Stabilizing device of telescopic straight ladder

Abstract

The invention relates to the technical field of telescopic ladders, in particular to a stabilizing device of a telescopic straight ladder, which comprises supports, pedals and locking pins, the two supports are jointly sleeved with the pedals, the locking pins are respectively arranged at the joints of the pedals and the two supports, non-slip mats are arranged at the lower ends of the two supports of the pedal ladder section at the lowermost end, and the pedal ladder section at the lowermost end is connected with the locking pins through the non-slip mats. The top of each of the two supports of the pedal ladder section at the uppermost end is provided with an anti-skid sleeve, the telescopic vertical ladder further comprises a stabilizing device, the stabilizing device is connected to the top of the pedal at the top, and when the telescopic vertical ladder leans against, the stabilizing device adapts to the shape of a leaning surface to stabilize the telescopic vertical ladder. One side of the stabilizing device is changed, so that the stabilizing device is further adaptive to the shape of the leaning surface, and the aim of stabilizing the telescopic vertical ladder is fulfilled.

Description

Technical Field

[0001] This invention relates to the field of telescopic ladder technology, specifically a stabilizing device for a telescopic straight ladder. Background Technology

[0002] Telescopic ladders are a type of bamboo telescopic ladder. They can be folded and retracted for easy storage and are ideal for high-altitude operations in departments such as power and telecommunications, urban construction, public security and fire protection, heating and gas supply, and landscaping. They are also commonly used as climbing ladders for various emergency repair vehicles, line inspection vehicles, command vehicles, and other vehicles during field operations.

[0003] The working principle of a telescopic ladder is to first extend the telescopic ladders together to a suitable height, then lock the telescopic ladders, and lean the top of the telescopic ladders against a wall or other support. At this time, people can work through the telescopic ladders.

[0004] While telescopic ladders can help people climb and work, in areas with many obstacles, such as urban villages, there are often obstacles that are difficult to move that block the front of the ladder. This forces the ladder to be used against irregular surfaces such as the side or an angle. For example, at a corner, the ladder needs to be leaned against the corner during work. However, when the ladder is placed at a corner, there are few available points of support, which may result in only half of the ladder being supported at the corner, while the other half is suspended in the air. During the climb, the ladder may sway, making it unstable and posing a risk of falling.

[0005] To address the problem of instability and even the risk of falling when leaning against irregular surfaces, a stabilizing device for a telescopic ladder is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a stabilizing device for a telescopic ladder, which solves the problem of instability when the telescopic ladder is leaning against a surface with many obstructions. By setting a variable stabilizing device, the telescopic ladder can adapt to the shape of the leaning surface, thereby achieving the purpose of stabilizing the telescopic ladder.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A stabilizing device for a telescopic ladder includes brackets, steps, and locking pins. A step is fitted onto two of the brackets, and locking pins are provided at the connection points between the step and each of the two brackets. Anti-slip pads are installed at the lower ends of the two brackets of the lowest step section, and anti-slip pads are installed at the top of the two brackets of the uppermost step section. The device also includes a stabilizing mechanism connected to the top of the top step. When the telescopic ladder is leaned against, the stabilizing mechanism adapts to the shape of the leaning surface to stabilize the telescopic ladder.

[0009] In the above scheme, the stabilizing device can change the adaptable support surface when leaning against it, thereby enhancing the stability during operation. The stability is further enhanced by setting anti-slip pads.

[0010] Preferably, the stabilizing device includes a support frame installed on the top step of the telescopic ladder. The lower end of the support frame has a mounting groove that mates with the step. The support frame is fitted onto the top step of the telescopic ladder through the mounting groove. A placement groove is provided on the side of the support frame away from the locking pin. Multiple stabilizing rods for stabilizing and conforming to the support surface are provided in the placement groove and are connected by support springs. The multiple stabilizing rods are in contact with each other. The support frame is provided with a fixing component for fixing the multiple stabilizing rods in the placement groove.

[0011] In the above scheme, the setting of multiple stabilizer bars improves the adaptability to different shapes of the support surface. The stabilizer bars are connected by support springs. When the stabilizer bars are under force, the support springs can be contracted, and the shape of the stabilizer bars will change, which improves the adaptability. At the same time, after the stabilizer bars are separated from the support surface, the support springs can easily drive the stabilizer bars to return to their original position.

[0012] Preferably, the fixing component includes an extrusion member disposed on one side of the placement groove and in contact with the stabilizing rod. The support frame is threadedly connected to a threaded rod on the side near the extrusion member, and one end of the threaded rod is in contact with the extrusion member. A steel wire is wound on the threaded rod. A motor is installed in the bracket at the bottom of the telescopic ladder. An overrunning clutch is sleeved on the output shaft of the motor. The steel wire passes through multiple brackets and extends to the bottom of the telescopic ladder and is fixed to the overrunning clutch. A button is provided at the bottom of the telescopic ladder, and the button is electrically connected to the motor.

[0013] In the above scheme, the threaded rod in the threaded hole is rotated by the steel wire, which in turn drives the extrusion component in the placement groove to extrude multiple stabilizing rods, increasing the friction between the stabilizing rods. This friction between the stabilizing rods is greater than the elastic force of the support spring, thus fixing the multiple stabilizing rods in place. As a result, the shape of the multiple stabilizing rods on the support frame that fits against the wall is fixed, reducing the probability of deformation of the stabilizing rods due to shaking and increasing the stability of the telescopic ladder.

[0014] Preferably, each of the stabilizer bars is connected to a plurality of horizontally adjacent stabilizer bars via a connector, the connector including but not limited to a limiting spring or elastic rubber, and each of the stabilizer bars is engaged with a limiting spring between itself and a plurality of horizontally adjacent stabilizer bars.

[0015] In the above solution, when multiple stabilizer bars are pressed and fixed to the wall by the extrusion components, the wall will provide outward support force to the multiple stabilizer bars in the vertical direction of the wall, while the multiple stabilizer bars will be subjected to lateral shear force in the outward direction. Each stabilizer bar is connected by a connector. When multiple stabilizer bars are subjected to force, the adjacent multiple stabilizer bars can share the shear force through the connector, thereby achieving the purpose of providing reverse support force to offset the shear force, reducing the probability of damage to the stabilizer bars due to shear force, and improving the stability of the stabilizer bars when providing support.

[0016] Preferably, each of the limiting springs is a conical helical spring, and a first stabilizing hole is provided on one side of the stabilizing rod, and a second stabilizing hole is provided on the other side of the stabilizing rod. Both the first stabilizing hole and the second stabilizing hole are cylindrical. The diameter of the first stabilizing hole is smaller than the diameter of the second stabilizing hole. The inner wall of the first stabilizing hole is connected to the smaller end of the first stabilizing hole, and the inner wall of the second stabilizing hole is connected to the larger end of the second stabilizing hole.

[0017] In the above solution, by setting a limiting spring, when the stabilizer bar leans against the support surface and generates lateral stress, the limiting spring connected to the two stabilizer bars will be compressed, thereby reducing the lateral stress between the stabilizer bars and improving the service life of the stabilizer bars. At the same time, by setting a first stabilizing hole and a second stabilizing hole, the two ends of the first stabilizing hole and the second stabilizing hole are respectively connected to the large and small ends of the limiting spring, which helps to improve the locking of the position of the limiting spring.

[0018] Preferably, each of the support springs has a connecting plate near one end of the stabilizer bar, and each connecting plate is threadedly connected to the corresponding stabilizer bar. The support frame includes a support plate, a cover plate, and a slot. The support plate is connected to the top of the top pedal. The placement slot is opened at the bottom of the support plate, and the placement slot is opened at the top of the support plate. The top of the support plate is connected to the cover plate by screws. A slot is opened on one side of both the support plate and the cover plate, and the slot is arc-shaped. The shape of the multiple unloaded stabilizer bars is similar to the shape of the slot.

[0019] In the above solution, the support plate is fitted with a cover plate via threads, and each support spring has a connecting plate welded to one end near the stabilizer bar. Each connecting plate is threadedly connected to the corresponding stabilizer bar, improving the convenience of replacing the stabilizer bar. When the stabilizer bar is damaged, it can be disassembled and repaired via threads, extending the overall service life of the structure. When the wall is irregular, an arc notch is made in the support frame. By aligning the arc notch with the more protruding part of the wall, multiple stabilizer bars can better fit the wall. On some arc-shaped walls and surfaces to lean against, the arc notch can basically fit and conform, improving the convenience of regular use.

[0020] Preferably, the extrusion component includes an extrusion block, a limiting surface, a transition section, and a clearance surface. The extrusion block is connected to one side of the placement groove. The extrusion block has a limiting surface on its rear side near the stabilizer rod, a transition section in the middle of its side near the stabilizer rod, and a clearance surface on its front side near the stabilizer rod. The limiting surface is straight and fits against the stabilizer rod. The transition section is arc-shaped. The clearance surface is inclined and gradually moves away from the support spring from the connection point with the transition section.

[0021] In the above solution, by setting a limiting surface, the limiting surface and the contact surface of the stabilizing rod are completely in contact, which increases the force-bearing area. At the same time, when the extrusion block moves in parallel, the arc-shaped transition section and the inclined avoidance surface can avoid contact with the support spring, thereby improving the life of the support spring during use.

[0022] Preferably, each stabilizer bar head is provided with a friction pad to increase friction. The friction pad is made of rubber material, and the side of the friction pad away from the stabilizer bar is provided with a contact surface. The contact surface is at an angle of 105° with the horizontal plane.

[0023] In the above solution, the friction pad can increase the friction between multiple stabilizer bars and the wall, improve the stability of multiple stabilizer bars when supported by the wall, increase the friction coefficient between each stabilizer bar and the wall, thereby reducing the occurrence of relative sliding between the stabilizer bars and the wall, and improving the stability when each stabilizer bar is in contact with the wall. At the same time, the angle between the contact surface and the horizontal plane is 105°, which is more suitable for the safe angle of 75° when the telescopic ladder is placed during operation. When the telescopic ladder is placed at 75°, the contact area between the contact surface and the support surface is large, thereby improving stability.

[0024] Preferably, each of the stabilizer bars is made of a highly wear-resistant metal material, the stabilizer bars are rectangular, the length of the multiple stabilizer bars is the same, the length of the support spring in the middle is shorter, and the length of the support springs on both sides gradually increases.

[0025] In the above solution, multiple stabilizer bars need to be subjected to friction and compression against the wall multiple times during use. Each stabilizer bar is made of a highly wear-resistant metal material, such as high manganese steel ZGMn13, which can extend the service life of the stabilizer bar and thus extend the service life of the support frame. At the same time, the middle support spring is shorter and the side support springs are longer, which can better adapt to the shape changes of the slot and improve stability.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. The present invention discloses a stabilizing device for a telescopic ladder. Multiple stabilizing rods on the top support frame of the telescopic ladder contact and press against the wall. Support springs on these rods are compressed by the wall. Through the cooperation of the support springs and stabilizing rods, a certain supporting force is provided between the stabilizing rods and the wall, improving stability during climbing. Furthermore, in conjunction with the pressing component and threaded rod, after climbing to the top of the telescopic ladder, rotating the threaded rod causes the pressing component to compress the multiple stabilizing rods, increasing the friction between them. This friction is greater than the elastic force of the support springs, fixing the multiple stabilizing rods in place. Thus, the shape formed by the multiple stabilizing rods on the support frame conforming to the wall is fixed. Since the telescopic ladder cannot remain stationary throughout operation, this device reduces the probability of deformation of the stabilizing rods due to swaying, increasing the stability of the telescopic ladder.

[0028] 2. The stabilizing device for a telescopic ladder described in this invention addresses the issue that, due to varying wall pressure, the extended lengths of the stabilizing rods differ. Consequently, some stabilizing rods may fail to provide opposing support forces to adjacent stabilizing rods to counteract shear forces. By connecting each stabilizing rod with connectors (including but not limited to limiting springs or elastic rubber), the shear forces can be shared among adjacent stabilizing rods under stress, thereby achieving mutual opposing support forces to counteract the shear forces. This reduces the likelihood of damage to the stabilizing rods due to shear forces and improves the stability of the stabilizing rods during support.

[0029] 3. The stabilizing device for a telescopic ladder described in this invention is configured such that each limiting spring is a conical helical spring. The conical helical spring is a non-linear characteristic spring. When the deformation force is small, the spring deformation can avoid contact with surrounding parts. Increasing the limiting spring to completely offset the squeezing force given by the wall can reduce the impact of vibration on the stabilizing rod and improve the stability of the stabilizing rod during use. Attached Figure Description

[0030] Figure 1 This is a perspective view of the present invention;

[0031] Figure 2 This is a schematic diagram of the support frame portion of the present invention;

[0032] Figure 3 This is a top partial cross-sectional view of the support frame of the present invention;

[0033] Figure 4 For the present invention Figure 1 Schematic diagram of cross-section at CC;

[0034] Figure 5 For the present invention Figure 3 Enlarged view of point B;

[0035] Figure 6 For the present invention Figure 1 Enlarged view of point A;

[0036] Figure 7 This is a schematic diagram of the three-dimensional structure of the stabilizer bar of the present invention;

[0037] Figure 8 This is a schematic diagram of the state where the present invention is leaning against a corner surface;

[0038] Figure 9 This is a schematic diagram of the state of the present invention leaning against the arc-shaped surface;

[0039] Figure 10 This is a load-deformation relationship diagram of the limiting spring of the present invention.

[0040] In the diagram: 1. Bracket; 2. Pedal; 3. Locking pin; 4. Support frame; 401. Support plate; 402. Cover plate; 403. Groove; 5. Placement groove; 6. Support spring; 7. Stabilizer bar; 701. First stabilizing hole; 702. Second stabilizing hole; 8. Extrusion part; 801. Extrusion block; 802. Limiting surface; 803. Transition section; 804. Clearance surface; 9. Placement groove; 10. Threaded rod; 11. Limiting spring; 12. Connecting plate; 13. Steel wire; 14. Friction pad; 141. Contact surface; 15. Motor; 16. Overrunning clutch; 17. Button; 18. Anti-slip pad; 19. Anti-slip sleeve. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0042] Please see Figures 1 to 10 This invention provides a stabilizing device for a telescopic ladder, the technical solution of which is as follows:

[0043] Please refer to the details. Figure 1 , Figure 2 and Figure 3A stabilizing device for a telescopic ladder includes a bracket 1, a step 2, and locking pins 3. The step 2 is mounted on two brackets 1. Locking pins 3 are provided at the connection points between the step 2 and the two brackets 1. Anti-slip pads 18 are installed at the lower ends of the two brackets 1 of the lowest step section, and anti-slip sleeves 19 are installed at the top of the two brackets 1 of the uppermost step section. The device also includes a stabilizing mechanism connected to the top of the top step 2. When the telescopic ladder is leaned against, the stabilizing mechanism adapts to the shape of the leaning surface to stabilize the telescopic ladder. The stabilizing mechanism includes a support frame 4 mounted on the top step 2 of the telescopic ladder. The lower end of the support frame 4 has a mounting groove 9 that mates with the step 2. The support frame 4 is fitted onto the top step of the telescopic ladder through the mounting groove 9. On the support frame 4, a placement groove 5 is provided on the side away from the locking pin 3. The support frame 4 includes a support plate 401, a cover plate 402 and a groove 403. The support plate 401 is connected to the top of the top pedal 2. The placement groove 9 is provided at the bottom of the support plate 401 and the placement groove 5 is provided at the top of the support plate 401. The top of the support plate 401 is connected to the cover plate 402 by screws. A groove 403 is provided on one side of both the support plate 401 and the cover plate 402. The groove 403 is arc-shaped. The shape of the multiple unloaded stabilizing rods 7 is similar to the shape of the groove 403. Multiple stabilizing rods 7 connected by support springs 6 are provided in the placement groove 5 for stabilizing and fitting against the support surface. The multiple stabilizing rods 7 fit together with each other.

[0044] By setting up pedals 2, the operator pulls multiple pedals 2 in sequence, and then fixes two adjacent pedals 2 with locking pins 3 until the telescopic ladder is pulled out to the required height. The pedals 2 at the top of the telescopic ladder lean against the corner of the wall. Multiple stabilizing rods 7 on the top support frame 4 of the telescopic ladder contact and press against the wall. The support springs 6 on the multiple stabilizing rods 7 are compressed under the action of the wall, so that the shape formed by the multiple stabilizing rods 7 fits the shape of the wall, thereby improving stability. The anti-slip pads 18 at the bottom of the telescopic ladder support the bottom surface, and the anti-slip sleeves 19 at the top support the wall or the object it leans against, effectively improving stability. The stabilizing device at the top of the telescopic ladder allows the telescopic ladder to lean stably against irregular objects.

[0045] As one embodiment of the present invention, refer to Figure 3 , Figure 5 and Figure 7Each stabilizer bar 7 is connected to multiple horizontally adjacent stabilizer bars 7 via connectors. Each stabilizer bar 7 is engaged with multiple horizontally adjacent stabilizer bars 7 by a limiting spring 11. Each limiting spring 11 is a conical helical spring. A first stabilizing hole 701 is provided on one side of the stabilizer bar 7, and a second stabilizing hole 702 is provided on the other side of the stabilizer bar 7. Both the first stabilizing hole 701 and the second stabilizing hole 702 are cylindrical. The diameter of the first stabilizing hole 701 is smaller than the diameter of the second stabilizing hole 702. The inner wall of the first stabilizing hole 701 is connected to the smaller end of the limiting spring 11, and the inner wall of the second stabilizing hole 702 is connected to the larger end of the limiting spring 11. Each support spring 6 has a connecting plate 12 near one end of the stabilizer bar 7, and each connecting plate 12 is threadedly connected to the corresponding stabilizer bar 7.

[0046] By setting limit springs 11, all of which are conical helical springs, which are non-linear characteristic springs, when the deformation force is small, the spring deformation can avoid contact with surrounding parts. Increasing the limit springs 11 to counteract the squeezing force given by the wall can reduce the impact of vibration on the stabilizer bar 7 and improve the stability of the stabilizer bar 7 during use.

[0047] As one embodiment of the present invention, refer to Figure 2 , Figure 3 , Figure 4 and Figure 6 The support frame 4 is equipped with a fixing assembly for fixing multiple stabilizing rods 7 in the placement slot 5. The fixing assembly includes an extrusion member 8 disposed in the placement slot 5 and attached to one side of the stabilizing rod 7. The extrusion member 8 includes an extrusion block 801, a limiting surface 802, a transition section 803, and a clearance surface 804. The extrusion block 801 is connected to one side of the placement slot 5. The limiting surface 802 is provided on the rear side of the extrusion block 801 near the stabilizing rod 7. The transition section 803 is provided in the middle of the extrusion block 801 near the stabilizing rod 7. The clearance surface 804 is provided on the front side of the extrusion block 801 near the stabilizing rod 7. The limiting surface 802 is straight and flush with the stabilizing rod. 7. The transition section 803 is arc-shaped, and the avoidance surface 804 is inclined. The avoidance surface 804 gradually moves away from the support spring 6 from the connection with the transition section 803. The support frame 4 is threadedly connected to the threaded rod 10 on the side near the extrusion part 8, and one end of the threaded rod 10 is in contact with the extrusion part 8. The threaded rod 10 is wound with steel wire 13. The bottom bracket 1 of the telescopic ladder is equipped with a motor 15. The output shaft of the motor 15 is fitted with an overrunning clutch 16. The steel wire 13 passes through multiple brackets 1 and extends to the bottom of the telescopic ladder and is fixed to the overrunning clutch 16. A button 17 is provided on the bottom of the telescopic ladder. The button 17 is electrically connected to the motor 15.

[0048] It should be noted that the overrunning clutch 16 consists of an inner plate and an outer ring. The inner plate is keyed to the output shaft of the motor. Multiple slots are provided on the inner plate, and a steel column is connected to each slot by a spring.

[0049] By setting up motor 15, when the operator pulls the telescopic ladder to extend multiple steps to the required height and secures them with locking pins 3, the top step 2 of the telescopic ladder is then leaned against the corner of the wall. Multiple stabilizing rods 7 on the top support frame 4 of the telescopic ladder contact and press against the wall. The support springs 6 on the stabilizing rods 7 are compressed under the action of the wall, causing the shape formed by the stabilizing rods 7 to conform to the shape of the wall. Then, the operator presses button 17 at the bottom of the telescopic ladder. Button 17 sends an electrical signal to motor 15, causing motor 15 to rotate and drive the overrunning clutch 16. If button 17 is not pressed during the process of the operator extending the multiple steps, motor 15 will not start, and the multiple steel columns will not have centrifugal force and will not contact the outer ring. Therefore, as the multiple steps are extended, the steel wire 13 on the outer ring is continuously stretched. Once the multiple steps have been extended to the required height... The top of the telescopic ladder is placed against the support surface, and then button 17 is pressed. Button 17 sends an electrical signal to motor 15, which rotates and drives overrunning clutch 16. When motor 15 rotates, it drives the inner plate to rotate counterclockwise. Due to centrifugal force, the spring extends, and the steel column in the slot contacts the outer ring. Due to friction, the outer ring rotates counterclockwise, which in turn drives steel wire 13 to retract. Through steel wire 13, the threaded rod 10 in the threaded hole rotates, which in turn drives the extrusion piece 8 in the placement slot 5 to press multiple stabilizing rods 7. The limiting surface 802 is tightly attached to the stabilizing rods 7, which increases the friction between the multiple stabilizing rods 7. This makes the friction between the stabilizing rods 7 greater than the elastic force of the support spring 6, thus fixing the multiple stabilizing rods 7 in place. This fixes the shape of the multiple stabilizing rods 7 on the support frame 4 that fits against the wall, reducing the probability of deformation of the stabilizing rods 7 due to shaking and increasing the stability of the telescopic ladder.

[0050] As one embodiment of the present invention, refer to Figure 2 and Figure 3 Each stabilizer bar 7 has a friction pad 14 at its head to increase friction. The friction pad 14 is made of rubber. The friction pad 14 has a contact surface 141 on the side away from the stabilizer bar 7. The contact surface 141 has an angle of 105° with the horizontal plane. Each stabilizer bar 7 is made of high wear-resistant metal. The stabilizer bar 7 is rectangular. The length of multiple stabilizer bars 7 is the same. The length of the middle support spring 6 is relatively short, and the length of the support springs 6 on both sides gradually increases.

[0051] By setting a friction pad 14, which is made of rubber, and the angle between the contact surface 141 of the friction pad 14 and the horizontal plane is 105°, the contact surface 141 and the support surface are well attached when the telescopic ladder reaches the optimal safety angle. This not only reminds the operator of the support angle and assists the operator in safe operation, but also increases the contact area 141 with the support surface, thereby increasing the friction.

[0052] When the operator carries the telescopic ladder to the work location, they pull the ladder to extend multiple steps 2 sequentially to the required height. Next, they secure adjacent steps with locking pins 3 until the ladder reaches the desired height. During this process, one end of the steel wire 13 wraps around the threaded rod 10, causing the wire 13 to lengthen along with the extended steps. The operator then leans the ladder, now secured at the height with locking pins 3, against the wall where the work is to be done. They adjust the angle of the ladder so that the angle between the ladder and the horizontal plane is approximately 75°. Simultaneously, multiple stabilizing rods 7 within the top support frame 4 of the ladder are engaged. When pressed against the wall, the supporting spring 6 contracts. The shape of the multiple stabilizing rods 7 is similar to that of the wall and fits against it. The friction pad 14 also fits against the wall. At the same time, the contact area between the contact surface 141 and the support surface is large, which improves stability. The operator presses button 17 and holds it for 5-10 seconds. Button 17 sends an electrical signal to motor 15, which starts. The output shaft of motor 15 drives the overrunning clutch 16 to rotate. When motor 15 rotates, it drives steel wire 13 to contract. The other end of steel wire 13 is connected to threaded rod 10. Steel wire 13 then drives threaded rod 10 to rotate into placement groove 5. Threaded rod 10 then drives the extrusion piece 8 in placement groove 5 to move inward. Multiple stabilizing rods 7 are compressed, and the limiting surface 802 fits tightly against the stabilizing rods 7, thereby increasing the friction between the multiple stabilizing rods 7. At this time, the multiple stabilizing rods 7, which have changed to fit the wall shape, are fixed in place, increasing the contact area between the support frame 4 and the wall. Then, the operator begins to climb the telescopic ladder to carry out the work. During the operation, the threaded rod 10 rotates into the placement groove 5 through the steel wire 13. Due to the self-locking property of the thread, it always remains in a compressed state. During the operator's operation, there may be shaking or swaying when climbing up and down the ladder to retrieve tools. When the multiple stabilizing rods 7 are compressed and fixed by the extrusion part 8 and fit against the wall, the wall will provide multiple stabilizing forces. The fixed rod 7 provides outward support along the vertical direction of the wall, while the multiple stabilizing rods 7 are subjected to lateral shear force in the direction of extension. When the telescopic rod sways, the limiting springs 11 on the multiple stabilizing rods 7 reduce the shear force on the stabilizing rods 7, thereby reducing rigid impact. After the operator finishes the work, he moves down to the ground and retracts the multiple step stair sections in sequence through the locking pin 3. When each step stair section is retracted, the button 17 is pressed, the drive motor 15 starts and drives the overrunning clutch 16 to rotate, which in turn drives the outer ring to rotate and retract the steel wire 13, preventing the steel wire 13 from getting tangled in the bracket 1. The operator then repeats the above operation to retract the multiple step stair sections in sequence.After all the steps are fully retracted, the operator manually loosens the threaded rod 10. Multiple stabilizing rods 7 spring out and return to their initial state under the action of multiple support springs 6. The operator then manually tightens the threaded rod 10, securing the stabilizing rods 7 with the clamping component 8, and then retracts the telescopic ladder. This prevents the stabilizing rods 7 from being compressed during transportation or storage, which could lead to malfunctions during subsequent use. Before using the telescopic ladder again, the threaded rod 10 is manually loosened before extending the steps.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stabilizing device for a telescopic ladder, comprising a bracket (1), a step (2), and a locking pin (3), wherein a step (2) is commonly fitted onto two of the brackets (1), and a locking pin (3) is provided at the connection between the step (2) and the two brackets (1), and anti-slip pads (18) are installed at the lower ends of the two brackets (1) of the lowest step section, and anti-slip sleeves (19) are installed at the top of the two brackets (1) of the uppermost step section; characterized in that, It also includes a stabilizing device connected to the top of the top footplate (2), which stabilizes the telescopic ladder when it is leaned against the surface.

2. The stabilizing device for a telescopic ladder according to claim 1, characterized in that: The stabilizing device includes a support frame (4) installed on the top step (2) of the telescopic ladder. The lower end of the support frame (4) is provided with a mounting groove (9) that cooperates with the step (2). The support frame (4) is sleeved on the top step (2) of the telescopic ladder through the mounting groove (9). A placement groove (5) is provided on the side of the support frame (4) away from the locking pin (3). A plurality of stabilizing rods (7) connected by support springs (6) are provided in the placement groove (5) for stabilizing and fitting against the support surface. The plurality of stabilizing rods (7) fit together with each other. The support frame (4) is provided with a fixing component for fixing the plurality of stabilizing rods (7) in the placement groove (5).

3. The stabilizing device for a telescopic ladder according to claim 2, characterized in that: The fixing assembly includes an extrusion member (8) disposed in the placement groove (5) and attached to the stabilizing rod (7) on one side. The support frame (4) is threadedly connected to a threaded rod (10) on the side near the extrusion member (8), and one end of the threaded rod (10) is in contact with the extrusion member (8). A steel wire (13) is wound on the threaded rod (10). A motor (15) is provided in the bracket (1) at the bottom of the telescopic ladder. An overrunning clutch (16) is sleeved on the output shaft of the motor (15). The steel wire (13) passes through multiple brackets (1) and extends to the bottom of the telescopic ladder and is fixed to the overrunning clutch (16). A button (17) is provided on the bottom of the telescopic ladder. The button (17) is electrically connected to the motor (15).

4. The stabilizing device for a telescopic ladder according to claim 3, characterized in that: Each of the stabilizer bars (7) is connected to a plurality of horizontally adjacent stabilizer bars (7) by a connector, and each of the stabilizer bars (7) is engaged with a limit spring (11) between itself and a plurality of horizontally adjacent stabilizer bars (7).

5. The stabilizing device for a telescopic ladder according to claim 4, characterized in that: Each of the limiting springs (11) is a conical helical spring. A first stabilizing hole (701) is provided on one side of the stabilizing rod (7), and a second stabilizing hole (702) is provided on the other side of the stabilizing rod (7). Both the first stabilizing hole (701) and the second stabilizing hole (702) are cylindrical. The diameter of the first stabilizing hole (701) is smaller than the diameter of the second stabilizing hole (702). The inner wall of the first stabilizing hole (701) is connected to the smaller end of the limiting spring (11), and the inner wall of the second stabilizing hole (702) is connected to the larger end of the limiting spring (11). Each of the supporting springs (6) is provided with a connecting plate (12) near the end of the stabilizing rod (7), and each connecting plate (12) is threadedly connected to the corresponding stabilizing rod (7).

6. The stabilizing device for a telescopic ladder according to claim 5, characterized in that: The support frame (4) includes a support plate (401), a cover plate (402), and a slot (403). The support plate (401) is connected to the top of the top pedal (2). The placement slot (9) is opened at the bottom of the support plate (401), and the placement slot (5) is opened at the top of the support plate (401). The top of the support plate (401) is connected to the cover plate (402) by screws. A slot (403) is opened on one side of both the support plate (401) and the cover plate (402), and the slot (403) is arc-shaped. The shape of the multiple unloaded stabilizing rods (7) is similar to the shape of the slot (403).

7. The stabilizing device for a telescopic ladder according to claim 6, characterized in that: The extrusion component (8) includes an extrusion block (801), a limiting surface (802), a transition section (803), and a clearance surface (804). The extrusion block (801) is connected to one side of the placement groove (5). The extrusion block (801) has a limiting surface (802) on its rear side near the stabilizer rod (7), a transition section (803) in the middle of the extrusion block (801) near the stabilizer rod (7), and a clearance surface (804) on its front side near the stabilizer rod (7). The limiting surface (802) is straight and fits against the stabilizer rod (7). The transition section (803) is arc-shaped. The clearance surface (804) is inclined. The clearance surface (804) gradually moves away from the support spring (6) from the connection point with the transition section (803).

8. The stabilizing device for a telescopic ladder according to claim 7, characterized in that: Each stabilizer bar (7) head is provided with a friction pad (14) to increase friction. The friction pad (14) is made of rubber. The friction pad (14) has a contact surface (141) on the side away from the stabilizer bar (7). The contact surface (141) has an angle of 105° with the horizontal plane.

9. The stabilizing device for a telescopic ladder according to claim 8, characterized in that: Each of the stabilizer bars (7) is made of a highly wear-resistant metal material. The stabilizer bars (7) are rectangular and have the same length. The support spring (6) in the middle is shorter and the support springs (6) on both sides gradually become longer.

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