Multi-terrain tripod for geological survey

Abstract

The invention discloses a multi-terrain tripod for geological survey, and particularly relates to the technical field of tripods, the multi-terrain tripod comprises a supporting seat, a plurality of supporting assemblies are arranged on the outer side of the supporting seat, each supporting assembly comprises a hinge seat arranged on the supporting seat, a hinge frame is hinged to one side of each hinge seat, and a first hinge rod is hinged to each hinge frame. Through corresponding cooperative use of all the structures, the elastic band is attached to the ground contour, the elastic band is matched with non-Newtonian fluid filled with the elastic band, the elastic band naturally flows due to gravity in a static state to adapt to ground fluctuation, instant hardening is achieved when the elastic band is pressed dynamically to enhance the supporting rigidity, and the problems that a traditional connecting rod structure is low in adjusting efficiency and poor in attaching degree under the field complex terrain are solved; and the pressure of each air bag is accurately adjusted to be in a balanced state through the pressure release valve. Manual repeated fine adjustment is not needed, the regulation and control time is shortened, and the reliability of measured data of the surveying instrument can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of tripods, and more particularly to a multi-terrain tripod for geological surveying. Background Art

[0002] Geological survey refers to the process of investigating, measuring, and analyzing the geological structure, rock properties, soil composition, and hydrological conditions of the surface and underground through professional and technical means. Its core purpose is to obtain geological information and provide a scientific basis for resource development, engineering construction, and geological disaster prevention and control. A tripod is a key tool for supporting measuring instruments in geological surveys. Its core function is to ensure the stability and measurement accuracy of the instruments. Instruments used in geological surveys (such as total stations and levels) have extremely high requirements for horizontality and verticality. Even the slightest shake will cause measurement data deviation (such as distance and angle errors). The tripod can accurately calibrate the instrument level by adjusting the tripod length and the bubble in the base to ensure data reliability.

[0003] Among them, patent publication number CN220911020U discloses a balancing tripod for geological surveys, comprising a tray, a first connecting rod, a second connecting rod, foot spikes, a fastening mechanism, and an adjustment mechanism; the three first connecting rods are ball-hinged with the bottom of the tray; the second connecting rod is movably engaged with each first connecting rod; the foot spikes are movably mounted on the second connecting rod; the fastening mechanism is mounted on the second connecting rod for fastening the second connecting rod to the ground; and the adjustment mechanism is mounted on the second connecting rod for adjusting the position of the foot spikes within the connecting rod. When this structure is in use, the adjustment mechanism can store or extend the foot spikes in the second connecting rod to avoid accidental injury to people by the sharp parts of the foot spikes when carrying. The fastening mechanism can further stabilize the entire tripod. However, when working in the field, the terrain is undulating and the ground is uneven. The horizontal adjustment effect of a single connecting rod is not good, and it is not easy to adaptively adjust according to the terrain level environment, which is not convenient when used. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a multi-terrain tripod for geological surveying, aiming to solve the problems raised in the above-mentioned background technology.

[0005] The present invention provides the following technical solution: a multi-terrain tripod for geological survey, comprising a support base, wherein a plurality of support assemblies are arranged on the outer side of the support base; The support assembly includes a hinged seat provided on a support seat, a hinged frame hingedly connected to one side of the hinged seat, a first hinged rod hingedly connected to the hinged frame, a second hinged rod hingedly connected to one end of the first hinged rod, a connecting block hingedly connected to one end of the second hinged rod, an adjustment block provided on one side of the connecting block, an end of the connecting block extending to one end of the hinged frame and hinged to the hinged frame, an elastic band provided at the bottom of the adjustment block, and the elastic band filled with a non-Newtonian fluid; The adjustment block includes a guide frame and a top plate, the connecting block is fixed to the top plate, and an airbag is arranged between the top plate and the guide frame. A pressure sensor is arranged on the top plate, and a pressure relief valve is arranged on one side of the pressure sensor. The pressure sensor and the pressure relief valve both pass through the top plate and extend into the airbag.

[0006] An air guide ring is provided at the top of the inner cavity of the support seat, and a catheter is provided at the bottom of the air guide ring. One end of the catheter passes through the top plate and extends to the airbag, and an electromagnetic valve is provided at the connection between the air guide ring and the catheter.

[0007] Optionally, in a possible embodiment, a micro air pump for guiding flow is provided on the outside of the air guide ring, a processor is provided on the top of the air guide ring, the processor and the micro air pump are both embedded in the top of the inner cavity of the support seat, the middle part of the support seat is rotatably connected to a worm, the hinge seat is rotatably connected to a first worm gear, the first worm gear is engaged with the worm, and a second motor for driving the worm to rotate is provided at the bottom of the processor, a second worm gear is fixedly provided on the end of the first hinged rod facing the first worm gear, the second worm gear is engaged with the first worm gear, and the second worm gear is engaged with the first worm gear. The middle part of the second worm gear is rotatably connected to a cross bar, which is fixed to one end of the hinged frame, and a first motor for driving the cross bar to rotate is provided on the outer side of the hinged seat. The solenoid valve, pressure sensor, pressure relief valve and micro air pump are all connected to the processor through wires, and the output end of the micro air pump is connected to the air guide ring. As shown in the accompanying drawings, the output end of the micro air pump is connected to the air guide ring to facilitate the start of the micro air pump to deliver airflow into the air guide ring. The processor adjusts the solenoid valves on each conduit so that after the solenoid valve is opened, the airflow in the air guide ring is delivered to the airbag through the conduit; Optionally, in a possible embodiment, a wire drum is provided on the top of the support seat, a screw rod is connected to the inner thread of the wire drum, a support plate is provided on the top of the screw rod, the top plate is embedded in the guide frame and is slidably connected to the guide frame, the vertical cross-section of the adjustment block is set to a triangle, the second worm gear is embedded in the end of the first hinge rod, and the connections between the second worm gear, the cross rod and the first hinge rod, the hinge frame and the hinge seat are all in the same axial direction; Technical effects and advantages of the present invention: 1. This invention utilizes the support assembly's hinged base, hinged frame, first hinged rod, and second hinged rod to form a three-dimensionally adjustable linkage mechanism. The adjustment block can be deflected at multiple angles at the hinged node, driving the elastic band to conform to the ground contour. Combined with the non-Newtonian fluid filled within the elastic band, the band naturally flows under gravity to adapt to the undulations of the ground in static conditions. Under dynamic pressure, it instantly hardens and enhances support rigidity. This solves the problems of low adjustment efficiency and poor conformity of traditional linkage structures in complex field terrain.

[0008] 2. The pressure sensor in this invention monitors the air pressure within the airbags in real time. Based on this data, the processor drives a micro-pump to inflate the airbags through the air guide ring and catheter. Simultaneously, a pressure relief valve precisely adjusts the pressure in each airbag to a balanced state. This mechanism automatically compensates for height differences between different support points, eliminating the need for manual fine-tuning. Compared to the existing manual adjustment method that relies on a bubble level, this not only shortens adjustment time but also ensures the reliability of the survey instrument's measurement data. 3. The transmission system of the worm, first worm gear, and second worm gear of the present invention can be driven by a second motor to synchronously adjust the deployment angle of the support assembly. The first motor drives the crossbar to rotate and adjust the posture of the articulated frame, thereby achieving multi-angle adjustment of the support assembly. This not only meets the large-angle support requirements in steep terrain, but also prevents accidental shaking and anti-overturning through the self-locking characteristics of the worm gear. It is suitable for harsh working conditions such as slopes and gravel. In summary, through the coordinated use of various structures, the elastic band conforms to the contours of the ground. Combined with the non-Newtonian fluid filled within the elastic band, it naturally flows due to gravity to adapt to the undulations of the ground when static, and instantly hardens and enhances support stiffness when under dynamic pressure. This solves the problems of low adjustment efficiency and poor fit of traditional connecting rod structures in complex field terrain. The pressure relief valve precisely adjusts the pressure of each airbag to a balanced state. This mechanism automatically compensates for height differences between different support points, eliminating the need for repeated manual fine-tuning. Compared to the existing manual adjustment method that relies on a bubble level, this not only shortens adjustment time but also ensures the reliability of the survey instrument's measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below are schematic diagrams and are not intended to limit the actual dimensions of the products, actual processes of the methods, actual timing of signals, and the like involved in the embodiments of the present disclosure.

[0010] Figure 1 It is the main view of the overall structure of the present invention.

[0011] Figure 2 It is a side view of the overall structure of the present invention.

[0012] Figure 3 Schematic diagram of the support assembly of the present invention.

[0013] Figure 4 This is a schematic diagram of the support base, hinged base, micro air pump, processor and air guide ring of the present invention.

[0014] Figure 5 Schematic diagram of the worm, first worm wheel, first hinge rod, hinge frame, second hinge rod and adjustment block of the present invention.

[0015] Figure 6 Schematic diagram of the hinge frame, elastic belt, adjustment block, pressure sensor and pressure relief valve of the present invention.

[0016] Figure 7 Schematic diagram of the worm, first worm gear, second worm gear, first hinged rod and second hinged rod of the present invention.

[0017] Figure 8 This is a schematic diagram of the adjustment block, guide frame, top plate and airbag of the present invention.

[0018] The accompanying drawings are marked as follows: 1. Support seat; 2. Articulated seat; 3. Articulated frame; 4. First articulated rod; 5. Second articulated rod; 6. Adjustment block; 7. Elastic band; 8. Pressure sensor; 9. Pressure relief valve; 10. Air guide ring; 11. Micro air pump; 12. Processor; 13. Conduit; 14. Worm; 15. First worm gear; 16. Second worm gear; 17. Cross bar; 18. First motor; 19. Second motor; 20. Wire drum; 21. Screw; 22. Support plate; 23. Guide frame; 24. Top plate; 25. Airbag. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] As attached Figure 1 -Attached Figure 8 The illustrated multi-terrain tripod for geological surveying uses a support assembly mounted on a support base 1. Air flows through a conduit 13 into an airbag 25, pushing a top plate 24 upward along a guide frame 23 until the height of the support point is balanced with that of the other points, stabilizing the air pressure at a certain level. If the air pressure in a particular airbag 25 is too high, a pressure relief valve 9 opens to vent air, ensuring that the airbags 25 of each support assembly maintain a consistent pressure, thereby achieving horizontal calibration of the tripod. The specific structural configuration of the assembly is as follows: The support assembly includes an articulated seat 2 provided on a support seat 1, a hinged frame 3 is hingedly connected to one side of the articulated seat 2, a first articulated rod 4 is hingedly connected to the articulated frame 3, one end of the first articulated rod 4 is hingedly connected to a second articulated rod 5, one end of the second articulated rod 5 is hingedly connected to a connecting block, an adjustment block 6 is provided on one side of the connecting block, and the end of the connecting block extends to one end of the articulated frame 3 and is hinged to the articulated frame 3, an elastic band 7 is provided at the bottom of the adjustment block 6, and the elastic band 7 is filled with a non-Newtonian fluid; As attached Figure 3 、 5 As shown in Figures 6 and 7, the first hinge rod 4 deflects along the axis point at which the first hinge rod 4 is connected to the hinge frame 3, thereby changing the angle of the second hinge rod 5 on the hinge frame 3. When the second hinge rod 5 deflects, it drives the adjustment block 6 to rotate along the axis point at which the connection block is connected to the hinge frame 3 through the connecting block, thereby achieving the function of adjusting the level of the adjustment block 6, so that the elastic band 7 is in contact with the ground, and when the elastic band 7 is subjected to force, it squeezes the non-Newtonian fluid inside it. Under the action of static gravity, the non-Newtonian fluid is subjected to an extremely low shear rate, and its performance is closer to that of an ordinary liquid. It will naturally flow downward due to gravity, causing the bottom of the airbag to contact the ground and deform under pressure, thereby allowing the airbag to adapt to the shape of the ground and ensure support stability. The regulating block 6 includes a guide frame 23 and a top plate 24. The connecting block is fixed to the top plate 24. An airbag 25 is provided between the top plate 24 and the guide frame 23. A pressure sensor 8 is provided on the top plate 24. A pressure relief valve 9 is provided on one side of the pressure sensor 8. The pressure sensor 8 and the pressure relief valve 9 both pass through the top plate 24 and extend into the airbag 25. As attached Figure 5 、 6 As shown in FIG8 , the pressure sensor 8 is used to detect the air pressure in the airbag 25 so as to inject air into the airbag 25 . At the same time, the pressure relief valve 9 is set to discharge the excess air pressure in the airbag 25 , thereby ensuring that the pressure in the airbag 25 belonging to each support component is the same, thereby ensuring the stability of the horizontal support.

[0021] An air guide ring 10 is provided at the top of the inner cavity of the support base 1, and a conduit 13 is provided at the bottom of the air guide ring 10. One end of the conduit 13 passes through the top plate 24 and extends to the air bag 25. A solenoid valve is provided at the connection between the air guide ring 10 and the conduit 13. As attached Figure 4 、 5As shown in , 6 and 8 , the airflow is gathered by the air guide ring 10 and then diverted through the conduit 13 . The conduit 13 injects the high-pressure airflow into the airbag 25 , causing the airbag 25 to expand. When the airbag 25 expands, the top plate 24 extends from the guide frame 23 along the guidance of the guide frame 23 . At the same time, by adjusting the pressure in each airbag 25 , the height of each top plate 24 can be adjusted. When the top plate 24 moves, the connecting block moves as well, making it easy to adjust it horizontally. Moreover, the top plate 24 is guided by the guide frame 23 , which can effectively ensure the stability of the top plate 24 during displacement, and also ensure the subsequent support stability of the tripod. A micro air pump 11 for guiding flow is provided on the outside of the air guide ring 10, and a processor 12 is provided on the top of the air guide ring 10. The processor 12 and the micro air pump 11 are both embedded in the top of the inner cavity of the support base 1; As attached Figure 4 As shown, the pressure sensor 8 detects the air pressure in the airbag 25 and analyzes it through the processor 12, so that the processor 12 can control the operation of the micro air pump 11 to draw air into the air guide ring 10, and then inject it into the airbag 25 after being diverted by the solenoid valve and the conduit 13, so as to facilitate the adjustment of the air pressure in each airbag 25; A worm 14 is rotatably connected to the middle of the support base 1, and a first worm gear 15 is rotatably connected to the hinge base 2. The first worm gear 15 is engaged with the worm 14, and a second motor 19 for driving the worm 14 to rotate is provided at the bottom of the processor 12; As attached Figure 3 As shown, the worm 14 is driven to rotate by the second motor 19, so that the first worm wheel 15 is driven to rotate when the worm 14 rotates; A second worm gear 16 is fixedly provided at one end of the first hinged rod 4 facing the first worm gear 15. The second worm gear 16 meshes with the first worm gear 15. A crossbar 17 is rotatably connected to the middle portion of the second worm gear 16. The crossbar 17 is fixed to one end of the hinged frame 3, and a first motor 18 for driving the crossbar 17 to rotate is provided on the outer side of the hinged base 2. As attached Figure 5 and 6 As shown, the first worm gear 15 and the second worm gear 16 are engaged with each other, so that when the first worm gear 15 rotates, the second worm gear 16 is driven to rotate, thereby enabling the first hinged rod 4 to deflect and adjust the angle. The cross bar 17 is fixed to the end of the hinged frame 3, so that the second motor 19 drives the cross bar 17 to rotate the hinged frame 3, thereby changing the angle of the hinged frame 3. By changing the angle of the hinged frame 3, the deflection of the first hinged rod 4 can be adjusted to drive the second hinged rod 5 and the adjustment block 6 to deflect, so that the hinged frame 3 and the adjustment block 6 can be leveled to ensure support performance. A wire drum 20 is provided on the top of the support base 1, a screw rod 21 is connected to the inner thread of the wire drum 20, and a support plate 22 is provided on the top of the screw rod 21; As attached Figure 1 and 2 As shown, the surveying equipment can be placed on the support plate 22, and by rotating the screw rod 21 and the support plate 22, the screw rod 21 is extended from the wire drum 20, thereby achieving the function of adjusting the height of the support plate 22; The top plate 24 is embedded in the guide frame 23 and is slidably connected to the guide frame 23. The vertical cross-section of the adjustment block 6 is set to a triangle; As attached Figure 8 As shown, the top plate 24 is slidably connected to the guide frame 23 to facilitate the upward displacement of the top plate 24 when the airbag 25 is inflated. When the top plate 24 moves upward, it drives the connecting block, the hinge frame 3, the first hinge rod 4, the second hinge rod 5 and the hinge seat 2 to move upward, thereby achieving the function of adjusting the level of the support seat 1; The second worm gear 16 is embedded in the end of the first hinge rod 4, and the second worm gear 16, the cross rod 17 and the connection between the first hinge rod 4, the hinge frame 3 and the hinge seat 2 are all in the same axial direction; As attached Figure 3 、 5 As shown in FIG6 , the first hinge rod 4 rotates along the axial direction of the cross rod 17 through the second worm gear 16, and the hinge frame 3 rotates along the axial direction of the connection between the cross rod 17 and the hinge seat 2 through the cross rod 17, so as to adjust the angle of the hinge frame 3 and the first hinge rod 4; The solenoid valve, pressure sensor 8, pressure relief valve 9 and micro air pump 11 are all connected to the processor 12 through wires, and the output end of the micro air pump 11 is connected to the air guide ring 10; As attached Figure 4 As shown, the output end of the micro air pump 11 is connected to the air guide ring 10 to facilitate the startup of the micro air pump 11 to deliver the airflow into the air guide ring 10. The processor 12 adjusts the solenoid valves on each conduit 13 so that after the solenoid valve is opened, the airflow in the air guide ring 10 is delivered to the airbag 25 through the conduit 13.

[0022] The detailed operating principle is as follows: When the tripod is placed on the ground, the first motor 18 rotates the crossbar 17, driving the hinged frame 3 to rotate around the hinged base 2, causing the support assembly to radially expand. At this point, the second motor 19 activates the worm gear 14, which, through the meshing first and second worm gears 15 and 16, deflects the first hinged rod 4. This in turn pushes the second hinged rod 5, which in turn extends the adjustment block 6 downward. When the elastic band 7 of the adjustment block 6 contacts the ground, the non-Newtonian fluid inside fills the gaps in the ground due to gravity, forming a flexible support surface.

[0023] The pressure sensor 8 monitors the air pressure in the airbag 25 in real time. When the height of a certain support point is low, the pressure on the airbag 25 decreases. When the air pressure value is lower than the preset threshold of the processor 12, the processor 12 triggers the micro air pump 11 to inject air into the air guide ring 10, and the solenoid valve of the corresponding conduit 13 opens. The airflow fills the airbag 25 through the conduit 13, pushing the top plate 24 up along the guide frame 23 until the height of the support point is balanced with other points, so that the air pressure is stabilized at a certain pressure. If the air pressure in a certain airbag 25 is too high, the pressure relief valve 9 opens to exhaust, ensuring that the pressure of the airbag 25 of each support component is consistent, thereby achieving horizontal calibration of the tripod.

[0024] When adapting to a slope, the processor 12 controls the second motor 19 to adjust the rotation of the worm 14, causing the first worm gear 15 to rotate the second worm gear 16, thereby changing the angle between the first hinged rod 4 and the hinged frame 3. For example, on a 15° slope, the first hinged rod 4 of the left support assembly can deflect 20° and the right 10°, compensating for the terrain inclination through the angle difference. The self-locking properties of the worm gears and worm 14 prevent the support assembly from retracting due to external forces, ensuring support stability. After the surveying instrument is placed on the support plate 22, its height can be adjusted by rotating the screw 21 inside the screw drum 20. When the instrument's orientation needs to be fine-tuned, the processor controls the pressure differential of the airbags in each support component. For example, the airbag 25 on the left side is inflated by 10 kPa, while the airbag on the right side is inflated by 10 kPa. This causes the support base 1 to tilt slightly. Combined with the mechanical angle adjustment, the instrument's horizontal posture can be adjusted by ±15° without relocating the tripod, improving the convenience of installation and adjustment.

[0025] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-terrain tripod for geological survey, comprising a support base (1), characterized in that: Several support components are provided on the outer side of the support seat (1); The support assembly comprises an articulated seat (2) arranged on a support seat (1), a hinged frame (3) is hingedly connected to one side of the articulated seat (2), a first articulated rod (4) is hingedly connected to the articulated frame (3), one end of the first articulated rod (4) is articulated to a second articulated rod (5), one end of the second articulated rod (5) is articulated to a connecting block, an adjustment block (6) is arranged on one side of the connecting block, and an end of the connecting block extends to one end of the articulated frame (3) and is articulated to the articulated frame (3), an elastic band (7) is arranged at the bottom of the adjusting block (6), and the elastic band (7) is filled with a non-Newtonian fluid; The regulating block (6) includes a guide frame (23) and a top plate (24), the connecting block is fixed on the top plate (24), and an air bag (25) is provided between the top plate (24) and the guide frame (23), a pressure sensor (8) is provided on the top plate (24), a pressure relief valve (9) is provided on one side of the pressure sensor (8), and the pressure sensor (8) and the pressure relief valve (9) both penetrate the top plate (24) and extend into the air bag (25); An air guide ring (10) is provided at the top of the inner cavity of the support seat (1), a conduit (13) is provided at the bottom of the air guide ring (10), one end of the conduit (13) passes through the top plate (24) and extends to the air bag (25), and a solenoid valve is provided at the connection between the air guide ring (10) and the conduit (13).

2. The multi-terrain tripod for geological survey according to claim 1, characterized in that: A micro air pump (11) for guiding flow is provided on the outside of the air guide ring (10), a processor (12) is provided on the top of the air guide ring (10), and both the processor (12) and the micro air pump (11) are embedded in the top of the inner cavity of the support base (1).

3. The multi-terrain tripod for geological survey according to claim 2, characterized in that: A worm (14) is rotatably connected to the middle of the support seat (1), a first worm wheel (15) is rotatably connected to the hinge seat (2), the first worm wheel (15) is meshed with the worm (14), and a second motor (19) for driving the worm (14) to rotate is provided at the bottom of the processor (12).

4. The multi-terrain tripod for geological survey according to claim 3, characterized in that: A second worm gear (16) is fixedly provided at one end of the first hinged rod (4) facing the first worm gear (15), the second worm gear (16) is meshed with the first worm gear (15), a middle portion of the second worm gear (16) is rotatably connected to a cross bar (17), the cross bar (17) is fixed to one end of the hinged frame (3), and a first motor (18) for driving the cross bar (17) to rotate is provided on the outer side of the hinged seat (2).

5. The multi-terrain tripod for geological survey according to claim 1, characterized in that: A wire drum (20) is provided on the top of the support seat (1), a screw rod (21) is connected to the internal thread of the wire drum (20), and a supporting plate (22) is provided on the top of the screw rod (21).

6. The multi-terrain tripod for geological survey according to claim 1, characterized in that: The top plate (24) is embedded in the guide frame (23) and is slidably connected to the guide frame (23), and the vertical cross-section shape of the adjustment block (6) is set to be triangular.

7. The multi-terrain tripod for geological survey according to claim 4, characterized in that: The second worm gear (16) is embedded in the end of the first hinge rod (4), and the connection points of the second worm gear (16), the cross rod (17), the first hinge rod (4), the hinge frame (3), and the hinge seat (2) are all in the same axial direction.

8. The multi-terrain tripod for geological survey according to claim 2, characterized in that: The solenoid valve, pressure sensor (8), pressure relief valve (9) and micro air pump (11) are all connected to the processor (12) via wires. The output end of the micro air pump (11) is connected to the air guide ring (10). The output end of the micro air pump (11) is connected to the air guide ring (10) to facilitate the micro air pump (11) to start and deliver the air flow into the air guide ring (10). The processor (12) adjusts the solenoid valves on each conduit (13), so that after the solenoid valve is opened, the air flow in the air guide ring (10) is delivered to the air bag (25) through the conduit (13).

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