Aluminum alloy step for scaffold

Abstract

The application discloses an aluminum alloy footboard for a scaffold, relates to the technical field of the scaffold, and comprises a frame made of aluminum alloy and a plurality of horizontal rods made of aluminum alloy. The two ends of the horizontal rods are connected with the inner front and rear side walls of the frame. Two C-shaped clamping bases are fixed to the rear side wall of the frame. Two receiving grooves are formed in the front side wall of the frame. Limiting parts are arranged in the receiving grooves. The limiting parts are matched with the C-shaped clamping bases and are arranged on the two side beams of the scaffold. The side view cross section of the horizontal rod is in the shape of an isosceles trapezoid with a large upper end and a small lower end. A material blocking part is arranged at the bottom end of the horizontal rod to prevent material from falling from the gap between two adjacent horizontal rods. The horizontal rods with the large upper end and the small lower end are welded with the frame, the footboard frame is arranged on the assembled scaffold, the construction requirements of the constructors are met, and the granular soil, small-size screws and other small-size parts can be prevented from falling to form high-altitude falling objects, thereby avoiding the serious safety hazards.

Description

Technical Field

[0001] This invention relates to the field of scaffolding technology, specifically to an aluminum alloy scaffolding platform. Background Technology

[0002] Scaffolding, with its high load-bearing capacity, convenient assembly and disassembly, and ease of erection, is widely used in construction. Scaffolding consists of supports and planks. Existing supports are constructed by splicing steel pipes and interlocking buckles, while planks are made of steel plates with side ribs, welded to several horizontal bars and wire mesh to form support components. Buckles are welded to both ends of the support frame, securing it to the horizontal bars of the support to allow workers to work at height. However, the current technology, using wire mesh welded to steel plates and horizontal bars to form planks, while meeting support requirements, allows for the easy fall of soil, small screws, and other small parts through the perforated holes, posing a serious safety hazard. Therefore, this paper designs an aluminum alloy plank for scaffolding to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide an aluminum alloy scaffolding platform to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an aluminum alloy scaffolding platform, comprising an aluminum alloy frame and several aluminum alloy crossbars, the crossbars being evenly spaced, with both ends of the crossbars connected to the inner front and rear side walls of the frame. The frame and the crossbars are made of aluminum alloy, which has high rigidity. The crossbars are welded to the inner side walls of the frame to form a platform, which can meet the weight requirements of construction workers.

[0005] Two C-shaped brackets are fixed to the rear side wall of the frame, and two storage slots are opened on the front side wall of the frame. The two storage slots are respectively distributed opposite the two C-shaped brackets. Limiting components are provided in the storage slots. When setting up the stepping board, first place the two C-shaped brackets of the frame on the upper end of the crossbeam of the scaffold, and then lower the C-shaped brackets to lock them onto the crossbeam of the scaffold.

[0006] Two limiting components can extend from two storage slots respectively. Then, the limiting components, together with the C-shaped brackets, are erected on the crossbeams on both sides of the scaffold, thereby setting up the treadmill on the scaffold and allowing construction workers to climb to heights for construction work.

[0007] The cross-section of the crossbar is an isosceles trapezoidal structure with a larger upper end and a smaller lower end. The bottom end of the crossbar is provided with a material-blocking component to prevent material from falling through the gap between two adjacent crossbars. By setting the material-blocking component, it is possible to prevent falling particles of soil, small screws and other small parts from falling through the gap between two adjacent crossbars and forming falling objects from a height, which poses a relatively serious safety hazard.

[0008] In a further embodiment, the gap between two adjacent crossbars does not exceed 5 cm.

[0009] In a further embodiment, the material blocking component includes several baffles, and several connecting blocks are fixed to the upper surface of the baffles. The baffles are fixedly connected to the bottom surface of the crossbars through the connecting blocks. There is a crossbar between two adjacent baffles, and the ends of the two adjacent baffles that are close to each other extend to the same level as the side walls of the crossbars. When granular soil, small screws, and other small parts fall through the gap between two adjacent crossbars, they will fall onto the upper surface of the baffles. Since the ends of the two adjacent baffles that are close to each other extend to the same level as the side walls of the crossbars, the vertically falling granular soil, small screws, and other small parts will not fall directly through the gap between the two adjacent baffles, thus reducing safety hazards.

[0010] In a further embodiment, the material blocking component includes several receiving boxes. The receiving box has a semi-circular cross-section when viewed from the side. Several hanging rods are fixed to the upper surface of the receiving box and are fixedly connected to the bottom surface of the crossbar through the hanging rods. There is a crossbar between two adjacent receiving boxes. Guide plates are fixed to the side walls of the crossbar between two adjacent receiving boxes and the left and right side walls inside the frame. The guide plates extend obliquely to the position above the edge of the receiving box. Particles of soil, small screws and other small parts that fall from the gap between two adjacent crossbars will fall onto the guide plates at the corresponding positions, and then slide down along the obliquely distributed guide plates into the corresponding receiving boxes. This achieves the collection function on the one hand, and avoids falling objects from heights and causing safety accidents on the other hand.

[0011] In a further embodiment, two receiving boxes are provided, each fixed to the left and right side walls inside the frame by fixing blocks. Two guide plates are provided, with lifting blocks vertically fixed to the left and right sides of the bottom end of a crossbar located in the middle position. The two guide plates are fixed to the bottom end of the side wall on the side where the two lifting blocks are far apart from each other. The two guide plates extend obliquely to the upper edge of the two receiving boxes. Here, several guide plates are replaced by two, and they are symmetrically distributed with the crossbar in the middle position as the center. No matter if granular soil, small screws, or other small parts fall from the gap between any two adjacent crossbars, they will fall on the corresponding guide plate and slide down along the obliquely distributed guide plates into the receiving box. This can also achieve the collection function and avoid falling objects from heights, which could cause safety accidents.

[0012] In a further embodiment, several connecting rods are fixed on the upper surface of both guide plates, and each connecting rod is fixedly connected to the bottom end of the crossbar located directly above the connecting rod.

[0013] In a further embodiment, the limiting component includes a support plate, with two support plates located in two storage slots respectively. The upper and lower sides of the two support plates at their opposite ends are rotatably connected to the upper and lower side walls inside the corresponding storage slots via pins. By rotating the two support plates out of the storage slots with their respective pins as the rotation center, they are distributed parallel to the crossbar and fall onto the crossbeam of the scaffold, thus suspending the treadmill in the air.

[0014] In a further embodiment, a T-shaped stop bar is slidably inserted into the end of the bearing plate away from the pin through a plug hole. Two notches are opened on the front side of the upper end of the frame, which are respectively connected to two storage slots. The stop bar can rotate out of the storage slot with the bearing plate. When the bearing plate is completely rotated out of the storage slot, the stop bar is positioned on the outer side above the crossbeam of the scaffold. The stop bar slides down along the plug hole and is positioned on the outer side of the crossbeam of the scaffold, preventing the bearing plate from rotating arbitrarily around the pin, which would cause one end of the entire tread to detach from the crossbeam of the scaffold and easily cause a safety accident of construction workers falling from a height. The bearing plate flips around the pin into the storage slot and the stop bar is stuck in the notch.

[0015] In a further embodiment, a limiting block is fixed at the bottom end of the stop bar, and an opening for receiving the limiting block is provided at the bottom end of the bearing plate away from the pin. First, the stop bar is rotated in the insertion hole to rotate the limiting block out of the opening. Then, after the bearing plate is completely rotated out of the receiving groove, the stop bar is positioned above the outer side of the scaffold beam. Then, the stop bar slides down along the insertion hole. When the limiting block is positioned below the outer side of the scaffold beam, the stop bar is rotated in the opposite direction to rotate the limiting block directly below the scaffold beam. The upper end face of the limiting block has a downwardly concave arc structure. A spring is sleeved on the outer wall of the stop bar located on the upper end face of the bearing plate. Using the elastic potential energy of the spring, the stop bar slides upward along the insertion hole, which can make the downwardly concave arc structure of the limiting block fit against the bottom side wall of the scaffold beam. This prevents the stop bar and the limiting block from rotating arbitrarily, affecting the limiting position of the stop bar and the limiting block on the scaffold beam.

[0016] In a further embodiment, guide grooves are provided on both the upper and lower side walls inside the storage slot. The guide grooves are slidably engaged with the pins of the support plate. The guide grooves extend obliquely from the end of the storage slot away from the opening to the end closer to the opening. By sliding the pins along the guide grooves, the position of the support plate relative to the frame can be slightly adjusted to the side away from the frame. This allows the stop bar to be placed on the outside of the scaffold beam, facilitating its rapid sliding down along the insertion hole and connecting to the rotation of the limiting block. This avoids sliding friction resistance between the support plate and the beam, which would affect the rapid restriction of the support plate's position.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention relates to an aluminum alloy scaffolding platform. It changes the traditional method of using wire mesh welded to steel plates and crossbars to form the platform. Instead, it uses several isosceles trapezoidal crossbars, wider at the top and narrower at the bottom, welded to a frame to form the platform. This platform is then placed on the assembled scaffolding, meeting the needs of construction workers while preventing the falling of soil, small screws, and other small components, which could pose a serious safety hazard. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 Enlarged view of the structure at point A in the middle;

[0021] Figure 3 This is a schematic diagram of the stop bar and limiting block structure of the present invention;

[0022] Figure 4 This is a partial structural diagram of the frame of the present invention;

[0023] Figure 5 This is a partial cross-sectional view of the frame and supporting components of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0026] Figure 8 For the present invention Figure 7 Enlarged view of the structure at point B in the middle.

[0027] In the diagram: 1. Frame; 11. Storage slot; 12. Guide slot; 2. Crossbar; 3. C-shaped bracket; 4. Bearing plate; 41. Stop bar; 42. Spring; 43. Limiting block; 5. Baffle; 51. Connecting block; 52. Connecting rod; 53. Guide plate; 54. Hanging rod; 55. Material receiving box; 56. Lifting block. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] Please see Figure 1 , Figure 2 , Figure 3 and Figure 5 This embodiment provides an aluminum alloy scaffolding platform, including an aluminum alloy frame 1 and several aluminum alloy crossbars 2. The two ends of the crossbars 2 are connected to the front and rear side walls of the inner side of the frame 1. The frame 1 and the several crossbars 2 are made of aluminum alloy, which has strong hardness. The crossbars 2 are welded to the inner side wall of the frame 1 to form a platform, which can meet the weight requirements of construction workers.

[0031] Two C-shaped brackets 3 are fixed to the rear side wall of frame 1, and two storage slots 11 are opened on the front side wall of frame 1. The two storage slots 11 are respectively distributed opposite to the two C-shaped brackets 3. Limiting components are provided in the storage slots 11. When setting up the platform, first place the two C-shaped brackets 3 of frame 1 on the upper end of the crossbeam of the scaffold, and then lower the C-shaped brackets 3 to lock them onto the crossbeam of the scaffold.

[0032] Two limiting components can extend from the two storage slots 11 respectively. Then, the limiting components, together with the C-shaped brackets 3, are erected on the crossbeams on both sides of the scaffold, thereby setting up the treadmill on the scaffold and allowing construction workers to climb to heights for construction work.

[0033] The limiting component includes a bearing plate 4. The two bearing plates 4 are located in the two storage slots 11 respectively. The upper and lower sides of the two bearing plates 4 at the opposite ends are rotatably connected to the upper and lower side walls of the corresponding storage slots 11 through pins. The two bearing plates 4 are rotated out of the storage slots 11 with their respective corresponding pins as the rotation center, and are distributed parallel to the crossbar 2 and placed on the crossbeam of the scaffold, so that the treadmill can be erected in the air.

[0034] The end of the bearing plate 4 furthest from the pin is slidably connected to a T-shaped stop bar 41 through a plug hole. Two notches are opened on the front side of the upper end of the frame 1, which are respectively connected to two storage slots 11. The stop bar 41 can rotate out of the storage slots 11 along with the bearing plate 4. When the bearing plate 4 is completely rotated out of the storage slots 11, the stop bar 41 is positioned on the outer side above the crossbeam of the scaffold. The stop bar 41 slides down along the plug hole and is positioned on the outer side of the crossbeam of the scaffold, preventing the bearing plate 4 from rotating arbitrarily around the pin, which would cause one end of the entire tread to detach from the crossbeam of the scaffold and easily cause a safety accident of construction workers falling from a height.

[0035] The support plate 4 is flipped around the pin and placed into the storage groove 11, and the stop bar 41 is locked in the notch. The notch facilitates the storage of the stop bar 41. In addition, the stop bar 41 facilitates the rotation of the support plate 4.

[0036] In addition, if only the stop bar 41 is used as a limiting component for the free rotation of the bearing plate 4, the stop bar 41 may come off the insertion hole as it is pulled up and down along the insertion hole. This would cause the bearing plate 4 to rotate and come off the crossbeam of the scaffold, causing a safety accident. Therefore, a limiting block 43 is fixed at the bottom of the stop bar 41. An opening for receiving the limiting block 43 is opened at the bottom of the bearing plate 4 away from the pin. First, the stop bar 41 is rotated in the insertion hole to rotate the limiting block 43 out of the opening. Then, after the bearing plate 4 is completely rotated out of the receiving groove 11, the stop bar 41 is placed on the outer side above the crossbeam of the scaffold. Then, the stop bar 41 is slid down along the insertion hole. When the limiting block 43 is placed below the outer side of the crossbeam of the scaffold, the stop bar 41 is rotated in the opposite direction to rotate the limiting block 43 to directly below the crossbeam of the scaffold.

[0037] A spring 42 is sleeved on the outer wall of the stop bar 41 and located on the upper end face of the bearing plate 4. The upper end face of the limiting block 43 is provided with a downwardly recessed arc structure. By utilizing the elastic potential energy of the spring 42, the stop bar 41 slides upward along the insertion hole, which can make the downwardly recessed arc structure of the limiting block 43 fit against the bottom side wall of the scaffold beam. This prevents the stop bar 41 and the limiting block 43 from rotating arbitrarily, which would affect the limiting of the scaffold beam by the stop bar 41 and the limiting block 43.

[0038] Several horizontal bars 2 are evenly spaced and mainly serve as support for construction workers. The gap between two adjacent horizontal bars 2 does not exceed 5cm. By setting a 5cm gap, on the one hand, the number of horizontal bars 2 is reduced, thus reducing the weight of the overall structure. On the other hand, while meeting the support requirements, it also prevents construction workers' shoes from getting stuck in the 5cm gap, which could lead to accidental ankle sprains.

[0039] In addition, the cross section of the crossbar 2 is an isosceles trapezoidal structure with a larger upper end and a smaller lower end. The larger upper end of the crossbar 2 expands the support surface and enhances the stability of the construction workers. In addition, the smaller lower end of the crossbar 2 can save on the material expenditure of the crossbar 2, thereby reducing the cost.

[0040] Instead of using wire mesh welded together with steel plates and crossbars 2 to form the treads, several isosceles trapezoidal crossbars 2 with larger upper ends and smaller lower ends are set up and welded together with the frame 1 to form the treads. The treads are then mounted on the assembled scaffolding using C-shaped brackets 3 and limiting components, which meets the construction needs of the workers and also makes it easy to disassemble the treads.

[0041] The bottom end of the crossbar 2 is equipped with a material blocking component to prevent material from falling through the gap between two adjacent crossbars 2. By setting the material blocking component, it is possible to prevent falling particles of soil, small screws and other small parts from falling through the gap between two adjacent crossbars 2, forming falling objects from a height, which poses a serious safety hazard.

[0042] The material blocking component includes several baffles 5. Several connecting blocks 51 are fixed to the upper surface of the baffles 5, and are fixedly connected to the bottom surface of the crossbar 2 through the connecting blocks 51. There is a crossbar 2 between two adjacent baffles 5, and the ends of the two adjacent baffles 5 that are close to each other extend to the level of the side walls of the crossbar 2. When granular soil, small screws and other small parts fall through the gap between the two adjacent crossbars 2, they will fall on the upper surface of the baffles 5. Since the ends of the two adjacent baffles 5 that are close to each other extend to the level of the side walls of the crossbar 2, the vertically falling granular soil, small screws and other small parts will not fall directly through the gap between the two adjacent baffles 5, reducing safety hazards.

[0043] Similarly, when removing the pedal, tilting it allows granular soil, small screws, and other small parts to slide off along the tilted baffle 5, achieving a quick cleaning.

[0044] Example 2

[0045] Please see Figure 1 and Figure 6 The difference from Example 1 is that:

[0046] The material blocking component includes several receiving boxes 55. The receiving box 55 has a semi-circular cross-section when viewed from the side. Several hanging rods 54 are fixed on the upper surface of the receiving box 55 and are fixedly connected to the bottom surface of the crossbar 2 through the hanging rods 54. The receiving box 55 is hoisted below the crossbar 2 by the hanging rods 54 to receive granular soil, small screws and other small parts falling from the gap between two adjacent crossbars 2.

[0047] A crossbar 2 is spaced between two adjacent receiving boxes 55. Guide plates 53 are fixed on both sides of the crossbar 2 between two adjacent receiving boxes 55 and on the left and right sides inside the frame 1. The guide plates 53 extend obliquely to the top of the edge of the receiving box 55. Particles, small screws and other small parts that fall from the gap between two adjacent crossbars 2 will fall onto the guide plates 53 at the corresponding positions, and then slide down the obliquely distributed guide plates 53 into the corresponding receiving box 55. This achieves the collection function on the one hand, and avoids falling objects from heights and causing safety accidents on the other hand.

[0048] Example 3

[0049] Please see Figure 1 , Figure 7 and Figure 8 The difference from Example 2 is that:

[0050] There are two receiving boxes 55, which are fixed to the left and right side walls inside the frame 1 by fixing blocks. There are also two guide plates 53. Lifting blocks 56 are vertically fixed to the left and right sides of the bottom surface of the crossbar 2 in the middle position. The two guide plates 53 are fixed to the bottom of the side wall on the side where the two lifting blocks 56 are far apart. The two guide plates 53 extend obliquely to the top of the edge of the two receiving boxes 55. Here, several guide plates 53 are replaced by two, and they are symmetrically distributed with the crossbar 2 in the middle position as the center. No matter if granular soil, small screws and other small parts fall from the gap between any two adjacent crossbars 2, they will fall on the corresponding guide plate 53 and slide down along the obliquely distributed guide plates 53 into the receiving box 55. This can achieve the collection function and at the same time avoid the occurrence of falling objects from height and causing safety accidents.

[0051] Several connecting rods 52 are fixed on the upper surface of both guide plates 53, and each connecting rod 52 is fixedly connected to the bottom surface of the crossbar 2 located directly above the connecting rod 52. By adding connecting rods 52, the hoisting support strength of the guide plates 53 is enhanced.

[0052] Example 4

[0053] Please see Figure 1 and Figure 4 Further optimizations were made based on Example 1:

[0054] The storage slot 11 has guide slots 12 on both the upper and lower side walls. The guide slots 12 are slidably engaged with the pin of the bearing plate 4. The guide slots 12 extend obliquely from the end of the storage slot 11 away from the opening to the end closer to the opening of the storage slot 11. Since the spacing between the crossbeams of the scaffold and the length of the frame 1 are fixed, when the stop bar 41 on the bearing plate 4 wants to slide down from the outside of the scaffold, it needs to slide against the side wall of the crossbeam of the scaffold, which easily generates sliding resistance. Therefore, after the bearing plate 4 rotates out of the storage slot 11 with the pin as the center, the pin can be slid along the guide slot 12 to slightly adjust the position of the bearing plate 4 relative to the frame 1 to the side away from the frame 1, so that the stop bar 41 can be placed on the outside of the crossbeam of the scaffold, which facilitates the quick sliding down along the insertion hole and the rotation of the connecting limit block 43, avoiding the generation of sliding friction resistance between it and the crossbeam, which would affect the quick restriction of the position of the bearing plate 4.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An aluminum alloy scaffolding platform, comprising an aluminum alloy frame (1) and a plurality of aluminum alloy crossbars (2), characterized in that: Several crossbars (2) are evenly spaced, and the two ends of the crossbars (2) are connected to the front and rear side walls of the frame (1); The rear side wall of the frame (1) is fixed with two C-shaped brackets (3), and the front side wall of the frame (1) has two storage slots (11). The two storage slots (11) are respectively distributed opposite to the two C-shaped brackets (3). The storage slots (11) are provided with limiting components. The limiting components are used in conjunction with the C-shaped brackets (3) and are respectively erected on the crossbeams on both sides of the scaffold. The limiting component includes a support plate (4), with two support plates (4) located in two storage slots (11) respectively. The upper and lower sides of the two support plates (4) that are far apart from each other are rotatably connected to the upper and lower side walls inside the corresponding storage slots (11) through pins. The end of the bearing plate (4) away from the pin is slidably connected to a T-shaped stop bar (41) through a plug hole. The upper end of the frame (1) has two notches on the front side that are respectively connected to two storage slots (11). The bearing plate (4) is flipped around the pin into the storage slot (11) and the stop bar (41) is stuck in the notch. The bottom end of the stop bar (41) is fixed with a limiting block (43). The bottom end of the bearing plate (4) away from the pin is provided with an opening for receiving the limiting block (43). The upper end surface of the limiting block (43) is provided with a downwardly recessed arc structure. The outer wall of the stop bar (41) is sleeved with a spring (42) located on the upper end surface of the bearing plate (4). The cross section of the crossbar (2) is an isosceles trapezoidal structure with a larger upper end and a smaller lower end. The bottom end of the crossbar (2) is provided with a material-blocking component to prevent material from falling through the gap between two adjacent crossbars (2).

2. The aluminum alloy scaffolding platform according to claim 1, characterized in that: The gap between two adjacent horizontal bars (2) shall not exceed 5cm.

3. The aluminum alloy scaffolding platform according to claim 1, characterized in that: The baffle component includes several baffles (5), and several connecting blocks (51) are fixed on the upper end face of the baffles (5), and are fixedly connected to the bottom end face of the crossbar (2) through the connecting blocks (51); There is a horizontal bar (2) between two adjacent baffles (5), and the ends of the two adjacent baffles (5) that are close to each other extend to the same level as the side walls of the horizontal bar (2).

4. The aluminum alloy scaffolding platform according to claim 1, characterized in that: The material blocking component includes several receiving boxes (55). The receiving box (55) has a semi-circular cross-section when viewed from the side. Several hanging rods (54) are fixed on the upper surface of the receiving box (55), and are fixedly connected to the bottom surface of the crossbar (2) through the hanging rods (54). A crossbar (2) is spaced between two adjacent receiving boxes (55). Guide plates (53) are fixed on both sides of the crossbar (2) between two adjacent receiving boxes (55) and on the left and right sides inside the frame (1). The guide plates (53) extend obliquely to the position above the edge of the receiving box (55).

5. The aluminum alloy scaffolding platform according to claim 4, characterized in that: Two receiving boxes (55) are provided. The two receiving boxes (55) are fixed to the left and right side walls inside the frame (1) by fixing blocks. Two guide plates (53) are provided. Lifting blocks (56) are vertically fixed on the left and right sides of the bottom end of a crossbar (2) located in the middle. The two guide plates (53) are fixed at the bottom end of the side wall on the side away from each other. The two guide plates (53) extend obliquely to the position above the edge of the two receiving boxes (55).

6. The aluminum alloy scaffolding platform according to claim 5, characterized in that: Several connecting rods (52) are fixed on the upper surface of both guide plates (53), and each connecting rod (52) is fixedly connected to the bottom surface of the crossbar (2) located directly above the connecting rod (52).

7. The aluminum alloy scaffolding platform according to claim 1, characterized in that: The storage slot (11) has guide slots (12) on both the upper and lower side walls. The guide slots (12) are slidably engaged with the pins of the bearing plate (4). The guide slots (12) extend obliquely from the end of the storage slot (11) away from the opening to the end closer to the opening of the storage slot (11).

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