A locking device for inspection lifting platform

Abstract

The present invention provides a locking device for an inspection lifting platform, which relates to the technical field of detection robots, and includes a frame, a driving pin, a locking pin arranged in parallel with the driving pin, and a lever plate for connecting the driving pin and the locking pin, wherein the driving pin is connected to the lever plate through a push rod, and the driving pin is connected to the push rod through a ratchet, and the frame includes a fixed column for guiding the extension and retraction of the driving pin and the locking pin, and a rotating shaft for connecting to the lever plate, the lever plate rotates around the rotating shaft, and a spring sleeved on the outer side of the locking pin is arranged between the lever plate and the fixed column. The present invention has a simple and compact structure, and can effectively self-lock a small gap by using a ratchet and a lever, is easy to operate, and has good self-locking stability. In addition, the self-locking and unlocking between the rods are triggered by the same movement, and the control is simple, and fatigue failure will not occur, and the safety is high.

Description

Technical Field

[0001] The present invention relates to the technical field of detection robots, and in particular to a locking device for a patrol inspection lifting platform. Background Art

[0002] With the development of my country's construction, transportation, power transmission, shipbuilding and other industries, inspection robots, especially high-altitude inspection and maintenance robots, have very good market prospects. Many production workshops often need to carry out inspection and maintenance on the top, and it is necessary to discover cracks and rust in the structure as early as possible, and deal with related problems in a timely manner without affecting production operations.

[0003] Therefore, it is necessary to design a detection robot lifting system with a locking device for related operation applications. During the operation of the lifting system, when the lifting rod device is unfolded, the unfolded rod reaches the maximum stroke and is locked with the adjacent rods through the self-locking device, and the rods rise in sequence, thereby realizing the unfolding of the entire device. When the lifting rod is retracted, the rod to be retracted and the self-locking device between the adjacent rods are unlocked, and the rods descend in sequence to complete the lifting of the lifting rod device.

[0004] However, in the existing detection robot lifting system, due to the multi-stage rod lifting, the self-locking is very difficult to achieve, so now it is very important to solve the problem of self-locking. For example, the Chinese patent utility model patent CN209850972U provides a lifting mechanism of a track suspension intelligent inspection robot system, which involves the field of intelligent detection robots, and in particular, a lifting mechanism matched with a track suspension intelligent inspection robot system. It is composed of a lifting mechanism step servo motor, a worm, a worm support frame, a worm wheel, a screw transmission shaft, a multi-stage screw, a screw nut, a fixed guide rod and a multi-stage guide telescopic rod; the screw nut is provided with multiple levels; the multi-stage guide telescopic rod is provided with at least three levels of guide telescopic rods, the diameters of the guide telescopic rods at each level are different, and the guide telescopic rods at each level are stacked from large to small according to the diameter, and the upper ends of the multi-stage guide telescopic rods are respectively fixedly installed with screw nuts, and the multi-stage screw nuts are respectively matched with the multi-stage screws, and the lifting mechanism step servo motor is installed on the lower base plate of the system's walking trolley, and the fixed guide rod is fixedly connected to the lower part of the lower base plate of the system's walking trolley. The worm gear and worm are used to drive the multi-stage screw to rotate, so as to solve the problem of difficult self-locking.

[0005] However, the following problems still exist in the above lifting mechanism: the gap between two adjacent rods is very small, only 4 mm, which makes it difficult to stably self-lock when locking, the self-locking stability is insufficient, and the automatic unlocking between the rods is difficult to achieve, resulting in poor safety.

[0006] Therefore, in order to solve the above problems, it is necessary for us to design a reasonable and efficient locking device for the inspection lifting platform. Summary of the invention

[0007] The purpose of the present invention is to provide a locking device for an inspection lifting platform, which has a simple and compact structure. By using a ratchet and a lever, it can effectively self-lock at small gaps. It is easy to operate and has good self-locking stability. In addition, the self-locking and unlocking between the rods are triggered by the same movement, which is simple to control, will not cause fatigue failure, and has high safety.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A locking device for an inspection lifting platform, comprising a frame, a driving pin, a locking pin arranged in parallel with the driving pin, and a lever plate for connecting the driving pin and the locking pin, wherein the driving pin is connected to the lever plate through a push rod, and the driving pin is connected to the push rod through a ratchet, the frame comprises a fixing column for guiding the extension and retraction of the driving pin and the locking pin, and a rotating shaft for connecting with the lever plate, the lever plate rotates around the rotating shaft, and a spring sleeved on the outside of the locking pin is arranged between the lever plate and the fixing column;

[0010] When the active pin is pushed by the boss on the lifting platform rod, it moves toward the push rod. Driven by the ratchet, the push rod pushes the lever plate and extends out, so that the lever plate rotates around the rotating shaft, pushing the locking pin out and locking the lifting platform rod.

[0011] When the active pin is pushed by the boss on the lifting platform rod again, it moves toward the push rod. Driven by the ratchet, the push rod pushes the lever plate and then retracts, so that under the elastic force of the spring, the locking pin retracts to release the lock on the lifting platform rod.

[0012] As a preferred embodiment of the present invention, the ratchet comprises a first ratchet arranged at one end of the active pin close to the push rod and a second ratchet arranged at one end of the push rod close to the active pin and used for cooperating and connecting with the first ratchet.

[0013] As a preferred embodiment of the present invention, a sleeve is provided on the outer side of the active pin, at least a part of the ratchet is located in the sleeve, and the sleeve is provided with a guide groove for limiting the displacement direction of the active pin and a limit block for limiting the displacement range of the second ratchet.

[0014] As a preferred embodiment of the present invention, a circular groove for facilitating the insertion of the second ratchet is provided at one end of the push rod close to the second ratchet, so as to facilitate the circumferential rotation of the second ratchet.

[0015] As a preferred embodiment of the present invention, the distance between the rotating shaft and the active pin is smaller than the distance between the rotating shaft and the locking pin.

[0016] As a preferred embodiment of the present invention, a side of the push rod close to the lever plate is arranged in an arc shape.

[0017] As a preferred embodiment of the present invention, the frame also includes a first side plate arranged on the side of the active pin away from the locking pin, and a second side plate arranged on the side of the locking pin away from the active pin; the frame also includes a back plate for connecting the first side plate, the second side plate, the rotating shaft and the fixed column.

[0018] As a preferred embodiment of the present invention, the fixing column is provided with a fixing bolt.

[0019] As a preferred embodiment of the present invention, a locking hole for facilitating the insertion of the locking pin is provided on the lifting platform rod.

[0020] As a preferred embodiment of the present invention, the active pin, the locking pin and the frame are all integrally formed parts.

[0021] The beneficial effects of the locking device for an inspection lifting platform of the present invention are: simple and compact structure, effective self-locking at small gaps by using a ratchet and a lever, easy operation, good self-locking stability, and self-locking and unlocking between rods are triggered by the same movement, simple control, no fatigue failure, and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the overall structure of an embodiment of a locking device for an inspection lifting platform of the present invention in an unlocked state;

[0023] Figure 2 It is a front view schematic diagram of the overall structure of an embodiment of a locking device for an inspection lifting platform of the present invention in a locked state;

[0024] Figure 3 It is a structural schematic diagram of a ratchet wheel in one embodiment of a locking device for an inspection lifting platform of the present invention;

[0025] In the figure: 1, active pin, 11, first ratchet, 12, second ratchet, 13, push rod, 14, sleeve, 2, locking pin, 21, spring, 3, lever plate, 4, frame, 41, fixing column, 411, fixing bolt, 42, rotating shaft, 43, first side plate, 44, second side plate, 45, back plate. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention, which further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0027] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement and steps of modules and steps set forth in these embodiments do not limit the scope of the present invention.

[0028] At the same time, it should be understood that for the convenience of description, the processes in the drawings are not just performed separately, but multiple steps are performed in an interlaced manner.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the present invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0031] Technologies, methods, and systems known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and systems should be considered part of this specification.

[0032] Embodiment 1: Figures 1 to 3 As shown, a locking device for an inspection lifting platform, a locking device for an inspection lifting platform, comprising a frame 4, a driving pin 1, a locking pin 2 arranged parallel to the driving pin 1, and a lever plate 3 for connecting the driving pin 1 and the locking pin 2, the driving pin 1 is connected to the lever plate 3 through a push rod 13, the driving pin 1 is connected to the push rod 13 through a ratchet, the frame 4 comprises a fixed column 41 for guiding the extension and retraction of the driving pin 1 and the locking pin 2, and a rotating shaft 42 for connecting to the lever plate 3, the lever plate 3 rotates around the rotating shaft 42, and a spring 21 sleeved on the outside of the locking pin 2 is arranged between the lever plate 3 and the fixed column 41;

[0033] When the active pin 1 is pushed by the boss on the lifting platform rod, it moves toward the push rod 13. Driven by the ratchet, the push rod 13 pushes the lever plate 3 and extends out, so that the lever plate 3 rotates around the rotating shaft 42, pushing the locking pin 2 out to lock the lifting platform rod.

[0034] When the active pin 1 is pushed by the boss on the lifting platform rod again, it moves toward the push rod 13. Driven by the ratchet, the push rod 13 pushes the lever plate 3 and then retracts, so that under the elastic force of the spring 21, the locking pin 2 retracts to release the lock on the lifting platform rod.

[0035] In the present invention, in the lifting system of the detection robot, the rod body can have multiple rods, the ends of the rods are provided with section sleeves, and the locking devices are installed on the section sleeves, and the adjacent rods are self-locked and automatically unlocked through the locking devices. The rods are made of square carbon fiber composite pipes.

[0036] The frame 4 includes a fixed column 41 for guiding the extension and retraction of the active pin 1 and the locking pin 2, and a rotating shaft 42 for connecting to the lever plate 3, that is, the fixed column 41 of the frame 4 is fixedly installed on the joint sleeve, and at least a part of the active pin 1 and the locking pin 2 are arranged through the fixed column 41, and the front ends of the active pin 1 and the locking pin 2 face the other rod, and the ends of the active pin 1 and the locking pin 2 are connected through the lever plate 3, that is, the active pin 1 and the locking pin 2 are both located on the same side of the lever plate 3.

[0037] Moreover, the lever plate 3 rotates around the rotating shaft 42, and the rotating shaft 42 is located between the active pin 1 and the locking pin 2. Then, when the active pin 1 is pressed backward, the locking pin 2 extends forward; conversely, when the active pin 1 is not pressed backward, the locking pin 2 will not extend forward.

[0038] The active pin 1 is connected to the lever plate 3 through a push rod 13, and the active pin 1 is connected to the push rod 13 through a ratchet. When the end of the active pin 1 away from the lever plate 3 is pushed, the active pin 1 squeezes the ratchet to rotate, and the ratchet rotates a certain angle, so that the push rod 13 moves toward the lever plate 3, thereby squeezing the lever plate 3; when the end of the active pin 1 away from the lever plate 3 is pushed again, the active pin 1 squeezes the ratchet to rotate again, and after the ratchet rotates a certain angle, the push rod 13 no longer squeezes the lever plate 3.

[0039] A spring 21 is provided between the lever plate 3 and the fixing column 41 and is sleeved on the outside of the locking pin 2; the spring 21 can push the lever plate 3 away from the fixing column 41, that is, push the locking pin 2 to move toward the lever plate 3, that is, retract.

[0040] Then, when the end of the active pin 1 away from the lever plate 3 is pushed, the push rod 13 squeezes the lever plate 3, and the lever plate 3 rotates to overcome the elastic force of the spring 21 so that the locking pin 2 extends and abuts against the adjacent rod, completing the self-locking process;

[0041] When the end of the active pin 1 away from the lever plate 3 is pushed again, the push rod 13 no longer presses the lever plate 3, and the lever plate 3 is pushed to rotate under the elastic force of the spring 21, so that the locking pin 2 is retracted, that is, it is automatically unlocked.

[0042] Preferably, the end of the push rod 13 is hinged to the lever plate 3 , and the end of the locking pin 2 is hinged to the lever plate 3 to prevent the push rod 13 and the locking pin 2 from being separated from the lever plate 3 .

[0043] It should be noted that the distance between the rotating shaft 42 and the active pin 1 is smaller than the distance between the rotating shaft 42 and the locking pin 2; that is, the rotating shaft 42 and the lever plate 3 form an eccentric seesaw, and the extrusion displacement of the active pin 1 and the push rod 13 on the lever plate 3 will cause the locking pin 2 to produce a larger displacement. Generally speaking, the ratio of the distance between the rotating shaft 42 and the active pin 1 to the distance between the rotating shaft 42 and the locking pin 2 is in the range of 1:3 to 1:10, that is, the locking pin 2 will produce a displacement of 3 to 10 times the displacement of the push rod 13, so that when the gap between the two adjacent rods is extremely small, the extrusion of the small displacement of the active pin 1 can also be converted into a larger displacement of the locking pin 2.

[0044] Then, even if the whole locking device is small in size, it can still produce good self-locking stability, the locking pin 2 has a long extension length, is not prone to fatigue failure, and has high safety. Moreover, the above self-locking and automatic unlocking are triggered by the same process of the active pin 1 being squeezed, which is simple to control.

[0045] The locking device for the inspection lifting platform of the present invention has a simple and compact structure, and can effectively self-lock at small gaps by using a ratchet and a lever. It is easy to operate and has good self-locking stability. In addition, the self-locking and unlocking between the rods are triggered by the same movement, and the control is simple, fatigue failure will not occur, and the safety is high.

[0046] Embodiment 2, still as Figures 1 to 3 The figure is only one of the embodiments of the present invention. Based on the first embodiment, in a locking device for an inspection lifting platform of the present invention, in order to make the push rod 13, the ratchet and the active pin 1 perform ratchet transmission better, the following design is also provided:

[0047] The ratchet comprises a first ratchet 11 disposed at one end of the active pin 1 close to the push rod 13 and a second ratchet 12 disposed at one end of the push rod 13 close to the active pin 1 and used for being matched and connected with the first ratchet 11 .

[0048] The second ratchet 12 can complete axial linear motion (i.e., displace toward the lever plate 3 under the push of the active pin 1) and circumferential rotational motion (i.e., ratchet transmission with the first ratchet 11). In order to facilitate the limiting of the ratchet, a sleeve 14 is provided on the outside of the active pin 1, and at least a part of the ratchet is located in the sleeve 14. The sleeve 14 is provided with a guide groove for limiting the displacement direction of the active pin 1 and a limit block for limiting the displacement range of the second ratchet 12.

[0049] The sleeve 14 not only limits the extension and retraction direction of the active pin 1, but also limits the range of motion of the second ratchet 12, so that the second ratchet 12 will not separate from the first ratchet 11 and the active pin 1 while moving circumferentially or axially.

[0050] In addition, a circular groove is provided at one end of the push rod 13 close to the second ratchet 12 for facilitating the insertion of the second ratchet 12, so that the second ratchet 12 can perform circumferential rotational motion. The circular groove, the active pin 1 and the second ratchet 12 are all coaxially arranged, so that the part of the second ratchet 12 inserted into the circular groove can perform circumferential rotational motion at a high speed, allowing the second ratchet 12 to easily complete the circumferential rotational motion.

[0051] Finally, a locking hole is provided on the lifting platform rod to facilitate the insertion of the locking pin 2. When the locking pin 2 is extended and inserted into the locking hole of the adjacent rod, it is in a self-locking state; conversely, when the locking pin 2 is retracted and disengaged from the locking hole of the adjacent rod, it is in a self-locking release state.

[0052] In summary: the locking device has the following states:

[0053] First, the adjacent rods have not been fully raised, the bosses of the adjacent rods have not yet contacted the active pin, the locking pin is in a retracted state, and the rods can slide freely (i.e., in an unused state, such as Figure 1 shown);

[0054] Second, the adjacent rods rise to the maximum stroke, the bosses of the adjacent rods contact the active pin 1 to shrink it, the locking pin extends out and is inserted into the locking hole, and the rods cannot slide freely; at this time, the ratchet begins to rotate circumferentially (i.e., the locking is not completed);

[0055] Third, the bosses of the adjacent rods are separated from the active pin 1, the axial linear motion and circumferential rotational motion of the ratchet are blocked by the limit block on the sleeve, and part of the locking pin 2 is still in the locking hole, and the rods are self-locked (i.e., the state of locking is completed, such as Figure 2 shown);

[0056] Fourth, the adjacent rod rises again, and the boss of the adjacent rod acts on the active pin 1 again, and the ratchet continues to perform circumferential rotation and circumferential movement (i.e., the unlocking is not completed);

[0057] Fifth, the guide groove on the ratchet moves to cooperate with the limit block on the sleeve 14, the locking pin 2 completes the contraction under the action of the spring 21, the locking device is unlocked, and the rods can slide freely. This state is the same as the first state (i.e., the state where the unlocking is completed).

[0058] In short, when the ratchet between the active pin 1 and the lever plate 3 rotates, each time the ratchet wheel rotates, the displacement brought to the lever plate 3 by the ratchet wheel changes in the following pattern: no displacement, large displacement, small displacement, large displacement, and no displacement.

[0059] Among them: in the large displacement state, the ratchet rotation reaches the maximum value, but this is the intermediate state of rotation, which is not stable and will definitely fall to the state of small displacement or no displacement; in the small displacement state, the device is self-locking; in the no displacement state, the device is unlocked.

[0060] Embodiment three, still as Figures 1 to 3 As shown, it is only one embodiment of the present invention. On the basis of any of the above embodiments, in a locking device for an inspection lifting platform of the present invention, the frame 4 also includes a first side plate 43 arranged on the side of the active pin 1 away from the locking pin 2, and a second side plate 44 arranged on the side of the locking pin 2 away from the active pin 1; the first side plate 43 and the second side plate 44 are only used to limit the outer sides of the active pin 1 and the locking pin 2, so as to prevent the active pin 1 and the locking pin 2 from moving outward, and to prevent foreign objects from being stuck in the process of extension and retraction of the active pin 1 and the locking pin to cause danger.

[0061] The frame 4 further includes a back plate 45 for connecting the first side plate 43 , the second side plate 44 , the rotating shaft 42 and the fixing column 41 , and the rotating shaft 42 is vertically disposed on the back plate 45 .

[0062] Of course, the fixing column 41 is provided with a fixing bolt 411 , and the fixing column 41 is arranged on the joint sleeve of the rod through the fixing bolt 411 .

[0063] In addition, the side of the push rod 13 close to the lever plate 3 is arranged in an arc shape, so that the push rod 13 can be well matched and connected with the side surface of the lever plate 3 when pushing the lever plate 3 to rotate.

[0064] Finally, the active pin 1, the locking pin 2 and the frame 4 are all integrally formed parts. The structural strength of the integrally formed parts is higher, the entire locking device is not easily damaged, bent or deformed, and has higher stability in use.

[0065] The locking device for the inspection lifting platform of the present invention has a simple and compact structure, and can effectively self-lock at small gaps by using a ratchet and a lever. It is easy to operate and has good self-locking stability. In addition, the self-locking and unlocking between the rods are triggered by the same movement, and the control is simple, fatigue failure will not occur, and the safety is high.

[0066] The present invention is not limited to the above specific implementations, and the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made to the above implementations based on the technical essence of the present invention shall be included in the protection scope of the present invention.

Claims

1. A locking device for an inspection lifting platform, characterized in that: The invention comprises a frame (4), a driving pin (1), a locking pin (2) arranged parallel to the driving pin (1), and a lever plate (3) for connecting the driving pin (1) and the locking pin (2); the driving pin (1) is connected to the lever plate (3) via a push rod (13); the driving pin (1) is connected to the push rod (13) via a ratchet; the frame (4) comprises a fixed column (41) for guiding the extension and retraction of the driving pin (1) and the locking pin (2) and a rotating shaft (42) for connecting to the lever plate (3); the lever plate (3) rotates around the rotating shaft (42); the lever plate (3) and the fixed column (41) are connected to each other. A spring (21) is provided which is sleeved on the outside of the locking pin (2); the ratchet comprises a first ratchet (11) which is provided on one end of the active pin (1) close to the push rod (13) and a second ratchet (12) which is provided on one end of the push rod (13) close to the active pin (1) and is used for being connected with the first ratchet (11); a sleeve (14) is provided on the outside of the active pin (1), at least a part of the ratchet is located in the sleeve (14), and a guide groove for limiting the displacement direction of the active pin (1) and a limit block for limiting the displacement range of the second ratchet (12) are provided on the sleeve (14); When the active pin (1) is pushed by the boss on the lifting platform rod, it moves in the direction of the push rod (13). Driven by the ratchet, the push rod (13) pushes the lever plate (3) and then extends out, so that the lever plate (3) rotates around the rotating shaft (42) to push the locking pin (2) out to lock the lifting platform rod; When the active pin (1) is pushed by the boss on the lifting platform rod again, it moves in the direction of the push rod (13). Driven by the ratchet, the push rod (13) pushes the lever plate (3) and then retracts, so that under the elastic force of the spring (21), the locking pin (2) retracts to release the lock on the lifting platform rod; The locking device has the following states: First, the adjacent rods have not been fully raised, the bosses of the adjacent rods have not yet contacted the active pin, the locking pin is in a retracted state, and the rods can slide freely; Second, the adjacent rods rise to the maximum stroke, the bosses of the adjacent rods contact the active pins to shrink them, the locking pins extend out and insert into the locking holes, and the rods cannot slide freely; at this time, the ratchet starts to rotate in the circumferential direction, that is, the locking is not completed; Third, the bosses of the adjacent rods are separated from the active pins, the axial linear motion and circumferential rotational motion of the ratchet are blocked by the limit block on the sleeve, and part of the locking pin is still in the locking hole, so that the rods are self-locked; Fourth, the adjacent rod rises again, the boss of the adjacent rod acts on the active pin again, and the ratchet continues to perform circumferential rotation and circumferential movement, that is, the incomplete locking state is released; Fifth, the guide groove on the ratchet moves to cooperate with the limit block on the sleeve, the locking pin is retracted under the action of the spring, the locking device is unlocked, and the rods can slide freely. This state is the same as the first state, that is, the state where the unlocking is completed; In short, when the ratchet between the active pin and the lever plate rotates, each time it rotates, the displacement brought to the lever plate by the ratchet changes in the following pattern: no displacement, large displacement, small displacement, large displacement, and no displacement; so that the self-locking and unlocking between the rods are triggered by the same movement.

2. A locking device for an inspection lifting platform according to claim 1, characterized in that: A circular groove for facilitating the insertion of the second ratchet (12) is provided at one end of the push rod (13) close to the second ratchet (12).

3. The locking device for an inspection lifting platform according to claim 1, characterized in that: The distance between the rotating shaft (42) and the active pin (1) is smaller than the distance between the rotating shaft (42) and the locking pin (2).

4. The locking device for an inspection lifting platform according to claim 1, characterized in that: The side of the push rod (13) close to the lever plate (3) is arranged in an arc shape.

5. The locking device for an inspection lifting platform according to claim 1, characterized in that: The frame (4) further comprises a first side plate (43) arranged on a side of the active pin (1) away from the locking pin (2), and a second side plate (44) arranged on a side of the locking pin (2) away from the active pin (1); the frame (4) further comprises a back plate (45) for connecting the first side plate (43), the second side plate (44), the rotating shaft (42) and the fixing column (41).

6. The locking device for an inspection lifting platform according to claim 1, characterized in that: The fixing column (41) is provided with a fixing bolt (411).

7. The locking device for an inspection lifting platform according to claim 1, characterized in that: The lifting platform rod is provided with a locking hole for facilitating the insertion of the locking pin (2).

8. The locking device for an inspection lifting platform according to claim 1, characterized in that: The active pin (1), the locking pin (2) and the frame (4) are all integrally formed parts.

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