EP3645383B1 - Diving gear - Google Patents

Description

FIELD OF THE INVENTION

The present invention relates to a diving device comprising an air pump with a rigid housing with an interior which extends along a longitudinal axis of the housing from an interior beginning to an interior end, and an opening arranged in a region of the interior end which is closed by a sack-like flexible part in order to form a variable pump volume limited by the housing and the flexible part, the air pump being designed in such a way that in the event of an overpressure caused by the surrounding water, the flexible part is pressed into the interior, reducing the pump volume and at least partially in a contact section of the Interior rests against an inner wall of the housing in order to compress air in the pump volume and to supply it to a diver from an area of the interior space beginning via a breathing line, the contact section extending along the longitudinal axis from the interior space end in the direction of the interior space beginning up to egg ner maximum height extends, wherein the flexible part can be pulled by muscle strength of the diver against the excess pressure and increasing the pump volume from the interior in order to suck in air via an air supply line from above a water level of the water.

STATE OF THE ART

Diving devices are known from the prior art which have an air pump that can be connected to the body of the diver and can be operated by muscle power, with the help of which air can be sucked in from the atmosphere and compressed, the compression being necessary even for shallow diving depths due to the water pressure . Such diving devices can be used for diving depths of up to approx. 10 meters and are characterized by a simple structure and easy-to-learn handling, whereby the diver can dive without further technical aids such as compressed air cylinders or compressors. In particular, the duration of the immersion is not limited by the further technical aids mentioned.

The closest prior art is that from EP 0297416 B1 view known diving device, which comprises an air pump with a rigid housing with an interior which extends along a longitudinal axis of the housing from an interior beginning to an interior end, and an opening which is arranged in a region of the interior end and which is closed by a sack-like flexible part, to form a variable pump volume limited by the housing and the flexible part, the air pump being designed in such a way that in the event of an overpressure caused by the surrounding water, the flexible part is pressed into the interior while reducing the pump volume and at least in sections in a contact section of the interior rests against an inner wall of the housing in order to compress air in the pump volume and to supply it to a diver from an area of the beginning of the interior via a breathing line, the contact section extending along the longitudinal axis from the end of the interior towards the beginning of the interior up to a maximum Height extends and wherein the flexible part by muscle strength of the diver against the overpressure and under Enlargement of the pump volume can be drawn from the interior in order to suck in air via an air supply line from above a water level of the water. However, this diving device has a number of disadvantages. In particular, it is provided in this diving device that the air supply line (as well as the breathing line) is to be connected to the housing in the area of the beginning of the interior space and is guided from there over the diver's shoulder. However, this means that tensile forces which act on the air supply line and which inevitably occur to a certain extent, since during diving the air supply line is connected at its end facing the atmosphere to a buoy floating on the water surface and the buoy from the diver is thus connected via the air supply line must be tightened when diving, do not attack the diver's center of gravity. The consequence of this is that the diver would be set into rotation by the tensile forces if he was not actively working against the initiation of the rotational movement by means of appropriate movements. In particular, when swimming forward, the diver is continuously pushed out of his ideal, preferably horizontal, diving position by pulling the diver's upper body upwards.

Another disadvantage of the known diving device can be seen in the fact that emergency situations can arise if the air supply line gets caught or tangled on an obstacle, for example if the diver dives through under the obstacle. It can be very difficult and tedious for the diver to get out of such a situation, which in connection with a possible panic of the diver can sometimes be life-threatening for the diver.

In the known diving device, a carrying device with shoulder straps is provided in order to fix the air pump in front of the diver's chest. However, this results in a further disadvantage, since when pulling out the flexible part The tensile forces to be applied, which become greater and greater with increasing diving depth, have to be absorbed or supported practically exclusively by the diver's shoulders. This is perceived by the diver as unpleasant, especially as the diving depth increases, and it reduces the diver's comfort and sometimes also the diving performance.

OBJECT OF THE INVENTION

It is therefore the object of the present invention to provide an improved diving device which avoids the disadvantages mentioned above. In particular, it should be ensured in the diving device according to the invention that tensile forces introduced via the air supply line do not lead to undesired rotation of the diver.

DISCLOSURE OF THE INVENTION

To achieve the stated object, it is in a diving device comprising an air pump with a rigid housing with an interior that extends along a longitudinal axis of the housing from the beginning of the interior to an interior end, and an opening arranged in a region of the interior end that passes through a bag-like The flexible part is closed in order to form a variable pump volume limited by the housing and the flexible part, the air pump being designed in such a way that, in the event of an overpressure caused by the surrounding water, the flexible part is pressed into the interior, reducing the pump volume, and at least in sections in a contact section of the interior rests against an inner wall of the housing in order to compress air in the pump volume and from an area of the interior space beginning via a breathing line To supply divers, the contact section extending along the longitudinal axis from the end of the interior in the direction of the beginning of the interior up to a maximum height, wherein the flexible part can be pulled out of the interior by muscular strength of the diver against the overpressure and increasing the pump volume, in order to supply air via an air supply line to suck in from above a water level of the water, according to the invention, that an air duct is provided which is designed in such a way that when sucking in the air from the area of the interior end towards the interior beginning at least up to an area of the maximum height, preferably into the area of the interior beginning , and can flow into the interior. Accordingly, a connection for the air supply line does not have to be provided in the area of the beginning of the interior, but can be provided in the area of the end of the interior, which is favorable with regard to the introduction of tensile forces close to the diver's center of gravity.

The fact that the housing is rigid does not, of course, rule out a certain - not least physically unavoidable - elastic deformability of the housing as a function of the action of a force. The rigidity of the housing is to be seen in particular in relation to the flexibility of the flexible part, wherein the flexible part could also be referred to as a (flexible) membrane or pump bellows. Both the housing and the flexible part can be made of suitable plastics in each case.

The opening is an opening of the interior through the housing to the outside, but in an operating state of the diving device the opening is closed by the flexible part. Typically, however, the flexible part can be removed for maintenance and cleaning purposes, the opening then being released and the diving device being in a maintenance state. When the diving device is in operation, it can be used to immerse in water, and then (if i.e. the diver with the diving device dives), there is also the fact that the diving device and the diver are surrounded by the water.

The limitation of the pump volume by the housing and the flexible part is to be understood in such a way that it cannot be ruled out that other elements are also necessary to completely limit the pump volume, for example check valves and / or at least a section of the air duct.

The area of the interior space end / interior space beginning is to be understood as a spatial area around the interior space end / interior space beginning which includes the interior space end / interior space beginning but is not necessarily limited to the interior space. Since compressed air is in any case in the interior, the compressed air is supplied to the diver in particular from that area of the interior which is in the area of the beginning of the interior or in the area around the beginning of the interior. As described, this supply takes place via a breathing line, which accordingly has to be fluidically connected to that area of the interior space that is in the area of the beginning of the interior space and is therefore usually connected to the housing in the area of the beginning of the interior space.

It is clear to the person skilled in the art that a suitable valve arrangement must be provided which ensures that air sucked in through the air supply line does not escape from the air supply line again when the flexible part is pressed into the interior. This can be achieved in particular with a first check valve, which could also be referred to as an air supply valve. It is also clear that the valve arrangement must enable the diver to inhale through the breathing line without the inhaled air being sucked out of his lungs again when the flexible part is pulled out of the interior. This can in particular by a second check valve can be achieved. In the example mentioned, both the first and the second check valve are loaded with the full pressure that is built up in the pump volume by the air compression and must withstand this. Finally, it is clear that the valve arrangement must also enable the diver to exhale the inhaled and used air into the surrounding water. Correspondingly, in the example mentioned, an exhalation valve for exhaling the air into the water can be provided in addition to the first and second check valve, the exhalation valve being exposed to a comparatively lower pressure load than the first and the second check valve.

With regard to an optimal function of the air pump or the diving device, it is advantageous if, if possible, there is no "unused" air pump volume in which the air is only compressed and relaxed again and not supplied to the diver. In order to make such an unused air pump volume as small as possible or even to avoid it entirely, the contact section should extend as far as possible over the interior space, preferably essentially over the entire interior space, and the flexible part should preferably be on the largest possible section of the interior wall substantially rest against the entire inner wall in the contact section when the flexible part is pressed into the interior. In the optimal case, the maximum height extends to the beginning of the interior. However, the function of the diving device is basically guaranteed even if the maximum height does not extend to the beginning of the interior space, although the diving device's performance may be somewhat weaker due to the unused pump volume then present.

An actuating device known per se can be provided so that the diver can pull the flexible part out of the interior again. The latter can in particular include leg straps with foot straps and connection means to connect the leg straps to the flexible part. In this case, the diver can pull the flexible part out of the interior by means of his legs. However, variants of the actuating device are also known where, as an alternative or in addition, grip elements are provided for the diver's hands so that the diver can at least partially pull the flexible part out of the interior with his arms.

The area of the maximum height is to be understood as a spatial area around the maximum height, which includes the maximum height but is not necessarily restricted to the interior space. If the area is not in the interior, however, the air is drawn from this area into the interior, so that, as specified, the air can flow into the interior. In other words, the air flows in any case up to the area of the maximum height, and if the air is not yet in the interior space, it flows from the area of the maximum height into the interior space. If the area of the maximum height is also in the interior, the feature according to which the air can flow into the interior is automatically fulfilled.

In principle, the most diverse design variants are conceivable which include the said air duct. For example, the air duct could be arranged outside the housing as an element separate from the housing. However, since such an air duct necessarily forms an element protruding from the housing, this is at least not conducive to the handiness of the diving device. In addition, the risk of an obstacle getting caught on the diving device, namely on the air duct, while diving is increased. In order to ensure that the handiness of the diving device is not impaired by the air duct, it is provided in a preferred embodiment of the diving device according to the invention that the housing is normally on the The longitudinal axis has a cross section and the air duct is arranged within the cross section.

In a particularly preferred embodiment of the diving device according to the invention, it is provided that the air duct is arranged inside the interior. In this case, the air duct can be implemented particularly simply by means of an additional element which is fundamentally separate from the housing and which is arranged in the interior, which technically sometimes greatly simplifies production.

Similarly, in a preferred embodiment of the diving device according to the invention, it is provided that the air duct is formed at least in sections, preferably completely, by a duct boundary wall separate from the housing. The channel boundary wall can take on the role of the above-mentioned separate element. If the flexible part is then pressed into the interior (i.e. in the case of the air duct being arranged in the interior), it inevitably comes into contact with the duct boundary wall in sections. In a certain way, the duct delimitation wall can be viewed as a spacer between a section of the inner wall of the housing and the flexible part in order to enable the unimpeded flow of air from the area of the inner space end to the area of the inner space beginning.

Furthermore, it can be provided that the channel delimitation wall is detachably attached to the housing, preferably in the interior. This enables the channel boundary wall to be removed for maintenance and cleaning purposes when the diving device is in the maintenance state.

In order to achieve a particularly high mechanical robustness, it is provided in a preferred embodiment of the diving device according to the invention that the air duct at least in sections, preferably completely, through the Housing is formed. In particular, a housing wall can be geometrically designed in such a way that the air duct is arranged within the cross section of the housing wall. This can also have advantages in terms of manufacturing technology, in that the housing including the air duct can be manufactured in one manufacturing step, for example by means of an injection molding process.

In a preferred embodiment of the diving device according to the invention it is provided that, seen in a direction parallel to the longitudinal axis, several openings arranged one behind the other are provided which fluidically connect the air duct to the interior space when the flexible part is pulled out of the interior space. The air duct could essentially also be formed by a grille, the openings being selected to be so large or small that the flexible part is not or only negligibly sucked in or through the opening or pushed through.

The mentioned design, in particular as a grid, can have hygienic advantages when washing out. In addition, due to the material savings through the openings, the diving device is comparatively lighter and thus enables the diving device according to the invention to be transported more comfortably. Furthermore, the material saving can lead to a certain saving in manufacturing costs.

The air duct enables a connection of the air supply line to be optimally positioned in order to establish a fluidic connection between the air supply line and the air duct and thus also with the interior space, without the diver rotating from an essentially horizontal to an upright position when the air supply line is subjected to tensile force comes. Correspondingly, in a preferred embodiment of the diving device according to the invention, there is a connection in the area of the interior end is provided for the air supply line. The connection does not necessarily have to connect directly to the air duct or be arranged on it, but can also be arranged on the housing. The latter can in particular be the case when the air duct is arranged within the cross section of the housing or within the interior space.

In order to enable a quick release of the air supply line, in particular from the housing, in emergency situations, it is provided in a particularly preferred embodiment of the diving device according to the invention that the connection for the air supply line is provided with a quick release for connection to the air supply line, the quick release in particular a Has a bayonet lock and / or a short thread and / or a sliding sleeve lock. The quick-release fastener is a connection known per se. For example, a sliding sleeve closure is well known as a garden hose connection and can enable the air supply line to be separated from the connection by simply pulling on or pushing the sliding sleeve. In general, however, a large number of known quick-release fasteners can be used, e.g. also a snap fastener that can be released via a button or a lever to be operated.

In a preferred embodiment of the diving device according to the invention, it is provided that a carrying device for the air pump is provided and designed in such a way that the air pump can be fixed in front of the diver's chest and that the air supply line is centered behind the diver's back, in particular on a hip belt of the carrying device, is releasably fastened. The fixation of the air pump, in particular the housing, in front of the diver's chest is desirable in order to have a slightly higher pressure of the surrounding water in the area of the air pump compared to the pressure of the surrounding water To ensure water in the area of the diver's lungs when the diver is in a typical diving position, ie in an approximately horizontal or slightly upright position with the belly pointing downwards. Accordingly, the air is then compressed by the air pump to a slightly increased pressure, which typically corresponds to a water column of 5 cm to 15 cm, which enables the diver to breathe in without problems.

By attaching the air supply line to the carrying device centrally behind the diver's back, the diver can always be optimally balanced, even if tensile forces occur on the air supply line. In particular, the air supply line cannot rotate and / or pull the diver to the side because tensile forces acting on the diver via the air supply line act near the diver's center of gravity - approximately opposite the diver's navel. In addition, there is ergonomically particularly favorable access to the connection, which is easily possible for the diver even with the diving device strapped in.

The provision of the air channel opens up a large number of possibilities for the positioning of the air supply valve or the first check valve, which go beyond the positioning in the area of the connection of the air supply line. In addition, said valve could theoretically also be arranged at any point in the entire course of the air supply line. In a preferred embodiment of the diving device according to the invention it is provided that a first check valve is provided for the air supply line, the first check valve being connected between at least one section of the air duct and the interior. With "switched" the functional arrangement is to be emphasized, which does not necessarily have to be identical to the spatial arrangement.

The first check valve preferably connects directly to the air duct.

The first check valve could, however, also be arranged in the middle of the air duct, where there is particularly good protection of the first check valve against external influences. It is particularly advantageous to position the first check valve in the air duct in the area of the beginning of the interior space, since the unused air pump volume can be minimized in this way.

In this regard, it should be noted that in the case of design variants in which the air duct is designed with openings or as a grille, an arrangement of the first check valve in the air duct usually does not make sense, since the first check valve can then not optimally fulfill its blocking function during air compression. In this case, an arrangement of the first check valve in connection with the air supply line is the preferred embodiment.

As already described, in emergency situations the diver can disconnect the air supply line from the connection, in particular by means of a quick-release fastener. According to the above, the diver is not always completely separated from the air supply line, but in preferred embodiments of the diving device according to the invention the air supply line is still connected to the carrying device in the area behind the diver's back. Since said area is difficult to reach for the diver, an automatic separation in emergency situations should be ensured according to the invention. In order to ensure an automatic separation of the air supply line from the carrying device, in particular after the connection of the air supply line with the associated connection has been separated by the diver, it is provided in a preferred embodiment of the diving device according to the invention, that for the releasable fastening of the air supply line in the middle behind the diver's back a quick release device is provided, which has a first displacement element which is attached to the air supply line, and a second displacement element which is attached to the carrying device, preferably on the hip belt, the first The displacement element and the second displacement element each have a complementary geometry that enables the two displacement elements to be pushed into one another in order to bring the two displacement elements into a connected state, the two displacement elements being displaceable relative to one another in at least one direction over a certain working range in the connected state before the two sliding elements can be converted into a released state by moving them further in this direction.

Depending on the specific geometry of the sliding elements, the sliding into one another can also include sliding onto one another.

The quick release device allows a certain amount of displacement of the two displacement elements without the displacement elements being separated. This is necessary in order to allow a certain, unavoidable movement between the carrying device and the air supply line attached to it during the normal diving process. A certain elasticity or deformability of the air supply line and of the body of the diver also contribute to this unavoidable movement. In the emergency situation described, however, there is a much larger displacement when the diver with the carrying device moves away from the air supply line tangled on an obstacle, so that the quick release device releases the connection between the air supply line and the carrying device.

Since the diver's direction of movement always clearly points away from the air supply line, this is basically sufficient Release when the displacement in exactly one specific direction exceeds a certain amount. As a result, the rapid release device can be manufactured very simply and inexpensively. Accordingly, in a particularly preferred embodiment of the diving device according to the invention, it is provided that the first displacement element is designed as a hook and the second displacement element as an eyelet or vice versa. Of course, other embodiments would also be conceivable, for example with a rail and a matching profile body, the rail having a stop which limits the displacement of the profile body and the rail relative to one another in one direction.

In addition, it should be noted quite generally that the profile body can of course also have a hook shape, at least in sections.

However, in this case, where a release only takes place with a sufficiently large displacement in exactly one specific direction, in order to ensure safety, care must be taken to ensure that the two displacement elements are correctly arranged relative to one another when the air supply line is attached to the carrying device. To increase the safety and comfort for the diver when putting on the diving device, it is provided in a particularly preferred embodiment of the diving device according to the invention that the two sliding elements in the connected state can be moved in two opposite directions over the working area relative to one another before the two sliding elements can be converted into the released state by further shifting in these directions.

In order to ensure a particularly simple implementation in terms of production technology, in particular in this case, it is provided in a particularly preferred embodiment of the diving device according to the invention that the first Sliding element is designed as a rail and the second sliding element as a profile body or vice versa.

Furthermore, embodiment variants are conceivable in which a sufficiently large displacement in one or more further directions which is / are not parallel to the two opposite directions also brings about a transition to the released state.

When diving with the diving device according to the invention, as the depth increases, due to the increasing overpressure from the surrounding water, an increasing tensile force must be applied in order to pull the flexible part out of the interior. At a depth of 5 m, this force can be around 450 N, for example. As stated above, this force is typically applied by the legs.

Via the carrying device, in particular via the shoulder straps of the carrying device, the tensile forces are essentially transferred to the diver's shoulders and from there to the upper area of the diver's back or chest / abdomen, which is the case with higher loads, i.e. greater depths, is perceived as unpleasant and can reduce comfort and diving performance.

In order to improve the diver's comfort and diving performance, a preferred embodiment of the diving device according to the invention provides that at least one stiffening element is provided in order to transfer tensile forces that act on the housing when the flexible part is pulled out of the interior into an area of the pool , in particular on the front side of the diver, the stiffening element being connected to the housing and protruding from the housing in the area of the interior end in an operating state of the diving device.

Through the stiffening element attached to the housing, the tensile forces occurring on the housing are at least partially - as compressive forces - directed into the area of the diver's hip or pelvis, the area usually being arranged on the front of the diver's body, since the air pump, in particular the Housing, as stated above, is usually fixed in front of the diver's chest. For anatomical reasons, namely due to the position of the lungs in the diver's body, the housing must be placed relatively high on the upper body in order to be as close as possible to the lungs and, if the diver changes position, a slight overpressure as constant as possible with the air pump to ensure air pressure generated due to the ambient overpressure compared to the ambient overpressure at the location of the diver's lungs. This ensures that the pressure of the air supplied to the diver's lungs is optimally adapted (i.e. slightly higher) to the overpressure caused by the surrounding water (in the area of the diver's lungs). However, this arrangement results in a certain distance between the housing and the diver's pelvis / hip area, which distance is bridged by the at least one stiffening element. Correspondingly, the stiffening element is arranged in such a way that, at least in the operating state, it points away from both the interior space end and the interior space beginning and extends at least in sections along the longitudinal axis of the housing.

The stiffening element can thus absorb the tensile forces acting on the housing as compressive forces and at least partially introduce them into mechanically robust areas of the diver's body or be supported on these areas, the area of the pubic bone in particular being mentioned here.

The stiffening element can preferably consist of a substantially rigid plastic in order to absorb the tensile forces to be able to transmit particularly efficiently. In order to increase the comfort of the diver, the stiffening element can also have cushioning elements (eg made of neoprene), in particular on sections that rest on the diver's body and press particularly strongly on the diver's body when the tensile forces are transmitted.

It should be emphasized that the stiffening element can be provided independently of the quick release device and / or the air duct. Accordingly, it is in a diving device comprising an air pump with a rigid housing with an interior space that extends along a longitudinal axis of the housing from an interior space beginning to an interior end, and an opening arranged in a region of the interior end which is closed by a sack-like flexible part in order to form a variable pump volume limited by the housing and the flexible part, the air pump being designed in such a way that in the event of an overpressure caused by the surrounding water, the flexible part is pressed into the interior, reducing the pump volume and at least partially in a contact section of the Interior rests against an inner wall of the housing in order to compress air in the pump volume and to supply it to a diver from an area of the interior beginning via a breathing line, the contact section extending along the longitudinal axis from the interior end in the direction of the interior beginning up to a maximum alen height, whereby the flexible part can be pulled out of the interior space by muscular strength of the diver against the overpressure and increasing the pump volume in order to suck in air via an air supply line from above a water level, according to the invention it is provided that at least one stiffening element is provided, in order to transmit tensile forces which act on the housing when the flexible part is pulled out of the interior into an area of the pool, in particular on the front side, of the diver can, wherein the stiffening element is connected to the housing and in an operating state of the diving device protrudes from the housing in the area of the interior end.

In order to be able to derive the tensile forces that occur even better into the diver's pelvis / hip area, a hip belt of the carrying device is provided, which is preferably designed to be particularly wide or high. In order to enable an optimal interaction of the hip belt with the at least one stiffening element and thus an optimal dissipation of the tensile forces occurring in the pelvis / hip area of the diver, it is provided in a particularly preferred embodiment of the diving device according to the invention that the at least one stiffening element with a hip belt a carrying device for the air pump can be connected.

In principle, the at least one stiffening element can have the most varied of shapes, as long as the stiffening element is only stiff enough to be able to absorb and transmit the compressive forces that occur. For example, the at least one stiffening element can be designed as struts and / or brackets. In a particularly preferred embodiment of the diving device according to the invention, it is provided that the at least one stiffening element is essentially plate-shaped. In addition to ensuring the necessary rigidity, this also enables the stiffening element to rest on the body in a comfortable manner for the diver.

As already described, the at least one stiffening element bridges the distance between the housing and the pelvis / hip area of the diver when the diver uses the diving device according to the invention. Correspondingly, the result is a length of the stiffening element which is comparable to a length of the housing, the lengths in the operating state in each case along the longitudinal axis of the Housing can be measured and are typically in the range of 20 cm to 40 cm. In order to enable better adaptation of the stiffening element to the body of the diver on the one hand and space-saving transport of the diving device according to the invention on the other hand, it is provided in a particularly preferred embodiment of the diving device according to the invention that the at least one stiffening element is pivotably attached to the housing. During transport, the at least one stiffening element can preferably be pivoted in such a way that it rests against the housing and does not protrude from it, in order to ensure a minimal length of the diving device according to the invention. The diving device according to the invention is then in a transport state.

A corresponding pivot axis of the stiffening element is arranged essentially normal to the longitudinal axis of the housing. In particular, the pivot axis can be parallel to a direction in which a width of the housing is measured. Correspondingly, in the case of a plate-shaped design of the stiffening element, the pivot axis then preferably lies in a plate plane of the stiffening element.

However, an arrangement of the pivot axis that is normal to the longitudinal axis of the housing and normal to the direction in which the width of the housing is measured would also be conceivable. Correspondingly, in the case of a plate-shaped design of the stiffening element, the pivot axis is then preferably arranged normal to the plate plane of the stiffening element. The pivot axis arranged in this way particularly preferably intersects the longitudinal axis of the housing.

It should be noted that it would also be conceivable to releasably fasten the at least one stiffening element to the housing, the stiffening element being detached from the housing in the transport state. However, the latter has compared to the variant with the pivotability of the stiffening element the disadvantage that the stiffening element can be lost more easily during transport.

BRIEF DESCRIPTION OF THE FIGURES

The invention will now be explained in more detail with reference to exemplary embodiments. The drawings are exemplary and are intended to explain the idea of the invention, but in no way restrict it or reproduce it conclusively.

Fig. 1

ein Tauchgerät gemäß dem Stand der Technik

Fig. 2

eine schematische teilweise aufgeschnittene Frontansicht eines Gehäuses einer Luftpumpe einer Ausführungsform eines erfindungsgemäßen Tauchgeräts

Fig. 3

eine schematische Querschnittsansicht des Gehäuses gemäß der Schnittlinie A-A aus Fig. 2, wobei die Pfeile die Blickrichtung andeuten

Fig. 4

eine Ansicht analog zu Fig. 3 einer weiteren Ausführungsform des erfindungsgemäßen Tauchgeräts

Fig. 5

eine Ansicht analog zu Fig. 3 einer weiteren Ausführungsform des erfindungsgemäßen Tauchgeräts

Fig. 6

eine Ansicht analog zu Fig. 3 einer weiteren Ausführungsform des erfindungsgemäßen Tauchgeräts

Fig. 7

eine Ansicht analog zu Fig. 3 einer weiteren Ausführungsform des erfindungsgemäßen Tauchgeräts

Fig. 8a bis Fig. 8d

unterschiedliche Ausführungsformen einer Schnellabwurfvorrichtung des erfindungsgemäßen Tauchgeräts, wobei ein erstes und ein zweites Verschiebeelement in einem verbundenen Zustand vorliegen

Fig. 9a und 9b

eine Detailansicht unterschiedlicher Ausführungsformen einer Schnellabwurfvorrichtung des erfindungsgemäßen Tauchgeräts, wobei das erste und das zweite Verschiebeelement in einem gelösten Zustand vorliegen

Fig. 10

eine schematische Frontansicht eines Gehäuses einer weiteren Ausführungsform des erfindungsgemäßen Tauchgeräts mit einem Versteifungselement

It shows:

Fig. 1

a diving device according to the state of the art

Fig. 2

a schematic partially cut-away front view of a housing of an air pump of an embodiment of a diving device according to the invention

Fig. 3

a schematic cross-sectional view of the housing according to the section line AA Fig. 2 , where the arrows indicate the direction of view

Fig. 4

a view analogous to Fig. 3 a further embodiment of the diving device according to the invention

Fig. 5

a view analogous to Fig. 3 a further embodiment of the diving device according to the invention

Fig. 6

a view analogous to Fig. 3 a further embodiment of the diving device according to the invention

Fig. 7

a view analogous to Fig. 3 a further embodiment of the diving device according to the invention

Figures 8a to 8d

different embodiments of a rapid release device of the diving device according to the invention, a first and a second Displacement element are in a connected state

Figures 9a and 9b

a detailed view of different embodiments of a quick release device of the diving device according to the invention, wherein the first and the second displacement element are in a released state

Fig. 10

a schematic front view of a housing of a further embodiment of the diving device according to the invention with a stiffening element

WAYS OF CARRYING OUT THE INVENTION

Fig. 1 shows a diving device 1 according to the prior art, as shown in FIG EP 0297416 B1 is revealed. In order to be able to suck in air from the atmosphere above a water level 23 when diving in water 22 and to be able to compress it to the pressure suitable for the respective depth under water 22, the diving device 1 comprises an air pump 2, which has a rigid housing 3 with an interior 4 (cf. . Fig. 2 ) and a sack-like flexible part 11. In an operating state of the diving device 1 in which the diving device 1 can be used for diving, the sack-like flexible part 11 closes an opening 8 of the interior 4. The interior 4 extends along a longitudinal axis 5 of the housing 3 from an interior beginning 6 to an interior end 7 , the opening 8 being arranged in a region 10 of the interior end 7 or around the interior end 7.

The housing 3 and the flexible part 11 thus limit a variable pump volume, the air pump 2 being designed in such a way that, in the event of an overpressure caused by the surrounding water 22, the flexible part 11 is pressed into the interior space 4 while reducing the pump volume and rests at least in sections in a contact section 12 of the interior 4 on an inner wall 13 of the housing 3 in order to compress air in the pump volume and to feed it from an area 9 of the interior 6 via a breathing line 16 to a diver 17. The contact section 12 of the interior space 4 extends along the longitudinal axis 5 from the interior space end 7 in the direction of the interior space beginning 6 up to a maximum height 18.

By means of a carrying device, which in the known embodiment of Fig. 1 consists essentially of two shoulder straps 24, the air pump 2, in particular the housing 3, is fixed in front of the diver's chest 17. For anatomical reasons, namely due to the position of the lungs in the body of the diver 17, the housing 3 is placed relatively high on the upper body in order to be arranged as close as possible to the lungs and, when the diver 17 changes position, a slight overpressure as constant as possible the air pump 2 due to the ambient overpressure generated air pressure compared to the ambient overpressure at the location of the lungs of the diver 17. This ensures that the pressure of the air supplied to the lungs of the diver 17 is optimally adapted to the overpressure caused by the surrounding water 22 (in the region of the lungs of the diver 17), namely the pressure of the air supplied to the lungs of the diver 17 is slightly is greater than the overpressure caused by the surrounding water 22 in the region of the diver's lungs 17.

To suck in the air from above the water level 23, an air supply line 19 is provided, which can be designed, for example, as a pressure hose known per se. According to Fig. 1 When diving, the air supply line 19 is attached to a buoy 25 by means of a hose connection 26, the air being able to flow via the buoy 25 into the air supply line 19. When the diver 17 swims under water 22, the buoy 25 is over the Air supply line 19 dragged along. In order to suck in air via the air supply line 19, the flexible part 11 is drawn out of the interior space 4 against the overpressure of the surrounding water 22 and with an increase in the pump volume, this being done by the muscular strength of the diver 17.

For this purpose, an actuating device is provided which, according to the prior art, can include leg straps 27 with foot straps 30 (for receiving the feet of the diver 17) as well as connection means in the form of a connecting buckle 28 to connect the leg straps 27 to the flexible part 11. In this case, the diver 17 can pull the flexible part 11 out of the interior space 4 by means of his legs. In order to adapt to the body size or leg length of the diver 17, the leg straps 27 each have a length adjustment 29 known per se, cf. Fig. 1 .

A suitable valve arrangement ensures that air sucked in through the air supply line 19 does not escape from the air supply line 19 again when the flexible part 11 is pressed into the interior space 4. This can be achieved in particular with a first check valve 14, which could also be referred to as an air supply valve, cf. Fig. 1 . Furthermore, the valve arrangement enables the diver 17 to inhale through the breathing line 16 without the inhaled air being sucked out of his lungs again when the flexible part 11 is pulled out of the interior space 4. This can be achieved in particular by a second check valve 15, cf. Fig. 1 . In the in Fig. 1 In the example shown, both the first check valve 14 and the second check valve 15 are loaded with the full pressure that is built up in the pump volume by the air compression and must withstand this. In particular, depending on the arrangement of the second check valve 15, the breathing line 16 can also be designed as a pressure hose known per se, preferably if the second Check valve 15 is arranged in the area of the mouth of the diver 17 (not shown). Finally, the valve arrangement also enables the diver 17 to exhale the inhaled and used air into the surrounding water 22. For this purpose, FIG Fig. 1 In addition to the first check valve 14 and the second check valve 15, an exhalation valve 43 is provided for exhaling the air into the water 22, the exhalation valve 43 being subjected to a comparatively lower pressure load than the first check valve 14 and the second check valve 15. 15, 43 are known per se.

Since the contact section 12 extends up to the maximum height 18, fluidic connections must be established between the air supply line 19 and the breathing line 16 on the one hand and the interior space 4 in an area from the area 21 of the maximum height 18 to the area 9 of the beginning 6 of the interior space. Otherwise, the fluidic connections between the air supply line 19 / the breathing line 16 and the interior space 4 would be interrupted when the flexible part 11 in the contact section 12 is in contact with the inner wall 13. If the maximum height 18 extends into the area 9 of the interior space beginning 6, then fluidic connections must be provided accordingly in the interior space 4 in the area 9 of the interior space beginning 6. According to the prior art, a connection 45 for the breathing line 16 and a connection 44 for the air supply line 19 are therefore provided on the housing in the area 9 of the beginning 6 of the interior space, cf. Fig. 1 . The first check valve 14 is arranged in connection 44 of the air supply line 19 and the second check valve 15 is arranged in connection 45 of the breathing line 16.

This leads, inter alia, to the fact that when swimming forward under water 22 tensile forces are introduced via the air supply line 19 which attempt to turn the diver 17 from an optimal horizontal position into an upright position. It also proves the position of the connection 44 of the air supply line 19 according to the prior art is unfavorable if the air supply line 19 has to be separated quickly from the connection 44 in emergency situations.

Fig. 2 shows a schematic, partially cut-open front view of a housing 3 of an air pump 2 of an embodiment of a diving device 1 according to the invention, in which this problem does not arise because the connection 44 of the air supply line 19 is arranged in the area 10 of the interior end 7 on the housing 3. Correspondingly, the air sucked in through the air supply line 19 must be able to flow from the connection 44, ie from the area 10 of the inner space end 7, at least to that area of the inner space 4 which is in the area 21 of the maximum height 18, preferably in the area 9 of the inner space beginning 6, in order to be able to be compressed there. This is made possible by an air channel 20 which ensures the fluidic connection of the air supply line 19 or the connection 44 in the area 21 of the maximum height 18 or in the area 9 of the interior space beginning 6 in the interior space 4, without the fluidic connection through the in the interior 4 pressed flexible part 11 can be interrupted. In other words, the air duct 20 is designed in such a way that when the air is sucked in, the air from the area 10 of the interior end 7 in the direction of the interior beginning 6 at least up to an area 21 of the maximum height 18, preferably as far as the area 9 of the interior interior 6, and into the interior 4 can stream.

A wide variety of design variants are now possible for such an air duct 20. In order to ensure that the handiness of the diving device 1 is not impaired by the air channel 20, it can be provided that the housing 3 has a cross section normal to the longitudinal axis 5 and the air channel 20 is arranged within the cross section. The Figures 3, 4 , 5 and 6 each show a schematic Cross-sectional view of the housing 3 along the section line AA (the arrows indicate the viewing direction) Fig. 2 for different embodiments of the diving device 1 according to the invention to which this applies.

In the variant of the Fig. 3 If the air duct 20 is completely formed by a duct delimitation wall 31 which is separate from the housing 3 and which also forms the connection 44.

In the design variants of the Fig. 5 and the Fig. 6 If the air duct 20 is only partially formed by the duct delimitation wall 31, namely on the one hand by the housing 3 and on the other hand by the duct delimitation wall 31. The housing 3 or a housing wall also forms the connection 44. The duct delimitation wall 31 forms a section of the air duct 20 opposite the connection 44.

In Fig. 5 the duct delimitation wall 31 - and thus at least in sections also the air duct 20 - is arranged within the interior 4, as also in FIG Fig. 3 . In Fig. 6 on the other hand, the duct delimitation wall 31 forms a continuation of the housing wall and thus delimits the interior space 4, ie the air duct 20 is arranged here at least in sections outside the interior space 20.

Fig. 4 shows an embodiment variant in which the air duct 20 is formed completely through the housing 3 or the housing wall. The same applies to the connection 44. Correspondingly, the air duct 20 is arranged within the mentioned cross section of the housing 3, but outside the interior 4.

In the Figures 3 , 5 and 6 The embodiment variants shown with the channel boundary wall 31, the flexible part 11 not only comes to rest on the inner wall 13, but also on the duct boundary wall 31 when the flexible part 11 is pressed into the interior space 4.

In the variant of the Fig. 7 the air duct 20 and the connection 44 are also formed by the duct delimitation wall 31, but the latter and the air duct 20 are arranged at least in sections outside the housing 3, which can be advantageous in terms of production.

It should be noted that the first check valve 14 does not necessarily always have to be positioned in the connection 44. The first check valve 14 can in principle also be arranged in the air supply line 19 or, if the air duct 20 itself is airtight, in the air duct 20 or between the air duct 20 and the interior space 4, in particular in the interior space 4 in the area 21 of the maximum height 18 or in the area 9 of the beginning of the interior 6 (not shown).

In preferred embodiments of the diving device 1 according to the invention it is further provided that the air supply line 19 is centered behind the back of the diver 17, in particular on a hip belt 40 (see, for example, FIG Figures 8a-d ) the carrying device, can be releasably fastened. Since the air supply line 19 is attached to the carrying device centrally behind the back of the diver 17, the diver 17 can always be optimally balanced, even if tensile forces occur on the air supply line 19. In particular, the air supply line 19 cannot rotate the diver 17 and / or pull it to the side because tensile forces acting on the diver 17 via the air supply line 19 act near the center of gravity of the diver 17 - approximately opposite the navel of the diver 17. In addition, there is ergonomically particularly favorable access to the connection 44, which is easily possible for the diver 17 even with the diving device 1 strapped on.

In emergency situations in which the air supply line 19 gets caught in an obstacle, it may be necessary for the diver 17 to separate from the air supply line 19 in order to be able to emerge. In order to enable the air supply line 19 to be separated quickly and easily from the connection 44, a known quick-release fastener (not shown) can be provided at the connection 44.

In order to enable a problem-free separation of the air supply line 19 from the carrying device centrally behind the back of the diver 17, an automatic separation by means of a quick release device 32 used for the detachable fastening is provided in preferred embodiments of the diving device 1 according to the invention, cf. Figures 8a-d as Figures 9a-b . It is provided that the quick release device 32 has a first displacement element that is attached to the air supply line 19, and a second displacement element that is attached to the carrying device, preferably on the hip belt 40, the first displacement element and the second displacement element each one to each other have complementary geometry that enables the two sliding elements to be pushed into one another in order to bring the two sliding elements into a connected state 37 (cf. Figures 8a-d ), with the two sliding elements in the connected state 37 being displaceable relative to one another in at least one direction over a certain working area 39 before the two sliding elements are moved further in this direction into a released state 38 (cf. Figures 9a-b ) are transferable.

The quick release device 32 thus allows a certain displacement of the two displacement elements without the displacement elements being separated. This is necessary for a certain, unavoidable movement between the carrying device and the during normal diving to allow attached air supply line 19. In the emergency situation described, however, there is a much larger displacement when the diver 17 with the carrying device moves away from the air supply line 19 entangled in an obstacle, so that the quick release device 32 releases the connection between the air supply line 19 and the carrying device.

Since the direction of movement of the diver 17 always clearly points away from the air supply line 19, the release is basically sufficient if the displacement in exactly one specific direction exceeds a certain amount. As a result, the rapid release device 32 can be manufactured very simply and inexpensively. Accordingly, in a particularly preferred embodiment of the diving device 1 according to the invention, it is provided that the first displacement element is designed as a hook 33 and the second displacement element as an eyelet 34 or vice versa. Figure 8a shows a variant in which the first displacement element, which is connected to the air supply line 19, is designed as a hook 33 and the second displacement element, which is connected to the hip belt 40, as an eyelet 34 a free end of the hook 33 and a closed end of the hook 33 are defined, the release is only in one direction. The latter would be the case if the diver 17 or the hip belt 40 are in Figure 8a would move to the right so far that the eyelet 34 would slide off the free end of the hook 33. In contrast, if the hip belt 40 were moved to the left, there would be no transfer to the released state 38, since the eyelet 34 would strike the closed end of the hook 33.

Figure 8b shows the reverse case, where the hook 33 is fixed to the hip belt 40 and the eyelet 34 to the Air supply line 19, the analogous to the Figure 8a What has been said applies.

It should be noted that the hook 33 ( Figure 8a ) or the eyelet 34 ( Figure 8b ) can be moved accordingly along the air line 19 before the hook 33 ( Figure 8a ) or the eyelet 34 ( Figure 8b ) is fixed to the air line 19.

With the design variants of the Figures 8a and 8b , where a release only takes place in the event of a sufficiently large displacement in exactly one specific direction, care must be taken to ensure the correct arrangement of the two displacement elements to one another, ie the respective hook 33 to the respective eyelet 34, when the air supply line 19 is connected to the Carrying device or the hip belt 40 is attached.

In order to increase the safety and comfort for the diver 17 when putting on the diving device 1, it is provided in a particularly preferred embodiment of the diving device 1 according to the invention that the two displacement elements in the connected state 37 can be displaced relative to one another in two opposite directions over the working area 39, before the two displacement elements can be transferred into the released state 38 by further displacement in these directions. For example, the first displacement element can be designed as a rail 35 and the second displacement element as a profile body 36 or vice versa, with the profile body 36 being able to be pushed onto the rail 35 at both ends.

Figure 8c shows a case in which the first displacement element is designed as a profile body 36 and the second displacement element as a rail 35, but the rail 35 has a stop 50 at one end, so that a situation analogous to the exemplary embodiments of FIG Figures 8a and 8b results. Due to its geometry complementary to the rail geometry, the profile body 36 can be pushed onto the rail 35 in order to produce the connected state 37, but only at that - free - end of the rail 35 that is not provided with the stop 50. In the connected state 37, the profile body 36 can then be moved along the entire course of the rail 35 without the connected state 37 being canceled. That is, the course of the rail 35 defines the working area 39. A detachment of the profile body 36 from the rail 35 is only possible here by a sufficiently large displacement in one direction. The latter leads to a dissolution of the connected state 37 and establishes the released state 38. Ie if in Figure 8c the hip belt 40 were shifted far enough to the right, this would lead to the transfer to the released state 38. Figure 8d shows the reverse case, where the profile body 36 is fixed on the hip belt 40 and the rail 35 with stop 50 on the air supply line 19, the analogous to FIG Figure 8c What has been said applies.

It should be noted that the profile body 36 ( Figure 8c ) or the rail 35 ( Figure 8d ) can be shifted accordingly along the air line 19 before the profile body 36 ( Figure 8c ) or the rail 35 ( Figure 8d ) is fixed to the air line 19.

Figure 9a shows an example of a rail 35 and a profile body 36 in the released state 38. The rail 35 has a negative profile in the form of a recess with an essentially U-shaped cross-section with ends of the legs of the U-shape facing each other, in which the profile body 36 with a positive profile with a substantially T-shaped cross-section can be inserted laterally in order to produce the connected state 37. That is, in the connected state 37, the profile body 36 is in engagement with the rail 35. Due to the complementary geometries of the rail 35 and the profile body 36, the profile body 36 in the connected state 37 can only be moved along the course of the rail 35, but not approximately perpendicular to the course of the rail 35. The rail 35 here has two free ends - without a stop 50 - so that a Transfer from the connected state 37 to the released state 38 is possible by sufficiently large displacement of the profile body 36 along the rail 35 in two opposite directions.

Figure 9b shows a completely analogous embodiment, in which, however, the rail 35 has a positive profile with a substantially T-shaped cross section and the profile body 36 has a negative profile with a substantially U-shaped cross section with ends of the legs of the U shape pointing towards one another. The profile body 36 can correspondingly be pushed laterally onto the rail 35 - at both free ends - in order to produce the connected state 37. Again, due to the complementary geometries of the rail 35 and the profile body 36, the profile body 36 in the connected state 37 can only be displaced along the course of the rail 35, but not approximately perpendicular to the course of the rail 35. A transfer from the connected state 37 to the released state 38 is possible by sufficiently large displacement of the profile body 36 along the rail 35 in two opposite directions.

Fig. 10 shows a further preferred embodiment of the diving device 1 according to the invention with a stiffening element 41, which is provided for tensile forces that act on the housing 3 when the flexible part 11 is pulled out of the interior 4, as compressive forces in an area of the basin on the front of the diver 17 to be able to transmit, wherein the stiffening element 41 is connected to the housing 3 and protrudes from the housing 3 in the area 10 of the interior end 7 in the operating state of the diving device 1.

The stiffening element 41 according to Fig. 10 is plate-shaped with a trapezoidal geometry which is symmetrical to the longitudinal axis 5 and tapers slightly in a direction parallel to the longitudinal axis 5 and pointing away from the housing 3. The relatively small degree of tapering has the effect that a width of the stiffening element 41, which is measured in the plane of the drawing and normal to the longitudinal axis 5, is also large enough at a lower, free end 47 of the stiffening element 41 to withstand compressive forces for the diver 17 Conveniently to be transferred to the area of the hip or the pelvis, in particular in the area of the pubic bone, of the diver 17. However, other geometries of the stiffening element 41 which achieve this would also be conceivable, for example a rectangular geometry which is in particular symmetrical to the longitudinal axis 5.

For the stiffening element 41, at least one known connecting element 42 is provided, with which the stiffening element 41 with the hip belt 40, which is shown in FIG Fig. 10 is only indicated dotted, can be connected in order to enable an even better transfer of the pressure forces to the area of the pelvis or the hip of the diver 17 by means of the hip belt 40. The at least one connecting element 42 can for example comprise at least one buckle or at least one pressure fastener or at least one rivet fastener, etc. The at least one connecting element 42 can comprise corresponding parts on the stiffening element 41 and on the hip belt 40. As the at least one connecting element 42, however, a pocket (not shown), for example, can also be attached to the hip belt 40, into which the stiffening element 41 is inserted in order to establish the connection to the hip belt 40 and to be able to transmit compressive forces to the hip belt 40.

In order to ensure optimal power transmission into the area of the pubic bone of the diver 17, a length of the stiffening element 41 measured along the longitudinal axis 5 is dimensioned such that the free end 47 projects beyond a lower edge 48 of the hip belt 40 with a certain protrusion 49. In the representation of the Fig. 10 the free end 47 is arranged correspondingly below the lower edge 48, with the protrusion 49 as the distance between the free end 47 and the lower edge 48. One in Fig. 10 Downward pressure load, which is transmitted by the stiffening element 41, can in this way be converted into a kind of tilting load or tilting movement of the stiffening element 41, so that the stiffening element 41 with a component pointing into the plane of the drawing in the area of the pubic bone of the diver 17 against it Body presses.

All of the above-mentioned connecting elements 42 allow such a dimensioning and arrangement of the stiffening element 41.

Like the housing 3, the stiffening element 41 can also be made from a substantially rigid plastic.

In order to enable, on the one hand, a better adaptation of the stiffening element 41 to the body of the diver 17 and, on the other hand, a space-saving transport of the diving device 1 according to the invention, the stiffening element 41 is in the embodiment of FIG Fig. 10 attached to the housing 3 so as to be pivotable about a pivot axis 46.

During transport, the stiffening element 41 can thus be pivoted by approx. 180 ° (in Fig. 10 to the top) that it rests on the housing 3 and does not protrude from it, in order to ensure a minimal length of the diving device 1 according to the invention. The diving device 1 according to the invention is then in a transport state.

The pivot axis 46 of the stiffening element 41 is arranged essentially normal to the longitudinal axis 5 of the housing 3. In particular, the pivot axis 46 can be arranged parallel to a direction in which a width of the housing 3 is measured, such a pivot axis 46 in FIG Fig. 10 is shown and in the plane of the drawing Fig. 10 lies. The plane of the drawing in turn coincides with a plate plane of the plate-shaped stiffening element 41.

However, it should be emphasized that other arrangements of the pivot axis 46 are also possible, in particular an arrangement of the pivot axis 46 normal to the longitudinal axis 5 and normal to the direction in which the width of the housing 3 is measured. A pivot axis 46 arranged in this way would be normal to the plane of the drawing Fig. 10 stand. A pivot axis 46 arranged in this way can preferably intersect the longitudinal axis 5.

REFERENCE LIST

1

Diving equipment

2

Air pump

3

casing

4th

inner space

5

Longitudinal axis of the housing

6th

Interior beginning

7th

Interior end

8th

Opening of the interior

9

Area of the interior beginning

10

Area of the inner dream end

11

Flexible part

12th

Plant section of the interior

13th

Inner wall

14th

First check valve

15th

Second check valve

16

Breathing line

17th

Diver

18th

Maximum height of the investment section

19th

Air supply line

20th

Air duct

21

Area of the maximum height of the system section

22nd

water

23

Water level

24

Shoulder strap

25th

buoy

26th

Hose connection

27

Leg strap

28

Connecting buckle

29

Length adjustment

30th

Foot strap

31

Separate duct partition wall

32

Quick release device

33

hook

34

eyelet

35

rail

36

Profile body

37

Connected state

38

Dissolved state

39

Workspace

40

Waist belt

41

Stiffening element

42

Connecting element for the stiffening element

43

Exhalation valve

44

Connection for the air supply line

45

Connection for the breathing line

46

Swivel axis

47

Free end of the stiffening element

48

Lower edge of the hip belt

49

Got over

50

attack

Claims (15)

1. Diving apparatus (1) comprising an air pump (2) having a rigid housing (3) with an interior space (4), which extends along a longitudinal axis (5) of the housing (3) from an interior-space beginning (6) to an interior-space end (7) and, disposed in a region (10) of the interior-space end (7), an opening (8), which is closed by a bag-like flexible part (11) in order to form a variable pump volume, which is bounded by the housing (3) and the flexible part (11), wherein the air pump (2) is designed in such a way that, in the event of an overpressure caused by surrounding water (22), the flexible part (11) is pressed into the interior space (4), with reduction of the pump volume and abuts at least in portions upon an inner wall (13) of the housing (3) in a contact portion (12) of the interior space (4), in order to compress air in the pump volume and to supply it from a region (9) of the interior-space beginning (6) via a breathing line (16) to a diver (17), wherein the contact portion (12) extends along the longitudinal axis (5) from the interior-space end (7) in the direction of the interior-space beginning (6) up to a maximum height (18), wherein the flexible part (11) can be pulled out of the interior space (4) against the overpressure by muscle power of the diver (17) and with increase of the pump volume, in order to suck in air via an air-supply line (19) from above a water level (23) of the water (22), characterized in that an air duct (20) is provided, which is designed in such a way that, during the suction, the air is able to flow from the region (10) of the interior-space end (7) in the direction of the interior-space beginning (6) at least into a region (21) of the maximum height (18), preferably into the region (9) of the interior-space beginning (6), and into the interior space (4).
2. Diving apparatus (1) according to claim 1, characterized in that the housing (3) has a cross section normal to the longitudinal axis (5) and the air duct (20) is disposed inside the cross section.
3. Diving apparatus (1) according to claim 2, characterized in that the air duct (20) is disposed inside the interior space (4) .
4. Diving apparatus (1) according to one of claims 1 to 3, characterized in that the air duct (20) is constructed at least in portions, preferably completely, by a duct-bounding wall (31) separate from the housing (3).
5. Diving apparatus (1) according to one of claims 1 to 4, characterized in that the air duct (20) is constructed at least in portions, preferably completely, by the housing (3) .
6. Diving apparatus (1) according to one of claims 2 to 5 and according to claim 2, characterized in that, viewed in a direction parallel to the longitudinal axis (5), several openings are provided in a manner disposed one after the other and connect the air duct (20) fluidically with the interior space (4), when the flexible part (11) is pulled out of the interior space (4).
7. Diving apparatus (1) according to one of claims 1 to 6, characterized in that a port (44) for the air-supply line (19) is provided in the region (10) of the interior-space end (7).
8. Diving apparatus (1) according to one of claims 1 to 7, characterized in that a carrying device (24) is provided for the air pump (2) and is designed in such a way that the air pump (2) can be fixed in front of the chest of the diver (17) and that the air-supply line (19) can be detachably fastened centrally behind the back of the diver (17), especially on a hip strap (40) of the carrying device.
9. Diving apparatus (1) according to one of claims 1 to 8, characterized in that a first check valve (14) is provided for the air-supply line (1), wherein the first check valve (14) is interconnected between at least one portion of the air duct (20) and the interior space (4).
10. Diving apparatus (1) according to one of claims 7 to 9 and according to claim 7, characterized in that the port (44) for the air-supply line (19) is equipped with a quick-lock fitting for connection to the air-supply line (19), wherein the quick-lock fitting has in particular a bayonet fitting and/or a short-flight thread and/or a sliding-sleeve fitting.
11. Diving apparatus (1) according to one of claims 8 to 10 and according to claim 8, characterized in that, for detachable fastening of the air-supply line (19) centrally behind the back of the diver (17), a quick-release fitting (32) is provided, which has a first sliding element (33, 34; 35, 36), which is fastened on the air-supply line (19), and a second sliding element (34, 33; 36, 35), which is fastened on the carrying device, preferably on the hip strap (40), wherein the first sliding element (33, 34; 35, 36) and the second sliding element (34, 33; 36, 35) respectively have a mutually complementary geometry, which permits sliding of the two sliding elements (33, 34; 35, 36) into one another, in order to bring the two sliding elements (33, 34; 35, 36) into a condition (37) connected to one another, wherein the two sliding elements (33, 34; 35, 36) in the connected condition (37) are capable of sliding in at least one direction relative to one another over a certain working range (39), before the two sliding elements (33, 34; 35, 36) can be converted into a detached condition (38) by further sliding in this direction.
12. Diving apparatus (1) according to claim 11, characterized in that the two sliding elements (33, 34; 35, 36) in the connected condition (37) are capable of sliding relative to one another in two opposite directions over the working range (39), before the two sliding elements (33, 34; 35, 36) can be converted to the detached condition (38) by further sliding in these directions.
13. Diving apparatus (1) according to one of claims 11 to 12, characterized in that the first sliding element is constructed as a rail (35) and the second sliding element as a profile member (36) or vice versa.
14. Diving apparatus (1) according to claim 11, characterized in that the first sliding element is constructed as a hook (33) and the second sliding element as an eye (34) or vice versa.
15. Diving apparatus (1) according to one of claims 1 to 14, characterized in that at least one stiffening element (41) is provided in order to be able to transfer pulling forces that act on the housing (3) during pulling of the flexible part (11) out of the interior space (4) into a region of the pelvis of the diver (17), especially on the front side, wherein the stiffening element (41) is connected to the housing (3) and in an operating condition of the diving apparatus (1) protrudes from the housing (3) in the region (10) of the interior-space end (7), wherein the at least one stiffening element (41)

    - particularly, can be connected to a hip strap (40) of a carrying device for the air pump (2), and/or

    - particularly, is constructed substantially in the form of a plate, and/or

    - particularly, is fastened pivotally on the housing (3).

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