Computer security protection device

Abstract

The utility model provides a computer safety protection device which comprises a protection cabinet, a bottom plate is installed at the bottom of the protection cabinet, and universal wheels are installed at the bottom of the bottom plate. The movable door is installed on the front face of the protection cabinet, connecting plates are installed on the two sides of the protection cabinet, and reinforcing plates are installed on the connecting plates; and the mounting plate is mounted in the protection cabinet, a fixing seat is mounted at the top of the mounting plate, and a clamping plate is mounted in the fixing seat. The protection cabinet is installed on the top of the bottom plate, the top of the protection cabinet is of a closed structure, a computer is installed in the protection cabinet and can be well protected, and the movable door installed on the front face of the protection cabinet can rotate on the front face of the protection cabinet. Therefore, the computer can be conveniently installed in the protection cabinet or taken out from the interior of the protection cabinet, and the operation of workers is very convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of computer protection, and in particular relates to a computer safety protection device. Background Art

[0002] A computer is an electronic device that can perform various arithmetic or logical operations and can operate automatically according to a predetermined program. It consists of hardware and software: Hardware: including physical components such as the central processing unit, memory, hard disk, input and output devices; Software: refers to a collection of non-material programs such as operating systems and applications that guide the hardware to complete specific tasks. The internal electronic components of a computer are relatively fragile, and protective devices need to be provided for the computer when using it in a complex environment.

[0003] The existing patent document with announcement number CN208888716U discloses a computer security protection device, including a computer placement base plate, the upper surface of the computer placement base plate is provided with a plurality of vent holes, the outer surface of one side of the computer placement base plate is fixedly installed with a right guardrail, and the outer surface of the other side of the computer placement base plate is fixedly installed with a left guardrail. The computer security protection device described in the utility model is provided with a telescopic positioning plate, a positioning plate limit screw, a guardrail buffer sticker, a vent hole and a moisture-proof plate, which can firmly fix the placed computer host, prevent the computer host from shaking in the device, and prevent the computer host from hitting the right guardrail and the left guardrail when moving to cause scratches and deformation, better protect the computer host, increase the heat dissipation effect of the bottom of the computer host, and also provide moisture-proof protection, bringing better use prospects. However, the structure of the above-mentioned computer security protection device is too simple. When the computer is placed on the computer placement base plate, the top area of ​​the computer cannot be protected and is easily hit by external objects. Therefore, it is necessary to provide a computer security protection device to solve the above problems. Utility Model Content

[0004] The technical content of the utility model is to provide a computer security protection device.

[0005] In order to solve the above problems, the utility model provides a computer security protection device, including a protection cabinet, a bottom plate is installed at the bottom of the protection cabinet, and a universal wheel is installed at the bottom of the bottom plate; a movable door, the movable door is installed on the front of the protection cabinet, connecting plates are installed on both sides of the protection cabinet, and reinforcing plates are installed on the connecting plates; a mounting plate, the mounting plate is installed inside the protection cabinet, a fixing seat is installed on the top of the mounting plate, and a clamping plate is installed inside the fixing seat; a cooling fan, the cooling fan is installed on the inner bottom surface of the protection cabinet, and a dustproof plate is installed on the back of the protection cabinet.

[0006] As a further solution of the present invention, the front of the protection cabinet is arranged as an opening structure, and the movable door is installed on the front of the protection cabinet via a rotating structure installed on its left side. The size of the movable door is adapted to the size of the front opening of the protection cabinet, and a handle is installed on the right side of the front of the movable door, by which the movable door can be pulled to rotate on the front of the protection cabinet.

[0007] As a further solution of the present invention, the top area of ​​the base plate is larger than the bottom area of ​​the protection cabinet, and four sets of universal wheels are symmetrically installed on the bottom of the base plate, and each set of universal wheels is installed at the top corner of the bottom of the base plate, so that the four sets of universal wheels can provide mobility for the overall structure of the device.

[0008] As a further solution of the present invention, two groups of push rods are symmetrically installed on the back of the protection cabinet. Both groups of push rods are arranged as inclined structures. Both groups of push rods are connected to the protection cabinet through hinged seats. Push handles are installed on the tops of the two groups of push rods. The push handles and the two groups of push rods can be used to conveniently push the device as a whole to move.

[0009] As a further solution of the present invention, two groups of connecting plates are symmetrically installed on the bottom of both sides of the protection cabinet, and the connecting plates are arranged to be an L-shaped structure. The side surfaces of the connecting plates are fixedly connected to the side surfaces of the protection cabinet, and the bottom of the connecting plates are fixedly connected to the top of the bottom plate, so that the protection cabinet and the bottom plate can be fixedly connected through the two groups of connecting plates, and three groups of reinforcement plates are symmetrically installed on the top of each group of the connecting plates, and the reinforcement plates are arranged to be in a perpendicular position to the connecting plates, so that the self-strength of the connecting plates can be well increased through the reinforcement plates.

[0010] As a further solution of the present invention, the length and width of the mounting plate are the same as the length and width of the internal space of the protection cabinet, and four groups of support blocks are symmetrically installed at the bottom of the mounting plate. The support blocks are arranged in a right-angled triangle structure, and the top of the support block is fixedly connected to the bottom of the mounting plate, and the side of the support block is fixedly connected to the inner wall of the protection cabinet. Thus, the four groups of support blocks can provide a good supporting and fixing effect for the mounting plate installed inside the protection cabinet.

[0011] As a further solution of the utility model, two groups of slide plates are symmetrically installed on the top of the mounting plate, and slide plates are installed on the lower ends of both sides of the fixed seat. The opposite sides of the two groups of slide plates are provided with slide grooves adapted to the slide plates so that the fixed seat can be stably installed on the top of the mounting plate.

[0012] As a further solution of the present invention, the front and top of the fixed seat are arranged as open structures, two groups of clamping plates are symmetrically installed inside the fixed seat, cylinders are installed on both sides of the fixed seat, one end of the cylinder passes through a through hole opened on the side of the fixed seat and is fixedly connected to the side of the clamping plate, two groups of sliders are symmetrically installed on the back of the clamping plate, the sliders are arranged in two slide grooves opened on the inner wall of the fixed seat, and the sliders are arranged as T-shaped structures, and the slide grooves opened on the inner wall of the fixed seat are arranged as a structure compatible therewith, so that the sliders cannot laterally separate from the slide grooves opened on the inner wall of the fixed seat.

[0013] As a further solution of the utility model, a wire threading groove is provided at the upper right end of the protection cabinet, the wire threading groove is higher than the top of the fixing seat, the wire threading groove penetrates the front side of the protection cabinet, a sealing block is installed inside the wire threading groove, the width and height of the sealing block are the same as the internal width and height of the wire threading groove, plug blocks are installed on the top and bottom of the sealing block, and slots compatible with the plug blocks are provided on the top and bottom of the internal front end of the wire threading groove, so that the sealing block can be installed to the internal front end of the wire threading groove.

[0014] Compared with the related art, the computer security protection device provided by the utility model has the following beneficial effects:

[0015] 1. The utility model installs a protection cabinet on the top of the bottom plate, and the top of the protection cabinet is set as a closed structure. The computer installed in the protection cabinet can be well protected. The movable door installed on the front of the protection cabinet can be rotated on the front of the protection cabinet to install the computer into the protection cabinet or take the computer out of the protection cabinet, which is very convenient for the staff to operate.

[0016] 2. The utility model installs a fixing base inside the protection cabinet, and two groups of clamping plates are symmetrically installed inside the fixing base. The two groups of clamping plates can fix the computer placed in the fixing base inside the fixing base to prevent the computer from detaching from the fixing base. The clamping plates can be driven to move inside the fixing base by a cylinder, so that the spacing between the two groups of clamping plates can be changed, so that computers of different sizes can be fixed inside the fixing base.

[0017] 3. The utility model provides heat dissipation holes on the bottom of the fixing seat and the mounting plate. The heat dissipation holes on the fixing seat and the mounting plate are in corresponding position structures, so that the heat generated by the bottom of the computer can be evacuated to the internal bottom space of the protection cabinet. The heat dissipation fan installed on the internal bottom surface of the protection cabinet can dissipate the heat and discharge it to the outside of the protection cabinet through the heat dissipation grooves provided on the dustproof plate, thereby avoiding the heat generated by the computer from accumulating in large quantities inside the protection cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0019] Figure 1 This is a top view of a three-dimensional structure diagram of a computer security protection device of the utility model;

[0020] Figure 2 This is a side view of a three-dimensional structure diagram of a computer security protection device of the utility model;

[0021] Figure 3 This is a bottom-up three-dimensional structural diagram of a computer security protection device of the utility model;

[0022] Figure 4 This is a schematic diagram of the back structure of a protection cabinet of a computer security protection device of the utility model;

[0023] Figure 5 This is a schematic diagram of the internal structure of a protection cabinet of a computer security protection device of the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of a fixing seat of a computer security protection device of the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of a clamping plate of a computer security protection device of the utility model;

[0026] Figure 8 The utility model is a schematic diagram of a sealing block structure of a computer security protection device.

[0027] In the figure: 1. protection cabinet; 2. bottom plate; 3. universal wheel; 4. movable door; 5. connecting plate; 6. reinforcement plate; 7. mounting plate; 8. fixing seat; 9. clamping plate; 10. cooling fan; 11. dustproof plate; 12. push rod; 13. push handle; 14. support block; 15. slide plate; 16. slide plate; 17. cylinder; 18. slide block; 19. threading groove; 20. sealing block; 21. plug block. DETAILED DESCRIPTION

[0028] Please refer to Figure 1-8 A computer security protection device comprises a protection cabinet 1, a bottom plate 2 is installed at the bottom of the protection cabinet 1, and a universal wheel 3 is installed at the bottom of the bottom plate 2; a movable door 4 is installed on the front of the protection cabinet 1, connecting plates 5 are installed on both sides of the protection cabinet 1, and reinforcing plates 6 are installed on the connecting plates 5; a mounting plate 7 is installed inside the protection cabinet 1, a fixing seat 8 is installed on the top of the mounting plate 7, and a clamping plate 9 is installed inside the fixing seat 8; a heat dissipation fan 10 is installed on the inner bottom surface of the protection cabinet 1, and a dustproof plate 11 is installed on the back of the protection cabinet 1.

[0029] Preferably, the front of the protection cabinet 1 is set as an open structure, and the movable door 4 is installed on the front of the protection cabinet 1 through a rotating structure installed on the left side thereof. The size of the movable door 4 is adapted to the size of the front opening of the protection cabinet 1, and the protection cabinet 1 can be closed by the movable door 4, thereby preventing foreign debris from entering the interior of the protection cabinet 1. A handle is installed on the right side of the front of the movable door 4, and the movable door 4 can be pulled by the handle to rotate on the front of the protection cabinet 1, so as to realize the opening and closing of the protection cabinet 1;

[0030] Preferably, the top area of ​​the bottom plate 2 is larger than the bottom area of ​​the protection cabinet 1, so that a certain protection effect can be provided for the bottom structure of the protection cabinet 1. Four sets of universal wheels 3 are symmetrically installed at the bottom of the bottom plate 2, and each set of universal wheels 3 is installed at the top corner of the bottom of the bottom plate 2. Thus, the four sets of universal wheels 3 can provide mobility for the overall structure of the device, so that the staff can move the device;

[0031] Preferably, two groups of push rods 12 are symmetrically installed on the back of the protection cabinet 1, and the two groups of push rods 12 are set to an inclined structure. The two groups of push rods 12 are connected to the protection cabinet 1 through a hinge seat, and push handles 13 are installed on the top of the two groups of push rods 12. The push handles 13 and the two groups of push rods 12 can be used to easily push the device as a whole to move. At the same time, the push rods 12 connected and installed through the hinge seat can freely adjust the tilt angle, so that the push rods 12 can be adjusted to a vertical upward angle after use, which is convenient for reducing the space occupied by the device;

[0032] Preferably, two groups of connecting plates 5 are symmetrically installed at the bottom of both sides of the protection cabinet 1, and the connecting plates 5 are set to an L-shaped structure. The side of the connecting plate 5 is fixedly connected to the side of the protection cabinet 1, and the bottom of the connecting plate 5 is fixedly connected to the top of the bottom plate 2, so that the protection cabinet 1 and the bottom plate 2 can be fixedly connected through the two groups of connecting plates 5, and three groups of reinforcing plates 6 are symmetrically installed on the top of each group of connecting plates 5. The reinforcing plates 6 are set to be in a perpendicular position relationship with the connecting plates 5, and then the self-strength of the connecting plates 5 can be well increased by the reinforcing plates 6, so as to avoid the connection plates 5 from breaking due to excessive lateral force during daily use;

[0033] Preferably, the length and width of the mounting plate 7 are the same as the length and width of the inner space of the protection cabinet 1. Four groups of support blocks 14 are symmetrically installed at the bottom of the mounting plate 7. The support blocks 14 are arranged in a right-angled triangle structure. The top of the support block 14 is fixedly connected to the bottom of the mounting plate 7. The side of the support block 14 is fixedly connected to the inner wall of the protection cabinet 1. Thus, the four groups of support blocks 14 can provide a good supporting and fixing effect for the mounting plate 7 installed inside the protection cabinet 1, thereby preventing the mounting plate 7 from falling due to the excessive gravity of the computer placed on the top of the mounting plate 7.

[0034] Preferably, two groups of slide plates 15 are symmetrically installed on the top of the mounting plate 7, and slide plates 16 are installed on the lower ends of both sides of the fixing seat 8. The two groups of slide plates 15 have slide grooves adapted to the slide plates 16 on opposite sides, and the fixing seat 8 can be stably installed on the top of the mounting plate 7 by installing the two groups of slide plates 16 into the slide grooves opened on the two groups of slide plates 15. The computer can be placed inside the fixing seat 8, so that the computer is placed on the top of the mounting plate 7;

[0035] Preferably, the front and top of the fixing seat 8 are both set as open structures, and two groups of clamping plates 9 are symmetrically installed inside the fixing seat 8. Cylinders 17 are installed on both sides of the fixing seat 8. One end of the cylinder 17 passes through the through hole opened on the side of the fixing seat 8 and is fixedly connected to the side of the clamping plate 9, and then the clamping plate 9 can be pushed to move by the cylinder 17. The two groups of cylinders 17 can push the two groups of clamping plates 9 closer to each other, and then the computer can be fixed in the internal space of the fixing seat 8 by clamping. When the computer needs to be taken out from the internal space of the fixing seat 8, it is only necessary to drive the two groups of clamping plates 9 away from each other through the two groups of cylinders 17, and then pull the fixing seat 8 toward the outside of the protective cabinet 1 along the two groups of slide plates 15. The computer can be taken out from the inside of the fixing seat 8. Two groups of sliders 18 are symmetrically installed on the back of the clamping plate 9. The sliders 18 are set in two slide grooves opened on the inner wall of the fixing seat 8, and the sliders 18 are set to a T-shaped structure. The slide grooves opened on the inner wall of the fixing seat 8 are set to a structure adapted thereto, so that the sliders 18 cannot be laterally separated from the slide grooves opened on the inner wall of the fixing seat 8, and the two groups of clamping plates 9 cannot be laterally separated from the fixing seat 8, so that the vertical downward gravity of the clamping plate 9 can be transmitted to the overall structure of the fixing seat 8 through the two groups of sliders 18 installed on the back thereof, so as to avoid the connection between the clamping plate 9 and the cylinder 17 from being subjected to excessive vertical stress, thereby ensuring the connection stability between the clamping plate 9 and the cylinder 17;

[0036] Preferably, a threading groove 19 is provided at the upper right end of the protection cabinet 1. The threading groove 19 is higher than the top of the fixing seat 8. The cables connected to the computer installed inside the fixing seat 8 can extend to the outside of the protection cabinet 1 through the threading groove 19. The threading groove 19 penetrates the front of the protection cabinet 1. When taking the computer out of the protection cabinet 1, there is no need to unplug all the cables connected to the computer first. The cables will leave the protection cabinet 1 synchronously along the threading groove 19, saving the time required for the staff to operate. A sealing block 20 is installed inside the threading groove 19. The width and height of the sealing block 20 are the same as the internal width and height of the wire threading groove 19. Insertion blocks 21 are installed on the top and bottom of the sealing block 20. Slots compatible with the insertion blocks 21 are opened at the top and bottom of the internal front end of the wire threading groove 19, so that the sealing block 20 can be installed to the internal front end of the wire threading groove 19. At this time, the sealing block 20 can play the role of closing the wire threading groove 19 to prevent the cables in the wire threading groove 19 from falling out of the wire threading groove 19 laterally. At the same time, the sealing block 20 can also play the role of supporting the wire threading groove 19 to strengthen the overall structure of the protective cabinet 1.

[0037] Example 1: Please refer to Figure 5 and Figure 6 A heat dissipation hole is opened at the bottom of the fixing seat 8, and the heat dissipation hole penetrates the bottom of the fixing seat 8, and the range of the heat dissipation hole opened on the top of the fixing seat 8 is equivalent to the bottom area of ​​the fixing seat 8, so that the heat dissipation holes opened at the bottom of the fixing seat 8 can provide good heat dissipation for the computer installed inside the fixing seat 8, so that the heat generated at the bottom of the computer can escape through the heat dissipation holes opened at the bottom of the fixing seat 8.

[0038] Example 2: Please refer to Figure 6 The mounting plate 7 is provided with heat dissipation holes, and the heat dissipation holes on the mounting plate 7 and the heat dissipation holes on the bottom of the fixing seat 8 are in a one-to-one corresponding positional relationship, so that the heat generated by the computer can escape through the heat dissipation holes on the fixing seat 8 and the mounting plate 7 to the internal space of the protective cabinet 1 at the bottom of the mounting plate 7.

[0039] Example 3: Please refer to Figure 5The top air outlet of the heat dissipation fan 10 installed on the inner bottom surface of the protection cabinet 1 is directly opposite to the heat dissipation holes provided on the mounting plate 7. The heat in the inner space of the protection cabinet 1 transferred to the bottom of the mounting plate 7 through the heat dissipation holes provided on the mounting plate 7 can be dispersed under the wind force of the heat dissipation fan 10. A through groove is provided on the back of the protection cabinet 1, and a dustproof plate 11 is installed in the through groove. The dustproof plate 11 is provided with a plurality of vertical heat dissipation grooves. At this time, the heat accumulated in the inner bottom space of the protection cabinet 1 can escape to the outer space of the protection cabinet 1 through the heat dissipation grooves provided on the dustproof plate 11 under the wind force of the heat dissipation fan 10, thereby realizing the heat dissipation. The heat dissipation grooves provided on the dustproof plate 11 The width is narrow, which can prevent a large amount of dust from the outside of the protection cabinet 1 from entering the inside of the protection cabinet 1 without affecting the heat dissipation effect. Four groups of protrusions are symmetrically installed on the top and bottom of the dustproof plate 11, and the top and bottom of the through groove opened on the back of the protection cabinet 1 are provided with card slots adapted to the protrusions, and the thickness of the protrusion is half the thickness of the dustproof plate 11. Similarly, the card slots opened at the top and bottom of the through groove opened on the back of the protection cabinet 1 do not penetrate the protection cabinet 1, so that the dustproof plate 11 can be installed from the outside into the through groove opened on the back of the protection cabinet 1. Due to the presence of four groups of protrusions, the dustproof plate 11 will not enter the internal space of the protection cabinet 1, thereby providing a stable installation effect for the dustproof plate 11.

[0040] The standard parts used in this embodiment can be purchased directly from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the components known to technical personnel in this field, their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0041] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations or direct or indirect applications may be made to these embodiments without departing from the principles and spirit of the present invention. In other related technical fields, the scope of the present invention is defined by the attached claims and their equivalents, which are equally included in the scope of patent protection of the present invention.

Claims

1. A computer security protection device, comprising a protection cabinet (1), wherein a bottom plate (2) is installed at the bottom of the protection cabinet (1), characterized in that: A universal wheel (3) is installed at the bottom of the base plate (2); A movable door (4), the movable door (4) being installed on the front side of the protection cabinet (1), connecting plates (5) being installed on both sides of the protection cabinet (1), and reinforcing plates (6) being installed on the connecting plates (5); A mounting plate (7), the mounting plate (7) being mounted inside the protection cabinet (1), a fixing seat (8) being mounted on the top of the mounting plate (7), and a clamping plate (9) being mounted inside the fixing seat (8); A heat dissipation fan (10) is installed on the inner bottom surface of the protection cabinet (1), and a dustproof plate (11) is installed on the back of the protection cabinet (1).

2. A computer security protection device according to claim 1, characterized in that: The front of the protection cabinet (1) is arranged as an opening structure, the movable door (4) is installed on the front of the protection cabinet (1) via a rotating structure installed on the left side thereof, the size of the movable door (4) is adapted to the size of the front opening of the protection cabinet (1), and a handle is installed on the right side of the front of the movable door (4).

3. A computer security protection device according to claim 1, characterized in that: The top area of ​​the bottom plate (2) is larger than the bottom area of ​​the protection cabinet (1), and four sets of universal wheels (3) are symmetrically installed at the bottom of the bottom plate (2), and each set of universal wheels (3) is installed at the top corner of the bottom of the bottom plate (2).

4. A computer security protection device according to claim 1, characterized in that: Two groups of push rods (12) are symmetrically installed on the back of the protection cabinet (1), and the two groups of push rods (12) are both arranged as inclined structures. The two groups of push rods (12) are connected to the protection cabinet (1) through hinged seats, and push handles (13) are installed on the tops of the two groups of push rods (12).

5. A computer security protection device according to claim 1, characterized in that: Two groups of connecting plates (5) are symmetrically installed at the bottom of both sides of the protection cabinet (1), and the connecting plates (5) are arranged in an L-shaped structure. The side of the connecting plate (5) is fixedly connected to the side of the protection cabinet (1), and the bottom of the connecting plate (5) is fixedly connected to the top of the bottom plate (2), so that the protection cabinet (1) and the bottom plate (2) can be fixedly connected by the two groups of connecting plates (5), and three groups of reinforcing plates (6) are symmetrically installed on the top of each group of connecting plates (5), and the reinforcing plates (6) are arranged in a vertical position relationship with the connecting plates (5).

6. A computer security protection device according to claim 1, characterized in that: The length and width of the mounting plate (7) are the same as the length and width of the internal space of the protection cabinet (1); four groups of support blocks (14) are symmetrically mounted on the bottom of the mounting plate (7); the support blocks (14) are arranged in a right-angled triangle structure; the top of the support block (14) is fixedly connected to the bottom of the mounting plate (7); and the side of the support block (14) is fixedly connected to the inner wall of the protection cabinet (1).

7. A computer security protection device according to claim 1, characterized in that: Two groups of slide slot plates (15) are symmetrically mounted on the top of the mounting plate (7), and slide plates (16) are mounted on the lower ends of both sides of the fixing seat (8), and slide slots matching the slide plates (16) are provided on opposite sides of the two groups of slide slot plates (15).

8. A computer security protection device according to claim 1, characterized in that: The front and top of the fixing seat (8) are both arranged as open structures. Two groups of clamping plates (9) are symmetrically installed inside the fixing seat (8). Cylinders (17) are installed on both sides of the fixing seat (8). One end of the cylinder (17) passes through a through hole opened on the side of the fixing seat (8) and is fixedly connected to the side of the clamping plate (9). Two groups of sliding blocks (18) are symmetrically installed on the back of the clamping plate (9). The sliding blocks (18) are arranged in two sliding grooves opened on the inner wall of the fixing seat (8). The sliding blocks (18) are arranged as T-shaped structures. The sliding grooves opened on the inner wall of the fixing seat (8) are arranged as structures adapted thereto.

9. A computer security protection device according to claim 1, characterized in that: A threading groove (19) is provided at the upper right end of the protection cabinet (1), the threading groove (19) is higher than the top of the fixing seat (8), the threading groove (19) penetrates the front of the protection cabinet (1), a sealing block (20) is installed inside the threading groove (19), the width and height of the sealing block (20) are the same as the internal width and height of the threading groove (19), the top and bottom of the sealing block (20) are both installed with plug-in blocks (21), and the top and bottom of the internal front end of the threading groove (19) are both provided with slots adapted to the plug-in blocks (21).

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