Data transmission box

Abstract

The utility model provides a data transmission box, which comprises a shell, a read-write assembly and a magnetic attraction assembly, and is characterized in that the shell is provided with a mounting cavity, and the shell is provided with a card slot and a first opening; the read-write assembly comprises a circuit board, a connector and a data transmission interface, the circuit board is arranged in the mounting cavity, the connector is connected to the circuit board, the connector is provided with a clamping groove, the clamping groove is communicated with the card slot, the data transmission interface is connected to the circuit board, and one end of the data transmission interface is exposed out of the first opening; the magnetic attraction assembly is installed on the shell so that the shell can be magnetically attracted to the attracted object. When a user inserts a memory card into the card slot through the card slot and electrically connects the data transmission interface of the data transmission box with the electronic equipment, the data transmission process is realized, and in the process of meeting data transmission, the data transmission box has a magnetic attraction function, so that the multifunctionality of the data transmission box is increased; therefore, the use of a user is greatly facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic device accessories, and particularly relates to a data transmission box. Background Art

[0002] In daily life such as work, study, shooting, etc., people need to use various electronic devices such as mobile phones, computers, cameras, etc. to process various materials, such as documents, videos, photos, etc., making the amount of data generated increasing. Therefore, people will store data through some storage modules, such as solid-state drives, SD cards, TF cards, etc., and then access the data through a data transmission box equipped with a storage module. When in use, the user can connect the data transmission box to the electronic device through a data cable to achieve data transmission. However, the current data transmission box mainly satisfies the data transmission function, with relatively single functions, thus making the use experience in daily life relatively inconvenient. Summary of the Utility Model

[0003] The main purpose of this application is to provide a data transmission box, aiming to solve the technical problem that the current data transmission box in the prior art mainly satisfies the data transmission function, with relatively single functions, thus making the use experience in daily life relatively inconvenient.

[0004] To solve the above technical problem, the technical solution provided by the present invention is as follows:

[0005] A data transmission box, comprising:

[0006] A housing having an installation cavity, and the housing is provided with an insertion slot and a first opening;

[0007] A reading and writing component, including a circuit board, a connector, and a data transmission interface. The circuit board is disposed in the installation cavity, the connector is connected to the circuit board, and the connector has a card slot, the card slot communicates with the insertion slot, and the data transmission interface is connected to the circuit board and one end thereof is exposed at the first opening;

[0008] A magnetic attraction component installed on the housing to enable the housing to be magnetically attracted to an object to be attracted.

[0009] In some embodiments, both the connector and the insertion slot include a plurality of them. Each connector is provided with at least one card slot. The plurality of connectors include a first connector and a second connector, and the plurality of insertion slots include a first insertion slot and a second insertion slot. The first connector and the second connector are both connected to the circuit board, and the first insertion slot and the second insertion slot are disposed on the housing to communicate with the card slots of the first connector and the second connector respectively.

[0010] In some embodiments, the circuit board includes a first mounting side and a second mounting side opposite to each other. The first connector and the data transmission interface are connected to the first mounting side, and the second connector is connected to the second mounting side.

[0011] In some embodiments, the reading and writing component further includes a hard disk mounting seat, which is connected to the circuit board, and the hard disk mounting seat includes a hard disk mounting slot.

[0012] In some embodiments, the housing includes fixing posts. A through hole is formed at one end of the circuit board away from the hard disk mounting seat. The fixing posts protrude towards the circuit board to pass through the through hole, and are used for limiting the hard disk when the hard disk is inserted into the hard disk mounting slot.

[0013] In some embodiments, the data transmission box further includes a cooling fan. The housing includes a first side surface, a second side surface, and a circumferential surface. The circumferential surface is located between the first side surface and the second side surface. The magnetic attraction component is mounted on most of the second side surface. The cooling fan is arranged in the installation cavity. At least one air inlet is formed on the first side surface, and at least one air outlet is formed on the first side surface and / or the circumferential surface. The air inlet and the air outlet are both communicated with the installation cavity.

[0014] In some embodiments, the housing includes a plurality of guide vanes. The installation cavity includes a first cavity and a second cavity. The circuit board is installed in the first cavity. The guide vanes are connected to the cavity wall of the second cavity to form a plurality of guide air ducts capable of communicating with the air outlet.

[0015] In some embodiments, one ends of the plurality of guide vanes away from the air outlet are arranged around the cooling fan to form an installation slot for accommodating the cooling fan. The wind force of the cooling fan can blow towards the air outlet along the guide air duct.

[0016] In some embodiments, a part of the guide vanes close to the first cavity are oppositely arranged on two sides of the fan, and one ends of the part of the guide vanes away from the air outlet are oppositely arranged to form an air passing duct.

[0017] In some embodiments, the magnetic attraction component includes a magnet and a cover body. The cover body covers the second side surface, and the magnet is arranged between the cover body and the second side surface.

[0018] In some embodiments, the housing includes a first housing and a second housing. The first housing and the second housing can enclose to form an installation cavity. A clamping groove is arranged at one end of one of the first housing and the second housing, and a clamping buckle capable of being clamped in the clamping groove is arranged at the other end. The other ends of the first housing and the second housing are connected by screws.

[0019] Beneficial effects:

[0020] In this application, a data transmission box is provided. When the user inserts the memory card into the card slot through the card insertion opening and electrically connects the data transmission interface of the data transmission box to the electronic device to achieve the data transmission process, during the process of satisfying data transmission, the data transmission box in this article has a magnetic attraction function, which increases the versatility of the data transmission box, thus greatly facilitating the use of the user. Brief description of the drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0022] Figure 1 It is a schematic structural diagram of the data transmission box in an embodiment.

[0023] Figure 2 It is another schematic structural diagram of the data transmission box in an embodiment.

[0024] Figure 3 It is an exploded structural diagram of the data transmission box in an embodiment.

[0025] Figure 4 It is another exploded structural diagram of the data transmission box in an embodiment.

[0026] Figure 5 It is a schematic structural diagram of the second housing in an embodiment.

[0027] Figure 6 It is a schematic structural diagram of the first housing in an embodiment.

[0028] Figure 7 It is a schematic structural diagram of the data transmission box with a memory card inserted in an embodiment.

[0029] Icon description:

[0030] 10. Data transmission box; 20. Memory card;

[0031] 1. Housing; 11. Installation cavity; 111. First cavity; 112. Second cavity; 12. Card slot; 121. First card slot; 122. Second card slot; 13. First opening; 14. Second opening; 15. Fixed column; 16. First housing; 161. First side; 162. Air inlet; 163. Buckle; 17. Second housing; 171. Second side; 172. Deflector; 1721. Installation groove; 1722. Deflection air duct; 1723. Through air duct; 173. Clamping groove; 174. Accommodation groove; 18. Circumferential surface; 181. Air outlet;

[0032] 2. Reading and writing component; 21. Circuit board; 211. First installation side; 212. Second installation side; 213. Through hole; 22. Connector; 221. First connector; 222. Second connector; 223. Card slot; 23. Data transmission interface; 24. Hard disk mounting seat; 241. Hard disk mounting groove;

[0033] 3. Magnetic attraction component; 31. Magnet; 32. Cover body;

[0034] 4. Cooling fan;

[0035] 5. Power supply interface;

[0036] 6. Indicator light.

[0037] The realization of the purpose, functional features and advantages of this application will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of this application will be clearly and completely described with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0039] It should be noted that all the directional indications (such as up, down, left, right, front, back,...) in the embodiments of this application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0040] In addition, the descriptions involving "first", "second", etc. in this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, "and / or" throughout the text includes three scenarios. Taking A and / or B as an example, it includes the technical solution of A, the technical solution of B, and the technical solution where both A and B are satisfied; in addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0041] Please refer to Figures 1-7 , this article provides a data transmission box 10, which has a reading or writing function and can be regarded as a reading and writing device. It includes a housing 1, a reading and writing component 2, and a magnetic attraction component 3. The housing 1 has an installation cavity 11, and the housing 1 is provided with a card slot 12 and a first opening 13; the reading and writing component 2 includes a circuit board 21, a connector 22, and a data transmission interface 23. The circuit board 21 is disposed in the installation cavity 11, the connector 22 is connected to the circuit board 21, and the connector 22 has a card slot 223, and the card slot 223 communicates with the card slot 12. The data transmission interface 23 is connected to the circuit board 21, and one end is exposed at the first opening 13; the magnetic attraction component 3 is installed on the housing 1 so that the housing 1 can be magnetically attracted to the object to be attracted.

[0042] As described above, please refer to Figures 1-2 , Figure 7, this article provides a data transfer box 10. When the user inserts the memory card 20 into the card slot 223 through the card insertion opening 12 and electrically connects the data transfer interface 23 of the data transfer box 10 to an electronic device to realize the data transfer process. During the process of meeting the data transfer requirements, the data transfer box 10 in this article has a magnetic attraction function, which increases the versatility of the data transfer box 10 and greatly facilitates the use of the user. For example, the user can magnetically attract the data transfer box 10 to an electronic device such as a mobile phone through the magnetic attraction component 3, or when in use, can magnetically attract a radiator, etc. It should be noted that the data transfer interface 23 is electrically connected to the circuit board 21, and the connector 22 is electrically connected to the circuit board 21. The data transfer interface 23 can be electrically connected to an electronic device through a data cable, and the data transfer interface 23 can realize the power supply function of the data transfer box 10. When the data transfer interface 23 is electrically connected to an electronic device, the electronic device can supply power to each electronic component in the data transfer box 10; the memory card 20 can include, but is not limited to, a TF card, an SD card, etc. When the memory card 20 is inserted into the card slot 223, the controller of the memory card 20 can communicate with the circuit board 21 of the data transfer box 10 to complete reading or writing data. The data transfer interface 23 can be a Type-C interface.

[0043] On the other hand, please refer to Figure 4 , the reading and writing component 2 of this article further includes a hard disk mounting seat 24 for mounting a hard disk. The hard disk mounting seat 24 is electrically connected to the circuit board 21, and the hard disk mounting seat 24 includes a hard disk mounting slot 241 for inserting the hard disk. The user can also choose to insert the hard disk into the hard disk mounting slot 241 and electrically connect the data transfer interface 23 of the data transfer box 10 to an electronic device through a data cable to realize data transfer between the electronic device and the hard disk. With such a setting, the data transfer box 10 in this article can realize reading and writing of multiple storage objects such as a hard disk, a TF card, an SD card, etc., thus meeting the multiple functional requirements of the user. In addition, the housing 1 of this article has a magnetic attraction component 3, and the housing 1 can be magnetically attracted to a mobile phone through the magnetic attraction component 3. In this way, when the user uses the hard disk to transfer data, the user can also operate the mobile phone more conveniently, such as holding the mobile phone for shooting, recording while storing, etc. It should be noted that the above is described by taking a mobile phone as an example, and the electronic device can also include a notebook, a tablet computer, a game console, etc. The hard disk can include a solid state drive.

[0044] For the reading and writing of TF cards and SD cards, there are multiple connectors 22 and card slots 12 in this embodiment. Each connector 22 is provided with at least one card slot 223. The multiple connectors 22 include a first connector 221 and a second connector 222. The first connector 221 is used for inserting a TF card, and the second connector 222 is used for inserting an SD card. The multiple card slots 12 include a first card slot 121 and a second card slot 122. Both the first connector 221 and the second connector 222 are connected to the circuit board 21. The first card slot 121 and the second card slot 122 are arranged on the housing 1 to communicate with the card slot 223 of the first connector 221 and the card slot 223 of the second connector 222 respectively, so that the TF card is inserted into the card slot 223 of the first connector 221 through the first card slot 121, and the SD card is inserted into the card slot 223 of the second connector 222 through the second card slot 122. That is, the first connector 221 is a TF connector 22, and the second connector 222 is an SD connector 22. Specifically, the circuit board 21 includes a first mounting side 211 and a second mounting side 212 facing away from each other. The first connector 221 and the data transmission interface 23 are connected to the first mounting side 211, and the second connector 222 is connected to the second mounting side 212, so as to make full use of the space of the installation cavity 11 of the data transmission box 10. It can be understood that in some other solutions, there may also be a third connector, and the third connector also has a card slot. There may also be a third card slot on the housing 1 for inserting other memory cards, such as CF cards.

[0045] For the installation of the hard disk, please refer to Figure 3 , in this embodiment, the housing 1 includes fixing posts 15. A through hole 213 is opened at one end of the circuit board 21 away from the hard disk mounting seat 24. The fixing posts 15 protrude from the second mounting side 212 of the circuit board 21 towards the first mounting side 211 of the circuit board 21 to pass through the through hole 213, and are used for limiting the hard disk when the hard disk is inserted into the hard disk mounting groove 241. Generally, the hard disk has a limiting hole at one end. During installation, the user can insert one end of the hard disk into the hard disk mounting groove 241, and the limiting hole at the other end is clamped with the fixing post 15, and then locked to the fixing post 15 with screws. Thus, the hard disk is installed and locked. When disassembling, the screws can be loosened to release the locking of the hard disk, so that the hard disk can be taken out from the hard disk mounting groove 241.

[0046] There can be multiple fixing posts 15. Taking two as an example in this article, the two fixing posts 15 are at different distances from the specific hard disk mounting seat 24, so as to be able to match different models of hard disks and increase the applicability of the data transmission box 10 in this article.

[0047] Please refer to Figures 2-4, in this embodiment, the data transmission box 10 further includes a cooling fan 4. The housing 1 includes a first side surface 161, a second side surface 171, and a circumferential surface 18. The circumferential surface 18 is located between the first side surface 161 and the second side surface 171. The cooling fan 4 is disposed in the installation cavity 11. At least one air inlet 162 is formed on the first side surface 161, and at least one air outlet 181 is formed on the first side surface 161 and / or the circumferential surface 18. Both the air inlet 162 and the air outlet 181 communicate with the installation cavity 11. In this embodiment, by providing the cooling fan 4, the air inlet 162, and the air outlet 181, the air inside and outside the housing 1 can be driven to flow to form a wind force, thereby taking out the heat generated by the hard disk, TF card, SD card, or other electronic components during use, and preventing the internal components from being damaged due to overheating.

[0048] In this embodiment, when the user electrically connects the data transmission interface 23 to the electronic device, the electronic device can supply power to the data transmission box 10, enabling the circuit board 21, the cooling fan 4, the hard disk mount 24, the connector 22, etc. in the data transmission box 10 to be powered on, and further enabling the data of the hard disk or the memory card 20 to be read or written.

[0049] Please refer to Figure 3 , in some embodiments, a power supply interface 5 is further electrically connected to the circuit board 21, and a second opening 14 is further formed on the housing 1. One end of the power supply interface 5 is electrically connected to the circuit board 21, and the other end is exposed at the second opening 14. With such a setting, the user can also externally connect an external power supply through the power supply interface 5, and the external power supply can supply power to each electronic component in the data transmission box 10. Further, the data transmission box 10 can also supply power to the electronic device through the data transmission interface 23. Specifically, the power supply interface 5 can be a Type-C interface.

[0050] More specifically, please refer to Figures 3-6 , the housing 1 includes a plurality of guide vanes 172, the installation cavity 11 includes a first cavity 111 and a second cavity 112, the circuit board 21 is installed in the first cavity 111, and the guide vanes 172 are connected to the cavity wall of the second cavity 112, and can divide the air outlet 181 communicating with the second cavity 112 into a plurality of air outlets 181. In this way, the uniformity of the wind force is increased. Specifically, the guide vanes 172 can be provided on both the cavity wall of the second cavity 112 with the air inlet 162 and the cavity wall away from the air inlet 162 to form a plurality of guide air ducts 1722.

[0051] A plurality of guide pieces 172 are arranged around the heat dissipation fan 4 at one end away from the air outlet 181 to form a mounting groove 1721 for accommodating the heat dissipation fan 4, and a guide air duct 1722 is formed between two adjacent guide pieces 172 to guide the wind force of the fan. With such an arrangement, the fan can directly guide the air in the housing 1 to the plurality of guide air ducts 1722, and further blow it out from the air outlet 181, so as to effectively dissipate the heat of the electronic components in the housing 1. On the other hand, part of the guide pieces 172 close to the first cavity 111 are relatively arranged on two sides of the fan, and part of the guide pieces 172 are relatively arranged at one end away from the air outlet 181 to form an air duct 1723, which can make the air in the first cavity 111 and the second cavity 112 flow, so that the heat in the second cavity 112 can also be blown out of the housing 1.

[0052] Specifically, please participate Figures 5-6 The shell 1 includes a first shell 16 and a second shell 17. The first side surface 161 is located in the first shell 16, and the second side surface 171 is located in the second shell 17. The circumferential side surfaces of the first shell 16 and the second shell 17 are both the circumferential surface 18 of the shell 1. The air inlet 162 and part of the air outlet 181 are opened in the first shell 16. The second card insertion port 122 is opened in the second shell 17. The first shell 16 and the second shell 17 can be surrounded by a first opening 13, a second opening 14, and a first card insertion port 121. The second shell 17 and the first shell 16 are both connected with a guide plate 172 on the side facing each other. The first shell 16 and the second shell 17, a mounting cavity 11 is formed between the second shell 17, the magnetic attraction component 3 is connected to the side of the second shell 17 away from the first shell 16, one end of the first shell 16 has a buckle 163, and the corresponding position of the second shell 17 has a holding groove 173, the other ends of the first shell 16 and the second shell 17 are connected by screws. When in use, after the hard disk is installed, the buckle 163 can be clamped in the holding groove 173, and then locked to the other ends of the first shell 16 and the second shell 17 by screws; when the hard disk needs to be disassembled, the screws at one end of the first shell 16 and the second shell 17 can be unscrewed to disassemble the first shell 16 and the second shell 17.

[0053] See also Figure 4 In this embodiment, the magnetic attraction component 3 includes a magnet 31 and a cover 32. The cover 32 is provided on the side of the second housing 17 away from the first housing 16, and the magnet 31 is provided between the cover 32 and the second housing 17. Specifically, the side of the second housing 17 away from the first housing 16 has a receiving groove 174, and the magnet 31 includes a plurality of magnets 31, and the plurality of magnets 31 are received in the receiving groove 174. Specifically, the magnet 31 includes an annular magnet 31 and a magnet 31 bar located at the lower part of the annular magnet 31, which is suitable for magnetic attraction with electronic equipment.

[0054] See alsoFigure 3 , in this embodiment, a power supply interface 5 is also electrically connected to the circuit board 21, and a second opening 14 is also formed in the housing 1. One end of the power supply interface 5 is electrically connected to the circuit board 21, and the other end is exposed at the second opening 14. With such a setting, the user can externally connect an external power supply through the power supply interface 5, and the external power supply can supply power to each electronic component in the data transmission box 10. Further, the data transmission box 10 can supply power to the electronic device through the data transmission interface 23. Specifically, the power supply interface 5 can be a Type-C interface.

[0055] Please refer to the figure. In this embodiment, an indicator light 6 is also provided on the circuit board 21. The indicator light 6 is connected to the circuit board 21 and can be exposed outside the housing 1 for indicating the power supply situation.

[0056] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the specification and drawings of the present application under the concept of the present application, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A data transmission box, characterized in that, Comprising: A housing (1) having an installation cavity (11), and the housing (1) is provided with a card insertion slot (12) and a first opening (13); A reading and writing component (2), including a circuit board (21), a connector (22) and a data transmission interface (23). The circuit board (21) is disposed in the installation cavity (11), the connector (22) is connected to the circuit board (21), and the connector (22) has a card slot (223). The card slot (223) communicates with the card insertion slot (12), and the data transmission interface (23) is connected to the circuit board (21) and one end thereof is exposed at the first opening (13); A magnetic attraction component (3) installed on the housing (1) so that the housing (1) can be magnetically attracted to an object to be attracted.

2. The data transmission box according to claim 1, wherein Both the connector (22) and the card insertion slot (12) include a plurality of them. Each connector (22) is provided with at least one card slot (223). The plurality of connectors (22) include a first connector (221) and a second connector (222). The plurality of card insertion slots (12) include a first card insertion slot (121) and a second card insertion slot (122). The first connector (221) and the second connector (222) are both connected to the circuit board (21). The first card insertion slot (121) and the second card insertion slot (122) are disposed on the housing (1) to communicate with the card slot (223) of the first connector (221) and the card slot (223) of the second connector (222) respectively.

3. The data transmission box according to claim 2, characterized in that The circuit board (21) includes a first installation side (211) and a second installation side (212) facing away from each other. The first connector (221) and the data transmission interface (23) are connected to the first installation side (211), and the second connector (222) is connected to the second installation side (212).

4. The data transmission box according to any one of claims 1 to 3, characterized in that, The reading and writing component (2) further includes a hard disk mounting seat (24). The hard disk mounting seat (24) is connected to the circuit board (21), and the hard disk mounting seat (24) includes a hard disk mounting groove (241).

5. The data transmission box according to claim 4, characterized in that, The housing (1) includes a fixing post (15). One end of the circuit board (21) away from the hard disk mounting seat (24) is provided with a through hole (213). The fixing post (15) protrudes towards the circuit board (21) to pass through the through hole (213) for limiting the hard disk when the hard disk is inserted into the hard disk mounting groove (241).

6. The data transmission box according to any one of claims 1 to 3, characterized in that, The data transmission box further includes a cooling fan (4). The housing (1) includes a first side surface (161), a second side surface (171), and a circumferential surface (18). The circumferential surface (18) is located between the first side surface (161) and the second side surface (171). The magnetic attraction assembly (3) is installed on the second side surface (171). The cooling fan (4) is disposed in the installation cavity (11). At least one air inlet (162) is formed in the first side surface (161). At least one air outlet (181) is formed in the first side surface (161) and / or the circumferential surface (18). The air inlet (162) and the air outlet (181) are both communicated with the installation cavity (11).

7. The data transmission box according to claim 6, wherein The housing (1) includes a plurality of guide vanes (172). The installation cavity (11) includes a first cavity (111) and a second cavity (112). The circuit board (21) is installed in the first cavity (111). The guide vanes (172) are connected to the wall of the second cavity (112) to form a plurality of guide air ducts (1722) capable of communicating with the air outlet (181).

8. The data transmission box according to claim 7, characterized in that, One ends of the plurality of guide vanes (172) away from the air outlet (181) are arranged around the cooling fan (4) to form an installation groove (1721) for accommodating the cooling fan (4). The wind force of the cooling fan (4) can blow towards the air outlet (181) along the guide air ducts (1722).

9. The data transmission box according to claim 8, characterized in that Among them, some of the guide vanes (172) close to the first cavity (111) are oppositely arranged on two sides of the fan, and one ends of the some guide vanes (172) away from the air outlet (181) are oppositely arranged to form an air passing duct (1723).

10. The data transmission box according to claim 6, characterized in that, The magnetic attraction assembly (3) includes a magnet (31) and a cover body (32). The cover body (32) covers the second side surface (171). The magnet (31) is disposed between the cover body (32) and the second side surface (171).

11. The data transmission box according to claim 1, characterized in that, The housing (1) includes a first housing (16) and a second housing (17). The first housing (16) and the second housing (17) can enclose the installation cavity (11). A clamping groove (173) is formed at one end of one of the first housing (16) and the second housing (17), and a clamping buckle (163) capable of being clamped in the clamping groove (173) is formed at the other end. The other ends of the first housing (16) and the second housing (17) are connected by screws.

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