A stowable and supportable ladder

Abstract

This invention provides a retractable and stably supported ladder, comprising a ladder body and two sets of support mechanisms. The ladder body includes vertical rods and climbing rods, with two vertical rods symmetrically arranged. The two ends of each climbing rod are connected to opposite sides of the two vertical rods, and multiple climbing rods are evenly spaced along the extension direction of the vertical rods. An installation cavity is formed on one side of each vertical rod. The two sets of support mechanisms are connected to the two vertical rods respectively. By designing the ladder body and the two sets of support mechanisms, the first and second support parts of the support mechanisms can be retracted into the installation cavities of the vertical rods, greatly reducing the size of the ladder, facilitating transportation and storage, and saving storage space. Simultaneously, the first and second support parts, when unfolded, form a triangular support structure, which, combined with the symmetrical arrangement of the two sets of support mechanisms, effectively improves the stability of the ladder, preventing swaying and tilting during work at heights, and enhancing safety.

Description

Technical Field

[0001] This invention relates to the field of ladder technology, and in particular to a retractable and sturdy ladder. Background Technology

[0002] Working at heights is a common operational need in scenarios such as building construction, property equipment maintenance, warehouse goods sorting, and daily household repairs. Ladders, as the most basic auxiliary tool for working at heights, are widely used in both civil and industrial fields due to their simple structure, convenient deployment, and wide applicability. Common types include straight ladders, A-frame ladders, and telescopic ladders.

[0003] With the diversification of work scenarios, users are constantly raising their requirements for the comprehensive performance of ladders. In addition to basic climbing functions, they also need to consider storage portability and work safety.

[0004] Traditional fixed ladders have a fixed structure, which makes them large in size and takes up a lot of space. They require a lot of storage and transportation space when not in use or during transportation. They are not suitable for working environments with limited space, nor are they convenient to carry on vehicles or move around flexibly.

[0005] To solve the storage problem of ladders, various folding and telescopic ladders have emerged in the existing technology, which reduce the overall volume in the storage state by means of hinged folding of rods and nested telescopic extension of tubes.

[0006] However, these retractable ladders generally suffer from insufficient support stability. Firstly, to achieve the storage function, most products simplify the lateral support structure, relying solely on the contact surface between the ladder feet and the ground for support. During climbing operations, the ladder is prone to lateral swaying, and on uneven ground or when the workers' movements are large, it is easy to tilt or even overturn, posing a significant safety hazard. Secondly, for some ladders with added lateral supports, the support components are hinged to the outside of the ladder body. After being stored, the support components still protrude outside the ladder body and cannot be completely stored inside the ladder body. The reduction in storage volume is limited, and the protruding support components are easily damaged by bumps during transportation.

[0007] Meanwhile, most existing ladders with support structures have fixed support angles and lengths, making it impossible to flexibly adjust the support shape according to the actual climbing height. This makes it difficult to form a stable triangular force-bearing support structure at different working heights, resulting in poor support adaptability.

[0008] Therefore, a retractable and sturdy ladder is proposed to solve the above problems. Summary of the Invention

[0009] To address the problems mentioned in the background art, the present invention provides a retractable and sturdy ladder, achieving convenient storage and reliable support for the ladder, thereby improving the safety and practicality of working at heights.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is: a retractable and stably supported ladder, comprising a ladder body and two sets of support mechanisms; The main body of the ladder includes vertical bars and climbing bars. There are two vertical bars arranged symmetrically. The two ends of the climbing bars are connected to the opposite side of the two vertical bars respectively. Multiple climbing bars are evenly spaced along the extension direction of the vertical bars. An installation cavity is provided on one side of the vertical rod; The two sets of support mechanisms are respectively connected to two vertical bars, and the support mechanisms include a first support part and a second support part; Both the first support and the second support are connected to the corresponding mounting cavity, and the end of the first support away from the mounting cavity is connected to the end of the second support away from the mounting cavity. Limiting parts are provided on opposite sides of the two vertical rods to limit the first support part and the second support part.

[0011] Preferably, the first support portion includes a first support rod, the top end of which is located inside the mounting cavity; A connection hole is provided at the top of the first support rod; The mounting cavity is equipped with a pin-connection adjustment assembly, and the top of the first support rod is connected to the pin-connection adjustment assembly through a connecting hole.

[0012] Preferably, the pin adjustment assembly includes a plurality of insertion holes formed on one side of the vertical rod and extending into the mounting cavity, and the insertion holes are evenly distributed along the extension direction of the vertical rod. The inner wall of the mounting cavity away from the insertion hole is provided with a plurality of first threaded grooves, and the plurality of first threaded grooves correspond to a plurality of insertion holes respectively; One of the insertion holes has a first insertion rod inserted into the inside of the connection hole, and the first insertion rod is fitted with the connection hole with a clearance. A first knob is fixed at the end of the first insert rod away from the first threaded groove, and a first threaded rod is fixed at the end of the first insert rod close to the first threaded groove. The first threaded rod is threadedly connected to the first threaded groove.

[0013] Preferably, the second support includes a hinge block, which is hinged to the bottom of the mounting cavity by a pin. A fixing rod is fixed to the end of the hinge block away from the mounting cavity, and a sleeve rod is slidably connected to the outside of the fixing rod. The front of the fixing rod is provided with a fixing component for fixing the sleeve rod.

[0014] Preferably, the fixing component includes a second threaded groove formed on one side of the fixing rod. There are multiple second threaded grooves, which are evenly distributed along the extension direction of the fixing rod. A second threaded rod extending into the second threaded groove is movably connected to the outer side of the sleeve rod. The second threaded rod is threadedly connected to the second threaded groove. A second knob is fixed at the end of the second threaded rod away from the second threaded groove.

[0015] Preferably, the top of the end of the sleeve rod away from the fixed rod is provided with a plug-in groove, and the bottom end of the first support rod is inserted into the plug-in groove.

[0016] Preferably, the limiting part includes a U-shaped plate fixed to the side of the vertical rod near the climbing pole, a movable plate slidably connected inside the U-shaped plate, and a limiting plate fixed to the side of the movable plate near the opening of the mounting cavity, the limiting plate corresponding to the opening of the mounting cavity; Preferably, a sliding rod extending into the side of the U-shaped plate away from the vertical rod is slidably connected, the sliding rod is fixedly connected to the movable plate, a spring located outside the sliding rod is fixedly provided on the side of the movable plate near the sliding rod, the other end of the spring is fixedly connected to the inside of the U-shaped plate, and a pull ring is fixedly provided on the end of the sliding rod away from the U-shaped plate.

[0017] Preferably, the limiting part further includes a guide component; The guide assembly includes guide blocks fixed to the top and bottom of the movable plate. Guide grooves are provided on the inner top and bottom walls of the U-shaped plate, and the two guide blocks are slidably connected to the inside of the two guide grooves respectively.

[0018] Another technical solution adopted in this invention is: a retractable and stably supported ladder and its method of use, comprising the following steps: S1. Release the limit: Pull the pull ring of the upper limit part of the vertical rod to drive the sliding rod to compress the spring, so that the limit plate moves away from the opening of the mounting cavity, thereby releasing the limit on the first support part and the second support part; S2. Open the support mechanism: Rotate the hinge block around the pin to rotate the fixed rod and sleeve rod out of the mounting cavity, and at the same time, remove the first support rod from the mounting cavity; S3. Adjust the first support part: Take the first support rod out of the mounting cavity, select the corresponding insertion hole according to the support height, pass the first insertion rod through the insertion hole and the connection hole, rotate the first knob to screw the first threaded rod into the first threaded groove, and fix the height of the first support rod; S4. Adjust the second support part: Adjust the length of the sliding sleeve rod so that the bottom end of the first support rod is inserted into the insertion groove, rotate the second knob to screw the second threaded rod into the second threaded groove, and fix the position of the sleeve rod; S5. Use at height: After the support mechanisms on both sides are deployed and fixed, climbing poles can be used for climbing operations; S6. Retraction and Reset: After the operation is completed, loosen the second knob and the first knob to separate the first support rod and the sleeve rod. Retract the sleeve rod to the outside of the fixed rod, pull the pull ring, and retract the first support part and the second support part into the installation cavity in sequence. Release the pull ring, and the spring will rebound to drive the limit plate to reset and limit the position, thus completing the ladder retraction.

[0019] This invention provides a retractable and stably supported ladder, with the following advantages: 1. This invention, by setting up a ladder body and two sets of support mechanisms, allows the first and second support parts of the support mechanisms to be stored inside the mounting cavity of the vertical rod, greatly reducing the volume of the ladder, facilitating transportation and storage, and saving storage space. At the same time, the first and second support parts, when unfolded, form a triangular support structure, which, together with the symmetrical arrangement of the two sets of support mechanisms, effectively improves the support stability of the ladder, avoids swaying and tilting during climbing operations, and improves the safety of use.

[0020] 2. The first support part of the present invention is connected to the vertical rod through a pin-connected adjustment assembly, and the installation height of the first support rod can be adjusted according to the actual support requirements. The sleeve of the second support part can slide along the fixed rod to adjust its length. The two work together to achieve flexible adjustment of the support height, adapt to different usage scenarios, and improve the practicality of the ladder.

[0021] 3. The present invention is equipped with a limiting part, which uses a spring to push the limiting plate to limit the support mechanism after it is stored, preventing it from falling off; pulling the pull ring can release the limiting part, making the operation convenient. At the same time, the guide component ensures that the movable plate slides smoothly, improving the reliability of the limiting part and further ensuring the safety of storing and using the ladder. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is an exploded cross-sectional view of the vertical rod and the first support portion in this invention; Figure 4 This is an exploded cross-sectional view of the vertical rod and the second support portion in this invention; Figure 5 This is a cross-sectional view of the vertical rod and the limiting part in this invention; Figure 6 This is a three-dimensional structural diagram of the limiting part in this invention; Figure 7 This is a schematic diagram of the structure of the first support part and the second support part in the stored state in this invention; Figure 8 This is a flowchart illustrating the method of using the present invention.

[0023] In the diagram: 1. Ladder body; 11. Vertical rod; 111. Mounting cavity; 12. Climbing rod; 13. Limiting part; 131. U-shaped plate; 132. Movable plate; 133. Sliding rod; 134. Spring; 135. Pull ring; 136. Guide assembly; 1361. Guide block; 1362. Guide groove; 137. Limiting plate; 2. Support mechanism; 21. First support part; 211. First support rod; 212. Connecting hole; 213. Pin-connected adjustment assembly; 2131. Insertion hole; 2132. First threaded groove; 2133. First insertion rod; 2134. First knob; 2135. First threaded rod; 22. Second support part; 221. Hinge block; 222, Sleeve rod; 223, Fixing component; 2231, Second threaded groove; 2232, Second threaded rod; 2233, Second knob; 224, Fixing rod; 225, Insertion groove. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0025] In the description of the invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, such as welding, riveting, or bonding; it can also be a detachable connection, such as threaded connection, keyed connection, or pin connection; or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example 1: like Figure 1-7 As shown, a retractable and sturdy ladder includes a ladder body 1 and two sets of support mechanisms 2.

[0028] The main body 1 of the ladder includes vertical bars 11 and climbing poles 12. There are two vertical bars 11 arranged symmetrically. The two ends of the climbing poles 12 are welded and fixed to the opposite side of the two vertical bars 11 respectively. Multiple climbing poles 12 are evenly spaced along the extension direction of the vertical bars 11. The climbing poles 12 are used for users to step on and climb. The two vertical bars 11 provide fixed support for the climbing poles 12, forming the main frame of the ladder. The climbing poles 12 are made of non-slip material to increase the friction when users step on them and prevent slipping.

[0029] A mounting cavity 111 is provided on one side of the vertical rod 11. The mounting cavity 111 is used to install the support mechanism 2, providing space for the storage and unfolding of the support mechanism 2.

[0030] The two sets of support mechanisms 2 are respectively connected to two vertical rods 11. The support mechanism 2 includes a first support part 21 and a second support part 22.

[0031] The first support portion 21 and the second support portion 22 are both connected to the corresponding mounting cavity 111. The end of the first support portion 21 away from the mounting cavity 111 is connected to the end of the second support portion 22 away from the mounting cavity 111, forming a triangular support structure to improve the stability of the support.

[0032] Limiting parts 13 are provided on opposite sides of the two vertical rods 11 to limit the first support part 21 and the second support part 22, so as to prevent the first support part 21 and the second support part 22 from unfolding after being stored, and to ensure the reliability of the storage of the support mechanism 2.

[0033] like Figure 3 As shown, in the preferred embodiment, the first support part 21 includes a first support rod 211. The top end of the first support rod 211 is located inside the mounting cavity 111. The first support rod 211 is one of the main force-bearing components of the support mechanism 2. A connecting hole 212 is provided at the top end of the first support rod 211.

[0034] The mounting cavity 111 is equipped with a pin-connection adjustment assembly 213. The top end of the first support rod 211 is connected to the pin-connection adjustment assembly 213 through the connection hole 212. The pin-connection adjustment assembly 213 not only realizes the detachable connection between the first support rod 211 and the vertical rod 11, but also adjusts the installation height of the first support rod 211 to adapt to different support scenario requirements.

[0035] The pin-connection adjustment assembly 213 includes a insertion hole 2131 opened on one side of the vertical rod 11 and extending into the mounting cavity 111. There are multiple insertion holes 2131, preferably 3-5, and they are evenly distributed along the extension direction of the vertical rod 11. The multiple insertion holes 2131 provide multiple levels for the height adjustment of the first support rod 211.

[0036] The inner wall of the mounting cavity 111 away from the insertion hole 2131 is provided with a plurality of first threaded grooves 2132, which correspond to a plurality of insertion holes 2131 respectively, and the first threaded grooves 2132 are used to cooperate with the first insertion rod 2133 to achieve fixation.

[0037] One of the insertion holes 2131 has a first insertion rod 2133 that extends into the connection hole 212. The first insertion rod 2133 and the connection hole 212 are fitted with a clearance, preferably controlled at 0.1-0.3mm. This facilitates the insertion and removal of the first insertion rod 2133, enabling the quick installation and removal of the first support rod 211, while also ensuring that the first support rod 211 can rotate around the first insertion rod 2133 through the connection hole 212 after connection.

[0038] A first knob 2134 is welded and fixed to the end of the first insert rod 2133 away from the first threaded groove 2132. The outer side of the first knob 2134 is provided with anti-slip texture. A first threaded rod 2135 is integrally formed at the end of the first insert rod 2133 near the first threaded groove 2132. The first threaded rod 2135 is threadedly connected to the first threaded groove 2132. The thread is a fine thread to improve the tightness of the connection. The first insert rod 2133 is fixed through the threaded connection, thereby fixing the first support rod 211 at a specified height and ensuring the support stability of the first support part 21.

[0039] like Figure 4 As shown, in the preferred embodiment, the second support part 22 includes a hinge block 221, which is hinged to the bottom of the mounting cavity 111 by a pin. The hinge block 221 can rotate around the pin. A fixing rod 224 is welded and fixed to the end of the hinge block 221 away from the mounting cavity 111. A sleeve rod 222 is slidably connected to the outside of the fixing rod 224. The inner wall of the sleeve rod 222 fits against the outer wall of the fixing rod 224. The sleeve rod 222 can slide along the length direction of the fixing rod 224 to realize the adjustment of the length of the second support part 22 and adapt to different support height requirements.

[0040] The front of the fixing rod 224 is provided with a fixing component 223, which is used to fix the sleeve rod 222, prevent the sleeve rod 222 from sliding during use, ensure that the length of the second support part 22 is fixed, and improve the support stability.

[0041] The fixing component 223 includes a second threaded groove 2231 formed on one side of the fixing rod 224. There are multiple second threaded grooves 2231, which are evenly distributed along the extension direction of the fixing rod 224. The outer side of the sleeve rod 222 is movably connected to a second threaded rod 2232 extending into the second threaded groove 2231. The second threaded rod 2232 is threadedly connected to the second threaded groove 2231. A second knob 2233 is welded and fixed to the end of the second threaded rod 2232 away from the second threaded groove 2231. The structure of the second knob 2233 is the same as that of the first knob 2134, which is convenient for the user to operate.

[0042] like Figure 2 As shown, in the preferred embodiment, the top of the end of the sleeve rod 222 away from the fixed rod 224 is provided with a plug groove 225. The size of the plug groove 225 is adapted to the bottom size of the first support rod 211. The bottom end of the first support rod 211 is inserted into the inside of the plug groove 225. The inner wall of the plug groove 225 is provided with a rubber pad to increase friction and improve the stability after connection.

[0043] The first support part 21 and the second support part 22 are detachably connected by plug-in fitting, which facilitates their unfolding and folding, while ensuring the stability of the connection and ensuring the reliable formation of the triangular support structure.

[0044] like Figure 5-6 As shown, in the preferred embodiment, the limiting part 13 includes a U-shaped plate 131 welded and fixed to the side of the vertical rod 11 near the climbing rod 12. A movable plate 132 is slidably connected inside the U-shaped plate 131. A limiting plate 137 is welded and fixed to the side of the movable plate 132 near the opening of the mounting cavity 111. The limiting plate 137 corresponds to the opening of the mounting cavity 111. After the first support part 21 and the second support part 22 are stored, the limiting plate 137 is used to block and limit the first support part 21 and the second support part 22 stored inside the mounting cavity 111, preventing them from falling out of the mounting cavity 111 and ensuring the limiting effect.

[0045] A sliding rod 133 extending into the side of the U-shaped plate 131 away from the vertical rod 11 is slidably connected. The sliding rod 133 is welded and fixed to the movable plate 132. A spring 134 located outside the sliding rod 133 is welded and fixed to the side of the movable plate 132 near the sliding rod 133. The other end of the spring 134 is welded and fixed to the inside of the U-shaped plate 131. When the spring 134 is in its natural state, it pushes the movable plate 132 to drive the limiting plate 137 to fit against the opening of the mounting cavity 111, thereby achieving the limiting.

[0046] A pull ring 135 is welded and fixed to the end of the sliding rod 133 away from the U-shaped plate 131. The pull ring 135 adopts a circular structure, which makes it easy for the user to pull the sliding rod 133, drive the movable plate 132 and the limiting plate 137 to move, release the limitation on the first support part 21 and the second support part 22, and facilitate the unfolding of the support mechanism 2.

[0047] like Figure 6 As shown, in the preferred embodiment, the limiting part 13 further includes a guide component 136, which guides the sliding of the movable plate 132, ensuring the smoothness of the sliding process of the movable plate 132 and preventing the movable plate 132 from deviating.

[0048] The guide assembly 136 includes guide blocks 1361 welded and fixed to the top and bottom of the movable plate 132. Guide grooves 1362 are provided on the inner top wall and inner bottom wall of the U-shaped plate 131. The size of the guide grooves 1362 is adapted to the size of the guide blocks 1361. The two guide blocks 1361 are slidably connected to the inside of the two guide grooves 1362 respectively, which restricts the sliding direction of the movable plate 132 and ensures that the movable plate 132 always slides along the installation direction of the U-shaped plate 131, thereby improving the reliability of the limiting part 13. A wear-resistant layer is provided on the outer side of the guide blocks 1361 to extend the service life.

[0049] like Figure 1 As shown, in the preferred embodiment, rubber protective pads are provided at the bottom of the vertical rod 11 and the bottom of the sleeve rod 222 to prevent the ladder from slipping during use.

[0050] In addition, a rubber buffer pad is provided on the inner side of the limiting plate 137 to avoid wear on the support mechanism 2 and improve the stability of the limiting.

[0051] Working principle: When using this retractable and sturdy ladder, first pull the pull rings 135 on both sides. The pull rings 135 drive the sliding rod 133 to slide. The sliding rod 133 drives the movable plate 132 to compress the spring 134. At the same time, the movable plate 132 drives the limiting plate 137 away from the opening of the mounting cavity 111, releasing the limitation on the support mechanism 2.

[0052] Subsequently, the first support rod 211 of the first support part 21 is removed from the mounting cavity 111. Then, according to the actual support height requirements, a suitable insertion hole 2131 is selected, the first insertion rod 2133 is disassembled, and the first insertion rod 2133 is passed through the suitable insertion hole 2131 and the connecting hole 212 at the top of the first support rod 211. The first knob 2134 is rotated to drive the first threaded rod 2135 into the corresponding first threaded groove 2132, thereby fixing the first support rod 211 at the specified height.

[0053] Then, rotate the hinge block 221 of the second support part 22 to drive the fixing rod 224 and the sleeve rod 222 out of the mounting cavity 111. Slide the sleeve rod 222 to adjust the relative length of the sleeve rod 222 and the fixing rod 224 so that the bottom end of the first support rod 211 can be inserted into the insertion groove 225 at the top of the sleeve rod 222. Then rotate the second knob 2233 to drive the second threaded rod 2232 into the second threaded groove 2231 to fix the sleeve rod 222 and the fixing rod 224. At this time, the first support part 21 and the second support part 22 form a triangular support structure.

[0054] After both support mechanisms 2 are deployed and fixed, ladders can be used for climbing operations.

[0055] After use, first turn the second knob 2233 to loosen the sleeve 222, and remove the bottom end of the first support rod 211 from the insertion slot 225. Then turn the first knob 2134 to remove the first insertion rod 2133. Install the first support rod 211 through the uppermost insertion hole 2131 and the first insertion rod 2133. Then slide the sleeve 222 to retract it to the outside of the fixed rod 224. Then pull the pull ring 135 to first store the first support rod 211 into the mounting cavity 111. Then turn the hinge block 221 to store the fixed rod 224 and the sleeve 222 into the mounting cavity 111. Finally, release the pull ring 135, the spring 134 rebounds, and pushes the movable plate 132 to drive the limiting plate 137 to fit against the opening of the mounting cavity 111, limiting the support mechanism 2 and completing the storage.

[0056] Example 2: like Figure 8 As shown, a retractable and sturdy ladder and its method of use include the following steps: S1. Release the limit: Pull the pull ring 135 of the upper limit part 13 of the vertical rod 11, drive the sliding rod 133 to compress the spring 134, so that the limit plate 137 moves away from the opening of the mounting cavity 111, and release the limit on the first support part 21 and the second support part 22. S2. Open the support mechanism 2: Rotate the hinge block 221 around the pin shaft to rotate the fixing rod 224 and the sleeve rod 222 out of the mounting cavity 111. At the same time, take out the first support rod 211 from the mounting cavity 111. S3. Adjust the first support part 21: Take the first support rod 211 out of the mounting cavity 111, select the corresponding insertion hole 2131 according to the support height, pass the first insertion rod 2133 through the insertion hole 2131 and the connection hole 212, rotate the first knob 2134 to screw the first threaded rod 2135 into the first threaded groove 2132, and fix the height of the first support rod 211; S4. Adjust the second support part 22: Adjust the length of the sliding sleeve 222 so that the bottom end of the first support rod 211 is inserted into the insertion groove 225. Rotate the second knob 2233 so that the second threaded rod 2232 is screwed into the second threaded groove 2231 and the position of the sleeve 222 is fixed. S5. Climbing Operation: After the support mechanisms 2 on both sides are unfolded and fixed, climbing operations can be carried out by climbing pole 12; S6.; Retraction and Reset: After the operation is completed, loosen the second knob 2233 and the first knob 2134 to separate the first support rod 211 and the sleeve rod 222, retract the sleeve rod 222 to the outside of the fixed rod 224, pull the pull ring 135 to retract the first support part 21 and the second support part 22 into the mounting cavity 111 in sequence, loosen the pull ring 135, and the spring 134 rebounds to drive the limit plate 137 to reset the limit, thus completing the ladder retraction.

[0057] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A retractable and sturdy ladder, characterized in that: It includes the main body of the ladder (1) and two sets of support mechanisms (2); The main body of the ladder (1) includes vertical rods (11) and climbing rods (12). There are two vertical rods (11) arranged symmetrically. The two ends of the climbing rods (12) are connected to the opposite side of the two vertical rods (11) respectively. Multiple climbing rods (12) are evenly spaced along the extension direction of the vertical rods (11). A mounting cavity (111) is provided on one side of the vertical rod (11); Two sets of support mechanisms (2) are connected to two vertical rods (11) respectively. The support mechanism (2) includes a first support part (21) and a second support part (22). The first support part (21) and the second support part (22) are both connected to the corresponding mounting cavity (111). The end of the first support part (21) away from the mounting cavity (111) is connected to the end of the second support part (22) away from the mounting cavity (111). Limiting parts (13) are provided on opposite sides of the two vertical rods (11) to limit the first support part (21) and the second support part (22).

2. The retractable and stably supported ladder according to claim 1, characterized in that: The first support part (21) includes a first support rod (211), the top end of which is located inside the mounting cavity (111); The top end of the first support rod (211) is provided with a connecting hole (212). The mounting cavity (111) is equipped with a pin-connection adjustment assembly (213), and the top end of the first support rod (211) is connected to the pin-connection adjustment assembly (213) through the connection hole (212).

3. The retractable and stably supported ladder according to claim 2, characterized in that: The pin adjustment assembly (213) includes a plug hole (2131) opened on one side of the vertical rod (11) and extending into the mounting cavity (111). There are multiple plug holes (2131) and they are evenly distributed along the extension direction of the vertical rod (11). The inner wall of the mounting cavity (111) away from the insertion hole (2131) is provided with a plurality of first threaded grooves (2132), and the plurality of first threaded grooves (2132) correspond to the plurality of insertion holes (2131) respectively; One of the insertion holes (2131) has a first insertion rod (2133) that extends into the connection hole (212), and the first insertion rod (2133) is clearance-fitted with the connection hole (212); A first knob (2134) is fixed at the end of the first insert (2133) away from the first threaded groove (2132), and a first threaded rod (2135) is fixed at the end of the first insert (2133) near the first threaded groove (2132). The first threaded rod (2135) is threadedly connected to the first threaded groove (2132).

4. The retractable and stably supported ladder according to claim 2, characterized in that: The second support part (22) includes a hinge block (221), which is hinged to the bottom of the mounting cavity (111) by a pin. A fixing rod (224) is fixed at one end of the hinge block (221) away from the mounting cavity (111), and a sleeve rod (222) is slidably connected to the outside of the fixing rod (224). The front of the fixing rod (224) is provided with a fixing component (223) for fixing the sleeve rod (222).

5. The retractable and stably supported ladder according to claim 4, characterized in that: The fixing component (223) includes a second threaded groove (2231) opened on one side of the fixing rod (224). There are multiple second threaded grooves (2231) and they are evenly distributed along the extension direction of the fixing rod (224). A second threaded rod (2232) extending into the second threaded groove (2231) is movably connected to the outside of the sleeve rod (222). The second threaded rod (2232) is threadedly connected to the second threaded groove (2231). A second knob (2233) is fixed at the end of the second threaded rod (2232) away from the second threaded groove (2231).

6. The retractable and stably supported ladder according to claim 4, characterized in that: The top of the sleeve rod (222) away from the fixed rod (224) has a plug groove (225), and the bottom end of the first support rod (211) is inserted into the plug groove (225).

7. The retractable and stably supported ladder according to claim 1, characterized in that: The limiting part (13) includes a U-shaped plate (131) fixed on the side of the vertical rod (11) near the climbing rod (12). A movable plate (132) is slidably connected inside the U-shaped plate (131). A limiting plate (137) is fixed on the side of the movable plate (132) near the opening of the mounting cavity (111). The limiting plate (137) corresponds to the opening of the mounting cavity (111).

8. The retractable and stably supported ladder according to claim 7, characterized in that: A sliding rod (133) extending into the side of the U-shaped plate (131) away from the vertical rod (11) is slidably connected. The sliding rod (133) is fixedly connected to the movable plate (132). A spring (134) located outside the sliding rod (133) is fixedly provided on the side of the movable plate (132) near the sliding rod (133). The other end of the spring (134) is fixedly connected to the inside of the U-shaped plate (131). A pull ring (135) is fixedly provided on the end of the sliding rod (133) away from the U-shaped plate (131).

9. A retractable and stably supported ladder according to claim 7, characterized in that: The limiting part (13) also includes a guide component (136); The guide assembly (136) includes guide blocks (1361) fixed to the top and bottom of the movable plate (132). The inner top wall and inner bottom wall of the U-shaped plate (131) are provided with guide grooves (1362). The two guide blocks (1361) are slidably connected to the inside of the two guide grooves (1362).

10. A method of using a retractable and stably supported ladder, as described in claims 1-9, characterized in that: Includes the following steps: S1. Release the limit: Pull the pull ring (135) of the upper limit part (13) of the vertical rod (11), drive the sliding rod (133) to compress the spring (134), so that the limit plate (137) moves away from the opening of the mounting cavity (111), and release the limit on the first support part (21) and the second support part (22); S2. Open the support mechanism (2): Rotate the hinge block (221) around the pin shaft to rotate the fixing rod (224) and the sleeve rod (222) out of the mounting cavity (111), and at the same time, take out the first support rod (211) from the mounting cavity (111); S3. Adjust the first support part (21): Take the first support rod (211) out of the mounting cavity (111), select the corresponding insertion hole (2131) according to the support height, pass the first insertion rod (2133) through the insertion hole (2131) and the connection hole (212), rotate the first knob (2134) to screw the first threaded rod (2135) into the first threaded groove (2132), and fix the height of the first support rod (211); S4. Adjust the second support part (22): Adjust the length of the sliding sleeve (222) so that the bottom end of the first support rod (211) is inserted into the insertion groove (225), rotate the second knob (2233) so that the second threaded rod (2232) is screwed into the second threaded groove (2231), and fix the position of the sleeve (222); S5. Climbing: After the support mechanisms (2) on both sides are unfolded and fixed, climbing operations are carried out by climbing poles (12); S6.; Storage and Reset: After the operation is completed, loosen the second knob (2233) and the first knob (2134), separate the first support rod (211) and the sleeve rod (222), retract the sleeve rod (222) to the outside of the fixed rod (224), pull the pull ring (135), and store the first support part (21) and the second support part (22) into the mounting cavity (111) in sequence. Loosen the pull ring (135), and the spring (134) will rebound and drive the limit plate (137) to reset the limit, thus completing the ladder storage.

Images