Extension ladder

Abstract

The utility model provides an extension ladder, which comprises a foundation frame, a first supporting part, a second supporting part, a plurality of telescopic rods, a plurality of telescopic rods and a plurality of telescopic rods, and is characterized in that the foundation frame is provided with an opening and a sliding cavity communicated with each other; the telescopic frame is movably arranged in the sliding cavity through the opening, and a second supporting part is arranged at the bottom of the telescopic frame; the driving assembly comprises a driving structure and a driving rope, and the driving rope abuts against the first supporting part and the second supporting part; the buffer assembly is provided with a clamping part, the clamping part has a clamping state and an avoiding state which are oppositely arranged, and when the telescopic frame moves upwards, the clamping part is switched to the avoiding state; and when the telescopic frame moves downwards, the clamping part is switched to a clamping state. By means of the technical scheme, the problems that in the prior art, the falling speed of the telescopic frame is high, the speed is extremely high when the driving rope is disengaged from the hand, and if a user puts the hand (or other parts) into the telescopic ladder by misoperation, the user is extremely prone to being injured can be solved, and therefore the purpose that the telescopic ladder achieves intrinsic safety is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic ladders, in particular to a telescopic ladder. Background Art

[0002] Telescopic ladders are currently widely used in modern home life and engineering maintenance. Among them, in the prior art, the telescopic ladder includes a base frame, a telescopic frame and a driving rope. The base frame is provided with a sliding cavity, the telescopic frame is movably provided in the sliding cavity, and the driving rope can drive the telescopic frame to move in the sliding cavity. However, there is a gap between the pedal of the base frame and the telescopic frame of the existing telescopic body. During the use of the telescopic ladder, the user needs to hold the ladder frame by hand most of the time. During the process of folding the telescopic frame, the telescopic frame falls very quickly, and the driving rope is very fast when it is released from the hand. If the user mistakenly places the hand or other parts in the telescopic ladder, it is very likely to cause injuries such as pinching the hand to the user. Utility Model Content

[0003] The utility model provides a telescopic ladder to solve the problem that the telescopic frame in the prior art has a fast falling speed and the driving rope is very fast when it is released from the hand. If the user mistakenly operates and puts the hand (or other parts) in the telescopic ladder, it is very easy to cause harm to the user, so as to achieve the purpose of realizing the intrinsic safety of the telescopic ladder.

[0004] The utility model provides a telescopic ladder, which comprises: a basic frame, wherein the basic frame is provided with an opening and a sliding cavity which are interconnected, the opening is arranged at the top of the basic frame, the sliding cavity extends along the extension direction of the basic frame, and a first supporting part is arranged at the top of the basic frame; a telescopic frame, wherein the telescopic frame is movably arranged in the sliding cavity through the opening, and a second supporting part is arranged at the bottom of the telescopic frame; a driving component, wherein the driving component comprises a driving structure and a driving rope, wherein the driving structure is located at one side of the basic frame, one end of the driving rope is connected to the driving structure, the other end of the driving rope is fixed to the other side of the basic frame, and the other end of the driving rope is arranged close to the opening, the driving rope abuts against the first supporting part and the second supporting part, the driving structure can wind up or release the driving rope, and the driving structure can drive the telescopic frame to move along the extension direction of the sliding cavity through the driving rope, the first supporting part and the second supporting part; a buffer component, which is arranged on the basic frame, and the buffer component comprises a clamping part, wherein the clamping part has a clamping state and an avoidance state which are arranged relatively, and when the telescopic frame moves upward, the clamping part switches to the avoidance state; when the telescopic frame moves downward, the clamping part switches to the clamping state to buffer the falling of the telescopic frame.

[0005] Furthermore, the buffer assembly also includes: a fixed frame, fixed on the top of the base frame, and a first support part is arranged on the fixed frame; a sliding rod, movably arranged on the fixed frame, and the clamping part includes a sliding rod, when the clamping part is in an avoidance state, the minimum distance between the outer wall of the sliding rod and the outer wall of the first support part is greater than the diameter of the driving rope, and when the clamping part is in the clamping state, the minimum distance between the outer wall of the sliding rod and the outer wall of the first support part is less than the diameter of the driving rope, and the sliding rod cooperates with the first support part to apply pressure to the driving rope.

[0006] Furthermore, a slide groove is provided on the fixed frame, and the slide groove has a first end and a second end which are arranged opposite to each other. The first end of the slide groove is arranged away from the basic frame relative to the second end. Along the direction from the first end to the second end of the slide groove, the minimum spacing between the slide groove and the outer wall of the first support part gradually decreases. The sliding rod is movably arranged in the slide groove. When the sliding rod moves to the first end of the slide groove, the clamping part is in an avoidance state. When the sliding rod moves to the second end of the slide groove, the clamping part is in a clamping state. The friction between the driving rope and the sliding rod can drive the sliding rod to move in the slide groove.

[0007] Furthermore, a friction structure is provided on the sliding rod, and / or the first supporting portion, and / or the inner wall of the sliding groove.

[0008] Furthermore, the sliding rod includes: a sliding body, the sliding body is inserted into the sliding groove, and the two ends of the sliding body extend to the outside of the sliding groove respectively; a first limiting portion and a second limiting portion are respectively arranged at the two ends of the sliding body, the diameters of the first limiting portion and the second limiting portion are both larger than the diameter of the sliding body, and the first limiting portion and the second limiting portion cooperate to limit the sliding body axially, the first limiting portion and the first supporting portion are located on the same side of the fixed frame, the second limiting portion is located on the other side of the fixed frame, and the driving rope is located between the first limiting portion and the first supporting portion.

[0009] Furthermore, the inner diameter of the slide groove gradually decreases from the first end to the second end of the slide groove, the inner diameter of the first end of the slide groove is larger than the diameter of the sliding body, and the inner diameter of the second end of the slide groove is smaller than the diameter of the sliding body.

[0010] Furthermore, a limiting hole is provided on the fixing frame, the limiting hole is located below the first supporting portion, the driving rope is passed through the limiting hole, and the limiting hole can limit the position of the driving rope.

[0011] Furthermore, a shielding component is provided at the opening, and the shielding component can shield the gap between the basic frame and the telescopic frame.

[0012] Furthermore, the shielding assembly includes: a shielding plate, one end of which is swingably arranged at the opening, and the other end of the shielding plate is abutted against the telescopic frame to block the gap between the base frame and the telescopic frame; a reset member, which is arranged between the opening and the shielding plate, and the reset member can drive the shielding plate to move in a direction close to the telescopic frame.

[0013] Furthermore, a first slot and a second slot are respectively provided on both sides of the opening, the first slot and the second slot are arranged opposite to each other, an arc structure is provided on the first slot and / or the second slot, and the driving rope can be slidably provided on the first slot and the second slot.

[0014] Furthermore, reinforcing ribs are provided on the basic frame and / or the telescopic frame.

[0015] Furthermore, a protective pad is provided at the bottom of the basic frame.

[0016] By applying the technical solution of the utility model, the telescopic frame can be movably inserted into the sliding cavity of the base frame, the driving structure and the first support part are arranged on one side of the base frame, the first support part is arranged on the top of the base frame, one end of the driving rope is connected to the driving structure, the other end of the driving rope is fixedly connected to the other side of the contact frame, and the bottom of the telescopic frame is provided with a second support part, and the driving rope abuts against the first support part and the second support part. In this way, when the user winds up the driving rope, the telescopic frame can move upward to extend out of the sliding cavity, and when the user releases the driving rope, the telescopic frame can move downward to be recovered into the sliding cavity. The buffer assembly has a clamping part, and when the telescopic frame moves upward, the clamping part switches to an avoidance state, thereby avoiding clamping the driving rope, thereby allowing the telescopic frame to move normally and avoiding increasing the labor intensity of the user. When the telescopic frame moves downward, the clamping part switches to the clamping state, thereby clamping the driving rope, thereby reducing the sliding speed of the driving rope, thereby reducing the labor intensity of the user and buffering the fall of the telescopic frame, reducing the falling speed of the telescopic frame, and further reducing the kinetic energy of the telescopic frame, thereby allowing the user to have enough time to react, greatly reducing the impact on the user, avoiding the telescopic frame from causing excessive damage to the user during the falling process, and ensuring the safety of the user. At the same time, it can reduce the impact between the telescopic frame and the base frame, avoid damage to the telescopic frame and the base frame, and increase the service life of the telescopic frame and the base frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 The structure schematic diagram of the telescopic ladder provided by the utility model is shown;

[0019] Figure 2 Shows Figure 1 A partial enlarged view of the middle A;

[0020] Figure 3 Shows Figure 1 A partial enlarged view of point B in the middle;

[0021] Figure 4 The structure diagram of the buffer assembly provided by the utility model is shown;

[0022] Figure 5 A structural schematic diagram of the telescopic ladder provided by the utility model from another viewing angle is shown;

[0023] Figure 6 Shows Figure 5 A partial enlarged view of point C in the middle;

[0024] Figure 7 Shows Figure 5 A partial enlarged view of point D in the middle;

[0025] Figure 8 Shows Figure 5 A partial enlarged view of point E in the middle.

[0026] The above drawings include the following reference numerals:

[0027] 10. Basic frame;

[0028] 11, opening; 111, first slot; 112, second slot;

[0029] 12. Sliding cavity; 13. First supporting portion; 14. First longitudinal beam; 15. First transverse beam; 16. Positioning structure;

[0030] 20. Telescopic frame;

[0031] 21. second supporting portion; 22. second longitudinal beam; 23. second transverse beam;

[0032] 30. Drive components;

[0033] 31. driving structure; 32. driving rope;

[0034] 40. Buffer component;

[0035] 41. fixed frame; 411. slide slot; 412. limit hole;

[0036] 42. Sliding rod; 421. Sliding body; 422. First limiting portion;

[0037] 50. Occlusion component;

[0038] 51. shielding plate; 52. reset member; 53. connecting block;

[0039] 61. Reinforcement ribs; 62. Protection pad. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0041] like Figures 1 to 8 As shown, an embodiment of the utility model provides a telescopic ladder, which includes a base frame 10, a telescopic frame 20, a driving assembly 30 and a buffer assembly 40. The base frame 10 is provided with an opening 11 and a sliding cavity 12 that are interconnected, the opening 11 is provided at the top of the base frame 10, the sliding cavity 12 extends along the extension direction of the base frame 10, and a first support portion 13 is provided at the top of the base frame 10. The telescopic frame 20 is movably provided in the sliding cavity 12 through the opening 11, and a second support portion 21 is provided at the bottom of the telescopic frame 20. The driving assembly 30 includes a driving structure 31 and a driving rope 32. The driving structure 31 is located on one side of the base frame 10. One end of the driving rope 32 is connected to the driving structure 31. The other end of the driving rope 32 is fixed to the other side of the base frame 10. The other end of the driving rope 32 is arranged near the opening 11. The driving rope 32 abuts against the first support portion 13 and the second support portion 21. The driving structure 31 can wind or release the driving rope 32. The driving structure 31 can drive the telescopic frame 20 to move along the extension direction of the sliding cavity 12 through the driving rope 32, the first support portion 13 and the second support portion 21. The buffer assembly 40 is arranged on the base frame 10. The buffer assembly 40 has a clamping portion. The clamping portion has a clamping state and an avoidance state arranged relatively. When the telescopic frame 20 moves upward, the clamping portion switches to the avoidance state; when the telescopic frame 20 moves downward, the clamping portion switches to the clamping state to buffer the fall of the telescopic frame 20.

[0042] According to the technical solution of the present application, the telescopic frame 20 is movably arranged in the sliding cavity 12 of the base frame 10, the driving structure 31 and the first support part 13 are arranged on one side of the base frame 10, the first support part 13 is arranged on the top of the base frame 10, one end of the driving rope 32 is connected to the driving structure 31, the other end of the driving rope 32 is fixedly connected to the other side of the contact frame, and the bottom of the telescopic frame 20 is provided with a second support part 21, and the driving rope 32 abuts against the first support part 13 and the second support part 21. In this way, when the user winds up the driving rope 32, the telescopic frame 20 can move upward to extend out of the sliding cavity 12, and when the user releases the driving rope 32, the telescopic frame 20 can move downward to be recovered into the sliding cavity 12. The buffer assembly 40 has a clamping part, and when the telescopic frame 20 moves upward, the clamping part switches to an avoidance state, so as to avoid clamping the driving rope 32, thereby allowing the telescopic frame 20 to move normally and avoid increasing the labor intensity of the user. When the telescopic frame 20 moves downward, the clamping part switches to the clamping state, thereby clamping the driving rope 32, thereby reducing the sliding speed of the driving rope 32, thereby reducing the labor intensity of the user and buffering the fall of the telescopic frame 20, reducing the falling speed of the telescopic frame 20, and further reducing the kinetic energy of the telescopic frame 20, thereby allowing the user to have enough time to react, greatly reducing the impact on the user, avoiding the telescopic frame 20 from causing harm to the user during the falling process, and ensuring the safety of the user. At the same time, it can reduce the impact between the telescopic frame 20 and the base frame 10, avoid damage to the telescopic frame 20 and the base frame 10, and increase the service life of the telescopic frame 20 and the base frame 10.

[0043] In the present application, the driving structure 31 is arranged at the middle and lower part of the base frame 10, which is convenient for the user to operate. Optionally, the driving structure 31 can be a two-way self-locking hand winch or an electric winch, and the user can choose according to his own needs.

[0044] Specifically, in the present application, the first support portion 13 is a columnar structure, and the second support portion 21 is a rotating wheel.

[0045] Further, a positioning structure 16 is provided on the other side of the base frame 10, that is, the positioning structure 16 and the driving structure 31 are respectively provided on both sides of the base frame 10, the positioning structure 16 is provided close to the opening 11, and the driving rope 32 is fixedly connected to the positioning structure 16. Such a configuration facilitates the fixing of the driving rope 32.

[0046] In this application, the positioning structure 16 is a columnar structure.

[0047] Specifically, the driving rope 32 is arranged in the middle of the base frame 10 along the width direction. Such arrangement can ensure the stability of the telescopic frame 20 when the driving rope 32 drives the telescopic frame 20 to move up and down, and prevent the telescopic frame 20 from tilting.

[0048] like Figure 7 As shown, a first limiting protrusion is provided at the opening 11, and a second limiting protrusion is provided at the bottom of the telescopic frame 20. During the movement of the telescopic frame 20, the first limiting protrusion and the second limiting protrusion can abut against each other. Such a configuration can prevent the telescopic frame 20 from falling off the sliding groove, ensure the normal operation of the telescopic ladder, and prevent the user from assembling the telescopic ladder.

[0049] like Figure 2 As shown, the buffer assembly 40 also includes a fixed frame 41 and a sliding rod 42. The fixed frame 41 is fixed to the top of the base frame 10, and the first support portion 13 is arranged on the fixed frame 41. The sliding rod 42 is movably arranged on the fixed frame 41, and the clamping portion includes the sliding rod 42. When the clamping portion is in the avoidance state, the minimum distance between the outer wall of the sliding rod 42 and the outer wall of the first support portion 13 is greater than the diameter of the driving rope 32. When the clamping portion is in the clamping state, the minimum distance between the outer wall of the sliding rod 42 and the outer wall of the first support portion 13 is less than the diameter of the driving rope 32. The sliding rod 42 cooperates with the first support portion 13 to apply pressure to the driving rope 32. With such a configuration, the structure is simple and easy to operate. At the same time, the effect of the clamping portion reducing the falling speed of the telescopic frame 20 can be ensured.

[0050] Optionally, a driving member may be provided on the fixing frame 41 , and the driving member can drive the sliding rod 42 to move, and the driving member may be an electric telescopic rod.

[0051] like Figure 4 As shown, a slide groove 411 is provided on the fixed frame 41, and the slide groove 411 has a first end and a second end that are arranged oppositely. The first end of the slide groove 411 is arranged away from the base frame 10 relative to the second end. Along the direction from the first end to the second end of the slide groove 411, the minimum spacing between the slide groove 411 and the outer wall of the first support portion 13 gradually decreases. The sliding rod 42 is movably arranged in the slide groove 411. When the sliding rod 42 moves to the first end of the slide groove 411, the clamping part is in an avoidance state. When the sliding rod 42 moves to the second end of the slide groove 411, the clamping part is in a clamping state. The friction between the driving rope 32 and the sliding rod 42 can drive the sliding rod 42 to move in the slide groove 411. Such a configuration has a simple structure and is easy to operate. At the same time, the friction between the driving rope 32 and the sliding rod 42 can drive the sliding rod 42 to move, avoiding the use of an additional driving member, reducing energy consumption, and simplifying the structure of the buffer assembly 40, making it easy to process the buffer assembly 40 and reducing the difficulty of using the buffer assembly 40.

[0052] Specifically, the slide groove 411 is arranged above the first support portion 13 . Such arrangement can ensure that the slide groove 411 cooperates with the first support portion 13 to clamp the driving rope 32 normally.

[0053] The user may obtain the specific position and angle of the slide groove 411 based on multiple tests and conventional mechanical analysis, which will not be described in detail here.

[0054] Further, a friction structure is provided on the inner wall of the sliding rod 42, or the first support portion 13, or the slide groove 411. In the present application, the sliding rod 42, the first support portion 13 and the inner wall of the slide groove 411 are all provided with a friction structure. Such a configuration can increase the friction between the sliding rod 42, the first support portion 13 and the driving rope 32, so that the driving rope 32 can drive the sliding rod 42 to move in the slide groove 411. At the same time, when the sliding rod 42 moves to the second end of the slide groove 411, the clamping effect of the sliding rod 42 and the first support portion 13 on the driving rope 32 can be ensured, thereby effectively reducing the sliding speed of the driving rope 32. In addition, the friction between the slide groove 411 and the sliding rod 42 can be increased, and when the sliding rod 42 moves to the second end of the slide groove 411, the sliding rod 42 can be effectively prevented from shaking without human intervention, thereby further ensuring the clamping effect of the sliding rod 42 and the first support portion 13 on the driving rope 32.

[0055] Optionally, the friction structure in the slide groove 411 is arranged on the upper side wall of the slide groove 411. With such arrangement, when the sliding rod 42 moves to the first end of the slide groove 411, the friction structure in the slide groove 411 does not contact the structure of the sliding rod 42, thereby ensuring the normal rising of the telescopic frame 20; and when the sliding rod 42 moves to the second end of the slide groove 411, the friction structure in the slide groove 411 normally contacts the structure of the sliding rod 42, thereby effectively preventing the sliding rod 42 from sliding.

[0056] Optionally, the friction structure may be a roller pattern or a friction protrusion.

[0057] like Figure 2 As shown, the sliding rod 42 includes a sliding body 421, a first limiting portion 422, and a second limiting portion. The sliding body 421 is inserted into the slide groove 411, and both ends of the sliding body 421 extend to the outside of the slide groove 411. The first limiting portion 422 and the second limiting portion are respectively arranged at both ends of the sliding body 421. The diameters of the first limiting portion 422 and the second limiting portion are both larger than the diameter of the sliding body 421. The first limiting portion 422 and the second limiting portion cooperate to axially limit the sliding body 421. Such a configuration can effectively prevent the sliding rod 42 from shaking, thereby ensuring that the sliding rod 42 cooperates with the first support portion 13 to effectively clamp the driving rope 32.

[0058] The first limiting portion 422 and the first supporting portion 13 are located on the same side of the fixing frame 41, the second limiting portion is located on the other side of the fixing frame 41, and the driving rope 32 is located between the first limiting portion 422 and the first supporting portion 13. Such an arrangement can ensure that the sliding body 421 is in contact with the driving rope 32, thereby ensuring that the driving rope 32 can drive the sliding body 421 to move in the sliding groove 411.

[0059] Specifically, in the present application, the driving rope 32 is located in a space formed by the first limiting portion 422 , the sliding body 421 , the end surface of the fixing frame 41 and the first supporting portion 13 .

[0060] Specifically, the second limiting portion is detachably disposed on the sliding body 421. Such a configuration can adjust the clamping effect of the first limiting portion 422 on the driving rope 32 to avoid the distance between the first limiting portion 422 and the end face of the fixing frame 41 being too large or too small.

[0061] Furthermore, the inner diameter of the slide groove 411 gradually decreases from the first end to the second end of the slide groove 411, the inner diameter of the first end of the slide groove 411 is larger than the diameter of the sliding body 421, and the inner diameter of the second end of the slide groove 411 is smaller than the diameter of the sliding body 421. With such a configuration, when the sliding rod 42 moves to the first end of the slide groove 411, the sliding rod 42 can be prevented from shaking in the slide groove 411, thereby effectively ensuring the clamping effect of the sliding rod 42 and the first support portion 13 on the driving rope 32.

[0062] Furthermore, a limiting hole 412 is provided on the fixing frame 41, and the limiting hole 412 is located below the first supporting portion 13. The driving rope 32 is passed through the limiting hole 412, and the limiting hole 412 can limit the position of the driving rope 32. Such a configuration can prevent the driving rope 32 from falling off the first supporting portion 13, and ensure the normal sliding of the driving rope 32.

[0063] like Figure 6 As shown, a shielding assembly 50 is provided at the opening 11, and the shielding assembly 50 can shield the gap between the base frame 10 and the telescopic frame 20. Such a configuration can prevent the user's hand from being pinched during the process of carrying the telescopic ladder, thereby further preventing the user from being injured.

[0064] Specifically, the shielding assembly 50 includes a shielding plate 51 and a reset member 52. One end of the shielding plate 51 is swingably disposed at the opening 11, and the other end of the shielding plate 51 abuts against the telescopic frame 20 to shield the gap between the base frame 10 and the telescopic frame 20. The reset member 52 is disposed between the opening 11 and the shielding plate 51, and the reset member 52 can drive the shielding plate 51 to move toward the telescopic frame 20. If the user's hand is accidentally placed between the shielding plate 51 and the telescopic frame 20, the user can pull the hand out in time. With such a configuration, the structure is simple and easy to operate, and at the same time, it can ensure that the shielding plate 51 always blocks the gap between the base frame 10 and the telescopic frame 20 to avoid injuries during use.

[0065] Furthermore, the shielding assembly 50 further includes a connecting block 53, both ends of the base frame 10 are provided with a connecting block 53, the rotating shafts on both sides of the shielding plate 51 are rotatably provided on the two connecting blocks 53, and a reset member 52 is provided between the two connecting blocks 53 and the shielding plate 51. The reset member 52 is a torsion spring, one end of which is fixedly connected to the connecting block 53, and the other end of which is connected to the shielding plate 51.

[0066] like Figure 2 and Figure 8 As shown, the first slot 111 and the second slot 112 are respectively provided on both sides of the opening 11, the first slot 111 and the second slot 112 are arranged opposite to each other, an arc structure is provided on the first slot 111 or the second slot 112, and the driving rope 32 is slidably provided on the first slot 111 and the second slot 112. In this application, the first slot 111 and the second slot 112 are both provided with an arc structure. In this way, the first slot 111 and the second slot 112 can effectively limit the driving rope 32, so as to prevent the displacement of the driving rope 32 from affecting the normal movement of the telescopic frame 20.

[0067] Further, a reinforcing rib 61 is provided on the basic frame 10 or the telescopic frame 20. In the present application, reinforcing ribs 61 are provided on both the basic frame 10 and the telescopic frame 20. Such a configuration can improve the structural strength of the basic frame 10 and the telescopic frame 20, avoid damage to the basic frame 10 and the telescopic frame 20, and improve the service life of the telescopic ladder.

[0068] Specifically, in the present application, the base frame 10 includes two first longitudinal beams 14 , a plurality of first transverse beams 15 are disposed between the two first longitudinal beams 14 , the plurality of first transverse beams 15 are spaced apart along the extension direction of the first longitudinal beams 14 , and the reinforcing ribs 61 can be disposed between any two adjacent first transverse beams 15 .

[0069] Optionally, two reinforcing ribs 61 are arranged between two adjacent first cross beams 15 , and the two reinforcing ribs 61 are arranged crosswise. Such an arrangement can further improve the structural strength of the basic frame 10 .

[0070] Furthermore, in the present application, the telescopic frame 20 includes two second longitudinal beams 22 , a plurality of second transverse beams 23 are arranged between the two second longitudinal beams 22 , the plurality of second transverse beams 23 are spaced apart along the extension direction of the second longitudinal beams 22 , and the reinforcing ribs 61 can be arranged between any two adjacent second transverse beams 23 .

[0071] Optionally, two reinforcing ribs 61 are arranged between two adjacent second cross beams 23 , and the two reinforcing ribs 61 are arranged crosswise. Such an arrangement can further improve the structural strength of the telescopic frame 20 .

[0072] Among them, a protection pad 62 is arranged at the bottom of the basic frame 10. Such arrangement can protect the basic frame 10, prevent the basic frame 10 from being damaged, and improve the service life of the basic frame 10.

[0073] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0074] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0075] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0076] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0077] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0078] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A telescopic ladder, characterized in that: The telescopic ladder comprises: A basic frame (10), wherein the basic frame (10) is provided with an opening (11) and a sliding cavity (12) which are interconnected, wherein the opening (11) is provided at the top of the basic frame (10), the sliding cavity (12) extends along the extension direction of the basic frame (10), and a first supporting portion (13) is provided at the top of the basic frame (10); a telescopic frame (20), the telescopic frame (20) being movably arranged in the sliding cavity (12) through the opening (11), and a second supporting portion (21) being arranged at the bottom of the telescopic frame (20); A driving assembly (30), the driving assembly (30) comprising a driving structure (31) and a driving rope (32), the driving structure (31) being located on one side of the base frame (10), one end of the driving rope (32) being connected to the driving structure (31), the other end of the driving rope (32) being fixed to the other side of the base frame (10), and the other end of the driving rope (32) being arranged close to the opening (11), the driving rope (32) being in contact with the first supporting portion (13) and the second supporting portion (21), the driving structure (31) being capable of winding or releasing the driving rope (32), and the driving structure (31) being capable of driving the telescopic frame (20) to move along the extension direction of the sliding cavity (12) through the driving rope (32), the first supporting portion (13) and the second supporting portion (21); A buffer assembly (40) is arranged on the base frame (10), the buffer assembly (40) having a clamping portion, the clamping portion having a clamping state and an avoidance state arranged relatively to each other, when the telescopic frame (20) moves upward, the clamping portion switches to the avoidance state; when the telescopic frame (20) moves downward, the clamping portion switches to the clamping state, so as to buffer the falling of the telescopic frame (20).

2. The telescopic ladder according to claim 1, characterized in that: The buffer assembly (40) further comprises: A fixing frame (41) fixed on the top of the base frame (10), the fixing frame (41) being provided with the first supporting portion (13); A sliding rod (42) is movably arranged on the fixed frame (41), and the clamping part includes the sliding rod (42). When the clamping part is in the avoidance state, the minimum distance between the outer wall of the sliding rod (42) and the outer wall of the first support part (13) is greater than the diameter of the driving rope (32). When the clamping part is in the clamping state, the minimum distance between the outer wall of the sliding rod (42) and the outer wall of the first support part (13) is less than the diameter of the driving rope (32). The sliding rod (42) cooperates with the first support part (13) to apply pressure to the driving rope (32).

3. The telescopic ladder according to claim 2, characterized in that: The fixed frame (41) is provided with a slide groove (411), and the slide groove (411) has a first end and a second end arranged opposite to each other. The first end of the slide groove (411) is arranged away from the basic frame (10) relative to the second end. Along the direction from the first end to the second end of the slide groove (411), the minimum spacing between the slide groove (411) and the outer wall of the first supporting portion (13) gradually decreases. The sliding rod (42) is movably arranged in the slide groove (411). When the sliding rod (42) moves to the first end of the slide groove (411), the clamping portion is located in the avoidance state. When the sliding rod (42) moves to the second end of the slide groove (411), the clamping portion is located in the clamping state. The friction between the driving rope (32) and the sliding rod (42) can drive the sliding rod (42) to move in the slide groove (411).

4. The telescopic ladder according to claim 3, characterized in that: A friction structure is provided on the inner wall of the sliding rod (42), and / or the first supporting portion (13), and / or the sliding groove (411).

5. The telescopic ladder according to claim 3, characterized in that: The sliding rod (42) comprises: A sliding body (421), wherein the sliding body (421) is inserted into the sliding groove (411), and two ends of the sliding body (421) respectively extend to the outside of the sliding groove (411); The first limiting portion (422) and the second limiting portion are respectively arranged at two ends of the sliding body (421); the diameters of the first limiting portion (422) and the second limiting portion are both larger than the diameter of the sliding body (421); the first limiting portion (422) and the second limiting portion cooperate to axially limit the sliding body (421); the first limiting portion (422) and the first supporting portion (13) are located on the same side of the fixing frame (41), the second limiting portion is located on the other side of the fixing frame (41), and the driving rope (32) is located between the first limiting portion (422) and the first supporting portion (13).

6. The telescopic ladder according to claim 5, characterized in that: The inner diameter of the slide groove (411) gradually decreases along the direction from the first end to the second end of the slide groove (411); the inner diameter of the first end of the slide groove (411) is greater than the diameter of the sliding body (421); and the inner diameter of the second end of the slide groove (411) is smaller than the diameter of the sliding body (421).

7. The telescopic ladder according to claim 2, characterized in that: The fixing frame (41) is provided with a limiting hole (412), the limiting hole (412) is located below the first supporting portion (13), the driving rope (32) is inserted into the limiting hole (412), and the limiting hole (412) can limit the position of the driving rope (32).

8. The telescopic ladder according to claim 1, characterized in that: A shielding component (50) is provided at the opening (11), and the shielding component (50) is capable of shielding a gap between the basic frame (10) and the telescopic frame (20).

9. The telescopic ladder according to claim 8, characterized in that: The shielding component (50) comprises: a shielding plate (51), one end of the shielding plate (51) being swingably arranged at the opening (11), and the other end of the shielding plate (51) being in contact with the telescopic frame (20) so as to shield a gap between the base frame (10) and the telescopic frame (20); A reset member (52) is arranged between the opening (11) and the shielding plate (51), and the reset member (52) can drive the shielding plate (51) to move in a direction close to the telescopic frame (20).

10. The telescopic ladder according to claim 1, characterized in that: A first slot (111) and a second slot (112) are respectively arranged on both sides of the opening (11); the first slot (111) and the second slot (112) are arranged opposite to each other; an arc structure is arranged on the first slot (111) and / or the second slot (112); and the driving rope (32) can be slidably arranged on the first slot (111) and the second slot (112).

11. The telescopic ladder according to claim 1, characterized in that: The basic frame (10) and / or the telescopic frame (20) are provided with reinforcing ribs (61).

12. The telescopic ladder according to claim 1, characterized in that: A protection pad (62) is provided at the bottom of the basic frame (10).

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