Ladder joint

Abstract

The utility model relates to a ladder joint. The ladder joint comprises a first joint and a second joint which are hinged to each other, a middle shaft penetrating through the first joint and the second joint is arranged on the first joint and the second joint, an end block is arranged on one side of the middle shaft, and a pressing block is arranged on the other side of the middle shaft. The upper portion and the lower portion of one side of the end block are connected with limiting columns, multiple sets of corresponding through holes are formed in the first joint and the second joint in the circumferential direction, and the limiting columns are inserted into the through holes for locking. A push rod is connected to one side of the end block, a connecting rod is arranged on one side of the pressing block, and the push rod is fixedly connected with the connecting rod. A limiting mechanism is arranged between the pressing block and the second joint. The folding mechanism has the advantages that the limiting column is driven to leave the through hole through pressing of the pressing block, the first joint and the second joint rotate to adjust the unfolding angle, when the pressing block is pressed, the telescopic rod is limited through the pin shaft, adjustment is prevented from being affected, the limiting column penetrates into the through hole after adjustment, the first joint and the second joint are locked, the locking structure is simple, and operation is convenient. Installation and replacement are simple, and adjustment operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of ladder accessories, in particular to a ladder joint. Background Art

[0002] Ladders are commonly used in daily life, the power industry, and construction. Traditional ladder joints are often integrated with the legs. Joints can be used as joint components in ladders, but they can also be used in other applications, such as folding stools, folding chairs, and corridor handrails.

[0003] Ladder joints facilitate adjustment of the ladder's deployment angle. Once the joints are rotated to the appropriate angle, they need to be locked. Existing ladder joints have complex locking mechanisms, often installed internally. This makes installation and replacement cumbersome and laborious, making them inconvenient and insecure. Furthermore, they lack stability, posing safety risks. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a ladder joint, which can solve the problems in the prior art that the locking structure of the ladder joint is relatively complex, the locking structure is installed inside the joint, the installation and replacement are troublesome and laborious, the use is not convenient, and the stability is not enough, resulting in certain safety hazards.

[0005] To solve the above technical problems, the technical solution of the present invention is as follows: comprising a first joint and a second joint hingedly connected to each other, wherein two first joints and two second joints are provided respectively, and the two second joints are provided on the outsides of the two first joints, characterized in that an intermediate shaft is provided on the first joint and the second joint, and passes through the two joints, one end of the intermediate shaft extends outside the second joint, an end block is provided on one side of the intermediate shaft, and a pressing block is provided on the other side;

[0006] Two limiting posts are connected to the upper and lower sides of the end block near the second joint, respectively. Multiple groups of corresponding through holes are provided in the circumference of the first joint and the second joint. The end block drives the limiting posts to be inserted into the through holes to lock the first joint and the second joint.

[0007] A push rod is connected to the middle position of one side of the end block close to the second joint, and the push rod is arranged inside the intermediate shaft. A connecting rod is connected to the center position of one side of the pressing block close to the second joint, and the connecting rod is arranged inside the intermediate shaft, and the push rod is fixedly connected to the connecting rod.

[0008] The sum of the lengths of the push rod and the connecting rod is greater than the length of the intermediate shaft;

[0009] An annular cover is provided on the outer periphery of the pressing block, and a limiting mechanism is provided between the pressing block and the second joint.

[0010] Furthermore, the diameter of the connecting rod is larger than the diameter of the pushing rod.

[0011] Furthermore, the limiting mechanism includes a telescopic rod and a spring, the telescopic rod is formed by an outer rod and an inner rod being sleeved together, the end of the outer rod is fixed to the outside of the second joint, and the end of the inner rod is fixed to the side of the pressing block close to the second joint. A spring is sleeved on the telescopic rod, and the outer rod and the inner rod are limited in position by a pin shaft.

[0012] Furthermore, the ends of the outer rod close to and away from the second joint are respectively provided with limiting holes, the pin shaft is movably inserted into the limiting holes, and the inner rod is provided with corresponding limiting holes. The pin shaft passes through the limiting holes on the outer rod and the inner rod to limit the positions of the outer rod and the inner rod.

[0013] Furthermore, a fixing block is provided on the outer sides of the two first joints respectively, and a fixing block is provided between the two second joints.

[0014] After adopting the above structure, the advantages of the utility model are: the end block is driven to move by pressing the pressing block, so that the limit column leaves the through hole of the first joint and the second joint, and the first joint and the second joint can be rotated to adjust the expansion angle. When the pressing block is pressed, the telescopic rod contracts, the spring is compressed, and the telescopic rod is limited by the pin shaft. During adjustment, the limit column is away from the through hole to avoid affecting the adjustment. After adjusting to a certain angle, the pin shaft is released, and the spring rebounds to drive the telescopic rod to extend, and the pressing block is away from the second joint, driving the end block to move, so that the limit column penetrates into the through hole, locking the first joint and the second joint. The locking structure is simple, easy to install and replace, and the adjustment operation is convenient. The setting of the fixed block makes the hinge structure of the first joint and the second joint more stable and safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 It is a side view of the utility model;

[0017] Figure 3 This is a schematic diagram of the connection structure between the first joint, the second joint and the intermediate shaft of the utility model;

[0018] Figure 4 This is a schematic diagram of the connection structure between the pressing block and the end block of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments can enable those skilled in the art to more fully understand the present invention, but the present invention is not limited to the scope of the embodiments.

[0020] like Figure 1 and Figure 2 As shown, this specific embodiment adopts the following technical solution: it includes a first joint 1 and a second joint 2 that are hinged to each other, two first joints 1 and two second joints 2 are respectively provided, the two second joints 2 are arranged on the outside of the two first joints 1, and fixed blocks 3 are respectively provided on the outside of the two first joints 1, and a fixed block 3 is provided between the two second joints 2. The setting of the fixed block 3 makes the hinge structure of the first joint 1 and the second joint 2 more stable and safer to use.

[0021] like Figure 3 As shown, the first joint 1 and the second joint 2 are provided with an intermediate shaft 4 running through the two. The intermediate shaft 4 is a hollow structure, and one end of the intermediate shaft 4 extends out of the second joint 2. An end block 5 is provided on one side of the intermediate shaft 4, and a pressing block 6 is provided on the other side.

[0022] like Figure 4 As shown, two limiting columns 7 are respectively connected to the upper and lower sides of the end block 5 close to the second joint 2. A plurality of corresponding through holes 8 are provided in the circumferential direction of the first joint 1 and the second joint 2. The end block 5 drives the limiting columns 7 to be inserted into the through holes 8 to lock the first joint 1 and the second joint 2. After the first joint 1 and the second joint 2 rotate to different angles, the limiting columns 7 are inserted into the through holes 8 at different positions to lock them.

[0023] A push rod 9 is connected to the middle position of one side of the end block 5 close to the second joint 2, and the push rod 9 is arranged inside the intermediate shaft 4. A connecting rod 10 is connected to the center position of one side of the pressing block 6 close to the second joint 2, and the connecting rod 10 is arranged inside the intermediate shaft 4, and the pushing rod 9 is fixedly connected to the connecting rod 10. The diameter of the connecting rod 10 is larger than the diameter of the pushing rod 9, and the sum of the lengths of the pushing rod 9 and the connecting rod 10 is larger than the length of the intermediate shaft 4. The pressing block 6 is pressed toward the second joint 2, and the pushing rod 9 is pushed to move by the connecting rod 10, driving the end block 5 and the limiting column 7 to move away from the second joint 2, so that the limiting column 7 leaves the through hole 8, releasing the lock on the first joint 1 and the second joint 2, and the first joint 1 and the second joint 2 can be rotated to adjust the deployment angle.

[0024] An annular cover 61 is provided on the periphery of the pressing block 6, and a limiting mechanism is provided between the pressing block 6 and the second joint 2. The limiting mechanism includes a telescopic rod 11 and a spring 12. The telescopic rod 11 is formed by sleeves of an outer rod and an inner rod. The end of the outer rod is fixed to the outside of the second joint 2, and the end of the inner rod is fixed to the side of the pressing block 6 close to the second joint 2. A spring 12 is sleeved on the telescopic rod 11. The ends of the outer rod close to and away from the second joint 2 are respectively provided with limiting holes, and a pin 13 is movably inserted into the limiting hole. A corresponding limiting hole is provided on the inner rod, and the pin 13 passes through the limiting hole at the end of the outer rod close to the second joint 2. The hole and the limiting holes on the inner rod limit the positions of the outer rod and the inner rod, so that the pressing block 6 remains in a pressed state, and the limiting column 7 will not be inserted into the through hole 8, so as to avoid affecting the rotation adjustment of the first joint 1 and the second joint 2. After the adjustment is completed, the limiting column 7 is inserted into the through hole 8 to lock the first joint 1 and the second joint 2. The pin 13 passes through the limiting hole at the end of the outer rod away from the second joint 2 and the limiting hole on the inner rod to limit the positions of the outer rod and the inner rod, ensuring that the limiting column 7 is located in the through hole 8 and remains in a locked state. The annular cover 61 can protect the telescopic rod 11 and the spring 12 to prevent them from being scratched by external objects.

[0025] Working principle: The end block 5 is moved by pressing the pressing block 6, so that the limiting column 7 leaves the through hole 8 of the first joint 1 and the second joint 2. The first joint 1 and the second joint 2 can be rotated to adjust the expansion angle. When the pressing block 6 is pressed, the telescopic rod 11 contracts and the spring 12 is compressed. The telescopic rod 11 is limited by the pin 13. When adjusting, the limiting column 7 is away from the through hole to avoid affecting the adjustment. After adjusting to a certain angle, the pin 13 is released, and the spring 12 rebounds to drive the telescopic rod 11 to extend. The pressing block 6 is away from the second joint 2, driving the end The block 5 moves so that the limit column 7 passes through the corresponding through hole 8 after adjustment, and the first joint 1 and the second joint 2 are re-locked. The pin 13 passes through the limit hole at the end of the outer rod away from the second joint 2 and the limit hole on the inner rod to limit the position of the outer rod and the inner rod, ensuring that the limit column 7 is located in the through hole 8 and remains in a locked state, ensuring safe use. The locking structure of the ladder joint is simple, easy to install and replace, and easy to adjust. The setting of the fixed block 3 makes the hinged structure of the first joint 1 and the second joint 2 more stable and safer to use.

[0026] The above shows and describes the basic principles and main features of the present invention, as well as the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A ladder joint, comprising a first joint and a second joint hingedly connected to each other, wherein two first joints and two second joints are provided, and the two second joints are provided outside the two first joints, characterized in that: An intermediate shaft is provided on the first joint and the second joint, and runs through the two joints. One end of the intermediate shaft extends out of the second joint. An end block is provided on one side of the intermediate shaft, and a pressing block is provided on the other side. Two limiting posts are connected to the upper and lower sides of the end block near the second joint, respectively. Multiple groups of corresponding through holes are provided in the circumference of the first joint and the second joint. The end block drives the limiting posts to be inserted into the through holes to lock the first joint and the second joint. A push rod is connected to the middle position of one side of the end block close to the second joint, and the push rod is arranged inside the intermediate shaft. A connecting rod is connected to the center position of one side of the pressing block close to the second joint, and the connecting rod is arranged inside the intermediate shaft, and the push rod is fixedly connected to the connecting rod. The sum of the lengths of the push rod and the connecting rod is greater than the length of the intermediate shaft; An annular cover is provided on the outer periphery of the pressing block, and a limiting mechanism is provided between the pressing block and the second joint.

2. A ladder joint according to claim 1, characterized in that: The diameter of the connecting rod is greater than the diameter of the pushing rod.

3. A ladder joint according to claim 1, characterized in that: The limiting mechanism includes a telescopic rod and a spring. The telescopic rod is formed by a sleeve connection of an outer rod and an inner rod. The end of the outer rod is fixed to the outside of the second joint, and the end of the inner rod is fixed to the side of the pressing block close to the second joint. A spring is sleeved on the telescopic rod, and the outer rod and the inner rod are limited in position by a pin shaft.

4. A ladder joint according to claim 3, characterized in that: The ends of the outer rod close to and away from the second joint are respectively provided with limiting holes, and the pin shaft is movably inserted into the limiting holes. The inner rod is provided with corresponding limiting holes, and the pin shaft passes through the limiting holes on the outer rod and the inner rod to limit the positions of the outer rod and the inner rod.

5. A ladder joint according to claim 1, characterized in that: A fixing block is respectively provided on the outer sides of the two first joints, and a fixing block is provided between the two second joints.

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