FIREFIGHTING VEHICLES

Description

[0001] The invention relates to a fire-fighting vehicle with at least one extinguishing lance, wherein the vehicle is intended for arrangement under a vehicle, wherein the vehicle and the vehicle are arranged on a common support plane, and the extinguishing lance has a penetration unit which is extendable between a start position and an end position for penetrating a floor of the vehicle, wherein the penetration unit is arranged at least partially beyond a penetration plane in the end position, as seen from the support plane.

[0002] Extinguishing lances are known, for example, from EP 3 045 210 A1, US 4,625,808, and US 5,839,664. Each lance features a spike that can be pushed through the wall to distribute extinguishing agent beyond the wall. For this purpose, such lances have one or more channels for extinguishing agents, which are distributed into the environment beyond the wall via openings in the spike or the penetration unit.

[0003] US 2006 / 219416 A1 discloses a pneumatic penetration unit for aircraft extinguishing systems, comprising a piston slidably mounted in a cylinder, which separates a piston chamber and a foaming chamber, and a blade connected to the piston for piercing a wall. After a piezo valve opens, compressed air is introduced into the piston chamber, pneumatically pushing the piston into its end position for penetrating the wall. In this end position, a poppet valve located in the piston in a flow path between the piston chamber and the foaming chamber is opened mechanically via a tappet, allowing compressed air to flow into the foaming chamber. At the same time, liquid extinguishing agent flows into the foaming chamber in the piston's end position, foaming the extinguishing agent. The piston is also pushed back pneumatically by injecting compressed air into the piston chamber below the piston.The piston is therefore only operated pneumatically.

[0004] WO 2020 / 206482 A1 describes a fire extinguishing device with an attachment unit for attaching the extinguishing device to a wall, such as a battery housing wall, and with a penetration unit for penetrating the wall. The penetration unit is movable relative to the attachment unit and can be brought into an end position for penetrating the wall, in which the penetration unit is arranged at least partially beyond a penetration plane, as seen from the attachment unit. Compressed air is used as the propellant. The extinguishing device thus has an extinguishing agent supply line and a propellant supply line.

[0005] For battery-powered vehicles, for example, a template is known from DE 10 2018 222 429 A1 that specifies positions for safe penetration of an extinguishing lance through the vehicle wall. The optimal position for penetration of the extinguishing lance when used on vehicles with underbody batteries is usually difficult to access. Therefore, such templates can only be used quickly and safely on vehicles positioned on their sides or on their roofs.

[0006] WO 2021 / 146763 A1 discloses a penetration unit for introducing an extinguishing agent into a battery. The penetration unit is arranged on a transport carriage, which has an actuating element to enable it, together with the penetration unit, to be moved underneath a vehicle. The penetration unit can be extended between a starting position and an end position for penetrating the floor of a vehicle, with the actuation of the penetration unit being effected by the extinguishing agent. The same fluid is therefore used to actuate the penetration unit and for extinguishing. A disadvantage is that the positioning of the penetration tool and the extinguishing process cannot be controlled independently of one another. In particular, difficulties can arise in applying the pressure to the extinguishing agent necessary to penetrate the floor.

[0007] The object of the present invention is to establish a device and a method by which safe and precise fire fighting can be carried out in vehicles with underbody batteries.

[0008] This object is achieved according to the invention in that the penetration unit of at least one extinguishing lance is hydraulically movable by a hydraulic fluid as a propellant, independently of an extinguishing agent, as defined in claim 1.

[0009] A "trolley" is a movable structure, such as one with wheels or rollers for movement. A fire extinguishing lance is a device used in firefighting operations, which can be used, for example, as a water-carrying fitting. Alternatively, the use of other extinguishing agents, such as liquid nitrogen or inert gases, is conceivable.

[0010] The term "vehicle" here includes vehicles involved in accidents, as well as vehicles on test benches, parked vehicles, etc., which have an underbody battery or at least a battery accessible above the ground by a penetration unit of an extinguishing lance.

[0011] The penetration level is the level that the penetration unit or a defined part of the penetration unit must exceed in order to penetrate the floor of the vehicle.

[0012] A fire is extinguished by removing the necessary heat, removing the combustible material, interrupting the air supply or by interfering with the chemical reaction by reducing its reactivity.

[0013] When battery-powered vehicles catch fire, thermal runaway usually occurs between individual cells. To stop this process, which normally escalates with ever-increasing temperatures and leads to the burning of additional cells, heat dissipation and further cooling are necessary.

[0014] Both water and an emulsion of water and an additive with various effects are conceivable as extinguishing agents. To further increase extinguishing performance, liquid nitrogen-based extinguishing agents are also conceivable.

[0015] The extinguishing lance is primarily suitable for fluid extinguishing agents. Ember powder, for example, could clog the extinguishing lance or block the cavity in the battery, preventing further application of extinguishing agent.

[0016] The extinguishing agent is introduced through holes in the blade of the extinguishing lance. Alternatively, the extinguishing lance can be hollow and have one or more larger openings for introducing the extinguishing agent.

[0017] Such a vehicle can be used by emergency services or for test bench applications or in underground garages. The vehicle can be permanently connected to the extinguishing agent supply in the underground garage and the test bench area. This vehicle can also be carried as equipment in firefighting vehicles.

[0018] To ensure easier penetration of the vehicle's floor and reliable cutting of the material, it is advantageous if at least one fire lance has a penetration unit with a blade. A blade is a section of the fire lance with a pointed cutting edge, which serves to cut through the floor material.

[0019] To ensure sufficient extinguishing agent is delivered to the fire or to the components to be cooled, the blade is designed to have a diameter of at least 70 mm, although manufacturing tolerances may result in variations in diameter, which are included. This allows a sufficiently large passage for the extinguishing agent to be cut into the floor.

[0020] The penetration unit of at least one extinguishing lance is hydraulically movable using a hydraulic fluid as the propellant. This allows for a simple and powerful drive method for the penetration unit of the extinguishing lance, independent of the extinguishing agent. In particular, the positioning of the extinguishing lance and the actual extinguishing process can be controlled independently of each other by the propellant. This allows the extinguishing agent connection and the propellant connection to be flowed independently of each other. In particular, it is possible to flow the propellant connection at a different pressure level than the extinguishing agent connection. This ensures safe penetration of the vehicle floor.

[0021] To ensure exceptional flexibility in transport and deployment, the vehicle features its own extinguishing agent connection. To allow the propellant to be used independently of the extinguishing agent, the vehicle features an independent propellant connection in addition to the extinguishing agent connection. This makes it possible to first position the vehicle and then connect it to an extinguishing agent supply, for example, from a fire engine, tanker, hydrant, or similar.

[0022] A simple, uncomplicated, and quick-connect connection is achieved when the extinguishing agent connection is designed as a Storz coupling, as is known from CH 3134 A. This allows for easy supply of the vehicle via the pressure hoses typically carried in fire engines or those used in buildings for fire protection. This allows for a connection to a fire engine, a pump, a wall hydrant, or similar equipment.

[0023] For better handling and heavy weight, it's best if the vehicle has its own drive. This could be an internal combustion engine or an electric motor, for example, ideally positioned away from at least one fire extinguishing lance, so that it won't be damaged if placed underneath the burning vehicle.

[0024] It is advantageous if the vehicle is equipped with self-cooling nozzles. These nozzles are connected to the extinguishing agent connection and emit extinguishing agent mist – preferably water mist – through fine openings. This cools the vehicle during the extinguishing process, thus preventing it from igniting or damaging the vehicle.

[0025] To ensure a vehicle that is easy to maneuver by hand, it is advantageous to have a drawbar. Alternatively, this drawbar can be connected to a fire engine or any other vehicle, and the vehicle can be maneuvered using its movement.

[0026] It is advantageous if the drawbar is electrically insulated so that in the event of electrical charge being transferred through penetration into the burning battery or the battery to be cooled, there is no danger to the emergency services.

[0027] In order to increase the distance between the emergency services and / or their vehicles and the underbody battery(ies), it is advantageous if the drawbar has a length greater than 1.5 m.

[0028] It is particularly advantageous if the blade is essentially tubular and connected to an extinguishing agent supply. This allows for material savings and the diameter of the passage to be increased as much as possible.

[0029] In order to be able to control the vehicle and the fire lance more precisely, a special design provides a height measuring system for measuring the clear height under the vehicle and / or for measuring the penetration depth of the penetration unit of at least one fire lance.

[0030] The "clearance" here refers to the free space beneath the vehicle between the vehicle's wheels. This means that the clearance is the distance from the vehicle's floor to the common contact plane of the car and the vehicle.

[0031] It is particularly advantageous if the vehicle determines a minimum extension length of the penetration unit of at least one fire lance after measuring the clear height under the vehicle and then extends the penetration unit of at least one fire lance accordingly.

[0032] The movement of the penetration unit can be monitored, for example, using a cable pull sensor.

[0033] For better planning and monitoring of firefighting activities, it is advantageous for the vehicle to monitor the extended length of the firefighting lance and determine the penetration depth of the penetration unit. This makes it possible to obtain an overview of the position of the penetration unit of at least one firefighting lance and thus also to better identify the effectiveness or potential sources of error if no extinguishing is achieved after an extended period of time. The penetration depth here refers to the distance the penetration unit has traveled at the penetration level after penetrating the ground.

[0034] It's advantageous if the car is remote-controlled. This can be achieved via a radio connection or similar.

[0035] Greater targeting accuracy during extinguishing or cooling can be achieved if the vehicle is equipped with a temperature detection system. Ideally, this can take the form of a thermal imaging camera that captures thermal images of the vehicle's floor and transmits them to the controlling emergency responder. Using this information, they can determine the ideal point for the fire lance's penetration unit and steer the vehicle accordingly. Alternatively, the vehicle can determine this point itself using a control system and penetrate the area with the penetration unit at the maximum temperature.

[0036] An associated procedure provides for the car to be positioned accordingly if the car detects areas with temperature peaks on the vehicle using a temperature detection system.

[0037] In order to be able to apply extinguishing agents at several points at the same time, it is advantageous if at least four extinguishing lances are provided at a distance from each other on the vehicle - preferably at the corners of the vehicle.

[0038] In alternative designs, a different number of extinguishing lances is possible.

[0039] In order to prevent the extinguishing lance from slipping during the extinguishing process, primarily due to the recoil of the extinguishing agent, a special design provides that in the end position of the penetration unit, when extinguishing agent flows in, a force acts on the penetration unit due to pressure from the extinguishing agent, which essentially holds the penetration unit in the end position.

[0040] Alternatively, it can also be provided that the penetration unit can be locked in the start position and end position by special locking devices, such as a locking pin in a guide rail.

[0041] It is particularly advantageous if the carriage has a support system which is provided for supporting the carriage against the support plane, wherein the support system preferably has a height measuring system which determines a clear height under the vehicle.

[0042] In order to provide a stable platform for the movement of at least one fire lance, it is optionally provided that the trolley has a parking brake with which the trolley can be secured against rolling away.

[0043] Furthermore, it is the object of the invention to provide a method for firefighting and / or cooling an underbody battery of a battery-electric vehicle which is safe and contributes to minimizing the risks to persons and objects.

[0044] This object is achieved in that a vehicle is provided with at least one extinguishing lance and is connected to an extinguishing agent supply at an extinguishing agent connection and to a propellant at a propellant connection, the vehicle is moved under the vehicle, a penetration unit of at least one extinguishing lance is moved by means of the propellant from a start position to an end position, wherein it penetrates a floor of the vehicle and extinguishing agent is introduced into the vehicle.

[0045] To prevent any unintentional movement during extinguishing, a favorable method provides for at least one extinguishing lance to be secured against unintentional movement with a mounting unit on the floor of the vehicle. The connection between the mounting unit and the floor can be established in a variety of ways, for example, via adhesives, flanges, clamps, magnetic mounts, or bayonet locks.

[0046] In the event of a fire, the trolley is positioned near the burning vehicle. If the trolley has its own engine, it is started and moved remotely beneath the burning vehicle or vehicle that needs to be cooled.

[0047] The connection to an extinguishing agent supply can be established before or afterward. For this purpose, an emergency responder establishes the supply line to supply the vehicle.

[0048] After positioning the trolley underneath the vehicle, the extinguishing lance(s) are sprayed with propellant. For this purpose, a propellant container can be provided on the trolley, which is connected to an external propellant container via a hose via the propellant connection.

[0049] The propellant moves the penetration unit in the main direction of movement and penetrates the floor of the vehicle.

[0050] The main direction of movement within the meaning of the invention is to be understood as the direction of movement of the penetration unit between a starting position and an end position, which is directed normal to the support plane of the carriage.

[0051] This puts the penetration unit in its final position and either extinguishing agent is introduced or extinguishing agent flows automatically through the penetration unit into the vehicle.

[0052] The invention will be explained in more detail below with reference to the non-limiting figures. They show: Fig. 1 shows a general view of a carriage according to the invention; Fig. 2 shows the carriage in a side view; Fig. 3 shows the carriage in a plan view; Fig. 4 shows the use of the carriage according to a method according to the invention; Fig. 5 shows a section through an extinguishing lance in a starting position; Fig. 6 shows a section through the extinguishing lance in a final position; and Fig. 7 shows the penetration unit of Fig. 6 in detail.

[0053] In Fig. 1 A carriage 1 according to the invention is illustrated. The carriage 1 has four wheels 2 or rollers, with which it stands on a support plane A, which is usually the road on which the vehicle F to be extinguished is located. In the embodiment shown, four extinguishing lances 4 are provided on the carriage 1. The extinguishing lances 4 are shown in detail in the Fig. 5 bis Fig. 7 and each consist of an indentation unit 30, which is arranged so as to be translationally displaceable between a start position and an end position in a cylinder 200 along a main movement direction 50.

[0054] In the starting position, the penetration unit 30 is arranged completely within the carriage 1. In the end position, the penetration unit 30 is arranged in the floor 40 of a vehicle F and displaced maximally in the main direction of movement 50.

[0055] In a special design, it is possible for the extinguishing lances 4 to be pivoted and moved in any direction.

[0056] However, in a simple and robust design, such as the one shown in the figures, no pivoting is provided. In the simplest form, a main direction of movement 50 is provided approximately perpendicular to the support plane A. This allows the floor 40 of the vehicle F, beneath which the carriage 1 is arranged, to be penetrated by the extinguishing lances 4.

[0057] In the simplest version, the extinguishing lances 4 are designed as tips that can penetrate the floor 40 of a vehicle F.

[0058] For displacement on the penetration unit 30, the extinguishing lances 4 have a piston 301 on a side facing away from the blade 303, which is slidably guided in a cylinder 200. The piston 301 serves as the contact surface for the propellant. Alternatively, the piston 301 can be designed as a ring piston, and the extinguishing agent can be supplied to the fire source via a dedicated line within the ring.

[0059] For easy maneuverability, the trolley 1 has a drawbar 5, which can optionally be electrically insulated. The drawbar 5 can be designed for manual operation or for movement with a towing vehicle.

[0060] An extinguishing agent connection 102 is made of Fig. 3 This can be attached, for example, to the drawbar 5. An extinguishing agent connection 102 and a propellant connection 402 are provided. From the extinguishing agent connection 102, an extinguishing agent supply line 101 leads to the supply opening 204 for the extinguishing lance 4. From the propellant connection 402, a propellant supply line 401 leads to the propellant opening 400 of the extinguishing lance 4. The connections 102, 402 can be connected to an extinguishing agent source and a propellant source via separate lines (not shown). This allows the positioning of the extinguishing lance 4 by the propellant and the actual extinguishing process by the extinguishing agent to be controlled independently of one another.

[0061] The drawbar 5 here has a length L, which can be, for example, 1.5 m or more, in order to create the greatest possible distance from the fire.

[0062] In a very simple design, an extinguishing agent pipe can also be provided, over which the vehicle 1 can be moved. The extinguishing agent connection is provided directly on this extinguishing agent pipe. The vehicle 1 is then moved using the extinguishing agent pipe and positioned beneath a vehicle, and an extinguishing line 101 is connected to the extinguishing agent connection 102. Furthermore, it is also conceivable that such an extinguishing agent pipe is already integrated into the drawbar 5.

[0063] Fig. 4 shows the use of the vehicle 1. In this case, a battery-electric vehicle F is equipped with underbody batteries B. In order to extinguish a fire in the underbody batteries B, the vehicle 1 is placed underneath the vehicle F. A clear height h beneath the vehicle F is measured using a system - for example an optical height measurement system - on the vehicle 1. Using this now known clear height h, a control system or an emergency worker operating the vehicle 1 can determine a necessary movement of the extinguishing lances 4. Furthermore, it can be provided that the vehicle 1 monitors the movement of the extinguishing lances 4 and the extended length is known at all times. Furthermore, the necessary penetration depth T as seen from a penetration plane 60 is then determined using the clear height h.

[0064] The extinguishing lances 4 are extended in the direction of movement essentially normal to the support plane A by applying the propellant, which is, for example, a hydraulic fluid. Upon contact with the vehicle F, the extinguishing lances 4 penetrate the floor 40 of the vehicle F.

[0065] In a further development of the invention, points can be specially marked on the floor 40 of the vehicle F, which the vehicle 1 recognizes independently or by transmitting to an emergency worker via camera recordings as penetration points intended for fire extinguishing lances 4 and then pierces them with the fire extinguishing lances 4.

[0066] In a further development, a control valve can be provided by which individual extinguishing lances 4 can be controlled with the propellant and are thereby extended and supplied with extinguishing agent.

[0067] The vehicle F is secured to extinguish or cool the underbody batteries B, for example, using stabilization systems that stabilize the vehicle via hooks on a rod and a lashing strap. The lashing strap clamps the system and the vehicle against the ground 40. Alternatively, hydraulic support is possible.

[0068] In a special design, a thermal imaging camera on the vehicle 1 provides thermal images of the underside of the vehicle F. This allows the temperature profile or the point of highest heating to be observed and the position of the vehicle 1 to be changed if necessary.

[0069] Furthermore, for example, in the case of an overheated or burning SUV underbody battery B, the clearance h may be so large that it may be necessary, for example, to raise the vehicle 1 using a support system that is part of the vehicle 1, thus reducing the distance between the ground 40 of the vehicle F and the vehicle 1. This can be determined and controlled using the height measurement system as a sensor.

[0070] The support system can be designed with hydraulic rams to support the carriage 1, similar to the booms of a crane truck.

[0071] Fig. 5 and Fig. 6 show an exemplary extinguishing lance 4, which has a fastening unit 20 and a penetration unit 30. The exemplary extinguishing lance 4 is in Fig. 5 and Fig. 6 each shown rotated 180° relative to the installation position in vehicle 1 for the purpose of illustration. The fastening unit 20 is used for the optional fastening of the extinguishing lance 4 to the floor 40 of the vehicle F and has a flange part 201 which is tightly connected to a cylinder casing 202 of a cylinder 200. The flange part 201 has a connecting surface 203 which is designed to be sealingly connected to the floor 40 of a vehicle F. The cylinder 200 extends normal to the connecting surface 203. The cylinder casing 202 has a supply opening 204 for an extinguishing agent supply line 101. From the interior of the cylinder 200, an access opening 205 leads through a flange part 201 for the penetration unit 30 and the extinguishing agent to the outside. The penetration unit 30 is moved in the cylinder 200 along its main axis and along the main direction of movement 50.

[0072] If the extinguishing lance 4 is tightly connected to the floor 40, a space which is sealed to the outside is formed inside the extinguishing lance 4 and which can be supplied with extinguishing agent via the extinguishing agent supply line 101.

[0073] The extinguishing lance 4 is arranged such that the floor 40 is essentially flush with the surface of the vehicle 1 facing the vehicle F. Due to this arrangement, the penetration plane 60 is parallel to the floor 40 and at the level of the floor 40.

[0074] In Fig. 5 The penetration unit 30 is shown in the starting position. This is the position in which the penetration unit 30 has been moved furthest against the main direction of movement 50. It rests against a closure plate 209 of the fastening unit 20. Preferably, the entire penetration unit 30 is arranged in the cylinder 200. The cylinder 200 is arranged entirely within the carriage 1. In the starting position, the penetration unit 30 is also arranged entirely within the carriage 1 and is flush with the surface of the carriage 1 facing the vehicle F.

[0075] The penetration unit 30 has a piston 301 and a cutting unit 302 with a blade 303 located thereon.

[0076] The piston 301 comprises a distribution chamber 310, which is open radially outward toward the cylinder jacket 202 and is fluidly connected via an opening 304 to a channel 305 inside the cutting unit 302. The opening 304 is designed as a bore. A fixing opening can also be provided for fixing the cutting unit 302. The cutting unit 302 can be fixed axially in this opening against displacement in the main direction of movement 5, for example with a cotter pin or a bolt. Alternatively, the blade 303 can also be screwed directly into the piston 301. The distribution chamber 310 is delimited from the remaining interior of the cylinder 200 in the main direction of movement 50 by parts of the piston 301 adjacent to the cylinder jacket 202.In the main direction of movement 50 upstream of the piston 301, in the starting position, a propellant opening 400 is provided in the closure plate 209, which is connected to a propellant supply line 401.

[0077] If a valve of the propellant supply line 401 is opened, the propellant pushes the piston 301 toward the end position. At the downstream end of the cylinder 200, the cylinder casing 202 has vent openings 215. These allow air or another propellant to escape downstream of the cylinder 200 when the cylinder is driven to its end position. The vent openings 215 are located downstream of the supply opening 204 and, in the end position, are not fluidly connected to the distribution chamber 310. In the end position, the piston 301 closes the vent openings 215.

[0078] In end position (as in Fig. 6 shown), the supply opening 204 is in flow connection with the distribution space 310 and the extinguishing agent can be transported from the extinguishing agent supply line 101 via the interior of the blade 303, the channel 305, beyond the floor 40.

[0079] If propellant is introduced - preferably with overpressure, for example with more than 35 bar - when the penetration unit 30 is in the start position or in a position between the end position and the start position, the piston 301 is moved by the pressure of the propellant along the main movement direction 50 and towards an end position - see Fig. 6 - pressed. The piston 301 moves along the cylinder 200 and forms a chamber 206. The extinguishing agent cannot flow past the piston 301 and accelerates it toward the flange section 201.

[0080] In Fig. 6 The penetration unit 30 is shown in its final position. The piston 301 of the penetration unit 30 is positioned against the flange portion 201 or a stop of the fastening unit 20, thus preventing further movement in the direction of the main movement direction 50.

[0081] The penetration unit 30 has the cutting unit 302, which is designed as a tube here, for penetrating the base 40 downstream of the piston 301. The tube has a cylindrical, axially closed side wall through which the elongated channel 305 is formed inside the side wall. The blade 303, which is suitable for penetrating the base 40, is arranged on the downstream end face 309 of the cutting unit 302. In the region of the piston 301, the cutting unit 302 either has a plurality of openings 304 on its side wall or, as shown here, the cutting unit 302 opens into the bore in the piston 301. In the end position, the extinguishing agent supply 101 is connected via the supply opening 204 to the distribution chamber 310 and further to the openings 304 and to the channel 305. The extinguishing agent is transported via the channel 305 to a location beyond the floor 40 through the penetration level 60.

[0082] As already mentioned, the penetration unit 30 is moved by propellant along the cylinder 200 from the starting position in the main movement direction 50 to the end position and cuts through the base 40 with the cutting unit 302. If the piston 301 is now in the end position, extinguishing agent can flow into the piston 301 via the extinguishing agent supply line 101.

[0083] A connection V for flow communication is arranged between chamber 206 and channel 305. Piston 301 has a check valve 320 in connection V, which is designed here as a check valve. This check valve 320 opens for flow from opening 304 toward chamber 206.

[0084] When the propellant flows in through the supply opening 400, the non-return valve 320 is closed. If extinguishing agent flows into the opening in the end position or in a region around the end position, in which the extinguishing agent line 101 and the opening 304 are fluidly connected via the distribution chamber 310, the non-return valve 320 opens in the connection V.

[0085] The piston 301 here has two seals 308 that tightly seal the distribution chamber 310. The flow of extinguishing agent thus occurs primarily via channel 305 and connection V.

[0086] Due to the flow into chamber 206, a force F acts on piston 301, since the extinguishing agent is essentially incompressible, as is acceptable for water. The propellant in chamber 206 escapes, for example, through leaks or vents.

[0087] The force F can be increased if a check valve is also arranged in the closure plate 209, which blocks the propellant supply line 401 from flowing out of the chamber 206. However, the check valve can also be arranged closer to the propellant container.

[0088] Thus, a force F now acts on the piston 301 and thus on the penetration unit 30, counter to a recoil force R from the escaping extinguishing agent jet. This holds the extinguishing lance 4 within the base 40.

[0089] Fig. 7 shows a penetrating unit 30 in section of the above extinguishing lance 4 in detail. The penetrating unit 30 has a blade 303 and a piston 301 firmly connected to it. An opening 304 for extinguishing agent is provided in the piston 301. This opening 304 extends from the distribution chamber 310 formed by the piston 301 and the cylinder (not shown).

[0090] The piston 301 has, on its side facing away from the blade 303, an attack surface a for a hydraulic force F.

[0091] When extinguishing agent flows from the extinguishing lance 4, the recoil force R and the force F act on the penetration unit 30.

[0092] By applying pressure to the engagement surface a, the penetration unit 30 is first moved along the main movement direction 50 toward the base 40 and further through the base 40. This pressure acts on the piston 301 through a propellant or the extinguishing agent. When the movement is complete, the extinguishing agent flows through the opening 304 and penetrates through the blade 303 into the fire source below the piston 301 in a vertical movement direction. At the same time, the extinguishing agent flows upwards via the check valve 320 into the chamber 206, which is flush with the engagement surface a in the direction of the blade 303. As a result, the force F acts in the direction of the blade 303 and the base 40, representing the fluid pressure of the extinguishing agent acting on the engagement surface a in the chamber 206. It is advantageous if the penetration units 30 of the extinguishing lances 4 are arranged relative to the vehicle 1 in such a way that, in the starting position, they are arranged completely within the vehicle 1 and the cylinder 200.Preferably, the cylinder 200 is located entirely below the surface facing the vehicle F.

[0093] When moving to the end position, the penetration units 30 of the extinguishing lances 4 then move to and through the carriage platform 6 in the direction of the floor 40.

Claims

1. Cart (1) for firefighting having at least one extinguishing lance (4), wherein the cart (1) is intended for arrangement under a vehicle (F), wherein the cart (1) and the vehicle (F) are arranged on a common contact plane (A), and the extinguishing lance (4) has a penetration unit (30) which can be extended between a starting position and an end position in order to penetrate a floor (40) of the vehicle (F), wherein the penetration unit (30) in the end position is arranged at least partially beyond a penetration plane (60) as seen from the contact plane (A), wherein the cart (1) has an extinguishing agent connection (102) and a propellant connection (402) independent thereof, and that the penetration unit (30) of at least one extinguishing lance (4) is movable hydraulically by a hydraulic fluid as propellant, independently of an extinguishing agent.

2. Cart (1) according to claim 1, characterized in that the at least one extinguishing lance (4) has a penetration unit (30) with a blade (303), wherein the blade (303) preferably has a diameter of at least 70 mm.

3. Cart (1) according to claim 1 or 2, characterized in that the cart (1) has a drive.

4. Cart (1) according to one of claims 1 to 3, characterized in that the cart (1) has a drawbar (5) which is preferably electrically insulated and preferably has a length (L) greater than 1.5 m.

5. Cart (1) according to one of claims 1 to 4, characterized in that the blade (303) is essentially tubular in design and is connected to an extinguishing agent supply (101) in a flow-connected manner.

6. Cart (1) according to one of claims 1 to 5, characterized in that the cart (1) comprises a height measurement system for measuring the clearance height (h) under the vehicle (F) and / or for measuring a penetration depth (T) of the penetration unit (30) of the at least one extinguishing lance (4).

7. Cart (1) according to one of claims 1 to 6, characterized in that the cart (1) is designed to be remotely controllable.

8. Cart (1) according to one of claims 1 to 7, characterized in that the cart (1) has a temperature detection system.

9. Cart (1) according to one of claims 1 to 8, characterized in that the cart (1) has a support system which is provided to support the cart (1) against the contact plane (A), wherein the support system is preferably connected to the height measurement system.

10. Cart (1) according to one of claims 1 to 9, characterized in that the cart (1) has a parking brake with which the cart (1) can be secured against rolling away.

11. Method for firefighting and / or cooling underbody batteries (B) of a battery-electric vehicle (F), characterized in that a cart (1) having at least one extinguishing lance (4) is provided and is connected to an extinguishing agent connection with an extinguishing agent supply and to a propellant connection with a propellant, the cart (1) is moved under the vehicle (F), a penetration unit (30) of at least one extinguishing lance (4) is moved from a starting position to an end position by means of the propellant, wherein it penetrates a floor (40) of the vehicle (F) and introduces extinguishing agent into the vehicle (F).

12. Method according to claim 11, characterized in that the cart (1) measures a clearance height (h) under the vehicle (F) using a height measurement system and in that the cart (1) preferably has a minimum extension length of the at least one extinguishing lance (4) after measuring the clearance height (I) under the vehicle (F) and the at least one extinguishing lance (4) is then extended accordingly, wherein, in particular, the cart (1) monitors the extended length of the extinguishing lance (4) and a penetration depth (T) is determined.

13. Method according to claim 11 or 12, characterized in that the at least one extinguishing lance (4) is secured to the floor (40) of the vehicle (F) against unintentional movement by means of a fastening unit (20).

14. Method according to one of claims 11 to 13, characterized in that the cart (1) is moved to at least one area with a temperature peak after the cart (1) detects temperature peaks on the vehicle (F) using a temperature detection system.