Intelligent circuit breaker state detection structure

Abstract

The utility model discloses an intelligent circuit breaker state detection structure, which comprises an insulating cover shell arranged in a mounting hole at the bottom of a circuit breaker body, a signal switch accommodated in the insulating cover shell, and an elastic sliding block movably arranged between the insulating cover shell and the signal switch, the elastic sliding block is provided with a push rod which extends out of the insulating housing and is located on the lower side of the rotating shaft, and the signal switch comprises a trigger part arranged on the moving path of the elastic sliding block and a signal transmission plate which is arranged at the bottom of the circuit breaker body and is connected with the control mainboard and the signal switch. According to the technical scheme, the signal switch is arranged in the insulating cover shell and indirectly transmits the action relation with the rotating shaft through the elastic sliding block, so that the signal switch can keep a safe electrical distance from the rotating shaft and the moving contact, meanwhile, the function of detecting the opening and closing states of the circuit breaker is achieved, and a user can clearly know the working state of the circuit breaker conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, and particularly relates to a state detection structure of an intelligent circuit breaker. Background Art

[0002] The intelligent circuit breaker has functions of normally connecting and disconnecting the power distribution and use lines, as well as overloading and short-circuit protection, and integrates a metering module and a controller module with high precision and high stability, so that it has functions such as topological automatic identification, communication encryption, and rapid determination of low-voltage fault information.

[0003] The circuit breaker is installed in a closed space such as a power distribution cabinet, and external personnel are not aware of the opening and closing conditions of the circuit breaker. In order to realize the detection function of the intelligent circuit breaker in the opening or closing state, the existing method is to install an accessory module in the bottom groove opened at the top of the circuit breaker housing, and then install a micro switch for detecting the opening and closing working state of the circuit breaker on the accessory module. When the micro switch is triggered by the contact rotating shaft inside the circuit breaker, a closing or opening signal is sent. The accessory module usually selects an auxiliary contact module that can meet the installation requirements of the micro switch. The existing circuit breaker opening and closing state detection method still has the following problems: First, the cost of setting up such an accessory module is high and it occupies a large space, and accessory modules of different types and functions often cannot be matched and installed with the micro switch, resulting in installation limitations; Second, the micro switch is connected to the controller by a wire passing through the circuit breaker, and the wiring inside the circuit breaker is messy and redundant, resulting in a complex internal structure and a tight space of the circuit breaker. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the micro switch in the prior art is installed in the bottom groove at the top of the circuit breaker through an accessory module to detect the opening and closing state of the circuit breaker, and such an accessory module has a high setting cost and occupies a large space.

[0005] To solve the above technical problem, the utility model provides a state detection structure of an intelligent circuit breaker, including:

[0006] A circuit breaker body, inside which a control main board and a rotating shaft are provided;

[0007] The detection component includes an insulating housing installed in the mounting hole at the bottom of the circuit breaker body, at least one signal switch accommodated in the insulating housing, and an elastic slider movably arranged between the insulating housing and the signal switch. The elastic slider has a push rod extending out of the insulating housing and located below the rotating shaft. The signal switch includes a triggering part arranged on the moving path of the elastic slider. When the circuit breaker trips, the rotating shaft moves away from the push rod, so that the elastic slider moves forward under its own elastic force to press the triggering part; when the circuit breaker closes, the rotating shaft pushes the push rod, so that the elastic slider moves backward under the drive of the rotating shaft to separate from the triggering part.

[0008] The signal transmission board is arranged at the bottom of the circuit breaker body and connects the control main board and the signal switch.

[0009] As a preferred solution, the insulating housing and the signal switch are respectively fixedly connected in the insulating housing.

[0010] As a preferred solution, a receiving cavity suitable for accommodating the elastic slider is formed between the insulating housing and the signal switch. The elastic slider includes a slider body slidably arranged in the receiving cavity and a slider spring connected to one end of the slider body. The slider spring applies an elastic force to the slider body to move forward and press the triggering part.

[0011] As a preferred solution, the slider spring extends along the moving direction of the slider body and is arranged between the slider body and the insulating housing. Opposite spring positioning blocks are respectively arranged on one end of the slider body and the inner wall of the insulating housing, so that both ends of the slider spring are respectively arranged on the two spring positioning blocks.

[0012] As a preferred solution, the triggering part is an elastic button or an elastic contact piece arranged on the signal switch and is located in the receiving cavity.

[0013] As a preferred solution, the bottom of the slider body is in sliding contact with the signal switch, and a relief groove is arranged at the bottom of the slider body. A driving inclined surface is arranged on one side of the relief groove. The slider body drives the driving inclined surface to squeeze and contact the triggering part under the drive of the slider spring.

[0014] As a preferred solution, the push rod is vertically connected to the top of the slider body. A guiding sliding hole through which the push rod can pass is arranged at the top of the insulating housing along the moving direction of the slider body. A compression inclined surface for cooperating with the rotating shaft is arranged at one end of the push rod away from the slider body.

[0015] As a preferred solution, the insulating housing is fixedly installed on the signal transmission board through a screw structure, a snap structure or an adhesive structure. Two signal switches are provided in the insulating housing, and the conductive feet of the two signal switches are respectively fixedly inserted into the signal transmission board.

[0016] As a preferred solution, a bottom groove suitable for installing the signal transmission board is provided at the bottom of the circuit breaker body. The mounting hole is located in the bottom groove. The signal transmission board and the control main board form a pluggable connection through a plug-in component. A jack structure that communicates with the bottom groove and is suitable for the plug-in component to pass through is provided through the bottom of the circuit breaker body.

[0017] As a preferred solution, the signal transmission board has a connecting portion extending opposite to the control main board up and down. The plug-in component includes a pin module provided on one of the control main board and the connecting portion, and a socket module provided on the other of the control main board and the connecting portion and inserted and connected to the pin module.

[0018] As a preferred solution, a limiting edge is provided around the upper port of the mounting hole away from the bottom groove. A step surface corresponding to the limiting edge is provided at the top of the insulating housing. When the insulating housing is inserted into the mounting hole, the step surface is driven to be in contact with the limiting edge.

[0019] The technical solution of the present utility model has the following advantages compared with the prior art:

[0020] 1. In the intelligent circuit breaker state detection structure provided by the present utility model, when the circuit breaker is tripped, the rotating shaft moves away from the push rod. At this time, the elastic slider is in the initial position under its own elastic force and presses the trigger part of the signal switch, so that the signal switch sends a signal indicating that the circuit breaker is tripped; and when the circuit breaker is closed, the rotating shaft pushes against the push rod, thereby driving the elastic slider to separate from the trigger part, so that the signal switch sends a signal indicating that the circuit breaker is closed. The signal switch adopted in the present technical solution is arranged in the insulating housing and indirectly transmits the action relationship with the rotating shaft through the elastic slider, so that the signal switch is completely insulated from the rotating shaft and the moving contact, ensuring that there is a sufficient safe electrical distance between the signal switch and the moving contact, preventing being broken down by the arc, meeting the requirements of electrical insulation performance, and at the same time realizing the detection function of the closing and tripping states of the intelligent circuit breaker, and transmitting the detection information to the control main board through the signal transmission board, so that the circuit breaker can be remotely controlled to detect its working state information, facilitating the user to clearly know the working state of the circuit breaker externally.

[0021] 2. In the intelligent circuit breaker status detection structure provided by the present utility model, a pluggable connection is formed between the signal transmission board and the control main board through a plug-in component, thereby realizing the electrical connection between the signal switch and the control main board. The control main board can transmit the indication signal transmitted by the signal switch through carrier communication. The advantage of such a design is that the connection between the signal transmission board and the control main board is realized by using a plug-in connection, which is convenient and fast to install and connect, has excellent electrical and mechanical properties, avoids using the traditional wire connection method between the signal switch and the control main board, simplifies the installation process, is more convenient to assemble, saves assembly time, is convenient for disassembly and maintenance, has a more compact structure, realizes the modular installation and connection effect, is conducive to the mass production and assembly of products, and improves the assembly efficiency.

[0022] 3. In the intelligent circuit breaker status detection structure provided by the present utility model, when the insulating cover is inserted into the installation hole, the stepped stop surface is driven to fit and contact with the limit stop edge, and the upper port is surrounded by the joint surface formed by the cooperation of the stepped stop surface and the limit stop edge, so as to realize the sealing connection of the upper port position of the installation hole when installing the insulating cover, and can also play a role in dust prevention and insulation, preventing the free gas and particles generated by the circuit breaker breaking from entering the bottom of the circuit breaker through the installation hole and damaging the signal transmission board and its circuit, and at the same time avoiding the occurrence of phase-to-phase short circuit accidents, ensuring the safe electrical distance, and making the use safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art.

[0024] Figure 1 It is a schematic cross-sectional structure diagram of the intelligent circuit breaker status detection structure of the present utility model;

[0025] Figure 2 is Figure 1 a partially enlarged schematic structure diagram of the intelligent circuit breaker status detection structure shown;

[0026] Figure 3 It is a schematic cross-sectional structure diagram of the signal transmission board and the control main board of the present utility model;

[0027] Figure 4 It is a schematic installation structure diagram of the signal transmission board and the detection component of the present utility model;

[0028] Figure 5 It is a schematic installation structure diagram of the signal transmission board in the direction of the bottom of the circuit breaker body of the present utility model;

[0029] Figure 6 It is a schematic structure diagram of the bottom of the circuit breaker body of the present utility model.

[0030] Description of the reference numerals: 1. Circuit breaker body; 11. Bottom groove; 12. Mounting hole; 13. Limit edge; 14. Jack structure; 2. Insulating housing; 21. Spring positioning block; 22. Guide sliding hole; 23. Step stop surface; 3. Signal switch; 31. Trigger part; 4. Elastic slider; 41. Slider body; 42. Slider spring; 43. Relief groove; 44. Driving inclined surface; 5. Push rod; 51. Compressed inclined surface; 6. Signal transmission board; 61. Connecting part; 7. Control main board; 8. Pin assembly; 9. Rotating shaft. Detailed implementation manners

[0031] The technical solutions of the present utility model will be described clearly and completely below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] In the description of the present utility model, it should be noted that the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] Embodiment

[0035] This embodiment provides as Figures 1-6An intelligent circuit breaker status detection structure is shown, which includes a circuit breaker body 1, a detection component, and a signal transmission board 6. A control main board 7, a rotating shaft 9, and a moving contact arranged on the rotating shaft 9 are provided inside the circuit breaker body 1. When the circuit breaker is closed, the rotating shaft 9 drives the moving contact to rotate towards the static contact side, and when the circuit breaker is opened, the rotating shaft 9 drives the moving contact to rotate away from the static contact side. Among them, the detection component includes an insulating cover 2 installed in the installation hole at the bottom of the circuit breaker body 1, at least one signal switch 3 accommodated in the insulating cover 2, and an elastic slider 4 movably arranged between the insulating cover 2 and the signal switch 3. The elastic slider 4 has a push rod 5 extending out of the insulating cover 2 and located below the rotating shaft 9. The signal switch 3 includes a trigger part 31 arranged on the moving path of the elastic slider 4. When the circuit breaker is opened, the rotating shaft 9 moves away from the push rod 5, so that the elastic slider 4 moves forward under its own elastic force to press the trigger part 31; when the circuit breaker is closed, the rotating shaft 9 pushes the push rod 5, so that the elastic slider 4 moves backward under the drive of the rotating shaft 9 to separate from the trigger part 31; the signal transmission board 6 is arranged at the bottom of the circuit breaker body 1 and connects the control main board 7 and the signal switch 3.

[0036] In the above embodiment, when the circuit breaker is opened, the rotating shaft 9 moves away from the push rod 5, and thus does not apply any force to the elastic slider 4. At this time, the elastic slider 4 is in the initial position under its own elastic force and presses the trigger part 31 of the signal switch 3, so that the signal switch 3 sends a signal indicating that the circuit breaker is opened; and when the circuit breaker is closed, the rotating shaft 9 pushes against the push rod 5, thereby driving the elastic slider 4 to separate from the trigger part 31, so that the signal switch 3 sends a signal indicating that the circuit breaker is closed. The signal switch 3 of the present technical solution is arranged in the insulating cover 2 and indirectly transmits the action relationship with the rotating shaft 9 through the elastic slider 4, so that the signal switch is completely insulated from the rotating shaft and the moving contact, ensuring that there is a sufficient safety creepage distance between the signal switch and the moving contact, preventing it from being broken down by the arc, meeting the electrical insulation performance requirements, and at the same time realizing the detection function of the opening and closing states of the intelligent circuit breaker, and transmitting the detection information to the control main board 7 through the signal transmission board 6, so that the circuit breaker can be remotely controlled to detect its working state information, facilitating the user to clearly know the working state of the circuit breaker outside.

[0037] The following will combine Figures 1-3 to make a detailed description of the specific setting method of the elastic slider:

[0038] A receiving cavity suitable for accommodating the elastic slider 4 is formed between the insulating housing 2 and the signal switch 3. The elastic slider 4 includes a slider body 41 slidably disposed in the receiving cavity and a slider spring 42 connected to one end of the slider body 41. The slider spring 42 applies an elastic force to the slider body 41 to move forward and press the trigger portion 31. Further, the slider spring 42 extends along the moving direction of the slider body 41 between the slider body 41 and the insulating housing 2. Opposite spring positioning blocks 21 are respectively provided on one end of the slider body 41 and the inner wall of the insulating housing 2, so that both ends of the slider spring 42 are respectively disposed on the two spring positioning blocks 21. The two spring positioning blocks 21 play a role in positioning and installing the sliding spring, avoiding the position deviation of the sliding spring during use. The trigger portion 31 is an elastic button or an elastic contact piece provided on the signal switch 3 and is located in the receiving cavity. When the elastic button or the elastic contact piece is pressed, the signal switch 3 is triggered to send a signal, and when the elastic button or the elastic contact piece is reset, the signal switch 3 is also triggered to send a signal. In this way, the function that the signal switch 3 can send two signals is realized. The bottom of the slider body 41 is in sliding contact with the signal switch 3, and a relief groove 33 is provided at the bottom of the slider body 41. A driving inclined surface 44 is provided on one side of the relief groove. That is, the slider body 41 contacts or separates from the trigger portion 31 through the driving inclined surface 44. When the circuit breaker is tripped, since the slider body 41 is not driven by the rotating shaft 9, the slider body 41 drives the driving inclined surface 44 to press and contact the trigger portion 31 under the drive of the slider spring 42, thereby triggering the signal switch 3 to send a tripping indication signal.

[0039] As Figure 2 shown, the push rod 5 is vertically connected to the top of the slider body 41. A guiding sliding hole 22 through which the push rod 5 can pass is provided at the top of the insulating housing 2 along the moving direction of the slider body 41. A compression inclined surface 51 cooperating with the rotating shaft 9 is provided at one end of the push rod 5 away from the slider body 41. This design of the compression inclined surface 51 can better conform to the movement trend of the rotating shaft 9, which is beneficial to the better transmission of the movement between the rotating shaft 9 and the elastic slider 4. The rotational movement of the rotating shaft 9 is converted into the linear movement of the slider body 41 through the cooperation of the guiding sliding hole 22 and the push rod 5, and finally the slider body 41 triggers the signal switch 3 to act. When the circuit breaker is closed, the rotating shaft 9 acts on the compression inclined surface 51 position of the push rod 5, thereby driving the slider body 41 to drive the driving inclined surface 44 to move away from the trigger portion 31 against the spring force, so that the driving inclined surface 44 and the trigger portion 31 are separated from each other and do not contact. At this time, after the trigger portion 31 is reset, it is received in the relief groove at the bottom of the sliding body, thereby triggering the signal switch 3 to send a closing indication signal.

[0040] In this embodiment, as Figures 2-3 shown, the insulating housing 2 and the signal switch 3 are respectively fixedly connected to the signal transmission board 6. The insulating housing 2 is fixedly installed on the signal transmission board 6 by a screw structure, a snap structure or an adhesive structure. There are two signal switches 3 in the insulating housing 2. The conductive feet of the two signal switches 3 are respectively fixedly inserted into the signal transmission board 6. This signal switch 3 is preferably a micro switch. By means of the two signal switches 3, two sets of detection signals regarding the opening and closing states of the circuit breaker can be output simultaneously, which can meet the requirements of self-checking and external checking, so as to timely and accurately feedback the opening and closing states of the circuit breaker to users and operators, and is safer and more reliable to use.

[0041] To facilitate the installation connection between the signal transmission board 6 and the control main board 7, a bottom groove 11 suitable for installing the signal transmission board 6 is provided at the bottom of the circuit breaker body 1. The mounting holes are located in the bottom groove. The signal transmission board 6 and the control main board 7 are connected in a pluggable manner through a plug-in component. A jack structure 14 that penetrates the bottom of the circuit breaker body and is suitable for the plug-in component to pass through is provided. Further preferably, referring to Figures 4-5 , the signal transmission board 6 has a connecting portion 61 extending opposite to the control main board 7 up and down. The plug-in component includes a pin module provided on one of the control main board 7 and the connecting portion 61, and a socket module provided on the other of the control main board 7 and the connecting portion 61 and inserted and connected to the pin module. The reliable connection between the signal transmission board 6 and the control main board 7 is realized through the insertion connection of the pin module and the socket module, so as to realize the electrical connection between the signal switch 3 and the control main board 7. The control main board 7 can transmit the indication signal transmitted by the signal switch 3 through carrier communication. The advantage of such a design is that the signal transmission board 6 and the control main board 7 are connected by a plug-in manner, which is convenient and fast for installation connection, has excellent electrical and mechanical properties, avoids using the traditional wire connection method between the signal switch and the control main board, simplifies the installation process, is more convenient for assembly, saves assembly time, is convenient for disassembly and maintenance, has a more compact structure, realizes the modular installation connection effect, is beneficial to the mass production and assembly of products, and improves the assembly efficiency.

[0042] As Figure 6As shown, a limiting edge 13 is disposed around the upper port of the mounting hole 12 away from the bottom groove, and a stepped stop surface 23 corresponding to the limiting edge is provided at the top of the insulating housing 2. When the insulating housing 2 is inserted into the mounting hole, the stepped stop surface 23 is driven to be in close contact with the limiting edge 13. The advantage of such an installation design is that when the insulating housing 2 is inserted into the mounting hole 12, the stepped stop surface 23 is driven to be in close contact with the limiting edge 13, and the upper port of the mounting hole is surrounded by the joint surface formed by the cooperation of the stepped stop surface and the limiting edge, so as to realize a sealing connection function for the upper port position of the mounting hole during the installation of the insulating housing 2, and can also play a role in dust prevention and insulation, preventing the free gas and particles generated by the circuit breaker breaking from entering the bottom of the circuit breaker through the mounting hole and causing damage to the signal transmission board and its circuits, and at the same time avoiding the occurrence of phase-to-phase short-circuit accidents, ensuring a safe electrical distance, and making the use safer and more reliable.

[0043] Obviously, the above embodiments are only examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An intelligent circuit breaker state detection structure, characterized in that: include: A circuit breaker body (1) is provided with a control main board (7) and a rotating shaft (9); A detection assembly comprises an insulating cover (2) mounted in a mounting hole (12) at the bottom of a circuit breaker body, at least one signal switch (3) accommodated in the insulating cover (2), and an elastic slider (4) movably arranged between the insulating cover (2) and the signal switch (3), the elastic slider (4) having a push rod (5) extending out of the insulating cover (2) and located at the lower side of a rotating shaft (9), the signal switch (3) comprising a trigger portion (31) arranged on a moving path of the elastic slider (4), the rotating shaft (9) being away from the push rod (5) when the circuit breaker is opened, so that the elastic slider (4) moves forward under its own elastic force to contact and press the trigger portion (31); the rotating shaft (9) pushes the push rod (5) when the circuit breaker is closed, so that the elastic slider (4) moves backward under the drive of the rotating shaft (9) and is separated from the trigger portion (31); The signal transmission board (6) is arranged at the bottom of the circuit breaker body (1) and is connected to the control main board (7) and the signal switch (3).

2. The intelligent circuit breaker state detection structure according to claim 1, characterized in that: The insulating cover (2) and the signal switch (3) are respectively fixedly connected in the signal transmission board (6).

3. The intelligent circuit breaker state detection structure according to claim 1, characterized in that: A receiving cavity suitable for receiving the elastic slider (4) is formed between the insulating cover (2) and the signal switch (3); the elastic slider (4) comprises a slider body (41) slidably arranged in the receiving cavity, and a slider spring (42) connected to one end of the slider body (41); the slider spring (42) applies an elastic force to the slider body (41) to move forward and contact the trigger part (31).

4. The intelligent circuit breaker state detection structure according to claim 3 is characterized in that: The slider spring (42) is extended along the moving direction of the slider body (41) and is arranged between the slider body (41) and the insulating cover (2); one end of the slider body (41) and the inner wall of the insulating cover (2) are respectively provided with two opposite spring positioning blocks (21), so that the two ends of the slider spring (42) are respectively arranged on the two spring positioning blocks (21).

5. An intelligent circuit breaker state detection structure according to claim 3 or 4, characterized in that: The bottom of the slider body (41) is in sliding contact with the signal switch (3), and a clearance groove (43) is provided at the bottom of the slider body (41), and a driving inclined surface (44) is provided on one side of the clearance groove. The slider body (41) drives the driving inclined surface (44) to press and contact the trigger part (31) under the drive of the slider spring (42). The trigger part (31) is an elastic button or elastic contact piece arranged on the signal switch (3) and is located in the accommodating cavity.

6. The intelligent circuit breaker state detection structure according to claim 5, characterized in that: The push rod (5) is vertically connected to the top of the slider body (41); the top of the insulating cover (2) is provided with a guide sliding hole (22) extending along the moving direction of the slider body (41) for the push rod (5) to pass through; and the push rod (5) is provided with a pressure inclined surface (51) cooperating with the rotating shaft (9) on one end away from the slider body (41).

7. The intelligent circuit breaker state detection structure according to claim 1, characterized in that: The insulating cover (2) is fixedly mounted on the signal transmission board (6) by means of a screw structure, a snap-fit ​​structure or an adhesive structure, two signal switches (3) are provided in the insulating cover (2), and the conductive feet of the two signal switches (3) are respectively fixedly plugged into the signal transmission board (6).

8. The intelligent circuit breaker state detection structure according to claim 7, characterized in that: The bottom of the circuit breaker body (1) is provided with a bottom groove (11) suitable for installing the signal transmission board (6), the installation hole is located in the bottom groove, the signal transmission board (6) and the control main board (7) are connected in a pluggable manner through a plug-in component, and a socket structure (14) is provided through the bottom of the circuit breaker body, which is connected to the bottom groove and suitable for the plug-in component to pass through.

9. The intelligent circuit breaker state detection structure according to claim 8, characterized in that: The signal transmission board (6) has a connecting portion (61) extending up and down opposite to the control main board (7), and the plug-in assembly comprises a pin module arranged on one of the control main board (7) and the connecting portion (61), and a socket module arranged on the other of the control main board (7) and the connecting portion (61) and connected to the pin module by plugging.

10. The intelligent circuit breaker state detection structure according to claim 8, characterized in that: A limiting retaining edge (13) is arranged around the upper end of the mounting hole (12) away from the bottom groove, and a step retaining surface (23) corresponding to the limiting retaining edge is arranged on the top of the insulating cover shell (2). When the insulating cover shell (2) is installed in the mounting hole, the step retaining surface (23) is driven to fit and contact the limiting retaining edge (13).

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