JPH0156320B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Technical Field of the Invention The present invention relates to a disposable liquefied gas cartridge.

B. Prior Art French Patent No. 1133075 describes a liquefied gas extraction device having the following features.

(i) Use a liquefied gas cartridge that is in the form of a sealed can with a cylindrical lower part and a convex upper part, and a cup-shaped recess with a round cross section in the center of the convex top wall.

(ii) The support is a bell-shaped support that covers at least a portion of the top wall of the cartridge, including the central portion, and an elastic clip is pivotally attached to the support as an auxiliary connecting member for holding the cartridge inside the support. use.

(iii) As the annular sealing member, a tubular push rod is used which can slide axially relative to the gas extraction head, is biased downward by an elastic member (=spring), and has an annular sealing gasket at its free end.

(iv) As the axial gas extraction member, a punching needle is used, which is fixed to the head and is located inside the tubular push rod, and is adapted to make a hole inside the annular sealing gasket in the central part (cup part) of the top wall of the cartridge.

FR 1 295 539 describes the use of a rigid stylus-shaped member pivotally connected to the support as an auxiliary connection member for connecting the cartridge to the bell-shaped support.

French Patent No. 1169193 and French Patent No. 1503773 disclose a similar auxiliary connecting member which is held on the rim of the lower part of the support by a bayonet mechanism.
The use of a lower cover that is separate from the support is described.

All of these devices include two transversely elastic metal strips forming springs that rest against the recessed bottom of the cartridge or against the protruding top of the cartridge. The elastic strip is in some cases from the central part of the bayonet lower cover (FR 1 169 193), and in some cases from the central part of the support with a threaded ring into which the gas extraction head is screwed. Each is diagonally flared and in each case exerts an axial pressure on the cartridge, thus pressing it against the support or auxiliary connection member. The cartridge is thus held axially in the support before or after screwing the gas extraction head on. At this time, some friction exists between the cartridge and the support or auxiliary connection member.

For various reasons, particularly in terms of cost, the elastic strips described above are difficult to employ in practice. This is because the absence of the elastic strip is not inconvenient for the user when connecting and disconnecting the gas outlet head and the cartridge.

However, in order to guarantee maximum safety for the user of this device with a bell-shaped support, extreme conditions of use, such as keeping the sealing gasket crimped on the cartridge for a very long time, sealing the cap of the cartridge must be avoided. The case where the gasket sticks must also be taken into consideration. When unscrewing the gas extraction head, especially in devices that eliminate elastic strips, the sealing gasket can become detached from the free end of the tubular pushrod and remain on the top wall of the cartridge. In this case, there is no problem in removing the used and empty cartridge, but there is a problem in installing a new filled cartridge. When actually screwing in the gas outlet head and drilling a hole in the cup of a new cartridge, if the user does not confirm in advance that there is an annular sealing gasket on the tubular push rod, there is a risk of drilling the hole without sealing. There is.

C. OBJECT OF THE INVENTION An object of the present invention is to solve the above-mentioned problem of sticking of the sealing gasket to the cartridge without complicating the device.

Naturally, in achieving this purpose,
It is to be avoided to change the connection method of the gas extraction head or to introduce major changes in the entire gas extraction and use equipment and the manufacturing method of the cartridge.

D. Summary and Structure of the Invention The present invention provides an engaging member that suppresses relative rotational movement between the support and the cartridge, thereby exerting a shearing force between the sealing gasket and the cartridge to remove the sealing gasket from the cartridge. It is something that separates.

That is, the present invention provides a device for extracting and using liquefied gas contained in a disposable cartridge having a cylindrical side wall and a dome-shaped top wall, which includes at least (a) the dome-shaped top wall of the cartridge as a gas extraction means; (b) an annular elastic sealing member capable of airtightly abutting the center portion of the dome-shaped top wall of the cartridge; and an axially disposed member acting inside the elastic sealing member; (c) a gas extraction head that has a gas extraction member and can be screwed into the center of the support; a member for holding the cartridge;
, by providing on the support one part of the interlocking member consisting of positively interlocking portions located about a common axis of the support and the cartridge, the other of the interlocking member from a support which engages and holds a cartridge provided with a portion;
When unscrewing the gas extraction head, the relative rotational movement between the support body and the cartridge is suppressed, and the force of unscrewing the gas extraction head creates shear in a direction transverse to the axial direction between the elastic sealing member and the cartridge. The top wall is shaped to be covered by a gas outlet head support of the device so as to cooperate with the device using liquefied gas, which is designed to effectively act as a force, and the top wall is shaped to be covered by the gas extraction head support of the device, and the interlocking device arranged on the support A disposable liquefied gas car having a cylindrical side wall and a dome-shaped top wall, characterized in that an engaging member portion is provided around the axis of the cartridge, the engaging member portion cooperating with the member portion to constitute a positive engaging member. Provide a trilogy.

The following specific example is preferable as a specific example of the configuration of the present invention.

(i) The central portion of the cartridge top wall covered by the support may have a similar shape or a different shape from the remaining top wall portion. In the latter case, the central part against which the annular sealing member sealingly rests may be in the form of a circular head projecting from the cartridge with an inverted side profile and forming a shoulder in diametrical section, or a cylinder provided in the center of the cartridge. It is fixed to a shaped cap and the central boss is pressed or unpressed into the shape of a cap.

(ii) The cartridge may or may not be provided with a gas intake valve, such as an aerosol valve, in the center of the top wall, for example in the form of a cap as described above. In the former case, the gas extraction member is composed of a push rod valve,
In the latter case, the piercing member may be a tubular needle or a pointed needle.

E Effects of the Invention With the above configuration of the present invention, the relative rotational movement of the cartridge and the support body is suppressed regardless of their relative angular positions. That is, when the gas outlet head is unscrewed, the sealing gasket is subjected to a twist that varies in magnitude depending on the strength of the rotational friction between the tubular push rod and the gas outlet head hole that receives the push rod. Since the cartridge is immobile in the direction of rotation, the annular gasket is always subjected to a transverse shearing force. This shear force creates or facilitates separation from the cartridge top wall.

Furthermore, the above configuration of the present invention provides the following advantages.

(i) When the cartridge is connected to the gas extraction head with the piercing needle attached, rotation of the needle and the gas extraction head relative to the fixed cartridge forces a circular hole in the cap.
A gas passage of narrow dimensions between the needle and the edge of this hole is thus ensured. However, if the cartridge rotates due to the rotational movement of the gas extraction head while the annular sealing gasket and the cartridge cup are in contact with each other, this forced cutting action cannot necessarily be obtained.

(ii) The present invention provides a positive interlocking member around a common axis of the support and the cartridge, thereby ensuring alignment of the two. Therefore, there is no large offset between the cartridge and the support, and the sealing effect between the sealing gasket and the cartridge is further enhanced, improving safety.

F Description of Embodiments Embodiments of the cartridge of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the lower part of a pressurized liquefied gas extraction and use device 1 with a gas extraction head 2 as described in FR 1 133 075.
The head 2 is equipped with a tubular push rod 3 and a fixed piercing needle 4. Pushrod 3 is head 2
It is movable in the longitudinal direction with respect to the axial hole 2a. An annular gasket 5 surrounding the push rod 3 reliably seals the space between the push rod 3 and the hole 2a. The push rod 3 has a compression spring piece 6
It is biased downward by. The free end of the push rod 3 is provided with a head 7 adapted to hold an annular gasket 8.

The head 2 is provided with an annular member 9 with a screw hole (a second
A suitable cooperating screw 2b is formed in FIG.

The cartridge 11 is covered with a downwardly open bell-shaped support 10. Peripheral base portion 10a of support body 10
at least partially surrounds the side wall 11a of the cartridge 11. Two pivoted stapes 1
2 and 13 into the notches 10b formed in the horizontal flange of the support 10. The cartridge 11 is stored in the support 10 by screwing the gas extraction head 2 into contact with the top of the cartridge 11.

As shown in FIGS. 3 and 4, when each stylus-shaped member 12, 13 is placed under the bottom of the cartridge 11, the top wall 11b of the cartridge 11 and the support 1
0 and the horizontal wall 10c is determined. When the gas extraction head 2 is screwed into the ring member 9, the piercing needle 4 makes a hole in the cartridge 11 so that the gas flows in the direction of the device 1. An annular gasket 8 fitted into the head 7 of the tubular push rod 3 is positioned around a hole formed in the central portion of the cup portion 11c of the cartridge 11. When the head 2 is screwed in, the gasket 8 is attached to the cup portion 1 of the top wall 11b of the cartridge 11.
1c to form an airtight seal.

In order to exert a shearing force on the gasket 8 when screwing back the gas extraction head 2, at least three bosses 14 are formed by deformation on the base portion 10a of the support 10, as shown in FIG. protrudes inward from the inner surface of the hem portion 10a. Each boss 14 is arranged evenly around the base portion 10a. In the case of forming the three bosses 14 shown, they are spaced apart from each other by 120 DEG around the geometrical axis of the support 10.

In order to ensure angular fixation by the boss 14, at least three longitudinal ribs 15 are formed on the side wall 11a of the cartridge 11 by stamp deformation toward the center of the cartridge 11. The orientation of each rib 15 is parallel to the geometric axis of the cartridge 11. Each rib 15 is arranged evenly around the cartridge 11. In the illustrated case, the ribs 15 are arranged at a distance of 120 DEG from each other around the geometrical axis of the cartridge 11. As shown in FIG. 6, the depth of each rib 15 is such that each boss 14 easily fits into each rib 15 and is connected to the support 10.
The height is made slightly larger than the height of the boss 14 so as to prevent relative rotation between the boss 11 and the cartridge 11. Each rib 15 is connected to the cartridge 11 as shown in FIG.
It leads to the top wall 11b of. Each rib 15 also serves to strengthen the walls of the cartridge, thus increasing the resistance of the cartridge 11 to crushing.

Due to the cooperation of the boss 14 and the rib 15, even if the gasket 8 is stuck to the cartridge 11, the cartridge 11 will not rotate inside the support body 10 by unscrewing the gas extraction head 2. .

In other words, the shear force effect will definitely work.

A device containing a cartridge may be left unused for a long period of time, for example 6 to 8 months. If the temperature is high, for example in a tropical climate, the sealing gasket 8 may stick to the cartridge 11. In such a case, the annular gasket 5 would also stick to the push rod 3 and the hole 2a of the gas extraction head 2.

Even under such a situation, if the gas extraction head 2 is screwed back, the support 10 and the cartridge 11 can be removed.
Since the cartridge 11 is angularly fixed to the support 10, the cartridge 11 does not rotate relative to the support 10, and a shearing force is applied to the sealing gasket 8 due to twisting to release the attachment to the cartridge 11. Promote its release.

Separation of the sealing gasket and cartridge is thus effected or facilitated simply by unscrewing the gas extraction head.

Note that the support 10 may have any shape, and in particular, its base portion 10a is shown in FIGS. 7, 8, and 9.
Supports 10', 10'', 10 respectively illustrated in the figure
It may extend further below the bottom of the cartridge 11, as shown in FIG. In this case, as described in the specifications of French Patent No. 1169193 and French Patent No. 1503773, the cartridge is held by a cover (not shown) that closes the downward opening of the base portion by a bayonet mechanism. I'll pull over and do it. In the supports 10'', 10 of FIGS. 8 and 9, each support 10'', 10 is
0'', 10 are provided with at least three strips 16 that fit into grooves provided in the cartridge and position the cartridge correctly.

Incidentally, it is preferable that the number of male-shaped portions and female-shaped portions formed on the support body and the cartridge, respectively, or vice versa, be an odd number. The reason for this is that it is possible to prevent the dimensional errors of the two bosses located facing each other from being added together, thereby improving the alignment accuracy of the cartridge.

Although the present invention has been described above in detail with reference to its embodiments, it goes without saying that the present invention can be modified in various ways without departing from its spirit.

[Brief explanation of drawings]

FIG. 1 is an axial sectional view of one example of a known gas extraction head, and FIG. 2 is an embodiment of the main parts of the gas extraction head and its cooperating support of the cartridge of the present invention and the gas extraction device used therefor. FIG. 3 is a developed front view of the example, and is a reduced front view showing the members shown in FIG. 2 in an assembled state. 4 is an enlarged axial sectional view of the main part of FIG. 3, FIG. 5 is a bottom view of the support shown in FIG. 2, and FIG. 6 is an enlarged sectional view taken along the line - in FIG. 4. 7, 8 and 9 are front views of different variants of the support. DESCRIPTION OF SYMBOLS 1... Gas extraction device, 2... Gas extraction head, 3... Tubular push rod, 4... Punching needle (gas extraction member), 8... Annular gasket (annular sealing member), 10... Support, 11 ...Cartridge, 11b...Top wall, 11c...Cup part (center part), 12, 13...Stirrup-shaped member (auxiliary holding member), 14...Boss (male-shaped part), 15...
Rib (female piece).

Claims (1)

[Scope of Claims] 1. A disposable liquefied gas cartridge having a cylindrical side wall and a dome-shaped top wall, which includes at least the following gas extraction means for taking out and using the liquefied gas contained in the cartridge: (a) Support 10 covering at least the central portion 11c of the dome-shaped top wall 11b of the cartridge 11
(b) An annular elastic sealing member 8 that can airtightly abut the central portion 11c of the dome-shaped top wall 11b of the cartridge 11, and a gas extraction member disposed in the axial direction that acts inside the elastic sealing member 8. 4 and which can be screwed into the center of the support 10; (c) when the gas extraction head 2 is screwed into the support 10, it functions to hold the cartridge 11 within the support 10; , members 12, 13 for supporting the support 10 and holding the cartridge 11, and by means of positively interlocking portions 14, 15 located around a common axis of the support 10 and the cartridge 11. An interlocking member 14 configured,
By providing one part 14 of 15 on the support 10, gas can be taken off from the support 10 which engages and holds the cartridge 11 provided with the other part 15 of the interlocking members 14, 15. When unscrewing the head 2, the relative rotational movement between the support body 10 and the cartridge 11 is suppressed, and the force of unscrewing the gas extraction head 2 is applied to the elastic sealing member 8 and the cartridge 11.
The top wall is shaped so as to be covered by the gas extraction head support 10 of the device so as to cooperate with the liquefied gas using device. It is characterized in that an engaging member part 15 is provided around the axis of the cartridge 11, which cooperates with the engaging member part 14 disposed on the support 10 to form positive engaging members 14, 15. The said cartridge. 2 Three positive interlocking members 14, 15, 1
4. A cartridge according to claim 1, comprising at least a portion 15 of 4, 15, 14, 15. 3. A sample-shaped piece 15 and a support 10 arranged on the cartridge 11 as interlocking members 14, 15.
3. Cartridge according to claim 2, characterized in that it is provided with male-shaped parts 14 arranged above or inversely arranged. 4 An axial groove 1 extending from the side wall 11a of the cartridge 11 to the top wall 11b as a female shaped piece 15
5. The cartridge according to claim 3, further comprising: 5.