Platform ladder

Abstract

The utility model relates to a platform ladder which comprises ladder frames and a platform, the ladder frames are respectively connected to the front end and the rear end of the platform, when the platform ladder is folded, the ladder frames respectively rotate by taking the connecting position as a rotating center to finish folding of the frame, and when the platform ladder is unfolded, the ladder frames respectively rotate by taking the connecting position as a rotating center to finish unfolding of the ladder frames and upwards support the platform. The ladder frame comprises ladder pipes and pedals, the ladder pipes are opposite to each other, and the pedals are arranged between the ladder pipes; the length of each ladder pipe can be independently adjusted, so that a user can adjust the levelness of the platform ladder without left-right linkage, the operation difficulty is reduced, and meanwhile, the time for adjusting the ladder feet on uneven terrains is also saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a platform ladder. BACKGROUND

[0002] The existing platform ladder is a commonly used climbing auxiliary tool, mainly used for providing a working platform, and is widely used in families and various construction scenes. Generally, the structure of the platform ladder comprises a platform and a ladder foot, the ladder foot is connected with the platform through a hinge, can rotate around one end of the platform, and realizes unfolding and folding of the platform ladder. The ladder foot of the existing platform ladder is of fixed length, resulting in fixed overall height of the platform ladder, and the use height cannot be adjusted. This structure cannot guarantee the level of the platform in some uneven ground environments (such as stairs, slopes or pothole ground), resulting in limited applicability of the platform ladder in these environments and safety hazards.

[0003] Although there are some designs of adjustable foot pipes on the market at present, most of them are mainly based on the simultaneous telescoping of two foot pipes, lack independent foot pipe adjustment function, and cannot meet the needs in scenes requiring different foot pipe lengths. INVENTION CONTENTS

[0004] The utility model aims at providing a platform ladder with independent telescoping of each foot pipe, suitable for slopes, steps and uneven ground and other environments.

[0005] The utility model is achieved as follows:

[0006] A platform ladder comprises a ladder frame and a platform, the ladder frame is connected at the front end and the rear end of the platform respectively, when the platform ladder is folded, the ladder frame rotates around the connection as the center, the frame folding is completed, when the platform ladder is unfolded, the ladder frame rotates around the connection, the ladder frame unfolding is completed and the platform is supported upwards, the ladder frame comprises a ladder pipe and a step, the ladder pipes are arranged opposite to each other, and the step is arranged between the ladder pipes.

[0007] The ladder pipe comprises an upper ladder pipe, a lower ladder pipe and a locking device, the upper end of the upper ladder pipe is connected with the platform, the lower end of the upper ladder pipe is connected with the lower ladder pipe in a sliding mode, the upper ladder pipe slides along the length direction of the upper ladder pipe, the upper ladder pipe or the lower ladder pipe is provided with the locking device, the locking device locks the position between the upper ladder pipe and the lower ladder pipe, so that the height of the ladder pipe is adjusted.

[0008] Compared with the conventional fixed-height ladder, the independent sliding adjustment of the upper and lower ladder pipes realizes flexible adjustment of the length of the ladder foot, so that the platform ladder can adapt to complex terrains such as slopes, stairs and pothole ground, thereby maintaining the horizontal stability of the platform. This design greatly enhances the applicability and safety of operation of the platform ladder on irregular ground.

[0009] Each ladder pipe can be adjusted in length independently, so that the user can adjust the horizontal of the platform ladder without left-right linkage, which reduces the operation difficulty and saves the time for adjusting the ladder foot on uneven terrain.

[0010] The technical measures can also be used to solve the problems.

[0011] Further, the locking device comprises a shell and a locking mechanism, the shell is provided with a receiving cavity, the locking mechanism comprises a lever, an insertion block and a spring, the insertion block and the spring are arranged in the receiving cavity, the shell is provided with a first opening corresponding to the position of the insertion block, one end of the spring abuts against the insertion block, and the other end of the spring abuts against the inner wall of the receiving cavity; the spring constitutes a reset mechanism of the insertion block, and the lower end of the lever extends into the receiving cavity and is connected with the insertion block, and the upper end of the lever extends out of the receiving cavity to form a lever part convenient for the user to hold.

[0012] The user only needs to lever the lever to easily adjust the height of the ladder pipe and quickly lock when needed, which greatly simplifies the adjustment process and improves the operation convenience.

[0013] The spring reset device arranged in the locking mechanism enables the insertion block to be automatically reset to the locking position in the unlocked state, preventing the ladder pipe from accidentally sliding during the adjustment process.

[0014] The locking device structure avoids the user's hands directly contacting the sliding part of the ladder pipe during the operation process, effectively preventing the occurrence of hand clamping accidents.

[0015] Further, the upper ladder pipe is a 'D' shaped upper ladder pipe, the shell is provided with a connecting port penetrating upward and downward, the lower end of the upper ladder pipe is inserted into the connecting port and clamped tightly, so that the shell and the upper ladder pipe are fixedly connected, and the upper ladder pipe is provided with a second opening corresponding to the position of the first opening.

[0016] The 'D' shaped structure of the upper ladder pipe and the connecting port of the shell realize the clamping connection in the upward and downward directions, so that the connection between the shell and the upper ladder pipe is more stable, preventing loosening or deviation during use.

[0017] The second opening corresponding to the insertion block of the locking device is formed in the upper ladder pipe, so that the insertion block can be accurately inserted during the locking process, realizing the accurate positioning of the ladder pipe.

[0018] The 'D' shaped structure enhances the strength of the ladder pipe and improves the safety and bearing stability of the ladder pipe on complex terrain.

[0019] The design realizes quick clamping and installation of the shell and the upper ladder pipe, without the need for complex additional connecting parts, reduces the assembly difficulty of the ladder pipe, improves the production efficiency, and thus reduces the production cost.

[0020] Further, the lower ladder pipe is a "F" shaped lower ladder pipe, and the third openings are arranged at intervals in the lower ladder pipe. The upper ladder pipe and the lower ladder pipe are slidingly connected, and the lower ladder pipe slides along the length direction of the upper ladder pipe. The plug is inserted into the corresponding first opening through the second opening and the third opening to lock the relative position of the upper ladder pipe and the lower ladder pipe, so as to adjust the height of the ladder pipe.

[0021] The lower ladder pipe adopts a "F" shaped structure, which is more closely connected with the upper ladder pipe, ensuring that both slide in the same direction when adjusting the height, effectively avoiding possible deviation or shaking during adjustment. This design greatly improves the stability of the ladder pipe sliding process, ensuring the safety of the ladder at various heights.

[0022] The "F" shaped structure of the lower ladder pipe is provided with multiple third openings at intervals, so that the plug can be inserted and locked in the openings at different heights. This multi-point opening design provides multiple adjustable height positions, allowing users to accurately adjust the ladder pipe height as needed, better adapting to the needs of various working scenarios.

[0023] The "F" shaped structure of the lower ladder pipe has good torsional resistance and lateral support force in terms of stress, which not only enhances the load-bearing capacity of the ladder pipe, but also improves the impact resistance and durability of the platform ladder overall structure. This design helps to maintain the stability of the platform on complex or uneven ground.

[0024] By inserting the plug through the second opening, the third opening and into the corresponding first opening in sequence, a quick and stable locking is formed. Users can simplify the operation process when adjusting the height, and quickly complete the locking, improving the operation convenience.

[0025] Further, the upper end of the lower ladder pipe is connected with a blocking block outside the connecting port of the shell, and the height of the ladder pipe is adjusted by sliding the lower ladder pipe along the upper ladder pipe. When the blocking block abuts against the shell, the upper ladder pipe and the lower ladder pipe are fully unfolded, reaching the maximum height of the ladder pipe.

[0026] The blocking block is arranged at the upper end of the lower ladder pipe and abuts against the shell when the ladder pipe is fully unfolded, forming a physical limit to prevent the upper and lower ladder pipes from continuing to slide beyond the safe range. This limiting protection design effectively prevents the risk of unstable structure caused by excessive extension of the ladder pipe, ensuring the safe use of the platform ladder.

[0027] The limiting function of the blocking block allows the user to quickly identify and confirm that the ladder pipe has reached the maximum height when adjusting the height, without the need for additional observation or measurement, and the operation is intuitive and convenient. This design improves the user experience, especially when working at high altitudes, allowing for more focused attention and improved operational efficiency.

[0028] The physical limiting design of the blocking block reduces the height adjustment beyond the safe range caused by user misoperation. Even in complex terrain or scenarios requiring frequent height adjustment, the potential danger caused by the instability of the ladder pipe can be effectively reduced.

[0029] Further, the lower end of the lower ladder pipe is provided with a foot cover.

[0030] The foot cover is usually made of rubber or plastic material with good friction, which can effectively increase the contact friction between the ladder foot and the ground, prevent the platform ladder from sliding or shifting during use, especially on smooth or wet ground, greatly improving the safety of use.

[0031] The soft material of the foot cover can reduce the direct contact between the lower end of the ladder pipe and the ground, prevent leaving scratches or indentations when using the platform ladder on surfaces such as ceramic tiles or wooden floors, and improve the protection effect on the ground, increasing the applicability of the platform ladder in various locations.

[0032] The foot cover has a certain buffering performance, which can play a shock-absorbing role when the user climbs up and down the ladder or moves on the ladder, reducing the shaking of the ladder, further improving the stability of the ladder, especially suitable for work scenarios that require high stability.

[0033] The beneficial effects of the present utility model are as follows:

[0034] The present utility model, the ladder pipe of the platform ladder adopts an adjustable height up-down sliding structure, which can independently adjust the length of each ladder foot in cooperation with the locking device, adapt to various complex terrains such as slopes, steps and uneven ground, ensure the platform to be horizontal and stable, and meet the needs of different working scenarios.

[0035] The present utility model, the locking device is designed to constitute an efficient locking and resetting mechanism through the shell, the lever, the plug and the spring, ensuring that the ladder pipe can be reliably fixed after adjusting the height. The lever design is convenient for user operation, avoiding the risk of hand clamping, and significantly improving the operation safety and convenience.

[0036] The present utility model, the blocking block at the upper end of the lower ladder pipe provides limiting protection, preventing the ladder pipe from continuing to stretch beyond the safe range, effectively avoiding the instability caused by excessive sliding of the ladder pipe, and providing additional safety protection for the user.

[0037] This utility model features an independent height adjustment design for each ladder leg, along with simple locking and unlocking operations, enabling users to quickly adjust and stably fix the height of the platform ladder, meeting the needs of frequent adjustments. It is also easy to operate and helps improve work efficiency. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a platform ladder (with the lower ladder tube close to the upper ladder tube).

[0039] Figure 2 This is a cross-sectional view of the platform ladder from another angle (with the lower ladder tube close to the upper ladder tube).

[0040] Figure 3 This is an assembly drawing of the ladder frame (with the lower ladder tube close to the upper ladder tube).

[0041] Figure 4 This is a schematic diagram of a platform ladder (with the lower ladder tube far away from the upper ladder tube).

[0042] Figure 5 This is a cross-sectional view of the platform ladder from another angle (with the lower ladder tube away from the upper ladder tube).

[0043] Figure 6 This is an assembly drawing of the ladder frame (with the lower ladder tube away from the upper ladder tube).

[0044] Figure 7 This is an exploded view of the ladder frame (with the lower ladder tube far from the upper ladder tube).

[0045] Figure 8 This is a schematic diagram of the casing.

[0046] Figure 9 This is a diagram illustrating a platform ladder placed on an uneven surface. Detailed Implementation

[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0048] Implementation examples, in conjunction with Figures 1 to 9 As shown, a platform ladder includes a ladder frame 1 and a platform 2. The ladder frame 1 is connected to the front end and the rear end of the platform 2 respectively. When the platform ladder is folded, the ladder frame 1 rotates around the connection point as the rotation center to complete the frame folding. When the platform ladder is unfolded, the ladder frame 1 rotates around the connection point to complete the unfolding of the ladder frame 1 and support the platform 2 upwards. The ladder frame 1 includes a ladder tube 3 and a step 4. The ladder tube 3 stands opposite to the ladder tube 3, and the step 4 is disposed between the ladder tube 3.

[0049] The ladder pipe 3 comprises an upper ladder pipe 7, a lower ladder pipe 8 and a locking device 5, the upper end of the upper ladder pipe 7 is connected to the platform 2, the lower end of the upper ladder pipe 7 and the lower ladder pipe 8 are slidingly connected, the upper ladder pipe 7 slides along the length direction of the upper ladder pipe 7, the upper ladder pipe 7 or the lower ladder pipe 8 is provided with the locking device 5, the locking device 5 locks the position between the upper ladder pipe 7 and the lower ladder pipe 8, thereby adjusting the height of the ladder pipe 3.

[0050] Further, the locking device 5 comprises a shell 6 and a locking mechanism, the shell 6 is provided with a containing cavity 61, the locking mechanism comprises a lever 51, an insertion block 52 and a spring 53, the insertion block 52 and the spring 53 are arranged in the containing cavity 61, the shell 6 is provided with a first opening 61 corresponding to the position of the insertion block 52, one end of the spring 53 abuts against the insertion block 52, the other end of the spring 53 abuts against the inner wall of the containing cavity 61, the spring 53 constitutes a reset mechanism of the insertion block 52, the lower end of the lever 51 extends into the containing cavity 61 and is connected to the insertion block 52, the upper end of the lever 51 extends out of the containing cavity 61 and forms a lever part 511 which is convenient for the user to hold.

[0051] Further, the upper ladder pipe 7 is a " " shaped upper ladder pipe, the shell 6 is provided with a connecting port 62 which penetrates up and down, the lower end of the upper ladder pipe 7 is inserted into the connecting port 62 and is clamped tightly, so as to fixedly connect the shell 6 and the upper ladder pipe 7, the upper ladder pipe 7 is provided with a second opening 71 corresponding to the position of the first opening 61.

[0052] Further, the lower ladder pipe 8 is a " " shaped lower ladder pipe, the lower ladder pipe 8 is provided with a third opening 81 at intervals, the upper ladder pipe 7 and the lower ladder pipe 8 are slidingly connected, the lower ladder pipe 8 slides along the length direction of the upper ladder pipe 7, the insertion block 52 penetrates through the second opening 71 and the third opening 81 and is inserted into the corresponding first opening 61, thereby locking the relative position of the upper ladder pipe 7 and the lower ladder pipe 8, thereby adjusting the height of the ladder pipe 3.

[0053] Further, the upper end of the lower ladder pipe 8 is connected with a blocking block 10 outside the connecting port 62 of the shell 6, the lower ladder pipe 8 slides along the upper ladder pipe 7 to adjust the height of the ladder pipe 3, when the blocking block 10 abuts against the shell 6, the upper ladder pipe 7 and the lower ladder pipe 8 are completely unfolded and reach the maximum height of the ladder pipe 3.

[0054] Further, the lower end of the lower ladder pipe 8 is provided with a foot cover 9.

[0055] Adjusting operation mode of the platform ladder:

[0056] When the platform ladder is used on uneven ground or slope, the height of each ladder foot can be adjusted respectively to ensure the horizontal state of the platform 2. By adjusting the length of the ladder feet one by one, the user can adapt the ladder feet to the ground position of different height according to the terrain requirement, thereby ensuring the stability of the ladder under complex terrain.

[0057] The user can operate the locking device 5 using the lever 51. By pushing the lever 51, the plug 52 is adjusted out of the current opening position. After the ladder pipe 3 is slid to the desired height, the lever 51 is released, and the plug 52 is automatically reset and inserted into the corresponding third opening 81 under the action of the spring 53, realizing the quick locking of the ladder foot. This locking mode can ensure the stability of the user's adjustment at different heights, and is convenient for adjustment at any time.

[0058] When the ladder foot is fully expanded or reaches the maximum adjustable height, the blocking block 10 will automatically abut against the shell 6, forming a physical limit to prevent the ladder pipe 3 from overstretching. This limiting design not only ensures the safety of the platform ladder and prevents overstretching during adjustment, but also provides a clear adjustment end point, which is convenient for the user to confirm the maximum safe height.

[0059] After completing the height adjustment, the anti-skid foot cover 9 of the ladder foot ensures firm contact with the ground. The material of the foot cover 9 increases the friction, which is especially suitable for unstable ground such as slopes and steps, further improving the stability of the ladder. The foot cover 9 also reduces the wear caused by contact with the ground, enhancing the durability of the ladder.

[0060] Under different terrain conditions, the user does not need complex operation, but can adjust the ladder foot through the simple lever 51 adjustment and locking mechanism. The user can quickly adjust the height of the ladder pipe 3 during construction, improve the operation efficiency, and meet the stable support demand under complex working conditions.

[0061] Through the above operation mode, the platform ladder realizes efficient and convenient height adjustment in various complex terrain environments, ensures the stability of the platform 2, and provides users with a safer and more flexible use experience.

Claims

1. A platform ladder, comprising a ladder frame and a platform, the ladder frame is connected to the front end and the rear end of the platform respectively, when the platform ladder is folded, the ladder frame rotates around the connection as the rotation center, the folding of the frame is completed, when the platform ladder is unfolded, the ladder frame rotates around the connection, the unfolding of the ladder frame and the supporting of the platform are completed, characterized in that: the ladder frame comprises ladder pipes and a pedal, the ladder pipes are opposite to each other, and the pedal is arranged between the ladder pipes; the ladder pipe comprises an upper ladder pipe, a lower ladder pipe and a locking device, the upper end of the upper ladder pipe is connected to the platform, the lower end of the upper ladder pipe and the lower ladder pipe are slidingly connected, the upper ladder pipe slides along the length direction of the upper ladder pipe, the upper ladder pipe or the lower ladder pipe is provided with the locking device, the locking device locks the position between the upper ladder pipe and the lower ladder pipe, so as to adjust the height of the ladder pipe; the locking device comprises a shell and a locking mechanism, the shell is provided with a containing cavity, the locking mechanism comprises a lever, an insertion block and a spring, the insertion block and the spring are arranged in the containing cavity, the shell is provided with a first opening corresponding to the position of the insertion block, one end of the spring abuts against the insertion block, and the other end of the spring abuts against the inner wall of the containing cavity, the spring constitutes a reset mechanism of the insertion block, the lower end of the lever extends into the containing cavity and is connected to the insertion block, and the upper end of the lever extends out of the containing cavity to form a lever part which is convenient for a user to hold. the upper ladder pipe is a " " shaped upper ladder pipe, the shell is provided with a connecting port which penetrates up and down, the lower end of the upper ladder pipe is inserted into the connecting port and clamped tightly, so as to fixedly connect the shell and the upper ladder pipe, and the upper ladder pipe is provided with a second opening corresponding to the position of the first opening. the lower ladder pipe is a " " shaped lower ladder pipe, the lower ladder pipe is provided with a third opening at intervals, the upper ladder pipe and the lower ladder pipe are slidingly connected, the lower ladder pipe slides along the length direction of the upper ladder pipe, the insertion block passes through the second opening and the third opening and is inserted into the corresponding first opening to lock the relative position of the upper ladder pipe and the lower ladder pipe, so as to adjust the height of the ladder pipe. the upper end of the lower ladder pipe is connected with a blocking block outside the connecting port of the shell, the height of the ladder pipe is adjusted when the lower ladder pipe slides along the upper ladder pipe, when the blocking block abuts against the shell, the upper ladder pipe and the lower ladder pipe are completely unfolded and reach the maximum height of the ladder pipe.

2. The platform ladder of claim 1, wherein: the lower end of the lower ladder pipe is provided with a foot cover.

3. The platform ladder of claim 2, wherein: ​ 4. The platform ladder of claim 3, wherein: ​ 5. The platform ladder of claim 1, wherein: ​

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