Pedal type extension ladder

Abstract

The utility model belongs to the technical field of ladders, and particularly relates to a treading type extension ladder. The utility model relates to a treading type extension ladder, which comprises two ladder bodies, a ladder body and a ladder body, the unfolding locking assembly is located between the two ladder bodies and comprises two connecting rods hinged to each other, and a locking mechanism for locking relative rotation of the connecting rods is arranged between the connecting rods; the telescopic locking assembly comprises a switch piece; the connecting piece is connected between the connecting rod and the switch piece; wherein a sliding groove and a rotating shaft which is arranged in the sliding groove in a sliding fit mode are arranged between the connecting rod and the ladder body, and the rotating shaft achieves rotating connection between the connecting rod and the ladder body. And the treading part is arranged on the connecting rod, after the ladder body is folded and the connecting rod is folded, the connecting rod slides downwards by treading the treading part, and the connecting piece drives the switch piece to move from the locking position to the unlocking position so as to unlock the telescopic locking assembly. The utility model has the advantages that the production cost is reduced, and meanwhile, the mistaken touch of others can be avoided.

Description

Technical Field

[0001] This utility model belongs to the field of ladder technology, and in particular relates to a step-type telescopic ladder. 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] As described in publication number CN202320740903.8, a telescopic ladder capable of rapid folding is used in A-frame ladders (typically aluminum telescopic ladders) employing telescopic rod structures. The rods of such ladders are telescopic for easy folding and storage. This patent utilizes a foot pedal linked to a telescopic locking mechanism: when the foot pedal is stepped on, the component releases the lock on the ladder rods, allowing them to extend and slide.

[0004] However, the above method has the following drawbacks: 1. Each ladder needs to be equipped with a foot pedal, resulting in higher production costs. 2. Since the function requires the operating end to be forcibly placed at the bottom of the ladder (a necessary feature of the technical solution), this position is within the reach of children, posing a risk of accidental triggering. Utility Model Content

[0005] To address the shortcomings of existing technologies, a step-operated telescopic ladder is provided that reduces production costs and prevents accidental activation by others.

[0006] This utility model is achieved using the following technical solution: a step-type telescopic ladder, comprising:

[0007] Two trapezoidal sections are arranged in a herringbone shape, and each trapezoidal section has a bamboo-joint telescopic structure.

[0008] 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.

[0009] A telescopic locking assembly, integrated within the steps of a ladder and used to lock or unlock the ladder during telescopic movement, includes a switch element comprising a locking position for locking the telescopic locking assembly and an unlocking position for unlocking the telescopic locking assembly; and

[0010] A connector that connects the link and the switch;

[0011] The connecting rod and the ladder body are provided with a sliding structure that enables the connecting rod to slide vertically after folding. The sliding structure includes a sliding groove and a rotating shaft that is slidably fitted in the sliding groove. The rotating shaft enables the connecting rod and the ladder body to rotate.

[0012] The stepping part is located on the connecting rod. When the ladder is closed and the connecting rod is folded, stepping on the stepping part causes the connecting rod to slide downward. The connecting part drives the switch to move from the locked position to the unlocked position to unlock the telescopic locking component.

[0013] When this system is in use, the two connecting rods of the locking assembly also unfold when the telescopic ladder is extended, and the two connecting rods are locked together by a locking mechanism to maintain the stability of the entire telescopic ladder. At this time, the connecting rods are arranged horizontally, so the footrests on the connecting rods are also in a high position, out of reach of children. Furthermore, due to the presence of the locking mechanism, the connecting rods will not fold, making it relatively safe.

[0014] When the telescopic ladder needs to be folded, unfold the locking component to unlock it, the telescopic ladder closes, and the two connecting rods rotate downward to achieve the folding of the connecting rods. At this time, the user can step on the foot part, causing the connecting rod to slide downward, which drives the switch to move downward through the connecting part, thereby moving the switch from the locked position to the unlocked position, thus releasing the locking state of the telescopic locking component of the ladder, and the ladder can be folded.

[0015] In some designs, when the linkage folds and rotates, the connecting piece may slightly rotate the switching element. However, this movement is insufficient to trigger the switching element to the unlocked position. Therefore, the switching element remains locked during the folding and rotating process. In some solutions, the connecting piece can be directly connected to the rotating shaft. In this case, although the shaft is within the groove during linkage rotation, its movement path is small, thus having minimal impact on the switching element. Only when the linkage is stepped on will it slide significantly downwards, triggering the switching element to the locked position.

[0016] The locking mechanism of the unfolding locking component can be any existing locking mechanism found in telescopic ladders.

[0017] The telescopic locking component can also adopt the locking structure of any existing telescopic ladder that can achieve bamboo-style ladder locking.

[0018] The foot pedal can be the outer shell of the locking mechanism that is directly stepped on, or it can be an additional protruding foot pedal on a certain link, or an additional rigid plastic rod for the user to step on, which is also relatively inexpensive.

[0019] This solution eliminates the need for an additional foot pedal at the bottom of the ladder by directly mounting the foot pedal on the connecting rod, thus saving manufacturing costs. Furthermore, mounting the foot pedal on the connecting rod keeps it out of reach of children, eliminating the risk of accidental triggering and improving safety during use.

[0020] Preferably, there are two sets of connecting rods, which are respectively arranged on opposite sides of the telescopic ladder. A crossbar is provided between the two sets of connecting rods, and the locking mechanism is provided in the crossbar, which is also used as the stepping part.

[0021] By using the crossbar as a foot pedal, the user can directly step on the crossbar to move the link downwards when it is folded. Therefore, there is no need to set up an additional foot pedal, which can further save manufacturing costs.

[0022] Preferably, the slide is provided on the connecting rod and extends along the length of the connecting rod, and the pivot is provided on the ladder body;

[0023] When the connecting rod is in the unfolded and locked state, the rotating shaft is located at the end of the slide groove near the locking mechanism.

[0024] The slide groove is set on the connecting rod, and the rotating shaft is slidably fitted in the slide groove. The rotating shaft is located at the end of the slide groove closer to the locking mechanism, so that when the connecting rod is in the unfolded state, neither of the two connecting rods can slide laterally, thereby ensuring the stability of the unfolding locking assembly.

[0025] Preferably, the end of the slide away from the locking mechanism is used to limit the extreme position of the link moving downward when it is stepped on;

[0026] When the foot pedal of the connecting rod is stepped on, the rotating shaft abuts against the end of the slide groove away from the locking mechanism, and at this time the switch is in the unlocked position under the action of the connecting member.

[0027] The end of the slide away from the locking mechanism can also limit the extreme position of the linkage when it is stepped on, thereby preventing the linkage from falling too far and causing the connecting parts to break or the switching parts to break.

[0028] Preferably, the lower end of the step of the ladder is provided with a downwardly extending connecting lug, and the rotating shaft is rotatably fixed on the connecting lug; the switch is exposed at the lower end of the step.

[0029] The connecting rod is rotatably mounted on the connecting lug via the pivot, and when the connecting rod is stepped down, the connecting member moves from the locked position to the unlocked position by pulling it down.

[0030] The above settings make the structural design more compact and simpler.

[0031] 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.

[0032] 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.

[0033] 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;

[0034] 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.

[0035] By arranging the switches of the telescopic locking components at the remaining telescopic nodes all located at the bottom of their respective pedals and using push-button switches, three-section or more telescopic ladders can be collapsed in a chain reaction simply by releasing the locking mechanism, folding the connecting rod, and stepping on the footrest. This triggers the ladder's collapse, where the upper pedal impacts the lower pedal, unlocking the locking mechanism within the upper pedal and causing the upper pedal above it to impact the upper pedal's end, thus achieving a chain reaction of collapse. Therefore, users only need to release the locking mechanism's connecting rod, fold the ladder, and step on the footrest to collapse and store the ladder, which is very convenient.

[0036] 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;

[0037] 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.

[0038] 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.

[0039] The connection between the switch and the pin can be any existing connection method that converts the rotation of the switch into axial displacement of the pin, such as a hinge.

[0040] 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.

[0041] 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.

[0042] Preferably, the connecting rod rotates downwards when folded, causing the height of the crossbar to decrease to near the ground.

[0043] The above settings are designed to make it easier for users to step on the ground.

[0044] Compared with the prior art, the beneficial effects of this utility model are: by directly setting the foot pedal on the connecting rod, there is no need to set an additional foot pedal at the bottom of the ladder, which can save manufacturing costs; at the same time, setting the foot pedal on the connecting rod can keep it away from children's reach during use, eliminating the risk of accidental triggering and improving safety during use. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the telescopic ladder when it is deployed.

[0046] Figure 2 This is a schematic diagram of the structure of the telescopic ladder when it is folded.

[0047] Figure 3 for Figure 1 Enlarged view of the circled area;

[0048] Figure 4 for Figure 2 Enlarged view of the circled area;

[0049] Figure 5 This is a schematic diagram of the telescopic ladder when it is deployed.

[0050] Figure 6 for Figure 5 Enlarged view of the circled area;

[0051] Figure 7 This is a structural diagram of the connecting parts when the telescopic ladder is unfolded after the unit rods of the ladder body are removed.

[0052] Figure 8 This is a structural diagram of the connecting parts when the telescopic ladder is folded after the unit rods of the ladder body are removed.

[0053] Figure 9 This is a structural diagram of the telescopic locking component;

[0054] Figure 10 This is a magnified comparison of the connecting rod after it has been unfolded and folded.

[0055] Reference numerals: 1. Ladder; 11. Unit rod; 2. Connecting rod; 21. First connecting rod; 211. U-shaped sleeve; 22. Second connecting rod; 23. Crossbar; 24. Slide groove; 3. Pedal; 31. Connecting ear; 32. Rotating shaft; 4. Pin; 41. Reduced diameter section; 5. Connecting part; 51. Hook hole; 6. Switching part; 61. Protruding shaft; 62. Transmission connection part. Detailed Implementation

[0056] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0057] like Figure 1 As shown, this embodiment discloses a step-type telescopic ladder, including ladder bodies 1 arranged in a herringbone 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, and adjacent unit rods 11 telescopically cooperate to form a telescopic node, which is located at the end of the unit rod 11.

[0058] The pedal 3 is fixed between the two unit rods 11 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, 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 9 As shown, the telescopic locking assembly includes a pin 4 located inside the pedal 3, the pin 4 extending along the length of the pedal 3, and the unit rod 11 having a locking hole through which the pin 4 passes. When the unit rod 11 extends, the pin 4 can pass through the locking holes of two adjacent unit rods 11 simultaneously, thereby fixing the telescopic movement of the two unit rods 11.

[0060] Each pin 4 is paired with a switch 6, which is rotatably connected to the pedal 3 via a convex shaft 61. The switch 6 has a transmission connection part 62 that is pulsatorically connected to the pin 4. The transmission connection part 62 has a U-shaped opening groove. The pin 4 has a reduced diameter section 41 that matches the U-shaped opening groove of the transmission connection part 62. The reduced diameter section 41 is smaller than the diameter of the pin 4 body to form a stepped structure. The reduced diameter section 41 engages in the U-shaped opening groove of the transmission connection part 62, and the transmission connection part 62 abuts against the stepped structures on both sides of the axial direction, so that when the switch 6 rotates, it can drive the pin 4 to move axially. A spring (not shown in the figure) is provided at the end of the pin 4. The two ends of the spring abut against the end of the pin 4 and the housing of the telescopic locking assembly or the housing inside the pedal 3, so that the spring applies a directional force to the pin 4 to move towards the unit rod 11. In some other embodiments, the spring may also be sleeved on the pin 4 to apply a directional force to the pin 4; however, in this case, a shoulder for the spring to abut against must be provided on the pin 4.

[0061] like Figure 5 and Figure 6 As 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 sets of hinged linkages 2, each set of linkages 2 being a first linkage 21 and a second linkage 22, with a crossbar 23 connecting the two sets of linkages 2. 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 link 21 has a U-shaped sleeve 211, and the second link 22 is hinged to the U-shaped sleeve 211. The U-shaped opening of the U-shaped sleeve faces upward, so when the first link 21 and the second link 22 are in the unfolded state, their rotation limits are restricted, meaning that the two links cannot continue to rotate upward. Therefore, when the first link 21 and the second link 22 are unlocked, they can only rotate downward, allowing the height of the crossbar 23 to drop close to the ground for easy stepping. 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. This locking mechanism can be a locking mechanism for the link stabilizing structure of an A-frame ladder as described in CN202411975243.7.

[0062] like Figure 1 and Figure 2As shown, in this embodiment, the switching components 6 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 6 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.

[0063] like Figures 3 to 10 As shown, the other end of the switch 6 is exposed on the lower outer side of the pedal 3, and the first connecting rod 21 and the second connecting rod 22 are respectively connected to the exposed end of the switch 6 through the connector 5. The connector 5 is C-shaped and is a rigid hook made of metal. The switch 6, the first connecting rod 21 and the second connecting rod 22 are all provided with hook holes 51 for the rigid hook to hook.

[0064] A downwardly extending 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 a sliding groove 24 extending along their length direction. The sliding groove 24 passes through the wall of the first connecting rod 21 and the second connecting rod 22. The rotating shaft 32 is rotatably fixed to the connecting ear 31, and the rotating shaft 32 passes through both the connecting ear 31 and the sliding groove 24 of the first connecting rod 21 or the second connecting rod 22, thereby realizing the rotatable connection between the first connecting rod 21 and the second connecting rod 22 and the pedal 3.

[0065] like Figure 1 , Figure 3 , Figure 7 , Figure 8 and Figure 10 As shown, when the link 2 is in the unfolded and locked state, the pivot 32 on the first link 21 and the second link 22 are both located at the end of their respective slide grooves 24 near the locking mechanism (crossbar 23), so that the entire link 2 will be blocked by the pivot whether it slides forward or backward along its length direction. Therefore, the horizontal position of the entire link 2 is fixed when it is unfolded.

[0066] In addition to its internal locking mechanism, the crossbar 23 also serves as a footrest for the user. When the connecting rod 2 is folded, the user can step down on the crossbar 23, causing the connecting rod 2 to move downwards. This causes the connecting piece 5 to pull down the switch piece 6, changing the switch piece 6 from the locked position to the unlocked position. This disengages the pin 4 from the locking hole of the unit rod 11, unlocking the telescopic locking assembly and allowing the ladder to collapse.

[0067] The end of the slide groove 24 away from the locking mechanism (crossbar 23) is used to limit the downward movement of the link 2 when it is stepped on; when the stepping part of the link 2 is stepped on, the rotating shaft 32 abuts against the end of the slide groove 24 away from the locking mechanism, and at this time the switch 6 is in the unlocked position under the action of the connecting member 5.

[0068] When the telescopic ladder is deployed, the first link 21 and the second link 22 of the deployment locking assembly also deploy, and the two links are locked together by the locking mechanism inside the crossbar 23, thereby maintaining the stability of the entire telescopic ladder. At this time, the link 2 is set horizontally, so the crossbar 23 on the link 2 is also in a high position, out of reach of children. Furthermore, due to the presence of the locking mechanism, the link 2 will not fold, making it relatively safe.

[0069] When the telescopic ladder needs to be folded, press the button on the crossbar 23 to unlock the unfolding locking component. The telescopic ladder will then close, and the first link 21 and the second link 22 will rotate downwards to fold the link. At this time, the user can step on the crossbar 23 to make the link 2 slide downwards as a whole. This will cause the switch 6 to open downwards through the connector 5, thus moving the switch 6 from the locked position to the unlocked position. This will release the locking state of the telescopic locking component of the ladder, and the ladder will begin to collapse in a chain reaction, thus completing the final folding.

[0070] Among them, the switch 6 connected to the connector 5 is a pull-type switch for unlocking.

[0071] In some other embodiments, the switch 6 connected to the connector 5 can also be a push-button switch, i.e., unlocking is achieved by pressing. This method can be achieved by changing the positions of the connector 5 and the switch 6, so that when the linkage 2 is stepped down, the downward movement of the linkage 2 can cause the connector 5 and the switch 6 to move closer to each other. At this time, the switch 6 will be pressed, thereby unlocking the telescopic locking component.

[0072] In some other embodiments, the switch 6 can also be a sliding switch, that is, the switch 6 and the pin 4 are hinged together by a connecting rod, and the axial movement of the pin 6 is achieved by the sliding of the switch 6. When the connecting rod 2 is stepped down, the downward movement of the connecting rod 2 can cause the connecting member 5 and the switch 6 to move away from each other. At this time, the switch 6 will be pulled by the connecting member 5 and slide, thereby unlocking the telescopic locking component.

Claims

1. A step-operated telescopic ladder, characterized in that, 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. as well as A connector that connects the link and the switch; The connecting rod and the ladder body are provided with a sliding structure that enables the connecting rod to slide vertically after folding. The sliding structure includes a sliding groove and a rotating shaft that is slidably fitted in the sliding groove. The rotating shaft enables the connecting rod and the ladder body to rotate. The stepping part is located on the connecting rod. When the ladder is closed and the connecting rod is folded, stepping on the stepping part causes the connecting rod to slide downward. The connecting part drives the switch to move from the locked position to the unlocked position to unlock the telescopic locking component.

2. The step-operated telescopic ladder according to claim 1, characterized in that: The number of connecting rods is two sets, and the two sets of connecting rods are respectively set on opposite sides of the telescopic ladder. A crossbar is provided between the two sets of connecting rods. The crossbar contains the locking mechanism and is used as the step part.

3. The step-operated telescopic ladder according to claim 1, characterized in that: The slide is provided on the connecting rod and extends along the length of the connecting rod, and the pivot is provided on the ladder body; When the connecting rod is in the unfolded and locked state, the rotating shaft is located at the end of the slide groove near the locking mechanism.

4. The step-operated telescopic ladder according to claim 3, characterized in that: The end of the slide away from the locking mechanism is used to limit the extreme position of the link moving downward when it is stepped on; When the foot pedal of the connecting rod is stepped on, the rotating shaft abuts against the end of the slide groove away from the locking mechanism, and at this time the switch is in the unlocked position under the action of the connecting member.

5. The step-operated telescopic ladder according to any one of claims 1 to 4, characterized in that: The lower end of the step of the ladder is provided with a downwardly extending connecting lug, and the rotating shaft is rotatably fixed on the connecting lug; the switch is exposed at the lower end of the step. The connecting rod is rotatably mounted on the connecting lug via the pivot, and when the connecting rod is stepped down, the connecting member moves from the locked position to the unlocked position by pulling it down.

6. The step-operated telescopic ladder according to any one of claims 1 to 4, 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.

7. The step-operated telescopic ladder according to any one of claims 1 to 4, characterized in that: 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.

8. The step-operated telescopic ladder 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 connecting piece, and the other end located inside the pedal and connected to the pin shaft. When the switch rotates, it drives the pin to move, causing the pin to enter or exit the lock hole, thereby enabling the telescopic locking or unlocking of two adjacent unit rods.

9. The step-operated telescopic ladder according to claim 8, 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.

10. The step-operated telescopic ladder according to claim 2, characterized in that: The link rotates downwards when folded, causing the height of the crossbar to drop to near the ground.

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