FR2476269A1 - IMPROVEMENTS IN THE CONNECTION SYSTEMS OF A GAS TANK TO A HEAD FOR THE GAS TESTING - Google Patents

Abstract

EACH OF THESE SYSTEMS INCLUDES A SUPPORT MADE BY MEANS OF TWO 4, 5 SHELLS ARTICULATED BETWEEN THEM AT THE LEVEL OF THEIR BASE AROUND AN AXIS 6, 7 SO THAT IN CLOSED POSITION A THREADED CENTRAL OPENING 5G IS IN AXIAL COINCIDENCE WITH A 4H CENTRAL CUT IN THE SHELL 4 SO THAT THE SCREWING OF THE THREAD 2A OF A TAKING HEAD 2 LOCKED TOGETHER THE TWO SHELLS AND THAT THE TOTAL UNSCREWING OF THIS HEAD CONSTITUTES A NECESSARY MEANS TO FREE THE SHELLS. PORTABLE APPLIANCE OPERATING ON COMBUSTIBLE GAS.

Description

The present invention relates to a system for fixing a

  perforated-wall gas tank at a sampling head of this gas. It relates more particularly to combustion apparatus for a pressurized fuel gas available in liquefied form in interchangeable lost packages known in the art as cartridges. By way of non-limiting example, the invention refers to portable appliances for cooking, lighting, heating and welding

  powered from butane cartridges.

  In the known manner, each apparatus envisaged above comprises a gas sampling head equipped with a tap and which is screwed into an opening in the center of a support such as a bell capable of gripping the cartridge. More specifically, the head in question is screwed into the tapped hole of a central piece itself fixed in the hole of the support. An axial perforation means, for example a flat tip, is axially disposed in the head so as to perforate the cartridge within an annular seal or the like which is sealingly applied against the central portion of the seal. upper wall of the cartridge.

  French patent 1,419,891 has proposed a system for fixing

  tion constituted by a support for receiving the cartridge, comprising at least two holding parts or stirrups each shaped to grip this cartridge, and which are movable relative to each other and more precisely articulated to each other by an intermediate piece a first stirrup is articulated on an upper central part, while the second can be housed in the upper part of said central piece in a gutter provided for this purpose; with all these provisions the support can open and close on the cartridge. The central part of the support comprises a threaded hole in which is screwed the axial end, threaded externally, a sampling head of

gas with faucet.

  The annular seal required for sealing with the cartridge is fixed below the central part of the support so as to surround its threaded hole. This seal is also in sealing contact with an axial perforation trocar of the cartridge, which is part of the gas sampling head, so that the space surrounding the latter is isolated from

the outside of the device.

  In addition, an apparatus according to French Patent No. 1,419,891 comprises a security system consisting of a plate hinged to the central part of the support, adjacent the gutter, on the opposite side to the

24-76269 '

  tapped hole, this wafer being shaped to partially surround

  this hole. In a complementary manner to the wafer, the sampling head

  gas supply comprises an enlarged base intended to bear

  screwing on the support, against the plate.

  The implementation of an apparatus in accordance with French Patent No. 1,419,891 and its safety system is substantially the following: 1- The wafer being initially tilted to the open position, and the gas sampling head being initially unscrewed, rotates the stirrups around the intermediate piece to open a passage at the top of the support, accessible to a full cartridge. 2- By rotating the stirrups in the opposite direction around the same intermediate part, and around the central part of the support for the first stirrup, it closes said support by bringing the plate under

  the upper branch of the second stirrup.

  3- By folding the plate on the central part of the support, the second stirrup is brought into the gutter of said part; thus the support is completely closed, and the annular seal is sealingly applied against the central portion of the wall

top of the cartridge.

  4- Finally, the gas sampling head is screwed into the tapping of the central part of the support, whereby the trocar comes to perforate the cartridge and, on the other hand, the plate is blocked between the base enlarged head of gas sampling and the

center piece of the support.

  - The removal of an empty cartridge is done by operating from

  reverse to previously defined operations.

  At the level of the security system, it is appropriate to make

  following statements. On the one hand, it is a system as such; dis-

  the other parts and functional elements of the apparatus, materialized on one side by the plate articulated on the central part of the support, and on the other side by the enlarged base of the gas sampling head, which comes through screwing block the folded plate. On the other hand,

  to perform its security function, this system requires two

  Positive feedback from the operator, ie fold down the wafer on the center piece of the support, and screw completely (and not partially)

  the gas intake head on the support.

  It follows from the above findings that the security provided by the French patent 1,419,891 is relative, and does not eliminate as much as possible all possible false maneuvers for a user.

of average attention.

  First, any user can manually bring the second caliper into the gutter provided on the central part of the support, without the help of the tongue, that is to say without folding it. Therefore, without having brought the tongue against the aforementioned central part, the user can normally screw the gas sampling head and thus perforate a solid cartridge. In this case, the security system has not been implemented, it remains completely inactive, and can play no role. And, in the opposite direction, the user can open the

  without the gas intake head being unscrewed.

  Then, there can be proper centering of the cartridge in its support if the gas sampling head is screwed completely on the support, blocking the plate folded on the latter. Incomplete screwing of the gas intake head partially releases the wafer, and allows some clearance of the cartridge with respect to the support, with all the detrimental consequences that may

  level of cartridge-device sealing.

  In total, the security system in accordance with French Patent No. 1,419,891 does not provide the user with all the necessary guarantees against the false maneuvers, essentially because it is a system reported on the devices considered, requiring positive action on the part of the user, independent of the setting up and

  perforation of the cartridge in the holder.

  The present invention aims to remedy the drawbacks raised above, and more specifically it relates to a system of the same type as that shown by the prior art, but for which the security means sought are integrated and somehow "blend" into the the system itself, so that the mere establishment of the

  gas sampling head is sufficient to achieve the expected safety effect.

  Furthermore, the present invention proposes to achieve a fastening system with the least possible parts, which can be handled in a simple manner by any average user of attention, so as to avoid any mishandling as much as possible. In particular the invention aims to make apparent the existence of any false maneuver, such as the installation of the gas sampling head on only one part

of the support.

  According to the invention, the partial screwing of the gas sampling head on the support is a sufficient means to lock the two holding parts in the closed position of the support on the support relative to one another on the support. cartridge, while the total unscrewing of the gas sampling head is a necessary means to release relative to each other, the two holding parts in the open position of the support. By "support", within the meaning of the present invention, is meant any set of parts whose arrangement has the function of at least partially containing and centering the cartridge.

  include different parts, including two holding pieces.

  By "holding piece", within the meaning of the present invention, is meant any piece whose shape allows to grip directly or indirectly

the cartridge.

  The solution according to the invention makes it possible to remedy the drawbacks

  nients encountered in the prior art, because security thus becomes intrinsic, and no longer extrinsic to the means of setting up and

removal of the cartridge.

  Under these conditions - the manipulation of devices provided with a system according to the invention does not require education or important information of the user, to instill in him an appropriate safety reflex, - the security effect sought s by itself, when placing the gas sampling head on the support, by

screwing these two pieces.

  The invention is original in that the means that characterize it

  prohibit any accessibility to the inside or outside of the

  port, as long as the gas sampling head is screwed onto it.

  Consequently, any false maneuver can lead to an alteration of the cartridge-apparatus connection, for example if there is an obliquity between the

  cartridge and the gas sampling head, becomes excluded since -

  - The latter can come into contact with the cartridge if it is perfectly centered on the support, with locking of the latter in the closed position; - the support can only be opened if the gas sampling head is unscrewed completely from it, ie in practice

  when removing an empty cartridge for the installation of a cartridge.

  full key; partial unscrewing of the head does not open the

support; - -

  - There can be no partial closure of the support, but only a total closure, at the time of screwing the gas sampling head; conversely, as long as it is screwed onto the

  support, it can not be opened, even partially.

  The present invention is also useful in the contaxte described in the French patent application 77 24136 filed on 29.7.77 by the Applicant. According to this application and for various technical reasons explained in the latter, it has been proposed to provide the support with at least three male elements, distributed angularly in a regular manner about its axis, and to provide each cartridge with at least three corresponding female elements. , angularly distributed, regularly around

  the axis of said cartridge, and intended to engage in said ele-

male

  Correlatively, when a support according to the invention, and in particular

  the two holding parts comprise male elements as described above, it is impossible to close, and therefore screw the sampling head, as the said male elements are not engaged in the female elements of the cartridge. Therefore, a fastening system according to the invention almost automatically encourages the user to put the female elements of the cartridge, by rotation of the latter, in correspondence with the male elements of the support, for

completely close this one.

  The accompanying drawing, given by way of example, will provide a better understanding of the invention, the characteristics it has and the advantages it is likely to provide: FIG. 1 is an exploded view showing a system according to the invention for enclosing a cartridge of gas under pressure in order to

  to allow its connection with a gas appliance.

  Fig. 2 is a view in the mounted state with tearing but

  represented on a larger scale.

  Fig. 3 is a view from above of the system according to the invention

  inside which the cartridge is placed.

  Fig. 4 is a view from above of a system made according to a

  variant of the invention and shown in the open state next to a cartridge

of gas under pressure.

  Fig. 5 is a view from above in the mounted state of the system

according to fig. 4.

  Fig. 6 is a broken elevational view of a system

according to the variant of fig. 4.

  Fig. 7 is a view similar to that of fig. 1 but showing

  another alternative embodiment of the system according to the invention.

  Fig. 8 is a partial longitudinal section of the system

according to fig. 7.

  In order to facilitate the tight connection between a pressurized gas cartridge 1 and the base 2a of a sampling head 2 (belonging to any gas appliance), a fixing system 3 according to the present invention is used. and which is a preferred embodiment of the latter. Note that the cartridge 1 has a domed top provided in its center with a concave cup lb. As shown, the fastening system 3 is in the form of two symmetrical shells referenced 4 and 5, or holding parts completely enveloping the cartridge 1, which are hinged together, about a same horizontal axis located at their level. bases 4a, 5a. These bases correspond to a portion with a slightly larger diameter of each of the shells 4 and 5. They each comprise a falling edge 4b, 5b oriented transversely relative to each shell and on which rest the lower bead 4c of the cartridge 1, as we will explain it better later. Each of the bases is extended by two ears 4c, 4d respectively 5c, 5d which come two by two side by side so that each of the perforations formed in the center of each ear come into correspondence. The pairs of ears 4c, 5c and 4d, 5d are assembled by means of a rivet which leaves between these ears a certain clearance so as to allow easy tilting of

  two shells relative to each other.

  Each shell has a neck 4th, 5th and a horizontal and transverse wing 4f, 5f in the form of a semicircle

  prolonged by a central lug which also projects a semi-

  circular as is more particularly illustrated in FIG. 3. We observe in fig. 2 that the center 4g of the upper transverse wing 4f is raised and comprises in its center a 4h cutout having a circular shape. As for the lower transverse wing 5f of the shell 5, it comprises in its center an opening 5g with directly threaded edge located coaxially with respect to the cut 4h, in the closed position explained below. It is observed that the transverse wing 5f of the shell 5 bears against the inner face of the transverse wing

4f of the shell 4.

  If the cartridge 1 is of the type with axial depressions id is planned to provide in the side wall of the two shells 4 and 5 projections 5, 5 oriented towards the center and which are intended to engage

  in the corresponding depressions 1d of the cartridge 1.

  When starting from the open position of fig. 1 we begin with the cartridge 1 between the two shells 4 and 5 open jaw-shaped; these two shells are then rotated around the rivets 6 and 7 so as to bring them into the closed position shown in FIG. 3, taking care to place the projections 4j, 5j in the depressions ld, otherwise the support (4, 5) can not close on the cartridge 1. The two transverse wings 4f and 5f corresponding shells are placed one below the other as shown in fig. 2, and above the cartridge 1, the cut 4h coming opposite the tapped opening 5g. The cartridge at this moment is trapped and centered between the two shells. In the free state its bead is in abutment against the edges 4b, 5b of the two shells. It is then possible to screw the threaded axial tip 2a of the apparatus 2 into the threaded opening 5g until the usual annular seal 2b carried by the end of a piston

  tubular associated with the base 2a (see the description given in the patent

  French 1 133 075), comes into sealing support against the surface of the cup 1b. Continuing the screwing, on the one hand causes the support of the bead 1c against the edges 4b, 5b of the shells, then the perforation of the wall of the cup 1b inside the seal 2b, so that

the device can be powered.

  It is easily understood that the base 2a remains screwed relative to the threaded opening 5g, there can be no gas leakage and that it is only once the total unscrewing of the base carried out that

  can open both shells to extract the cartridge.

  In the embodiment shown in FIG. 4 we are dealing with shells 8, 9 similar to those 4 and 5 previously described but which are articulated not at their base but along two of them.

  their corresponding vertical edges, so around a similar vertical axis

  cal and lateral. These edges are rolled in such a way as to allow the introduction

  The upper parts of the two shells are made in a manner similar to that of the variant of Fig. 2, i.e. 'they have, above a collar, two walls which affect the shape of a

  semicircle whose center comprises a semicircular leg 8a respectively

  9a. The center of each of the transverse wings of the two shells is provided with respect to the first of a tapped central opening 9b, while in the second there is provided a central cut 8b. To connect the device 2 to the cartridge 1 by means of a system comprising shells 8 and 9, the cartridge is engaged in one of these,

24-76269

  its bead lc resting against its horizontal flange 8c or 9c, then the other is rotated until the cutout 8b is placed above the tapped opening 9b and concentrically to the latter as it has been represented é-in fig. 5. If the cartridge has depressions ld it is expected to provide radial projections oriented towards the center

  in both shells 8 and 9 so that the cartridge is immobilized.

  angularly with respect to these shells. In the example shown

  the shells have three projections referenced 8d and 9d.

  We note in fig. 5 that in the same way as for the example of

  Fig. 2, the central portion 8e of the tab 8a is slightly displaced

  above the general plane of this leg so that 9a comes to bear against the underside of the non-raised portion of said tab 8a. Thus when the base 2a of the apparatus 2 is screwed into the tapped opening 9b and that the device itself bears against the raised portion 8e of the tab 8a it does not tend to sag so that the attachment of the apparatus 2 is rigid. We will not go back to the way the sealing is done between the device 2 and the cartridge 1 because it is strictly identical to that described

with reference to fig. 2.

  According to an embodiment illustrated in FIG. 7 is a system comprising a stirrup 11 and a bell 12. The stirrup 11 is

  from a strip of spring steel, both ends of which are

  to form a hook 11a, 11b and which is arched so as to affect at rest the general shape of an open V downward. The stirrup is manufactured to include in its middle a web 11c whose center is provided with a threaded opening 11d. The two wings of the stirrup 11 are advantageously rounded in cross section for reasons which will be explained better later. Each of these wings may comprise a projection lle, 11f adapted to cooperate with a corresponding depression ld

of the cartridge 1.

  The bell 12 has a cylindrical skirt 12a whose. lower edge 12b is flared, while its upper part is connected to a transverse wall 12c having in its center a 12d diameter cutout

  slightly higher than that of the tapped opening lld.

  To assemble an apparatus such as that 2 to a cartridge 1, the latter is placed between the two branches of the stirrup 11 and then these are folded towards the cartridge so that the hooks 1a, 11b are placed under the bead lc of this cartridge. Then the bell 12 is engaged around the caliper-cartridge assembly so as to lock it against the cartridge as illustrated in FIG. 8. The rounded shape of the branches of the stirrup allows it to tackle

  against the side wall of the cartridge.

  It is observed that once the bell engaged around the stirrup 11 its transverse wall 12c is raised relative to the web 1c of the stirrup so that again the cut is located above the opening

  threaded for the reasons explained above with reference to fig. 6.

  It is easy to understand that once the apparatus 2 is screwed into the opening 11, the bell is locked relative to the stirrup so that the system according to the invention, the apparatus, and the cartridge form a

rigid set.

  It must, moreover, be understood that the foregoing description

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

  of invention that could not be dispensed with by replacing the details of

  described by any other equivalent. In particular and as indicated above, it is readily conceivable that the system according to the invention can cooperate with cartridges devoid of depression provided the protrusions provided in the shells, stirrups or the cap are eliminated.

Claims (11)

R E V E N D I C A T IO N S   1. System for fastening a device or gas sampling head   relative to a pressurized gas reservoir such as an irreversible cartridge   terchangeable forming lost packaging, of the kind constituted by a support for receiving the cartridge, comprising at least two holding parts, movable relative to each other, shaped to at least partially enclose said cartridge, and annular means of sealing, intended to be sealingly applied against the central part of the upper wall of the cartridge, the gas sampling head comprising an axial means of perforation of the cartridge inside the sealing means, and which can be screwed axially on the support, characterized in that the at least partial screwing of the gas sampling head on the support is a sufficient means to lock one relative to the other, the two holding pieces, in the position of closing the support on the cartridge, and in that the total unscrewing of the gas sampling head is a necessary means to release the one by   in relation to the other, the two holding pieces, in the open position of the -   support. 2. System according to claim 1, wherein the gas sampling head comprises an externally threaded axial end, and the support comprises a central opening provided with a thread complementary to said endpiece, characterized in that at least one any of the holding parts comprises a central cutout arranged to come into axial coincidence with said opening, in the closed position of the support. 3. System according to claim 2, characterized in that the two holding parts, articulated with respect to each other, each have a horizontal wing with perforated portion, located above the cartridge when the support is in position. closing position, and in that in said closed position, on the one hand the two horizontal wings   overlap at least partially, and on the other hand both   are brought into axial coincidence, the lower perforation having a complementary thread co-operating with that of the end-piece   axial of the gas sampling head.   4. System according to claim 3, characterized in that the two holding parts are hinged relative to each other, around   of the same horizontal axis located at the lower part of the support.   5. System according to claim 3, characterized in that the 1l two holding parts are articulated with respect to each other,   around the same vertical axis, located on the side of the support.   6. System according to claim 3, characterized in that each holding member has at its lower part a flange for the support of the lower bead of the cartridge. 7. System according to claim 3, characterized in that, in the   closing position, the two pieces of the cartridge.   8. System according to any one of claims 2 to 7,   characterized in that the edge of the opening is directly in the form of a net. 9. System according to claim 2, characterized in that one of the holding parts is constituted by an elastic stirrup whose veil   cross-section has the threaded aperture and has a general shape   the inverted V, while the other holding part affects the shape of a bell that caps the caliper to apply against the cartridge with locking the bottom thereof, the top of said   bell being provided with the central cutout.   10. System according to any one of the preceding claims,   characterized in that in a manner known per se, the support, and in particular at least one of the holding parts, comprise at least three male elements angularly distributed regularly around the axis of said support, which male elements are intended to engage in at least three corresponding female members, angularly distributed   regularly around the axis of a cartridge.   11. Apparatus for burning a combustible gas, characterized in that   it comprises a system according to any of the claims preceding.