FR2484601A1 - IMPROVEMENTS IN SAMPLING SYSTEMS FROM A PRESSURE GAS TANK, SUCH AS A CARTRIDGE - Google Patents

Abstract

THE POT 1 CONTAINING THE CARTRIDGE 2 IS MADE IN THE FORM OF TWO SHELLS 1A, 1B ARTICULATED AROUND A DIAMETRAL HINGE 9 LOCATED BETWEEN THE SEMI-CIRCULAR BOTTOMS OF THESE TWO SHELLS. ONCE THESE ARE FOLDED AGAINST THE CARTRIDGE 2, THIS LATTER IS CENTERED IN RELATION TO THE CLADDING 3 CARRYING THE GAS SOCKET HEAD 5. COMBUSTION APPARATUS OF A COMBUSTIBLE GAS.

Description

The present invention relates to improvements made to the

  gas sampling systems from a gas tank

  pressure such as an interchangeable cartridge forming lost packaging.

  French patent 72 42964 in the name of the present Applicant discloses a sampling system of the above kind, comprising; - a cylindrical pot for containing the cartridge and provided at its upper part with an internal thread - a cladding affecting in axial section the form of an A, that is to say roughly composed of two cells, the one upper open up and the other lower (or collar) open downward, separated by a transverse web; this covering can be put in place 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 in the center of the collar, on the transverse web, and comprising an axial means for perforating the cartridge - an annular sealing means or seal forming part of the gas sampling head carried by a spring-biased piston,

  perforation inside the seal.

  The previously described sampling system works from the

following way: -

  - The cylindrical pot and dressing being initially separated, is placed in the pot a cartridge, the lower set of the latter resting on the bottom of the pot - then we screw the dressing, 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 sealing gasket comes into contact with the central cup of the cartridge, the piston retracts inside the gas sampling head. , and finally the means of

  selected perforation punctures the cartridge inside the seal.

  Regarding the method of sampling gas in the cartridge, from the above it will be observed that it is strictly identical to that described in his time in the French patent 1,133,075, except that according to the patent French 72 42964 the screwing head of the gas sampling head relative to the cartridge is carried out indirectly, through the dressing or the flange. In the French patent 77 24136 of 29.07.77 in the name of the Applicant, it has been proposed a technical solution improving in certain extreme circumstances the safety of a sampling system according to the patent 1 133 075, and consisting 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, by example of the notches on the cartridge, who are they

  also regularly distributed around the axis of the system.

  Given the quasi-identity in their principles of the sampling system according to the French patent 1,133,075 and that according to the French patent 72,429,664, the Applicant sought to apply the solution.

  described in French patent 77 24136 to a system for sampling

  with screw pot. She then ran into the following difficulties.

  First, it does not appear possible to have the bosses on the inside of the screw pot, because then they prevent

  the introduction from the top of the cartridge.

  Second, we can not have these bosses on the inner face of the flange, since in this case, if the cartridge can be effectively introduced into the pot then into the flange, the screwing of the latter causes no relative rotation of the flange. gas sampling head with respect to the cartridge. In these circumstances, the different technical effects of the solution in accordance with the French patent

77 24136 can not be obtained.

  Thirdly, we can consider introducing the cartridge to

  by the bottom of the screwable pot, thanks to a removable bottom cover provided on it. But this solution significantly complicates the screw pot, and destroys somehow the simplicity of implementation of the

  cartridge brought by the solution of the French patent 72 42964.

  In total, no solution appears a priori satisfactory to deduct the teaching of the French patent 77 24136 to the systems of

  sampling according to the French patent 72 42964.

  The present invention nevertheless makes it possible to obviate the abovementioned disadvantages and consists in providing a screwable pot comprising the bosses in question.

  in the form of two hulls articulated with respect to each other.

  - arrange the threads of the pot and the collar respectively

outside and inside.

  According to a preferred embodiment of the arrangement that precedes the pot is made by molding a suitable plastic material such as polypropylene to allow the constitution of a hinge

  monoblock between the diametrical ridges of the bottoms of the two hulls.

  The attached drawing, given as an example, will better

  take the invention, the characteristics it presents and the advantages

  which it is likely to procure: 1 is a longitudinal section of a gas appliance under

  pressure comprising applying improvements according to the invention.

  Fig. 2 and 3 respectively illustrate in external view par-

  tielle and cut the two hulls of the pot in the molding position.

  Partially shown in section in FIG. 1 an apparatus made according to the invention and which comprises essentially two elements, a pot 1 containing a cartridge 2 and a covering 3 made in cross section in the form of an H in accordance with what is described in the French patent 72 42964 of the present Applicant. This casing 3 advantageously but not exclusively made of a molded plastic material has a transverse web 4 whose center receives a head of

  gas intake 5 secured to a portable device (not shown) operates

  liquefied gas under pressure such as butane gas,

  This is done for the first time in the French patent 1,133,075. 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 lug 5a immobilized with respect to said web by means of a screw 6. As indicated above, the transverse web 4 divides the skin 3 in two cells one upper 7 which at least partially encloses the apparatus connected to the gas intake head 5 and a lower cell 8 formed in the form of a cylindrical flange whose inner face

is provided with a thread 8a.

  Note the complete resemblance of the dressing 3 with that described in the patent 72 42964 of the present Applicant. It is necessary

  however, observe a fundamental difference: the threading of the

  te which was provided on the outside of the lower flange of the cladding in the prior patent is replaced according to the invention by a tapping

  on the inside of the collar of the same cell.

  The pot 1 is advantageously but not exclusively produced by molding under pressure, 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 semicircular 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 funds. It is observed that this hinge does not extend over the total length of the diameter of the pot but only about 2/3 of the value of this diameter. The outer face of each of the fund-shells la, lb comprises radial ribs 10, It suitable for forming feet through which the pot rests on the work plan. When the two hulls are folded from their position of fig. 2 and 3 to bring them into that of fig. 1, the peripheral rim of the cartridge 2 rests on a corresponding shoulder 1a of the pot 1. Each shell 1a, 1b is provided at its free end with a thread 1a, 1d, which is continuous when the shells 1a and 1b are folded. against each other in a contiguous manner. It will be noted according to the invention that the pot was made by means of two shells articulated at their bottom so that starting from the unfolded position of FIG. 2 and 3 we can bring these hulls against each other by rotating them around the hinge 9 so that they come to imprison

  a cartridge 2 arranged between them and that they ensure its centering.

  Thus, once the shells bear against the cartridge, the pot 1 is reconstituted as if it were made in one piece, its cross section being perfectly circular at its opening, so that the two threads 1a, 1d enformen-Xu'one complementary to the

tapping 8a of the flange 8.

  It is easily understood that it is sufficient to screw the pot 1 relative to the thread 8a of the lower recess or flange of this covering to cause the support of a seal 5b belonging to the gas intake head 5, then the perforation of the central cup of the cartridge 2 by means of a suitable member concentrically placed inside the

  attached 5b as is already known.

  When dealing with cartridges 2 with periodic depressions

  2a or notches established in accordance with the French patent 77 24136 of the present applicant, the inner face of each of the shells

  has projections or bosses 12 adapted to engage in the depressions-

  considered in order to immobilize the cartridge angularly. 2 with respect to the pot 1. Thus when it is screwed on the collar 8 is ensured a relative angular movement between the central cup of the top of the cartridge on the one hand, and the seal 5b of the intake of on the other hand, and this in accordance with the principle explained in the patent

French 77 24136.

  In an advantageous embodiment, the assembly constituted by the two shells comprises at least three protrusions 12 angularly distributed uniformly about the axis of the pot, while the cartridge is provided with at least three depressions. corresponding 2a equally distributed

way around its axis.

  It must, moreover, be understood that the foregoing description

  been given as an example and that it does not limit the field

  of the invention which would not be released by replacing the details of Exgcu-

  described by any other equivalent.

Claims (4)

R E V E N D I C A T I 0 N S   1. Sampling system from a gas tank under pressure   such as an interchangeable cartridge forming a lost package, of the kind comprising:   - a pot intended to contain at least partially the car-   key and provided at its upper part with a thread - a collar intended to be placed on the said   pot provided at its lower part with a complementary thread   to the thread of the pot - an annular sealing means, intended to be applied in a sealed manner against the central part of the upper wall of the cartridge   - a gas sampling head, fixed in the center of the adhesive   Rette, in the axis of the latter and comprising an axial means of perforation of the cartridge inside the sealing means characterized in that the pot (1) comprises two shells (la, lb) hinged one by relation to the other, and in that the threads of the pot (1) and   the flange (8) are arranged respectively outside and inside the   laughing. 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 known manner, the two shells comprise at least three male elements (12) angularly distributed regularly 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   regularly around the axis of a cartridge (2).   4. Apparatus for burning a combustible gas, characterized in that   it comprises a system according to any of the preceding claims cédentes.