Patent Description:
Document <CIT> discloses a personal protection device according to the preamble of claim <NUM> and a method according to the preamble of claim <NUM>.

More particularly, the inflatable element is inflated in the event of an impact by an inflation device which is placed in fluid communication with the said inflatable element. Generally, said inflation device includes a fluid source, such as a compressed gas cylinder, which is generally referred to as a gas generator. Subsequently, the inflatable element must be deflated in order to allow removal of the device, for example for replacement of the inflatable element, or in any case for continuation of an activity which a user was performing before the impact, eliminating the volume created by the inflatable element in the inflated condition. For this purpose, generally the personal protection devices are provided with a venting device associated with the inflatable element for favouring the outflow of the inflation fluid and for allowing therefore deflation of the inflatable element. The venting device includes an additional tube which is inserted in an edge of the inflatable device and which places the inside of the inflatable element in communication with the outside and is provided with an on/off valve which can be opened manually in order to favour the outflow of the fluid.

The present disclosure is based on a recognition by the inventor of the present disclosure that the personal protection devices, as provided hitherto by the prior art, while being advantageous from many points of view, have a number of drawbacks in terms of constructional efficiency and, in particular, the need for an additional production step in order to provide the inflatable element with the venting device.

The starting point of the present disclosure is the technical problem of reducing at least one of the steps for production of a personal protection device involving the provision of a venting device, thereby improving the constructional and structural efficiency, without negatively affecting the inflation capacity to ensure protection in accordance with the requirements mentioned above with reference to the prior art, and/or achieving further advantages.

Such a technical problem is solved by providing a personal protection device and a connection method according to the respective independent claims. Secondary characteristics forming the subject of the present disclosure are defined in the corresponding dependent claims.

In particular, in accordance with the present disclosure, in order to improve the deflation of the inflatable element, it is proposed providing a personal protection device comprising an inflatable element, and an inflation device, which in turn comprises a gas generator and the improved bush connection device, which is configured both to connect the gas generator and the inflatable element and at the same time to allow deflation of the inflatable element, and to act as a venting device. As a result, according to one aspect of the present disclosure, the venting device forms part of - namely is integrated or incorporated in - a bushing connection device configured to connect the gas generator to the inflatable element.

More particularly, in accordance with the present disclosure a personal protection device is provided, said device comprising the inflation device (including, as mentioned, the bushing connection device described and the gas generator) and the inflatable element configured to be able to assume a deflated or rest configuration and an inflated or active configuration. The gas generator is configured to allow inflation of the inflatable element from the deflated configuration into the inflated configuration.

More particularly, the bushing connection device comprises a tubular body extending between a first mouth and a second mouth. Furthermore, the tubular body defines an internal cavity able to house a portion of the gas generator and intended to allow the outflow of the gas. In particular, a first end region of the tubular body defines the first mouth and a second end region of the tubular body defines the second mouth. Furthermore, the bushing connection device further comprises a vent channel which extends along at least a portion of the tubular body so as to vent a fluid of the inflatable element, i.e. a fluid contained in the inflatable element. In particular, the vent channel has a cross-section with a smaller area than the second mouth. In particular, the second mouth opens out into the inner chamber of the inflatable element, namely on the opposite side where the gas generator portion is connected/inserted. As regards the geometry of the parts described above, the inflation device comprises the bushing connection device described here and the gas generator configured to allow inflation of the inflatable element, wherein a portion of the gas generator intended to inflate the inflatable element is inserted inside the internal cavity of the tubular body from the side of the first mouth.

Preferably, the vent channel is arranged at least partially inside the tubular body.

In some embodiments, the vent channel is in the tubular body and extends inside the tubular body, over a limited portion thereof. In some embodiments, the vent channel is completely incorporated in the tubular body.

The gas generator portion and the tubular body are suitably configured to leave the vent channel free for venting the inflation fluid. In other words, the insertion of the gas generator portion into the tubular body is performed so as to leave free a passage (vent channel) for venting the inflation fluid.

The vent channel may be partly in the tubular body and partly formed by an interstice which is present between the gas generator and the tubular body. Again alternatively, the vent channel may be partly in the tubular body and partly formed by a groove which is present on an inner side of the tubular body facing the gas generator.

Preferably, the personal protection device according to the present disclosure may include furthermore a clamping device for clamping the inflatable element portion on the tubular body of the bushing connection device. The clamping device may include a sleeve, for example, as well as a seal. A seal may also be provided between the portion of the gas generator housed inside the internal cavity of the tubular body and the tubular body itself.

Finally, in accordance with the present disclosure, a connection method for connecting a gas generator to an inflatable element by means of the aforementioned bushing connection device is described. Said connection consists of a connection both for mechanically connecting the gas generator to the inflatable element and for placing the gas generator in fluid communication with the inflatable element at the time of inflation and for placing the inflatable element in fluid communication with an environment outside the inflatable element and the gas generator at the time of deflation.

Basically, according to the present disclosure, it is possible to provide a personal protection device which is provided, in a single assembly, namely as one piece, with a venting device and a connection device. The latter in fact comprises a vent channel able to allow deflation of the inflatable element in such a way as to overcome the drawbacks of the prior art whereby an additional step is required for the venting device.

Similarly, the method described in the present disclosure is able to improve the connection between the gas generator and the inflatable element so as to favour deflation of the latter, in such a way as to overcome the problems encountered in the devices of the prior art.

The personal protection device according to the present disclosure may be a wearable personal protection device, i.e. one which is configured to be worn, or is in the form of a protective garment.

Further advantages, characteristic features and modes of use forming the subject of the present disclosure will become clear from the following detailed description of embodiments thereof, provided by way of a non-limiting example.

It is in any case clear that each embodiment forming the subject of the present disclosure may have one or more of the advantages listed above; in any case it is not required that each embodiment should have simultaneously all the advantages listed.

Reference will be made to the figures of the attached drawings in which:.

With reference to the attached figures, some embodiments of a bushing connection device for connecting a gas generator <NUM> to an inflatable element <NUM> are indicated - overall - by the reference number <NUM>. As indicated below, the bushing connection device <NUM> forms part of an inflation device which, in turn, forms part of a personal protection device <NUM>, preferably of the wearable type or in the form of a protective garment. In other words, the personal protection device <NUM> comprises the bushing connection device <NUM> according to one of the embodiments described above.

In particular, the bushing connection device <NUM> comprises a tubular body <NUM>, namely a sleeve-shaped body or more generally a hollow cylindrical body, which extends between a first mouth 110a and a second mouth 110b and defines an internal cavity <NUM> able to house a portion 15a of the gas generator <NUM>, intended to allow the outflow of gas.

The tubular body has a first end region 101a and a second end region 101b.

The first end region 101a of the tubular body <NUM> defines the first mouth 110a, namely opens out into the first mouth 110a, and the second end region 101b of the tubular body <NUM> defines the second mouth 110b, namely opens out into the second mouth 110b. In other words, the tubular body <NUM> is a hollow body, i.e. defining the internal cavity <NUM>, comprising a first end portion 101a, which delimits or defines the first mouth 110a, and a second end portion 101b, which delimits or defines the second mouth 110b.

Moreover, according to the present invention, the bushing connection device <NUM> further comprises a vent channel <NUM> arranged inside the tubular body <NUM> and extending along at least a portion of the tubular body <NUM>, for venting a fluid of the inflatable element <NUM>. In other words, the vent channel <NUM> is a venting through-opening arranged at least partially inside the tubular body <NUM> and is configured to create an independent channel which places the inflatable element and the external environment in fluid communication with each other and does not involve, namely is independent of, the aforementioned portion 15a of the gas generator <NUM> when the latter is connected to the inflatable element. In particular, the vent channel <NUM> has a cross-section with a smaller area than the second mouth 110b. Namely, the cross-section of the second mouth 110b, intended to allow the passage of an inflation fluid towards the inflatable element <NUM>, has a greater area, in fact a much greater area, than the cross-sectional area of the vent channel <NUM> intended to allow the passage of a fluid exiting the inflatable element <NUM>.

Preferably, the area of the second mouth 110b in relation to the cross-sectional area of the vent channel <NUM> is in a ratio of between <NUM>:<NUM> and <NUM>:<NUM>, preferably between <NUM>:<NUM> and <NUM>:<NUM>, and even more preferably the ratio is about <NUM>:<NUM>.

In this way, owing to the fact that the through-flow cross-sections are very different and owing to the principles of fluid dynamics and mass conservation, at the time of inflation, since the initial pressure of the air is identical inside the inflatable element and outside, the pressurised inflation fluid passes through the larger cross-section and fills mainly the inflatable element until the pressure inside the inflatable element is at a maximum; once this condition is reached, the fluid rapidly exits the vent channel, because of the difference in pressure between the inside and outside.

This process is compatible with the need to keep the inflatable element sufficiently inflated for a predetermined period of time, so as to ensure protection for a user at the moment of the impact or blow and then allow venting and deflation of the inflatable element after the impact or blow.

Preferably, the vent channel <NUM> has a cross-sectional area smaller than that of both the second mouth 110b and the first mouth 110a.

Preferably, in general, the vent channel <NUM> is configured to define a through-opening extending between the first end region 101a and the second end region 101b. In other words, the vent channel <NUM> is preferably a through-opening at least partially inside the tubular body <NUM> and extending substantially between the first mouth 110a and the second mouth 110b.

In particular, preferably the first end region 101a and the second end region 101b are free end regions of the tubular body <NUM> and the through-opening defined by the vent channel <NUM> may place in fluid communication with each other an outer zone on the side of the first free end and an outer zone on the side of the second free end.

Preferably, the vent channel <NUM> opens out in the first end region 101a alongside the first mouth 110a and opens out in the second end region 101b alongside the second mouth 110b, or in the second mouth 110b. Namely, the vent channel <NUM> may open out in the first end region 101a and in the second end region 101b, respectively, by means of an opening or aperture adjacent or close to the first mouth 101a and the second mouth 101b, respectively.

Preferably, the tubular body <NUM> comprises a side wall <NUM> or covering portion having a first thickness and incorporating at least partially the first end region 101a. Furthermore, the tubular body <NUM> comprises preferably an interface rim <NUM> having a second thickness and incorporating at least partially the second end region 101b of the tubular body <NUM>. Namely, the interface rim <NUM> forms preferably an interface between the two opposite portions of the tubular body <NUM> which are configured to be associated respectively with the portion 15a of the gas generator <NUM> and the inflatable element <NUM>.

In particular, preferably the second thickness of the interface rim <NUM> is greater than the first thickness of the side wall <NUM> so as to define an internal step <NUM> of the tubular body, namely a step directed towards the internal cavity <NUM> of the tubular body <NUM>. Even more particularly, preferably the vent channel <NUM> extends continuously in the interface rim <NUM> at least between the second end region 101b and the step <NUM>. In other words, the internal step <NUM> is defined by the difference in thickness between the second thickness of the interface rim <NUM> and the first thickness of the side wall <NUM> and in particular the internal step <NUM> preferably faces the inside of the tubular body <NUM>, namely is located in the internal cavity <NUM>.

In other words, preferably, the tubular body <NUM> of the bushing connection device <NUM> is divided essentially into at least two portions with a different thickness which interface with each other so as to define the internal step <NUM> with a height equal to the difference between the second thickness of the interface rim <NUM> and the first thickness of the side wall <NUM>. The vent channel <NUM> is confined preferably within the interface rim <NUM>. This embodiment has the advantage of a smaller extension of the vent channel, thus facilitating the production steps for formation of the vent channel.

In the embodiment shown in <FIG>, <FIG> and <FIG>, the vent channel <NUM> includes a through-hole <NUM> arranged in the interference rim <NUM> and open between a first opening 121a positioned in the second end region 101b, alongside the second mouth 110b, and a second opening 121b positioned in the internal step <NUM>. Namely the first opening and the second opening emerge or open out in the end region 101b and in the internal step <NUM>. The device is configured to allow venting of the inflation fluid by means of a passage across the through-hole and from the through-hole <NUM> towards the first mouth 110a, passing preferably across the internal cavity <NUM>, for example along an interstice or clearance formed between a wall of the portion 15a of the gas generator and the side wall <NUM> of the tubular body <NUM>.

In accordance with an alternative embodiment of the device shown for example in <FIG>, the vent channel <NUM> includes, in addition to the through-hole <NUM>, a groove <NUM> in the side wall facing the internal cavity <NUM> of the tubular body <NUM> and configured to be in fluid communication with the through-hole <NUM> of the vent channel <NUM> arranged in the interface rim <NUM>. Furthermore, preferably the groove <NUM> is formed along the inner surface of the side wall <NUM>, namely a surface of the side wall facing the internal cavity <NUM>, and furthermore the groove <NUM> extends preferably between the second opening 121b of the through-hole <NUM> and the first mouth 110a of the tubular body <NUM>.

In other words, the vent channel <NUM> may be formed by the through-hole <NUM>, arranged inside the interface rim <NUM> between the first opening 121a and the second opening 121b, and by the interspace formed between the side wall <NUM>, as shown in the embodiment of <FIG>, or by the through-hole <NUM>, arranged inside the interface rim between the first opening 121a and the second opening 121b, and by the groove <NUM>, arranged along the side wall <NUM> and extending preferably between the second opening 121b of the through-hole <NUM> and the first mouth 110a of the tubular body <NUM>, as in the embodiment of <FIG>.

Consequently, in the embodiment shown in <FIG>, <FIG> and <FIG>, the vent channel <NUM> is formed by the through-hole <NUM> and by the clearance formed between the side wall <NUM> and the gas generator <NUM>, and the side wall <NUM> does not have the groove <NUM>.

Preferably, the side wall <NUM> of the tubular body <NUM> comprises an L-shaped insertion seat <NUM> which extends from the first mouth 11a along the first end region 101a, namely along the side wall <NUM>. Preferably, moreover, the side wall <NUM> is shaped so as to allow a stable connection with the gas generator <NUM>, in particular with the portion 15a of the gas generator <NUM> configured to be removably associated with the bushing connection body <NUM>. For example, the side wall <NUM> has, at least along the surface facing the internal cavity, a form which mirrors that of the gas generator in such a way as to allow at least partial insertion of the gas generator <NUM> inside the internal cavity <NUM> in a stable manner. The connection between the gas generator <NUM> and the tubular body <NUM> does not obstruct the vent channel <NUM>.

Consequently, the bushing connection device <NUM> as described here in its embodiments, is also a venting device, namely a device which allows venting of the inflatable element so as to empty it at least partially of the inflation fluid.

As mentioned above, the bushing connection device <NUM> according to one of the embodiments described forms part of an inflation device comprising also the gas generator <NUM> configured to allow inflation of the inflatable element <NUM>. In particular, the portion 15a of the gas generator <NUM> is inserted in the internal cavity <NUM> from the side of the first mouth 110a and the portion 15a of the gas generator <NUM> leaves the vent channel <NUM> free for venting of the inflation fluid.

Preferably, in the embodiment shown in <FIG>, as mentioned above, the portion 15a of the gas generator <NUM> is inserted in the internal cavity <NUM> so as to adhere to a portion of the tubular body <NUM>, and the groove <NUM> forms a venting passage with a wall of the portion 15a of the gas generator <NUM>. Furthermore, the venting passage is preferably open towards the first mouth 110a.

Alternatively, and again preferably, as mentioned above, in the embodiment shown in <FIG>, <FIG> and <FIG>, the portion 15a of the gas generator <NUM> is inserted in the internal cavity <NUM> with play so as allow venting from the interface rim <NUM> towards the first mouth 110a. Namely, a wall of the portion 15a of the gas generator <NUM> forms a clearance thickness, i.e. allowing the passage of a fluid, with an inner surface of the inner wall <NUM> of the tubular body <NUM>, i.e. a surface facing the internal cavity.

In other words, the portion 15a of the gas generator <NUM> is configured in general to allow the passage of the venting fluid. For example, according to a first embodiment of the bushing connection device <NUM>, the portion 15a of the gas generator is inserted in the internal cavity <NUM> in an adhering manner and the inflation fluid may cross the groove <NUM> of the side wall <NUM> of the tubular body <NUM>. Alternatively, according to another embodiment of the bushing connection device <NUM>, the inflation fluid may move along an interspace or clearance thickness present between the portion 15a of the gas generator <NUM> and the side wall <NUM>.

In all the embodiments, as shown by way of example in <FIG>, the inflation device is completed by seals <NUM>, <NUM>. In particular, a first seal <NUM>, of the O-ring type or with a similar ring-like form, is arranged between the portion 15a of the gas generator <NUM> and the tubular body <NUM>, and a second seal <NUM>, also with a ring-like form, is arranged between the outer surface of the tubular body <NUM> and the inflatable element <NUM>.

With regard to the components of the personal protection device <NUM>, it is pointed out that the personal protection device <NUM> also comprises, in addition to the bushing connection device <NUM> according to one of the embodiments described above, the inflatable element <NUM> configured so as to be able to assume a deflated or rest configuration and an inflated or active configuration, namely a configuration in which it is able to protect at least partially a user of the device from blows or impacts. The personal protection device <NUM> also comprises a gas generator <NUM> configured to allow inflation of the inflatable element from the deflated configuration into the inflated configuration, for example by means of an outflow of pressurised gas from the gas generator <NUM> towards an inner chamber of the inflatable element <NUM> following a blow or impact. In particular, in addition the second mouth 110b of the bushing connection device <NUM> opens into the inner chamber of the inflatable element. In other words, when the inflatable element <NUM> is associated with the bushing connection device <NUM> the second mouth 110b leads into the inner chamber of the inflatable element <NUM>, so as to allow a fluid to pass from the internal cavity <NUM> of the tubular body <NUM> towards the inner chamber of the inflatable element <NUM>. Furthermore, the portion 15a of the gas generator <NUM> is inserted inside the internal cavity from the side of the first mouth 110a. Namely, the personal protection device <NUM> is structured in such a way that the portion 15a of the gas generator <NUM>, which is preferably configured for the outflow of gas, is removably associated with the first mouth 110a of the tubular body <NUM> and in such a way that the inflatable element is removably associated with the bushing connection device <NUM> at the second mouth 110b of the tubular body <NUM>, so as to allow fluid communication between the internal cavity <NUM> of the tubular body and the inner chamber of the inflatable element <NUM>.

According to one embodiment, such as that shown in <FIG>, the portion 15a of the gas generator <NUM> is inserted in the internal cavity <NUM> so as to adhere to at least a portion of the tubular body <NUM>, and the groove <NUM> forms a venting passage with a wall of the portion 15a of the gas generator <NUM>. Furthermore, the venting passage is preferably open towards the first mouth 110a.

In other words, the portion 15a of the gas generator <NUM>, which is preferably configured for the outflow of gas, adheres to at least a portion of the tubular body <NUM> and the groove <NUM> forms a venting passage - namely passage configured to allow the through-flow of a fluid - with a wall of the portion 15a of the gas generator <NUM>. In particular, the venting passage formed by the groove <NUM> preferably opens out towards the first mouth 110a. In other words, preferably the portion 15a of the gas generator <NUM> is inserted so as to mate at least partially with the inner surface of the tubular body <NUM>, in particular with the inner surface of the first end region 101a. In this way the outer wall of the portion 15a of the gas generator <NUM> adheres to or is adjacent to at least a portion of the inner surface of the tubular body <NUM> and defines together with the groove <NUM> a venting passage configured to allow fluid to pass through between the through-hole <NUM> arranged in the interface rim <NUM> and the first mouth 110a. Namely, preferably, when the gas generator <NUM> is removably associated with the bushing connection device <NUM>, a fluid is allowed to pass along a venting passage situated between the groove <NUM> and the outer wall of the portion 15a of the gas generator <NUM>.

According to an alternative embodiment, shown in <FIG>, <FIG> and <FIG>, the wall of the portion 15a of the gas generator <NUM> forms a venting thickness with the tubular body <NUM> inside the internal cavity <NUM>, so as to form a venting passage together with the through-hole <NUM>. Furthermore, the venting passage preferably open out towards the first mouth 110a. Namely the venting passage extends along the though-hole <NUM> formed in the interface rim <NUM> and along the interspace formed by the wall of the portion 15a of the gas generator <NUM> with the tubular body <NUM>.

Preferably, the inflatable element <NUM> comprises a connecting portion 12a which envelops or surrounds the tubular body <NUM> at least partially on one side. Namely, preferably the inflatable element <NUM> is removably associated with the tubular body <NUM> by means of the connecting portion 12a which is positioned so as to envelop and/or surround at least partially the tubular body <NUM> in the second end region 101b. Moreover, preferably, as shown by way of example in <FIG>, the personal protection device <NUM> comprises a sleeve <NUM> or a band-like element configured to be wrapped around the connecting portion 12a of the inflatable element <NUM> so as to keep said portion associated with the tubular body <NUM>, and for example consists of an elastic sleeve.

Preferably, the gas generator <NUM> comprises a pin-like component <NUM>, for example positioned along an outer wall of the generator.

In particular, the L-shaped insertion seat <NUM> of the side wall <NUM> of the tubular body <NUM>, described above, is configured to allow the insertion or passing movement of the pin-like component <NUM> inside it so as to removably associate the gas generator <NUM> together with the bushing connection device <NUM>. For example, the pin-like component <NUM> may be inserted along a first portion of the L-shaped insertion seat <NUM> by means of displacement of the gas generator <NUM> during insertion inside the internal cavity <NUM> of the tubular body <NUM>, and the pin-like component <NUM> may be inserted along a second portion of the L-shaped insertion seat <NUM> by means of rotation of the gas generator once inserted inside the internal cavity <NUM> of the tubular body <NUM>.

It is clear, therefore, that a fluid, for example an inflation gas, output from the portion 15a of the gas generator <NUM> may move along the internal cavity <NUM> of the tubular body <NUM> and enter into the inner chamber of the inflatable element <NUM> via the second mouth 110b, in such a way as to inflate the inflatable element into the inflated configuration. Subsequently, the inflation fluid may flow out of the inner chamber of the inflatable element via the vent channel <NUM>, exiting from the first mouth 110a.

In particular, the fluid may enter from the inner chamber of the inflatable element <NUM> into the through-hole <NUM>. Depending on the embodiment of the present invention, the fluid may cross the venting passage formed by the groove <NUM> and the outer wall of the portion 15a of the gas generator <NUM>, or the venting passage formed by the clearance present between the outer wall of the portion 15a of the gas generator <NUM> and the tubular body, and then exit from the internal cavity <NUM> of the tubular body <NUM> via the first mouth 110a, allowing therefore deflation of the inflatable element.

The present invention also relates to a connection method for connecting a gas generator <NUM> to an inflatable element <NUM>. The inflatable element <NUM> may form part of a personal protection device <NUM> such as that described above, preferably of the wearable type, according to any embodiment. In particular, the connection is such as to ensure fluid communication between the gas generator <NUM> and the inflatable element <NUM>. The method involves providing a bushing connection device <NUM> comprising a tubular body <NUM> extending between a first mouth 110a and a second mouth 110b and defining an internal cavity <NUM>. The method furthermore involves:.

In particular, in order to inflate the inflatable element <NUM>, the gas generator <NUM> emits a gas which passes from the second mouth 110b towards the inner chamber of the inflatable element <NUM>. Furthermore, in order to deflate the inflatable element <NUM>, the gas flows out via a vent channel extending between the first end region 101a and the second end region 101b. In particular, the vent channel <NUM> has a cross-section with a smaller area than the second mouth 110b, and preferably also than the first mouth 110a.

Preferably, according to the method, the gas may flow out of the inner chamber of the inflatable element <NUM> by means of the vent channel <NUM>, passing from a first opening 121a, positioned in the second end region <NUM> alongside the second mouth 110n, towards a zone alongside the first mouth 110a. For example, the zone alongside the first mouth 110a may be a tangential zone of the first mouth 110a, i.e. therefore located on an outer edge of the first mouth 110a.

Claim 1:
Personal protection device (<NUM>) comprising an inflatable element (<NUM>) and an inflation device, wherein the inflation device comprises a gas generator (<NUM>) and a bushing connection device (<NUM>) configured to connect said gas generator (<NUM>) with said inflatable element (<NUM>), wherein said bushing connection device (<NUM>) comprises a tubular body (<NUM>) extending between a first mouth (110a) and a second mouth (110b) and defining an internal cavity (<NUM>) able to house a portion (15a) of the gas generator (<NUM>) intended for the gas outflow,
wherein a first end region (101a) of the tubular body defines said first mouth (110a) and a second end region (101b) of the tubular body (<NUM>) defines said second mouth (110b), and wherein
said portion (15a) of the gas generator (<NUM>) is inserted into said internal cavity (<NUM>) from the side of said first mouth (10a) of the tubular body,
said inflatable element (<NUM>) is configured to be able to assume a deflated or rest configuration and an inflated or active configuration, wherein the gas generator (<NUM>) is configured to allow inflation of said inflatable element (<NUM>) from said deflated configuration into said inflated configuration, wherein said second mouth (110b) of the tubular body opens into the inner chamber of said inflatable element (<NUM>)
characterized in that said bushing connection device (<NUM>) further comprises a vent channel (<NUM>) extending along at least a portion of said tubular body (<NUM>) for venting an inflation fluid of said inflatable element (<NUM>), wherein said vent channel (<NUM>) has a cross-section with a smaller area than at least said second mouth (110b), and said portion (15a) of the gas generator (<NUM>) is configured to leave said vent channel (<NUM>) free to vent the inflation fluid.