Patent Office
Prior art keywords
chamber
air
auxiliary
piston
principal
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Expired
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EP82109226A
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German (de)
French (fr)
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EP0076520A1 (en
Inventor
Sigfrid Olofsson
Chester Wickenberg
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Individual
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Individual
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Priority claimed from ES506667A external-priority patent/ES8306867A1/en
Priority claimed from ES513092A external-priority patent/ES513092A0/en
Application filed by Individual filed Critical Individual
Priority to AT82109226T priority Critical patent/ATE14628T1/en
Publication of EP0076520A1 publication Critical patent/EP0076520A1/en
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Publication of EP0076520B1 publication Critical patent/EP0076520B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B11/00—Compressed-gas guns, e.g. air guns; Steam guns
    • F41B11/60—Compressed-gas guns, e.g. air guns; Steam guns characterised by the supply of compressed gas
    • F41B11/68—Compressed-gas guns, e.g. air guns; Steam guns characterised by the supply of compressed gas the gas being pre-compressed before firing

Definitions

  • the present invention relates to improvements made to air rifles and, more particularly, to the piston system for compressing the air in the chamber intended for its storage before the time of shooting.
  • the air rifle has found multiple applications in the field of sports and toys.
  • the principle consists essentially in applying an impulse to a small bullet along the barrel; this bullet is projected by a mass of air previously compressed, during the expansion, comes into contact with the zone in which the bullet is located, in the core of the barrel, so that the potential energy of the compressed air can act on said bullet by pushing it along the barrel; the potential energy of the compressed air is then transformed into kinetic energy, that of the bullet at the exit of the barrel, so that according to the amplitude of this kinetic energy, one obtains a more or less great range of the shooting.
  • the improvements which are the subject of the present invention essentially aim at obtaining a more progressive action of the compressed air on the bullet in the space traversed by it along the barrel, so that the force applied to the bullet is more uniform and the acceleration more constant; a better use of the potential energy of the compressed air is thus obtained and, therefore, a marked improvement in the firing power as well as its precision.
  • the improvements aimed at obtaining said objectives are essentially based on the constitution of a main piston system intended for the compression of air, in which said piston has internally a closed auxiliary chamber by a free auxiliary piston, the latter having a special retaining seal which allows an air passage so as to obtain the pressure balance between the main compressed air chamber and said auxiliary chamber; thus, once the loading of the weapon carried out, that is to say once the air intended for the projection will have been duly compressed, it 'establishes a balance of pressures between the main chamber of compressed air and said auxiliary chamber separated by the free auxiliary piston, so that at the time of firing, the transmission of energy from the compressed air will be more progressive, which is the objective sought.
  • This first embodiment essentially provides for the constitution of the auxiliary piston using a device formed by a rod provided, at one end, with a circular head precisely serving as a piston with an adjusted "retaining" member and, at the other end, a stop or any other stop member intended to limit the axial position of advance of the piston assembly.
  • the production of the auxiliary piston may vary within wide limits with only one condition, which must be fulfilled in all cases: it must be arranged so as to slide inside a chamber or housings of the main piston and have a guide and stop device limiting its axial travel.
  • the main air compression piston with which the rifle is provided additionally comprises a free auxiliary piston arranged in a chamber situated opposite the main compression cylinder, this auxiliary piston carrying a peripheral retaining seal which moves inside the cavity where it is housed, so that in the air compression phase, the main piston of the rifle produces the compression of the air, passing partly behind the auxiliary piston at the start of the loading maneuver, admitting a determined quantity of pressurized air which will remain there permanently retained, so that during the discharge cycle, it will push the auxiliary piston, completing the expansion action of the main air and obtaining a more efficient discharge of the weapon.
  • the seal of the auxiliary piston, arranged between the main and auxiliary chambers is of the leaktight type in both directions, that is to say that it does not allow passage of d air between said main and auxiliary chambers, a determined compression of the air having been provided beforehand in the auxiliary chamber.
  • This piston is essentially characterized by the fact that it internally comprises an auxiliary chamber 8 closed by a free auxiliary piston 9, which has a special retaining seal 10 which allows an easy passage of air towards the interior of the chamber, but which hinders his exit.
  • the auxiliary piston 9 is provided with a rod 12 provided with a stop collar 13 or any other member capable of supporting the axial force on the intermediate bearing 14 produced in the circular orifice of the piston 5.
  • the piston 5 when acting on the actuating lever of the weapon, the piston 5 is advanced to cause the compression of the air in the chamber 11, by increasing the air pressure, this gradually fills the auxiliary chamber 8 of the piston 5 deflecting the lip of the seal or sealing ring 10.
  • the auxiliary chamber 8 fills little with air at the start of the loading maneuver until the equilibrium pressure between the main air compression chamber 11 and the auxiliary chamber 8 is obtained.
  • the air contained in said auxiliary chamber remains stored permanently in said chamber.
  • the valve 4 is opened which allows the expulsion of the compressed air, so that the volume gained with the expansion is gradually compensated for by the auxiliary piston 9 and, therefore, the discharge pressure of the compressed air is kept constant.
  • the improvements, object of this patent provide for the presence of a main piston 16 inside the air compression cylinder 17, said piston being provided with '' a set of external seals 19 and 20, the front seal preferably being a seal and the rear seal a friction seal, in order to obtain a good seal in the sliding of the piston inside the cylinder 17 Said piston is connected to a conventional actuating rod 21.
  • the present improvements provide for the presence of a free free auxiliary piston 22 situated opposite the main piston 16 and provided with a rubber seal of particular shape 23, which constitutes a lip directed towards the rear, opposite of the main piston, sliding inside the cavity 24 where said auxiliary piston 22 is housed.
  • This piston has a large guide and stop collar capable of supporting the axial force on the intermediate bearing 26 which limits its axial displacement.
  • the cavity 27 in which the collar 25 is housed is closed at the rear using, for example, a cover 28 which presses on an elastic seal 29.
  • the main piston 16 also manages to support the axial force on the bearing 30 of the main cylinder.
  • a conduit 31 intended for the discharge of compressed air communicates with the chamber where the bullet intended to be projected by the barrel 18 of the armed.
  • the version shown in Figures 6 and 7 includes an auxiliary piston 32 which, in its intermediate groove 33, is provided with a seal system or seals, formed by a single seal 34 of symmetrical shape, with opposite contact lips 35 and 36, or a double seal formed by the two individual seals 37 and 38, coupled so that the corresponding peripheral lips 39 and 40 are divided in opposite directions.
  • the compensation chamber is subjected to a pre-determined pressure during assembly of the weapon.
  • the main piston 16 could be concave and the stop positions of the two pistons in their movement could be obtained by means of methods different from those indicated: one could for example have complementary springs of the two pistons.
  • the auxiliary piston could be located other than opposite the main piston.
  • the precise shape of the retaining seals and other seals could be modified without departing from the scope of the present invention.
  • the invention could be applied to any other type of airgun, such as pistols and rifles.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Toys (AREA)

Description

La présente invention concerne des perfectionnements apportés aux carabines à air comprimé et, plus particulièrement, au système de piston de compression de l'air dans la chambre destinée à son emmagasinage avant le moment du tir.The present invention relates to improvements made to air rifles and, more particularly, to the piston system for compressing the air in the chamber intended for its storage before the time of shooting.

Comme chacun sait, la carabines à air comprimé a trouvé de multiples applications dans le domaine du sport et du jouet. Le principe consiste essentiellement à apliquer une impulsion à une petite balle le long du canon; cette balle est projetée par une masse d'air préalablement comprimée, lors de la détente, entre en contact avec la zone dans laquelle se trouve la balle, dans l'âme du canon, de façon que l'énergie potentielle de l'air comprimé puisse agir sur ladite balle en la poussant le long du canon; l'énergie potentielle de l'air comprimé se transforme alors en énergie cinétiqque, celle de la balle à la sortie du canon, de sorte que selon l'ampleur de cette énergie cinétique, on obtient une portée plus ou moins grande du tir.As everyone knows, the air rifle has found multiple applications in the field of sports and toys. The principle consists essentially in applying an impulse to a small bullet along the barrel; this bullet is projected by a mass of air previously compressed, during the expansion, comes into contact with the zone in which the bullet is located, in the core of the barrel, so that the potential energy of the compressed air can act on said bullet by pushing it along the barrel; the potential energy of the compressed air is then transformed into kinetic energy, that of the bullet at the exit of the barrel, so that according to the amplitude of this kinetic energy, one obtains a more or less great range of the shooting.

Pour obtenir une plus grande précision de tir en même temps qu'une énergie potentielle accrue, on s'est aperçu qu'il suffisait que l'action de l'air comprimé sur la balle soit plus progressive qu'habituellement dans les dispositifs de décharge simple de l'air préalablement comprimé; ceux-ci se caractérisent par un fonctionnement très brusque qui, d'une part, a des effets négatifs sur la précision du tir et, d'autre part, réduit l'énergie potentielle qui est effectivement transférée à la balle.In order to obtain greater shooting accuracy as well as increased potential energy, it has been found that it is sufficient for the action of the compressed air on the bullet to be more gradual than usual in the discharge devices. simple previously compressed air; these are characterized by a very abrupt operation which, on the one hand, has negative effects on the accuracy of the shot and, on the other hand, reduces the potential energy which is actually transferred to the ball.

En conséquence, les perfectionnements objet de la présente invention visent essentiellement à obtenir une action plus progressive de l'air comprimé sur la balle dans l'espace parcouru par celle-ci le long du canon, de sorte que l'effort appliqué à la balle est plus uniforme et l'accélération plus constante; on obtient ainsi une meilleure utilisation de l'énergie potentielle de l'air comprimé et, donc, une nette amélioration de la puissance de tir ainsi que de sa précision.Consequently, the improvements which are the subject of the present invention essentially aim at obtaining a more progressive action of the compressed air on the bullet in the space traversed by it along the barrel, so that the force applied to the bullet is more uniform and the acceleration more constant; a better use of the potential energy of the compressed air is thus obtained and, therefore, a marked improvement in the firing power as well as its precision.

Les perfectionnements objet du présent brevet sont fondés essentiellement sur l'action conjuguée du piston principal d'impulsion de l'air de la carabine et d'un système compensateur pneumatique, de sorte que la décharge résulte de l'action à la fois du piston principal et du compensateur pneumatique.The improvements which are the subject of this patent are based essentially on the combined action of the main air impulse piston of the rifle and a pneumatic compensating system, so that the discharge results from the action of both the piston main and pneumatic compensator.

Selon un premier mode de réalisation de l'invention, les perfectionnements visant à obtenir lesdits objectifs sont fondés essentiellement sur la constitution d'un système de piston principal destiné à la compression de l'air, dans lequel ledit piston possède intérieurement une chambre auxiliaire fermée par un piston auxiliaire libre, celui-ci possédant un joint de retenue spécial qui permet un passage d'air de façon à obtenir l'équilibre des pressions entre la chambre principale d'air comprimé et ladite chambre auxiliaire; ainsi, une fois le chargement de l'arme effectué, c'est-à-dire une fois que l'air destiné à la projection aura été dûment comprimé, il 'établit un équilibre de pressions entre la chambre principale d'air comprimé et ladite chambre auxiliaire séparées par le piston auxiliaire libre, de sorte qu'au moment du tir, la transmission d'énergie de l'air comprimé se fera de façon plus progressive, ce qui est l'objectif recherché.According to a first embodiment of the invention, the improvements aimed at obtaining said objectives are essentially based on the constitution of a main piston system intended for the compression of air, in which said piston has internally a closed auxiliary chamber by a free auxiliary piston, the latter having a special retaining seal which allows an air passage so as to obtain the pressure balance between the main compressed air chamber and said auxiliary chamber; thus, once the loading of the weapon carried out, that is to say once the air intended for the projection will have been duly compressed, it 'establishes a balance of pressures between the main chamber of compressed air and said auxiliary chamber separated by the free auxiliary piston, so that at the time of firing, the transmission of energy from the compressed air will be more progressive, which is the objective sought.

Ce premier mode de réalisation prévoit essentiellement la constitution du piston auxiliaire à l'aide d'un dispositif formé par une tige pourvue, à une extrémité, d'une tête circulaire faisant précisément office de piston avec un organe de »retenue« ajusté et, à l'autre extrémité, une butée ou tout autre organe d'arrêt destiné à limiter la position axiale d'avance de l'ensemble piston. Cependant, la réalisation du piston auxiliaire pourra varier dans de larges limites à une seule condition, laquelle doit être remplie dans tous les cas: il doit être disposé de façon à coulisser à l'intérieur d'une chambre ou logements du piston principal et posséder un dispositif de guidage et de butée limitant sa course axiale.This first embodiment essentially provides for the constitution of the auxiliary piston using a device formed by a rod provided, at one end, with a circular head precisely serving as a piston with an adjusted "retaining" member and, at the other end, a stop or any other stop member intended to limit the axial position of advance of the piston assembly. However, the production of the auxiliary piston may vary within wide limits with only one condition, which must be fulfilled in all cases: it must be arranged so as to slide inside a chamber or housings of the main piston and have a guide and stop device limiting its axial travel.

Selon un autre mode de réalisation de l'invention, plus perfectionné, le piston principal de compression de l'air dont est dotée la carabine comporte en complément un piston auxiliaire libre disposé dans une chambre située à l'opposé du cylindre de compression principal, ce piston auxiliaire étant porteur d'un joint de retenue périphérique qui se meut à l'intérieur de la cavité où il est logé, de sorte qu'en phase de compression de l'air, le piston principal de la carabine produit la compression de l'air, passant en partie derrière le piston auxiliaire au début de manoeuvre de chargement, admettant une quantité déterminée d'air sous pression qui y restera retenu de façon permanente, de sorte que durant le cycle de décharge, il poussera le piston auxiliaire, complétant l'action d'expansion de l'air principal et obtenant une décharge plus efficace de l'arme.According to another, more improved embodiment of the invention, the main air compression piston with which the rifle is provided additionally comprises a free auxiliary piston arranged in a chamber situated opposite the main compression cylinder, this auxiliary piston carrying a peripheral retaining seal which moves inside the cavity where it is housed, so that in the air compression phase, the main piston of the rifle produces the compression of the air, passing partly behind the auxiliary piston at the start of the loading maneuver, admitting a determined quantity of pressurized air which will remain there permanently retained, so that during the discharge cycle, it will push the auxiliary piston, completing the expansion action of the main air and obtaining a more efficient discharge of the weapon.

Selon un troisième mode de réalisation de l'invention, le joint du piston auxiliaire, disposé entre les chambres principale et auxiliaire, est de type étanche dans les deux sens, c'est-à-dire qu'il ne permet pas de passage d'air entre lesdites chambres principale et auxiliaire, une compression déterminée de l'air ayant été prévue au préalable dans la chambre auxiliaire.According to a third embodiment of the invention, the seal of the auxiliary piston, arranged between the main and auxiliary chambers, is of the leaktight type in both directions, that is to say that it does not allow passage of d air between said main and auxiliary chambers, a determined compression of the air having been provided beforehand in the auxiliary chamber.

Ceci peut être obtenu en disposant, par exemple, entre lesdites chambres principale et auxiliaire un joint à double lèvre ou deux joints opposés.This can be achieved by having, for example, between said main and auxiliary chambers a double lip seal or two opposite seals.

A titre d'exemple et pour une meilleure compréhension de l'invention, le dessin ci-joint illustre les perfectionnements, objet du présent brevet.

  • Les figures 1, 2 et 3 représentent chacune une coupe longitudinale d'un ensemble cylindre-piston selon une première version de l'invention et, respectivement, en position de piston chargé et prêt à tirer, en position de repos après le tir et en position avant la compression de l'air dans le cylindre.
  • La figure 4 représente une coupe longitudinale d'une deuxième version de l'invention permettant d'apprécier la disposition du piston principal et du piston auxiliaire de l'arme, ainsi que le passage de déchargement.
  • La figure 5 représente une vue en coupe semblable à celle de la figure 4, dans laquelle le piston principal de l'arme se trouve en position de chargement avant la compression de l'air.
  • Les figures 6 et 7 représentent des vues en coupe du piston auxiliaire selon une troisième version et pourvu respectivement de deux joints opposés et d'un joint à double lèvre.
By way of example and for a better understanding of the invention, the attached drawing illustrates the improvements which are the subject of this patent.
  • Figures 1, 2 and 3 each show a longitudinal section of a cylinder-piston assembly according to a first version of the invention and, respectively, in the loaded piston position and ready to fire, in the rest position after firing and in position before air compression in the cylinder.
  • Figure 4 shows a longitudinal section of a second version of the invention for assessing the arrangement of the main piston and the auxiliary piston of the weapon, as well as the unloading passage.
  • 5 shows a sectional view similar to that of Figure 4, in which the main piston of the weapon is in the loading position before the air compression.
  • Figures 6 and 7 show sectional views of the auxiliary piston according to a third version and respectively provided with two opposite seals and a double lip seal.

Tel qu'il apparaît sur les croquis, l'ensemble des organes concernés par les présents perfectionnements se compose essentiellement d'un cylindre 1 limité dans sa partie avant 2 par un conduit 3 fermé au moyen d'une soupape 4 et dans sa partie arrière par un piston 5 pourvu d'anneaux d'étanchéité 6 et de coulissement 7.As it appears on the sketches, all the bodies concerned by the present improvements essentially consist of a cylinder 1 limited in its front part 2 by a conduit 3 closed by means of a valve 4 and in its rear part by a piston 5 provided with sealing rings 6 and sliding rings 7.

Ce piston se caractérise essentiellement par le fait qu'il comporte intérieurement une chambre auxiliaire 8 obturée par un piston auxiliaire libre 9, lequel possède un joint de retenue spécial 10 qui permet un passage d'air aisé vers l'intérieur de la chambre, mais qui gêne sa sortie.This piston is essentially characterized by the fact that it internally comprises an auxiliary chamber 8 closed by a free auxiliary piston 9, which has a special retaining seal 10 which allows an easy passage of air towards the interior of the chamber, but which hinders his exit.

Le piston auxiliaire 9 est doté d'une tige 12 pourvue d'un collet d'arrêt 13 ou tout autre organe susceptible de supporter l'effort axial sur le palier intermédiaire 14 réalisé dans l'orifice circulaire du piston 5.The auxiliary piston 9 is provided with a rod 12 provided with a stop collar 13 or any other member capable of supporting the axial force on the intermediate bearing 14 produced in the circular orifice of the piston 5.

Grâce à ce dispositif, lorsqu'en agissant sur le levier d'actionnement de l'arme, on fait avancer le piston 5 pour provoquer la compression de l'air de la chambre 11, en augmentant la pression de l'air, celui-ci remplit peu à peu la chambre auxiliaire 8 du piston 5 déviant la lèvre du joint ou anneau d'étanchéité 10.With this device, when acting on the actuating lever of the weapon, the piston 5 is advanced to cause the compression of the air in the chamber 11, by increasing the air pressure, this gradually fills the auxiliary chamber 8 of the piston 5 deflecting the lip of the seal or sealing ring 10.

La chambre auxiliaire 8 se remplit peu à pen d'air en début de manoeuvre de chargement jusqu'à ce que soit obtenue la pression d'équilibre entre la chambre principale de compression d'air 11 et la chambre auxiliaire 8. L'air contenu dans ladite chambre auxiliaire reste emmagasiné de façon permanente dans ladite chambre.The auxiliary chamber 8 fills little with air at the start of the loading maneuver until the equilibrium pressure between the main air compression chamber 11 and the auxiliary chamber 8 is obtained. The air contained in said auxiliary chamber remains stored permanently in said chamber.

En conséquence, lorsque le piston 5 arrive au bout de son parcours de compression à l'intérieur du cylindre 1, figure 1, il se forme une chambre d'air 15 à la même pression que l'air de la chambre auxiliaire 8.Consequently, when the piston 5 reaches the end of its compression path inside the cylinder 1, FIG. 1, an air chamber 15 is formed at the same pressure as the air in the auxiliary chamber 8.

Au moment du tir, représenté sur la figure 2, on ouvre la soupape 4 qui permet l'expulsion de l'air comprimé, de telle sorte que le volume gagné avec l'expansion est compensé au fur et à mesure par le piston auxiliaire 9 et, de ce fait, la pression de décharge de l'air comprimé se maintient constante.At the time of the firing, represented in FIG. 2, the valve 4 is opened which allows the expulsion of the compressed air, so that the volume gained with the expansion is gradually compensated for by the auxiliary piston 9 and, therefore, the discharge pressure of the compressed air is kept constant.

Tel qu'il apparaît selon la version des figures 4 et 5, les perfectionnements, objet du présent brevet, prévoient la présence d'un piston principal 16 à l'intérieur du cylindre de compression de l'air 17, ledit piston étant pourvu d'un jeu de joints externes 19 et 20, le joint avant étant de préférence un joint d'étanchéité et celui arrière un joint de friction, et ce afin d'obtenir une bonne étanchéité dans le coulissement du piston à l'intérieur du cylindre 17. Ledit piston est connecté à une baguette d'actionnement conventionnel 21.As it appears according to the version of Figures 4 and 5, the improvements, object of this patent, provide for the presence of a main piston 16 inside the air compression cylinder 17, said piston being provided with '' a set of external seals 19 and 20, the front seal preferably being a seal and the rear seal a friction seal, in order to obtain a good seal in the sliding of the piston inside the cylinder 17 Said piston is connected to a conventional actuating rod 21.

Les présents perfectionnements prévoient la présence d'un piston auxiliaire libre libre 22 situé à l'opposé du piston principal 16 et pourvu d'un joint en caoutchouc de forme particulière 23, qui constitue une lèvre dirigée vers l'arrière, à l'opposé du piston principal, coulissant à l'intérieur de la cavité 24 où est logé ledit piston auxiliaire 22. Ce piston est doté d'un large collet de guidage et d'arrêt, susceptible de supporter l'effort axial sur le palier intermédiaire 26 qui limite son déplacement axial. La cavité 27 où est logé le collet 25 est fermée à l'arrière à l'aide, par exemple, d'un couvercle 28 qui fait pression sur un joint élastique d'étanchéité 29.The present improvements provide for the presence of a free free auxiliary piston 22 situated opposite the main piston 16 and provided with a rubber seal of particular shape 23, which constitutes a lip directed towards the rear, opposite of the main piston, sliding inside the cavity 24 where said auxiliary piston 22 is housed. This piston has a large guide and stop collar capable of supporting the axial force on the intermediate bearing 26 which limits its axial displacement. The cavity 27 in which the collar 25 is housed is closed at the rear using, for example, a cover 28 which presses on an elastic seal 29.

Le piston principal 16 parvient également à supporter l'effort axial sur le palier 30 du cylindre principal.The main piston 16 also manages to support the axial force on the bearing 30 of the main cylinder.

Dans la zone intermédiaire entre les deux positions d'arrêt des deux pistons composant le système, un conduit 31 destimé à la décharge de l'air comprimé communique avec la chambre où se trouvera la balle destinée à être projetée par le canon 18 de l'arme.In the intermediate zone between the two stop positions of the two pistons making up the system, a conduit 31 intended for the discharge of compressed air communicates with the chamber where the bullet intended to be projected by the barrel 18 of the armed.

Grâce à ce dispositif, on obtient le fonctionnement suivant: lorsque le piston se déplace dans son parcours de chargement, de sa position extrême (figure 5) vers la position d'arrêt, tel qu'il apparaît dans la figure 4, l'air emmagasiné à l'intérieur du cylindre 17 est comprimé, prêt à appliquer une impulsion à la petite balle. Lors de la décharge, l'air passe vers le canon au moyen du conduit 31, l'impulsion étant due tant à l'action du piston principal qu'à l'expansion de l'air de la chambre 27 sur le piston 22, ce qui constitue une action supplémentaire de compression de l'air en phase de décharge, rendant celle-ci plus régulière et effective.With this device, the following operation is obtained: when the piston moves in its loading path, from its extreme position (Figure 5) to the stop position, as it appears in Figure 4, the air stored inside the cylinder 17 is compressed, ready to apply an impulse to the small ball. During the discharge, the air passes to the barrel by means of the conduit 31, the impulse being due both to the action of the main piston and to the expansion of the air in the chamber 27 on the piston 22, which constitutes an additional action of compression of the air during the discharge phase, making it more regular and effective.

La version représentée sur les figures 6 et 7 comporte un piston auxiliaire 32 qui, dans sa gorge intermédiaire 33, est doté d'un système de joint ou joints étanches, formé par un joint unique 34 de forme symétrique, avec des lèvres de contact opposées 35 et 36, ou un double joint formé par les deux joints individuels 37 et 38, accouplés de façon à ce que les lèvres périphériques correspondantes 39 et 40 soient divisées en sens contraire. Grâce à quoi, la chambre de compensation est soumise à une pression préalable déterminée durant le montage de l'arme.The version shown in Figures 6 and 7 includes an auxiliary piston 32 which, in its intermediate groove 33, is provided with a seal system or seals, formed by a single seal 34 of symmetrical shape, with opposite contact lips 35 and 36, or a double seal formed by the two individual seals 37 and 38, coupled so that the corresponding peripheral lips 39 and 40 are divided in opposite directions. As a result, the compensation chamber is subjected to a pre-determined pressure during assembly of the weapon.

Bien entendu, diverses variantes peuvent être imaginées, sans pour autant sortir du domaine de l'invention. En particulier, le piston principal 16 pourrait être concave et les positions d'arrêt des deux pistons dans leur déplacement pourraient être obtenues au moyen de procédés différents de ceux indiqués: l'on pourrait par exemple disposer des ressorts complémentaires des deux pistons. Dans ce cas, le piston auxiliaire pourrait être situé autrement qu'à l'opposé du piston principal, De même, la forme précise des joints de retenue et autres joints pourrait être modifiée sans sortir du domaine de la présente invention. Egalement, l'invention pourrait s'appliquer à tout autre type d'armes à air comprimé, tels que les pistolets et carabines.Of course, various variants can be imagined, without however departing from the scope of the invention. In particular, the main piston 16 could be concave and the stop positions of the two pistons in their movement could be obtained by means of methods different from those indicated: one could for example have complementary springs of the two pistons. In this case, the auxiliary piston could be located other than opposite the main piston. Similarly, the precise shape of the retaining seals and other seals could be modified without departing from the scope of the present invention. Also, the invention could be applied to any other type of airgun, such as pistols and rifles.

Claims (8)

1. An air gun, including an auxiliary pneumatic chamber (8, 27) associated with the principal chamber (15, 31) in which the compression of the air takes place under the action of the principal piston, (5, 16) of the gun, characterized in that the said auxiliary chamber (8, 27) includes a free-running auxiliary piston (12; 32, 22) capable of sliding within the auxiliary chamber in an air-tight manner, at least in the direction going from the auxiliary chamber (8, 27) to the principal chamber (15, 31), and establishing an air chamber (8, 27) separate from the principal compression chamber of the gun and able to receive and transmit via the intermediary of the free-running auxiliary piston the variations of pressure relative to the principal chamber.
2. The air gun according to claim 1, characterized in that the said auxiliary chamber (8) is situated inside the principal air compression piston (5) of the gun, this auxiliary chamber (8) being separated from the principal air compression chamber (15) by an auxiliary piston (12) which slides adapted to the interior surface of the auxiliary chamber (8) and which, in the compression phase, permits the rapid transfer of the compressed air between the principal chamber (15) and the auxiliary chamber (8), and which, in the firing phase, regulates and renders the action of the compressed air on the projectile to be fired, more progessive.
3. The air gun according to claim 2, characterized in that the free-running auxiliary piston (12) which separates the principal compression chamber (15) from the auxiliary chamber (8) bears a peripheral retention seal which allows easy passage of compressed air from the principal chamber (15) to the auxiliary chamber (8) in the firing phase.
4. The air gun according to claim 1, characterized in that the auxiliary chamber (27) containing the free-running auxiliary piston (22) is situated in a fixed position at one end of the principal air compression chamber (17), the auxiliary piston bearing a flexible air-tight seal fitted to the interior of the said complementary chamber.
5. The air gun according to claim 4, characterized in that the principal and auxiliary air compression chambers posses barriers (30; 14, 26) limiting the axial displacement of the principal piston (5, 16) as well as the auxiliary piston (12, 32, 22).
6. The air gun according to claim 4, characterized in that the compressed air discharge conduit (31) ends in a zone intermediary between the piston (16,22) of principal and auxiliary chamber.
7. The air gun according to claim 1, characterized in that the air-tightness of the auxiliary chamber is obtained by the fit of a double- flanged (35, 36; 39, 40) retention system (34; 37, 38) at the periphery of the auxiliary piston (32).
8. The air gun according to claim 7, characterized in that the auxiliary chamber is previously submitted to an air pressure of a determined value.
EP82109226A 1981-10-07 1982-10-06 Air gun Expired EP0076520B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82109226T ATE14628T1 (en) 1981-10-07 1982-10-06 AIR RIFLE.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ES506667A ES8306867A1 (en) 1981-10-07 1981-10-07 Air gun
ES506667 1981-10-07
ES513092A ES513092A0 (en) 1982-05-19 1982-05-19 "IMPROVEMENT IN COMPRESSED AIR CARABINES".
ES513092 1982-05-19

Publications (2)

Publication Number Publication Date
EP0076520A1 EP0076520A1 (en) 1983-04-13
EP0076520B1 true EP0076520B1 (en) 1985-07-31

Family

ID=26156026

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109226A Expired EP0076520B1 (en) 1981-10-07 1982-10-06 Air gun

Country Status (4)

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US (1) US4572152A (en)
EP (1) EP0076520B1 (en)
BR (1) BR8205887A (en)
DE (1) DE3265094D1 (en)

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GB8527729D0 (en) * 1985-11-11 1985-12-18 Ford J B M Airgun
RU2003367C1 (en) * 1992-09-23 1993-11-30 Товарищество с ограниченной ответственностью "Иста" Device for throwing rescue ropes
US5570676A (en) * 1994-02-04 1996-11-05 Gore; Thomas D. Method for converting a mechanical spring gun to a pneumatic spring gun and the resulting pneumatic spring gun
US6581585B2 (en) * 2001-11-16 2003-06-24 Alfred F. Nibecker, Jr. Air gun
US7520275B2 (en) * 2005-10-22 2009-04-21 Long Robert M Valve assembly for paintball guns and the like, and improved guns incorporating the assembly
US20090084371A1 (en) * 2007-10-01 2009-04-02 Nibecker Jr Alfred F Pneumatic device
IT1393467B1 (en) * 2009-03-09 2012-04-20 V R V S R L COMPACT DEVICE FOR RECHARGING AIR TANKS, PARTICULARLY FOR COMPRESSED AIR WEAPONS.
US8322329B1 (en) 2010-01-06 2012-12-04 Long Range, Llc Systems, devices, and/or methods for launching a projectile
US9562738B2 (en) * 2013-05-10 2017-02-07 Crosman Corporation Split compression piston

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DE1553929A1 (en) * 1966-10-24 1971-01-21 Anschuetz Gmbh J G Compressed air gun with rigid barrel

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DE1553929A1 (en) * 1966-10-24 1971-01-21 Anschuetz Gmbh J G Compressed air gun with rigid barrel

Also Published As

Publication number Publication date
DE3265094D1 (en) 1985-09-05
EP0076520A1 (en) 1983-04-13
US4572152A (en) 1986-02-25
BR8205887A (en) 1983-09-06

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