Spring bridge for a spring bridge bag plate system of a closed-circuit breathing apparatus, spring bridge bag plate system and closed-circuit breathing apparatus

Description

[0001] The present invention relates to a spring bridge for a spring bridge-breathing bag plate system of a closed-circuit breathing apparatus, comprising a spring bridge support for arranging at least one spring element of a spring bridge-breathing bag plate system and comprising at least one fastening element for holding the spring bridge on the closed-circuit breathing apparatus. The invention further relates to a spring bridge-breathing bag plate system for a closed-circuit breathing apparatus, comprising a breathing bag plate, a spring bridge, and at least one spring element arranged between the breathing bag plate and the spring bridge. Furthermore, the invention relates to a closed-circuit breathing apparatus, comprising a housing with a lower housing part and an upper housing part, a CO2 absorber, an oxygen cylinder, and a spring bridge-breathing bag plate system. STATE OF THE ART

[0002] Closed-circuit breathing apparatus or ventilation systems for emergency or long-term patient ventilation typically contain breathing bags, also called counterlungs, of various designs and modes of action. These counterlungs or breathing bags are flexible volumes that facilitate breathing under difficult conditions or in harmful environments.

[0003] Common to all breathing bags is the principle of absorbing a quantity of gas by unfolding or inflating the gas-enclosed envelope and releasing a quantity of gas by folding or collapsing it. This periodic movement can be achieved actively, for example, by auxiliary devices, or passively by adding and removing volume.

[0004] Such auxiliary units can, for example, be spring systems of various designs. Compression or tension springs can be used. In each case, the corresponding spring system supports the collapse or folding of the breathing bag. The breathing bag, in conjunction with a suitable breathing bag plate, forms the first mechanical counterbearing of the spring system. The second counterbearing, also known as the spring seat, is usually a U-shaped fixed component in the closed-circuit breathing apparatus, often referred to as a spring bridge. This spring bridge provides support when compression springs are used or suspension when tension springs are used. The spring force acting on the breathing bag plate and thus on the breathing bag surface creates a constant overpressure inside the gas-enclosure envelope, i.e. inside the breathing bag and the entire breathing circuit system.This overpressure promotes and facilitates inhalation of the breathing gas and at the same time protects the user of the breathing circuit system from the penetration of harmful substances due to the direction of pressure.

[0005] The breathing bag also serves as a collection volume or active gas reservoir for the exhaled air purified of carbon dioxide. Due to the fact that the breathing bag is in contact with the breathing gas on the inside and with the often toxic environment on the outside, regular cleaning and disinfection of the breathing bag is necessary. It is therefore important and necessary to clean and disinfect the breathing bag after each use of the breathing circuit system. This usually requires removing the corresponding parts or components on the periphery of the breathing bag. The corresponding spring system, depending on how it is connected to the breathing bag, must also be removed. In addition, most closed-circuit breathing apparatus have a mechanical guidance system and / or pneumatic connecting elements, which must also be dismantled for the cleaning and disinfection process.Due to the typically limited space within closed-circuit breathing apparatus, disassembly and assembly of the breathing circuit is very complex and very time-consuming and difficult for inexperienced users.

[0006] The starting point for the invention is the breathing bag spring bridge design of the applicant's closed-circuit breathing apparatus, which is used primarily for mine rescue, but also by firefighters, particularly during long-term operations. This closed-circuit breathing apparatus features attachment points on the upper part of the breathing bag for attaching a breathing bag plate, which serve as a counterbearing and force distribution for corresponding compression springs for the internal overpressure.

[0007] In Fig. 1A spring bridge breathing bag plate system (80) of the applicant's closed-circuit breathing apparatus (1000) is shown schematically in a sectional view. The closed-circuit breathing apparatus (1000) has a housing (1020) with a lower housing part (1040) and an upper housing part (1060). The breathing bag (210) has a smaller upper side (212) and a larger lower side (214). Also shown are the connections and sleeves (216) for connecting the breathing bag (210) to a carbon dioxide absorber and a breathing gas cooler unit.

[0008] The connecting sleeves (216) must be stretched considerably by hand to connect them to the other components so that a corresponding undercut in the sleeve (216) fits into a corresponding groove geometry in the corresponding component. On the top side (212) of the breathing bag (210) there are attachment points for a pressure plate (218), the so-called breathing bag plate (218), which in turn serves as a counter bearing and seat for the compression springs (282). The compression springs (282), in interaction with the breathing bag plate (218), generate a constant overpressure in the breathing bag (210) due to their surface area and force. Due to the direction of the pressure, this prevents the penetration of contaminants and thus protects the device wearer during breathing. The second counter bearing for the two compression springs (282) is the so-called spring bridge (240). In this closed-circuit breathing apparatus (1000), this is firmly, i.e. non-detachably, connected to the lower part of the housing (1040).Installation position and peripherals are in the . Fig. 1 To disassemble the breathing bag (210), for example, after use of the closed-circuit breathing apparatus (1000) in preparation for cleaning and disinfection, the compression springs (282) must be removed. This is done by compressing the compression springs (282).

[0009] Disadvantages of this closed-circuit breathing apparatus (1000) are that, over the course of its lifetime, various defects repeatedly occur in various components of the breathing circuit, particularly the breathing bag (210). This is due, on the one hand, to the technical design and, on the other hand, to the installation position of the breathing bag (210) in the closed-circuit breathing apparatus (1000), as well as the need to install and remove the breathing bag (210) from the closed-circuit breathing apparatus (1000) for cleaning and disinfection. Very frequently, a minimum valve (not shown) located on the breathing bag (210) is damaged during installation and disassembly of the breathing bag (210). A deformed valve lever is usually the result of difficulties during installation and removal of the breathing bag (210). The breathing bag (210) itself is also easily damaged. This is due, among other things, to the limited space and connection principles.Because the spring bridge (240) is a permanently installed component on the lower device housing (1020), it does not allow for barrier-free working inside the closed-circuit breathing apparatus (1000). To access the compression springs (282) between the breathing bag (210) and the spring bridge (240), some, preferably all, other components must first be removed from the device interior, as the freedom of movement for a technician's hands is very limited. Once an absorber and a breathing air cooler of the closed-circuit breathing apparatus (1000) have been removed, the breathing bag (210) can be removed by removing the minimum valve. A further disadvantage is the need to dismantle the breathing bag guide. This metal lever is attached directly to the breathing bag plate (218) at one end using a snap fastener and is movably mounted outside the spring bridge-breathing bag plate system on the opposite side.

[0010] Due to extensive deployment scenarios, it is often necessary to disassemble, clean, and then reassemble and test numerous closed-circuit breathing apparatus. This typically occurs in large fire department operations with large numbers of personnel required to deploy closed-circuit breathing apparatus. Due to the hazardous situation and the limited number of closed-circuit breathing apparatus, it is often necessary to prepare used closed-circuit breathing apparatus for reuse as quickly as possible. With the applicant's closed-circuit breathing apparatus described above, this can only be accomplished by highly qualified and trained personnel. All of the steps involved are unlike those performed in everyday life. Intuitive use and operation are therefore virtually impossible.

[0011] WO2012 / 073024 A2 discloses a spring bridge that is releasably attached to a housing section of a breathing apparatus.

[0012] Based on this prior art, the invention is based on the object of at least partially remedying these disadvantages of spring bridge breathing bag plate systems of a closed-circuit breathing apparatus and thus of a closed-circuit breathing apparatus. It is therefore the object of the present invention to provide a spring bridge for a spring bridge breathing bag plate system of a closed-circuit breathing apparatus, a spring bridge breathing bag plate system for a closed-circuit breathing apparatus, and a closed-circuit breathing apparatus that enable the simple and rapid assembly and disassembly of a breathing bag of a closed-circuit breathing apparatus for cleaning purposes. In particular, a reduced number of individual parts and more space for maintenance procedures are to be created within the closed-circuit breathing apparatus in the area of ​​the spring bridge breathing bag plate system. DISCLOSURE OF THE INVENTION

[0013] The above object is achieved by a spring bridge for a spring bridge breathing bag plate system of a closed-circuit breathing apparatus having the features of claim 1, by a spring bridge breathing bag plate system for a closed-circuit breathing apparatus having the features of claim 9, and by a closed-circuit breathing apparatus having the features of claim 13. Further features and details of the invention emerge from the subclaims, the description, and the drawings. Features and details described in connection with the spring bridge according to the invention naturally also apply in connection with the spring bridge breathing bag plate system according to the invention and the closed-circuit breathing apparatus according to the invention, and vice versa, so that with regard to the disclosure of the individual aspects of the invention, reference is or can always be made reciprocally.

[0014] According to the present aspect of the invention, the object is achieved by a spring bridge for a breathing bag of a closed-circuit breathing apparatus, comprising a spring bridge support for arranging at least one spring element of a spring bridge-breathing bag plate system and comprising at least one fastening element for holding the spring bridge on the closed-circuit breathing apparatus. Furthermore, the at least one fastening element is a rotating element and / or sliding element for rotating and / or sliding the spring bridge on and relative to the closed-circuit breathing apparatus, wherein the spring bridge is rotatable and / or displaceable by means of the rotating element and / or the sliding element from an operating position into an open position to provide access to a breathing bag of the closed-circuit breathing apparatus.

[0015] A spring bridge of this type in a spring bridge-breathing bag plate system for a closed-circuit breathing apparatus enables simple and quick assembly and disassembly of a breathing bag of a closed-circuit breathing apparatus arranged below the spring bridge. Due to the special design of the at least one fastening element as a rotating element and / or as a sliding element, the spring bridge held on a closed-circuit breathing apparatus can be very easily rotated and / or moved from a working position to an opening position in order to provide access to the breathing bag. In the working position, the spring bridge serves as a counterbearing for spring elements arranged between the spring bridge and the breathing bag. This means that in the working position, the spring bridge supports the compression springs or tension springs. In the working position, the spring bridge is immovably mounted, preferably locked, on the closed-circuit breathing apparatus.

[0016] Preferably, the spring bridge is arranged parallel to the top of the breathing bag within the closed-circuit breathing apparatus in the working position. This allows the spring elements of the spring bridge-breathing bag plate system supported on the spring bridge to exert a spring force on the breathing bag. Due to the design of the fastening element as a rotating element and / or sliding element, the spring bridge can be transferred from the working position to a so-called opening position by a rotating and / or sliding movement. This means that the spring bridge can preferably be rotated or pivoted relative to the closed-circuit breathing apparatus or the housing of the closed-circuit breathing apparatus by means of the rotating element in order to provide access to the breathing bag arranged below the spring bridge in the working position.

[0017] Alternatively or in addition to the rotational movement, the spring bridge can be moved from the working position to an open position by means of the at least one sliding element, thus providing access to the breathing bag located beneath the spring bridge. The ability of the spring bridge to rotate or move relative to a closed-circuit breathing apparatus or the housing of a closed-circuit breathing apparatus allows a technician to easily and quickly access the breathing bag of the closed-circuit breathing apparatus for cleaning or disassembly purposes.

[0018] Because the at least one fastening element is arranged as a rotating element and / or sliding element on the spring bridge, the spring bridge can be pivoted or displaced relative to the closed-circuit breathing apparatus in a very simple and quick manner, thus allowing access to the breathing bag. The at least one fastening element of the spring bridge is preferably arranged on a counter-fastening element of the closed-circuit breathing apparatus, in particular in a rotationally movable manner. The counter-fastening element is preferably mounted on an inner wall of a housing, in particular a lower shell or lower part of the closed-circuit breathing apparatus, in a rotationally and / or displaceably movable manner.

[0019] The spring bridge is preferably designed as a U-shaped profile, with the spring bridge support forming the base of the U-shaped profile, and a fastening element in the form of a rotating element and / or sliding element arranged at the free ends of each of the two legs of the U-shaped profile. This ensures particularly easy pivoting or displaceability of the spring bridge relative to the housing of a closed-circuit breathing apparatus.

[0020] A spring bridge designed in this way creates more space for maintenance procedures within the closed-circuit breathing apparatus due to the spring bridge's ability to move from a working position to an open position, particularly on a spring bridge-breathing bag plate system of the closed-circuit breathing apparatus or a breathing bag of the closed-circuit breathing apparatus. The breathing bag below the spring bridge-breathing bag plate system is easily accessible when the spring bridge and thus the spring bridge-breathing bag plate system are in the open position and can be easily removed for cleaning or replacement purposes in this open position. Fitting the cleaned or new breathing bag into the closed-circuit breathing apparatus is correspondingly simple when the spring bridge and thus the spring bridge-breathing bag plate system are in the open position.

[0021] According to a preferred further development of the invention, a spring bridge can be provided with the fastening element or the rotating element being a rotating joint, a universal joint, an angle element, a ball joint, a hinge element, or a plug-in receptacle for fastening to a pin of the closed-circuit breathing apparatus. Rotating elements designed in this way enable particularly simple rotating or pivoting of the spring bridge relative to the housing of the closed-circuit breathing apparatus and thus easy and quick access to the breathing bag of the closed-circuit breathing apparatus, which is arranged below the spring bridge in the working position. The spring bridge can be designed in such a way that it has only a single fastening element, in particular a single rotating element, by means of which the spring bridge can be moved back and forth between the working position and the open position.For example, a profile can be arranged at an angle on the spring bridge support of the spring bridge, at the end of which a fastening element is arranged. This fastening element can be arranged so that it can rotate and pivot on a corresponding counter-fastening element on the housing of the closed-circuit breathing apparatus, for example, on a pin. However, a spring bridge particularly preferably has two fastening elements, by means of which the spring bridge is pivotably mounted on corresponding counter-fastening elements of the housing of a closed-circuit breathing apparatus, in particular the lower housing section of a closed-circuit breathing apparatus.

[0022] Preferably, in the case of a spring bridge, it can further be provided that the at least one fastening element is arranged on at least one cantilever arm of the spring bridge, wherein the at least one cantilever arm is arranged on the spring bridge support at an angle to the spring bridge support. A spring bridge in which two cantilever arms are arranged on two opposite sides of the spring bridge support at an angle to the spring bridge support is particularly advantageous. In particular, the two cantilever arms together with the spring bridge support form a U-shaped or approximately U-shaped profile. Fastening elements, preferably rotating elements, are preferably arranged at the free ends of the cantilever arms, by means of which fastening elements the spring bridge can be mounted in a rotatable or pivotable manner on corresponding counter-fastening elements of the housing of the closed-circuit breathing apparatus.A spring bridge designed in this way can, for example, be easily rotated or pivoted from the working position to the open position by a 90° or approximately 90° rotation, so that in the open position, the spring bridge or the spring bridge support of the spring bridge runs perpendicular or approximately perpendicular to the underside of the closed-circuit breathing apparatus. This allows a breathing bag that was covered by the spring bridge in the working position to be freely accessible.

[0023] Preferably, plug-in receptacles are provided as rotating elements at the ends of the cantilever arms facing away from the spring bridge support, which are rotationally connected to corresponding counter-fastening elements designed as pins on the housing wall of the closed-circuit breathing apparatus. In contrast to the known spring bridge-breathing bag plate system, a spring bridge designed in this way allows the spring bridge to be folded and even removed from the closed-circuit breathing apparatus. This offers the user the advantage of gaining space for all other activities necessary to maintain the closed-circuit breathing apparatus. The spring bridge is no longer permanently attached to the lower shell of the device, in particular riveted, as in the known spring bridge-breathing bag plate system, but is held movable and / or removable on the lower shell of the device.In particular, the design of the rotating elements as plug-in receptacles allows the spring bridge to be rotated around pins that form the counter-fastening elements for the plug-in receptacles, as well as easily removed from them by overcoming a clamping force. This allows for particularly easy access to the breathing bag of the closed-circuit breathing apparatus, allowing the user to remove it from the closed-circuit breathing apparatus and clean it accordingly.

[0024] According to a preferred development of the invention, a spring bridge can be provided with the sliding element being a guide slot or a guide pin for guiding the spring bridge on a counter-sliding element, in particular a counter-guide pin or a counter-guide slot, of the closed-circuit breathing apparatus. This enables displacement, in particular a linear displacement, of the spring bridge relative to the closed-circuit breathing apparatus. By displacing the spring bridge from the working position into an open position or an intermediate open position, additional space can be created for the assembly or disassembly of a breathing bag of a closed-circuit breathing apparatus. The at least one sliding element can also be designed, for example, as a telescopic guide, by means of which the spring bridge can be displaced linearly between the working position and the open position or an intermediate open position.Preferably, a sliding element is provided on each of the two cantilever arms of a U-shaped spring bridge.

[0025] According to a particularly preferred further development of the invention, a spring bridge can be provided with at least one holding element for holding the spring bridge in a working position and for holding the spring bridge in an open position. The spring bridge can be held in the respective position relative to the housing of the closed-circuit breathing apparatus by the holding element(s). This means that in the working position, the holding element holds the spring bridge firmly relative to the housing of the closed-circuit breathing apparatus, so that the spring bridge forms the counter-bearing for the spring elements of a spring bridge-breathing bag plate system. The at least one holding element is preferably designed as a latching element or clamping element. This means that the holding element or elements are preferablyThe retaining elements are designed in such a way that, in the working position, the device is ready for use by locking or clamping, and that, in the open position, the spring bridge can be easily removed for maintenance. In both positions, the spring bridge can be held immobile relative to the closed-circuit breathing apparatus thanks to the retaining element(s).

[0026] Particularly preferred is a spring bridge in which the spring bridge support has a locking device for locking a breathing bag plate of the spring bridge-breathing bag plate system, which is spring-loaded by the at least one spring element of the spring bridge-breathing bag plate system, to the spring bridge support. This means that the locking device serves to fix the breathing bag plate of a spring bridge-breathing bag plate system to the spring bridge support of the spring bridge. Such a locking device serves to optimize the installation and removal of the spring bridge or the spring bridge-breathing bag plate system from the closed-circuit breathing apparatus. For disassembly of the spring bridge orof the spring bridge breathing bag plate system, the breathing bag plate of the spring bridge breathing bag plate system, which is arranged directly but detachably on the breathing bag, is pulled towards the spring bridge support and locked, in particular latched or clamped, with the locking device of the spring bridge. To lock the breathing bag plate to the spring bridge support, the at least one spring element of the spring bridge breathing bag plate system, in particular the two compression springs, is compressed to a minimum, resulting in a very compact unit comprising the spring bridge, the breathing bag plate, and the at least one spring element. This compact unit, which fundamentally represents the spring bridge breathing bag plate system, can be rotated or shifted in a simple movement sequence thanks to the at least one rotating element and / or sliding element and, if necessary, removed from the closed-circuit breathing apparatus.This provides easy access to the breathing bag of the closed-circuit breathing apparatus and all other components within the closed-circuit breathing apparatus. When the spring bridge is in the open position, the breathing bag can be easily removed from the spring bridge-breathing bag plate system, in particular from the breathing bag plate of the spring bridge-breathing bag plate system, and then taken for cleaning. The spring bridge, and thus the spring bridge-breathing bag plate system, is reassembled onto the closed-circuit breathing apparatus in the reverse order. The spring bridge or compact unit of the spring bridge-breathing bag plate system is pivotally and / or slidably attached to the counter-fastening element of the housing wall of the closed-circuit breathing apparatus by means of at least one fastening element. It can be folded or moved from the open position into the working position and locked there by means of the retaining element.After the spring bridge has reached the working position and is locked or clamped in this position, the locking device can be released so that the breathing bag plate of the spring bridge-breathing bag plate system finds its position on the breathing bag due to the spring force of the at least one spring element and can exert a corresponding spring force on the breathing bag.

[0027] In a preferred further development of the invention, it can be provided in the case of a spring bridge that the locking device is pivotally articulated on the spring bridge support via a pivot axis, in particular such that in a release position in which the breathing bag plate of the spring bridge-breathing bag plate system is not held on the spring bridge support by means of the locking device, the locking device runs flat or approximately flat to the spring bridge support, and in a locking position in which the breathing bag plate of the spring bridge-breathing bag plate system is held on the spring bridge support by means of the locking device, the locking device runs inclined, in particular perpendicular, to the spring bridge support.With a spring bridge designed in this way, the position of the locking device relative to the spring bridge support allows the user to determine whether the breathing bag plate of the spring bridge-breathing bag plate system is fixed to the spring bridge or not. This means that the locking device, which is preferably designed as a locking lever, is designed in terms of size and folding direction in such a way that when the locking device is in the upright position, i.e. when the breathing bag plate is locked and held in place, it is not possible to close the housing cover, i.e. the upper housing section of a closed-circuit breathing apparatus. This forces the user to check the breathing circuit of the closed-circuit breathing apparatus, which ultimately increases the safety of the entire closed-circuit breathing apparatus. It is not possible to use the closed-circuit breathing apparatus with the breathing bag plate locked to the spring bridge support.

[0028] The locking device is preferably designed as a latching element or clamping element. A bayonet lock is also possible. In the release position of the locking device, the locking device preferably runs parallel or flush with the spring bridge support of the spring bridge. In this release position, the locking device does not engage behind the breathing bag plate, so that the latter remains freely movable relative to the spring bridge. In the locking position, the locking device engages behind the breathing bag plate and thereby holds it firmly to the spring bridge support of the spring bridge. The locking device is pivotally mounted on the spring bridge support about a pivot axis, so that it can be easily moved from the release position to a locking position and vice versa. The locking device is preferably arranged centrally on or in the spring bridge support of the spring bridge.This allows the breathing bag plate to be held centered on the spring bridge support.

[0029] For cleaning purposes, a user of the closed-circuit breathing apparatus can manually move the breathing bag plate toward the spring bridge support of the spring bridge against the spring force of the at least one spring element of the spring bridge-breathing bag plate system. Then, by pivoting the locking device from the release position to the locking position, lock the breathing bag plate to the spring bridge support. The locking device is designed such that it firmly holds the breathing bag plate to the spring bridge in the locking position, preventing it from easily springing back to its original position due to compression of the at least one spring element.The resulting, highly compact unit comprising the spring bridge, breathing bag plate, and at least one spring element can be pivoted and / or displaced particularly easily relative to the housing of a closed-circuit breathing apparatus, thus ensuring easy access to the breathing bag of the closed-circuit breathing apparatus. The particularly vertical arrangement of the locking device or locking lever to the spring bridge support in the locked position ensures that the upper side of the closed-circuit breathing apparatus housing cannot be mounted to the lower side of the closed-circuit breathing apparatus. Only when the locking device has been moved from the locked position to the released position, thus releasing the movement of the breathing bag plate, can the upper part of the closed-circuit breathing apparatus housing be mounted to the lower part of the closed-circuit breathing apparatus housing.This ensures that the functional reliability of the spring bridge / bag plate system and thus of the closed-circuit breathing apparatus is monitored. The special arrangement and functionality of this type of spring bridge locking device forces the user to monitor the breathing circuit, which ultimately increases the safety of the entire closed-circuit breathing apparatus. Using the closed-circuit breathing apparatus with the bag plate locked is not possible.

[0030] A spring bridge breathing bag system has at least one spring element, which is arranged between the breathing bag plate and the spring bridge or the spring bridge support of the spring bridge. The at least one spring element can be designed in various ways. A spring bridge breathing bag system particularly preferably has two compression springs or two tension springs. In order to securely hold such compression or tension springs on the spring bridge, a spring bridge is preferred in which the spring bridge support has at least one first receiving element for arranging at least a first end of the at least one spring element of the spring bridge breathing bag system. This means that on the side of the spring bridge support facing the breathing bag there is a so-called receiving geometry for one end of the compression springs or tension springs of the spring bridge breathing bag system. The receiving geometry orThe first receiving element can be an annular groove or a cylindrical projection, for example a sleeve-shaped or cup-shaped projection. The at least one receiving element serves as a counter-bearing for the at least one spring element and thus holds the at least one spring element in a defined position relative to the spring bridge support of the spring bridge. The at least one spring element can additionally be held on the first receiving element of the spring bridge support by means of fixing elements. It is particularly advantageous if the at least one first receiving element is designed to hold the at least one spring element of the spring bridge breathing bag system in a form-fitting manner. For example, plug-in elements such as pins or split pins can serve as fixing elements.

[0031] According to a second aspect of the invention, this object is achieved by a spring bridge breathing bag plate system for a closed-circuit breathing apparatus, comprising a breathing bag plate, a spring bridge, and at least one spring element arranged between the breathing bag plate and the spring bridge. The spring bridge breathing bag plate system is characterized in that the spring bridge is designed according to the previously described first aspect of the invention, in particular according to claims 1 to 8. A spring bridge breathing bag plate system designed in this way for a closed-circuit breathing apparatus enables particularly simple movement of the spring bridge breathing bag plate system between a working position and an opening position, and thus easy assembly and disassembly of a breathing bag from the spring bridge breathing bag plate system or from the closed-circuit breathing apparatus.This is ensured by the fact that the spring bridge and, accordingly, the spring bridge-breathing bag plate system can be pivoted and / or slidably mounted on the housing of a closed-circuit breathing apparatus. The advantages described in detail with regard to the spring bridge according to the first aspect of the invention naturally also apply to the spring bridge-breathing bag plate system according to the second aspect of the invention.

[0032] The fact that the spring bridge can be pivoted or moved relative to the housing of the closed-circuit breathing apparatus and, if necessary, removed from the housing thanks to the at least one fastening element of the spring bridge ensures particularly easy removal of the breathing bag of the closed-circuit breathing apparatus from the housing of the closed-circuit breathing apparatus. The breathing bag plate is detachably attached to the breathing bag so that after pivoting the unit, consisting of the spring bridge, at least one spring element and breathing bag plate, the breathing bag is freely accessible to a user for removal from the closed-circuit breathing apparatus. The at least one spring element of the spring bridge-breathing bag plate system can be designed in different ways. For example, the at least one spring element can be designed as a compressible elastomer or rubber. Particularly preferably, the at least one spring element is designed as a compression spring or tension spring.The spring bridge-breathing bag plate system preferably comprises two compression springs or tension springs running parallel to one another. The respective first ends of the compression springs or tension springs are held positively and, if necessary, additionally non-positively on the spring bridge support. The respective second ends of the spring elements are arranged positively and, if necessary, additionally non-positively on the breathing bag plate. The spring elements are preferably designed in such a way that they enable compression in the direction of the longitudinal axis of the spring elements, but prevent pivoting of the spring elements relative to the longitudinal axis of the spring elements as far as possible. This ensures a certain dimensional stability of the spring elements. Another design of the compression springs or tension springs, which are optimized with regard to buckling and straight compression and decompression paths, is also conceivable.For example, the spring elements can be designed as compression springs or tension springs with a rectangular spring wire cross-section.

[0033] Springs of this design particularly support linear compression and decompression paths. The breathing bag plate is detachably attached to the top of the breathing bag. This can be achieved using magnets, snap fasteners, tabs, or form-fitting geometries, for example.

[0034] According to a preferred further development of the invention, in a spring bridge breathing bag plate system, one or more stabilizing elements can be arranged between the breathing bag plate and the spring bridge support of the spring bridge, for the defined up and down movement of the breathing bag plate and thus of the breathing bag in the direction from and to the spring bridge. This means that the at least one stabilizing element prevents buckling of the at least one spring element, in particular of the two compression springs, during compression, i.e. when the breathing bag volume increases. To prevent buckling of the at least one spring element, the breathing bag plate is preferably connected linearly and rotationally to the spring bridge by two wire brackets designed as stabilizing elements. The stabilizing elements enable a defined up and down movement of the breathing bag plate and thus of the breathing bag in all orientations of the closed-circuit breathing apparatus.The at least one stabilizing element is preferably designed such that it only allows a linear movement or only an approximately linear movement of the breathing bag plate in the direction of the spring bridge support or away from the direction of the spring bridge support. This can ensure that the breathing bag attached to the breathing bag plate is compressed or decompressed in a defined manner. The at least one stabilizing element can also be designed differently besides wire brackets. For example, one or more scissor joints or a guide arm with a pivot point located geometrically outside the spring bridge can be provided. Corresponding receptacles for the at least one stabilizing element can be provided both on the spring bridge, i.e. in particular on the spring bridge support, and on the breathing bag plate.These receptacles hold the at least one stabilizing element securely between the spring bridge support and the breathing bag plate, so that the functionality of the at least one stabilizing element is guaranteed.

[0035] Preferably, in a spring bridge breathing bag plate system, the breathing bag plate can have at least one second receiving element for arranging at least one second end of the at least one spring element of the spring bridge breathing bag plate system. This ensures that the at least one spring element, preferably spring elements designed as compression springs or tension springs, is securely arranged on the breathing bag plate. The at least one second receiving element can, for example, be an annular groove, a tubular or sleeve-shaped projection, or a projection in the form of a cup or pin on the breathing bag plate.In addition to the positive holding of the at least one spring element on the breathing bag plate, fixing elements, for example in the form of small pins, can be provided in order to ensure a better hold, in particular a force-fitting hold, of the at least one spring element on the breathing bag plate or the at least one second receiving element of the breathing bag plate.

[0036] According to a third aspect of the invention, this object is achieved by a closed-loop breathing apparatus comprising a housing with a lower housing part and an upper housing part, a breathing bag, a CO2 absorber, an oxygen cylinder, and a spring bridge / breathing bag plate system. According to the invention, the spring bridge / breathing bag plate system of the closed-loop breathing apparatus is designed according to the second aspect of the invention, in particular according to one of claims 9 to 12. Such a closed-loop breathing apparatus has the same advantages as have been detailed in accordance with the spring bridge of the first aspect of the invention or the spring bridge / breathing bag plate system of the second aspect of the invention.

[0037] A closed-circuit breathing apparatus designed in this way can be particularly easily maintained and cleaned after use. The breathing bag of the closed-circuit breathing apparatus is particularly easy to access due to the pivoting and / or rotating mobility of the spring bridge of the spring bridge-breathing bag plate system. After use of the closed-circuit breathing apparatus, for example in the event of a fire, the spring bridge or the unit comprising the spring bridge, spring element(s) and breathing bag plate, i.e. the spring bridge-breathing bag plate system, can be easily moved from a working position to an open position and, if necessary, completely removed from the housing of the closed-circuit breathing apparatus, so that a user can quickly and easily remove the breathing bag from the closed-circuit breathing apparatus in order to clean it.

[0038] Preferably, in a closed-circuit breathing apparatus, it can be provided that the housing, in particular the lower housing part, has at least one counter-fastening element for rotatably and / or slidingly holding the spring bridge and thus the spring bridge-breathing bag plate system on the closed-circuit breathing apparatus by means of the at least one fastening element of the spring bridge. The at least one counter-fastening element can, for example, be a pin which protrudes from the inside of the housing wall of the lower housing part of the closed-circuit breathing apparatus housing. Corresponding fastening elements, in particular in the form of plug-in receptacles, of the spring bridge enable both pivoting of the spring bridge relative to the housing of the closed-circuit breathing apparatus and easy removal of the spring bridge from the closed-circuit breathing apparatus. This ensures particularly quick and easy access to the breathing bag.

[0039] According to a particularly preferred further development of the invention, a closed-circuit breathing apparatus can be provided with two opposite sides of the housing, in particular sides of the lower housing section, each having a counter-fastening element for receiving two fastening elements of the spring bridge support. Such a design of the closed-circuit breathing apparatus ensures a particularly good and secure connection of the spring bridge to the housing of the closed-circuit breathing apparatus. In particular, the spring bridge or the spring bridge-breathing bag plate system thus also serves as a stabilizing element within the closed-circuit breathing apparatus, as it connects two opposite walls of the lower housing section of the closed-circuit breathing apparatus and thus acts as a reinforcing support element below the upper housing section.

[0040] According to a further development of the invention, a spring-bridge breathing bag plate system can be provided with one or more projections on the breathing bag. In particular, the breathing bag has a circumferential collar on the top of the breathing bag, to which or in which the breathing bag plate can be positively received. This ensures that the breathing bag plate is arranged in a defined position relative to the breathing bag. Particularly preferably, the breathing bag plate is releasably attached to the top of the breathing bag by magnets, snap fasteners, tabs, or positive geometries. PREFERRED EMBODIMENTS

[0041] Further measures improving the invention will become apparent from the following description of exemplary embodiments of the invention, which are illustrated in the figures. All features and / or advantages arising from the claims, the description, and the drawings, including structural details and spatial arrangements, may be essential to the invention both individually and in various combinations. Elements with the same function and mode of operation are provided with the same reference numerals in the drawings. They schematically show: Fig. 1 shows a spring bridge breathing bag plate system of a known closed-circuit breathing apparatus in a sectional view, Fig. 2 shows a side view of a spring bridge breathing bag plate system according to the invention for a closed-circuit breathing apparatus, Fig. 3 shows the spring bridge breathing bag plate system according to Fig. 2in a view from below, Fig. 4 a perspective view of the spring bridge breathing bag plate system according to Fig. 2 , wherein the locking device of the spring bridge is in a release position, Fig. 5 in a perspective view the spring bridge breathing bag plate system according to Fig. 2 , wherein the locking device is in the locking position, Fig. 6 in a perspective view a spring bridge breathing bag plate system according to the invention, Fig. 7 in a side view a breathing bag with a breathing bag plate of a spring bridge breathing bag plate system arranged on the breathing bag, Fig. 8 the spring bridge breathing bag plate system according to Fig. 6 in a side view, Fig. 9in a further perspective view the spring bridge breathing bag plate system according to the Fig. 6 , Fig. 10in an exploded view the spring bridge breathing bag plate system according to the Fig. 6, Fig. 11 a perspective view of a housing lower part of a closed-circuit breathing apparatus with a spring bridge breathing bag plate system according to the invention in a working position, Fig. 12 a perspective view of the housing lower part according to Fig. 11 , wherein the spring bridge breathing bag plate system is pivoted into an opening position, Fig. 13 a further perspective view of the housing base according to Fig. 12 , in which the spring bridge breathing bag plate system is in an open position, Fig. 14 a further perspective view of the housing lower part of the closed-circuit breathing apparatus, in which the spring bridge breathing bag plate system is in a working position, Fig. 15 a side view of the housing lower part of the closed-circuit breathing apparatus according to Fig. 11 , with a spring bridge breathing bag plate system in the open position, Fig. 16 in a side view the housing bottom part of a closed-circuit breathing apparatus according to Fig. 11 with a spring bridge breathing bag plate system in a working position, and Fig. 17 a closed-circuit breathing apparatus according to the invention without a housing upper part.

[0042] Fig. 2 shows schematically in a side view an inventive spring bridge breathing bag plate system 80 for a closed-circuit breathing apparatus. Fig. 3 shows schematically the Fig. 2 The spring bridge breathing bag plate system 80 shown in a view from below. The spring bridge breathing bag plate system 80 comprises a spring bridge 40 with a spring bridge support 42, two spring elements 82 and a breathing bag plate 18. In the Fig. 2 In the view of the spring bridge breathing bag plate system 80 shown, the breathing bag plate 18 is brought as close as possible to the spring bridge support 42 of the spring bridge 40, whereby the two spring elements 82 are compressed to such an extent that they are in the Fig. 2are not visible. In this locking position P, the breathing bag plate 18 is fixed to the underside of the spring bridge support 42 by means of the locking device 50 (not shown). A breathing bag 10 of a closed-circuit breathing apparatus 100 could easily be removed from the breathing bag plate 18 in the locking position P. The spring bridge 40 has a yoke-like or U-shaped profile. Cantilever arms 46 are arranged on two opposite sides of the spring bridge support 42, which form the legs of the U-shaped profile of the spring bridge 40. The cantilever arms 46 are arranged at an angle to the spring bridge support 42 on the spring bridge support 42. A fastening element 44 in the form of a rotary element is arranged at the free ends of each of the two cantilever arms 46. The rotary element 44 can be, for example, a rotary joint, a universal joint, a ball joint, or a hinge element.Preferably, the rotating element 44 is a plug-in receptacle for rotational fastening to a pin designed as a counter-fastening element 108 on an inner housing wall of a housing 102 of a closed-circuit breathing apparatus 100. Fastening elements 44 designed in this way allow the spring bridge 40 to be easily pivoted from a working position A into an opening position Ö. The spring bridge 40 is preferably pivoted by 90° or approximately 90° around the axis of rotation of the two rotating elements 44. This ensures simple and quick access to the breathing bag 10 of a closed-circuit breathing apparatus 100, which is arranged below the spring bridge 40 in the working position A. The breathing bag 10 can then be very easily removed from the closed-circuit breathing apparatus 100 for cleaning purposes.The breathing bag plate 18 of the spring bridge breathing bag plate system 80 has first receiving elements 54 for receiving spring elements 82, which are designed in particular as compression springs or tension springs. The first receiving elements 54 are preferably designed for the positive-locking retention of the spring elements 82 of the spring bridge breathing bag system 80. For example, plug-in elements, such as pins or split pins, can additionally serve as fixing elements for fixing the spring elements 82 to the first receiving elements 54.

[0043] In the Figs. 4 and 5 The spring bridge breathing bag plate system 80 is designed according to Fig. 2 and 3shown in a perspective view. It is clearly visible in this position that a fastening element 44 in the form of a rotary plug-in receptacle is arranged at the free end of the cantilever arms 46, i.e. at the ends of the cantilever arms 46 which face away from the spring bridge support 42. The spring bridge 40 is no longer firmly riveted to the underside of a housing of a closed-circuit breathing apparatus, as in the prior art, but can be rotatably connected to the housing 102 of a closed-circuit breathing apparatus 100 via two pins protruding from the inner wall of the housing bottom shell 104 and the two plug-in receptacles 44 at the free ends of the cantilever arms 46.

[0044] The spring elements 82 of the spring bridge breathing bag plate system 80, which are designed as compression springs, are in the Figs. 4 and 5shown illustrations, so that the breathing bag plate 18 is arranged directly on the underside of the spring bridge support 42. In the Fig. 4 the locking device 50 of the spring bridge 40 arranged on a pivot axis 52 is in a release position F. In this release position F, the locking device 50 does not hold the breathing bag plate 18, so that the breathing bag plate 18 could be moved away from the spring bridge support 42 due to the spring force of the spring elements 82.

[0045] In the Fig. 5the locking device 50 is in a locking position P. In this locking position P, the locking device 50 locks the breathing bag plate 18 to the spring bridge support 42. This means that the locking device 50, which is preferably designed as a latching element or clamping element, engages behind, for example, a corresponding undercut of the breathing bag plate 18 and thus holds it in a defined position below the spring bridge support 42. In this locking position P, the spring bridge-breathing bag plate system 80 forms a very compact unit which can be easily moved, in particular pivoted, from the working position A into an opening position Ö.The compact unit of the spring bridge breathing bag plate system 80 and the pivoting of the spring bridge breathing bag plate system 80 about the pivot axis of the rotating element 44 create a large amount of space for access to the then accessible breathing bag 10 of a closed-circuit breathing apparatus 100.

[0046] Fig. 6 shows schematically the spring bridge breathing bag plate system 80 according to those in Fig. 2 to 5in a perspective view. The locking device 50, which is arranged to be pivotable about the pivot axis 52, is located in the release position F, so that the breathing bag plate 18 is arranged at a distance from the spring bridge support 42 of the spring bridge 40 due to the spring force of the spring elements 82 designed as compression springs. The spring bridge-breathing bag plate system 80 additionally has a stabilizing element 56, which ensures that the breathing bag plate 18 is displaced in a straight line, i.e. parallel to the spring bridge support 42 of the spring bridge 40, both during the movement of the breathing bag plate 18 in the direction of the spring bridge support 42 and during the movement of the breathing bag plate 18 away from the spring bridge support 42. The stabilizing element 56 ensures that the spring elements 82 designed as compression springs do not bend, but can compress or decompress in a straight line along their spring axis.

[0047] Fig. 7shows a schematic side view of a breathing bag 10 with a breathing bag plate 18 of a spring bridge breathing bag plate system 80 arranged on the breathing bag 10. The breathing bag plate 18 has two second receiving elements 20 for the positive reception of the respective second ends of the compression or tension springs 82 of the spring bridge breathing bag plate system 80. The second receiving elements 20 are preferably designed as annular grooves, tubular, pot-shaped, or sleeve-shaped projections 22. In addition to the positive holding of the compression or tension springs 82 on the breathing bag plate 18, fixing elements (not shown), for example in the form of small pins, can be provided in order to ensure a better hold, in particular a force-fitting hold, of the compression or tension springs 82 on the breathing bag plate 18 or the at least one second receiving element 20 of the breathing bag plate 18.The breathing bag 10 preferably has a stable bottom 14 and a top 12 that is movable relative to the stable bottom 14. Furthermore, connections and sleeves 16 can be arranged on the bottom 14.

[0048] In Fig. 8 The spring bridge breathing bag plate system 80 is in accordance with Fig. 6 in a side view, in Fig. 9 The spring bridge breathing bag plate system 80 is designed according to Fig. 6 shown in a further perspective view. The stabilizing element 56 is clearly visible, which ensures that the breathing bag plate 18 is displaced in a straight line, ie parallel to the spring bridge support 42 of the spring bridge 40, when filling or emptying the breathing bag 10 of a closed-circuit breathing apparatus 100. In Fig. 9The fastening elements 44 are clearly visible at the ends of the cantilever arms 46. The fastening elements 44, here rotating elements, serve for the simple and defined pivoting of the spring bridge 40 and thus of the spring bridge-breathing bag plate system 80 relative to the housing 102 of a closed-circuit breathing apparatus 100. The rotating elements 44 shown here are so-called plug-in receptacles that can be plugged out onto these counter-fastening elements 108 for rotation about corresponding counter-fastening elements 108 on the inner wall of a housing base 104 of a housing 102 of a closed-circuit breathing apparatus 100. Accordingly, the plug-in receptacles can also be removed from the counter-fastening elements 108, so that the spring bridge-breathing bag plate system 80 can be completely removed from the closed-circuit breathing apparatus 100.

[0049] Fig. 10 shows schematically in an exploded view the spring bridge breathing bag plate system 80 according to the Fig. 6The locking device 50 is designed as a pivot lever and can be pivotally mounted on the pivot axis 52 of the spring bridge support 42. The spring elements 82 are arranged, preferably fixed, between the spring bridge support 42 and the breathing bag plate 18. So that the spring elements 82 can be decompressed and, in particular, compressed in a straight line, the stabilizing elements 56, here in the form of wire brackets, are stretched between the spring bridge support 42 and the breathing bag plate 18. The stabilizing elements 56 ensure that the spring elements 82, designed as compression springs, do not bend, but can compress or decompress in a straight line along their spring axis. Accordingly, uniform pressure can be exerted on the breathing bag 10 of a closed-circuit breathing apparatus 100 via the breathing bag plate 18.

[0050] In the Figs. 11 to 16various views of a housing lower part 104 of a housing 102 of a closed-circuit breathing apparatus 100 are shown, each with a spring bridge breathing bag plate system 80 according to the invention. Fig. 11 , 14 and 16 the spring bridge breathing bag plate system 80 is in a working position A, in the Fig. 12 , 13 and 15the spring bridge-breathing bag plate system 80 is in an opening position Ö. In the working position A, the spring bridge 40 or the spring bridge-breathing bag plate system 80 is arranged on the lower housing part 104 of the closed-circuit breathing apparatus 100 in such a way that the spring elements 82 arranged between the spring bridge 40 and the breathing bag 10 can exert pressure on the breathing bag 10. This means that in the working position A, the spring bridge 40 serves as a support for the compression springs or tension springs. In the working position A, the spring bridge 40 and thus the spring bridge-breathing bag plate system 80 are arranged immovably, preferably locked, on the closed-circuit breathing apparatus 100. In the opening position Ö, the spring bridge 40 and thus the spring bridge breathing bag plate system 80 are pivoted by 90° or approximately 90° compared to the working position A.This releases the breathing bag 10 of a closed-circuit breathing apparatus 100 and allows it to be easily removed for cleaning.

[0051] The spring bridge 40 and the spring bridge breathing bag plate system 80 serve to stabilize the housing base 104 of the housing 102 of the closed-circuit breathing apparatus 100. This is Fig. 17 . This diagram schematically illustrates a closed-circuit breathing apparatus 100 according to the invention. The closed-circuit breathing apparatus 100 comprises a housing 102 with a lower housing part 104 and an upper housing part 106, a CO2 absorber 120, a breathing bag 10, an oxygen cylinder 130, and a spring bridge breathing bag plate system 80 according to the invention. Via fastening elements 44 at the free ends of the cantilever arms 46, the spring bridge breathing bag plate system 80 is rotatably and / or slidably attached to corresponding counter-fastening elements 108 on two opposite inner walls of the lower housing part 104. LIST OF REFERENCE SYMBOLS

[0052] 10Breathing bag 12Top of the breathing bag 14Bottom of the breathing bag 16Connections, sleeves 18Pressure plate / breathing bag plate 20Second receiving element 22Protrusion 40Spring bridge 42Spring bridge support 44Fastening element 46Cantilever arm 48Holding element 50Locking device 52Pivot axis 54First receiving element 56Stabilizing element 58Snap element 80Spring bridge breathing bag plate system 82Spring element 84First end of the spring element 86Second end of the spring element 100Circular breathing apparatus 102Housing 104Lower housing 106Upper housing 108Counter-fastening element 110Sides of the housing 120CO 2 absorber 130Oxygen cylinder 140Breathing gas cooler unit AWorking position ÖOpening position FRelease position PAlocking position State of the art:

[0053] 210 Breathing bag 212 Top of the breathing bag 214 Bottom of the breathing bag 216 Connections, sleeves 218 Pressure plate / breathing bag plate 240 Spring bridge 282 Compression springs 1000 Closed-circuit breathing apparatus 1020 Housing 1040 Lower housing section 1060 Upper housing section

Claims

1. Spring bridge (40) for a spring bridge breathing bag plate system (80) of a closed-circuit breathing apparatus (100), comprising a spring bridge carrier (42) for arranging at least one spring element (82) of a spring bridge breathing bag plate system (80) and comprising at least one fastening element (44) for holding the spring bridge (40) on the closed-circuit breathing apparatus (100), wherein the at least one fastening element (44) is a rotary element and / or sliding element for rotatably and / or slidably moving the spring bridge (40) on and relative to the closed-circuit breathing apparatus (100), wherein the spring bridge (40) is rotatable and / or slidable by means of the rotary element and / or the sliding element from a working position (A) into an opening position (Ö) to release access to a breathing bag (10) of the closed-circuit breathing apparatus (100), wherein the spring bridge (40) remains fastened to the closed-circuit breathing apparatus when the spring bridge is in the opening position (Ö).

2. Spring bridge (40) according to claim 1, characterized in that the rotary element is a rotary joint, a universal joint, an angle element, a ball joint, a hinge element or a plug-in receptacle for fastening to a pin of the closed-circuit breathing apparatus (100).

3. Spring bridge (40) according to either claim 1 or claim 2, characterized in that the at least one fastening element (44) is arranged on at least one cantilever arm (46) of the spring bridge (40), the at least one cantilever arm (46) being arranged on the spring bridge carrier (42) at an angle to the spring bridge carrier (42).

4. Spring bridge (40) according to any of the preceding claims, characterized in that the sliding element is a guide slot or a guide pin for guiding the spring bridge (40) on a counter-sliding element, in particular a counter-guide pin or a counter-guide slot, of the closed-circuit breathing apparatus (100).

5. Spring bridge (40) according to any of the preceding claims, characterized in that the spring bridge (40) has a holding element (48) for holding the spring bridge (40) in the working position (A) and for holding the spring bridge (40) in the opening position (Ö).

6. Spring bridge (40) according to any of the preceding claims, characterized in that the spring bridge carrier (42) has a locking device (50) for locking a breathing bag plate (18) of the spring bridge breathing bag plate system (80), which breathing bag plate is spring-loaded by the at least one spring element (82) of the spring bridge breathing bag plate system (80), to the spring bridge carrier (42).

7. Spring bridge (1) according to claim 6, characterized in that the locking device (50) is pivotally hinged to the spring bridge carrier (42) via a pivot axis (52), in particular such that, in a release position (F), in which the breathing bag plate (18) of the spring bridge breathing bag plate system (80) is not held on the spring bridge carrier (42) by means of the locking device (50), the locking device (50) runs flat or approximately flat to the spring bridge carrier (42), and, in a locking position (P), in which the breathing bag plate (18) of the spring bridge breathing bag plate system (80) is held on the spring bridge carrier (42) by means of the locking device (50), the locking device (50) runs inclined to the spring bridge carrier (42).

8. Spring bridge (1) according to any of the preceding claims, characterized in that the spring bridge carrier (42) has at least one first receiving element (54) for arranging at least one first end (84) of the at least one spring element (82) of the spring bridge breathing bag plate system (80).

9. Spring bridge breathing bag plate system (80) for a closed-circuit breathing apparatus (100), comprising a breathing bag plate (18), a spring bridge (40) and at least one spring element (82) which is arranged between the breathing bag plate (18) and the spring bridge (40), characterized in that the spring bridge (40) is designed according to any of the preceding claims.

10. Spring bridge breathing bag plate system (80) according to claim 9, characterized in that one or more stabilizing elements (56) are arranged between the breathing bag plate (18) and the spring bridge carrier (42) of the spring bridge (40), for the defined up and down movement of the breathing bag plate (18) in the direction from and towards the spring bridge.

11. Spring bridge breathing bag plate system (80) according to claim 9 or 10, characterized in that the breathing bag plate (18) has at least one second receiving element (20) for arranging at least one second end (86) of the at least one spring element (82) of the spring bridge breathing bag plate system (80).

12. Spring bridge breathing bag plate system (80) according to any of the preceding claims 9 to 11, characterized in that the breathing bag plate (18) has fastening means for releasably fastening the breathing bag plate (18) to the breathing bag top side (12) of a breathing bag (10).

13. Closed-circuit breathing apparatus (100), comprising a housing (102) that has a lower housing part (104) and an upper housing part (106), a CO2 absorber (120), a breathing bag (10), an oxygen bottle (130) and a spring bridge breathing bag plate system (80), characterized in that the spring bridge breathing bag plate system (80) is designed according to any of the preceding claims 9 to 12.

14. Closed-circuit breathing apparatus (100) according to claim 13, characterized in that the housing, in particular the lower housing part (104), has at least one counter-fastening element (108) for rotatably and / or slidably holding the spring bridge (40) on the closed-circuit breathing apparatus (100) by means of the at least one fastening element (44) of the spring bridge carrier (42).

15. Closed-circuit breathing apparatus (100) according to either claim 13 or claim 14, characterized in that on each of two opposite sides (110) of the housing (102), in particular of the lower housing part (104), a counter-fastening element (108) is provided for receiving two fastening elements (44) of the spring bridge carrier (42).

16. Closed-circuit breathing apparatus (100) according to any of the preceding claims 13 to 15, characterized in that the breathing bag (10) comprises one or more projections (22) for form-fittingly receiving the breathing bag plate (18).