Ladder rung and ladder

Abstract

The utility model provides a kind of ladder handrail and ladder, it is related to ladder field, the ladder handrail includes handrail rod and the installation structure connected in the both ends of handrail rod, each installation structure is respectively included connecting seat and spin lock component;Two ends of handrail rod are installed in connecting seat;Spin lock component includes two rotary blocks, rotary rod piece, nut knob and elastic member;Two rotary blocks are located between the one side of connecting seat and are equipped with the elastic member;The section of two rotary blocks along rotary rod piece radial is all polygon, and the side surface of two rotary blocks mutually is the inclined plane or curved surface that mutually splices along rotary rod piece axial direction.The ladder includes preceding ladder handrail.The ladder handrail provided by the utility model can improve installation efficiency while realizing reliable locking, and can also be quickly disassembled according to needs, to quickly disassemble handrail to reduce the space occupied by ladder in storage and transportation process, avoid ladder to be damaged by knock, reduce transportation and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of ladders, and in particular to a ladder handrail and a ladder. Background Technology

[0002] Ladders are common climbing tools widely used in homes, construction, and industry. To improve safety, some ladders are equipped with handrails on both sides to provide additional support and balance.

[0003] In the existing technology, for ladders with handrails on both sides, the handrails are mainly installed by directly fixing metal parts to the ladder frame. The two ends of the handrail are mechanically connected to the ladder frame by bolt and nut assemblies and tightened with a wrench. This method has at least the following technical problems: (1) When installing ladder handrails, multiple mounting holes need to be precisely aligned, and each connection point needs to be tightened individually, making the installation process tedious and time-consuming; (2) The ladder handrail and the ladder frame are fixed structures. During transportation and storage, the protruding handrail structure not only occupies a large space, but is also prone to deformation and damage due to collision or squeezing. Utility Model Content

[0004] The purpose of this utility model is to provide a ladder handrail and a ladder to alleviate at least one of the above-mentioned technical problems existing in the prior art.

[0005] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions: In a first aspect, the present invention provides a ladder handrail, including a handrail bar and mounting structures connected to both ends of the handrail bar, each of the mounting structures including a connecting seat and a rotary locking assembly; Both ends of the handrail are mounted on the connecting seat; The rotary lock assembly includes a first rotating block, a second rotating block, a rotating rod, a nut knob, and an elastic element; The first rotating block and the second rotating block are disposed on one side of the connecting seat, and the first rotating block is located between the connecting seat and the second rotating block. The nut knob is disposed on the side of the connecting seat opposite to the first rotating block. The rotating rod passes through the through holes provided on the first rotating block and the connecting seat. One end of the rotating rod is fixedly connected to or circumferentially positioned on the second rotating block, and the other end of the rotating rod is threadedly connected to the nut knob. The cross-sections of the first rotating block and the second rotating block along the radial direction of the rotating rod are both polygons, and the surfaces of the first rotating block and the second rotating block facing each other are inclined or curved surfaces that are joined together along the axial direction of the rotating rod. The elastic element is disposed between the first rotating block and the second rotating block, and is configured to store elastic potential energy when the first rotating block and the second rotating block approach each other along the axial direction of the rotating rod, and to release the elastic potential energy in a free state to separate the first rotating block and the second rotating block from each other.

[0006] In an optional embodiment, the rotating rod is a bolt, including an integrally connected screw and a limiting end; the screw passes through a through hole provided on the second rotating block, the first rotating block and the connecting seat, the limiting end is located on the side of the second rotating block away from the first rotating block and is circumferentially positioned on the second rotating block, and the end of the screw away from the limiting end is threadedly connected to the nut knob.

[0007] Optionally, a polygonal limiting groove is provided on the side surface of the second rotating block opposite to the first rotating block, and the perforation provided on the second rotating block is located inside the polygonal limiting groove; the shape of the limiting end is the same as the shape of the polygonal limiting groove; the limiting end is limited inside the polygonal limiting groove and blocked outside the perforation provided on the second rotating block.

[0008] In an optional embodiment, the surfaces of the first rotating block and the second rotating block facing each other are both flat inclined surfaces, and the sum of the inclination angles of the two inclined surfaces is 180°.

[0009] In an optional embodiment, the elastic element is a spring sleeved on the outside of the rotating rod.

[0010] In an optional embodiment, the connecting seat includes a connecting seat one and a connecting seat two, the end of the handrail is fixedly connected to the connecting seat one, the rotating rod passes through a through hole provided on the connecting seat two, and the connecting seat one and the connecting seat two are rotatably connected. A folding assembly is installed between the first connecting seat and the second connecting seat, the folding assembly being configured to adjust and lock the rotation angle between the first connecting seat and the second connecting seat.

[0011] In an optional embodiment, the folding assembly includes a stepped pin, a positioning spring, a retaining spring, and an end cap; The first connecting seat has two connecting pieces 1 extending towards the first connecting seat and towards the second connecting seat, each connecting piece 1 having a circular shaft hole; the second connecting seat has two connecting pieces 2 extending towards the first connecting seat and towards the same side as the second connecting seat, each connecting piece 2 having an arc-shaped guide channel, the guide channel including an arc-shaped guide hole connected in sequence and two end circular holes respectively located at both ends of the arc-shaped guide hole and connected to the arc-shaped guide hole, and the diameter of the end circular holes is greater than the width of the arc-shaped guide hole; the first connecting piece and the second connecting piece 2 are fitted together in a one-to-one correspondence; The stepped pin passes through the circular shaft hole provided in the two connecting pieces and the guide channel provided in the two connecting pieces. The stepped pin includes a limiting head, a head end rod segment, a middle rod segment, and a tail end rod segment connected axially in sequence. The outer diameter of the limiting head is greater than the diameter of the end circular hole, which is greater than the diameter of the head end rod segment, which is greater than the diameter of the arc-shaped guide hole, which is greater than the diameter of the middle rod segment. The diameter of the arc-shaped guide hole is greater than the diameter of the tail end rod segment. The end cap and the retaining spring are spaced apart and fixedly connected to the tail end rod segment, and the positioning spring is sleeved on the outside of the middle rod segment; and, along the axial direction of the stepped pin: the end cap and the limiting head are respectively located on the opposite side of the two connecting pieces at the two ends of the four connecting pieces, and there is a gap between the end cap and the corresponding connecting piece; the retaining spring and the positioning spring are both located between the two connecting pieces in the middle of the four connecting pieces; one end of the positioning spring abuts against the retaining spring, and the other end of the positioning spring abuts against the connecting piece facing the limiting head, so that the positioning spring is in a state of being compressed and storing elastic potential energy, thereby positioning the head end rod segment inside a round hole provided in the connecting piece two near the limiting head; Pressing the end cap toward the limiting head compresses the positioning spring, causing the stepped pin to move axially toward the limiting head, thereby disengaging the head end segment from the corresponding end hole and allowing the middle segment to enter the end hole and slide along the arc-shaped guide hole into another end hole.

[0012] In an optional embodiment, the tail end rod segment is provided with a positioning hole one, and the end cap sidewall is provided with a positioning hole two. The end cap is fixed to the tail end rod segment by means of a positioning pin passing through the positioning hole two and being fixed to the positioning hole one.

[0013] In an optional embodiment, the first connecting seat and the second connecting seat are rotatably connected by a bolt and nut assembly.

[0014] Secondly, this utility model provides a ladder, including a ladder frame and a ladder handrail as described in any of the optional embodiments of the first aspect; A footboard is installed on the inner side of the ladder frame, and an installation opening is provided on the outer side of the ladder frame. The first rotating block and the second rotating block are located inside the installation opening. When the rotating rod is rotated by the nut knob, the second rotating block rotates relative to the first rotating block, and the outer wall of the second rotating block is frictionally locked with the inner wall of the mounting port.

[0015] The embodiments of this utility model can achieve at least the following beneficial effects: In this embodiment of the invention, the inclined / curved surface design between the first and second rotating blocks allows for automatic adaptation to different sizes of mounting openings during the locking process, providing a certain degree of self-adaptability. The elastic element not only serves a reset function but also provides stable engagement pressure during the locking process, ensuring the continuity and stability of the locking force. The self-locking characteristic of the threaded connection between the nut knob and the rotating rod, along with the rebound force of the elastic element, forms a dual locking mechanism, enhancing the reliability of the locking state (for specific usage, please refer to the detailed description in the specific embodiments section of this application).

[0016] Compared with the prior art, the ladder handrail provided in this embodiment of the utility model, through the ingenious design of the rotary locking component 3, converts axial displacement into radial expansion. Locking or unlocking can be completed with a simple rotation operation without the need for additional tools. This makes it easy to install or remove the ladder handrail from the ladder frame. It not only achieves reliable locking but also improves installation efficiency. It can also be quickly disassembled as needed, so that the handrail can be quickly removed during storage and transportation to reduce the space occupied by the ladder, avoid damage to the ladder from bumps, and reduce transportation and maintenance costs.

[0017] In addition, this utility model embodiment also provides several optional implementation methods. The specific implementation method section of this specification will provide a detailed description and explanation of the specific structure and functional effects of these optional implementation methods. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the overall structure of the end area of ​​the handrail in the ladder handrail provided in an embodiment of this utility model; Figure 2An exploded view of the overall structure of the end area of ​​the handrail in the ladder handrail provided in this embodiment of the utility model; Figure 3 Schematic diagram of the overall structure of the ladder provided in the embodiment of this utility model Figure 1 ; Figure 4 A schematic diagram of the overall structure of the ladder provided in this embodiment of the utility model. Figure 2 ; Figure 5 Schematic diagram of the overall structure of the ladder provided in the embodiment of this utility model Figure 3 ; Figure 6 A schematic diagram of the overall structure of the ladder provided in this embodiment of the utility model. Figure 4 .

[0020] Icon: 1 - Handrail; 2-Connecting seat; 21-Connecting seat one; 211-Connecting piece one; 22-Connecting seat two; 221-Connecting piece two; 220-Guide channel; 3-Rotary lock assembly; 31-First rotating block; 32-Second rotating block; 321-Polygonal limiting groove; 33-Rotating rod; 34-Nut knob; 35-Elastic element; 4-Folding assembly; 41-Stepped pin; 411-Limit head; 412-Head end rod segment; 413-Middle rod segment; 414-Tail end rod segment; 42-Positioning spring; 43-Snap ring stop; 44-End cap; 45-Positioning pin; 5-Ladder frame; 51-Mounting port; 6-Pedal. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the accompanying drawings indicate similar items. Therefore, once an item is defined in one accompanying drawing, it does not need to be further defined and explained in subsequent accompanying drawings.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the terms "horizontal" and "vertical" do not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] First aspect This embodiment provides a ladder handrail, as shown in the reference. Figure 1 and Figure 2 The ladder handrail includes a handrail 1 and mounting structures connected to both ends of the handrail 1. Each mounting structure includes a connecting seat 2, a rotary locking assembly 3, and an elastic element 35.

[0029] Wherein: both ends of the handrail 1 are installed on the connecting seat 2. The rotary lock assembly 3 includes a first rotating block 31, a second rotating block 32, a rotating rod 33, and a nut knob 34; the first rotating block 31 and the second rotating block 32 are located on one side of the connecting seat 2, and the first rotating block 31 is located between the connecting seat 2 and the second rotating block 32, and the nut knob 34 is located on the side of the connecting seat 2 away from the first rotating block 31; the rotating rod 33 passes through the through holes provided on the first rotating block 31 and the connecting seat 2, one end of the rotating rod 33 is fixedly connected to or circumferentially positioned on the second rotating block 32, and the other end of the rotating rod 33 is threadedly connected to the nut knob. The cross-sections of the first rotating block 31 and the second rotating block 32 along the radial direction of the rotating rod 33 are both polygonal. The surfaces of the first rotating block 31 and the second rotating block 32 facing each other are inclined or curved surfaces that are joined together along the axial direction of the rotating rod 33. The elastic element 35 is disposed between the first rotating block 31 and the second rotating block 32 and is configured to store elastic potential energy when the first rotating block 31 and the second rotating block 32 approach each other along the axial direction of the rotating rod 33, and to release the elastic potential energy in a free state to separate the first rotating block 31 and the second rotating block 32 from each other.

[0030] For usage instructions, please refer to [link / reference]. Figures 3 to 6 The aforementioned ladder handrails are installed on both sides of the ladder frame 5. The installation method is as follows: the outer side of the ladder frame 5 is provided with an installation port 51. The cross-sectional dimension of the installation port 51 along the radial direction of the rotating rod 33 is slightly larger than the cross-sectional dimension of the first rotating block 31 and the second rotating block 32 along the radial direction of the rotating rod 33.

[0031] In the initial state, the first rotating block 31 and the second rotating block 32 are kept in a relatively separated state under the push of the elastic member 35. At this time, the splicing slope or curved surface of the first rotating block 31 and the second rotating block 32 is not completely attached. The overall structure of the first rotating block 31 and the second rotating block 32 is small in radial dimension, which makes it easy to insert into the installation port 51 of the ladder frame 5. Then, the user rotates the nut knob 34 to drive the rotating rod 33 to move along its axial direction (threaded transmission). The axial displacement of the rotating rod 33 causes the second rotating block 32 to rotate while overcoming the elastic force of the elastic element 35 and moving axially closer to the first rotating block 31. The splicing inclined surface or curved surface between the second rotating block 32 and the first rotating block 31 slides relative to each other in the circumferential direction, realizing the radial expansion of the overall structure of the first rotating block 31 and the second rotating block 32. Due to the thread self-locking characteristic between the nut knob 34 and the rotating rod 33, combined with the rebound force provided by the elastic element 35, the first rotating block 31 and the second rotating block 32 maintain a stable splicing state. At this time, a large frictional force is formed between the outer wall of the second rotating block 32 and the inner wall of the mounting port 51 to form a friction lock, effectively preventing the handrail 1 from loosening or falling off during use.

[0032] When the ladder handrail needs to be disassembled, the user rotates the nut knob 34 in the opposite direction, the rotating rod 33 retracts axially, the elastic element 35 releases stored energy, pushing the first rotating block 31 and the second rotating block 32 to separate. The contact force between the splicing inclined surface or curved surface disappears, and the friction between the outer wall of the second rotating block 32 and the inner wall of the mounting port 51 is released, so it can be easily disassembled.

[0033] Specifically, in this embodiment, the design of the splicing inclined / curved surface between the first rotating block 31 and the second rotating block 32 enables it to automatically adapt to different sizes of mounting openings 51 during the locking process, thus possessing a certain degree of self-adaptability; the elastic element 35 not only serves a reset function but also provides stable splicing pressure during the locking process, ensuring the continuity and stability of the locking force; the self-locking characteristic of the threaded connection between the nut knob and the rotating rod, together with the rebound force of the elastic element 35, forms a dual locking mechanism, enhancing the reliability of the locking state.

[0034] Compared with the prior art, the ladder handrail provided in this embodiment, through the ingenious design of the rotary locking component 3, converts axial displacement into radial expansion. Locking or unlocking can be completed with a simple rotation operation without the need for additional tools. This facilitates the installation or removal of the ladder handrail from the ladder frame, improving installation efficiency while achieving reliable locking. It can also be quickly disassembled as needed, reducing the space occupied by the ladder during storage and transportation, preventing damage to the ladder from bumps and collisions, and reducing transportation and maintenance costs.

[0035] In this embodiment, optionally, the through holes provided on the first rotating block 31 and the second rotating block 32 for the rotating rod 33 to pass through can be circular holes or elliptical holes, preferably elliptical holes to meet the requirements of adapting to various rod sizes.

[0036] In an optional embodiment of this invention, the rotating rod 33 is a bolt, comprising an integrally connected threaded rod and a limiting end. The threaded rod passes through holes provided on the second rotating block 32, the first rotating block 31, and the connecting seat 2. The limiting end is located on the side of the second rotating block 32 opposite to the first rotating block 31 and is circumferentially positioned on the second rotating block 32. The end of the threaded rod away from the limiting end is threadedly connected to a nut knob. The rotating rod 33 provided in this optional embodiment uses a bolt, which is a standard part, facilitating manufacturing, simplifying the installation structure, and reducing manufacturing costs. In this embodiment, there are various ways to circumferentially position one end of the rotating rod 33 against the second rotating block 32. For example, but not limited to, when the rotating rod 33 is the aforementioned bolt, optionally, a polygonal limiting groove 321 is provided on the surface of the second rotating block 32 facing away from the first rotating block 31, and the through hole provided on the second rotating block 32 is located inside the polygonal limiting groove 321; the rotating rod 33 is a bolt, and the shape of its limiting end is the same as the shape of the polygonal limiting groove 321, which can be a square, hexagon, or other polygonal shape, and the specific shape can be selected according to actual needs; its limiting end is limited inside the polygonal limiting groove 321 and blocked outside the through hole provided on the second rotating block 32. Since the shape of the limiting end matches the polygonal limiting groove 321, the rotating rod 33 will not move axially relative to the second rotating block 32 when rotating, but it can transmit rotational force. Thus, when the user rotates the nut knob 34, the rotating rod 33 rotates with the second rotating block 32.

[0037] In an optional embodiment of this invention, the surfaces of the first rotating block 31 and the second rotating block 32 facing each other are both flat inclined surfaces, and the sum of the inclination angles of the two inclined surfaces is 180°. In this optional embodiment, the inclined surface design simplifies the assembly process, improves production efficiency, and makes the relative movement between the first rotating block 31 and the second rotating block 32 smoother. Smoother relative movement reduces wear between components and extends service life. Compared with complex curved surfaces, the inclined surface design results in less wear and lower maintenance costs.

[0038] In this embodiment, the elastic element 35 can be a spring disposed parallel to the rotating rod 33 between the first rotating block 31 and the second rotating block 32, or it can be other elastic components. In an optional embodiment, the elastic element 35 is a spring sleeved on the outside of the rotating rod 33. By using the rotating rod 33 as a central guide structure, the elastic restoring force of the elastic element 35 is improved, ensuring that the first rotating block 31 and the second rotating block 32 quickly separate along the axial direction of the rotating rod 33 in the unlocked state.

[0039] In an optional embodiment, the connecting seat 2 includes a first connecting seat 21 and a second connecting seat 22. The end of the handrail 1 is fixedly connected to the first connecting seat 21 by bolt and nut assembly or other fasteners or by welding. The rotating rod 33 passes through a through hole provided on the second connecting seat 22, and the first connecting seat 21 and the second connecting seat 22 are rotatably connected. A folding assembly 4 is installed between the first connecting seat 21 and the second connecting seat 22. The folding assembly 4 is configured to adjust and lock the rotation angle between the first connecting seat 21 and the second connecting seat 22. In this optional embodiment, by designing the folding assembly 4, the space occupied by the ladder handrail can be reduced when storing and transporting the ladder, and the handrail can be protected from protruding from the ladder frame 5 without having to remove the handrail, making it convenient for users.

[0040] In this optional embodiment, further optionally, refer to Figure 1 and Figure 2 The aforementioned folding assembly 4 includes a stepped pin 41, a positioning spring 42, a retaining spring 43, and an end cap 44.

[0041] Connecting seat 1 21 has two connecting pieces 211 extending towards connecting seat 22 on the same side as connecting seat 21. Each connecting piece 211 has a circular shaft hole. Connecting seat 22 has two connecting pieces 221 extending towards connecting seat 21 on the same side as connecting seat 22. Each connecting piece 221 has an arc-shaped guide channel 220. The guide channel 220 includes an arc-shaped guide hole connected in sequence and two end circular holes respectively located at both ends of the arc-shaped guide hole and connected to the arc-shaped guide hole. The diameter of the end circular holes is larger than the width of the arc-shaped guide hole. Connecting pieces 211 and connecting pieces 221 are fitted one-to-one. The arrangement of the four connecting pieces includes: two connecting pieces 211 located between two connecting pieces 221, or two connecting pieces 221 located between two connecting pieces 211, or connecting pieces 211 and connecting pieces 221 arranged alternately. Preferably, as shown in the figure. Figure 1 and Figure 2 As shown, the two connecting pieces 1 211 are positioned between the two connecting pieces 221.

[0042] The stepped pin 41 passes through the circular shaft holes provided in the two connecting pieces 1 211 and the guide channels 220 provided in the two connecting pieces 221. The stepped pin 41 includes a limiting head 411, a head end segment 412, a middle segment 413, and a tail end segment 414 connected axially in sequence. The outer diameter of the limiting head 411 is greater than the diameter of the circular hole at the middle end of the guide channel 220, which is greater than the diameter of the head end segment 412, which is greater than the diameter of the arc-shaped guide hole in the guide channel 220, which is greater than the diameter of the middle segment 413. Furthermore, the diameter of the arc-shaped guide hole in the guide channel 220 is greater than the diameter of the tail end segment 414. The tail end segment 414 may have the same radial dimension as the middle segment 413 or... Figure 2 The radial dimension shown is slightly larger than that of the middle section 413, but it should be ensured that it can rotate along the arc-shaped guide hole in the guide channel 220.

[0043] End cap 44 and retaining ring 43 are spaced apart and fixedly connected to tail end rod segment 414. Positioning spring 42 is sleeved on the outside of middle rod segment 413. Along the axial direction of stepped pin 41: end cap 44 and limiting head 411 are respectively located on the opposite side of the two connecting pieces at the two ends of the four connecting pieces, and there is a gap between end cap 44 and the corresponding connecting piece. Retaining ring 43 and positioning spring 42 are both located between the two connecting pieces in the middle of the four connecting pieces. One end of positioning spring 42 abuts against retaining ring 43, and the other end of positioning spring 42 abuts against the connecting piece facing the limiting head 411, so that positioning spring 42 is in a state of being compressed and storing elastic potential energy, thereby positioning head end rod segment 412 inside an end round hole provided in connecting piece 221 near the limiting head 411.

[0044] Pressing the end cap 44 towards the limiting head 411 further compresses the positioning spring 42, causing the stepped pin 41 to move axially toward the limiting head 411 until one side surface of the end cap 44 contacts the surface of the connecting piece closest to the end cap 44. This causes the head end rod segment 412 to disengage from the corresponding end hole of the guide channel 220, and the middle rod segment 413 to enter the end hole. At this point, rotating the handrail 1 and the connecting seat 21 allows the middle rod segment 413 of the stepped pin 41 to move along the guide channel 220. The arc-shaped guide hole slides from one end hole of the guide channel 220 into the other end hole. At this time, the end cover 44 is released, and the positioning spring 42 rebounds, so that the stepped pin 41 rebounds axially in the direction away from the limiting head 411 to the initial state where the positioning spring 42 is compressed and storing elastic potential energy. Thus, under the elastic force of the positioning spring 42, the head end rod segment 412 is positioned inside one end hole of the connecting piece 221 near the limiting head 411, thus achieving the current positioning.

[0045] In this optional embodiment, the rotatable angle of the handrail 1 can be designed according to the angle of the tread 6 provided on the ladder frame 5. For example, but not limited to, the central angle of the two end circular through holes in the guide channel 220 can be any angle between 80°, 85°, 90° or 80°~90°.

[0046] To facilitate disassembly and assembly, in an optional embodiment of this invention, the tail end rod segment 414 is provided with a positioning hole one, and the end cap 44 is provided with a positioning hole two on its side wall. The positioning pin 45 passes through the positioning hole two and is fixed to the positioning hole one by means of threaded connection, interference fit, or snap-fit, so as to fix the end cap 44 to the tail end rod segment 414. However, the fixing method between the tail end rod segment 414 and the end cap 44 is not limited to this. For example, but not limited to, the two can also be fixed by threaded connection or other means.

[0047] Alternatively, but not limited to, connecting seat 1 21 and connecting seat 2 22 are rotatably connected by a bolt and nut assembly.

[0048] Second aspect This embodiment provides a ladder, as shown in the following example. Figures 3 to 6 The ladder includes a ladder frame 5 and a ladder handrail provided in any optional embodiment of the first aspect; a tread 6 is installed on the inner side of the ladder frame 5, and a mounting opening 51 is provided on the outer side of the ladder frame 5. The cross-sectional dimension of the mounting opening 51 along the radial direction of the rotating rod 33 is slightly larger than the cross-sectional dimensions of the first rotating block 31 and the second rotating block 32 along the radial direction of the rotating rod 33. The first rotating block 31 and the second rotating block 32 are located inside the mounting opening 51; when the rotating rod 33 is rotated by the nut knob 34, the second rotating block 32 rotates relative to the first rotating block 31, and the outer wall of the second rotating block 32 is frictionally locked with the inner wall of the mounting opening 51.

[0049] For more specific structures and effects of the ladder provided in this embodiment, please refer to the optional or preferred embodiments in the first aspect.

[0050] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. The above embodiments in this specification are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A ladder handrail, characterized in that, It includes a handrail (1) and mounting structures connected to both ends of the handrail (1), each of the mounting structures including a connecting seat (2) and a rotary lock assembly (3). The two ends of the handrail (1) are installed on the connecting seat (2); The rotary lock assembly (3) includes a first rotating block (31), a second rotating block (32), a rotating rod (33), a nut knob (34), and an elastic element (35). The first rotating block (31) and the second rotating block (32) are located on one side of the connecting seat (2), and the first rotating block (31) is located between the connecting seat (2) and the second rotating block (32). The nut knob (34) is located on the side of the connecting seat (2) away from the first rotating block (31). The rotating rod (33) passes through the through holes provided on the first rotating block (31) and the connecting seat (2). One end of the rotating rod (33) is fixedly connected to or circumferentially positioned on the second rotating block (32), and the other end of the rotating rod (33) is threadedly connected to the nut knob. The first rotating block (31) and the second rotating block (32) have polygonal cross sections along the radial direction of the rotating rod (33), and the surfaces of the first rotating block (31) and the second rotating block (32) facing each other are inclined or curved surfaces that are joined together along the axial direction of the rotating rod (33). The elastic element (35) is disposed between the first rotating block (31) and the second rotating block (32), and is configured to store elastic potential energy when the first rotating block (31) and the second rotating block (32) approach each other along the axial direction of the rotating rod (33), and to release the elastic potential energy in a free state to separate the first rotating block (31) and the second rotating block (32) from each other.

2. The ladder handrail according to claim 1, characterized in that, The rotating rod (33) is a bolt, including an integrally connected screw and a limiting end; The screw passes through the holes provided on the second rotating block (32), the first rotating block (31) and the connecting seat (2). The limiting end is located on the side of the second rotating block (32) away from the first rotating block (31) and is circumferentially positioned on the second rotating block (32). The end of the screw away from the limiting end is threadedly connected to the nut knob.

3. The ladder handrail according to claim 2, characterized in that, A polygonal limiting groove (321) is provided on the side surface of the second rotating block (32) opposite to the first rotating block (31), and the through hole provided on the second rotating block (32) is located inside the polygonal limiting groove (321); The shape of the limiting end is the same as the shape of the polygonal limiting groove (321); The limiting end is located inside the polygonal limiting groove (321) and blocked outside the perforation provided on the second rotating block (32).

4. The ladder handrail according to claim 1, characterized in that, The surfaces of the first rotating block (31) and the second rotating block (32) facing each other are both flat inclined surfaces, and the sum of the inclination angles of the two inclined surfaces is 180°.

5. The ladder handrail according to claim 1, characterized in that, The elastic element (35) is a spring sleeved on the outside of the rotating rod (33).

6. The ladder handrail according to claim 1, characterized in that, The connecting seat (2) includes a connecting seat one (21) and a connecting seat two (22). The end of the handrail (1) is fixedly connected to the connecting seat one (21). The rotating rod (33) passes through the through hole provided on the connecting seat two (22). The connecting seat one (21) and the connecting seat two (22) are rotatably connected. A folding assembly (4) is installed between the first connector (21) and the second connector (22), the folding assembly (4) being configured to adjust and lock the rotation angle between the first connector (21) and the second connector (22).

7. The ladder handrail according to claim 6, characterized in that, The folding assembly (4) includes a stepped pin (41), a positioning spring (42), a retaining spring (43), and an end cap (44). The first connecting seat (21) is provided with two connecting pieces (211) extending toward the second connecting seat (22) on the same side as the first connecting seat (21). Each connecting piece (211) is provided with a circular shaft hole. The second connecting seat (22) is provided with two connecting pieces (221) extending toward the first connecting seat (21) on the same side as the second connecting seat (22). Each connecting piece (221) is provided with an arc-shaped guide channel (220). The guide channel (220) includes an arc-shaped guide hole that is connected in sequence and two end circular holes that are respectively provided at both ends of the arc-shaped guide hole and are connected to the arc-shaped guide hole. The diameter of the end circular holes is greater than the width of the arc-shaped guide hole. The first connecting piece (211) and the second connecting piece (221) are fitted together in a one-to-one correspondence. The stepped pin (41) passes through the circular shaft holes provided in the two connecting pieces one (211) and the guide channels (220) provided in the two connecting pieces two (221). The stepped pin (41) includes a limiting head (411), a head end rod segment (412), a middle rod segment (413), and a tail end rod segment (414) connected axially in sequence. The outer diameter of the limiting head (411) is greater than the diameter of the end circular hole, which is greater than the diameter of the head end rod segment (412), which is greater than the diameter of the arc-shaped guide hole, which is greater than the diameter of the middle rod segment (413), and the diameter of the arc-shaped guide hole is greater than the diameter of the tail end rod segment (414). The end cap (44) and the retaining spring (43) are spaced apart and fixedly connected to the tail end rod segment (414), and the positioning spring (42) is sleeved on the outside of the middle rod segment (413); and, along the axial direction of the stepped pin (41): the end cap (44) and the limiting head (411) are respectively located on the opposite side of the two connecting pieces at both ends of the four connecting pieces, and there is a gap between the end cap (44) and the corresponding connecting piece, the retaining spring (43) and the positioning spring (411) are fixedly connected to the tail end rod segment (414). The springs (42) are all located between the two middle connecting pieces among the four connecting pieces. One end of the positioning spring (42) abuts against the snap ring stop (43), and the other end of the positioning spring (42) abuts against the connecting piece facing the limiting head (411), so that the positioning spring (42) is in a state of being compressed and storing elastic potential energy, thereby positioning the head end rod segment (412) inside a round hole at one end of the connecting piece two (221) near the limiting head (411); Pressing the end cap (44) toward the limiting head (411) can compress the positioning spring (42), causing the stepped pin (41) to move axially toward the limiting head (411), thereby causing the head end rod segment (412) to disengage from the corresponding end hole and the middle rod segment (413) to enter the end hole and slide along the arc-shaped guide hole into another end hole.

8. The ladder handrail according to claim 7, characterized in that, The tail end rod segment (414) is provided with a positioning hole one, and the end cap (44) is provided with a positioning hole two on its side wall. The end cap (44) is fixed to the tail end rod segment (414) by means of a positioning pin (45) passing through the positioning hole two and fixing it to the positioning hole one.

9. The ladder handrail according to claim 6, characterized in that, The first connecting seat (21) and the second connecting seat (22) are rotatably connected by a bolt and nut assembly.

10. A ladder, characterized in that, Includes a ladder frame (5) and a ladder handrail as described in any one of claims 1 to 9; A footboard (6) is installed on the inner side of the ladder frame (5), and an installation opening (51) is provided on the outer side of the ladder frame (5). The first rotating block (31) and the second rotating block (32) are located inside the installation opening (51). When the rotating rod (33) is rotated by the nut knob (34), the second rotating block (32) rotates relative to the first rotating block (31) and the outer wall of the second rotating block (32) is frictionally locked with the inner wall of the mounting port (51).

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