A module locking mechanism and a functional module
By forming a two-layer structure of the substrate and the panel on the front side of the functional module, and using the operating lever to drive the lock tongue to retract into the gap, the problem of the lock structure occupying the space in the functional module is solved, and space utilization and operation simplicity are improved.
Patent Information
- Application Number
- CN202411889133.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-04-04
AI Technical Summary
In the design of functional modules, the driving stroke of the locking structure needs to be laterally displaced inside the functional module, resulting in an increase in space occupation and reducing the space utilization rate in the functional module.
The locking member is clamped with a two-layer structure of the substrate and the panel, and the locking tongue on the locking member is retracted into the gap between the panel and the substrate through the operating lever and the grip handle to achieve unlocking of the functional module.
The operating lever and lock tongue are avoided from over-extending into the functional module, improving the space utilization within the functional module, and simplifying the locking and unlocking operation process.
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Figure CN119767588A_ABST
Abstract
Description
Technical Field
[0001] The present specification relates to the field of mechanical technology, and in particular to a module locking mechanism and a functional module. Background Art
[0002] With the development of electronic technology, the functions that electronic devices need to achieve are gradually increasing, and electronic devices are gradually developing towards high-density settings. In order to improve the efficiency of electronic device installation and the flexibility of functions, electronic devices can be modularized, and functional modules are connected by pushing them into the reserved space of the electronic device as a whole.
[0003] In order to avoid loosening caused by vibration and other conditions, a structure for locking with the chassis of the electronic device needs to be set on the functional module. The locking structure needs to extend into the chassis and protrude toward one side of the plate body of the chassis to lock with the plate body. When unlocking, it is achieved by returning the protruding part to the functional module. However, the part where the user performs pressing and other operations is located outside the functional module, and the locking structure needs to be driven by a connecting rod and other results to perform a lateral displacement inside the functional module. This part of the driving stroke needs to be avoided when designing the functional module, occupying the space of the circuit board and the electronic devices thereon in the functional module, thereby reducing the space utilization rate in the functional module. Summary of the invention
[0004] In order to overcome the problems existing in the related art, this specification provides a module locking mechanism and a functional module.
[0005] According to a first aspect of an embodiment of this specification, a module locking mechanism is provided, comprising:
[0006] substrate;
[0007] A panel is fixedly connected to the substrate, with a gap formed between the panel and the substrate;
[0008] A locking member is slidably clamped by the substrate and the panel in the gap, a locking tongue is formed on one side of the locking member and protrudes out of the gap in the width direction of the panel and the substrate, and a guide block formed on the locking member is passed through a first through hole provided on the panel;
[0009] A holding handle is fixedly connected to the panel, and a receiving cavity is provided on a side of the holding handle facing the panel;
[0010] An operating rod is wrapped in the accommodating cavity and is rotatably connected to the holding handle, and a driving block abutting against the guide block is arranged at a first end of the operating rod close to the panel;
[0011] Wherein, when the operating rod is in the first position, the locking member is placed in a locked state;
[0012] When the operating lever is pressed to rotate from the first position to the second position, the locking member is driven to slide toward the side retracted into the gap through the cooperation between the driving block and the guide block, and the locking member is placed in an unlocked state.
[0013] Optionally, the locking member includes:
[0014] A plate body is clamped in the gap, the plate body is formed with a locking portion extending out of the gap, and a sliding hole is provided on the plate body;
[0015] A locking tongue connected to the locking portion;
[0016] The module locking mechanism further comprises:
[0017] A sliding pin is fixed to one of the panel and the base plate. Through the cooperation between the sliding pin and the sliding hole, the locking member can be slidably limited in the gap between the base plate and the panel.
[0018] Optionally, an avoidance groove for avoiding the driving block is further formed on the plate body, the avoidance groove corresponds to the first through hole on the panel and is connected to a portion of the sliding hole.
[0019] Furthermore, at least two groups of the sliding pins and the sliding holes are provided, and the at least two groups of the sliding pins and the sliding holes correspond to the middle part of the locking piece and the edge of the locking piece respectively.
[0020] Optionally, a convex rib is provided on at least one of a side surface of the locking member facing the panel and a side surface of the locking member facing the substrate.
[0021] Optionally, a boss sleeve facing the panel is provided on the substrate, or a boss sleeve facing the substrate is provided on the panel;
[0022] The module locking mechanism further comprises:
[0023] A fixing nail passes through the panel and is sleeved on the boss sleeve to fix the panel and the substrate, and forms the gap by abutting against the panel through the boss sleeve.
[0024] Optionally, the operating lever comprises:
[0025] Rod body;
[0026] A driving block, formed at a first end of the operating rod and connected to the rod body;
[0027] A rotating shaft is provided between the second end of the operating rod and the holding handle, wherein the second end is an end of the operating rod in the opposite direction to the first end;
[0028] Wherein, a reinforcing rib is arranged at the connection between the driving block and the rod body.
[0029] Further, a spring groove is formed between the first end of the operating rod and the second end of the operating rod;
[0030] The module locking mechanism further comprises:
[0031] The first spring is accommodated in the spring groove and is located between the operating rod and the holding handle.
[0032] Optionally, a limiting edge consistent with the extension direction of the lock tongue is formed on the substrate;
[0033] A positioning rod is formed on the limiting edge and passes through a second through hole on the locking tongue;
[0034] The module locking mechanism further comprises:
[0035] The second spring is passed through the positioning rod and is located between the locking tongue and the limiting edge.
[0036] According to a second aspect of the embodiments of this specification, a functional module is provided, comprising any one of the module locking mechanisms described above.
[0037] The technical solutions provided by the embodiments of this specification may have the following beneficial effects:
[0038] In an embodiment of the present specification, a module locking mechanism is provided, in which a two-layer structure of a substrate and a panel is formed on the front side of the functional module to clamp the locking piece, an operating rod and a holding handle wrapped around the operating rod are arranged on the outside of the panel, and a driving block is arranged on the operating rod to cooperate with the guide block on the locking piece. By applying force in the same direction as that of disassembling the functional module, the locking tongue on the locking piece is driven to retract into the gap between the panel and the substrate through the cooperation of the driving block and the guide block to unlock the functional module, thereby avoiding space occupation caused by the operating rod and the locking tongue excessively extending into the interior of the functional module, and improving the utilization rate of the space inside the functional module.
[0039] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.
[0041] Figure 1 It is a structural schematic diagram of a module locking mechanism involved in this application;
[0042] Figure 2 is an operation diagram of a module locking mechanism involved in this application, wherein: Figure 2 (A) The module locking mechanism is in the locked state. Figure 2 (B) The module locking mechanism is in the unlocked state;
[0043] Figure 3 is a schematic structural diagram of a modular locking mechanism involved in the present application, wherein the handle and the panel are hidden to show the locking member and the base plate;
[0044] Figure 4 is a side schematic diagram of a module locking mechanism involved in the present application;
[0045] Figure 5 It is a structural schematic diagram of a holding handle and an operating rod in a module locking mechanism involved in the present application. DETAILED DESCRIPTION
[0046] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this specification. Instead, they are merely examples of devices and methods consistent with some aspects of this specification as detailed in the appended claims.
[0047] The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this specification. The singular forms "a", "the" and "the" used in this specification and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.
[0048] It should be understood that although the terms first, second, third, etc. may be used in this specification to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this specification, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".
[0049] The present application provides a module locking mechanism 100, such as Figure 1 , 2 As shown, including:
[0050] substrate1;
[0051] The panel 2 is fixedly connected to the substrate 1, and a gap 3 is formed between the panel 2 and the substrate 1, wherein the substrate 1 and the panel 2 can be formed by rigid materials such as metal or plastic. In the functional module, the panel 2 is the outer side of the functional module, and the substrate 1 is the inner side wrapped around the panel 2. The connection between the substrate 1 and the panel 2 can be achieved by screws, rivets, welding, etc., and the gap 3 can be formed by a column, boss screw hole, etc. formed on the substrate 1 or the panel 2.
[0052] A locking member 4 is slidably clamped in the gap 3 by the substrate 1 and the panel 2. A locking tongue 40 is formed on one side of the locking member 4 and protrudes out of the gap 3 in the width direction X of the panel 2 and the substrate 1. A guide block 41 formed on the locking member 4 is penetrated through a first through hole 20 provided on the panel 2. The locking member 4 can be slidably connected to the substrate 1 or to the panel 2. The specific connection method can be by inserting screws, rivets and sliding rods therein;
[0053] A holding handle 5 is fixedly connected to the panel 2, and a receiving cavity 50 is provided on a side of the holding handle 5 facing the panel 2;
[0054] The operating rod 6 is wrapped in the accommodating cavity 50 and is rotatably connected to the holding handle 5. A driving block 60 abutting against the guide block 41 is provided at the first end 6A of the operating rod 6 close to the panel 2. The accommodating cavity 50 has a size matching that of the operating rod 6. The operating rod 6 can be placed in the accommodating cavity 50 and wrapped therein.
[0055] Wherein, when the operating rod 6 is in the first position P1, the locking member 4 is placed in a locked state;
[0056] When the operating lever 6 is pressed to rotate from the first position P1 to the second position P2, the locking member 4 is driven to slide toward the side retracted into the gap 3 through the cooperation between the driving block 60 and the guide block 41, and the locking member 4 is placed in an unlocked state.
[0057] The locking member 4 is in Figure 2 (A) shows the left side of the width direction X, that is, the protruding distance of the lock tongue 40 reaches the maximum, and the lock tongue 40 can be inserted into the lock hole provided on the chassis of the electronic device, thereby reaching the locking state of the lock member 4. At this time, the operating lever is in the first position P1.
[0058] The locking member 4 is in Figure 2(B) shows the right side in the width direction X, that is, the locking tongue 40 is pushed into the gap 3 by a certain distance, and the locking tongue 40 can be withdrawn from the lock hole, thereby reaching the unlocking state of the locking member 4. At this time, the operating lever is in the second position P2.
[0059] When a functional module with a module locking mechanism 100 is installed in an electronic device, when the lock tongue 40 of the locking piece 4 abuts against the edge of the chassis of the electronic device, the guide portion 40A set on the edge of the lock tongue 40 can slide to the right along the width direction X until the lock tongue 40 reaches the lock hole, and the locking piece 4 enters a locked state. When it is necessary to remove the functional module from the electronic device, the staff can hold the handle 5 and press the operating rod 6, and the operating rod 6 retreats into the accommodating cavity 50. During this process, the driving block 60 on the operating rod 6 pushes the guide block 41 to slide to the right in the width direction X, so that the locking piece 4 becomes unlocked, so that the staff can take out the functional module.
[0060] On the panel 2, a blocking portion 21 is provided at a position corresponding to the lock tongue 40, and the blocking portion 21 extends from the edge of the locking member 4 to one side of the substrate 1 to block the locking member 4 and prevent it from extending too much. In some cases, the blocking portion 21 can be formed by the side wall of the chassis and also serves as a lock hole.
[0061] The sliding of the locking member 4 relative to the base plate 1 and the panel 2 can be achieved through the cooperation between the sliding pin and the sliding hole, or through the cooperation between the sliding groove and the sliding protrusion. It can be set according to actual needs without limitation.
[0062] A two-layer structure of a substrate and a panel is formed on the front side of the functional module to clamp the locking piece, an operating rod and a holding handle that wraps the operating rod are arranged on the outside of the panel, and a driving block that cooperates with the guide block on the locking piece is arranged on the operating rod. By applying force in the same direction as that of disassembling the functional module, the locking tongue on the locking piece is driven to retract into the gap between the panel and the substrate through the cooperation of the driving block and the guide block to unlock the functional module, thereby avoiding space occupation caused by excessive extension of the operating rod and the locking tongue into the interior of the functional module, and improving the utilization rate of the space inside the functional module.
[0063] Optionally, the locking member 4, such as Figure 3 As shown, including:
[0064] The plate 42 is clamped in the gap 3. The plate 42 is formed with a locking portion 42A extending out of the gap 3. A sliding hole 43 is provided on the plate 42. The locking portion 42A can be understood as a certain area on the plate 42. For example, it can be Figure 3 The area on the left side of the middle plate 42;
[0065] The locking tongue 40 is connected to the locking portion 42A, that is, the portion extending from the plate body 42 out of the gap 3 extends toward the side away from the panel 2, and a locking hook portion 40A is formed at the end of the locking tongue 40. Specifically, the locking hook portion 40A cooperates with the locking hole in the chassis, and the locking hook portion 40A can hook the locking hole to achieve the locking state of the locking member 4;
[0066] The module locking mechanism 100 further includes:
[0067] The sliding pin 7 is fixed to one of the panel 2 and the base plate 1 . Through the cooperation between the sliding pin 7 and the sliding hole 43 , the locking member 4 can be slidably confined in the gap 3 between the base plate 1 and the panel 2 .
[0068] exist Figure 3 In the example shown, the sliding pin 7 can be connected to the base plate 1 by riveting, but the connection method is not limited thereto and can also be achieved by screwing, welding, and the like.
[0069] The sliding pin 7 is matched with the sliding hole 43 , so that the sliding pin 7 can slide in the sliding hole 43 . The extending direction of the sliding hole 43 is the width direction X of the substrate 1 and the panel 2 .
[0070] The base plate 1 is provided with a through hole. When installing, first align the sliding hole 43 of the locking member 4 with the through hole on the base plate 1, then pass the sliding nail 7 through the sliding hole 43 and connect it to the through hole, and then fix the sliding nail 7 by riveting, welding or screwing. Of course, the sliding nail 7 can also be fixed to the panel 2 in the same or similar manner.
[0071] By fixing the sliding pins 7 , the locking member 4 can be firmly clamped between the base plate 1 and the panel 2 , further improving the reliability of the module locking mechanism.
[0072] Optional, such as Figure 1 As shown, an escape groove 44 for evading the driving block 60 is also formed on the plate body 42 , and the escape groove 44 corresponds to the first through hole 20 on the panel 2 and is connected to a portion of the sliding hole 43 .
[0073] Since the mating abutment between the driving block 60 and the guide block 41 needs to have a certain margin to avoid the problem of separation between the driving block 60 and the guide block 41 during the process of pushing the locking piece 4 to slide, the inclined surface size of the driving block 60 needs to be slightly larger than the inclined surface size of the guide block 41. Then, when the driving block 60 moves to the bottom end of the guide block 41, it will hit the panel 2, causing the guide block 41 to fail to be fully pushed, thereby failing to unlock.
[0074] In order to avoid the above problems, it is necessary to open an avoidance groove 44 on the plate body 42 to meet the requirement that the guide block 41 is fully pushed, thereby further improving the reliability of the module locking mechanism operation.
[0075] It should be noted that the sliding pins 7 and the sliding holes 43 can be arranged as one group or multiple groups according to actual needs.
[0076] Further, if Figure 1 As shown, at least two groups of the sliding pins 7 and the sliding holes 43 are provided, and the at least two groups of the sliding pins 7 and the sliding holes 43 correspond to the middle part of the locking member 4 and the edge of the locking member 4 respectively.
[0077] When at least two groups of sliding pins 7 and sliding holes 43 are located at the middle and edge of the locking member 4 , respectively, the locking member 4 can be clamped in the gap 3 more stably.
[0078] Optional, such as Figure 4 As shown, a rib 45 is provided on at least one of a side surface 4A of the locking member 4 facing the panel 2 and a side surface 4B of the locking member 4 facing the substrate 1 .
[0079] The rib 45 can abut against the substrate 1 or the panel 2 to support the locking member 4, avoiding the entire surface of the locking member 4 from rubbing against the panel 2 or the substrate 1 with great resistance during the sliding process, thereby improving the stability of locking and unlocking of the locking member.
[0080] Optional, such as Figure 1 As shown, the substrate 1 is provided with a boss sleeve 80 facing the panel 2, or the panel 2 is provided with a boss sleeve facing the substrate 1 (wherein, Figure 4 Only the boss sleeve 80 is shown to be disposed on the substrate 1);
[0081] The module locking mechanism 100 further includes:
[0082] The fixing nail 81 passes through the panel 2 and is sleeved on the boss sleeve 80 to fix the panel 2 and the substrate 1 , and forms the gap 3 by abutting against the panel 2 through the boss sleeve 80 .
[0083] By disposing the boss sleeve 80 , the substrate 1 and the panel 2 can be fixed while the gap 3 is formed, thereby saving space on the substrate 1 and the panel 2 .
[0084] Optional, such as Figure 5 As shown, the operating lever 6 comprises:
[0085] The rod body 61 is approximately L-shaped, and the rod body 61 can be formed in one piece or assembled in sections;
[0086] A driving block 60 is formed at the first end 6A of the operating rod 6 and connected to the rod body 61;
[0087] The rotating shaft 62 is passed between the second end 6B of the operating rod 6 and the holding handle 5, wherein the second end 6B is an end of the operating rod 6 in the opposite direction to the first end 5A;
[0088] A reinforcing rib 63 is provided at the connection between the driving block 60 and the rod body 61 .
[0089] Since the driving block 60 is arranged in an inclined manner, the strength of the connection between the driving block 60 and the rod body 61 is relatively small. By providing the reinforcing rib 63, the toughness of the operating rod 6 can be enhanced to avoid damage during operation and improve the reliability of the module locking mechanism.
[0090] Optional, such as Figure 5 As shown, a spring groove 64 is formed between the first end 6A of the operating rod 6 and the second end 6B of the operating rod 6;
[0091] The module locking mechanism 100 further includes:
[0092] The first spring 90 is accommodated in the spring groove 64 and is located between the operating rod 6 and the holding handle 5 .
[0093] When the first spring 90 is not provided, the staff is required to manually reset the operating rod 6. By providing the first spring 90, the operating rod 6 can be ejected to facilitate the next operation of the operating rod 6, thereby improving the operational smoothness of the module locking mechanism.
[0094] Optional, such as Figure 1 , 2 As shown, a limiting edge 11 which is consistent with the extension direction of the locking tongue 40 is formed on the base plate 1, and the locking member 4 can be supported to retreat by the limiting edge 11;
[0095] A positioning rod 12 is formed on the limiting edge 11 and passes through the second through hole 40B on the locking tongue 40. The positioning rod 12 can improve the sliding stability of the locking member 4.
[0096] The module locking mechanism 100 further includes:
[0097] The second spring 91 passes through the positioning rod 12 and is located between the locking tongue 40 and the limiting edge 11 .
[0098] By setting the second spring 91, a restoring force can be provided to the locking member 4, so that it can rebound when the operating rod 6 is pressed and released, thereby realizing automatic recovery from the unlocked state to the locked state, and improving the usability of the module locking mechanism.
[0099] When the blocking portion 21 also serves as a locking hole, the head of the positioning rod 12 may have a limiting block to prevent the locking tongue 40 from extending too much.
[0100] Correspondingly, the present application also provides a functional module, comprising any one of the module locking mechanisms 100 described above.
[0101] The functional module may be a pluggable line card, network card, hard disk, fan, computing node, storage node, switching node, blade server, etc. It may be set according to actual needs without any restriction.
[0102] In an embodiment of the present specification, a module locking mechanism is provided, in which a two-layer structure of a substrate and a panel is formed on the front side of the functional module to clamp the locking piece, an operating rod and a holding handle wrapped around the operating rod are arranged on the outside of the panel, and a driving block is arranged on the operating rod to cooperate with the guide block on the locking piece. By applying force in the same direction as that of disassembling the functional module, the locking tongue on the locking piece is driven to retract into the gap between the panel and the substrate through the cooperation of the driving block and the guide block to unlock the functional module, thereby avoiding space occupation caused by the operating rod and the locking tongue excessively extending into the interior of the functional module, and improving the utilization rate of the space inside the functional module.
[0103] Those skilled in the art will readily appreciate other embodiments of the specification after considering the specification and practicing the invention claimed herein. The specification is intended to cover any variations, uses or adaptations of the specification that follow the general principles of the specification and include common knowledge or customary techniques in the art that are not claimed in the specification. The specification and examples are to be considered exemplary only, and the true scope and spirit of the specification are indicated by the following claims.
[0104] It should be understood that the present description is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present description is limited only by the appended claims.
[0105] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.
Claims
1. A module locking mechanism, characterized in that: include: substrate; A panel is fixedly connected to the substrate, with a gap formed between the panel and the substrate; A locking member is slidably clamped by the substrate and the panel in the gap, a locking tongue is formed on one side of the locking member and protrudes out of the gap in the width direction of the panel and the substrate, and a guide block formed on the locking member is passed through a first through hole provided on the panel; A holding handle is fixedly connected to the panel, and a receiving cavity is provided on a side of the holding handle facing the panel; An operating rod is wrapped in the accommodating cavity and is rotatably connected to the holding handle, and a driving block abutting against the guide block is arranged at a first end of the operating rod close to the panel; Wherein, when the operating rod is in the first position, the locking member is placed in a locked state; When the operating lever is pressed to rotate from the first position to the second position, the locking member is driven to slide toward the side retracted into the gap through the cooperation between the driving block and the guide block, and the locking member is placed in an unlocked state.
2. The module locking mechanism according to claim 1, characterized in that: The locking member comprises: A plate body is clamped in the gap, the plate body is formed with a locking portion extending out of the gap, and a sliding hole is provided on the plate body; A locking tongue connected to the locking portion; The module locking mechanism further comprises: A sliding pin is fixed to one of the panel and the base plate. Through the cooperation between the sliding pin and the sliding hole, the locking member can be slidably limited in the gap between the base plate and the panel.
3. The module locking mechanism according to claim 2, characterized in that: An escape groove for evading the driving block is also formed on the plate body, the escape groove corresponds to the first through hole on the panel and is communicated with a portion of the sliding hole.
4. The module locking mechanism according to claim 2, characterized in that: At least two groups of the sliding pins and the sliding holes are provided, and the at least two groups of the sliding pins and the sliding holes correspond to the middle part of the locking piece and the edge of the locking piece respectively.
5. The module locking mechanism according to claim 1, characterized in that: A convex rib is provided on at least one of a side surface of the locking member facing the panel and a side surface of the locking member facing the substrate.
6. The module locking mechanism according to claim 1, characterized in that: The substrate is provided with a boss sleeve facing the panel, or the panel is provided with a boss sleeve facing the substrate; The module locking mechanism further comprises: A fixing nail passes through the panel and is sleeved on the boss sleeve to fix the panel and the substrate, and forms the gap by abutting against the panel through the boss sleeve.
7. The module locking mechanism according to claim 1, characterized in that: The operating lever comprises: Rod body; A driving block, formed at a first end of the operating rod and connected to the rod body; A rotating shaft is provided between the second end of the operating rod and the holding handle, wherein the second end is an end of the operating rod in the opposite direction to the first end; Wherein, a reinforcing rib is arranged at the connection between the driving block and the rod body.
8. The module locking mechanism according to claim 7, characterized in that: A spring groove is formed between the first end of the operating rod and the second end of the operating rod; The module locking mechanism further comprises: The first spring is accommodated in the spring groove and is located between the operating rod and the holding handle.
9. The module locking mechanism according to claim 1, characterized in that: The base plate is formed with a limiting edge which is consistent with the extension direction of the lock tongue; A positioning rod is formed on the limiting edge and passes through a second through hole on the locking tongue; The module locking mechanism further comprises: The second spring is passed through the positioning rod and is located between the locking tongue and the limiting edge.
10. A functional module, characterized in that: The invention comprises the module locking mechanism as described in any one of claims 1 to 9 above.