An electric foam sprayer

Abstract

The present invention discloses an electric foam sprayer, comprising a foam sprayer main body, wherein the main body comprises a moving assembly for the movement of the main body and a storage assembly for placing a pipeline of the main body, the moving assembly comprises a first roller, a second roller and a first rod, the first roller and the second roller are connected to two ends of the first rod through a first axis, and a force storage assembly is provided in the first rod; during the release of the pipeline, the second axis and the vortex spring in the force storage assembly can be deformed to realize force storage, so that when the pipeline is exhausted and the pipeline needs to be pulled hard to drive the main body to move synchronously, under the action of the storage assembly, the first roller and the vortex spring are connected, and the torsion released by the vortex spring is cooperated, so that the used pulling force is greatly reduced, the pulling force at the pipeline interface is greatly reduced, the risk of damage to the pipeline interface is reduced, the user's pulling force is reduced, the user experience is improved, and the sprayer main body is more suitable for outdoor work.

Description

Technical Field

[0001] The invention relates to the technical field of foam sprayers, in particular to an electric foam sprayer. Background Art

[0002] Electric foam sprayers are a common cleaning device used in the car wash industry. They use air pressure from an air compressor to compress car wash liquid into foam and spray it out, preventing fine sand particles from damaging the car's paint and prolonging the car's finish. Existing foam sprayers typically use cylinders to store water. Water and car wash liquid are added to the cylinder, and air is forced into the cylinder via an air compressor to create a foam mixture that is sprayed out. The foam sprayer itself is quite heavy, especially when there is a sufficient amount of water in the cylinder. Therefore, the foam sprayer is equipped with a movable component to facilitate its movement. Existing electric foam sprayers include lithium-ion batteries and plug-in electric drives to achieve the desired spraying effect.

[0003] When using a foam sprayer outdoors, the distance the user moves is generally determined by the length of the pipe connected to the sprayer. When the moving distance is exceeded, normal operation generally requires closing and putting down the pipe and spray gun, walking to the sprayer body, and moving the sprayer position in the direction to be moved a certain distance. The user then goes back to pick up the spray gun to spray foam. However, when the distance between the handheld position and the object to be sprayed is not large, the user often chooses to pull the pipe hard to drive the sprayer body to move a certain distance to it. At this time, the sprayer body is heavy, and not only does it require a lot of force to pull it, but the pipe interface is easily damaged when the pulling force is large. Summary of the Invention

[0004] The present invention aims to solve the deficiencies in the prior art and provides an electric foam sprayer.

[0005] To solve the above technical problems, the present invention is solved through the following technical solutions: an electric foam sprayer includes a foam sprayer body, the body includes a moving component for the movement of the body and a storage component for placing the pipe of the body, the moving component includes a first roller, a second roller and a first rod, the first roller and the second roller are connected to the two ends of the first rod through a first axis; a power storage component is provided in the first rod, the power storage component includes a second shaft, a volute spring, a sliding plate, a third shaft and a first pulley, the first shaft is provided on one side of the second shaft, and the third shaft is provided on the other side of the second shaft, the second shaft is rotatably connected to the sliding plate, external splines are provided at both ends of the second shaft, the first shaft and the second shaft body are connected to the second shaft body. The upper part is matched with an internal spline, which moves through the sliding plate, and the second shaft is connected to the first shaft or the third shaft; a vortex spring is provided on the sliding plate, the middle part of the vortex spring is connected to the second shaft, the outer part of the vortex spring is connected to the sliding plate, the first pulley is connected to the third shaft, and the storage assembly includes a storage cylinder, a fixed tube, a second pulley and a third pulley, and the storage cylinder is arranged in front of the main body through the fixed tube, and a second pulley that can rotate synchronously is provided on one side of the storage cylinder, and the third pulley is provided below the second pulley, a first belt is provided between the first pulley and the third pulley, and a second belt is provided between the second pulley and the third pulley. When the storage cylinder rotates, the third shaft rotates.

[0006] In the above scheme, preferably, a first cavity is provided in the storage tube, the first pressing member and the second pressing member are slidably connected in the first cavity, the first pressing block and the second pressing block are connected to the storage tube through a first elastic member, and a first inclined block is also provided in the first cavity, and a first inclined surface and a second inclined surface matching the first inclined block are provided on the first pressing block and the second pressing block. When the first pressing block and the second pressing block move toward the storage tube, the first inclined block moves toward the inside of the storage tube; the first inclined block is connected to the first magnet through a pull rope, and the first magnet is slidably connected to the first rod and the fixed tube, and the sliding plate is connected to the inside of the first rod through a second elastic member on the side facing the third axis. When the first pressing block and the second pressing block move away from the storage tube, the first magnet moves toward the first rod under the action of the pull rope, and the sliding plate overcomes the second elastic member under the action of magnetic force and moves toward the first magnet and is spline-connected to the first shaft.

[0007] In the above scheme, it is preferred that a second rod is vertically arranged in the middle of the first rod, the main body is placed between the first rod and the second rod, the third pulley is rotatably connected to the second rod, and two groups of adjacent grooves are provided on the third pulley, and the two groups of grooves are used to place the first belt and the second belt.

[0008] In the above solution, preferably, a handle is provided on the first rod, and a limiter is provided on the second rod. When the main body is placed horizontally on the ground, the first roller, the second roller and the limiter are placed in the same plane, and the main body is stably placed on the ground.

[0009] In the above scheme, it is preferred that a pipe is wrapped around the storage cylinder, an outlet is provided on the main body, and a connecting pipe is provided on the storage cylinder, the first connecting pipe includes a first connecting port and a second connecting port provided at the center of the storage cylinder, the outlet is connected to the first connecting port, and one end of the pipe is connected to the second connecting port. When the other end of the pipe is pulled, the storage cylinder rotates during the elongation of the pipe.

[0010] In the above scheme, preferably, the main body also includes a guide assembly for steering, the guide assembly includes a guide wheel, a guide rod and a disc, the disc is arranged at one end of the guide rod, the guide rod is connected to the guide wheel, and an annular member is arranged on the disc, and the pipe passes through the annular member.

[0011] In the above solution, preferably, the guide wheel includes a third roller and a front fork, the front fork is rotatably connected to the third roller, the front fork is connected to the guide rod, and the guide rod is rotatably connected to the second rod.

[0012] In the above scheme, preferably, the limit member is slidably arranged in the second rod, a third elastic member is provided between the limit member and the second rod, a second inclined block is slidably arranged in the second rod, and a third inclined surface is provided on the limit member. When the second inclined block moves toward the side of the second axis, under the action of the third elastic member, the limit member moves toward the side of the second rod.

[0013] In the above solution, preferably, a connecting plate is provided above the sliding plate, and the connecting plate passes through the second rod and is connected to the second oblique block.

[0014] In the above solution, preferably, the first magnet is arranged in the fixing tube through a fourth elastic member.

[0015] The beneficial effects of the present invention are: during the release of the pipeline, the second shaft and the volute spring in the force storage component can be deformed to achieve force storage, so that when the pipeline is exhausted and the pipeline needs to be pulled hard to drive the main body to move synchronously, under the action of the storage component, the first roller and the volute spring are connected, and the torque released by the volute spring is combined with the pulling force used. The pulling force is greatly reduced, and the pulling force at the pipeline interface is greatly reduced, thereby reducing the risk of damage to the pipeline interface, reducing the user's pulling force, improving user experience, and being more suitable for the sprayer main body to work outdoors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic structural diagram of the power storage component of the present invention.

[0018] Figure 3 This is a schematic diagram of the interior of the power storage component of the present invention.

[0019] Figure 4 It is a structural schematic diagram of the guide component and the storage component of the present invention.

[0020] Figure 5 This is a diagram of the internal structure of the storage component of the present invention.

[0021] Figure 6 for Figure 5 Enlarged view of point A.

[0022] Figure 7 It is a schematic diagram of the internal structure of the connecting plate, the second inclined block and the limiting member of the present invention.

[0023] Figure 8 It is a schematic structural diagram of the position limiting member and the second rod of the present invention.

[0024] Figure 9 It is a side view of the present invention.

[0025] Figure 10 This is a diagram showing the internal structure of the storage tube of the present invention.

[0026] Figure 11 This is a diagram showing the connection relationship between the guide rod and the second rod of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0028] See also Figures 1-11 An electric foam sprayer includes a foam sprayer body 1, the body 1 includes a moving component, the moving component is used for the displacement of the body 1, and the moving component includes a first roller 2, a second roller 3 and a first rod 4, the moving component is arranged directly below the body 1, the first rod 4 is connected to the body 1, and the first roller 2 and the second roller 3 are respectively arranged on both sides of the first rod 4. When the rollers rotate, the body 1 can be displaced.

[0029] An outlet 30 is provided on the main body 1, and the outlet 30 is connected to one end of the first tube body 45. The other end of the first tube body 45 is connected to a storage assembly for placing the pipe of the main body 1. The storage assembly includes a storage cylinder 13 and a fixed tube 14. The fixed tube 14 includes two groups of hollow tubes. The hollow tubes are symmetrically arranged on both sides of the first rod 4, and the storage cylinder 13 is rotated and arranged above the fixed tubes 14.

[0030] A connecting tube 31 is provided on either side of the storage tube 13, and the connecting tube 31 includes a first connecting port 32 and a second connecting port 33. The first connecting port 32 corresponds to the center of the storage tube 13, and the second connecting port 33 is located on the storage tube 13, so that the first tube body 45 is rotatably and sealingly connected to the first connecting port 32. Preferably, the first tube body 45 is connected to the first connecting port 32 through a rotating interface, that is, when the storage tube 13 rotates, the connecting tube 31 can rotate with the storage tube 13 while maintaining sealing under the action of the rotating interface.

[0031] The pipe is placed and wound around the storage tube 13 and connected to the main body 1 through the connecting pipe 31 and the first pipe body 45, so that when the main body 1 is started, the pipe can spray out the foam spray.

[0032] Connect the rollers of any group of moving components to the force storage component. In this embodiment, the first roller 2 and the matching first shaft 5 are connected to the force storage component. The force storage component includes a second shaft 6, a spiral spring 7, a sliding plate 8, a third shaft 9 and a first pulley 10. One end of the first shaft 5 is connected to the first roller 2, and the other end is located inside the first rod 4. The second shaft 6 is set on one side of the first shaft 5, and the third shaft 9 is set on one side of the second shaft 6. Figure 3 and Figure 4 As seen in the position relationship diagram of the first shaft 5, the second shaft 6 and the third shaft 9, external splines 11 are provided at both ends of the second shaft 6, an internal spline 12 is provided on the side of the first shaft 5 facing the second shaft 6, and an internal spline 12 is provided on the side of the three shafts facing the second shaft 6, and the second shaft 6 can form a spline connection with the first shaft 5 and the second shaft 6, while ensuring that the second shaft 6 can only be connected to one of its shafts at a time.

[0033] Since the second shaft 6 needs to be moved before it can be connected to the first shaft 5 or the third shaft 9, the sliding plate 8 is slidably connected inside the first rod 4, and the second shaft 6 is rotatably connected to the sliding plate 8. Therefore, when the sliding plate 8 moves, the second shaft 6 can still rotate. At the same time, the spiral spring 7 is arranged between the second shaft 6 and the sliding plate 8. Furthermore, the second shaft 6 is fixed to the middle part of the spiral spring 7, and the outside of the spiral spring 7 is fixed to the sliding plate 8. Therefore, when the direction of rotation of the second shaft 6 is the same as the direction of force storage of the spiral spring 7, the spiral spring 7 can store force.

[0034] See also Figure 2 A first pulley 10 is provided on the third shaft 9, a third pulley 16 is provided on the storage cylinder 13 located on the opposite side of the connecting tube 31, and a second pulley 15 is provided below the third pulley 16. A first belt 18 is tensioned between the first pulley 10 and the third pulley 16, and a second belt 17 is tensioned between the second pulley 15 and the third pulley 16. Preferably, two groups of grooves for placing belts are provided on the third pulley 16, and the two groups of grooves are adjacent to each other.

[0035] When the storage cylinder 13 drives the second pulley 15 to rotate, the third pulley 16 rotates under the action of the first belt 18, and the first pulley 10 rotates under the action of the second belt 17, that is, the third shaft 9 rotates.

[0036] In order to realize the connection between the first roller 2 and the spiral spring 7 after completing the force storage, a second elastic member 25 is provided between the side of the sliding plate 8 facing the third shaft 9 and the inside of the first rod 4. When the second elastic member 25 is not acted upon by an external force, the second shaft 6 is spline-connected to the third shaft 9. At this time, the second shaft 6 rotates with the third shaft 9. The direction of rotation of the third shaft 9 at this time is set to be consistent with the force storage direction of the spiral spring 7, thereby realizing the force storage of the spiral spring 7.

[0037] A first pressing block 19 and a second pressing block 20 are provided in the storage tube 13. Figure 10 A first cavity is provided in the storage tube 13, and the first pressing block 19 and the second pressing block 20 are connected to the storage tube 13 through a plurality of first elastic members 21. Furthermore, the first pressing block 19 and the second pressing block 20 slide inside the first cavity in the storage tube 13, and the sliding direction is Figure 10In order to slide up and down, a first inclined block 22 is set in the first cavity, and the first inclined block 22 has two sets of inclined edges. The first inclined surface and the second inclined surface are matched with the two sets of inclined edges of the first inclined block 22 on the first pressing block 19 and the second pressing block 20. That is, when the first pressing block 19 and the second pressing block 20 move away from the storage tube 13 at the same time, the first inclined block 22 is no longer restricted by the first pressing block 19 and the second pressing block 20.

[0038] See also Figure 5 A pull rope 23 is provided in the fixed tube 14 near the first inclined block 22. One end of the pull rope 23 is connected to the first inclined block 22, and the other end is connected to the first magnet 24. The first magnet 24 can slide in the fixed and first rod 4 bodies. Figure 6 , the fixed tube 14 is connected to the first elastic through the fourth elastic member 26. When the pull rope 23 is gradually relaxed, the first magnet 24 moves toward the inside of the first rod 4 under the action of the fourth elastic member 26. When the first magnet 24 is located inside the first rod 4, the sliding plate 8 moves toward the first magnet 24 under the action of magnetic force. Therefore, the material of the sliding plate 8 can be selected as a magnetic metal or a magnet with an opposite polarity to the first magnet 24. The sliding plate 8 overcomes the second elastic member 25 and moves toward the first shaft 5 to realize the spline connection between the second shaft 6 and the first shaft 5. When the instructions are needed, when the first magnet 24 enters the first rod 4, the magnets are located on both sides of the first shaft 5.

[0039] See also Figure 1 A handle 28 is provided on the first rod 4, and the handle 28 is provided on the opposite side of the fixed tube 14. Generally, after holding the handle 28 and rotating the main body 1 toward the handle 28, the main body 1 can be moved by the first roller 2 and the second roller 3. For the stability of the main body 1 when it is stationary, see Figure 9 A second rod 27 is vertically arranged in the middle of the first rod 4. Further, a limiter 29 is provided on the second rod 27. When the first roller 2, the second roller 3 and the limiter 29 are located in the same plane, the main body 1 is stationary on the ground.

[0040] Since the main body 1 that needs to be moved again may have a problem of changing direction, a guide assembly is set on the second rod 27 to solve the above problem. The guide assembly is set on one side of the limit member 29, and the guide assembly includes a guide wheel, a guide rod 34 and a disc 35. The disc 35 and the guide rod 34 are fixedly connected. The guide rod 34 passes through the second rod 27 and is connected to the guide wheel. The guide wheel includes a third roller 37, a front fork 38 and a fixing part. The third roller 37 is rotatably connected to the inside of the front fork 38 through a rotating shaft. The front fork 38 is connected to the guide rod 34, so that when the original disk rotates, the guide rod 34 and the guide wheel rotate synchronously.

[0041] In order to determine how the disc 35 rotates, a ring 36 is provided on the disc 35, and the pipe wound on the storage tube 13 is passed through the ring 36. The ring 36 is detachably connected to the disc 35. Preferably, the ring 36 can be connected to the disc 35 by bolts. When the user drives the pipe to rotate, the disc 35 rotates adaptively, thereby realizing the rotation of the guide wheel.

[0042] For further information, see Figure 11 A clamping block 43 can be provided between the second rod 27 and the guide rod 34 for rotating the guide rod 34. A protrusion 44 is provided on the guide rod 34, and two groups of clamping blocks 43 are provided inside the second rod 27. The angle between the clamping block 43 and the second protrusion 44 is 20, that is, the range of rotation of the disc 35 is 0-20 degrees counterclockwise and 0-20 degrees clockwise. If the placement angle is too large, the main body 1 will not move.

[0043] See also Figure 9 To move the main body 1 again, the first roller 2, the second roller 3 and the third roller 37 that has changed its direction need to be in the same plane before the main body 1 can be moved. Figure 7 A connecting plate 42 is provided on the top of the first rod 4 , and the connecting plate 42 is connected to the top of the sliding plate 8 . The connecting plate 42 also slides in the second rod 27 . When the sliding plate 8 changes its position, the connecting plate 42 changes its position together.

[0044] See also Figure 8 The limiting member 29 is slidably connected to the second rod 27. A third elastic member 39 is provided between the second rod 27 and the limiting member 29. A third inclined surface 41 is provided above the limiting rod and is connected to the second inclined block 40 with the connecting plate 42. The relationship between the second inclined block 40 and the third inclined surface 41 is as follows: Figure 8 As can be seen, when the connecting plate 42 and the sliding plate 8 move synchronously away from the second rod 27, under the action of the third elastic member 39, the limiting member 29 moves upward, that is, the first roller 2, the second roller 3 and the third roller 37 are located in the same plane.

[0045] Working principle: When the foam sprayer body 1 is pushed outdoors for work, the pipe wound in the storage cylinder 13 is connected to the spray gun through the annular member 36. When the user moves forward, the pipe is stretched while the storage cylinder 13 keeps rotating, and the storage cylinder 13 drives the second pulley 15 to rotate. Under the action of the first belt 18, the third pulley 16, the second belt 17 and the first pulley 10, the third shaft 9 connected to the first pulley 10 will continue to rotate. Since the pull rope 23 is wound around the storage cylinder 13, the first pressing block 19 and the second pressing block 20 are always located in the storage cylinder 13, that is, the first magnet 24 is always located in the fixed tube 14. Under the action of the second elastic member 25, the second shaft 6 and the third shaft 9 are spline-connected, and the second shaft 6 keeps rotating, that is, the volute spring 7 keeps storing force.

[0046] When there is no pipe wound on the storage tube 13, the first pressing block 19 and the second pressing block 20 move away from the storage tube 13 under the action of the first elastic member 21, and the first inclined block 22 moves toward the pull rope 23. When the pull rope 23 is relaxed, the first magnet 24 moves toward the inside of the first rod 4. Under the action of the sliding plate 8 and the magnetism, the sliding plate 8 overcomes the second elastic member 25 and drives the second shaft 6 to move toward the first magnet 24. When the second shaft 6 is separated from the third shaft 9 and moves toward the first shaft 5, the second shaft 6 rotates and is adapted to be spline-connected with the first shaft 5. However, under the gravity of the main body 1, the first roller 2 does not move.

[0047] At the same time, the movement of the sliding plate 8 drives the connecting plate 42 and the second inclined block 40 to move synchronously away from the second rod 27. Under the action of the third elastic member 39, the limit member 29 moves toward the second inner side. At this time, the third roller 37 matching the user's direction falls to the ground. At this time, if the pipe needs to be pulled further, the first roller 2, the second roller 3 and the third roller 37 located in the same plane move in the direction of the third roller 37. Under the action of the spiral spring 7, when the main body 1 is pulled, the spiral spring 7 is released to drive the first roller 2 to rotate, so that the user can use a smaller pulling force to drive the main body 1 to move, and the pulling force at the pipe interface is smaller during the continuous time, so that the pipe interface is not easily damaged.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An electric foam sprayer, comprising a foam sprayer body, the body comprising a moving assembly for movement of the body and a receiving assembly for placement of a pipe of the body, characterized in that: The moving assembly includes a first roller, a second roller and a first rod, wherein the first roller and the second roller are connected to both ends of the first rod through a first shaft; A force storage assembly is provided in the first rod, and the force storage assembly includes a second shaft, a volute spring, a sliding plate, a third shaft and a first pulley. The first shaft is provided on one side of the second shaft, and the third shaft is provided on the other side of the second shaft. The second shaft is rotatably connected to the sliding plate. External splines are provided at both ends of the second shaft. Internal splines are matched on the first shaft and the second shaft body. The second shaft is moved by the sliding plate, and is connected to the first shaft or the third shaft. A vortex spring is provided on the sliding plate, the middle part of the vortex spring is connected to the second shaft, the outer part of the vortex spring is connected to the sliding plate, the first pulley is connected to the third shaft, the storage assembly includes a storage cylinder, a fixed tube, a second pulley and a third pulley, the storage cylinder is arranged in front of the main body through the fixed tube, a second pulley that can rotate synchronously is provided on one side of the storage cylinder, the third pulley is provided below the second pulley, a first belt is provided between the first pulley and the third pulley, and a second belt is provided between the second pulley and the third pulley, and when the storage cylinder rotates, the third shaft rotates; A first cavity is provided in the storage cylinder, and a first pressing block and a second pressing block are slidably connected in the first cavity. The first pressing block and the second pressing block are connected to the storage cylinder via a first elastic member. A first inclined block is also provided in the first cavity, and a first inclined surface and a second inclined surface matching the first inclined block are provided on the first pressing block and the second pressing block. When the first pressing block and the second pressing block move toward the storage cylinder, the first inclined block moves toward the interior of the storage cylinder. The first inclined block is connected to the first magnet via a pull rope, and the first magnet is slidably connected to the first rod and the fixed tube. The side of the sliding plate facing the third axis is connected to the inside of the first rod via a second elastic member. When the first pressing block and the second pressing block move away from the storage cylinder, the first magnet moves into the first rod under the action of the pull rope, and the sliding plate overcomes the second elastic member under the action of magnetic force and moves toward the first magnet to be spline-connected to the first axis. A second rod is vertically arranged in the middle of the first rod, the main body is placed between the first rod and the second rod, the third pulley is rotatably connected to the second rod, and two groups of adjacent grooves are arranged on the third pulley, and the two groups of grooves are used to place the first belt and the second belt.

2. An electric foam sprayer according to claim 1, characterized in that: A hand-held portion is provided on the first rod, and a limiting piece is provided on the second rod. When the main body is placed horizontally on the ground, the first roller, the second roller and the limiting piece are placed on the same plane, and the main body is stably placed on the ground.

3. The electric foam sprayer according to claim 1, characterized in that: A pipe is wound around the storage cylinder, an outlet is provided on the main body, and a connecting pipe is provided on the storage cylinder. The first connecting pipe includes a first connecting port and a second connecting port provided at the center of the storage cylinder. The outlet is connected to the first connecting port, and one end of the pipe is connected to the second connecting port. When the other end of the pipe is pulled, the storage cylinder rotates during the elongation of the pipe.

4. An electric foam sprayer according to claim 3, characterized in that: The main body also includes a guide assembly for steering, the guide assembly includes a guide wheel, a guide rod and a disc, the disc is arranged at one end of the guide rod, the guide rod is connected to the guide wheel, an annular member is arranged on the disc, and the pipeline passes through the annular member.

5. The electric foam sprayer according to claim 4, characterized in that: The guide wheel includes a third roller and a front fork, the front fork is rotatably connected to the third roller, the front fork is connected to the guide rod, and the guide rod is rotatably connected to the second rod.

6. The electric foam sprayer according to claim 2, characterized in that: The limiting member is slidably arranged in the second rod, a third elastic member is provided between the limiting member and the second rod, a second inclined block is slidably arranged in the second rod, and a third inclined surface is provided on the limiting member. When the second inclined block moves toward the side of the second axis, the limiting member moves toward the side of the second rod under the action of the third elastic member.

7. An electric foam sprayer according to claim 6, characterized in that: A connecting plate is provided above the sliding plate, and the connecting plate passes through the second rod and is connected to the second inclined block.

8. The electric foam sprayer according to claim 1, characterized in that: The first magnet is arranged in the fixing tube through a fourth elastic member.

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