Quick disassembling mechanism for controller module

Abstract

The utility model discloses a controller module quick disassembly mechanism, which comprises a first shell and a key assembly, and the key assembly is detachably arranged on the first shell. A first sliding clamping assembly and a first clamping assembly, wherein the first sliding clamping assembly and the first clamping assembly are respectively arranged on the first shell; the key assembly comprises a second shell, a second sliding clamping assembly and a second clamping assembly, and the second sliding clamping assembly and the second clamping assembly are arranged on the second shell; the first sliding clamping assembly is matched with the second sliding clamping assembly, and the first clamping assembly is matched with the second clamping assembly, so that the key assembly can be clamped with the first shell or can be released from the first shell. The key assembly is of an integrated module structure, so that the key assembly can be integrally installed on the first shell or integrally detached from the first shell, and meanwhile, the key assembly is installed on the first shell through the two clamping assemblies, so that the key assembly is firmer in connection and not prone to loosening.

Description

Technical Field

[0001] The utility model relates to the technical field of interactive control terminals, in particular to a controller module quick-release mechanism. Background Art

[0002] A gamepad controller is a common interactive device. Users can control electronic devices by operating the buttons on the gamepad controller. As an important component of the gamepad controller, buttons are used very frequently. The common gamepad controllers on the market are usually standard gamepads. The main body of the standard gamepad is fixed with a left joystick, a right joystick, a cross direction key, a back button and A / B / X / Y buttons. This standard gamepad can basically meet most operation and control needs.

[0003] With the rapid development of electronic control terminals, the interaction methods are becoming increasingly complex, and users have higher and higher requirements for the handle experience. As a result, refittable handle buttons have appeared on the market, and users can replace the button components according to their own needs. However, most traditional refittable handle button modules only replace the external contact part of the button. The button switch itself, which essentially affects the button feel, cannot be replaced, making the user experience monotonous and limiting its practicality to a certain extent. Utility Model Content

[0004] The utility model provides a controller module quick-release mechanism to solve the problem that most of the conventional convertible handle button modules only replace the contact part outside the button, and the button switch itself which essentially affects the button feel cannot be replaced, resulting in a single user experience.

[0005] A controller module quick-release mechanism provided in the present application includes: a first shell and a button assembly, wherein the button assembly is detachably mounted on the first shell; a first sliding snap-in assembly and a first snap-in assembly, wherein the first sliding snap-in assembly and the first snap-in assembly are respectively arranged on the first shell; the button assembly includes a second shell, a second sliding snap-in assembly and a second snap-in assembly, wherein the second sliding snap-in assembly and the second snap-in assembly are respectively arranged on the second shell; the first sliding snap-in assembly is adapted to the second sliding snap-in assembly, and the first snap-in assembly is adapted to the second snap-in assembly, so that the button assembly can be snapped or released with the first shell.

[0006] According to the above-mentioned technical means, the button assembly of the utility model has a second shell, and then the button assembly is an integrated module structure, so that the button assembly can be installed as a whole on the first shell, or removed as a whole from the first shell, which solves the problem that most of the traditional convertible handle button modules only replace the contact part on the outside of the button, and the button switch itself that essentially affects the feel of the button cannot be replaced, resulting in a single user experience. The user can replace the button assembly according to their own needs to experience different pressing feels.

[0007] The key assembly in the utility model is installed on the first housing through two sets of clamping assemblies, so that the key assembly is more firmly connected and not easy to loosen. At the same time, the key assembly is installed by clamping, which is easy to install and disassemble, and the user can replace the key assembly conveniently and quickly.

[0008] Furthermore, the first sliding card assembly includes a slider, which is slidably mounted on the first shell; the second sliding card assembly includes a slide groove, which is arranged on the second shell; the slider can slide into the slide groove to enable the button assembly to be engaged with the first shell, or the slider can slide out of the slide groove to release the engagement between the button assembly and the first shell.

[0009] According to the above technical means, the utility model uses a sliding clamping assembly to install the key assembly, making the installation process simple and quick. By sliding the slider, the key assembly can be easily installed in the desired position without complicated tools or cumbersome steps. In addition, once the slider is installed in place, it can fit tightly in the slide groove, providing stable support and fixation, reducing the risk of loosening and falling off, and ensuring the durability and safety of the connection.

[0010] Furthermore, a first limiting member is formed on the slide groove, and the first limiting member is used to lock the slider to prevent the slider from falling off the slide groove.

[0011] According to the above technical means, after the slider slides into place along the installation path, the first limit member can limit the position of the slider to prevent the slider from moving in the opposite direction and falling off the slide groove, causing the connection to loosen.

[0012] Furthermore, the first sliding card assembly also includes a toggle member, an elastic member and a second limiting member, the second limiting member is fixed on the first shell, and the slider is located between the second limiting member and the first shell; one end of the elastic member is fixed on the first shell, and the other end is connected to the slider; the toggle member is fixedly connected to the slider.

[0013] According to the above technical means, the second limiter in the utility model is used to limit the sliding path of the slider, prevent the slider from moving and deviating, and prevent the slider from falling off the first shell. An elastic member is connected to one end of the slider, so that the slider has a tendency to move toward the elastic member, and then when the button assembly is installed, after the slider moves to the installation position in the slide groove, it can abut against the slide groove wall under the action of the elastic member, further preventing the slider from falling off the slide groove. A toggle member is fixed on the slider, and the user can move the slider away from the elastic member by toggling the toggle member. Then, when the button assembly is disassembled, the user toggles the toggle member to move the elastic member in a direction away from the elastic member, so that the slider moves around the first limiter and slides out of the slide groove to contact and engage.

[0014] Furthermore, the second shell includes an upper shell and a lower shell, the upper shell is spliced ​​with the lower shell; the slide groove is arranged on the upper shell; and the second clamping assembly is arranged on the lower shell.

[0015] According to the above technical means, the upper shell and the lower shell in the utility model can be spliced ​​to form a cavity for accommodating to protect the electrical components of the key assembly. At the same time, the tight fit and connection between the upper shell and the lower shell make the whole structure more stable.

[0016] Furthermore, the button assembly also includes a button and a button mainboard, the button is connected to the button mainboard, and the button and the button mainboard are both installed in the second shell.

[0017] According to the above technical means, the button assembly in the utility model is an integrated module structure, and the button and the button mainboard are integrated in the upper shell and the lower shell, so that the user can simply disassemble the entire button assembly to complete the replacement.

[0018] Furthermore, a first through hole is formed on the upper shell, and at least part of the buttons can pass through the first through hole to extend out of the second shell.

[0019] Furthermore, it also includes a handle mainboard, which is installed in the first shell and can be electrically connected to the button mainboard.

[0020] Furthermore, a second through hole is formed on the lower shell; a third through hole is formed on the first shell; the second through hole corresponds to the third through hole, and at least part of the handle main board can pass through the second through hole and the third through hole to be connected to the button main board.

[0021] According to the above technical means, in the utility model, a first connector is integrated on the handle mainboard, a second connector is formed on the key mainboard, and the first connector and the second connector match to electrically connect the key assembly to the handle. To facilitate the replacement of the key assembly, a second through hole is formed on the lower shell in the utility model to expose the second connector, and a third through hole is formed on the first shell to expose the first connector. The second through hole corresponds to the third through hole, thereby facilitating the overall replacement of the key assembly and the control connection with the handle.

[0022] Furthermore, the second snap-fitting component is a buckle, and the first snap-fitting component is a slot, and the buckle can be snapped or released from the slot, so that the button assembly can be snapped or released from the first shell.

[0023] According to the above technical means, the structural design of the buckle and the slot in the utility model makes the assembly process simple and quick. The user only needs to match the buckle with the slot and complete the assembly with a light press, without the need to use additional tools or complicated operating steps, which greatly improves the assembly efficiency and saves assembly time. At the same time, the structural design of the buckle and the slot in the utility model has a locking mechanism. Once the assembly is completed, the buckle can be firmly locked in the slot and is not easy to fall off or loosen, ensuring the stability and reliability of the connection and effectively preventing equipment failure or safety hazards caused by poor connection.

[0024] Beneficial effects achieved by the utility model:

[0025] 1. The button assembly of the utility model has a second shell, and the button assembly is an integrated module structure, so that the button assembly can be installed on the first shell as a whole, or removed from the first shell as a whole, which solves the problem that most of the traditional convertible handle button modules only replace the contact part outside the button, and the button switch itself that essentially affects the button feel cannot be replaced, resulting in a single user experience. The user can replace the button assembly according to their own needs to experience different pressing feels.

[0026] 2. The key assembly in the utility model is installed on the first housing through two sets of clamping assemblies, so that the key assembly is more firmly connected and not easy to loosen. At the same time, the key assembly is installed by clamping, which is easy to install and disassemble, and the user can replace the key assembly conveniently and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an exploded schematic diagram of the overall structure of the utility model;

[0028] Figure 2 This is an exploded schematic diagram of the key assembly structure of the utility model;

[0029] Figure 3This is a structural axial view of the key assembly of the utility model;

[0030] Figure 4 This is a schematic diagram of the second housing structure of the utility model;

[0031] Figure 5 It is a partial exploded schematic diagram of the structure of the first sliding clamping assembly of the utility model;

[0032] Figure 6 This is a schematic diagram of the structure of the first sliding clamping assembly of the utility model;

[0033] Figure 7 It is a cross-sectional schematic diagram of a first sliding clamping assembly of the utility model;

[0034] Figure 8 It is a schematic cross-sectional diagram of the overall structure of the utility model;

[0035] Fig. 9 It is a schematic diagram of the assembly structure of the utility model.

[0036] Reference numerals:

[0037] 1-first shell, 11-third through hole;

[0038] 2-button assembly, 21-second housing, 211-upper housing, 2111-first through hole, 212-lower housing, 2121-second through hole, 22-second sliding card assembly, 221-slide groove, 222-first limiter, 23-second card assembly, 24-button, 25-button main board;

[0039] 3-first sliding clamping assembly, 31-sliding block, 32-moving member, 33-elastic member, 34-second limiting member;

[0040] 4-First clamping assembly.

[0041] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The same or similar numbers correspond to the same or similar parts. The terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations on this patent. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific embodiments should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0044] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0045] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0046] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0047] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0048] The technical solution of the present utility model is described in detail below in conjunction with the specific drawings.

[0049] like Figure 1-Figure 4 As shown, a controller module quick release mechanism comprises: a first housing 1 and a button assembly 2, the button assembly 2 is detachably mounted on the first housing 1; a first sliding clamping assembly 3 and a first clamping assembly 4, the first sliding clamping assembly 3 and the first clamping assembly 4 are respectively arranged on the first housing 1; Figure 2 and Figure 3As shown, the button assembly 2 includes a second shell 21, a second sliding snap-in assembly 22 and a second snap-in assembly 23, and the second sliding snap-in assembly 22 and the second snap-in assembly 23 are respectively arranged on the second shell 21; the first sliding snap-in assembly 3 is adapted to the second sliding snap-in assembly 22, and the first snap-in assembly 4 is adapted to the second snap-in assembly 23, so that the button assembly 2 can be snapped or released with the first shell 1.

[0050] The button assembly 2 of the present embodiment has a second shell 21, and thus the button assembly 2 is an integrated module structure, so that the button assembly 2 can be installed as a whole on the first shell 1, or removed as a whole from the first shell 1, which solves the problem that most of the traditional convertible handle button modules only replace the contact part outside the button, and the button switch itself that essentially affects the feel of the button cannot be replaced, resulting in a single user experience. The user can replace the button assembly 2 according to their own needs to experience different pressing feels.

[0051] The key assembly 2 in this embodiment is installed on the first housing 1 through two sets of clamping assemblies, so that the key assembly 2 is more firmly connected and not easy to loosen. At the same time, the key assembly 2 is installed by clamping, which is easy to install and disassemble, and the user can replace the key assembly 2 conveniently and quickly.

[0052] This embodiment is preferred, such as Figure 1 and Figure 4 As shown, a receiving groove is formed on the first shell 1, and the receiving groove matches the structure and size of the second shell 21, so that the key assembly 2 is installed on the first shell 1 and can form a whole with the first shell 1, thereby improving the overall aesthetics of the product (such as Fig. 9 In this embodiment, the first sliding clamping assembly 3 and the first clamping assembly 4 are respectively arranged on opposite sides of the receiving groove, and the second sliding clamping assembly 22 and the second clamping assembly 23 are respectively arranged on opposite sides of the second housing 21 to improve the installation stability of the button assembly 2.

[0053] like Figure 4-Figure 6 As shown, the first sliding clamping assembly 3 includes a slider 31, and the slider 31 is slidably arranged on the first housing 1; Figure 3As shown, the second sliding clamping assembly 22 includes a slide groove 221, and the slide groove 221 is arranged on the second shell 21; the slider 31 can slide into the slide groove 221 to clamp the key assembly 2 with the first shell 1, or the slider 31 can slide out of the slide groove 221 to release the clamping connection between the key assembly 2 and the first shell 1. This embodiment uses a sliding clamping assembly to install the key assembly 2, making the installation process simple and quick. By sliding the slider 31, the key assembly 2 can be easily installed in the desired position without complicated tools or cumbersome steps. In addition, once the slider 31 is installed in place, it can fit tightly in the slide groove 221, provide stable support and fixation, reduce the risk of loosening and falling off, and ensure the durability and safety of the connection.

[0054] like Figure 3 As shown, a first stopper 222 is formed on the slide groove 221, and the first stopper 222 is used to lock the slider 31 to prevent the slider 31 from falling off the slide groove 221. After the slider 31 slides into place along the installation path, the first stopper 222 can limit the position of the slider 31 to prevent the slider 31 from moving in the opposite direction and falling off the slide groove 221, causing the connection to become loose.

[0055] Specifically, in this embodiment, the first stopper 222 is a triangular stopper structure, the first stopper 222 is fixedly connected to the slide slot 221 (preferably, in this embodiment, the first stopper 222 and the slide slot 221 are integrally formed), one side of the first stopper 222 smoothly transitions with the side wall of the slide slot 221, and the other side is perpendicular to the slide slot 221, so as to form an installation position for the slider 31. When the button assembly 2 is installed, the slider 31 slides along the side wall of the slide slot 221 and passes through the first stopper 222 until it reaches the installation position. Since the slider 31 abuts against a side of the first stopper 222 perpendicular to the slide slot 221, the slider 31 cannot move out of the slide slot 221 without manual intervention, so as to ensure the stability of the clamping. When the button assembly 2 is disassembled, the user slides the slider 31 to make the slider 31 move around the first stopper 222 and slide out of the slide slot 221 to contact the clamping.

[0056] like Figure 4-Figure 7As shown, the first sliding clamping assembly 3 also includes a toggle member 32, an elastic member 33 and a second limiting member 34. The second limiting member 34 is fixed on the first housing 1, and the slider 31 is located between the second limiting member 34 and the first housing 1; one end of the elastic member 33 is fixed on the first housing 1, and the other end is connected to the slider 31; the toggle member 32 is fixedly connected to the slider 31. In this embodiment, the second limiting member 34 is used to limit the sliding path of the slider 31, prevent the slider 31 from moving and deviating, and prevent the slider 31 from falling off from the first housing 1. The elastic member 33 is connected to one end of the slider 31, so that the slider 31 has a tendency to move toward the elastic member 33, and then when the key assembly 2 is installed, after the slider 31 moves to the installation position in the slide groove 221, it can abut against the wall of the slide groove 221 under the action of the elastic member 33, further preventing the slider 31 from falling off from the slide groove 221. A toggle member 32 is fixed on the slider 31, and the user can move the slider 31 away from the elastic member 33 through the toggle member 32. When the button assembly 2 is disassembled, the user moves the elastic member 33 in a direction away from the elastic member 33 by toggle the toggle member 32, so that the slider 31 moves around the first limit member 222 and slides out of the slide groove 221 to contact and engage.

[0057] like Figure 1 As shown, the second housing 21 includes an upper housing 211 and a lower housing 212, the upper housing 211 and the lower housing 212 are spliced ​​together; the slide slot 221 is arranged on the upper housing 211; and the second clamping assembly 23 is arranged on the lower housing 212. In this embodiment, the upper housing 211 and the lower housing 212 are spliced ​​together to form a cavity for accommodating, so as to protect the electrical components of the key assembly 2. At the same time, the close fit and connection between the upper housing and the lower housing make the entire structure more stable.

[0058] like Figure 2 As shown, the key assembly 2 also includes a key 24 and a key mainboard 25, the key 24 is connected to the key mainboard 25, and the key 24 and the key mainboard 25 are both installed in the second housing 21. In this embodiment, the key assembly 2 is an integrated module structure, and the key 24 and the key mainboard 25 are integrated in the upper housing 211 and the lower housing 212, so that the user can simply disassemble the key assembly 2 as a whole to complete the replacement.

[0059] like Figure 2 As shown, a first through hole 2111 is formed on the upper shell 211 , and at least a portion of the buttons 24 can pass through the first through hole 2111 to extend out of the second shell 21 .

[0060] like Figure 1 As shown, it also includes a handle mainboard 5, which is installed in the first shell 1 and can be electrically connected to the button mainboard 25.

[0061] like Figure 2As shown, a second through hole 2121 is formed on the lower shell 212; Figure 4 As shown, a third through hole 11 is formed on the first shell 1; the second through hole 2121 corresponds to the third through hole 11, and at least part of the handle main board 5 can pass through the second through hole 2121 and the third through hole 11 to connect with the key main board 25. In this embodiment, a first connector is integrated on the handle main board 5, and a second connector is formed on the key main board 25. The first connector and the second connector match to electrically connect the key assembly 2 to the handle. To facilitate the replacement of the key assembly 2, a second through hole 2121 is formed on the lower shell 212 in this embodiment to expose the second connector, and a third through hole 11 is formed on the first shell 1 to expose the first connector. The second through hole 2121 corresponds to the position of the third through hole 11, thereby facilitating the overall replacement of the key assembly 2 and the control connection with the handle.

[0062] like Figure 2-Figure 4 As shown, the second snap-fit ​​component 23 is a snap-fit, and the first snap-fit ​​component 4 is a slot. The snap-fit ​​can be snapped or released with the slot, so that the button component 2 can be snapped or released with the first shell 1. The structural design of the snap-fit ​​and the slot in this embodiment makes the assembly process simple and quick. The user only needs to match the snap-fit ​​with the slot and complete the assembly with a light press, without the need to use additional tools or complicated operating steps, which greatly improves the assembly efficiency and saves assembly time. At the same time, the structural design of the snap-fit ​​and the slot in this embodiment has a locking mechanism (specifically, Figure 8 Once assembled, the buckle can be firmly locked in the slot and is not easy to fall off or loosen, ensuring the stability and reliability of the connection and effectively preventing equipment failure or safety hazards caused by poor connection.

[0063] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A controller module quick release mechanism, characterized in that: include: A first housing (1) and a key assembly (2), wherein the key assembly (2) is detachably mounted on the first housing (1); A first sliding clamping assembly (3) and a first clamping assembly (4), wherein the first sliding clamping assembly (3) and the first clamping assembly (4) are respectively arranged on the first housing (1); The key assembly (2) comprises a second housing (21), a second sliding clamping assembly (22) and a second clamping assembly (23), wherein the second sliding clamping assembly (22) and the second clamping assembly (23) are respectively arranged on the second housing (21); The first sliding clamping assembly (3) is matched with the second sliding clamping assembly (22), and the first clamping assembly (4) is matched with the second clamping assembly (23), so that the key assembly (2) can be clamped or released with the first housing (1).

2. A controller module quick release mechanism according to claim 1, characterized in that: The first sliding clamping assembly (3) comprises a sliding block (31), and the sliding block (31) is slidably arranged on the first housing (1); The second sliding locking assembly (22) comprises a sliding groove (221), and the sliding groove (221) is arranged on the second shell (21); the sliding block (31) can slide into the sliding groove (221) to enable the key assembly (2) to be locked with the first shell (1), or the sliding block (31) can slide out of the sliding groove (221) to release the locking of the key assembly (2) and the first shell (1).

3. A controller module quick release mechanism according to claim 2, characterized in that: A first limiting member (222) is formed on the sliding groove (221), and the first limiting member (222) is used to lock the sliding block (31) to prevent the sliding block (31) from falling off the sliding groove (221).

4. A controller module quick release mechanism according to claim 2, characterized in that: The first sliding clamping assembly (3) further comprises a toggle member (32), an elastic member (33) and a second limiting member (34); the second limiting member (34) is fixed on the first shell (1), and the sliding block (31) is located between the second limiting member (34) and the first shell (1); one end of the elastic member (33) is fixed on the first shell (1), and the other end is connected to the sliding block (31); the toggle member (32) is fixedly connected to the sliding block (31).

5. A controller module quick release mechanism according to any one of claims 2 to 4, characterized in that: The second shell (21) comprises an upper shell (211) and a lower shell (212), wherein the upper shell (211) and the lower shell (212) are spliced ​​together; the slide groove (221) is arranged on the upper shell (211); and the second clamping assembly (23) is arranged on the lower shell (212).

6. A controller module quick release mechanism according to claim 5, characterized in that: The key assembly (2) further comprises a key (24) and a key main board (25); the key (24) is connected to the key main board (25), and the key (24) and the key main board (25) are both installed in the second housing (21).

7. A controller module quick release mechanism according to claim 6, characterized in that: A first through hole (2111) is formed on the upper shell (211), and at least part of the buttons (24) can pass through the first through hole (2111) to extend out of the second shell (21).

8. The controller module quick release mechanism according to claim 6, characterized in that: It also comprises a handle main board (5), wherein the handle main board (5) is installed in the first shell (1), and the handle main board (5) can be electrically connected to the button main board (25).

9. A controller module quick release mechanism according to claim 8, characterized in that: A second through hole (2121) is formed on the lower shell (212); a third through hole (11) is formed on the first shell (1); the second through hole (2121) corresponds to the third through hole (11), and at least a portion of the handle main board (5) can pass through the second through hole (2121) and the third through hole (11) to be connected to the button main board (25).

10. The controller module quick release mechanism according to claim 1, characterized in that: The second snap-fit ​​assembly (23) is a snap-fit, and the first snap-fit ​​assembly (4) is a slot; the snap-fit ​​can be snapped into or released from the slot, so that the key assembly (2) can be snapped into or released from the first housing (1).

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