Automatic packaging and transferring frame for road transportation of large aircraft components

Abstract

The utility model discloses an automatic packaging transfer frame for road transportation of large aircraft components, and belongs to the technical field of aircraft transportation. The efficiency of the large aircraft component in the highway transportation process can be improved, the transportation cost is reduced, the product safety is improved, and the product transportation flexibility is improved. The box body comprises a fixed main box and two sliding type side boxes arranged on the left side and the right side of the fixed main box, the two sliding type side boxes are in sliding connection with the fixed main box through a plurality of guide mechanisms respectively, the two sliding type side boxes are driven by a plurality of driving mechanisms to move in a reciprocating mode in the left-right direction, and a plurality of lifting mechanisms are installed on the outer edge of the box body; a plurality of product bearing and fixing mechanisms are installed in the box body and used for loading products, waterproof tarpaulin covers the outer side of the box body, and a plurality of driving mechanisms are controlled by an electric control mechanism. The vehicle is used for highway transportation of oversized aircraft parts, has the function of automatically changing the size, can effectively solve challenges in transportation of oversized products, and improves transportation efficiency and safety.

Description

Technical Field

[0001] The utility model belongs to the technical field of aircraft transportation, and particularly relates to an automated container transfer rack for road transportation of large aircraft components. Background Art

[0002] With the economic development and globalization, and the growth of trade logistics demand, transportation, as the foundation of modern economic operation, connects all links in the supply chain. The transportation of large components is an even more important part, affecting the operation efficiency and cost control of the entire supply chain. However, the traditional road transportation of large aircraft components is inefficient, costly, insufficient in product protection, and poor in sustainability. The road transportation of large aircraft components has always been a thorny issue. Therefore, a simple, efficient, low-cost, highly safe, sustainable, flexible, environmentally friendly, and reliable transportation solution is needed to achieve the road transportation of large aircraft components. Summary of the Utility Model

[0003] The utility model aims to solve the problem of transporting large aircraft components, and further provides an automated container transfer rack for road transportation of large aircraft components, which can improve the efficiency of large aircraft components during road transportation, reduce transportation costs, enhance product safety, and increase the flexibility of product transportation.

[0004] The technical solution adopted by the utility model is as follows:

[0005] An automated container transfer rack for road transportation of large aircraft components includes a box body, an electric control mechanism, a waterproof tarpaulin, a plurality of driving mechanisms, a plurality of guiding mechanisms, a plurality of lifting mechanisms, and a plurality of product supporting and fixing mechanisms; the box body includes a fixed main box and two sliding side boxes arranged on the left and right sides of the fixed main box. The two sliding side boxes are respectively slidably connected to the fixed main box through a plurality of guiding mechanisms, and both sliding side boxes are driven by a plurality of driving mechanisms to reciprocate in the left-right direction. A plurality of lifting mechanisms are installed on the outer edge of the box body, and a plurality of product supporting and fixing mechanisms are installed inside the box body for loading products. A waterproof tarpaulin is covered outside the box body, and a plurality of driving mechanisms are controlled by the electric control mechanism.

[0006] The utility model has the following beneficial effects compared with the prior art:

[0007] The utility model can improve the efficiency of large aircraft components during road transportation, reduce transportation costs, enhance product safety, and increase the flexibility of product transportation. The importance of this technology is not only reflected in economic benefits and technological innovation, but also related to the sustainable development of the warehousing and transportation industry and the improvement of the efficiency and safety of the global supply chain.

[0008] The utility model is used for the road transportation of extra-large aircraft components and has the function of automatically changing size, which can effectively solve the challenges in the transportation of extra-large products and improve the transportation efficiency and safety.

[0009] The utility model can reduce the errors and risks of manual operation, thereby improving the loading and unloading efficiency and transportation safety. The container body can automatically increase its length and width, and can be used in the ultra-wide and ultra-long state to meet the transportation needs when transporting large components. After the transportation is completed, it automatically returns to the national standard size, thereby reducing transportation costs and lowering costs. The automatic system can be applied to large components of different sizes, providing greater flexibility and adaptability, and can make more efficient use of transportation capacity, increasing transportation efficiency and thus reducing energy consumption and carbon emissions. The utility model has obvious advantages compared with the traditional transportation system in terms of improving efficiency, reducing costs, prompting safety, increasing flexibility, and saving energy and protecting the environment. Description of the Drawings

[0010] Figure 1 is the overall axonometric view of the utility model;

[0011] Figure 2 is the overall front view of the utility model;

[0012] Figure 3 is the overall left view of the utility model;

[0013] Figure 4 is the axonometric view of the utility model without a waterproof tarpaulin;

[0014] Figure 5 is the bottom view of the utility model without a waterproof tarpaulin;

[0015] Figure 6 is the utility model without a waterproof tarpaulin;

[0016] Figure 7 is the axonometric view of the box body of the utility model;

[0017] Figure 8 is the front view of the box body of the utility model;

[0018] Figure 9 is the side view of the box body of the utility model;

[0019] Figure 10 is the axonometric view of the driving mechanism of the utility model;

[0020] Figure 11 is the front view of the driving mechanism of the utility model;

[0021] Figure 12 is the side view of the driving mechanism of the utility model;

[0022] Figure 13 Is the axonometric drawing of the guiding mechanism of the present utility model;

[0023] Figure 14 Is the front view of the guiding mechanism of the present utility model;

[0024] Figure 15 Is the side view of the guiding mechanism of the present utility model;

[0025] Figure 16 Is the axonometric drawing of the electric control mechanism of the present utility model;

[0026] Figure 17 Is the front view of the electric control mechanism of the present utility model;

[0027] Figure 18 Is the side view of the electric control mechanism of the present utility model;

[0028] Figure 19 Is the axonometric drawing of the lifting mechanism of the present utility model;

[0029] Figure 20 Is the structural schematic diagram of the fully openable side box door mechanism of the present utility model;

[0030] Figure 21 Is the axonometric drawing of the product supporting and fixing mechanism of the present utility model;

[0031] Wherein: 1. Box body; 2. Driving mechanism; 3. Guiding mechanism; 4. Electric control mechanism; 5. Lifting mechanism; 6. Product supporting and fixing mechanism; 7. Fully openable side box door mechanism; 8. Waterproof tarpaulin; 101. Fixed main box; 102. Sliding side box; 301. Slide rail; 302. Pulley seat; 303. Pulley; 304. Support platform; 501. Hoisting hole; 601. Clamping plate; 602. Clamping plate support bracket; 603. Support seat; 701. Side door; 702. Hinge; 703. Door latch type quick clamp. Specific embodiments

[0032] In order to better understand the purpose, structure and function of the present utility model, the following further detailed description of the present utility model will be made in conjunction with the attached drawings.

[0033] As Figures 1 to 21As shown in the figure, the utility model provides an automatic container transfer rack for road transportation of large aircraft components, which includes a box body 1, an electric control mechanism 4, a waterproof tarpaulin 8, a plurality of driving mechanisms 2, a plurality of guiding mechanisms 3, a plurality of lifting mechanisms 5 and a plurality of product supporting and fixing mechanisms 6; the box body 1 includes a fixed main box 101 and two sliding side boxes 102 arranged on the left and right sides of the fixed main box 101. The two sliding side boxes 102 are respectively slidably connected to the fixed main box 101 through a plurality of guiding mechanisms 3. The two sliding side boxes 102 are both driven by a plurality of driving mechanisms 2 to reciprocate in the left and right directions. A plurality of lifting mechanisms 5 are installed on the outer edge of the box body 1, and a plurality of product supporting and fixing mechanisms 6 are installed inside the box body 1 for loading products. A waterproof tarpaulin 8 is covered outside the box body 1, and a plurality of driving mechanisms 2 are controlled by the electric control mechanism 4.

[0034] As Figures 7 to 9 shown, both the fixed main box 101 and the two sliding side boxes 102 adopt a concave structure. The lengths and heights of the fixed main box 101 and the two sliding side boxes 102 decrease in sequence. And the two sliding side boxes 102 are arranged above the fixed main box 101 in ascending order, so that the two sliding side boxes 102 can be stacked on top of each other under the action of the driving mechanism 2. The bottoms of the fixed main box 101 and the two sliding side boxes 102 are both composed of a plurality of plate modules. By changing the number of plate modules, the lengths of the fixed main box 101 and the two sliding side boxes 102 can be changed. Full-open side box door mechanisms 7 are installed on the outer sides of the two sliding side boxes 102.

[0035] The box body 1 is the main structure for accommodating and protecting products. Due to the excessive length of the box body 1, the box body 1 is divided into six parts. The middle main box body is the fixed main box 101, and the left and right ends are designed as sliding side boxes 102. The box body 1 is a welded structure, welded by plates and square steel. The sliding side box 102 slides on the fixed main box 101 through an electric telescopic cylinder, and the box body 1 can be retracted to a width that meets the standard.

[0036] When the locking of the electric telescopic cylinder fails or to avoid the failure of the locking of the electric telescopic cylinder, after the two sliding side boxes 102 are adjusted by sliding, mechanical locking can be carried out through the cooperation of L-shaped mechanical locking parts 9 and bolts between the two ends of the two sliding side boxes 102 and the fixed main box 101.

[0037] The L-shaped mechanical locking part 9 can adopt existing components.

[0038] As Figure 5 、 Figures 10 to 12As shown in the figure, each of the driving mechanisms 2 is an electric telescopic cylinder driven by a servo motor. The cylinder bodies of multiple driving mechanisms 2 are all fixed on the bottom surface of the fixed main box 101. Multiple driving mechanisms 2 are all arranged in the left - right direction, and are divided into two groups. The telescopic parts of the two groups of driving mechanisms 2 are respectively connected to the sliding side boxes 102 on the left and right sides.

[0039] The driving mechanism 2 provides power to drive the guiding mechanism 3 to perform size change.

[0040] The driving mechanism 2 drives the servo motor through the electric control cabinet of the electric control mechanism 4 to drive the electric telescopic cylinder to perform linear motion, thereby driving the sliding side boxes 102 on the left and right to move to the theoretical position. The synchronous expansion and contraction of 12 electric telescopic cylinders are realized through motor program control. The expansion and contraction length of the electric telescopic cylinder is 1.8M. The main advantage of choosing the electric telescopic cylinder is that it is suitable for various accessories with different power and service life requirements and has high flexibility.

[0041] As Figure 6 、 Figures 13 to 15 shown, each of the guiding mechanisms 3 includes a slide rail 301, multiple pulleys 303 and multiple pulley seats 302; multiple left - right direction grooves are opened on the bottom surface of each sliding side box 102, a slide rail 301 is installed in each groove, each slide rail 301 is rotatably connected to multiple pulleys 303 below, each pulley 303 is rotatably installed on its respective pulley seat 302, and the axial direction of each pulley 303 is the up - down direction. The pulley seats 302 located below are all installed on the upper surface of the fixed main box 101, the pulley seats 302 located above are all installed on the corresponding support platforms 304, and the sliding side boxes 102 located below are provided with chutes for avoiding the support platforms 304 at the corresponding positions of each support platform 304.

[0042] The guiding mechanism 3 is used to guide and control the size change of the box body 1, and cooperate with the driving mechanism 2 to complete the linear guiding of the sliding of the box body 1. The slide rail 301 of the pulley 303 has good straightness and relatively smooth guiding ability, which can increase the smoothness when the box body 1 contracts or expands and share the weight of the box body 1.

[0043] As Figure 4 、 Figures 16 to 18 shown, the electric control mechanism 4 can adopt existing electrical components and an electric control cabinet, which is responsible for the electronic control and monitoring during the size change process of the box body 1. It consists of the installation of PLC, touch screen, actuating element, proximity switch, indicator light, button, air switch, electric telescopic rod circuit equipment switch, circuit protector, etc. The integrated position frame of the power output interface adopts a square steel welding structure and has a waterproof function.

[0044] As Figure 4 、 Figure 19As shown, the main body of each lifting mechanism 5 is a square box structure, and a lifting hole 501 is provided on the upper surface and one side surface of the lifting mechanism 5.

[0045] The joint of the lifting mechanism 5 for lifting the box body 1 is connected to the transport vehicle and connected to the lifting connector (such as a rope, a hook, etc.) of the transport vehicle. It is made of metal material and its strength is ensured through strength analysis.

[0046] As Figure 21 shown, each product supporting and fixing mechanism 6 includes a clamping plate 601, a clamping plate supporting bracket 602 and a plurality of supporting seats 603. The clamping plate supporting bracket 602 is of a U-shaped structure. The clamping plate 601 is detachably installed on the clamping plate supporting bracket 602 through bolts. The clamping plates 601 of a plurality of product supporting and fixing mechanisms 6 jointly support the product, and the inclination angle of the upper surface of the clamping plate 601 is set according to the shape of the product. The clamping plate supporting brackets 602 of a plurality of product supporting and fixing mechanisms 6 are fixed on the fixed main box 101 or the sliding side box 102 through the supporting seats 603 according to their respective positions.

[0047] The product supporting and fixing mechanism 6 is used to support and fix the product. When the box body 1 is unfolded, the product is lifted into the box body 1 from above, supported by the clamping plate 601, and tightened with a tightening belt. The clamping plates 601 are all detachable clamping plates 601. The gap between two products is protected by EVA foam, which can effectively prevent shock, collision and extrusion, and play a role in moisture-proof and water-absorption prevention. The EVA foam can be engraved and cut according to the shape, and the material has good toughness. The fitting surface between the clamping plate 601 and the product is protected by rubber. The product is fully wrapped with a buffer material to prevent damage caused by collision and dropping during transportation; an additional protective layer is provided for the easily damaged parts. The packaging materials used need to ensure rain-proof, moisture-proof, corrosion-proof treatment to avoid the influence of corrosive substances on the product. In addition, the packaging materials should ensure that dust and sundries are prevented from entering the product.

[0048] As Figure 4 、 Figure 20 shown, the fully openable side box door mechanism 7 is used to ensure the openness on both sides of the box body 1.

[0049] Each fully openable side box door mechanism 7 includes a plurality of side doors 701, a plurality of hinges 702 and a plurality of latch-type quick clamps 703; the plurality of side doors 701 are arranged in sequence along the corresponding sliding side box 102. The plurality of side doors 701 are fixedly connected and rotatably connected to the sliding side box 102 in a crosswise manner in sequence, and when rotatably connected to the sliding side box 102, hinges 702 are used. When rotating, the side door 701 is connected to the adjacent fixed side door 701 through the latch-type quick clamp 703.

[0050] As Figures 1 to 3As shown, the waterproof tarpaulin 8 is used for the overall waterproof function of the box body 1. Since the waterproof tarpaulin 8 has good toughness, strength and excellent waterproof performance, the top of the box body 1 is protected by the waterproof tarpaulin 8, and its main material is polyethylene plastic with a polyurethane coating.

[0051] Materials: The material of the box body 1 is metal Q235 - A.F; the material of the lifting mechanism 5 is metal Q235 - A.F; the material of the product support and fixing mechanism 6 is metal 6061; the material of the fully open side box door mechanism 7 is metal Q235 - A.F.

[0052] These components work together to enable the large - aircraft - component road - transportation automated container transfer rack to automatically adjust its size when needed, thus adapting to products of different sizes and transportation requirements. This design is innovative and practical, and can effectively solve the challenges in transporting over - sized products.

[0053] The utility model has the following characteristics:

[0054] 1. Automated size - adjustment mechanism;

[0055] Develop and implement a mechanism for automatically adjusting the size of the box body 1, including an electric telescopic cylinder system and a guiding mechanism, which can effectively control and adjust the size of the box body 1.

[0056] 2. Structural design and stability;

[0057] Design and optimize the structure of the box body 1 to ensure that it can reach the required size in the unfolded state, and at the same time ensure sufficient strength and stability to carry large - sized products and be safely transported on the road.

[0058] 3. Electric control system and sensing technology;

[0059] Integrate an electronic control system for monitoring and regulating the process of size change of the box body 1. Sensor technology is also involved to provide real - time feedback on the size and position information of the box body.

[0060] 4. Material selection and lightweight design;

[0061] It is necessary to select appropriate materials that can provide sufficient strength and durability, and at the same time achieve lightweight design as much as possible to reduce the overall weight and improve transportation efficiency.

[0062] 5. Safety and operability considerations;

[0063] Take into account the factors of safety and operability in the design to ensure that the size - adjustment process of the box body 1 is safe and controllable, and can meet the regulatory requirements and operation standards of road transportation.

[0064] Implementation process:

[0065] 1. Design and tooling planning. First, conduct detailed design work. The deformation process of the box 1 can be simulated through a digital model to ensure that it will not interfere with the product and cause damage to the fixed product, and ensure that the design can meet the requirements for transporting oversized components. At the same time, consider its safety, stability, and operational convenience.

[0066] 2. Material selection and manufacturing. Select high-strength steel and lightweight composite materials according to the functionality of the box 1 to ensure that the box 1 can still maintain sufficient structural strength and stability when bearing the size and deformation of large components. Ensure the external dimensions of the precision parts of the box 1 through numerical control machining, and improve the welding performance of the box 1 through welding technology to ensure its strength.

[0067] 3. To ensure safety during use, all steps must be operated in accordance with the requirements of the user manual, and illegal operations are strictly prohibited.

[0068] 4. Check the status of the equipment and each part of the box 1, and operate the electric control mechanism 4 (electrical components and electric control cabinet) to command the drive mechanism 2 (equipment such as electric telescopic cylinders) to work.

[0069] 5. Under the guidance of the guiding mechanism 3, the drive mechanism 2 changes the size of the box 1 (material: metal Q235-A.F).

[0070] 6. After the size change is completed, open the fully openable side box door mechanism 7 (material: metal Q235-A.F).

[0071] 7. Manually install the product support and fixing mechanism 6 (material: metal 6061).

[0072] 8. Lift the product into the box 1 and install soft protection.

[0073] 9. Close the fully openable side box door mechanism 7.

[0074] 10. Lift the entire box 1 through the lifting mechanism 5 (material: metal Q235-A.F) and connect it to the transport vehicle.

[0075] 11. Install the waterproof tarpaulin 8.

[0076] 12. Check all parts. After ensuring there are no errors, start transportation.

[0077] 13. Through the planned route, it is escorted by a professional support team. During the journey, the product status needs to be checked regularly to ensure the product status during transportation.

[0078] 14. After arriving at the destination, lift the box 1 through the lifting mechanism 5 (material: metal Q235-A.F) to disconnect it from the transport vehicle.

[0079] 15. Open the fully open side box door mechanism 7 (material: metal Q235-A.F) and inspect the product.

[0080] 16. Manually disassemble the product support and fixation mechanism 6 (material: metal 6061).

[0081] 17. Lift the product out of the box body 1.

[0082] 18. Control the electric control mechanism 4 to command the drive mechanism 2 to work and contract the box body 1. The process of completing the transportation work is as follows:

[0083] 1. Expand the box body 1 through electric control. After expansion, connect the fastening bolts and the fixator.

[0084] 2. Install the card board 601 adapted to the product and the tightening belt.

[0085] 3. Lift the product and place it into the box body 1 (position and lock the product).

[0086] 4. Install the soft protection for the product.

[0087] 5. Close the side door of the box body 1.

[0088] 6. Install the waterproof tarpaulin 8.

[0089] 7. Lift and place it on the transport vehicle (connect the box body 1 and the transport vehicle).

[0090] 8. Transport according to the planned route (must comply with laws and regulations).

[0091] 9. After arriving at the destination, open the waterproof tarpaulin 8.

[0092] 10. Open the side door 701.

[0093] 11. Manually disassemble the soft product protection.

[0094] 12. Lift the product out of the box body 1.

[0095] 13. Manually disassemble the card board 601.

[0096] 14. Contract the box body 1 through electric control.

[0097] 15. Inspect the status of the box body 1.

[0098] 16. Transport back to the starting point to complete the closed loop.

[0099] It can be understood that the present utility model is described by way of some embodiments. Those skilled in the art will be aware that, without departing from the spirit and scope of the present utility model, various changes or equivalent substitutions can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the present utility model.

Claims

1. An automated container transfer rack for highway transportation of large aircraft parts, characterized by: The invention comprises a box (1), an electric control mechanism (4), a waterproof tarpaulin (8), a plurality of driving mechanisms (2), a plurality of guiding mechanisms (3), a plurality of lifting mechanisms (5) and a plurality of product supporting and fixing mechanisms (6); the box (1) comprises a fixed main box (101) and two sliding side boxes (102) arranged on the left and right sides of the fixed main box (101); the two sliding side boxes (102) are respectively connected to the fixed main box (101) by sliding through a plurality of guiding mechanisms (3); the two sliding side boxes (102) are driven by a plurality of driving mechanisms (2) to reciprocate in the left and right directions; a plurality of lifting mechanisms (5) are installed on the outer edge of the box (1); a plurality of product supporting and fixing mechanisms (6) are installed inside the box (1) for loading products; a waterproof tarpaulin (8) is provided on the outer side of the box (1); and the plurality of driving mechanisms (2) are controlled by the electric control mechanism (4).

2. The large aircraft parts road transport automated container transfer rack according to claim 1, characterized in that: The fixed main box (101) and the two sliding side boxes (102) both adopt a concave structure. The lengths and heights of the fixed main box (101) and the two sliding side boxes (102) are successively reduced, and the two sliding side boxes (102) are sequentially arranged above the fixed main box (101) from small to large, so that the two sliding side boxes (102) can be stacked up and down under the action of the driving mechanism (2). The bottoms of the fixed main box (101) and the two sliding side boxes (102) are both composed of a plurality of plate modules. By changing the number of plate modules, the lengths of the fixed main box (101) and the two sliding side boxes (102) can be changed. The outer sides of the two sliding side boxes (102) are both installed with fully open side box door mechanisms (7).

3. The large aircraft parts road transport automated container transfer rack according to claim 2, characterized in that: Each of the drive mechanisms (2) uses an electric telescopic cylinder driven by a servo motor, the cylinder bodies of the multiple drive mechanisms (2) are fixed on the bottom surface of the fixed main box (101), the multiple drive mechanisms (2) are arranged in the left and right directions, and the multiple drive mechanisms (2) are divided into two groups, and the telescopic parts of the two groups of drive mechanisms (2) are respectively connected to the sliding side boxes (102) on the left and right sides.

4. The large aircraft parts road transport automated container transfer rack according to claim 2, characterized in that: Each of the guide mechanisms (3) comprises a slide rail (301), a plurality of pulleys (303) and a plurality of pulley seats (302); a plurality of grooves in the left and right directions are provided on the bottom surface of each of the sliding side boxes (102), a slide rail (301) is installed in each groove, each of the slide rails (301) is rotatably connected to a plurality of pulleys (303) below, each of the pulleys (303) is rotatably installed on its own pulley seat (302), and the axial direction of each pulley (303) is in the up-down direction, the pulley seats (302) located below are installed on the upper surface of the fixed main box (101), the pulley seats (302) located above are installed on the corresponding support platforms (304), and the sliding side boxes (102) located below are provided with slide grooves for avoiding the support platforms (304) at the corresponding positions of each support platform (304).

5. The large aircraft parts road transport automated container transfer rack according to claim 1, characterized in that: The main body of each lifting mechanism (5) is a square box structure, and a lifting hole (501) is provided on the upper surface and one of the side surfaces of the lifting mechanism (5).

6. The large aircraft parts road transport automated container transfer rack according to claim 2, characterized in that: Each of the product supporting and fixing mechanisms (6) comprises a cardboard (601), a cardboard supporting bracket (602) and a plurality of supporting seats (603); the cardboard supporting bracket (602) is a U-shaped structure; the cardboard (601) is detachably mounted on the cardboard supporting bracket (602) by means of bolts; the cardboards (601) of the plurality of product supporting and fixing mechanisms (6) jointly support the product, and the inclination angle of the upper surface of the cardboard (601) is set according to the shape of the product; the cardboard supporting brackets (602) of the plurality of product supporting and fixing mechanisms (6) are fixed on the fixed main box (101) or the sliding side box (102) by means of the supporting seats (603) according to their respective positions.

7. The large aircraft parts road transport automated container transfer rack according to claim 2, characterized in that: Each of the fully open side box door mechanisms (7) comprises a plurality of side doors (701), a plurality of hinges (702) and a plurality of latch-type quick clamps (703); the plurality of side doors (701) are sequentially arranged along the corresponding sliding side box (102); the plurality of side doors (701) are sequentially cross-fixedly connected and rotatably connected to the sliding side box (102); the hinges (702) are used when the side doors (701) are rotatably connected to the sliding side box (102); and the side doors (701) are connected to the adjacent fixed side doors (701) via the latch-type quick clamps (703) when the side doors (701) are rotatably connected.

Images