Leakage protection linkage mechanism and leakage protection circuit breaker

Abstract

The present invention provides a leakage protection linkage mechanism and a leakage protection circuit breaker, which are used for abutting with an operating mechanism, wherein the operating mechanism includes a moving contact and a rotating plate for driving the moving contact to move, the linkage member is engaged with the rotating plate, and the collar member includes a first pin for abutting with a test button, a second pin driven by the linkage member and capable of conducting with a magnetic yoke, and an intermediate portion fixed on the linkage member, wherein the first pin and the second pin are both elastically fixedly connected with the intermediate portion. When the moving contact abuts with the static contact, the test system driven by the test button can normally detect the leakage protection circuit breaker, and the leakage protection function works normally; when the moving contact does not abut with the static contact, the second pin is not conducted with the magnetic yoke, and the test button cannot realize the conductive function by pressing the first pin, thereby protecting the circuit board and the leakage release from damage when the mechanism is disconnected, and it is independent of the power supply and load wiring positions in the circuit.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and in particular to a leakage protection linkage mechanism and a leakage protection circuit breaker. Background Art

[0002] A leakage circuit breaker is a switch that automatically operates when the residual current in a circuit exceeds a preset value. It is a current switching device that directly or indirectly protects people or electrical equipment from electric shock hazards, or protects against fires caused by grounding faults and line insulation damage. It can carry, close and disconnect the current in the normal circuit in a timely manner according to the circuit's abnormality, overload, circuit breaker and circuit leakage conditions, thereby ensuring the safety of people and equipment.

[0003] The test circuit of the existing leakage protection circuit breaker generally needs to draw power directly from the circuit board, and the circuit board draws power from the outgoing terminal in the line. During installation and use, it must be wired strictly according to the incoming and outgoing terminal markings. If the incoming and outgoing lines are connected reversely, there is a risk of burning the leakage release coil and the circuit board, causing the product to lose its leakage protection function. If reverse wiring is required, the model must be replaced, which brings inconvenience to use. Summary of the invention

[0004] The object of the present invention is to provide a leakage protection linkage mechanism and a leakage protection circuit breaker to solve the technical problem in the prior art that the leakage protection circuit breaker may have a burning risk when reversely wired.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a leakage protection linkage mechanism for abutting and cooperating with an operating mechanism, the operating mechanism includes a moving contact and a rotating plate for driving the moving contact to move, and it includes a linkage part and a ring part, the linkage part is engaged with the rotating plate, the ring part includes a first pin for abutting with a test button, a second pin driven by the linkage part and conductive with a yoke, and an intermediate part fixed on the linkage part, the first pin and the second pin are elastically fixedly connected to the intermediate part.

[0006] Furthermore, a first rotating shaft runs through the linkage member, and the linkage member and the sleeve member are both sleeved on the first rotating shaft.

[0007] Furthermore, the linkage member includes a rotating body rotatably connected to the first rotating shaft and a first buckling portion that can be buckled with the rotating plate, and the rotating body and the first buckling portion are fixedly connected.

[0008] Furthermore, a fixing ring for accommodating the middle portion is extended from one side of the rotating body, and a notch groove for the first pin to extend is formed on the fixing ring.

[0009] Furthermore, a linkage bracket for limiting the rotation of the second pin is provided on one side of the fixing ring, and the second pin is located on the linkage bracket.

[0010] Furthermore, the first rotating shaft is connected to the leakage release via a lead wire.

[0011] Furthermore, the collar member is a torsion spring, and the middle portion of the torsion spring is sleeved on the first rotating shaft.

[0012] The present invention also discloses a leakage protection circuit breaker, comprising an operating mechanism, a leakage release, a test button, a zero-sequence current transformer and the leakage protection linkage mechanism as described above, wherein the outer ring of the leakage release is provided with a coil and a yoke arranged at opposite ends of the coil.

[0013] Furthermore, it also includes a conductive tube arranged on the pressing path of the test button, the first pin can be connected to the conductive tube, and the conductive tube is connected to the circuit board after passing through the zero-sequence current transformer.

[0014] Furthermore, the operating mechanism includes a moving contact and a rotating plate driving the moving contact to move, one side of the coil is connected to a stationary contact, and the moving contact can be conductively connected to the stationary contact.

[0015] The leakage protection linkage mechanism and the leakage protection circuit breaker provided by the present invention have the following beneficial effects: compared with the prior art, the leakage protection linkage mechanism and the leakage protection circuit breaker of the present invention can drive the movement of the moving contact and realize the engagement with the linkage part through the rotation of the rotating plate, and when the moving contact is driven to abut against the static contact, the linkage part and the rotating plate are engaged and drive the rotation of the ring part, so that the second pin is conductive to the yoke, and the first pin is always abutted against the test button. At this time, the test system driven by the test button can normally detect the leakage protection circuit breaker; when the rotating plate drives the moving contact not to abut against the static contact, the second pin is not conductive to the yoke, and the test button cannot realize the conductive function by pressing the first pin, that is, only when the operating mechanism is closed, the leakage protection function and the test function can work normally, so that the leakage protection circuit breaker has the function of upper or lower line entry, and its structure is relatively simple and can achieve a better effect of preventing leakage, and it is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a leakage protection circuit breaker provided by an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of the local enlarged structure of part A in FIG.

[0019] Figure 3 A schematic diagram of the structure of the leakage protection linkage mechanism provided by the embodiment of the present invention Figure 1 ;

[0020] Figure 4 A schematic diagram of the structure of the leakage protection linkage mechanism provided by the embodiment of the present invention Figure 2 ;

[0021] Figure 5 A schematic diagram of the three-dimensional structure of the linkage member and the collar member used in the embodiment of the present invention;

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the leakage protection linkage mechanism adopted in the embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Leakage protection linkage mechanism; 2. Operating mechanism; 3. Lead wire; 4. Leakage release; 5. Test button; 6. Zero-sequence current transformer; 7. Conductive tube; 8. Shell; 9. Line; 11. Linkage member; 12. Ring member; 13. First rotating shaft; 111. Rotating body; 112. First buckling part; 113. Fixed collar; 114. Linkage bracket; 1131. Notch groove; 121. First pin; 122. Second pin; 123. Middle part; 21. Moving contact; 22. Rotating plate; 23. Static contact; 24. Second rotating shaft; 221. Second buckling part; 41. Coil; 42. Yoke. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] See also Figure 1 The present invention also provides a leakage protection circuit breaker, which includes an operating mechanism 2, a leakage release 4, a test button 5, a zero-sequence current transformer 6 and a leakage protection linkage mechanism 1. The outer ring of the leakage release 4 is provided with a coil 41 and a yoke 42 arranged at opposite ends of the coil 41.

[0030] Among them, the operating mechanism 2 is used to realize the opening and closing control between the moving contact 21 and the static contact 23. The leakage release 4 is a device for releasing the holding mechanism and automatically disconnecting the circuit breaker. The outer ring is wound with a coil 41, and a yoke 42 is formed at both ends. The yoke 42 can be abutted and conducted with the second pin 122. The coil 41 is wound on the outside of the leakage release 4, and one end of the coil 41 can be conducted with the static contact 23, and the other end of the coil 41 can be conducted with the incoming line. The test button 5 is set in the test test system, which is used to test the leakage protection performance of the system before use, and the test test button system is associated with the moving contact 21. Only when the operating mechanism 2 is closed, the circuit board 9 can draw power from the line, and the leakage protection function and the test function work normally, so that the leakage protection circuit breaker has the function of upper or lower incoming line. The zero-sequence current transformer 6 is arranged on one side of the circuit board 9, and the lead wire can be connected to the circuit board 9 through the zero-sequence current transformer 6, wherein the lead wire directly passes through the zero-sequence current transformer 6 to reduce the number of parts and welding procedures, and one end of the lead wire is connected to the circuit board 9, and the other end is connected to the conductive column. Among them, the leakage release 4 and the zero-sequence current transformer 6 can adopt the conventional leakage release 4 and zero-sequence current transformer 6 in the prior art, which is not the only limitation here. In other embodiments of the present invention, the leakage protection circuit breaker may also include an arc extinguishing chamber (not marked in the figure), a lever assembly (not marked in the figure) and other components, which are all prior art and are not described one by one here.

[0031] Further, see Figure 1 As a specific embodiment of the leakage protection circuit breaker provided by the present invention, it also includes a conductive tube 7 arranged on the pressing path of the test button 5, the first pin 121 can be connected to the conductive tube 7, and the conductive tube 7 is connected to the zero-sequence current transformer 6. Specifically, the conductive tube 7 is directly fixed on the leakage protection circuit breaker housing 8. The conductive tube 7 generally directly adopts a copper tube or other conductive tube body, and the conductive tube 7 is located below the test button 5. When the test button 5 is pressed down, the first pin 121 can be connected to the conductive tube 7. The conductive tube 7 passes through the zero-sequence current transformer 6 and is connected to the circuit board 9 through the lead wire, which can realize the circuit connection between the first pin 121 and the circuit board 9, and then realize the connection of a line of the test system. When the second pin 122 is also connected to the yoke 42, the entire test system can be closed, so that the test system can simulate the leakage fault signal.

[0032] Please also refer to Figures 2 to 4The present invention specifically discloses a leakage protection linkage mechanism 1, which is used to abut and cooperate with an operating mechanism 2. The operating mechanism 2 includes a moving contact 21 and a rotating plate 22 that drives the moving contact 21 to move. It includes a linkage member 11 and a collar member 12. The linkage member 11 is engaged with the rotating plate 22. The collar member 12 includes a first pin 121 for abutting against a test button 5, a second pin 122 driven by the linkage member 11 and conductive with a yoke 42, and an intermediate portion 123 fixed on the linkage member 11. The first pin 121 and the second pin 122 are both elastically fixedly connected to the intermediate portion 123.

[0033] The leakage protection linkage mechanism 1 provided by the present invention can drive the movement of the moving contact 21 and realize the engagement with the linkage member 11 through the rotation of the rotating plate 22. When the moving contact 21 is driven to abut against the static contact 23, the linkage member 11 and the rotating plate 22 are engaged and drive the rotation of the ring member 12, so that the second pin 122 is conductive with the yoke 42, and the first pin 121 is always abutted with the test button 5. At this time, the test implementation system driven by the test button 5 can normally detect the leakage protection circuit breaker; when the rotating plate 22 drives the moving contact 21 not to abut against the static contact 23, the second pin 122 is not conductive with the yoke 42, and the test button 5 cannot realize the conductive function by pressing the first pin 121, that is, only when the operating mechanism 2 is closed, the leakage protection function and the test function can work normally, so that the leakage protection circuit breaker has the function of upper or lower line entry, and is more practical.

[0034] The operating mechanism 2 includes a moving contact 21 and a rotating plate 22 for driving the moving contact 21 to move. A stationary contact 23 is connected to one side of the coil 41. The moving contact 21 can be connected to the stationary contact 23. The operating mechanism 2 of the leakage protection circuit breaker can realize the connection or disconnection of the moving contact 21 and the stationary contact 23. A second rotating shaft 24 is provided in the middle of the rotating plate 22. The rotating plate 22 can be manually or automatically rotated around the second rotating shaft 24, thereby driving the moving contact 21 to move and abut against or separate from the stationary contact 23. A second snap-fitting portion 221 is formed on the side of the rotating plate 22 away from the moving contact 21. The first snap-fitting portion 112 and the second snap-fitting portion 221 can be snapped together and press down the linkage part 11 after the rotating plate 22 rotates, thereby driving the rotation of the ring part 12, so that the second pin 122 is connected to the yoke 42; or, the first snap-fitting portion 112 and the second snap-fitting portion 221 are separated after the rotating plate 22 rotates, and the linkage part 11 is automatically lifted up, so that the second pin 122 is separated from the yoke 42. At this time, no matter the position of the first pin 121, the test system where the test button 5 is located cannot realize the power supply operation from the circuit board 9.

[0035] For further information, please also refer to Figures 2 to 4As a specific embodiment of the leakage protection linkage mechanism 1 provided by the present invention, the linkage member 11 is also penetrated by a first rotating shaft 13, and the linkage member 11 and the collar member 12 are both sleeved on the first rotating shaft 13. Specifically, the first rotating shaft 13 is directly fixed on the housing 8 of the leakage protection circuit breaker, and a protrusion for engaging the first rotating shaft 13 is convexly provided on the housing 8 of the leakage protection circuit breaker, and the first rotating shaft 13 cannot be rotated in the protrusion, the linkage member 11 and the collar member 12 are both directly sleeved on the first rotating shaft 13, and the linkage member 11 and the collar member 12 can both rotate relative to each other around the first rotating shaft 13, and the first rotating shaft 13 can realize the rotation and fixation of the linkage member 11 and the collar member 12. Of course, according to actual conditions and specific needs, in other embodiments of the present invention, the linkage member 11 and the collar member 12 can also rotate around a fixed point in other ways, which is not the only limitation here.

[0036] For further information, see Figures 2 to 4 As a specific embodiment of the leakage protection linkage mechanism 1 provided by the present invention, the linkage member 11 includes a rotating body 111 rotatably connected to the first rotating shaft 13 and a first buckling portion 112 that can be buckled with the rotating plate 22, and the rotating body 111 and the first buckling portion 112 are fixedly connected. Specifically, the rotating body 111 and the first snap-fitting portion 112 are fixedly connected or directly integrally formed, the rotating body 111 is arranged on one side of the first snap-fitting portion 112, and the first snap-fitting portion 112 is a hook plate extending from the rotating body 111 toward the rotating plate 22, the first snap-fitting portion 112 is in the shape of a plate body with a protrusion protruding thereon, and the protrusion can be snapped with the second snap-fitting portion 221 of the rotating plate 22, when the moving contact 21 abuts against the static contact 23, the first snap-fitting portion 112 and the second snap-fitting portion 221 are not snapped; when the moving contact 21 is separated from the static contact 23, the first snap-fitting portion 112 and the second snap-fitting portion 221 are snapped together and pressed down, and the linkage cooperation between the moving contact 21 and the leakage protection linkage mechanism 1 can be realized here. Of course, according to actual conditions and specific needs, in other embodiments of the present invention, the first snap-fitting portion 112 and the second snap-fitting portion 221 can always be snap-fitted, and the first snap-fitting portion 112 can rotate with the second snap-fitting portion 221, so that the ring member 12 rotates accordingly to achieve different matching states, which is not the only limitation here.

[0037] Further, see Figure 5 and Figure 6As a specific embodiment of the leakage protection linkage mechanism 1 provided by the present invention, a fixed collar 113 for accommodating the middle part 123 is extended from one side of the rotating body 111, and a notch groove 1131 for the first pin 121 to extend is provided on the fixed collar 113. Specifically, the fixed collar 113 is an annular cylinder, the fixed collar 113 is arranged on one side of the rotating body 111, and the fixed collar 113 is fixedly connected or integrally formed with the rotating body 111. The fixed collar 113 and the rotating body 111 are both sleeved on the first rotating shaft 13, the collar member 12 is arranged inside the fixed collar 113, and the middle part 123 of the collar member 12 and the fixed collar 113 are coaxially arranged, and a notch groove 1131 is formed on the side wall of the fixed collar 113, and the first pin 121 can pass through the notch groove 1131 to connect with the test button 5, and the side walls on both sides of the notch groove 1131 can also limit the bending angle of the first pin 121. Of course, according to actual conditions and specific needs, in other embodiments of the present invention, only a through hole for the first pin 121 to pass through may be opened on the fixing ring 113, and this is not the only limitation here.

[0038] For further information, see Figure 5 and Figure 6 As a specific embodiment of the leakage protection linkage mechanism 1 provided by the present invention, a linkage bracket 114 for limiting the rotation of the second pin 122 is provided on one side of the fixed collar 113, and the second pin 122 is located on the linkage bracket 114. Specifically, the linkage bracket 114 is located on the side of the fixed collar 113 away from the rotating body 111, and is formed by a notch on one side of the fixed collar 113 and extending from the notch, and the extension direction is radially extending. The second pin 122 is directly placed on the linkage bracket 114, and the linkage bracket 114 limits the downward movement position of the second pin 122. After the position of the second pin 122 is determined, since the middle part 123 has a certain elasticity, the first pin 121 can still cooperate with the test button 5 to realize the up and down movement, and will not drive the up and down movement of the second pin 122, so as to ensure that after the moving contact 21 and the static contact 23 are disconnected, the test detection system cannot continue to draw power from the line, and will not be affected by whether the line is an upper line or a lower line.

[0039] For further information, see Figure 6As a specific embodiment of the leakage protection linkage mechanism 1 provided by the present invention, the first rotating shaft 13 is connected to the leakage release 4 through the lead 3. Specifically, the first rotating shaft 13 is vertically fixed on the inner side of the housing 8, and a socket is provided at the bottom of the first rotating shaft 13, one end of the lead 3 can be inserted into the socket, and the other end of the lead 3 is connected to the leakage release 4, that is, the first rotating shaft 13 is connected to the leakage release 4. When the test button 5 is pressed, the second pin 122 can be connected to the yoke 42, which can connect the test system and ensure the function of the test system. Among them, the socket is provided at the bottom of the first rotating shaft 13 to ensure the tightness of the connection, and the lead 3 will not be affected by the rotation of the first rotating shaft 13. Of course, according to actual conditions and specific needs, in other embodiments of the present invention, the first rotating shaft 13 can also be directly a hollow conductive cylinder, and the lead 3 is directly inserted inside, which is not the only limitation here.

[0040] Further, see Figure 5 and Figure 6 As a specific embodiment of the leakage protection linkage mechanism 1 provided by the present invention, the collar member 12 adopts a torsion spring, and the middle portion 123 of the torsion spring is sleeved on the first rotating shaft 13. Specifically, the collar member 12 has a middle portion 123 and a first pin 121 and a second pin 122 on both sides of the middle portion 123, and its shape is consistent with the shape of the torsion spring. The torsion spring has a spring center and a torsion bar extending at both ends of the spring center. The spring center is equivalent to the middle portion 123, and the two torsion bars are equivalent to the first pin 121 and the second pin 122. The spring center is twisted into several rings. Of course, according to actual conditions and specific needs, in other embodiments of the present invention, the collar member 12 can also adopt other swinging parts similar to torsion springs, which is not the only limitation here.

[0041] When in use, it works as follows:

[0042] When the circuit is in the disconnected state, the moving contact 21 is separated from the static contact 23, one end of the linkage member 11 contacts the rotating plate 22, and the linkage member 11 rotates to a certain position around the first rotating shaft 13. The first pin 121 and the second pin 122 on the collar member 12 installed on the linkage member 11 rotate with the linkage member 11, and one end of the second pin 122 remains separated from the yoke 42. At this time, regardless of whether the circuit is connected from the top or the bottom, the circuit board 9 cannot draw power from the circuit. When the test button 5 is pressed, one end of the first pin 121 contacts the conductive tube 7. Since the second pin 122 remains separated from the yoke 42, the test circuit cannot be connected, and the circuit board 9 and the leakage release 4 do not work, thereby protecting the circuit board 9 and the leakage release 4 from damage.

[0043] When the circuit is in a closed state, the moving contact 21 contacts the static contact 23, one end of the linkage member 11 is separated from the rotating plate 22, and the linkage member 11 rotates to a certain position around the first rotating shaft 13. The first pin 121 and the second pin 122 on the collar member 12 installed on the linkage member 11 rotate with the linkage member 11, and one end of the second pin 122 keeps in contact with the yoke 42. At this time, regardless of whether the circuit is connected from the top or the bottom, the circuit board 9 takes power from the circuit, and the leakage protection function works normally. When the test button 5 is pressed, one end of the first pin 121 contacts the conductive tube 7. Since one end of the second pin 122 keeps closed with the yoke 42, the test circuit is connected, and the leakage fault signal is simulated. The leakage release 4 works, the fault is cut off, and the test button 5 function can also work normally. Obviously, the above embodiment is only an example for clear explanation, and it is not a limitation of the implementation method. For ordinary technicians in the field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A leakage protection linkage mechanism (1), used for abutting and cooperating with an operating mechanism (2), wherein the operating mechanism (2) comprises a moving contact (21) and a rotating plate (22) for driving the moving contact (21) to move, characterized in that: It comprises a linkage member (11) and a collar member (12), wherein the linkage member (11) is engaged with the rotating plate (22), the collar member (12) comprises a first pin (121) for contacting with a test button (5), a second pin (122) driven by the linkage member (11) to be in conduction with a magnetic yoke (42) of a leakage release (4), and an intermediate portion (123) fixed to the linkage member (11), the first pin (121) and the second pin (122) are both elastically fixedly connected to the intermediate portion (123), the linkage member (11) is also penetrated by a first rotating shaft (13), and the linkage member (11) and the collar member (12) are both sleeved on the first rotating shaft (13); The linkage member (11) comprises a rotating body (111) rotatably connected to the first rotating shaft (13) and a first buckling portion (112) capable of buckling with the rotating plate (22), and the rotating body (111) and the first buckling portion (112) are fixedly connected; A fixing ring (113) for accommodating the middle portion (123) extends from one side of the rotating body (111), and a notch groove (1131) for the first pin (121) to extend is formed on the fixing ring (113); A linkage bracket (114) for limiting the rotation of the second pin (122) is provided on one side of the fixing ring (113); the second pin (122) is located on the linkage bracket (114).

2. The leakage protection linkage mechanism (1) according to claim 1, characterized in that: The sleeve ring (12) is a torsion spring, and the middle portion (123) of the torsion spring is sleeved on the first rotating shaft (13).

3. Leakage protection circuit breaker, characterized by: The invention comprises an operating mechanism (2), a leakage release (4), a test button (5), a zero-sequence current transformer (6), and a leakage protection linkage mechanism (1) as claimed in claim 1 or 2, wherein the outer ring of the leakage release (4) is provided with a coil (41) and a yoke (42) provided at opposite ends of the coil (41).

4. The leakage protection circuit breaker according to claim 3, characterized in that: It also includes a conductive tube (7) arranged on the pressing path of the test button (5), the first pin (121) can be connected to the conductive tube (7), and the conductive tube (7) is connected to the circuit board (9) after passing through the zero-sequence current transformer (6).

5. The leakage protection circuit breaker according to claim 4, characterized in that: The operating mechanism (2) comprises a moving contact (21) and a rotating plate (22) for driving the moving contact (21) to move; one side of the coil (41) is connected to a stationary contact (23); and the moving contact (21) can be electrically connected to the stationary contact (23).

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