Waterproof roof device and open top container

Abstract

The application discloses a waterproof top cover device and an open-top container. Through cooperation of a blade device, a side rail assembly and a driving assembly, the waterproof top cover device can realize stable and reliable waterproof effect on the open-top container and is simple to operate and saves time and effort.

Description

Technical Field

[0001] This invention relates to a waterproof roof device and an open-top container. Background Technology

[0002] An open-top container is a type of container with an open top, often used for transporting bulk cargo (such as grain). To prevent the cargo from getting wet from rain, a tarpaulin is typically used to cover the open top of the container.

[0003] The tarpaulin system consists of a tarpaulin, support poles, and tie ropes. The tarpaulin is a waterproof material with good toughness, generally made of high-strength polyester filament woven fabric coated with polyvinyl chloride. The tarpaulin covers the support poles to prevent rainwater from seeping in. The support poles are installed on the support pole seats inside the upper side beams of the open-top container, and the support poles provide a certain rigidity to the tarpaulin. One end of the tie rope is fastened to the tarpaulin's lanyard, and the other end is connected to the rope loops on the side and top canopy panels of the container to secure the tarpaulin.

[0004] Because tarpaulins are relatively soft, when covering the top of open-top containers, they can sag between the support poles during rain, creating grooves. Heavy or torrential rain can cause significant water accumulation on the tarpaulin, potentially damaging it. Damaged tarpaulins allow rainwater to seep into the container, leading to damp cargo and unnecessary economic losses. Furthermore, installing tarpaulins involves a complex process: first, installing the support poles, then covering the tarpaulin, and finally securing the ropes. This requires frequent climbing by personnel, is time-consuming and labor-intensive, reduces efficiency and safety, and prolongs container turnaround time. Summary of the Invention

[0005] This invention provides a waterproof roof device and an open-top container.

[0006] The technical solution of the present invention is: a waterproof top cover device, comprising: a blade device, a side rail assembly, and a drive assembly;

[0007] The blade assembly includes multiple blade groups extending along a first direction, multiple support beams, multiple first waterproof strips, and multiple second waterproof strips. The multiple blade groups are arranged sequentially along a second direction, with the first direction perpendicular to the second direction. Each blade group includes a left blade, a middle blade, and a right blade extending along the first direction. The left blade, the middle blade, and the right blade are arranged sequentially along the second direction and rotatably connected to each other. The direction of the rotation axis is the first direction. Each support beam is located below the connection point of a pair of adjacent blade groups and extends along the first direction. In a pair of adjacent blade groups, the left blade and the right blade are close to each other. The right blades are rotatably connected to the corresponding support beams, and the extension direction of the rotation axis is the first direction. The first waterproof strip is made of elastic material, extends along the first direction, and is attached to the connection area of ​​the left and right blades that are close to each other in each pair of adjacent blade groups. The second waterproof strip is made of elastic material, extends along the first direction, and is fixedly connected to both sides of the middle blade. When the blade group is unfolded, the exposed part of the second waterproof strip is always in contact with the left or right blade. The rotatable connection part of the middle blade with the corresponding left and right blades is located between the corresponding two second waterproof strips.

[0008] The side rail assembly includes two rails spaced apart and extending along the second direction, the two rails providing support to both ends of the support beam and allowing the support beam to move along the second direction;

[0009] The drive assembly is used to pull one of the outermost beams among the plurality of beams to move bidirectionally along the second direction.

[0010] Optionally, in the same blade group, the ends of the left blade and the right blade facing away from each other are fixedly connected to cylindrical bolts extending along the first direction;

[0011] The upper part of the support beam forms two cylindrical hollow regions extending along the first direction. Each cylindrical hollow region has an opening at at least one end for the cylindrical bolt to be inserted into. The upper part of the cylindrical hollow region has a notch extending along the first direction to provide rotation space for the connection between the cylindrical bolt and the corresponding left or right blade.

[0012] Optionally, in the same blade group, the left blade and the right blade are fixedly connected to each other at their ends by cylindrical bolts extending along the first direction. The lower surface of the middle blade is provided with two cylindrical hollow regions extending along the first direction. Each cylindrical hollow region has an opening at at least one end for the cylindrical bolt to be inserted into the cylindrical hollow region. The lower part of the cylindrical hollow region has a notch extending along the first direction to provide rotation space for the connection between the cylindrical bolt and the corresponding left or right blade.

[0013] Optionally, the middle blade has two cavities extending along the first direction, the cavities being located outside the connection positions of the left blade and the right blade with the middle blade, the lower part of the cavity having a notch extending along the first direction, the upper part of the second waterproof strip being located within the cavity, and at least when the blade assembly is unfolded, the lower part of the second waterproof strip being in compression contact with one of the corresponding left blade and the right blade.

[0014] Optionally, rollers are provided at both ends of the support beam, and the rollers roll and move on corresponding tracks.

[0015] Optionally, the drive assembly includes an annular chain, a connector, and a power source. The power source drives the chain to move bidirectionally. The movement direction of the part of the chain that contacts the connector is the second direction. The connector is fixed to the chain, and the connector is fixedly connected to one of the outermost support beams among the plurality of support beams.

[0016] Optionally, the track is a side rail profile, the side rail having a channel extending along the second direction, the chain passing through the channel, and the roller moving within the channel.

[0017] Optionally, the drive assembly includes an electric drive assembly and / or a manual drive assembly.

[0018] The technical solution of the present invention is: an open-top container, including the above-mentioned waterproof top cover device.

[0019] Optionally, the open-top container has two upper side beams extending along the second direction, the first direction being the width direction of the open-top container and the second direction being the length direction of the open-top container. The two ends of the left blade, the middle blade and the right blade are flush with the boundary of the upper surface of the upper side beam opposite to the other upper side beam, and the side rails are fixed to the surface of the upper side beam facing the other upper side beam.

[0020] When the waterproof top cover is opened, the first and second waterproof strips work together to provide a reliable waterproof effect, and the blade device is easy to open and close, saving time and effort. Attached Figure Description

[0021] Figure 1 This is a perspective view of the blade assembly of the waterproof roof device in the open-top container of the present invention in the deployed state.

[0022] Figure 2 This is a perspective view of the blade assembly of the waterproof roof device in the open-top container of the present invention in a retracted state, omitting the upper side beam.

[0023] Figure 3 This is a perspective view of the open-top container of the present invention after omitting the blade assembly.

[0024] Figure 4 This is a cross-sectional view of the waterproof top cover device of the present invention, the cross-section being perpendicular to the length direction of the open-top container.

[0025] Figure 5 yes Figure 4 Enlarged view of area A.

[0026] Figure 6 This is a magnified view of a portion of the blade assembly.

[0027] Figure 7 yes Figure 6 A magnified view of a portion of the image.

[0028] Figure 8 This is a cross-sectional view of a portion of the structure of the waterproof top cover device of the present invention, the cross-sectional view being perpendicular to the width direction of the open-top container.

[0029] Figure 9 This is a cross-sectional view of a portion of the waterproof top cover device of the present invention, which is perpendicular to the length direction of the open-top container.

[0030] The attached diagram is labeled as follows: 1. Open-top box body; 11. Upper side beam; 111. L-shaped guard plate; 2. Blade assembly; 3. Side rail assembly; 4. Electric drive assembly; 5. Manual drive assembly; 6. Control box; 21. Blade group; 22. Support beam; 23. Roller; 24. First waterproof strip; 25. Second waterproof strip; 26. Left blade; 27. Middle blade; 28. Right blade; 29. ​​Connecting rod; 31. Side rail profile; 32. First transmission gear; 33. Second transmission gear; 34. Chain; 35. Connector; 36. Sealing strip; 41. Crossbeam; 42. Third transmission gear; 43. Fourth transmission gear; 44. First transmission rod; 45. Second transmission rod; 51. First right-angle gearbox; 52. Third transmission rod; 53. Second right-angle gearbox; 54. Fourth transmission rod; 55. Third right-angle gearbox; 56. Fifth transmission rod; 57. Handwheel. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0032] Note: The vertical positional relationship described in this invention refers to the usage state when the blade assembly is flattened.

[0033] refer to Figures 1 to 9 The present invention provides a waterproof top cover device and an open-top container 1 including the waterproof top cover device.

[0034] The waterproof top cover device includes: blade assembly 2, side rail assembly 3, and drive assembly.

[0035] The blade assembly 2 includes multiple blade groups 21 extending along a first direction, multiple support beams 22, multiple first waterproof strips 24 and multiple second waterproof strips 25. The multiple blade groups 21 are arranged sequentially along a second direction, and the first direction is perpendicular to the second direction.

[0036] Figures 1 to 9 In the embodiment shown, the first direction is the width direction of the open-top container 1, and the second direction is the length direction of the open-top container 1.

[0037] The blade assembly 21 includes a left blade 26, a middle blade 27, and a right blade 28 extending along a first direction. The left blade 26, middle blade 27, and right blade 28 are arranged sequentially along a second direction and rotatably connected to each other. The direction of the rotation axis is the first direction. Each support beam 22 is located below the connection point of a pair of adjacent blade assemblies 21 and extends along the first direction. The left blade 26 and right blade 28 of a pair of adjacent blade assemblies 21 that are close to each other are rotatably connected to their corresponding support beams 22. The direction of the rotation axis is the first direction. The first waterproof strip 24 is made of elastic material and extends along the first direction. Extending and covering the connection area of ​​the left blade 26 and right blade 28 that are close to each other in each pair of adjacent blade groups 21, the second waterproof strip 25 is made of elastic material, extends along the first direction, and is fixedly connected to both sides of the middle blade 27. When the blade group 21 is flattened, the exposed part of the second waterproof strip 25 is pressed into contact with the left blade 26 or right blade 28 (the pressed contact part extends along the first direction to both ends of the blade group 21). The rotating connection part of the middle blade 27 with the corresponding left blade 26 and the corresponding right blade 28 is located between the corresponding two second waterproof strips 25.

[0038] The side rail assembly 3 includes two rails spaced apart and extending along the second direction. The two rails provide support for both ends of the support beam 22 and allow the support beam 22 to move along the second direction.

[0039] The drive assembly is used to pull one of the multiple support beams 22 located at the outermost position to move bidirectionally in a second direction.

[0040] In use, the outermost left blade 26 (or right blade 28) of the outermost blade group 21 connected to the outermost blade 22 of the multiple support beams 22 is rotatably connected to the upper end beam of the open-top container 1, and the extension direction of the rotation axis is the first direction.

[0041] Optionally, refer to Figure 6 In the same blade group 21, the ends of the left blade 26 and the right blade 28 facing away from each other are fixedly connected by cylindrical bolts extending in a first direction.

[0042] The upper part of the support beam 22 forms two cylindrical hollow regions extending in a first direction. At least one end of each cylindrical hollow region has an opening for inserting a cylindrical bolt into the cylindrical hollow region. The upper part of the cylindrical hollow region has a notch extending in the first direction to provide rotation space for the connection between the cylindrical bolt and the corresponding left blade 26 or right blade 28.

[0043] Optionally, refer to Figure 7 In the same blade group 21, the left blade 26 and the right blade 28 are fixedly connected to the ends of each other by cylindrical bolts extending in a first direction. The lower surface of the middle blade 27 is provided with two cylindrical hollow regions extending in the first direction. At least one end of the cylindrical hollow region has an opening for the cylindrical bolt to be inserted into the cylindrical hollow region. The lower part of the cylindrical hollow region has a notch extending in the first direction to provide rotation space for the connection between the cylindrical bolt and the corresponding left blade 26 or right blade 28.

[0044] Optionally, continue to refer to Figure 7 The middle blade 27 has two cavities extending along a first direction. The cavities are located outside the connection positions of the left blade 26 and the right blade 28 with the middle blade 27. The lower part of the cavity has a notch extending along the first direction. The upper part of the second waterproof strip 25 is located inside the cavity. At least when the blade assembly 21 is unfolded, the lower part of the second waterproof strip 25 is in compressive contact with one of the corresponding left blade 26 and right blade 28.

[0045] Optionally, refer to Figures 3 to 5 Rollers 23 are provided at both ends of the support beam 22, and the rollers 23 roll and move on the corresponding tracks.

[0046] Optionally, refer to Figure 3 , Figure 4 and Figure 8 The drive assembly includes a ring-shaped chain 34, a connector 35, and a power source. The power source is used to drive the chain 34 to move in both directions. The movement direction of the part of the chain 34 that contacts the connector 35 is the second direction. The connector 35 is fixed on the chain 34 and is fixedly connected to one of the multiple support beams 22 located at the outermost position.

[0047] Specifically, each end of the support beam 22 is connected to a protruding section (not shown, for example, a metal sheet) that protrudes along a first direction, and the protruding section is welded to the connector 35.

[0048] Optionally, refer to Figure 4 and Figure 5 The track is a side rail profile 31, which has a channel extending in a second direction. The chain 34 passes through the channel, and the roller 23 moves within the channel.

[0049] Specifically, the support beam 22 is fixedly connected to the connecting rod 29. The extension direction of the connecting rod 29 is the first direction. Both ends of the connecting rod 29 extend into the channel (specifically the cavity) of the side rail profile 31. The roller 23 is set at the end of the connecting rod 29 and rolls in the cavity of the side rail profile 31.

[0050] The connecting rod 29 moves between the upper and lower sealing strips 36. The connecting rod 29 is squeezed between the upper and lower sealing strips 36. During the movement of the connecting rod 29, the parts of the upper and lower sealing strips 36 that are not in contact with the connecting rod 29 are tightly pressed together, thereby preventing goods from entering the side rail profile 31.

[0051] Optionally, the drive assembly includes an electric drive assembly 4 and / or a manual drive assembly 5.

[0052] The embodiments of the present invention include two driving components.

[0053] refer to Figure 3 , Figure 8 and Figure 9 The motor in the electric drive assembly is fixed to the end of the open-top container 1. A crossbeam 41 is used to fix the electric drive assembly. The crossbeam 41 is fixed inside the open-top container 1. The motor's output shaft is connected to a third transmission gear 42, driving the third connecting gear to rotate in both directions. The third connecting gear drives the fourth connecting gear to rotate. The two ends of the first transmission rod 44 are respectively connected to the fourth transmission gear 43 and a second transmission gear 33. The two ends of the second transmission rod 45 are respectively connected to the fourth transmission gear 43 and another second transmission gear 33. Thus, the rotation of the motor's output shaft is converted into the rotation of the second transmission gear 33, which in turn drives the chain 34 to rotate.

[0054] The forward and reverse rotation of the motor can be controlled by buttons (not shown) or knobs (not shown) on the control box 6. The control box 6 is mounted on the side of the open-top container 1 for manual operation by the user. The motor is connected to the control box 6 by a wire.

[0055] Continue to refer to Figure 9Handwheel 57 is located inside the control box 6 but protrudes externally. Handwheel 57 is fixedly connected to the fifth transmission rod 56. The fifth transmission rod 56 is connected to the fourth transmission rod 54 via the third right-angle gearbox 55. The extension direction of the fifth transmission rod 56 is the first direction (in this embodiment, the width direction of the open-top container 1). The extension direction of the fourth transmission rod 54 is the height direction of the open-top container 1. The fourth transmission rod 54 is then connected to the third transmission rod 52 via the second right-angle gearbox 53. The extension direction of the third transmission rod 52 is the first direction. The third transmission rod 52 converts its rotation direction to rotation around a vertically extending rotation axis via the first right-angle gearbox 51. The first right-angle gearbox 51 is ultimately connected to the output shaft of the motor (connection details are not shown). For example, the first right-angle gearbox 51 is ultimately connected to the third transmission gear 42 via other parts or connected to the inside of the motor.

[0056] The technical solution of the present invention is: an open-top container 1, including the above-mentioned waterproof top cover device.

[0057] Optionally, the open-top container 1 has two upper side beams 11 extending along a second direction, the first direction being the width direction of the open-top container 1 and the second direction being the length direction of the open-top container 1. The two ends of the left blade 26, the middle blade 27 and the right blade 28 are flush with the boundary of the upper surface of the upper side beam 11 facing away from the other upper side beam 11, and the side rail assembly 3 is fixed on the surface of the upper side beam 11 facing the other upper side beam 11.

[0058] Further, refer to Figure 5 An L-shaped guard plate 111 is provided between the upper side beam 11 and the side rail profile 31. The L-shaped guard plate 111 covers the surface of the upper side beam 11 facing the opposite side upper side beam 11 and the upper surface of the upper side beam 11. The L-shaped guard plate 111 is used to protect the upper side beam 11.

[0059] In another embodiment, the first direction is the length direction of the open-top container 1, and the second direction is the width direction of the open-top container 1.

[0060] The detailed operation process of the waterproof top cover is as follows.

[0061] refer to Figure 2 When the blade assembly 2 is in the retracted state, cargo is loaded into the open-top container 1.

[0062] After the cargo loading is completed, connect the three-hole socket in the control box 6 to the external power supply. The operator presses the first button in the control box 6, and the output shaft of the motor in the electric drive assembly rotates in the first direction.

[0063] refer to Figure 9The motor in the electric drive assembly drives the third transmission gear 42 to rotate, the third transmission gear 42 drives the fourth transmission gear 43 to rotate, and the fourth transmission gear 43 in turn drives the first transmission rod 44 and the second transmission rod 45 to rotate.

[0064] refer to Figure 8 The first transmission rod 44 and the second transmission rod 45 each drive a second transmission gear 33 to rotate. The rotation of the second transmission gear 33 drives the chain 34 to move. The movement of the chain 34 drives the connecting piece 35 to move in the direction of the unfolding blade device 2.

[0065] refer to Figure 6 The connector 35 drives the support beam 22 to move, and the support beam 22 drives the blade assembly 21 to move along the length of the open-top container 1. The left blade 26, the middle blade and the right blade 28 in the blade assembly 21 are rotatably connected to each other, and the three gradually rotate to a horizontally spread state.

[0066] refer to Figure 4 During the movement of the support beam 22, the support beam 22 drives the connecting rod 29 to move along the length of the open-top container 1, and the rollers 23 at both ends of the connecting rod 29 roll in the raceway inside the side rail profile 31. The sealing strip 36 isolates the particulate material inside the open-top container 1 from the side rail profile 31.

[0067] refer to Figure 1 Once the opening of the open-top container 1 is completely closed, the motor in the electric drive assembly 4 automatically stops rotating and locks. At this time, the farthest blade is in a retracted state, while the remaining blades are in an extended state. The farthest blade can also be manually flattened by the user, as long as the blade assembly 21 completely closes the opening of the open-top container 1.

[0068] When loading goods, connect the three-hole socket inside control box 6 to an external power source. The operator then presses the second button inside control box 6, causing the output shaft of the motor in the electric drive assembly to rotate in the second direction. The motor's output shaft will then rotate in the reverse direction.

[0069] refer to Figure 9 The motor in the electric drive assembly drives the third transmission gear 42 to rotate in the opposite direction, the third transmission gear 42 drives the fourth transmission gear 43 to rotate in the opposite direction, and the fourth transmission gear 43 in turn drives the first transmission rod 44 and the second transmission rod 45 to rotate in the opposite direction.

[0070] refer to Figure 8 The first transmission rod 44 and the second transmission rod 45 each drive a second transmission gear 33 to rotate in opposite directions. The rotation of the second transmission gear 33 causes the chain 34 to move in the opposite direction. The movement of the chain 34 causes the connecting piece 35 to move in the direction of the retractable blade device 2.

[0071] refer to Figure 6The connector 35 drives the support beam 22 to move in the opposite direction, and the support beam 22 drives the blade assembly 21 to move in the opposite direction along the length of the open-top container 1. The left blade 26, the middle blade and the right blade 28 in the blade assembly 21 are rotatably connected to each other, and the three gradually rotate to a folded state.

[0072] Once the opening of the open-top container 1 is fully opened, the motor in the electric drive assembly 4 automatically stops rotating and locks itself.

[0073] When an external power source is unavailable on-site, the operator manually rotates the handwheel 57 inside the control box 6. The rotation of handwheel 57 drives the fifth transmission rod 56, which in turn drives the fourth transmission rod 54 via the third right-angle gearbox 55. The fourth transmission rod 54 then drives the third transmission rod 52 via the second right-angle gearbox 53. The third transmission rod 52 is connected to the motor's output shaft via the first right-angle gearbox 51 (intermediate connection process omitted). Thus, the forward and reverse rotation of the motor's output shaft controls the unfolding and retraction of the blades.

[0074] The various embodiments in this invention are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0075] The scope of protection of this invention is not limited to the embodiments described above. Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its scope and spirit. If these modifications and variations fall within the scope of the claims of this invention and their equivalents, then the intent of this invention also includes these modifications and variations.

Claims

1. A waterproof top cover device, characterized in that, include: Blade assembly, side rail assembly, drive components; The blade assembly includes multiple blade groups extending along a first direction, multiple support beams, multiple first waterproof strips, and multiple second waterproof strips. The multiple blade groups are arranged sequentially along a second direction, with the first direction perpendicular to the second direction. Each blade group includes a left blade, a middle blade, and a right blade extending along the first direction. The left blade, the middle blade, and the right blade are arranged sequentially along the second direction and rotatably connected to each other. The direction of the rotation axis is the first direction. Each support beam is located below the connection point of a pair of adjacent blade groups and extends along the first direction. In a pair of adjacent blade groups, the left blade and the right blade are close to each other. The right blades are rotatably connected to the corresponding support beams, and the extension direction of the rotation axis is the first direction. The first waterproof strip is made of elastic material, extends along the first direction, and is attached to the connection area of ​​the left and right blades that are close to each other in each pair of adjacent blade groups. The second waterproof strip is made of elastic material, extends along the first direction, and is fixedly connected to both sides of the middle blade. When the blade group is unfolded, the exposed part of the second waterproof strip is always in contact with the left or right blade. The rotatable connection part of the middle blade with the corresponding left and right blades is located between the corresponding two second waterproof strips. The side rail assembly includes two rails spaced apart and extending along the second direction, the two rails providing support to both ends of the support beam and allowing the support beam to move along the second direction; The drive assembly is used to pull one of the outermost beams among the plurality of beams to move bidirectionally along the second direction.

2. The waterproof top cover device according to claim 1, characterized in that, In the same blade group, the ends of the left blade and the right blade facing away from each other are fixedly connected to cylindrical bolts extending along the first direction; The upper part of the support beam forms two cylindrical hollow regions extending along the first direction. Each cylindrical hollow region has an opening at at least one end for the cylindrical bolt to be inserted into. The upper part of the cylindrical hollow region has a notch extending along the first direction to provide rotation space for the connection between the cylindrical bolt and the corresponding left or right blade.

3. The waterproof top cover device according to claim 1, characterized in that, In the same blade group, the left blade and the right blade are fixedly connected to each other at their ends by cylindrical bolts extending along the first direction. The lower surface of the middle blade is provided with two cylindrical hollow regions extending along the first direction. Each cylindrical hollow region has an opening at at least one end for the cylindrical bolt to be inserted into the cylindrical hollow region. The lower part of the cylindrical hollow region has a notch extending along the first direction to provide rotation space for the connection between the cylindrical bolt and the corresponding left or right blade.

4. The waterproof top cover device according to claim 1, characterized in that, The middle blade has two cavities extending along the first direction. The cavities are located outside the connection positions of the left blade and the right blade with the middle blade. The lower part of the cavity has a notch extending along the first direction. The upper part of the second waterproof strip is located inside the cavity. At least when the blade assembly is unfolded, the lower part of the second waterproof strip is in compression contact with one of the corresponding left blade and the right blade.

5. The waterproof top cover device according to claim 1, characterized in that, Rollers are provided at both ends of the support beam, and the rollers roll and move on corresponding tracks.

6. The waterproof top cover device according to claim 5, characterized in that, The drive assembly includes a ring-shaped chain, a connector, and a power source. The power source drives the chain to move bidirectionally. The movement direction of the part of the chain that contacts the connector is the second direction. The connector is fixed to the chain and is fixedly connected to one of the outermost support beams among the plurality of support beams.

7. The waterproof top cover device according to claim 6, characterized in that, The track is a side rail profile, the side rail has a channel extending along the second direction, the chain passes through the channel, and the roller moves within the channel.

8. The waterproof top cover device according to claim 1, characterized in that, The drive assembly includes an electric drive assembly and / or a manual drive assembly.

9. An open-top container, characterized in that, The waterproof top cover device includes any one of claims 1 to 8.

10. The open-top container according to claim 9, characterized in that, The open-top container has two upper side beams extending along the second direction, the first direction being the width direction of the open-top container and the second direction being the length direction of the open-top container. The two ends of the left blade, the middle blade and the right blade are flush with the boundary of the upper surface of the upper side beam opposite to the other upper side beam. The side rails are fixed to the surface of the upper side beam facing the other upper side beam.

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