EP0041034A1 - Delivery system for a pressurized gas reservoir such as a cartridge - Google Patents

Abstract

1. A system for extracting from a pressurised gas container such as an interchangeable cartridge (2) forming a non-returnable packing, of the type comprising : - a receptacle (1) intended to contain at least part of the cartridge (2) and provided on its upper part with a thread (1c, 1d) ; - a flange (8) intended to be placed on the said receptacle (1) and provided on its lower part with a thread (8a) complementary to the thread (1c, 1d) of the receptacle (1) ; - an annular tightening means (5b) intended to be applied in a tight manner against the central part of the upper wall of the cartridge (2) ; - a gas extracting head (5) fixed to the centre of the flange (8) on the axis of the latter and comprising an axial means for the perforation of the cartridge on the interior of the tightening means (5b), characterised in that the receptacle (1) comprises two shells (1a, 1b) articulated one in relation to the other, and in that the threads of the receptacle (1) and of the flange (8) are arranged respectively on the exterior and on the interior.

Description

The present invention relates to improvements made to gas sampling systems from a pressurized gas tank such as an interchangeable cartridge forming a lost package.

• - un pot cylindrique destiné à contenir la cartouche et pourvu à sa partie haute d'un filetage intérieur ;
• - un habillage affectant en section axiale la forme d'un H, c'est-à-dire en gros composé par deux alvéoles, l'un supérieur ouvert vers le haut et l'autre (ou collerette) inférieur ouvert vers le bas, séparés par un voile transversal ; cet habillage peut être mis en place sur le pot, grâce à la collerette pourvue à sa partie basse d'un filetage extérieur complémentaire au filetage dudit pot ;
• - une tête de prélèvement de gaz fixée axialement au centre de la collerette, sur le voile transversal, et comprenant un moyen axial de perforation de la cartouche ;
• - un moyen ou joint annulaire d'étanchéité, faisant partie de la tête de prélèvement de gaz, porté par un piston repoussé par un ressort, la perforation s'exerçant à l'intérieur du joint d'étanchéité.

French patent 72 42964 discloses, in the name of the present Applicant, a collection system of the aforementioned type, comprising:

• - a cylindrical pot intended to contain the cartridge and provided at its upper part with an internal thread;
• - a covering affecting in axial section the shape of an H, that is to say roughly composed of two cells, one upper open upwards and the other (or flange) lower open downwards, separated by a transverse veil; this covering can be placed on the pot, thanks to the collar provided at its lower part with an external thread complementary to the thread of said pot;
• - A gas sampling head fixed axially to the center of the flange, on the transverse web, and comprising an axial means of perforating the cartridge;
• - A means or annular seal, part of the gas sampling head, carried by a piston pushed by a spring, the perforation being exerted inside the seal.

• - le pot cylindrique et l'habillage étant initialement séparés, on place dans le pot une cartouche, le serti inférieur de cette dernière reposant sur le fond du pot ;
• - puis on visse l'habillage ou plus précisément sa collerette, sur le pot ;
• - dès cet instant, on rapproche la tête de prélèvement de gaz de la cartouche, et successivement le joint annulaire d'étanchéité entre en contact avec la capsule centrale de la cartouche, le piston se rétracte à l'intérieur de la tête de prélèvement de gaz, et finalement le moyen de perforation choisi perfore la cartouche à l'intérieur du joint d'étanchéité.

The previously described sampling system works as follows:

• - the cylindrical pot and the covering being initially separated, a cartridge is placed in the pot, the lower setting of the latter resting on the bottom of the pot;
• - Then we screw the covering or more precisely its collar, on the pot;
• - from this moment, the gas sampling head is brought closer to the cartridge, and successively the annular seal comes into contact with the central capsule of the cartridge, the piston retracts inside the gas sampling head, and finally the chosen perforation means punctures the cartridge inside the seal.

Regarding the gas sampling mode in the cartridge, from the above it will be observed that it is strictly identical to that described in its time in French patent 1,133,075, except that according to the patent French 72 42964 the screwing of the gas sampling head with respect to the cartridge is carried out indirectly, by means of the covering or the collar.

In French patent 77 24136 of 07.29.77 in the name of the Applicant, a technical solution has been proposed which improves in certain extreme circumstances the security of a sampling system in accordance with patent 1 133 075, and which consists in providing on the one hand at least three male elements, for example bosses on the support of the cartridge, which are angularly distributed regularly around the axis of the system, and on the other hand at least three corresponding female elements, receiving the male elements, for example notches on the cartridge, which are also regularly distributed around the axis of the system.

Given the quasi-identity in their principles of the sampling system according to French patent 1,133,075 and that according to French patent 7242964, the Applicant sought to apply the technical solution described in French patent 77 24136 to a system of sample with screwable pot. She then encountered the following difficulties.

Firstly, it does not appear possible to arrange the bosses on the inner face of the screwable pot, because then these prevent the introduction from the top of the cartridge.

Secondly, these bosses cannot be placed on the inside of the flange since in this case, if the cartridge can be effectively introduced into the pot and then into the collar, the screwing of the latter does not cause any relative rotation of the gas sampling head relative to the cartridge. Under these conditions, the various technical effects of the solution in accordance with French patent 77 24136 cannot be obtained.

Thirdly, one can consider introducing the notched cartridge from the bottom of the screwable pot, thanks to a removable lower cover provided on the latter. But this solution significantly complicates the screwable pot, and in a way destroys the simplicity of fitting the cartridge provided by the solution of French patent 72 42964.

In total, no solution appears a priori satisfactory to undo the teaching of the French patent 77 24136 to the sampling systems conforming to the French patent 72 42964.

• - prévoir un pot vissable comportant les bossages en question sous la forme de deux coques articulées l'une par rapport à l'autre.
• - disposer les filetages du pot et de la collerette respectivement à l'extérieur et à l'intérieur.

The present invention nevertheless makes it possible to overcome the aforementioned drawbacks and consists in:

• - Provide a screwable pot with the bosses in question in the form of two hulls hinged relative to each other.
• - arrange the threads of the pot and the flange respectively outside and inside.

According to a preferred embodiment of the above arrangement, the pot is made by molding a suitable plastic material such as polypropylene to allow the formation of a one-piece hinge between the diametrical edges of the bottoms of the two shells.

• Fig. 1 est une coupe longitudinale d'un appareil à gaz sous pression comportant application des perfectionnements suivant l'invention.
• Fig. 2 et 3 illustrent respectivement en vue extérieure partielle et en coupe les deux coques du pot dans la position de moulage.

The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:

• Fig. 1 is a longitudinal section of a pressurized gas appliance comprising the application of improvements according to the invention.
• Fig. 2 and 3 respectively illustrate in partial exterior view and in section the two shells of the pot in the molding position.

Partially shown in section in FIG. 1 an apparatus produced in accordance with the invention and which essentially comprises two elements, namely a pot 1 containing a cartridge 2 and a covering 3 produced in cross section in the form of an H in accordance with what is described in French patent 72 42964 of the present Applicant. This covering 3 advantageously but not exclusively made from a molded plastic material has a transverse veil 4, the center of which receives a gas intake head 5 secured to a portable device (not shown) operating with liquefied gas under pressure such as butane gas. , the sampling being carried out from the cartridge 2 as has been described for the first time in French patent 1 133075. It is observed that the head 5 passes through a smooth hole 4a of the web 4 and that it is provided with a lateral tab 5a immobilized with respect to said veil by means of a screw 6. As indicated above the transverse veil 4 divides the covering 3 into two cells, the upper one 7 which at least partially encloses the device connected to the head of gas outlet 5 and a lower cell 8 produced in the form of a cylindrical flange, the inner face of which is provided with a thread 8a.

• - le filetage de la collerette qui était prévu sur l'extérieur de l'alvéole inférieur de l'habillage dans le brevet antérieur est remplacé suivant l'invention par un taraudage sur la face intérieure de la collerette du même alvéole.

Note the complete resemblance of the covering 3 with that described in patent 72 42964 of the present Applicant. However, there is a fundamental difference:

• - The thread of the collar which was provided on the outside of the lower cell of the covering in the previous patent is replaced according to the invention by a thread on the inner face of the collar of the same cell.

The pot 1 is produced advantageously but not exclusively by pressure molding, and preferably by injection of a plastic material such as polypropylene. As illustrated in fig. 2 and 3 it comprises two shells la and lb each having the shape of a hollow half-cylinder and which are joined at the edge of their semi-circular bottom by a radial hinge 9. Since the pot 1 is made of polypropylene, to establish the hinge 9 it is sufficient to provide at this level a thinning of the thickness of the bottoms. It is observed that this hinge does not extend over the total length of the diameter of the pot but only over approximately 2/3 of the value of this diameter. The outer face of each of the bottom of the shells 1a, 16 has radial ribs 10, 11 suitable for forming feet by means of which the pot rests on the work surface. When the two shells are folded from their position in fig. 2 and 3 to bring them into that of fig. 1, the peripheral rim of the cartridge 2 rests on a shoulder corresponding to the jar 1. Each shell la, lb is provided at its free end with a thread lc, ld, which is continuous when the shells la and lb are folded back l 'against each other in a joined manner. It will be noted according to the invention that the pot was produced by means of two hulls articulated at their bottom so that, starting from the unfolded position of FIG. 2 and 3 we can bring these shells against each other by rotating them around the hinge 9 so that they come to trap a cartridge 2 disposed between them and that they ensure its centering. Thus once the shells rest against the cartridge, the pot 1 is basically reconstituted as if it were made in one piece, its cross section being perfectly circular at its opening so that the two threads lc, ld n 'form only one complementary to the thread 8a of the flange 8.

It is easy to understand that it suffices to screw the pot 1 relative to the thread 8a of the lower cell or flange of this covering to first cause the support of a seal 5b belonging to the grip head. gas 5, then the perforation of the central cup of the cartridge 2 by means of an appropriate member placed concentrically with the interior of the seal 5b as is already known.

When dealing with cartridges 2 provided with peripheral depressions 2a or notches established in accordance with French patent 77 24136 of the present Applicant, the inner face of each of the shells has projections or bosses 12 capable of engaging in the depressions considered so as to angularly immobilize the cartridge 2 relative to the pot 1. Thus when we screw it on the flange 8 we are assured of a relative angular movement between the central cup above the cartridge of a on the one hand, and the gasket 5b on the other hand, in accordance with the principle explained in French patent 77 24136.

In an advantageous embodiment, the assembly constituted by the two shells comprises at least three projections 12 distributed angularly in a regular manner around the axis of the pot, while the cartridge is provided with at least three corresponding depressions 2a distributed by same way around its axis.

It should moreover be understood that the foregoing description has been given only by way of example and that it in no way limits the field of the invention from which one would not depart by replacing the details of execution described by all other equivalents.

Claims (4)

1. Sampling system from a gas tank. under pressure such as an interchangeable cartridge forming a lost package, of the type comprising: - A pot intended to contain at least partially the cartridge and provided at its upper part with a thread '; - A flange intended to be placed on said pot provided at its lower part with a thread complementary to the thread of the pot; - An annular sealing means, intended to be applied sealingly against the central part of the upper wall of the cartridge; - a gas sampling head, fixed in the center of the collar, in the axis of the latter and comprising an axial means of perforating the cartridge inside the sealing means, characterized in that the pot (1 ) has two shells (la, lb) articulated with respect to each other, and in that the threads of the pot (1) and the flange (8) are disposed respectively outside and inside . 2. System according to claim 1, characterized in that the two shells (la, lb) are articulated around the same horizontal axis located in the lower part of the tank. 3. System according to claim 1, characterized in that, in a manner known per se, the two shells comprise at least three male elements (12) distributed angularly in a regular manner around the axis of said pot (1), which male elements (12) are intended to engage in at least three corresponding female elements (2a), angularly distributed evenly around the axis of a cartridge (2). 4. Combustion apparatus for a combustible gas, characterized in that it comprises a system according to any one of the preceding claims.

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