Adjustable ladder frame direction and form of ladder frame

Abstract

This invention discloses an adjustable ladder scaffold with adjustable direction and shape, relating to the field of ladder scaffolding technology. It includes a support frame, scaffold boards on top of the support frame, and ladders mounted on the support frame. Each ladder includes a first ladder and a second ladder rotatably connected end-to-end. The first ladder is matched to the scaffold boards in length. A guide rail is horizontally mounted on the top of the support frame. The end of the first ladder away from the second ladder is slidably and rotatably connected to the guide rail. As the ladder rotates on the guide rail, it takes on both staircase and platform shapes. In this invention, the top of the ladder slides and switches between the two ends of the guide rail, allowing adjustment of the staircase direction when the ladder is tilted into a staircase shape. This facilitates workers going up and down the scaffold boards without needing to reverse the entire scaffold's direction or reassemble it, making it more convenient. When the first ladder is tilted into a staircase shape, the second ladder compensates for the defect where the first ladder does not touch the ground when tilted into a staircase shape when the scaffold's height exceeds its length.

Description

Technical Field

[0001] This invention relates to the field of ladder scaffolding technology, specifically to a ladder scaffolding with adjustable ladder direction and shape. Background Technology

[0002] Ladder scaffolding consists of support frames, diagonal bracing rods, ladder structures, and footboards. It is used in high-altitude operations such as building construction, equipment maintenance, and exterior wall decoration, and is mainly used to provide working platforms, material storage, and safety protection for construction workers.

[0003] For example, patent CN216196531U discloses an attached scaffolding ladder structure, including a horizontal platform and a tilting ladder mounted on the platform. The platform has a through slot extending vertically and along its length. One end of the tilting ladder is hinged to the inner wall of the through slot. A first hinge block is fixedly connected to the bottom of the tilting ladder, and a second hinge block is fixedly connected to the bottom surface of the platform near the hinge point with the tilting ladder. A drive cylinder is hinged between the first hinge block and the second hinge block. When the ladder is needed, the tilting ladder rotates downwards and lowers one end to the lower platform, facilitating worker ascent within the scaffolding. When the ladder is not in use, the tilting ladder flips upwards, retracting into the through slot and remaining horizontal, allowing normal passage through the platform.

[0004] In existing technologies such as those described in the aforementioned patents, when the scaffolding's tilting ladder is placed at an angle to form a staircase, its staircase direction is a specific direction. During construction, when the scaffolding is installed or moved to the end of the construction site, the staircase direction is blocked by a wall, making it impossible for people to access the stairs. It is necessary to rotate the entire scaffolding to adjust the staircase direction, thus facilitating workers to ascend and descend the scaffold boards via the ladder. However, the scaffolding is quite heavy, and rotating it is laborious. Even in narrow spaces such as corridors, balconies, and connecting corridors, the scaffolding cannot be rotated as a whole due to space constraints. Often, it is necessary to reassemble the scaffolding, or move it away from the end of the narrow construction site, with workers and materials first climbing the stairs to the platform before colleagues push the scaffolding to the end of the construction site, posing a safety hazard. Furthermore, some scaffolding structures are much taller than they are long, and when the ladder (tilting ladder) is placed at an angle to form a staircase, it cannot reach the ground, thus failing to function as a proper staircase. Summary of the Invention

[0005] The purpose of this invention is to provide a ladder-type scaffold with adjustable ladder direction and shape to solve the problems in the prior art where the direction of the ladder (rotating ladder) cannot be adjusted individually when it is in the form of a staircase, which leads to construction inconvenience, and where the ladder does not touch the ground when the height of the scaffold is greater than its length and it is placed at an angle in the form of a staircase.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a ladder-type scaffold with adjustable ladder direction and shape, comprising a support frame, a scaffold board disposed on the top of the support frame, and a ladder frame disposed on the support frame. The ladder frame includes a first ladder frame and a second ladder frame rotatably connected end to end. The first ladder frame and the scaffold board are adapted in length. A guide rail is horizontally mounted on the top of the support frame. The end of the first ladder frame away from the second ladder frame is slidably and rotatably connected to the guide rail. During the rotation of the ladder frame on the guide rail, it has a staircase shape and a platform shape. When the ladder frame is in the staircase shape, the first ladder frame and the second ladder frame are straightened, the ladder frame is inclined and the top is located at either end of the guide rail, and the bottom abuts the ground. The direction of the staircase is adjusted by sliding the top of the ladder frame between the two ends of the horizontal guide rail. When the ladder frame is in the platform shape, the first ladder frame and the second ladder frame are perpendicular to each other, and the first ladder frame is horizontally placed on the guide rail and aligned with the scaffold board.

[0007] Furthermore, the first ladder frame includes a first side rod that is slidably and rotatably connected to the guide rail, a plurality of movable pedals that are rotatably connected to the first side rod in parallel, and a connecting rod that is rotatably connected to each movable pedal. Each movable pedal includes two movable panels that are vertically connected. The first side rod, the connecting rod, and any two adjacent movable pedals form a parallelogram mechanism. The second ladder frame includes a second side rod that is rotatably connected to the first side rod, and a plurality of fixed pedals that are fixedly connected to the second side rod in parallel. Each fixed pedal includes two fixed panels that are vertically connected.

[0008] Furthermore, the first ladder is provided with a locking assembly, which is configured to: lock the first ladder and the second ladder in a straightened state; lock the first ladder horizontally on the guide rail; and lock any movable panel of the movable pedal in a horizontal state.

[0009] Furthermore, the locking assembly includes a sliding sleeve slidably connected to the first side rod and having a limiting groove, a limiting plate fixedly connected to the guide rail, a first limiting block fixedly connected to the first movable step of the adjacent second ladder frame, and a square second limiting block fixedly connected to the second movable step of the adjacent second ladder frame; the sliding sleeve has the following functions during its sliding stroke along the length direction of the first side rod: locking the ladder frame in a first locking position in a staircase shape, the sliding sleeve sleeve is sleeved with the second side rod and engages with the first limiting block through the limiting groove; locking the ladder frame in a second locking position in a platform shape, the sliding sleeve overlaps the limiting plate and engages with the second limiting block through the limiting groove.

[0010] Furthermore, the first side rod is provided with slots for the first locking position and the second locking position corresponding to the sliding sleeve, and a safety pin that can be inserted into the sliding sleeve to engage with the slot is movably inserted.

[0011] Furthermore, the distance between each adjacent movable step is equal to the distance between each adjacent fixed step; when the ladder frame is in the form of a staircase, the distance between each adjacent movable step and the fixed step is equal to the distance between each adjacent movable step.

[0012] Furthermore, the side of the guide rail is provided with a guide groove along its length, and the end of the first side rod away from the second side rod is provided with a cylindrical slide rod that passes through the guide groove.

[0013] Furthermore, when the ladder frame is in the form of a staircase, the angle between the ladder frame and the ground is 45°.

[0014] Furthermore, the length of the second ladder is not greater than the height of the scaffold board, and the sum of the lengths of the first ladder and the second ladder is not less than the height of the scaffold board.

[0015] Compared with the prior art, the present invention provides an adjustable ladder scaffold with adjustable direction and shape. The ladder frame consists of two parts: a first ladder frame and a second ladder frame that are rotatably connected end to end. One end of the first ladder frame slides and rotates with a guide rail. This allows: firstly, the ladder frame to rotate relative to the guide rail, enabling it to be positioned at an angle as a staircase and also to be horizontally positioned as a platform flush with the scaffold board, thus making the ladder frame dual-purpose; secondly, the ladder frame can move relative to the guide rail, with the top of the ladder frame sliding between the two ends of the guide rail, thereby adjusting the angle of the ladder frame. The direction of the stairs when arranged in a staircase shape makes it convenient for workers to go up and down the scaffold boards without having to turn the entire scaffolding or rearrange it, making it more convenient. Thirdly, when the first ladder is placed at an angle in a staircase shape, the second ladder is in a straight state with the bottom of the second ladder touching the ground. This compensates for the defect that the first ladder does not touch the ground when it is placed at an angle in a staircase shape when the height of the scaffolding is greater than its length. Furthermore, when the first ladder is in a platform shape, the second ladder can be folded up relative to the first ladder for storage without obstructing the reserved space for the first ladder to be embedded in the top of the support frame. Attached Figure Description

[0016] To provide a clearer description of the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments will be briefly introduced below.

[0017] Figure 1 A schematic diagram of the overall structure of the ladder frame in the first staircase configuration provided for the embodiment; Figure 2 The overall structural front view of the ladder frame in the first staircase configuration provided in the embodiment; Figure 3 A schematic diagram of a ladder frame structure in the first staircase configuration provided for an embodiment; Figure 4 A partial structural diagram of the sliding sleeve disengaging from the first locking position, provided in the embodiment; Figure 5 A schematic diagram of the structure of the first ladder frame provided in the embodiment; Figure 6 A schematic diagram of the structure of the second ladder frame provided in the embodiment; Figure 7 A schematic diagram of the structure of the movable pedal provided in the embodiment; Figure 8 A schematic diagram of the overall structure of the ladder frame in the first platform configuration provided for the embodiment; Figure 9 The overall structural front view of the ladder frame in the first platform configuration provided in the embodiment; Figure 10 A schematic diagram of a ladder frame structure in the first platform configuration provided for an embodiment; Figure 11 A schematic diagram of the overall structure of the ladder frame in the second staircase configuration provided for the embodiment; Figure 12 The overall structural front view of the ladder frame in the second staircase configuration provided in the embodiment; Figure 13 A schematic diagram of a ladder frame structure in the form of a second staircase provided for an embodiment; Figure 14 A schematic diagram of the overall structure of the ladder frame in the second platform configuration provided for the embodiment; Figure 15 The overall structural front view of the ladder frame in the second platform configuration provided in the embodiment; Figure 16 A schematic diagram of a ladder frame structure in the second platform configuration provided for an embodiment; Figure 17 This is a schematic diagram of the connection structure between the sliding sleeve and the safety pin provided in the embodiment; Figure 18 This is a schematic diagram showing the disassembled structure of the sliding sleeve and the safety pin provided in the embodiment.

[0018] Explanation of reference numerals in the attached figures: 1. Support frame; 2. Scaffold board; 3. Guide rail; 31. Guide groove; 4. First ladder frame; 41. First side bar; 42. Slide bar; 43. Movable tread; 44. Rotary shaft; 45. Connecting rod; 5. Second ladder frame; 51. Second side bar; 52. Fixed tread; 53. Shaft; 6. Locking assembly; 61. Sliding sleeve; 62. Limiting groove; 63. Limiting support plate; 64. First limiting block; 65. Second limiting block; 66. Slot; 67. Safety pin. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Please see Figures 1-18 The present invention provides an adjustable ladder scaffold with adjustable direction and shape, including a support frame 1, a footboard 2, a guide rail 3 and a ladder frame. The footboard 2 is fastened to the top of the support frame 1. There are two guide rails 3, which are fastened to the top of the support frame 1. The top of the support frame 1 is located on one side of the footboard 2 and between the two guide rails 3, which is a reserved space.

[0021] The ladder frame includes a first ladder frame 4 and a second ladder frame 5 connected end-to-end. The first ladder frame 4 is adapted to the length of the scaffold board 2. The end of the first ladder frame 4 away from the second ladder frame 5 is slidably and rotatably connected to the guide rail 3. The length of the second ladder frame 5 does not exceed the height of the scaffold board 2, and the sum of the lengths of the first ladder frame 4 and the second ladder frame 5 is not less than the height of the scaffold board 2. During rotation on the guide rail 3, the ladder frame has both a staircase shape and a platform shape. In the staircase shape, the first ladder frame 4 and the second ladder frame 5 are straightened, the ladder frame is angled with its top located at either end of the guide rail 3, and its bottom abuts the ground. The direction of the staircase is adjusted by sliding the top of the ladder frame between the two ends of the horizontal guide rail 3. In the platform shape, the first ladder frame 4 and the second ladder frame 5 are perpendicular, the first ladder frame 4 is placed horizontally on the guide rail 3 and aligned with the scaffold board 2, and the first ladder frame 4 is embedded in a reserved space. Preferably, when the ladder frame is in the staircase shape, the angle between the ladder frame and the ground is 45°.

[0022] The staircase design is divided into two types based on the direction of the stairs. The first type involves straightening the first ladder frame 4 and the second ladder frame 5, with the ladder frames placed at an angle and their tops located at the first end of the guide rail 3, while the bottoms touch the ground. The stairs face the first direction. The second type involves straightening the first ladder frame 4 and the second ladder frame 5, with the ladder frames placed at an angle and their tops located at the second end of the guide rail 3, while the bottoms touch the ground. The stairs face the second direction. In both types, the directions of the ladder frames are opposite, i.e., the first and second directions are opposite.

[0023] There are two platform configurations: First platform configuration: The first ladder 4 and the second ladder 5 are perpendicular, with the first ladder 4 horizontally positioned on the guide rail 3 and aligned with the scaffold board 2, and the second ladder 5 located at the second end of the guide rail 3. Second platform configuration: The first ladder 4 and the second ladder 5 are perpendicular, with the first ladder 4 horizontally positioned on the guide rail 3 and aligned with the scaffold board 2, and the second ladder 5 located at the first end of the guide rail 3. When the ladder is in the first staircase configuration, simply rotate the first ladder 4 upwards (clockwise) until it is horizontal to switch to the first platform configuration. When the ladder is in the second staircase configuration, simply rotate the first ladder 4 upwards (counter-clockwise) until it is horizontal to switch to the second platform configuration.

[0024] This invention comprises a ladder frame consisting of two parts: a first ladder frame 4 and a second ladder frame 5, which are rotatably connected end-to-end. One end of the first ladder frame 4 slides and rotates with the guide rail 3. This allows for two main benefits: First, the ladder frame can rotate relative to the guide rail 3, enabling it to be positioned at an angle as a staircase and the first ladder frame 4 to be horizontally positioned as a platform flush with the scaffold board 2, thus making the ladder frame dual-purpose. Second, the ladder frame can move relative to the guide rail 3, with its top end sliding between the two ends of the guide rail 3, allowing adjustment of the staircase direction when the ladder frame is positioned at an angle, facilitating work. Workers can easily access the scaffold planks 2 without having to reverse the direction of the entire scaffold or reassemble it; thirdly, when the first ladder 4 is placed at an angle in the form of a staircase, the second ladder 5 is in a straight state with the bottom of the second ladder 5 touching the ground, thus compensating for the defect that the first ladder 4 does not touch the ground when it is placed at an angle in the form of a staircase when the height of the scaffold is greater than its length. Furthermore, when the first ladder 4 is in the form of a platform, the second ladder 5 can be folded and stored relative to the first ladder 4 without obstructing the reserved space at the top of the first ladder 4 for embedding into the support frame 1.

[0025] The first ladder frame 4 includes two parallel and aligned first side rods 41, multiple movable pedals 43, and at least one connecting rod 45. The ends of the two first side rods 41 are slidably and rotatably connected to two guide rails 3, respectively. Specifically, the sides of the guide rails 3 have guide grooves 31 along their length. A cylindrical sliding rod 42 passing through the guide groove 31 is fixedly or rotatably connected to the end of each first side rod 41 away from the second side rod 51. Each movable pedal 43 is rotatably connected between the two first side rods 41 via its own pivot 44, and the movable pedals 43 are equidistantly arranged along the length of the first side rods 41. Each movable pedal 43 includes two vertically connected movable panels, one being a first movable panel and the other a second movable panel. The connecting rod 45 is rotatably connected to the same position of each movable pedal 43, and the axis of rotation between the connecting rod 45 and the movable pedal 43 is parallel (not coincident) to the axis of rotation 44 between the movable pedal 43 and the first side rod 41.

[0026] The first side rod 41, the connecting rod 45, and any two adjacent movable pedals 43 form a parallelogram mechanism. Therefore, the connecting rod 45 can simultaneously drive each movable pedal 43 to rotate relative to the first side rod 41, or in other words, by rotating any movable pedal 43, other movable pedals 43 can be driven to rotate together relative to the first side rod 41.

[0027] The second ladder frame 5 includes two second side rods 51 and multiple fixed pedals 52. The two second side rods 51 are rotatably connected to the ends of the two first side rods 41 away from the guide rail 3 via shafts 53. Each fixed pedal 52 is welded or fixedly connected between the two second side rods 51 by bolts, and the fixed pedals 52 are equidistantly arranged along the length of the second side rods 51. Each fixed pedal 52 includes two vertically connected fixed panels, one of which is a first fixed panel and the other is a second fixed panel.

[0028] The distance between each adjacent movable step 43 is equal to the distance between each adjacent fixed step 52. When the ladder frame is in the staircase form, the distance between adjacent movable step 43 and fixed step 52, the distance between each adjacent movable step 43, and the distance between each adjacent fixed step 52 are all equal.

[0029] The movable treads 43 are configured as two perpendicular movable panels, and the fixed treads 52 are configured as two perpendicular fixed panels. These movable treads 43 are connected by a connecting rod 45, ensuring that: when the ladder frame is in its first staircase configuration, each first movable panel and first fixed panel remains horizontal, functioning as stair treads in the first direction; when the ladder frame switches to its first platform configuration, each first movable panel and first fixed panel remains horizontal, providing horizontal support; when the ladder frame switches to its second staircase configuration, each second movable panel and second fixed panel remains horizontal, functioning as stair treads in the second direction; and when the ladder frame switches to its second platform configuration, each second movable panel and second fixed panel remains horizontal, providing horizontal support. In other words, the construction of the movable treads 43 and fixed treads 52, in conjunction with the connecting rod 45, ensures that regardless of the direction or configuration of the ladder frame, even if the entire ladder frame is rotated 180°, each movable panel and fixed panel can be adjusted to a horizontal state, functioning as stair treads or providing horizontal support.

[0030] The first ladder 4 is provided with a locking component 6, which is configured to: lock the first ladder 4 and the second ladder 5 in a straightened state; lock the first ladder 4 horizontally on the guide rail 3; and lock any movable panel of the movable pedal 43 in a horizontal state.

[0031] Specifically, the locking assembly 6 includes a sliding sleeve 61, a limiting plate 63, a first limiting block 64, and a second limiting block 65. The sliding sleeve 61 is slidably fitted onto the first side rod 41 along its length, and a limiting groove 62 is formed on the inner side of the sliding sleeve 61. The limiting plate 63 is fixedly connected to the bottom of the guide rail 3, with one side protruding into the reserved space inside the guide rail 3. The limiting plate 63 has two sections, distributed near both ends of the guide rail 3. The first limiting block 64 is fixedly connected to the first movable pedal 43 adjacent to the second ladder 5, specifically connected to one end of the movable pedal 43 whose rotating shaft 44 passes through the upper shaft hole of the first side rod 41. The second limiting block 65 is fixedly connected to the second movable pedal 43 adjacent to the second ladder 5, specifically connected to one end of the movable pedal 43 whose rotating shaft 44 passes through the upper shaft hole of the first side rod 41. Both the first limiting block 64 and the second limiting block 65 have square cross-sections, and the side lengths of the two square cross-sections are equal. This side length is adapted to the width of the limiting groove 62. When either the first limiting block 64 or the second limiting block 65 is located within the limiting groove 62, it cannot rotate, thereby preventing the movable pedal 43 from rotating. The diagonal of the square cross-section of the first limiting block 64 is parallel or perpendicular to the movable panel, and the side of the square cross-section of the second limiting block 65 is parallel or perpendicular to the movable panel.

[0032] The sliding sleeve 61 has a first locking position, a second locking position, and an intermediate position during its sliding stroke along the length of the first side rod 41. In the first locking position, the sliding sleeve 61 locks the ladder frame in a staircase configuration. The sliding sleeve 61 is sleeved with the second side rod 51 and engages with the first limiting block 64 via the limiting groove 62. In the second locking position, the sliding sleeve 61 locks the ladder frame in a platform configuration. The sliding sleeve 61 overlaps the limiting support plate 63 and engages with the second limiting block 65 via the limiting groove 62. The intermediate position is located between the first and second locking positions. In this position, the sliding sleeve 61 is neither sleeved with the second side rod 51 nor engages with the first limiting block 64, nor interferes with the limiting support plate 63 nor engages with the second limiting block 65. The second side rod 51 can rotate relative to the first side rod 41, and the movable step 43 can also rotate relative to the first side rod 41.

[0033] A safety pin 67 is also movably inserted into the sliding sleeve 61. Slots 66 are respectively provided on the first side rod 41 at the first and second locking positions of the sliding sleeve 61. When the sliding sleeve 61 is in the first or second locking position, the safety pin 67 can engage with the corresponding slot 66 to prevent the sliding sleeve 61 from sliding on the first side rod 41 due to external force or vibration. A slot 66 can also be provided on the first side rod 41 at the intermediate position, so that when the sliding sleeve 61 is in the intermediate position, the safety pin 67 can be inserted into the slot 66 to lock the sliding sleeve 61 in the intermediate position.

[0034] When the ladder frame is in the first staircase configuration, such as Figures 1-3As shown, the sliding sleeve 61 is in the first locking position. The sliding sleeve 61 is fitted with the second side rod 51, which locks the first ladder frame 4 and the second ladder frame 5 in a straightened state. The limiting groove 62 of the sliding sleeve 61 is engaged with the first limiting block 64, so that the first movable panel of the movable step 43 is in a horizontal state and the first fixed panel of the second ladder frame 5 is also in a horizontal state. Thus, each first movable panel and the first fixed panel together form a step in the form of a ladder frame staircase. The staircase direction of the ladder frame faces the first direction.

[0035] When the ladder frame needs to switch from the first staircase configuration to the first platform configuration, the safety pin 67 is pulled out of the slot 66 corresponding to the first locking position, and then the sliding sleeve 61 is moved along the length of the first side rod 41, causing the sliding sleeve 61 to disengage from the first locking position and move to the intermediate position. Figure 4 As shown, the sliding sleeve 61 is not engaged with the second side rod 51, and the limiting groove 62 is not engaged with the first limiting block 64 or the second limiting block 65. The second ladder 5 and the first ladder 4 have rotational freedom, and the movable pedal 43 and the first side rod 41 also have rotational freedom. Then, the first ladder 4 is rotated upward (clockwise) into the reserved space, and the second ladder 5 automatically remains in a drooping state due to gravity. The movable pedal 43 is rotated until the first movable panel is in a horizontal state, and then the sliding sleeve 61 is moved from the middle position to the second locking position. Figures 8-10 As shown, the sliding sleeve 61 moves directly above the limiting plate 63. The limiting plate 63 supports the entire first ladder frame 4 by supporting the sliding sleeve 61, keeping the first ladder frame 4 in a horizontal state within the reserved space. At the same time, the limiting groove 62 engages with the second limiting block 65, keeping the first movable surface of the movable pedal 43 in a horizontal state. The first movable panels are spliced ​​together to form a bearing platform. The safety pin 67 is inserted into the slot 66 corresponding to the second locking position, locking the position of the sliding sleeve 61 on the first side rod 41.

[0036] When the ladder frame needs to be switched from the first staircase configuration to the second staircase configuration, the safety pin 67 is pulled out of the slot 66 corresponding to the first locking position, and then the sliding sleeve 61 is moved along the length of the first side rod 41, so that the sliding sleeve 61 disengages from the first locking position and moves to the position shown in the image. Figure 4 The intermediate workstation is shown; then the top of the ladder frame is moved to the left along the guide rail 3, from the first end of the guide rail 3 to the second end of the guide rail 3. During this process, the top of the ladder frame can smoothly move to the second end of the guide rail 3 through the rotation and bending between the first ladder frame 4 and the second ladder frame 5. After the bottom of the first ladder frame 4 faces the lower right corner of the support frame 1, the second ladder frame 5 is straightened to the first ladder frame 4, and the sliding sleeve 61 is moved from the intermediate workstation to the first locking workstation, as shown. Figures 11-13As shown, the sliding sleeve 61 is re-sleeved with the second side rod 51, and the limiting groove 62 is engaged with the first limiting block 64, so that the second movable panel of the movable pedal 43 is in a horizontal state, and the second fixed panel of the second ladder frame 5 is also in a horizontal state, so that each second movable panel and the second fixed panel together form a step in the form of a ladder frame staircase, and the staircase direction of the ladder frame faces the second direction.

[0037] When the frame needs to switch from the second staircase configuration to the second platform configuration, pull out the safety pin 67, then move the sliding sleeve 61 so that it disengages from the first locking position and moves to the position shown. Figure 4 The intermediate workstation is shown; then the first ladder 4 is rotated upwards (counterclockwise) into the reserved space, and the second ladder 5 automatically remains in a drooping state due to gravity. The movable pedal 43 is rotated until the second movable panel is in a horizontal state, and then the sliding sleeve 61 is moved from the intermediate workstation to the second locking workstation, as shown. Figures 14-16 As shown, the sliding sleeve 61 moves directly above the limiting plate 63. The limiting plate 63 supports the entire first ladder frame 4 by supporting the sliding sleeve 61. At the same time, the limiting groove 62 engages with the second limiting block 65, so that the second movable surface of the movable pedal 43 remains horizontal. The second movable panels are spliced ​​together to form a bearing platform. The safety pin 67 is inserted to lock the sliding sleeve 61 onto the first side rod 41.

[0038] In summary, when changing the form of the ladder frame, the sliding sleeve 61 needs to be moved from the current first locking position or second locking position to the intermediate position so that the second ladder frame 5 and the first ladder frame 4 have rotational freedom, and the movable pedal 43 and the first side rod 41 have rotational freedom.

[0039] The foregoing description of certain exemplary embodiments of the present invention should not be construed as limiting the scope of protection of the claims. Those skilled in the art will recognize that the described embodiments can be modified in other ways without departing from the spirit and scope of the invention.

Claims

1. A ladder scaffold with adjustable ladder direction and shape, comprising a support frame, scaffold boards disposed on top of the support frame, and a ladder frame disposed on the support frame, characterized in that: The ladder frame includes a first ladder frame and a second ladder frame that are rotatably connected end to end. The first ladder frame is adapted to the length of the scaffold board. A guide rail is horizontally mounted on the top of the support frame. The end of the first ladder frame away from the second ladder frame is slidably and rotatably connected to the guide rail. As the ladder frame rotates on the guide rail, it has both a staircase shape and a platform shape. When the ladder frame is in the staircase shape, the first and second ladder frames are straightened, the ladder frame is placed at an angle with its top located at either end of the guide rail, and its bottom abuts the ground. The direction of the staircase can be adjusted by sliding the top of the ladder frame between the two ends of the horizontal guide rail. When the ladder frame is in the platform shape, the first and second ladder frames are perpendicular to each other, and the first ladder frame is placed horizontally on the guide rail and aligned with the scaffold board. The first ladder frame includes a first side rod that slides and rotates with the guide rail, a plurality of movable pedals that are rotatably connected to the first side rod in parallel, and a connecting rod that is rotatably connected to each movable pedal. Each movable pedal includes two movable panels that are vertically connected. The first side rod, the connecting rod, and any two adjacent movable pedals form a parallelogram mechanism. The first ladder is equipped with a locking assembly, which includes a sliding sleeve that is slidably connected to the first side rod and has a limit groove, a limit plate that is fixedly connected to the guide rail, a first limit block that is fixedly connected to the first movable step of the adjacent second ladder, and a square second limit block that is fixedly connected to the second movable step of the adjacent second ladder. During the sliding stroke of the sleeve along the length of the first side rod, it has the following characteristics: The ladder frame is locked in the first locking position in the staircase shape, and the sliding sleeve is sleeved with the second side rod and is engaged with the first limit block through the limit groove. The ladder frame is locked in the second locking position in the platform form, and the sliding sleeve overlaps the limiting plate and is engaged with the second limiting block through the limiting groove.

2. The ladder scaffolding with adjustable ladder direction and shape according to claim 1, characterized in that, The second ladder includes a second side bar rotatably connected to the first side bar, and a plurality of fixed pedals fixedly connected in parallel to the second side bar, each fixed pedal including two fixed panels connected vertically.

3. The ladder scaffolding with adjustable ladder direction and shape according to claim 1, characterized in that, The first ladder is equipped with a locking assembly, which is configured as follows: It can lock the first and second ladders in a straightened state; Able to horizontally lock the first ladder onto the guide rail; and It can lock any of the movable panels of the movable pedal in a horizontal position.

4. The ladder scaffolding with adjustable ladder direction and shape according to claim 1, characterized in that, The first side rod has slots for a first locking position and a second locking position corresponding to the sliding sleeve, and a safety pin that can be inserted into the sliding sleeve to engage with the slot.

5. The ladder scaffolding with adjustable ladder direction and shape according to claim 2, characterized in that, The distance between each adjacent movable pedal is equal to the distance between each adjacent fixed pedal; When the ladder frame is in the staircase configuration, the distance between adjacent movable steps and fixed steps is equal to the distance between adjacent movable steps.

6. The ladder scaffolding with adjustable ladder direction and shape according to claim 1, characterized in that, The guide rail has a guide groove along its length on its side, and a cylindrical slide rod passing through the guide groove is provided at the end of the first side rod away from the second side rod.

7. The ladder scaffolding with adjustable ladder direction and shape according to claim 1, characterized in that, When the ladder frame is in the form of a staircase, the angle between the ladder frame and the ground is 45°.

8. The ladder scaffolding with adjustable ladder direction and shape according to claim 1, characterized in that, The length of the second ladder is not greater than the height of the scaffold board, and the sum of the lengths of the first ladder and the second ladder is not less than the height of the scaffold board.

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