Pushing mechanism of vending machine

Abstract

The utility model relates to the technical field of vending machines, and provides a pushing mechanism of a vending machine, which comprises a conveying belt and a push plate component, the conveying belt moves in one direction towards the goods outlet end of the vending machine, the push plate component is arranged on the conveying belt and comprises a push plate, the push plate is rotatably arranged on the push plate component, and a clamping groove is formed between the push plate and the push plate component; the conveying belt partially penetrates through the clamping groove, the push plate rotates to the position where the conveying belt is clamped, the conveying belt is fixed to the clamping groove, and the conveying belt moves and drives the push plate of the push plate assembly to move towards the goods outlet end of the vending machine so that goods can be pushed out. The push plate rotates to the position where the conveying belt is loosened, the push plate assembly is in a free moving state on the conveying belt, the push plate assembly moves towards the initial position of the push plate assembly along the conveying belt under the action of external force, and the push plate assembly can be manually pushed to move towards the initial position during replenishment.

Description

Technical Field

[0001] This utility model relates to the field of vending machine technology, specifically to a push mechanism for a vending machine. Background Technology

[0002] Existing vending machine push mechanisms typically include a push plate mounted on a conveyor belt. The push plate moves along its initial position in the dispensing direction under the action of the conveyor belt to push out goods. When the vending machine needs to replenish goods on the conveyor belt, the push plate needs to move along its initial position to replenish the goods at its front end. However, existing methods usually involve switching the direction of the motor shaft rotation to retract the conveyor belt, and the push plate moves along its initial position as the conveyor belt retracts. This requires a person to manually touch the start button of the motor each time goods are replenished.

[0003] Some vending machine push mechanisms have several push plates and pressure plates on the conveyor belt, which are fixedly connected by screws. The conveyor belt is positioned between the push plates and pressure plates, which are also fixed and clamped by screws. Goods are placed between two adjacent push plates. This method has higher production costs, requires a large number of push plates and pressure plates, and is cumbersome to install. For example, a vending machine push mechanism is disclosed in Chinese Patent No. ZL202420721792.0. Utility Model Content

[0004] This utility model proposes a pushing mechanism for an automatic vending machine. By providing a pusher plate assembly on the conveyor belt, production and installation costs are reduced. The pusher plate is rotatably mounted on the pusher plate assembly. The rotation of the pusher plate clamps or loosens the conveyor belt between the pusher plate and the pusher plate assembly. When the conveyor belt is loosened, the pusher plate assembly is in a free state on the conveyor belt. Thus, when restocking, the user pushes the pusher plate assembly along the initial position direction, causing the pusher plate assembly to move on the conveyor belt. In this way, the pusher plate assembly can be manually retracted without having to switch the rotation direction of the motor shaft to retract the conveyor belt.

[0005] A push mechanism for an automatic vending machine designed for this purpose includes a conveyor belt that runs unidirectionally toward the dispensing end of the automatic vending machine and a push plate assembly disposed on the conveyor belt. The push plate assembly includes a push plate, which is rotatably disposed on the push plate assembly, and a clamping groove is formed between the push plate and the push plate assembly.

[0006] The conveyor belt passes through the clamping groove, the push plate rotates to the position of clamping the conveyor belt, the conveyor belt is fixed on the clamping groove, the conveyor belt moves and drives the push plate of the push plate assembly to move towards the dispensing end of the vending machine to push out the goods.

[0007] The pusher plate rotates to the position where the conveyor belt is released, and the pusher plate assembly is in a free-moving state on the conveyor belt. Under the action of external force, the pusher plate assembly moves along the conveyor belt towards the initial position of the pusher plate assembly.

[0008] The push plate assembly includes a sliding seat, the push plate is rotatably connected to the sliding seat, and a clamping groove is formed between the push plate and the sliding seat.

[0009] The sliding seat is provided with a receiving groove for accommodating the installation push plate. One end of the receiving groove is provided with an open end corresponding to the rotation direction of the sliding seat, and the other end of the receiving groove is provided with a continuous sealing plate. One end of the sealing plate abuts against the inner side of the receiving groove, and the other end of the sealing plate abuts against the outer side of the receiving groove.

[0010] The push plate is limited to rotate between the open end of the receiving groove and the sealing plate;

[0011] One end of the sliding seat is provided with a through slot corresponding to the conveyor belt, and the outer surface of the sealing plate and the outer end face of the through slot are on the same plane. When the push plate rotates to clamp the conveyor belt, it is fixed on the sealing plate.

[0012] An elastic deformation fastening part is provided between the push plate and the sliding seat. When the push plate rotates to the position of clamping the conveyor belt, it triggers the elastic deformation of the elastic deformation fastening part, and the push plate fastens onto the sliding seat. When the push plate rotates in the direction of releasing the conveyor belt, it triggers the elastic deformation of the elastic deformation fastening part, and the elastic deformation fastening part between the push plate and the sliding seat separates.

[0013] The elastic deformation fastening part includes an elastic buckle disposed between the push plate and the sliding seat, and a buckle hole. The buckle hole is provided with a guide slope, and the elastic buckle is fastened or disengaged from the buckle hole along the guide slope.

[0014] The sliding seat has a continuous sealing plate at the engagement point between the push plate and the sliding seat; the fastening hole is set on the sealing plate, and the elastic buckle is set on the push plate.

[0015] The push plate is provided with reinforcing ribs to increase its mechanical strength.

[0016] The conveyor belt is mounted on a support. A drive roller is provided at one end of the support corresponding to the conveyor belt, and a rotating roller is provided at the other end of the support corresponding to the conveyor belt. The conveyor belt covers the drive roller and the rotating roller. One rotating end of the drive roller is connected to the motor drive shaft so that the motor drives the conveyor belt to run. The push plate assembly includes a sliding seat, which is slidably connected to the support.

[0017] The support is provided with a first side plate, a second side plate and a third side plate, and the first side plate, the second side plate and the third side plate form an assembly cavity for accommodating and installing the drive roller and the motor.

[0018] The support is equipped with a detector for detecting goods at the outlet end of the conveyor belt.

[0019] The support is provided with a sliding groove, and the sliding seat is provided with a sliding foot that cooperates with the sliding groove. The sliding seat slides along the sliding groove, and the sliding foot is limited on the sliding groove.

[0020] The beneficial technical effects of this utility model are as follows:

[0021] By installing a pusher plate assembly on the conveyor belt, production and installation costs are reduced. The pusher plate is rotatably mounted on the pusher plate assembly. The rotation of the pusher plate clamps or releases the conveyor belt between the pusher plate and the pusher plate assembly. When the conveyor belt is released, the pusher plate assembly is in a free state on the conveyor belt. Thus, when replenishing goods, the user pushes the pusher plate assembly in the direction of the initial position, and the pusher plate assembly moves on the conveyor belt. In this way, the pusher plate assembly can be manually retracted without having to switch the direction of the motor shaft rotation to retract the conveyor belt. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a three-dimensional structural diagram of the push plate assembly in its initial position according to an embodiment of the present invention.

[0024] Figure 2 This is a three-dimensional structural diagram of the pusher assembly located at the front end (discharging end) of the pusher mechanism according to an embodiment of the present invention.

[0025] Figure 3 This is a three-dimensional cross-sectional structural diagram of the pusher assembly located at the front end (discharging end) of the pusher mechanism according to an embodiment of the present invention.

[0026] Figure 4 This is a three-dimensional cross-sectional view of the pusher assembly in the case of a loosened conveyor belt according to an embodiment of the present invention.

[0027] Figure 5 This is a three-dimensional cross-sectional structural diagram of the pusher assembly returning to its initial position after releasing the conveyor belt, according to an embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram showing the assembly and disassembly of the pushing mechanism according to an embodiment of the present invention.

[0029] Figure 7 This is a schematic diagram showing the assembly and disassembly of the pushing mechanism in another orientation according to an embodiment of the present invention.

[0030] Figure 8 This is a three-dimensional cross-sectional structural diagram of a pusher plate assembly according to an embodiment of the present invention.

[0031] Figure 9 This is a schematic diagram of the three-dimensional cross-sectional structure of the push plate assembly in another orientation according to an embodiment of the present invention.

[0032] Figure 10 This is a three-dimensional cross-sectional view of the pusher assembly releasing the conveyor belt in one embodiment of the present invention.

[0033] Figure 11 This is an exploded view of the assembly structure of the push plate assembly according to an embodiment of the present invention.

[0034] Figure 12 This is an exploded view of the push plate assembly from another orientation according to an embodiment of the present invention. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In order to make the above-mentioned objects, features and advantages of the present application more apparent and understandable, many specific details are set forth in the following description in order to provide a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] See Figures 1-12 A push mechanism for an automatic vending machine includes a conveyor belt 1 that runs unidirectionally toward the dispensing end of the vending machine and a push plate assembly 2 disposed on the conveyor belt 1. The push plate assembly 2 includes a push plate 4, which is rotatably disposed on the push plate assembly 2, and a clamping groove 3 is formed between the push plate 4 and the push plate assembly 2.

[0037] The conveyor belt 1 passes through the clamping groove 3, the push plate 4 rotates to the position of clamping the conveyor belt 1, the conveyor belt 1 is fixed on the clamping groove 3, the conveyor belt 1 moves and drives the push plate 4 of the push plate assembly 2 to move towards the dispensing end of the vending machine to realize the dispensing of goods.

[0038] The pusher plate 4 rotates to the position where the conveyor belt 1 is released, the pusher plate assembly 2 is in a free-moving state on the conveyor belt 1, and the pusher plate assembly 2 moves along the conveyor belt 1 towards the initial position of the pusher plate assembly 2 under the action of external force.

[0039] By installing a pusher assembly 2 on the conveyor belt 1, production and installation costs are reduced. The pusher 4 is rotatably mounted on the pusher assembly 2. The rotation of the pusher 4 clamps or releases the conveyor belt 1 between the pusher 4 and the pusher assembly 2. When the conveyor belt 1 is released, the pusher assembly 2 is in a free state on the conveyor belt 1. Thus, when replenishing goods, the user pushes the pusher assembly 2 in the direction of the initial position, and the pusher assembly 2 moves on the conveyor belt. In this way, the pusher assembly 2 can be manually retracted without having to switch the direction of the motor shaft rotation to retract the conveyor belt 1, making manual replenishment convenient.

[0040] The push plate assembly 2 includes a sliding seat 5, a push plate 4 is rotatably connected to the sliding seat 5, and a groove 3 is formed between the push plate 4 and the sliding seat 5.

[0041] The sliding seat 5 is provided with a receiving groove 6 for accommodating the installation push plate 4. One end of the receiving groove 6 is provided with an open end 7 corresponding to the rotation direction of the sliding seat 5, and the other end of the receiving groove 6 is provided with a continuous sealing plate 8. One end of the sealing plate 8 abuts against one inner side of the receiving groove 6, and the other end of the sealing plate 8 abuts against the other outer side of the receiving groove 6.

[0042] The push plate 4 is limited to rotating between the open end 7 of the receiving groove 6 and the sealing plate 8;

[0043] Because the top of the sliding seat 5 is open, the receiving groove 6 is connected to the clamping groove 3.

[0044] The sliding seat 5 has a through slot 27 corresponding to the conveyor belt 1 and a connecting clamping groove 3. The outer surface of the sealing plate 8 and the outer end face of the through slot 27 are on the same plane. When the push plate 4 rotates to clamp the conveyor belt 1, it is fixed on the sealing plate 8. After the push plate 4 clamps the conveyor belt 1, it cannot rotate arbitrarily to the position of releasing the conveyor belt 1.

[0045] In this embodiment, the sliding seat 5 is provided with an arc-shaped groove at the position where the bottom of the push plate 4 clamps the conveyor belt 1. The bottom of the push plate 4 is arc-shaped. When the push plate 4 rotates, the surface of the conveyor belt 1 sinks into the arc-shaped groove, and the bottom of the push plate 4 clamps the conveyor belt 1.

[0046] In this embodiment, the outer surface of the sealing plate 8 and the outer end face of the through groove 27 are on the same plane, and the sealing plate 8 does not protrude outward from the sliding seat 5, which can reduce the overall thickness of the push plate assembly 2.

[0047] In this embodiment, the push plate 4 is rotatably connected to the sliding seat 5 via a rotating shaft.

[0048] An elastic deformation fastening part 9 is provided between the push plate 4 and the sliding seat 5. When the push plate 4 rotates to the position of clamping the conveyor belt 1, it triggers the elastic deformation of the elastic deformation fastening part 9, and the push plate 4 is fastened to the sliding seat 5. When the push plate 4 rotates in the direction of releasing the conveyor belt 1, the push plate 4 triggers the elastic deformation of the elastic deformation fastening part 9, and the elastic deformation fastening part 9 between the push plate 4 and the sliding seat 5 is separated.

[0049] The elastic deformation fastening part 9 includes an elastic buckle 10 disposed between the push plate 4 and the sliding seat 5, and a buckle hole 11. The buckle hole 11 is provided with a guide slope 12, and the elastic buckle 10 is fastened or disengaged from the buckle hole 11 along the guide slope 12.

[0050] The sliding seat 5 is provided with a continuous sealing plate 8 at the fastening point between the push plate 4 and the sliding seat 5; the fastening hole 11 is provided on the sealing plate 8, and the elastic buckle 10 is provided on the push plate 4.

[0051] In this embodiment, the sealing plate 8 is a continuous plate without being broken, which increases the connection strength between the push plate 4 and the sliding seat 5. Since there is an elastic deformation fastening part 9 between the push plate 4 and the sliding seat 5, the fastening position between the push plate 4 and the sliding seat 5 is also on the sealing plate 8. The sealing plate 8 is a continuous plate, which ensures both the fastening toughness between the push plate 4 and the sliding seat 5 and the mechanical strength of the sliding seat 5.

[0052] The push plate 4 is provided with reinforcing ribs 13 to increase the mechanical strength of the push plate 4, which effectively increases the strength of the push plate 4, making it less likely to deform when pushing goods, and improving the service life of the push plate 4.

[0053] The conveyor belt 1 is mounted on the support 14. The support 14 is provided with a drive roller 15 at one end of the conveyor belt 1 and a rotating roller 16 at the other end of the support 14. The conveyor belt 1 covers the drive roller 15 and the rotating roller 16. One rotating end of the drive roller 15 is connected to the drive shaft of the motor 17 so that the motor 17 drives the conveyor belt 1 to run. The push plate assembly 2 includes a sliding seat 5, which is slidably connected to the support 14.

[0054] The support 14 is provided with a first side plate 18, a second side plate 19 and a third side plate 20, and the first side plate 18, the second side plate 19 and the third side plate 20 form an assembly cavity 21 for accommodating and installing the drive roller 15 and the motor 17.

[0055] In this embodiment, the motor shaft of the motor 17 passes through the second side plate 19 and is connected to the first gear. The rotating shaft of one end of the drive roller 15 passes through the second side plate 19 and is connected to the second gear. The first gear meshes with the second gear. An installation clearance groove is provided between the first side plate 18 and the support 14 corresponding to the conveyor belt 1. The installation clearance groove is connected to the assembly cavity 21 so that the conveyor belt 1 passes through the installation clearance groove between the first side plate 18 and the support 14 and is connected to the drive roller 15.

[0056] In this embodiment, the front end of the support 14 is provided with a bracket 25 for supporting the rotating roller 16 and the circuit board. The bottom of the bracket 25 is through which the conveyor belt 1 can cover the entire support 14. The conveyor belt 1 is similar to the track structure that covers the tank wheel.

[0057] In this embodiment, the bracket 25 is fixedly connected to the front end of the support 14 by screws. The rotating roller 16 is rotatably mounted on the bracket 25 via a rotating shaft. The motor shaft of the motor 17 drives the first gear to rotate. The first gear meshes with the second gear to drive the drive roller 15 to rotate, thereby driving the conveyor belt 1 and the rotating roller 16 to run.

[0058] The support 14 is equipped with a detector 22 for detecting goods at the outlet end of the conveyor belt 1. The detector 22 is mounted on the circuit board and is electrically connected to the circuit board via a plug-in pin.

[0059] In this embodiment, the bracket 25 is provided with a cover 26 for covering the circuit board and the detector 22. The cover 26 is fixed to the bracket 25 by a buckle or screw. The cover 26 is provided with a detection clearance opening corresponding to the detector 22. The detector 22 probe detects whether there is any goods pushed out at the front end of the conveyor belt through the detection clearance opening. The bracket 25 is located on the outer side of the front end of the conveyor belt 1. When the conveyor belt 1 runs and drives the push plate 4 to push out goods, if the detector 22 detects that there are goods, the motor 17 stops moving, so that the motor 17 will only push out one item each time it starts.

[0060] The support 14 is provided with a sliding groove 23, and the sliding seat 5 is provided with a sliding foot 24 that cooperates with the sliding groove 23. The sliding seat 5 slides along the sliding groove 23, and the sliding foot 24 is limited on the sliding groove 23.

[0061] In this embodiment, the sliding seat 5 has two inclined, open sliding legs 24 on its left and right sides. The sliding legs 24 are embedded in the sliding grooves 23, such as... Figure 8 As shown.

[0062] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

[0063] In the above description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0064] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In the foregoing description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to fixed connections using screws, rivets, or welding; detachable connections; or connections formed by metal processing (die casting, deep drawing, lathe machining, etc.) or injection molding; they can also be mechanical or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0066] In the above description of this application, unless otherwise expressly specified and limited, the use of terms such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0067] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

Claims

1. A push mechanism for an automatic vending machine, characterized in that: It includes a conveyor belt (1) that runs unidirectionally toward the dispensing end of the vending machine, and a push plate assembly (2) disposed on the conveyor belt (1). The push plate assembly (2) includes a push plate (4), which is rotatably disposed on the push plate assembly (2). A groove (3) is formed between the push plate (4) and the push plate assembly (2). The conveyor belt (1) passes through the clamping groove (3), and the push plate (4) rotates to the position of clamping the conveyor belt (1). The conveyor belt (1) is fixed on the clamping groove (3). The conveyor belt (1) moves and drives the push plate (4) of the push plate assembly (2) to move toward the dispensing end of the vending machine to push out the goods. The push plate (4) rotates to the position of releasing the conveyor belt (1), the push plate assembly (2) is in a free-moving state on the conveyor belt (1), and the push plate assembly (2) moves along the conveyor belt (1) towards the initial position of the push plate assembly (2) under the action of external force.

2. The pushing mechanism of the vending machine according to claim 1, characterized in that: The push plate assembly (2) includes a sliding seat (5), the push plate (4) is rotatably connected to the sliding seat (5), and a groove (3) is formed between the push plate (4) and the sliding seat (5).

3. The pushing mechanism of the vending machine according to claim 2, characterized in that: The sliding seat (5) is provided with a receiving groove (6) for accommodating the installation push plate (4). One end of the receiving groove (6) is provided with an open end (7) corresponding to the rotation direction of the sliding seat (5). The other end of the receiving groove (6) is provided with a continuous sealing plate (8). One end of the sealing plate (8) abuts against one inner side of the receiving groove (6), and the other end of the sealing plate (8) abuts against the other outer side of the receiving groove (6). The push plate (4) is limited to rotating between the open end (7) of the receiving groove (6) and the sealing plate (8); The sliding seat (5) has a through groove (27) corresponding to the conveyor belt (1) and a through groove (3). The outer surface of the sealing plate (8) and the outer end face of the through groove (27) are on the same plane. When the push plate (4) rotates to clamp the conveyor belt (1), it is fixed on the sealing plate (8).

4. The pushing mechanism of the vending machine according to claim 2, characterized in that: An elastic deformation fastening part (9) is provided between the push plate (4) and the sliding seat (5). When the push plate (4) rotates to the position of clamping the conveyor belt (1) and triggers the elastic deformation of the elastic deformation fastening part (9), the push plate (4) is fastened to the sliding seat (5). When the push plate (4) rotates towards the position of releasing the conveyor belt (1), the push plate (4) triggers the elastic deformation of the elastic deformation fastening part (9), and the elastic deformation fastening part (9) between the push plate (4) and the sliding seat (5) separates.

5. The pushing mechanism of the vending machine according to claim 4, characterized in that: The elastic deformation fastening part (9) includes an elastic buckle (10) disposed between the push plate (4) and the sliding seat (5) and a buckle hole (11). The buckle hole (11) is provided with a guide slope (12). The elastic buckle (10) engages or disengages from the buckle hole (11) along the guide slope (12). The sliding seat (5) is provided with a continuous sealing plate (8) at the fastening point between the push plate (4) and the sliding seat (5); the fastening hole (11) is provided on the sealing plate (8), and the elastic buckle (10) is provided on the push plate (4).

6. The pushing mechanism of the vending machine according to claim 1, characterized in that: The push plate (4) is provided with reinforcing ribs (13) to increase the mechanical strength of the push plate (4).

7. The pushing mechanism of the vending machine according to claim 1, characterized in that: The conveyor belt (1) is mounted on the support (14). The support (14) is provided with a drive roller (15) at one end of the conveyor belt (1) and a rotating roller (16) at the other end of the support (14). The conveyor belt (1) covers the drive roller (15) and the rotating roller (16). One rotating end of the drive roller (15) is connected to the drive shaft of the motor (17) so that the motor (17) drives the conveyor belt (1) to run. The push plate assembly (2) includes a sliding seat (5) which is slidably connected to the support (14).

8. The pushing mechanism of the vending machine according to claim 7, characterized in that: The support (14) is provided with a first side plate (18), a second side plate (19) and a third side plate (20), and the first side plate (18), the second side plate (19) and the third side plate (20) form an assembly cavity (21) for accommodating and installing the drive roller (15) and the motor (17).

9. The pushing mechanism of the vending machine according to claim 7, characterized in that: The support (14) is equipped with a detector (22) for detecting goods at the outlet end of the conveyor belt (1).

10. The pushing mechanism of the vending machine according to claim 7, characterized in that: The support (14) is provided with a sliding groove (23), and the sliding seat (5) is provided with a sliding foot (24) that cooperates with the sliding groove (23). The sliding seat (5) slides along the sliding groove (23), and the sliding foot (24) is limited on the sliding groove (23).

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