A collapsible ladder

Abstract

The utility model belongs to ladder technical field especially relates to a telescopic ladder of quick folding. A telescopic ladder of quick folding, include: two ladder body, unfolding locking subassembly is located between two ladder body, including two connecting rods of mutual hinging, and the other end of connecting rod respectively with corresponding ladder body rotation connection, telescopic locking subassembly, integration in the pedal of ladder body and be used for locking or unlocking of ladder body telescopic, it includes switch spare, the switch spare includes locking position and unlocking position, connecting piece, its connection between connecting rod and switch spare, the connecting end of connecting piece with connecting rod deviates the rotation axis of connecting rod and ladder body, makes connecting rod drive connecting piece to take place spatial movement through the mode of rotation with connecting rod, when the ladder body unfolds, connecting rod drives switch spare and makes switch spare be in locking position, when the ladder body gathers, connecting rod drives switch spare and makes switch spare be in unlocking position. The utility model has the advantages of saving ladder cost and being convenient for user to use.

Description

Technical Field

[0001] This utility model belongs to the field of ladder technology, and in particular relates to a telescopic ladder that can be quickly folded up. Background Technology

[0002] In existing technologies, A-frame ladders typically require two separate locking components to achieve the functions of maintaining the unfolded state and adjusting the height, respectively.

[0003] Deployment locking component: As described in publication number CN202411975243.7, a linkage stabilizing structure for an A-frame ladder is typically located in the middle part of the A-frame ladder and is used to lock the A-frame ladder in its deployed state to prevent accidental retraction.

[0004] Telescopic locking assembly: As described in publication number CN202320740903.8, this assembly is used in A-frame ladders (typically aluminum telescopic ladders) with telescopic rod structures. The rods of such ladders are telescopic for easy folding and storage. This patent utilizes a foot pedal linked to the telescopic locking mechanism: when the foot pedal is stepped on, the assembly releases the lock on the ladder rods, allowing them to telescopically slide.

[0005] However, the aforementioned deployable locking assembly and telescopic locking assembly are independent and separate devices, requiring the design and installation of two independent components on the A-frame ladder. This not only increases the material cost, manufacturing complexity, and assembly steps of the ladder, but also increases the overall structural complexity. Furthermore, users need to perform two steps when using it: first, releasing the deployable locking assembly, and second, releasing the telescopic locking assembly. Utility Model Content

[0006] To address the shortcomings of existing technologies, this solution provides a telescopic ladder that combines an unfolding locking component and a telescopic locking component, thereby saving ladder costs and facilitating user operation with quick folding.

[0007] This utility model is achieved using the following technical solution: a retractable ladder that can be quickly folded up, comprising:

[0008] Two trapezoidal sections are arranged in a herringbone shape, and each trapezoidal section has a bamboo-joint telescopic structure.

[0009] The locking assembly is located between the two ladders and includes two connecting rods that are hinged to each other. The other end of each connecting rod is rotatably connected to the corresponding ladder, and a locking mechanism is provided at the hinge point of the two to lock their relative rotation.

[0010] A telescopic locking assembly, integrated within the treads of a ladder and used to telescopically lock or unlock the ladder, includes a switch element, which includes a locking position for locking the telescopic locking assembly and an unlocking position for unlocking the telescopic locking assembly.

[0011] A connector is connected between the connecting rod and the switch. The connection end of the connector to the connecting rod is offset from the rotation axis of the connecting rod and the ladder, so that the connecting rod drives the connector to move in space by rotating.

[0012] When the ladder is unfolded, the connecting rod moves the switch to the locked position. When the ladder is closed, the connecting rod moves the switch to the unlocked position.

[0013] In use, when the user pulls the ladder upwards, it transitions from a retracted to an extended state. At this point, the ladder is closed and the connecting rod is folded, so the switch is in the unlocked position. When the user unfolds the ladder, the connecting rod changes from the folded state to the unfolded state. The rotation of the connecting rod causes the switch to move from the unlocked position to the locked position. At this point, the telescopic locking component locks the extension and retraction of the ladder, allowing the user to use the ladder.

[0014] When the user does not need to use the ladder, the user first unlocks the locking mechanism between the two links, allowing the links to fold and close from the unfolded state. Then, the two ladder bodies are closed, causing the links to rotate. The links drive the switch to move and put the switch in the unlocked position. At this time, the telescopic locking component will unlock the ladder body, and the ladder can then be retracted.

[0015] It is convenient for users to use. The telescopic locking component automatically locks when the ladder is extended and automatically unlocks when the ladder is closed, requiring only one operation. Furthermore, its structure is relatively simple, reducing material costs, manufacturing complexity, and assembly steps.

[0016] Both the unfolding locking assembly and the telescopic locking assembly can be components found in any existing telescopic ladder, such as those described in application numbers CN202411975243.7 and CN202320740903.8.

[0017] The unlocking method of the switch can be a pressing type, a pulling type, a sliding type, etc., which achieves locking or unlocking through spatial displacement.

[0018] The switching component can be a connecting rod, a metal hook, a rigid plastic hook, or other similar parts.

[0019] Preferably, the bamboo-joint telescopic structure of the ladder includes multiple telescopic nodes, the connecting rod of the unfolding locking component is rotatably connected to the ladder at the lowest telescopic node, and the connecting member is provided between the telescopic locking component and the connecting rod in the pedal located at the lowest telescopic node;

[0020] The switches of the telescopic locking components at the other telescopic nodes are all push-button switches, and they are all located at the bottom of their respective steps. When the telescopic node at the bottom of the ladder collapses, the upper step descends, causing the switch of the telescopic locking component inside the upper step to hit the end face of the lower step, thereby causing a chain collapse of the ladder.

[0021] By arranging the switches of the telescopic locking components at the remaining telescopic nodes all located at the bottom of their respective steps and using push-button switches, a three-section or more telescopic ladder can be collapsed in a chain reaction simply by releasing the locking mechanism and folding the connecting rod. This means that when the upper step falls, it impacts the end face of the lower step, unlocking the telescopic locking mechanism within the upper step, causing the upper step above it to impact the end face of the step above that, thus achieving a chain reaction of collapse. Therefore, users only need to release the locking mechanism's connecting rod and fold the ladder to achieve convenient collapse and storage.

[0022] Preferably, the pedal of the lowest telescopic node is provided with an outwardly extending connecting lug, and the connecting rod is rotatably connected to the connecting lug.

[0023] Since the switch is located on the pedal, directly connecting the connecting rod to the pedal allows the connecting rod to be closer to the switch, reducing the difficulty of installing the connector.

[0024] Preferably, the connector is a rigid hook, and both the switch and the connecting rod are provided with hook holes for the rigid hook to catch.

[0025] Rigid hooks can be made of metal or rigid plastic. They directly hook the switch and linkage, making the structure simpler, the cost lower, and the installation easier.

[0026] Preferably, the telescopic locking assembly includes a pin, which is slidably disposed within the pedal along the length direction of the pedal; the ladder is composed of multiple unit rods that are sleeved together, and each unit rod is provided with a locking hole for the pin to pass through;

[0027] The switch is rotatably fixed to the pedal, with one end exposed on the outside of the pedal and connected to the connector, and the other end located inside the pedal and connected to the pin shaft.

[0028] When the switch is rotated, it drives the pin to move, causing the pin to enter or exit the lock hole, thereby realizing the telescopic locking or telescopic unlocking of two adjacent unit rods.

[0029] The switch can be configured as a push-button switch (unlocked when pressed) or a pull-out switch (unlocked when pulled) by changing its angle position. The connection between the switch and the pin can be any existing method that converts the rotation of the switch into axial displacement of the pin, such as a hinge.

[0030] Preferably, the telescopic locking assembly further includes a spring disposed within the pedal, the spring abutting against the end of the pin or sleeved on the pin and applying a directional force to the pin to move towards the unit rod side.

[0031] By incorporating a spring that acts on the pin, causing the pin to exert a directional force toward the unit rod side, safety can be improved.

[0032] Preferably, both the switch and the connecting lug are located at the lower end of the pedal, so that the connecting rod is rotatably connected to the bottom of the pedal.

[0033] The switch connected to the connector is a push-button switch. When the ladder is closed and the connecting rod is folded, the connecting end of the connector and the connecting rod moves closer to the switch, pressing the switch to move inward toward the pedal, thereby unlocking the telescopic locking assembly; or

[0034] The switch connected to the connector is a pull-out switch. When the ladder is closed and the connecting rod is folded, the connecting end of the connector and the connecting rod moves away from the switch to pull the switch to move outward of the pedal, thereby unlocking the telescopic locking assembly.

[0035] Whether the connecting end rotates upward or downward when the connecting rod rotates depends on its specific position. For example, if the connecting end is located between the rotation axis and the center of the connecting rod, the connecting end will also rotate downward when the connecting rod rotates downward. If the rotation axis is located between the center of the connecting rod and the connecting end, the connecting end will rotate upward when the connecting rod rotates downward.

[0036] Preferably, both the switch and the connecting lug are disposed on the inner side of the pedal, so that the connecting rod is rotatably connected to the inner side of the pedal.

[0037] The switch connected to the connector is a push-button switch. When the ladder is closed and the connecting rod is folded, the connecting end of the connector and the connecting rod moves closer to the switch, pressing the switch to move inward toward the pedal, thereby unlocking the telescopic locking assembly; or

[0038] The switch connected to the connector is a pull-out switch. When the ladder is closed and the connecting rod is folded, the connecting end of the connector and the connecting rod moves away from the switch to pull the switch to move outward of the pedal, thereby unlocking the telescopic locking assembly.

[0039] Preferably, the uppermost unit rod is equipped with a handrail, the handrail is connected to the unit rod by telescopic means, and the telescopic locking component in the uppermost pedal can telescopically fix or telescopically unlock the handrail and the unit rod.

[0040] By adding handrails, users can have something to hold onto while on the ladder.

[0041] Preferably, the handrail has a grip portion located at the top of the handrail, the housing of the grip portion is fitted with a flip-up cover, the housing has an upward-opening tool slot covered by the flip-up cover, the tool slot being used to place tools.

[0042] Compared with existing technologies, the advantages of this invention are: it is more convenient for users to use the ladder; the telescopic locking component automatically locks when the ladder is extended and automatically closes when the ladder is closed, requiring only one operation. Furthermore, it is structurally simpler, reducing material costs, manufacturing complexity, and assembly steps. Attached Figure Description

[0043] Figure 1 This is a structural diagram of a telescopic ladder;

[0044] Figure 2 for Figure 1 Enlarged view of the circled area;

[0045] Figure 3 This is a structural diagram of the handrail.

[0046] Figure 4 This is a schematic diagram of the structure of Example 1, where the switch is unlocked by pulling from the bottom.

[0047] Figure 5 This is a schematic diagram of the internal pin and switch of the telescopic locking assembly in Embodiment 1;

[0048] Figure 6 This is a schematic diagram of the switch element in Example 2, which uses an inward pulling method to unlock.

[0049] Figure 7 This is a schematic diagram of the structure of the connector in Embodiment 2;

[0050] Figure 8This is a schematic diagram of the internal pin, switch, and spring of the telescopic locking assembly in Example 2;

[0051] Figure 9 This is a schematic diagram of the structure of the switch element in Example 3, which uses an inner pressing method to achieve unlocking;

[0052] Figure 10 This is a schematic diagram of the internal pin and switch of the telescopic locking assembly in Embodiment 3;

[0053] Figure 11 This is a structural diagram of the handrail.

[0054] Reference numerals: 1. Ladder body; 11. Unit rod; 12. Handrail; 121. Flip cover; 122. Housing; 123. Tool slot; 21. First connecting rod; 211. U-shaped sleeve; 22. Second connecting rod; 23. Crossbar; 24. Shaft hole; 25. Connecting shaft; 3. Pedal; 31. Connecting ear; 4. Connecting piece; 41. Connecting end; 5. Switch; 51. Transmission connection part; 52. Rotating shaft; 6. Pin; 61. Reduced diameter section; 7. Spring. Detailed Implementation

[0055] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0056] Example 1

[0057] like Figure 1 As shown, this embodiment 1 discloses a telescopic ladder that can be quickly folded, including ladder bodies 1 arranged in a V-shape, each ladder body 1 having several footboards 3 for users to step on. The ladder body 1 is a bamboo-joint telescopic structure, formed by several unit rods 11 interlocking with each other. Adjacent unit rods 11 telescopically cooperate to form a telescopic node, which is usually located at the end of the unit rod 11.

[0058] The pedal 3 is fixed between the left and right unit rods and is positioned precisely at the telescopic node. The pedal 3 integrates a telescopic locking component that locks or unlocks the unit rod 11. In this embodiment 1, the lowermost pedal 3 is not located at the end of the unit rod 11, so there is no corresponding telescopic node, and therefore, a telescopic locking component is not required within the lowermost pedal 3.

[0059] like Figure 3 and Figure 11As shown, the uppermost unit rod 11 is equipped with a handrail 12. The handrail 12 is connected to the unit rod 11 by telescopic means. The telescopic locking component in the uppermost pedal 3 secures or unlocks the handrail and unit rod 11. The handrail 12 has a gripping part located at the top of the handrail. The gripping part's housing 122 is equipped with a flip-up cover 121. The housing 122 has an upward-opening tool slot 123 covered by the flip-up cover 121. The tool slot 123 is used to store tools, such as screws, screwdrivers, pliers, and hammers.

[0060] like Figure 4 and Figure 5 As shown, the telescopic locking assembly includes a pin 6 located inside the pedal 3. The pin 6 extends along the length of the pedal 3. The unit rod 11 and the handrail 12 both have locking holes through which the pin 6 passes. When the unit rod 11 extends, the pin 6 can pass through the locking holes of two adjacent unit rods 11 or through the locking holes of the upper unit rod 11 and the handrail 12, thereby making the two unit rods 11 and the handrail 12 telescopically fixed.

[0061] Each pin 6 is paired with a switch 5, which is rotatably connected to the pedal 3 via a rotating shaft 52. The switch 5 has a transmission connection part 51 that is driven by the pin 6. The transmission connection part 51 has a U-shaped opening groove. The pin 6 has a reduced diameter section 61 that matches the U-shaped opening groove of the transmission connection part 51. The reduced diameter section 61 is smaller than the diameter of the pin 6 body to form a stepped structure. The reduced diameter section 61 engages in the U-shaped opening groove of the transmission connection part 51, and the transmission connection part 51 abuts against the stepped structures on both sides of the axial direction, so that when the switch 5 rotates, it can drive the pin 6 to move axially. A spring 7 is provided at the end of the pin 6. The two ends of the spring 7 abut against the end of the pin 6 and the wall of the telescopic locking assembly, respectively, so that the spring 7 applies a directional force to the pin 6 to move towards the unit rod 11. In some other embodiments, the spring 7 may also be sleeved on the pin 6 to apply a directional force to the pin 6; however, in this case, a shoulder for the spring 7 to abut against needs to be provided on the pin 6.

[0062] like Figures 1 to 3As shown, an unfolding locking assembly is provided between the two ladder bodies 1. The unfolding locking assembly is located at the lowest telescopic node, that is, at the second step 3 from the bottom. The unfolding locking assembly is an existing locking device, which can be referred to as a linkage stabilizing structure for an A-frame ladder described in CN202411975243.7. It mainly includes two hinged linkages, namely a first linkage 21 and a second linkage 22. The other end of each of the first linkage 21 and the second linkage 22 is rotatably connected to the corresponding ladder body 1. The end of the first linkage 21 has a U-shaped sleeve 211, and the second linkage 22 is hinged to the U-shaped sleeve 211. The U-shaped opening of the U-shaped sleeve is set upward, so that when the first linkage 21 and the second linkage 22 are in the unfolded state, the limit position of their rotation can be restricted, that is, the two linkages cannot continue to rotate upward. Therefore, when the first linkage 21 and the second linkage 22 are unlocked, the first linkage 21 and the second linkage 22 can only rotate downward. A crossbar 23 is also provided at the hinge of the first link 21 and the second link 22. The crossbar 23 is hollow and a locking mechanism is provided inside the crossbar 23 to lock the first link 21 and the second link 22. The locking mechanism can be a locking mechanism for the link stabilization structure of the A-frame ladder as described in CN202411975243.7.

[0063] like Figure 4 and Figure 5 As shown, the other end of the switch 5 is exposed on the outside of the pedal 3, and is connected to the exposed end of the switch 5 via a connector 4, which is C-shaped and is a rigid hook made of metal. The switch 5, the first link 21 and the second link 22 are all provided with hook holes for the rigid hook to catch.

[0064] A connecting ear 31 is fixedly provided at the lower end of the pedal 3. The first connecting rod 21 and the second connecting rod 22 are provided with shaft holes 24. The connecting shaft 25 passes through the connecting ear 31 and the first connecting rod 21 or the second connecting rod 22, thereby realizing the rotational connection between the first connecting rod 21 and the second connecting rod 22 and the pedal 3.

[0065] like Figure 4As shown, the switch 5 is located at the lower end of the pedal 3. This switch 5 is a pull-out switch, meaning it needs to be pulled outwards to unlock. Pulling outwards moves the switch 5 to the unlocked position, while pressing inwards moves it to the locked position. Taking the second link 22 as an example, the second link 22 is located below the pedal 3, and the switch 5 is also located below the pedal 3. The connecting end 41 (hook hole) of the connector 4, which connects to the second link 22, is offset from the rotation axis of the second link 22. This means that when the second link 22 rotates downwards, the connecting end 41 rotates downwards, moving away from the switch 5. Therefore, when the second link 22 rotates downwards and folds with the first link 21, the switch 5 is pulled downwards, causing the pin 6 to disengage from the locking hole of the unit rod 11, thus unlocking the switch. Similarly, when the ladder is extended, both the first link 21 and the second link 22 will extend, so the switch 5 will move upward to reset, causing the pin 6 to enter the locking hole of the unit rod 11, thereby completing the extension and locking of the ladder.

[0066] In this embodiment 1, since the connecting end 41 rotates downward when the second link 22 is folded, the connecting end 41 will move away from the switch member 5. In some other embodiments, if the connecting end 41 is set at the top of the second link 22 (not shown in the figure), that is, at the outer position relative to the rotation axis, then when the second link 22 rotates downward to fold, the rotation path of the connecting end 41 is upward. Therefore, the switch member 5 can also be set in a push-button switch. When the second link 22 rotates, the connecting end 41 moves upward and approaches the switch member 5, causing the connecting member 4 to press the switch member 5, thereby unlocking the telescopic locking assembly. Whether the switch member 5 is push-button or pull-out can be achieved by changing the position and angle of the switch member 5 during assembly.

[0067] like Figure 4 and Figure 5 As shown, in this embodiment, the switching components 5 of the third, fourth, and fifth pedals 3 from bottom to top are all push-button switches. That is, when the first link 21 and the second link 22 are folded, the telescopic locking component inside the second pedal 3 will be unlocked, so the unit rod 11 connected to the third pedal 3 will collapse downwards, causing the lower end of the third pedal 3 to hit the second pedal 3, triggering the push-button switch of the third pedal 3, thereby causing the unit rod 11 connected to the fourth pedal 3 to collapse downwards, and so on, thus realizing the interlocking collapse of the unit rod 11.

[0068] Example 2

[0069] like Figures 6 to 8As shown, the difference between this embodiment 2 and embodiment 1 is that the connecting ear 31 is located inside the pedal 3 and close to the bottom. When the second link 22 rotates downward, the connecting end 41 will move away from the switch 5. Therefore, the connecting part 4 can pull the switch 5 outward, thereby unlocking the telescopic locking component.

[0070] Example 3

[0071] like Figure 9 and Figure 10 As shown, the difference between Embodiment 3 and Embodiment 2 is that the connecting ear 31 is located inside the pedal 3 and near the top. The switch 5 is a push-button switch. When the second linkage 22 rotates downward, the connecting end 41 will move closer to the switch 5. Therefore, the connecting member 4 (not shown in the figure) can press the switch 5 towards the inside of the pedal 3, thereby unlocking the telescopic locking assembly.

[0072] In the three embodiments described above, due to the restriction of the U-shaped sleeve 211 between the first link 21 and the second link 22, both the first link 21 and the second link 22 rotate downwards when folding. However, the above method is not limited to downward rotation. In some other embodiments, the first link 21 and the second link 22 can also be folded simply by rotating upwards. In this case, the angle and position of the switch 5 can be adjusted accordingly, so that when the first link 21 and the second link 22 rotate upwards, the switch 5 moves to the unlocked position.

[0073] During use, the user pulls ladder 1 upwards, changing it from a retracted to an extended state. At this time, ladder 1 is closed and the connecting rods are folded, so switch 5 is in the unlocked position. When the user unfolds ladder 1, the first connecting rod 21 and the second connecting rod 22 change from a folded state to an unfolded state. The rotation of the connecting rods causes switch 5 to move from the unlocked position to the locked position. At this time, the pin 6 of the telescopic locking assembly locks the extension and retraction of ladder 1, and the user can then use the ladder.

[0074] When the user does not need to use the ladder, the user first unlocks the locking mechanism between the first link 21 and the second link 22, so that the link can be folded and closed from the unfolded state. Then, the two ladder bodies 1 are closed, causing the first link 21 and the second link 22 to rotate. The link drives the switch 5 to move and put the switch in the unlocked position. At this time, the telescopic locking component will unlock the lock on the ladder body 1, and the ladder can be retracted.

Claims

1. A rapidly collapsible extension ladder characterized by, include: Two trapezoidal sections are arranged in a herringbone shape, and each trapezoidal section has a bamboo-joint telescopic structure. The locking assembly is located between the two ladders and includes two connecting rods that are hinged to each other. The other end of each connecting rod is rotatably connected to the corresponding ladder, and a locking mechanism is provided at the hinge point of the two to lock their relative rotation. A telescopic locking assembly, integrated within the treads of a ladder and used to telescopically lock or unlock the ladder, includes a switch element, which includes a locking position for locking the telescopic locking assembly and an unlocking position for unlocking the telescopic locking assembly. A connector is connected between the connecting rod and the switch. The connection end of the connector to the connecting rod is offset from the rotation axis of the connecting rod and the ladder, so that the connecting rod drives the connector to move in space by rotating. When the ladder is unfolded, the connecting rod moves the switch to the locked position. When the ladder is closed, the connecting rod moves the switch to the unlocked position.

2. The quickly foldable extension ladder of claim 1, wherein: The bamboo-joint telescopic structure of the ladder includes multiple telescopic nodes. The connecting rod of the unfolding locking component is rotatably connected to the ladder at the lowest telescopic node. The connecting member is provided between the telescopic locking component and the connecting rod inside the pedal at the lowest telescopic node. The switches of the telescopic locking components at the other telescopic nodes are all push-button switches, and they are all located at the bottom of their respective steps. When the telescopic node at the bottom of the ladder collapses, the upper step descends, causing the switch of the telescopic locking component inside the upper step to hit the end face of the lower step, thereby causing a chain collapse of the ladder.

3. The telescopic ladder that can be quickly folded up according to claim 2, characterized in that: The pedal of the lowest telescopic node is provided with an outwardly extending connecting lug, and the connecting rod is rotatably connected to the connecting lug.

4. The retractable ladder that can be quickly folded up according to claim 1, characterized in that: The connector is a rigid hook, and both the switch and the connecting rod are provided with hook holes for the rigid hook to catch.

5. The retractable ladder that can be quickly folded up according to any one of claims 1 to 4, characterized in that: The telescopic locking assembly includes a pin, which is slidably disposed inside the pedal along the length direction of the pedal; the ladder is composed of multiple unit rods that are sleeved together, and each unit rod is provided with a locking hole for the pin to pass through; The switch is rotatably fixed to the pedal, with one end exposed on the outside of the pedal and connected to the connector, and the other end located inside the pedal and connected to the pin shaft. When the switch is rotated, it drives the pin to move, causing the pin to enter or exit the lock hole, thereby realizing the telescopic locking or telescopic unlocking of two adjacent unit rods.

6. The retractable ladder that can be quickly folded up according to claim 5, characterized in that: The telescopic locking assembly also includes a spring disposed within the pedal, the spring abutting against the end of the pin or sleeved on the pin and applying a directional force to the pin to move towards the unit rod side.

7. The retractable ladder that can be quickly folded up according to claim 3, characterized in that: Both the switch and the connecting lug are located at the lower end of the pedal, so that the connecting rod is rotatably connected to the bottom of the pedal. The switch connected to the connector is a push-button switch. When the ladder is closed and the connecting rod is folded, the connecting end of the connector and the connecting rod moves closer to the switch, pressing the switch to move inward toward the pedal, thereby unlocking the telescopic locking assembly; or The switch connected to the connector is a pull-out switch. When the ladder is closed and the connecting rod is folded, the connecting end of the connector and the connecting rod moves away from the switch to pull the switch to move outward of the pedal, thereby unlocking the telescopic locking assembly.

8. The telescopic ladder that can be quickly folded up according to claim 3, characterized in that: Both the switch and the connecting lug are located on the inner side of the pedal, so that the connecting rod is rotatably connected to the inner side of the pedal. The switch connected to the connector is a push-button switch. When the ladder is closed and the connecting rod is folded, the connecting end of the connector and the connecting rod moves closer to the switch, pressing the switch to move inward toward the pedal, thereby unlocking the telescopic locking assembly; or The switch connected to the connector is a pull-out switch. When the ladder is closed and the connecting rod is folded, the connecting end of the connector and the connecting rod moves away from the switch to pull the switch to move outward of the pedal, thereby unlocking the telescopic locking assembly.

9. The telescopic ladder that can be quickly folded up according to claim 5, characterized in that: The uppermost unit rod is equipped with a handrail, and the handrail is connected to the unit rod by telescopic means. The telescopic locking component inside the uppermost pedal can telescopically fix or telescopically unlock the handrail and the unit rod.

10. The retractable ladder that can be quickly folded up according to claim 9, characterized in that: The handrail has a grip portion located at the top of the handrail, and the housing of the grip portion is fitted with a flip-up cover. The housing has an upward-opening tool slot covered by the flip-up cover, and the tool slot is used to place tools.

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