Adapter for track socket

Abstract

The application relates to the technical field of sockets, in particular to an adapter of a track type socket. The adapter further comprises two auxiliary gears (2) arranged on a base (1), two conductive pins (3) and a main gear (5) arranged on a rotating ring (4). Before the adapter is installed on a track plate (9), the conductive tabs (32) of the two conductive pins (3) are respectively located in two open grooves (111) of the base (1) by rotating the rotating ring (4); after a plug plate (11) of the base (1) is inserted into a sliding groove of the track plate (9), the conductive tabs (32) of the two conductive pins (3) are respectively extended outwards from the two open grooves (111) by rotating the rotating ring (4), and the two conductive tabs (32) are inserted into conductive bushings (911) on left and right side walls in the track plate (9). The adapter has the advantages of convenient installation and use.

Description

Technical Field

[0001] This invention relates to the field of socket technology, and in particular to an adapter for a track socket. Background Technology

[0002] A track-mounted socket includes a track plate and several adapters slidably mounted thereon. The track plate has conductive sleeves electrically connected to the power supply line. The adapters have conductive prongs and sockets. When using the track-mounted socket, the conductive prongs of the adapters are inserted into the conductive sleeves of the track plate and make electrical contact with the sleeves. Thus, when an appliance is plugged into the socket of the adapter, the appliance draws power from the adapter.

[0003] Among them, the connection and disassembly of the adapter and the rail plate, as well as the structure of the electrical connection, are the key technical aspects of various rail-mounted socket products. Summary of the Invention

[0004] In view of this, the present invention proposes an adapter for a rail-mounted socket to facilitate the installation of the adapter in the rail-mounted socket.

[0005] In the adapter for a rail-mounted socket provided in this embodiment, the adapter includes a base and two auxiliary gears, two conductive pins, a rotating ring and a main gear disposed on the base.

[0006] The base has an annular sidewall formed on its top outer perimeter, with a plate extending from its bottom. The plate has two slots spaced apart along its length from the bottom surface of the base, located on opposite sides. Two auxiliary gears are rotatably connected to the base and each corresponds to one of the slots. Each conductive pin includes a conductive rod and a conductive tab extending from the sidewall of the rod; one conductive rod is coaxially connected to one auxiliary gear, and the conductive tab is located in the slot. The lower part of the rotating ring extends into the annular sidewall and is rotatably mounted on the base. The main gear is coaxially connected to the rotating ring and meshes with both auxiliary gears, so that the rotation of the rotating ring causes the conductive tabs of the two conductive pins to rotate around the conductive rod until they extend out of their respective slots.

[0007] To facilitate technical personnel's understanding of the adapter's structure, a track plate is used as an example. For instance, the track plate contains an installation space. A conductive sleeve is located on both the left and right walls of this space, and the top wall of the installation space has a limiting opening for the adapter's limiting plate to extend into and slide. As can be seen from the above design, before the adapter is installed on the track plate, rotating the rotating ring allows the conductive prongs of the two conductive pins to be positioned in the two opening slots of the base. After the base's insert plate extends into the track plate's groove, rotating the rotating ring allows the conductive prongs of the two conductive pins to extend outward from the two opening slots, and these prongs engage with the conductive sleeves on the left and right walls of the track plate. Thus, when the adapter is installed on the track plate, an electrical connection with the track plate is simultaneously established. This adapter offers the advantages of easy installation and use.

[0008] In a preferred embodiment of the adapter provided in the above embodiments, the diameter of the main gear can be larger than the diameter of the secondary gear, so that the rotating ring can meet the requirements of the rotation angle range of the conductive insert by rotating a small angle.

[0009] In a preferred embodiment of the adapter provided in the above embodiments, the rotating ring is further provided with at least one connecting arm. One end of the connecting arm is connected to the inner wall of the rotating ring, and the other end extends to connect with the top or bottom surface of the main gear. This coaxially connects the main gear to the rotating ring. It should be noted that, in specific implementations, two connecting arms located on the same straight line can be provided on the rotating ring as needed, or three connecting arms with the same included angle can be provided on the rotating ring. Furthermore, a fixing frame can be formed on the rotating ring, and the main gear can be detachably and coaxially mounted on the fixing frame. For example, the fixing frame has a through hole, and the shaft on one side of the main gear is connected to the through hole via a flat key.

[0010] In a preferred embodiment of the adapter provided in the above embodiments, when the other end of a connecting arm extends to connect with the bottom surface of the main gear, two limiting ribs can also be provided on the top surface of the base. The two limiting ribs are set at a fixed angle with the axis of the main gear as the center. The two limiting ribs cooperate with one of the connecting arms to limit the rotation range of the rotating ring to match the required rotation range of the conductive insert. This also avoids damage to the conductive pin and other components in the adapter caused by excessive rotation angle due to accidental operation of the rotating ring.

[0011] It should be noted that, in addition to the above-described implementation method of limiting the rotation range of the rotating ring to match the required rotation range of the conductive insert, the implementation method is not limited to this.

[0012] For example, in one alternative embodiment, the base has at least one stop bar extending away from its top surface, and a locking block is provided on the side of the stop bar facing the annular sidewall; the lower part of the rotating ring has an arc-shaped groove into which the locking block extends, and the locking block cooperates with the arc-shaped groove to limit the rotation range of the rotating ring to match the required rotation range of the conductive insert.

[0013] In a preferred embodiment of the adapter provided in the above embodiments, the main gear is provided with an annular groove coaxial with it, and the adapter further includes a torsion spring, which is coaxially disposed in the annular groove, with one end connected to the main gear and the other end fixedly disposed relative to the base.

[0014] For example, the annular groove can face the base or face away from the base. For instance, the annular groove can face the base, with one end of the torsion spring connected to the main gear and the other end directly connected to the base.

[0015] In another alternative embodiment, in one embodiment where the annular groove faces away from the base, the adapter further includes: a mounting bracket including a mounting plate and a plurality of legs disposed on one side of the mounting plate; the mounting plate is disposed above the main gear and connected to one end of the torsion spring, and the plurality of legs are connected to the base.

[0016] In a preferred embodiment of the adapter provided in the above embodiments, the lower ends of the plurality of legs are provided with sockets, and the top surface of the base is provided with a plurality of limiting strips and inserts extending from the inner side of the limiting strips. The limiting strips limit the external movement of the legs, and the inserts are inserted into the sockets to restrict the movement of the mounting bracket in a direction parallel to the base. The adapter further includes a top cover that presses the mounting bracket between the top cover and the base, and the top cover is connected to the base. For example, the top cover can be connected to the base by a plurality of screws passing through it, or a plurality of connecting claws can be provided on the bottom surface of the top cover, and the connecting claws engage with the top surface of the base.

[0017] Furthermore, in the embodiment of the two-prong socket, at least two electrical connectors of the adapter can be disposed on the top surface of the mounting bracket and used for electrical connection with an external plug. Each conductive rod is also electrically connected to one electrical connector.

[0018] Preferably, in an embodiment of the three-hole socket, a conductive sleeve is further provided on the bottom wall of the mounting space. Correspondingly, the adapter also includes a grounding plug and an electrical connector connected thereto. The grounding plug can pass through the aforementioned mounting bracket, and the main gear extends from the bottom surface of the base's insert plate. The grounding plug is inserted into and conducts electricity with the conductive sleeve provided on the bottom wall of the mounting space.

[0019] In a preferred embodiment of the adapter provided in the above embodiments, a rotating shaft is formed at the lower end of the secondary gear, and a shaft hole adapted to the rotating shaft is formed on the base, so that the secondary gear is rotatably mounted on the base. The rotating ring is also provided with a pressure ring, which is coaxially connected to the inner side of the rotating ring. The pressure ring is located above the two secondary gears and limits the two secondary gears in the axial direction.

[0020] In a preferred embodiment of the adapter provided in the above embodiments, the secondary gear can be connected to the conductive pin by injection molding, and a protective sleeve is formed at the lower end of the secondary gear, which covers part of the conductive rod and part of the conductive insert of the conductive pin. This provides insulation protection for the non-conductive parts of the conductive pin. Preferably, the conductive rod is flat and has a buckle that engages with the inner wall of the secondary gear. This makes the connection between the conductive pin and the main gear more secure. Attached Figure Description

[0021] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which will make the above and other features and advantages of the present invention more apparent to those skilled in the art. In the drawings:

[0022] Figure 1 This is a schematic diagram of the external structure of the adapter for the rail-mounted socket in this embodiment.

[0023] Figure 2 This is a schematic diagram of the transmission structure of the adapter for the track-mounted socket in this embodiment.

[0024] Figure 3 This is an exploded view of the adapter of the track-mounted socket in this embodiment.

[0025] The accompanying figure is labeled as follows:

[0026] 1-Base; 101-Annular sidewall; 11-Insertion plate; 111-Opening slot; 12-Limiting rib; 13-Stop bar; 131-Catching block; 14-Limiting strip; 141-Insertion block; 15-Shaft hole;

[0027] 2-Secondary gear; 21-Shaft; 22-Protective sleeve;

[0028] 3-Conductive pin; 31-Conductive rod; 32-Conductive insert; 33-Grounding insert; 34-Electrical connector;

[0029] 4-Rotating ring; 41-Connecting arm; 42-Arc-shaped groove; 43-Pressure ring;

[0030] 5-Main gear; 51-Annular groove;

[0031] 6- Torsion spring;

[0032] 7-Mounting bracket; 71-Leg; 711-Socket; 72-Mounting plate;

[0033] 8-Top cover;

[0034] 9- Track plate; 91- Installation space; 911- Conductive sleeve; 92- Limiting port. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the following embodiments are provided to further illustrate the present invention in detail.

[0036] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] from Figure 1 As can be seen, the adapter in this embodiment includes a base 1, a rotating ring 4, and a top cover 8. The base 1 has an annular sidewall 101 formed on its top outer periphery, and a plug plate 11 extends from its bottom. The plug plate 11 has two slots 111 spaced apart along its length extending from the bottom surface of the base 1, with the two slots 111 located on opposite sides of the plug plate 11. The lower part of the rotating ring 4 extends into the annular sidewall 101 and is rotatably mounted on the base 1. The top cover 8 has multiple sockets for connection to a plug. The top cover 8 is connected to the base 1 and can limit the axial movement of the rotating ring 4. For example, multiple screws can pass through the base 1 to connect to the top cover 8, or multiple connecting claws can be provided on the bottom surface of the top cover 8, which engage with the top surface of the base 1.

[0038] Combination Figures 1 to 3 It is known that the adapter also includes two auxiliary gears 2, two conductive pins 3, and a main gear 5, which are mounted on the base 1 and the rotating ring 4.

[0039] Both secondary gears 2 are rotatably connected to the base 1 and each corresponds to an opening slot 111. In an optional embodiment, combined with Figure 3 The lower end of the secondary gear 2 has a rotating shaft 21, and the base 1 has a shaft hole 15 adapted to the rotating shaft 21, so that the secondary gear 2 is rotatably mounted on the base 1. Figure 2It can be seen that the rotating ring 4 can also be provided with a pressure ring 43, which is coaxially connected to the inner side of the rotating ring 4. The pressure ring 43 is located above the two auxiliary gears 2 and limits the two auxiliary gears 2 in the axial direction.

[0040] It should be noted that, in the adapter provided in this embodiment, the way the secondary gear 2 is rotatably mounted on the base 1 is not limited to the method described above. For example, two bearings can also be provided on the base 1, and the two secondary gears 2 can be connected to one bearing respectively.

[0041] Reference Figure 2 and Figure 3 The main gear 5 is coaxially connected to the rotating ring 4. In a preferred embodiment, the rotating ring 4 is further provided with at least one connecting arm 41, one end of which is connected to the inner wall of the rotating ring 4, and the other end extends to connect with the top or bottom surface of the main gear 5, thereby coaxially connecting the main gear 5 to the rotating ring 4.

[0042] It should be noted that, in specific implementations, two connecting arms 41 located on the same straight line can be provided on the rotating ring 4 as needed, or three connecting arms 41 with the same included angle can be provided on the rotating ring 4, or other implementations can be provided with multiple connecting arms 41. In addition, a fixing frame can be formed on the rotating ring 4, and the main gear 5 can be detachably and coaxially mounted on the fixing frame. For example, a through hole can be formed on the fixing frame, and the rotating shaft 21 on one side of the main gear 5 can be connected to the through hole by a flat key.

[0043] Reference Figure 2 and Figure 3 The main gear 5 meshes with both secondary gears 2. Each conductive pin 3 includes a conductive rod 31 and a conductive insert 32 extending from the side wall of the conductive rod 31. One conductive rod 31 is coaxially connected to one secondary gear 2, and the conductive insert 32 is located in the opening slot 111. The conductive inserts 32 of the two conductive pins 3 are rotated around the conductive rod 31 by the rotation of the rotating ring 4 so that they extend out of their respective opening slots 111.

[0044] In a preferred embodiment, the secondary gear 2 can be connected to the conductive pin 3 by injection molding, and a protective sleeve 22 can be formed at the lower end of the secondary gear 2, covering part of the conductive rod 31 and part of the conductive insert 32 of the conductive pin 3. This provides insulation protection for the non-conductive parts of the conductive pin 3. Preferably, the conductive rod 31 can be flat, and a buckle can be provided on the conductive rod 31, which engages with the inner wall of the secondary gear 2. This makes the connection between the conductive pin 3 and the main gear 5 more secure.

[0045] To make it easier for technicians to understand the structure of the adapter, the following explanation is based on the track plate 9. For example, the track plate 9 has an installation space 91 inside. The left and right walls of the installation space 91 are provided with conductive sleeves 911, and the top wall of the installation space 91 has a limiting port 92 for the adapter's limiting plate to extend into and slide.

[0046] As can be seen from the above embodiment of the adapter, before the adapter is installed on the track plate 9, rotating the rotating ring 4 allows the conductive inserts 32 of the two conductive pins 3 to be located in the two opening slots 111 of the base 1, respectively. After the insert plate 11 of the base 1 extends into the limiting port 92 of the track plate 9, rotating the rotating ring 4 allows the conductive inserts 32 of the two conductive pins 3 to extend outward from the two opening slots 111, and the two conductive inserts 32 are inserted into the conductive sleeves 911 on the left and right walls of the track plate 9. Thus, when the adapter is installed on the track plate 9, the electrical connection with the track plate 9 is completed simultaneously. This adapter has the advantages of being easy to install and use.

[0047] In a preferred embodiment, the diameter of the main gear 5 can be larger than the diameter of the secondary gear 2, so that the rotating ring 4 can meet the rotation angle requirements of the conductive insert 32 by rotating a small angle. This facilitates easier installation of the adapter onto the track plate 9.

[0048] Reference Figure 2 and Figure 3 In a preferred embodiment, when the other end of a connecting arm 41 extends to connect with the bottom surface of the main gear 5, two limiting ribs 12 can be provided on the top surface of the base 1. The two limiting ribs 12 are set at an angle with respect to the axis of the main gear 5. The two limiting ribs 12 cooperate with a connecting arm 41 to limit the rotation range of the rotating ring 4 to match the required rotation range of the conductive insert 32. This also prevents damage to the conductive pin 3 and other components in the adapter caused by excessive rotation due to accidental operation of the rotating ring 4.

[0049] It should be noted that, in addition to the above-described method of using the limiting rib 12 and connecting arm 41 to cooperate, the implementation of limiting the rotation range of the rotating ring 4 to match the required rotation range of the conductive insert 32 is not limited to this. For example, in an optional embodiment, at least one stop bar 13 extends from the top surface of the base 1, and a locking block 131 is provided on the side of the stop bar 13 facing the annular sidewall 101. Correspondingly, an arc-shaped groove 42 is formed in the lower part of the rotating ring 4 for the locking block 131 to extend into, and the locking block 131 cooperates with the arc-shaped groove 42 to limit the rotation range of the rotating ring 4 to match the required rotation range of the conductive insert 32.

[0050] Reference Figure 2 and Figure 3 In a preferred embodiment, the main gear 5 is provided with an annular groove 51 coaxial with it. The adapter also includes a torsion spring 6, which is coaxially disposed in the annular groove 51, with one end connected to the main gear 5 and the other end fixed relative to the base 1. Thus, when the rotating ring 4 is rotated to an extreme angle, the rotating ring 4 can automatically return to its original position using the elastic restoring force of the torsion spring 6. Preferably, the torsion spring 6 can be configured to retract the conductive insert 32 into the opening groove 111 after resetting the rotating ring 4. Thus, without any manual application, the conductive insert 32 can retract into the opening groove 111, making it convenient for people to insert the adapter's insert plate 11 into the track plate 9 through the limiting opening 92. Then, applying torque to the rotating ring 4 will connect the adapter's conductive insert 32 to the conductive sleeve 911 of the track plate 9, completing the final installation.

[0051] Exemplarily, the annular groove 51 can face or turn away from the base 1. For example, the annular groove 51 can face the base 1, with one end of the torsion spring 6 connected to the main gear 5 and the other end directly connected to the base 1. (See reference...) Figure 2 and Figure 3 In another alternative embodiment, where the annular groove 51 faces away from the base 1, the adapter further includes a mounting bracket 7, which includes a mounting plate 72 and a plurality of legs 71 disposed on one side of the mounting plate 72. The mounting plate 72 is disposed above the main gear 5 and connected to one end of the torsion spring 6, and the plurality of legs 71 are connected to the base 1 to fix one end of the torsion spring 6 relative to the base 1.

[0052] Reference Figure 3 In a preferred embodiment of the adapter provided in the above embodiments, the lower ends of the plurality of support legs 71 are provided with insertion ports 711, and the top surface of the base 1 is provided with a plurality of limiting strips 14 and insertion blocks 141 extending from the inner side of the limiting strips 14. The limiting strips 14 limit the outer side of the support legs 71, and the insertion blocks 141 are inserted into the insertion ports 711 to restrict the movement of the mounting bracket 7 in a direction parallel to the base 1. The top cover 8 can press the mounting bracket 7 between the top cover 8 and the base 1 to restrict the axial movement of the mounting bracket 7.

[0053] Furthermore, refer to Figure 3 In the embodiment of the two-prong socket, at least two electrical connectors 34 of the adapter can be disposed on the top surface of the mounting bracket 7 and used for electrical connection with an external plug. Each conductive rod 31 is also electrically connected to one electrical connector 34.

[0054] Preferably, in an embodiment of the three-hole socket, a conductive sleeve 911 is further provided on the bottom wall of the mounting space 91. Accordingly, referring to Figure 3The adapter also includes a grounding plug 33 and an electrical connector 34 connected thereto. The grounding plug 33 can pass through the mounting bracket 7 and the main gear 5 and extend from the bottom surface of the plug plate 11 of the base 1. The grounding plug 33 is plugged into and electrically connected to the conductive plug sleeve 911 provided on the bottom wall of the mounting space 91.

[0055] Specifically, the present invention can achieve the following objectives:

[0056] Firstly, by rotating the main gear 5 and two auxiliary gears 2 through the rotating ring 4, the two conductive pins 3 are driven to rotate, which makes it easier to connect the adapter to the track plate 9.

[0057] Secondly, by changing the transmission ratio between the main gear 5 and the secondary gear 2, the rotation range of the conductive pin 3 can be controlled by slightly adjusting the rotating ring 4.

[0058] Thirdly, by setting up torsion spring 6 and utilizing its reset function, the installation of the adapter becomes more convenient.

[0059] This invention relates to the field of socket technology, and in particular to an adapter for a track-type socket. The adapter further includes two auxiliary gears 2, two conductive pins 3, and a main gear 5 mounted on a rotating ring 4, all mounted on a base 1. Before the adapter is installed onto the track plate 9, rotating the rotating ring 4 allows the conductive prongs 32 of the two conductive pins 3 to be positioned in the two opening slots 111 of the base 1. After the base 1's insert plate 11 extends into the sliding groove of the track plate 9, rotating the rotating ring 4 allows the conductive prongs 32 of the two conductive pins 3 to extend outward from the two opening slots 111, and the two conductive prongs 32 are inserted into the conductive sleeves 911 on the left and right sides of the track plate 9. This adapter has the advantages of easy installation and use.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. The nouns and pronouns referring to persons in this patent application are not limited to specific genders.

Claims

1. An adapter for a track-mounted socket, characterized in that, include: A base (1) has an annular sidewall (101) formed on the outer periphery of its top surface, and a plate (11) extends out from its bottom. The plate (11) has two slots (111) spaced apart along the length of the bottom surface of the base (1), and the two slots (111) are located on opposite sides of the plate (11); two auxiliary gears (2) are rotatably connected to the base (1) and each corresponds to one of the slots (111); two conductive pins (3) include a conductive rod (31) and a conductive insert (32) extending from the sidewall of the conductive rod (31); one conductive rod (31) is coaxially connected to one of the auxiliary gears (2), and the conductive insert (32) is located in the slot (111); A rotating ring (4) with its lower part extending into the annular sidewall (101) and rotatably mounted on the base (1); a main gear (5) coaxially connected to the rotating ring (4) and meshing with both secondary gears (2) so that the rotating ring (4) rotates the conductive inserts (32) of the two conductive pins (3) around the conductive rod (31) to extend out of their respective corresponding opening slots (111); the main gear (5) is provided with an annular groove (51) coaxial with it, the annular groove (51) facing away from the base (1); A torsion spring (6) is coaxially disposed in the annular groove (51), with one end connected to the main gear (5) and the other end fixedly disposed relative to the base (1); A mounting bracket (7) includes a mounting plate (72) and a plurality of support legs (71) disposed on one side of the mounting plate (72); the mounting plate (72) is disposed above the main gear (5) and connected to one end of the torsion spring (6); the plurality of support legs (71) are connected to the base (1); the lower end of the plurality of support legs (71) is provided with a socket (711); the top surface of the base (1) is provided with a plurality of limiting strips (14) and a plug (141) extending from the inner side of the limiting strips (14); the limiting strips (14) limit the outside of the support legs (71), and the plug (141) is inserted into the socket (711); A top cover (8) presses the mounting bracket (7) between the top cover (8) and the base (1), and the top cover (8) is connected to the base (1).

2. The adapter according to claim 1, characterized in that: The diameter of the main gear (5) is larger than the diameter of the secondary gear (2).

3. The adapter according to claim 1, characterized in that: The rotating ring (4) also includes at least one connecting arm (41), one end of which is connected to the inner wall of the rotating ring (4), and the other end of which extends to connect with the bottom surface of the main gear (5); two limiting ribs (12) are also provided on the top surface of the base (1), and the two limiting ribs (12) are set at an angle with the axis of the main gear (5) as the center; wherein, the two limiting ribs (12) are matched with one of the connecting arms (41) to limit the rotation range of the rotating ring (4) to match the required rotation range of the conductive insert (32).

4. The adapter according to claim 1, characterized in that, At least one stop bar (13) extends from the top surface of the base (1), and a locking block (131) is provided on the side of the stop bar (13) facing the annular sidewall (101); the lower part of the rotating ring (4) forms an arc-shaped groove (42) into which the locking block (131) extends, and the locking block (131) cooperates with the arc-shaped groove (42) to limit the rotation range of the rotating ring (4) to match the required rotation range of the conductive insert (32).

5. The adapter according to claim 1, characterized in that, The lower end of the auxiliary gear (2) is formed with a rotating shaft (21), and the base (1) is formed with a shaft hole (15) adapted to the rotating shaft (21) so that the auxiliary gear (2) is rotatably mounted on the base (1); the rotating ring (4) is also provided with a pressure ring (43), which is coaxially connected to the inner side of the rotating ring (4), and the pressure ring (43) is located above the two auxiliary gears (2) and limits the two auxiliary gears (2) in the axial direction.

6. The adapter according to claim 1, characterized in that, The secondary gear (2) is connected to the conductive pin (3) by injection molding, and a protective sleeve (22) is formed at the lower end of the secondary gear (2). The protective sleeve (22) covers part of the conductive rod (31) and part of the conductive insert (32) of the conductive pin (3).

7. The adapter according to claim 6, characterized in that, The conductive rod (31) is flat and has a buckle on it, which engages with the inner wall of the auxiliary gear (2).

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