Portable universal extension ladder drive device and extension ladder

Abstract

A portable universal telescopic ladder driving device is installed on a telescopic ladder body to drive the movement of the telescopic ladder body, comprising: a foot pedal device fixedly arranged on a crossbar of the telescopic ladder body; detachable universal wheel devices arranged at four ladder corner positions at the bottom of the telescopic ladder body; a driving device arranged on one of the detachable universal wheel devices and connected to the foot pedal device through a driving rope; and a brake device arranged on another one of the detachable universal wheel devices and connected to the foot pedal device through a brake rope; wherein the foot pedal device is configured to, when stepped on, first unlock the brake device through the brake rope, and then activate the driving device through the driving rope. The present application also provides a portable universal telescopic ladder, which can effectively solve the problems of inconvenience in movement and low safety of traditional telescopic ladders, and has obvious advantages.

Description

Technical Field

[0001] This invention relates to the field of ladder technology, specifically to a portable universal telescopic ladder drive device and a telescopic ladder. Background Technology

[0002] Traditional telescopic ladders have many drawbacks in use: First, workers need to frequently climb up and down the ladder to move their positions, resulting in low efficiency and wasted manpower; second, the mechanical transmission method is difficult to adapt to changes in the height of the telescopic ladder and cannot stably transmit power when raising or lowering it; third, the braking device is rudimentary, and accidental slippage is likely to occur during movement, posing a high safety risk.

[0003] In the existing technology, although some telescopic ladders have attempted to integrate drive wheels, most of them rely on electronic devices or complex structures, which are costly, have poor versatility, and cannot be compatible with different ladder foot structures.

[0004] Therefore, it is essential to propose a portable universal telescopic ladder drive device and telescopic ladder that is simple in structure, low in cost, and highly safe to overcome the above-mentioned defects.

[0005] It is understood that the above statements only provide background information related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a portable universal telescopic ladder drive device and telescopic ladder, which enables operators to move the ladder body on the ladder through mechanical transmission, solving the problems of inconvenience and low safety of traditional telescopic ladders.

[0007] To achieve the above objectives, the present invention provides a portable universal telescopic ladder drive device, installed on the telescopic ladder body to drive its movement, comprising: a foot pedal device fixedly mounted on the crossbar of the telescopic ladder body; detachable universal wheel devices disposed at the four corner positions of the bottom of the telescopic ladder body; a drive device disposed on one of the detachable universal wheel devices and connected to the foot pedal device via a drive rope; and a braking device disposed on the other of the detachable universal wheel devices and connected to the foot pedal device via a brake rope; wherein, the foot pedal device is configured such that when stepped on, the braking device is first unlocked via the brake rope, and then the drive device is activated via the drive rope.

[0008] Preferably, the foot pedal device includes: a pedal support fixedly mounted on the crossbar; a pedal pivotally connected to the pedal support via a first pivot; a drive rope fixing end connected to the pedal via a second pivot for fixing the drive rope; and a brake rope fixing end integrally formed with the first pivot for fixing the brake rope. The pedal has a stepping end and a linkage end located on either side of the first pivot, and in the initial state, the second pivot is positioned higher than the linkage end of the pedal, with a gap between them. When the pedal is pressed, the first pivot first moves the brake rope fixing end to pull the brake rope upwards, and then the linkage end of the pedal contacts and moves the second pivot to pull the drive rope upwards.

[0009] Preferably, the detachable universal wheel device includes: a sliding rail type clamp structure, which is sleeved on the bottom foot of the telescopic ladder body and fixedly connected; a detachable upright plate, which is disposed below the sliding rail type clamp structure, including a horizontal part and two vertical parts spaced apart below the horizontal part; and a universal wheel, which is installed between the two vertical parts.

[0010] Preferably, the sliding rail clamp structure includes: a guide rail assembly having a first guide rail portion and a second guide rail portion; a first clamp slidably disposed on the first guide rail portion; a second clamp fixedly disposed on the second guide rail portion; and clamp fasteners for locking the first clamp and the second clamp to clamp the ladder foot.

[0011] Preferably, the universal wheel includes two driving wheels on one side and two driven wheels on the other side; and the two driving wheels are connected by a driving wheel shaft, the universal wheel connected to the driving device is the first driving wheel, and the universal wheel connected to the first driving wheel by the driving wheel shaft is the second driving wheel.

[0012] Preferably, the driving device includes: a ratchet, fixedly sleeved on the drive wheel shaft and disposed near the first drive wheel; the ratchet includes an internal ratchet tooth, an external gear, and an internal ratchet chain, one end of which is fixed to the external gear, and the other end of which is connected to the end of the drive rope after wrapping around the external gear once; a torsion spring device, disposed between the ratchet and the vertical portion on one side of the first drive wheel; wherein, when the drive rope is pulled up, the chain drives the ratchet to rotate forward to drive the drive wheel shaft, causing the torsion spring device to store torque; when the drive rope is released, the torsion spring device releases the torque to drive the ratchet to rotate in the opposite direction and reset.

[0013] Preferably, the torsion spring device includes: a torsion spring side plate, fixedly disposed on a vertical portion on one side of the first drive wheel; a torsion spring body, which is a spiral coil structure, including an inner end and an outer end, the inner end of which is fixedly engaged in a first torsion spring fixing groove provided on the torsion spring side plate; and a rolling sleeve, rotatably sleeved on the drive wheel shaft and located between the ratchet and the torsion spring side plate; wherein the rolling sleeve is fixedly connected to the ratchet through a keyway and can rotate synchronously with the ratchet; the rolling sleeve is also provided with a second torsion spring fixing groove, and the outer end of the torsion spring body is fixedly engaged in the second torsion spring fixing groove.

[0014] Preferably, the braking device includes: a roll limiting device, sleeved and fixed on the drive wheel shaft and disposed near the second drive wheel, which can rotate synchronously with the drive wheel shaft; a spring limiting device, fixedly disposed on the vertical part on one side of the second drive wheel and located above the roll limiting device, for limiting the rotation of the roll limiting device, including: a limiting post frame, fixed on the vertical part, having a guide inner wall inside for providing a vertical sliding track; a limiting post, slidably installed in the guide inner wall of the limiting post frame; and a return spring disposed on both sides of the limiting post, one end of which is fixed to the limiting post frame and the other end connected to the limiting post; wherein, the outer periphery of the roll limiting device has a limiting groove adapted to the shape of the lower end of the limiting post; under the action of the return spring, the lower end of the limiting post is engaged in the limiting groove to prevent the roll limiting device from rotating; and pulling the brake rope can drive the limiting post to move upward and disengage from the limiting groove to release the brake.

[0015] Preferably, the single stepping action of the foot pedal device is converted into the movement of the telescopic ladder body by the drive device, and the single movement distance is 80mm-120mm.

[0016] The present invention also provides a portable universal telescopic ladder, comprising: a telescopic ladder body, which is a multi-stage telescopic structure with multiple crossbars provided thereon; and a portable universal telescopic ladder drive device disposed on the telescopic ladder body to drive the telescopic ladder body to move.

[0017] In summary, compared with the prior art, the portable universal telescopic ladder drive device and telescopic ladder proposed in this invention have at least the following beneficial effects: (1) The portable universal telescopic ladder drive device of the present invention has high versatility. Through the detachable wheel device and flexible rope, it can be adapted to various types of telescopic ladders. (2) The portable universal telescopic ladder drive device of the present invention is easy to operate. The ladder can be driven to move by stepping on the pedal, which saves time and effort. (3) The portable universal telescopic ladder drive device of the present invention is safe and reliable. The wheels are unlocked only when the pedal is stepped on, which can effectively prevent accidental movement. (4) The portable universal telescopic ladder drive device of the present invention is inexpensive, is a purely mechanical structure, and has no expensive electronic components. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the portable universal telescopic ladder drive device installed on the telescopic ladder body in this invention; Figure 2 This is a schematic diagram of one side of the foot pedal device in this invention; Figure 3 This is a schematic diagram of the other side of the foot pedal device in this invention; Figure 4 This is a schematic diagram of the overall structure of the driving device and braking device in this invention; Figure 5 This is a schematic diagram of the detachable universal wheel device in this invention; Figure 6 This is an enlarged structural schematic diagram of the driving device in this invention; Figure 7 This is a schematic diagram of the ratchet device in the present invention; Figure 8 This is a schematic diagram of the torsion spring in this invention; Figure 9 This is an enlarged structural schematic diagram of the braking device in this invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and by providing a detailed description of a preferred embodiment.

[0020] It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions. They are only used to facilitate and clarify the purpose of illustrating the embodiments of the present invention, and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationship, or adjustments to the size should still fall within the scope of the technical content disclosed in the present invention, provided that they do not affect the effects and objectives that the present invention can produce.

[0021] It should be noted that, in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only the expressly listed elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0022] like Figure 1 As shown, the present invention provides a portable universal telescopic ladder drive device, which is installed on the telescopic ladder body 1 to drive the movement of the telescopic ladder body 1, comprising: A foot pedal device 2 is fixedly installed on the crossbar of the telescopic ladder body 1; wherein, the telescopic ladder body 1 is a multi-stage telescopic structure with multiple crossbars; and in a preferred embodiment of the present invention, the foot pedal device 2 is preferably installed on the second-to-top crossbar 11 of the telescopic ladder body 1. A detachable universal wheel device 3 is installed at the four corners of the bottom of the telescopic ladder body 1; The drive unit 4 is mounted on one of the detachable universal wheel devices 3 and is connected to the foot pedal device 2 via a drive rope 41; Braking device 5 is mounted on another of the detachable universal wheel devices 3 and is connected to the foot pedal device 2 via a brake rope 51; When the foot pedal 2 is stepped on, the braking device 5 is unlocked first, and then the driving device 4 is activated to drive the telescopic ladder body 1 to move.

[0023] Furthermore, such as Figure 2 and Figure 3 As shown, the foot pedal device 2 includes: The pedal support 21 is fixedly mounted on the secondary top crossbar 11 and is used to support the foot pedal device 2; The pedal 22 is connected to the pedal support 21 via the first pivot 221, so that the pedal 22 can pivot relative to the pedal support 21. Two rope fixing ends 23 are installed on the pedal support 21, including: The drive rope fixing end 231 is used to fix the drive rope 41, and the drive rope fixing end 231 is connected to the pedal 22 through the second rotating shaft 222; The brake rope fixing end 232 is used to fix the brake rope 51, and the brake rope fixing end 232 is integrally formed with the first rotating shaft 221; It is worth noting that the pedal 22 has a foot pedal end and a linkage end located on both sides of the first rotating shaft 221, wherein the linkage end is used to contact the second rotating shaft 222; and in the initial state, the position of the second rotating shaft 222 is higher than the linkage end of the pedal 22, and there is a gap between the two so that they do not contact each other. Specifically, when the foot pedal 22 is pressed down, causing it to rotate downwards, the first rotating shaft 221 drives the brake rope fixing end 232 to rotate, causing the brake rope fixing end 232 to move upwards first, pulling up the brake rope 51 to unlock the brake device 5. As the foot pedal 22 continues to rotate downwards, the linkage end of the foot pedal 22 contacts the second rotating shaft 222, driving the second rotating shaft 222 to rotate, which in turn drives the drive rope fixing end 231, pulling up the drive rope 41 to activate the drive device 4. It can be understood that this sequential control ensures that the telescopic ladder is always in a braking state when not in operation, only unlocking and driving sequentially when the foot pedal 22 is pressed, thus improving safety.

[0024] In a preferred embodiment of the present invention, both the drive rope 41 and the brake rope 51 are flexible ropes with excellent flexibility and adaptability.

[0025] Furthermore, such as Figure 4 As shown, the detachable universal wheel device 3 includes: The sliding rail type clamp structure 31 is sleeved on the bottom foot of the telescopic ladder body 1 and fixedly connected; A detachable upright plate 32 is disposed below the sliding rail clamp structure 31, including a horizontal part 321 and two vertical parts 322 spaced apart below the horizontal part 321; it can be understood that at this time, the bottom of the sliding rail clamp structure 31 is actually flush with the bottom of the ladder foot, the horizontal part 321 is fixed to the bottom of the sliding rail clamp structure 31 and the ladder foot, and the two vertical parts 322 are fixed below the horizontal part 321; A universal wheel 33 is installed between the two vertical parts 322 to enable the movement of the telescopic ladder body 1.

[0026] Of the four universal wheels 33, two on one side are driving wheels 331, and two on the other side are driven wheels 332. Each driving wheel 331 includes a first driving wheel 3311 and a second driving wheel 3312, connected by a driving wheel shaft 333. Each driven wheel 332 includes a first driven wheel and a second driven wheel, connected by a driven wheel shaft 334. In short, the universal wheel 33 connected to the driving device 4 is the first driving wheel 3311, and the other second driving wheel 3312 is connected to the first driving wheel 3311 via the driving wheel shaft 333.

[0027] Furthermore, such as Figure 5 As shown, the slide rail type clamp structure 31 includes: The guide rail assembly 311 includes a first guide rail part 3111 and a second guide rail part 3112 that are independent of each other, and the first guide rail part 3111 has a guide rail embedded in it. The first clamp 312 is slidably embedded in the guide rail of the first guide rail part 3111; The second clamp 313 is fixedly mounted on the second guide rail 3112; The clamp fastener 314 is disposed on one side of the first clamp 312 and is used to achieve the locking function.

[0028] It should be noted that the first clamp 312 and the second clamp 313 of the sliding rail clamp structure 31 are separate.

[0029] Specifically, during installation, the ladder feet are placed between the first clamp 312 and the second clamp 313. After the first clamp 312 is slid to lock the ladder feet together with the second clamp 313, the clamp fastener 314 is tightened to lock and fix the ladder feet. The first clamp 312 can be slid to release the ladder feet by loosening the clamp fastener 314.

[0030] Furthermore, such as Figure 6 , Figure 7 and Figure 8 As shown, the driving device 4 includes: A ratchet 42 is sleeved and fixed on the drive wheel shaft 333 and is disposed near the first drive wheel 3311; wherein, the ratchet 42 includes an internal ratchet tooth 421, an external gear 422 and an internal pawl 423; The chain 43 has its first end fixed to the external gear 422, and its second end connected to the end of the drive rope 41 after wrapping around the external gear 422 once, so that pulling up the drive rope 41 drives the chain 43 to pull up, thereby driving the ratchet 42 to rotate; it should be noted that a locking hole is provided on the horizontal part 321 of the detachable upright plate 32 corresponding to one side of the first drive wheel 3311, and the drive rope 41 passes through the locking hole and is connected to the second end of the chain 43; Torsion spring device 44, disposed between the ratchet 42 and the vertical portion 322 on one side of the first drive wheel 3311, includes: The torsion spring side plate 441 is fixedly mounted on the vertical part 322 on one side of the first drive wheel 3311 by fasteners; The torsion spring body 442 has a spiral coil structure, including an inner end 4421 and an outer end 4422. Its inner end 4421 is fixedly snapped into the first torsion spring fixing slot 4411 provided on the torsion spring side plate 441. A rolling sleeve 443 is rotatably sleeved on the drive wheel shaft 333 and located between the ratchet 42 and the torsion spring side plate 441; the rolling sleeve 443 is fixedly connected to the ratchet 42 through a keyway and can rotate synchronously with the ratchet 42; the rolling sleeve 443 is also provided with a second torsion spring fixing groove 4431, and the outer end 4422 of the torsion spring body 442 is fixedly engaged in the second torsion spring fixing groove 4431.

[0031] The working principle of the torsion spring device 44 is as follows: During the pedal 22 depress drive phase: When the pedal 22 is pressed down and the drive rope 41 is finally pulled up, the chain 43 pulls the ratchet 42 and the rolling sleeve 443 fixedly connected to it to rotate forward around the drive wheel shaft 333; at this time, the inner pawl 423 inside the ratchet 42 meshes with the inner ratchet tooth 421, transmitting torque to the drive wheel shaft 333, driving the drive wheel 331 to rotate; at the same time, the forward rotation of the rolling sleeve 443 causes the second torsion spring fixing slot 4431 to rotate accordingly, thereby causing the outer end 4422 of the torsion spring body 442 to undergo torsional deformation relative to the inner end 4421, thus storing the rotational torque; Pedal 22 release and reset phase: When pedal 22 is released, the tension of drive rope 41 disappears; at this time, the torque stored in torsion spring body 442 is released, driving rolling sleeve 443 to rotate in the opposite direction, thereby driving ratchet 42 fixed thereto to rotate in the opposite direction synchronously; and since the inner pawl 423 and inner ratchet 421 are disengaged (not engaged) when ratchet 42 rotates in the opposite direction, this reverse rotation will not be transmitted to drive wheel shaft 333, and drive wheel shaft 333 and drive wheel 331 remain stationary; at the same time, this reset action of torsion spring device 44 will drive chain 43 to wrap around the outer gear 422 of ratchet 42, thereby ensuring that the pedal 22 can be pressed down again.

[0032] Furthermore, such as Figure 9 As shown, the braking device 5 includes: The rolling limit device 52 is sleeved and fixed on the drive wheel shaft 333 and is located near the second drive wheel 3312, and can rotate synchronously with the drive wheel shaft 333. A spring limiting device 53 is fixedly installed on the vertical part 322 on one side of the second drive wheel 3312 and located above the roll limiting device 52, and is used to limit the rotation of the roll limiting device 52. Furthermore, the spring limiting device 53 includes: The limiting column frame 531 is fixed to the vertical part 322, and its interior is provided with a guide inner wall (not shown in the figure) to provide a sliding track in the vertical direction; The limiting post 532 is slidably installed in the guide inner wall of the limiting post frame 531; A reset spring 533 is disposed on both sides of the limiting post 532, one end of which is fixed to the limiting post frame 531, and the other end is connected to the limiting post 532. It should be noted that another locking hole is provided on the horizontal part 321 of the detachable upright plate 32 corresponding to one side of the first drive wheel 3311. The brake rope 51 passes through the locking hole and is fixedly connected to the upper end of the limiting post 532. The rolling limiting device 52 has a limiting groove on its outer periphery that matches the shape of the lower end of the limiting post 532. When the lower end of the limiting post 532 is inserted into the limiting groove, the rotation of the rolling limiting device 52 and the drive shaft 333 can be prevented.

[0033] Specifically, it can be understood that there is a rolling limit device 52 below the limit column frame 531, which can rotate with the drive shaft 333. Under normal conditions, the limit column 532 is always locked by the rolling limit device 52 under the action of the return spring 533, so that it is in a braking state and prevents the rolling limit device 52 and the drive shaft 333 from rotating. When the pedal 22 is pressed, the brake rope 51 is pulled up, and the brake rope 51 works before the drive rope 41. At this time, the limit column 532 moves upward along the guide inner wall of the limit column frame 531 and disengages from the limit groove. Thus, the rolling limit device 52 is unlocked, so that the telescopic ladder of the present invention is in a driveable state.

[0034] In the practical application of the present invention, it should be clarified that the drive device 4 is controlled by the pedal 2, thereby causing the telescopic ladder to move. The single movement distance is 80mm-120mm. However, it should be noted that the displacement distance generated by stepping down and lifting the pedal 22 is limited. This displacement distance is less than or equal to the length of the chain 43 around the external gear 422. Therefore, one application scenario of the telescopic ladder provided by the present invention is to make fine adjustments to the telescopic ladder. It is especially suitable for workers to make small-range movements and position adjustments during the operation of the telescopic ladder.

[0035] Of course, the present invention also has other application scenarios. Specifically, assuming that the rotation angle of the pedal 22 is 65 degrees, of which 60 degrees plays a driving role, and the pedal 22 is a lever structure that can pull the drive rope 41 for a length of 22mm; wherein, the diameter ratio of the universal wheel 33 to the ratchet 42 is 4.5, and after the stroke is amplified, the universal wheel 33 can move forward 99mm, that is, after stepping on the pedal 10 times, the telescopic ladder moves a distance of nearly 1 meter, which basically meets the needs of interior decoration and general scenarios.

[0036] The present invention also provides a portable universal telescopic ladder, comprising: a telescopic ladder body, which is a multi-stage telescopic structure with multiple crossbars provided thereon; and a portable universal telescopic ladder drive device disposed on the telescopic ladder body to drive the telescopic ladder body to move.

[0037] In summary, the portable universal telescopic ladder drive device and telescopic ladder provided by this invention have the following advantages: First, through the detachable wheel device and flexible rope, it can be adapted to various types of existing telescopic ladders, making it highly versatile; second, the ladder can be moved by stepping on the pedals, making it convenient, time-saving, and labor-saving; third, the wheels are unlocked only when the pedals are stepped on, which can effectively prevent accidental movement and ensure safety and reliability; fourth, it is a purely mechanical structure with no expensive electronic components, resulting in low cost.

[0038] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A portable universal telescopic ladder drive device, installed on the ladder body to drive its movement, characterized in that, include: A foot pedal device is fixedly installed on the crossbar of the telescopic ladder body; A detachable universal wheel device is installed at the four corners of the bottom of the telescopic ladder body; A drive unit is mounted on one of the detachable universal wheel devices and is connected to the foot pedal device via a drive rope; A braking device is mounted on one of the other detachable universal wheel devices and connected to the foot pedal device via a brake rope; The foot pedal is configured such that when stepped on, it first unlocks the braking device via the brake rope, and then activates the driving device via the drive rope.

2. The portable universal telescopic ladder drive device as described in claim 1, characterized in that, The foot pedal device includes: The pedal support is fixedly mounted on the crossbar; The pedal is pivotally connected to the pedal support via a first pivot. The fixed end of the drive rope is connected to the pedal via a second rotating shaft and is used to fix the drive rope. The brake rope fixing end is integrally formed with the first rotating shaft and is used to fix the brake rope; The pedal has a step end and a linkage end located on both sides of the first rotating shaft, and in the initial state, the position of the second rotating shaft is higher than the linkage end of the pedal, and there is a gap between the two. When the pedal is pressed, the first rotating shaft first drives the fixed end of the brake rope to move and pull the brake rope upward. Then, the linkage end of the pedal contacts and drives the second rotating shaft to move and pull the drive rope upward.

3. The portable universal telescopic ladder drive device as described in claim 2, characterized in that, The detachable universal wheel assembly includes: A sliding rail type clamp structure is fitted onto the bottom feet of the telescopic ladder body and fixedly connected. A detachable upright plate is provided below the sliding rail clamp structure, including a horizontal part and two vertical parts spaced apart below the horizontal part; A universal wheel is installed between the two vertical sections.

4. The portable universal telescopic ladder drive device as described in claim 3, characterized in that, The sliding rail type clamp structure includes: The guide rail assembly has a first guide rail section and a second guide rail section; The first clamp is slidably disposed on the first guide rail portion; The second clamp is fixedly installed on the second guide rail section; Clamping fasteners are used to lock the first clamp and the second clamp to clamp the ladder legs.

5. The portable universal telescopic ladder drive device as described in claim 3, characterized in that, The universal wheel includes two drive wheels on one side and two driven wheels on the other side; The two drive wheels are connected by a drive wheel shaft. The universal wheel connected to the drive device is the first drive wheel, and the wheel connected to the first drive wheel by the drive wheel shaft is the second drive wheel.

6. The portable universal telescopic ladder drive device as described in claim 5, characterized in that, The driving device includes: A ratchet is fixedly sleeved on the drive wheel shaft and positioned near the first drive wheel; the ratchet includes internal ratchet teeth, external gears, and internal pawls. A chain, one end of which is fixed to the external gear, and the other end of which is connected to the end of the drive rope after wrapping around the external gear once; A torsion spring device is disposed between the ratchet and the vertical portion on one side of the first drive wheel; When the drive rope is pulled up, the chain drives the ratchet to rotate in the forward direction, thereby driving the drive wheel shaft and causing the torsion spring device to store torque; when the drive rope is released, the torsion spring device releases the torque and drives the ratchet to rotate in the reverse direction to reset.

7. The portable universal telescopic ladder drive device as described in claim 6, characterized in that, The torsion spring device includes: A torsion spring side plate is fixedly mounted on the vertical part on one side of the first drive wheel; The torsion spring body has a spiral coil structure, including an inner end and an outer end, with its inner end fixedly engaged in the first torsion spring fixing slot provided on the torsion spring side plate; A rolling sleeve is rotatably fitted onto the drive wheel shaft and located between the ratchet and the torsion spring side plate; The rolling sleeve is fixedly connected to the ratchet via a keyway and can rotate synchronously with the ratchet. The rolling sleeve is also provided with a second torsion spring fixing slot, and the outer end of the torsion spring body is fixedly engaged in the second torsion spring fixing slot.

8. The portable universal telescopic ladder drive device as described in claim 5, characterized in that, The braking device includes: A rolling limit device is sleeved and fixed on the drive wheel shaft and set near the second drive wheel, and can rotate synchronously with the drive wheel shaft; A spring limiting device, fixedly mounted on a vertical portion on one side of the second drive wheel and located above the roll limiting device, is used to limit the rotation of the roll limiting device, and includes: The limiting column frame is fixed to the vertical part, and its interior is provided with a guide inner wall to provide a sliding track in the vertical direction; The limiting post is slidably installed in the guide inner wall of the limiting post frame; A reset spring is provided on both sides of the limiting post, with one end fixed to the limiting post frame and the other end connected to the limiting post. The rolling limiting device is provided with a limiting groove on its outer periphery that matches the shape of the lower end of the limiting post; Under the action of the reset spring, the lower end of the limiting post is engaged in the limiting groove to prevent the rolling limiting device from rotating; and pulling up the brake rope can drive the limiting post to move upward and disengage from the limiting groove to release the brake.

9. The portable universal telescopic ladder drive device as described in claim 1, characterized in that, The single stepping action of the foot pedal device is converted into the movement of the telescopic ladder body by the drive device, and the single movement distance is 80mm-120mm.

10. A portable universal telescopic ladder, characterized in that, include: The telescopic ladder has a multi-stage telescopic structure with multiple crossbars on it. The portable universal telescopic ladder drive device as described in any one of claims 1 to 9 is disposed on the telescopic ladder body to drive the telescopic ladder body to move.

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