CN209981151U

CN209981151U - Residual current operated circuit breaker

Info

Publication number: CN209981151U
Application number: CN201920255563.3U
Authority: CN
Inventors: 高楠; 黎佳财; 田巧
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2019-02-28
Filing date: 2019-02-28
Publication date: 2020-01-21
Anticipated expiration: 2029-02-28

Abstract

A residual current operated circuit breaker comprises a housing, a control circuit board, a testing static elastic sheet, a testing dynamic elastic sheet and a piezoresistor, wherein the housing is arranged in a shell; the outer side of the side wall of the housing is provided with a recessed part, the piezoresistor is installed in the recessed part, a first pin of the piezoresistor extends out of the top of the recessed part and is connected with the static testing elastic sheet, the housing can be sleeved on the outer side of the control circuit board to play a good protection role on the control circuit board, the recessed part arranged on the outer side of the side wall of the housing can effectively utilize the limited space to fix the piezoresistor, and the piezoresistor is convenient to be connected with the static testing elastic sheet through the first pin.

Description

Residual current operated circuit breaker

Technical Field

The invention relates to the field of low-voltage electric appliances, in particular to a residual current operated circuit breaker.

Background

The existing residual current operated circuit breaker has the following disadvantages:

(1) the existing circuit breaker control circuit board is generally fixed by a plastic support, the circuit board is exposed in the air, and when the circuit breaker control circuit board is installed in a large short-circuit current, metal particles are reversely sprayed and attached to the surface of the circuit board, so that the circuit board short-circuit risk exists.

(2) The test resistor of the existing circuit breaker generally has no limit fixing characteristic, only depends on the resistor pin to be welded and connected with the related functional module, the change of the placing position of the test resistor is large, the normal operation of other modules of a product is easily influenced, and certain potential safety hazards exist.

(3) The existing circuit breaker is compact in structure, the electric leakage test elastic sheet is often designed on an auxiliary control circuit board on the electric leakage release or fixed on a product base, and the electric leakage test is carried out above the elastic sheet through an electric leakage test button. And receive the high influence of product, the electric leakage test button can only rely on the electric leakage test shell fragment to kick-back and guarantee that the button resets, and the circulation operation back, there is the problem that can't reset in the button.

(4) The existing circuit breaker is influenced by the structural layout of a product, a main circuit board and an auxiliary control circuit board are separately placed, wiring between the main circuit board and the auxiliary control circuit board is more, wiring is more complicated, and the problem of line pressing is easy to occur when a cover is covered.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a residual current operated circuit breaker with simple structure and high reliability.

In order to achieve the purpose, the invention adopts the following technical scheme:

a residual current operated circuit breaker comprises a housing, a circuit board, a testing static elastic sheet, a testing dynamic elastic sheet and a testing resistor, wherein the housing is arranged in a shell; the outer side of the side wall of the housing is provided with a depressed part, a test resistor is installed in the depressed part, and a first pin of the test resistor extends out of the top of the depressed part and is connected with the test static elastic sheet.

Preferably, a limiting structure for limiting the circuit board is arranged in the housing; the limiting structure comprises two first limiting plates and two second inclined limiting plates, wherein the two first limiting plates are respectively arranged on the inner sides of two opposite side walls of the housing and are positioned between the circuit board and the concave part, and the two second inclined limiting plates are respectively arranged on the inner sides of the two opposite side walls of the housing and are positioned on one side of the circuit board away from the concave part; the two first limiting plates and the two second limiting plates are respectively in limiting fit with the circuit board from two sides of the circuit board, and a gap is reserved between the circuit board and the side wall of the housing.

Preferably, the side opening of the recessed portion is opposite to the side wall of one side of the shell, the top opening of the recessed portion extends between the testing static elastic sheet and the testing dynamic elastic sheet, and the first pin of the testing resistor extends out of the top opening of the recessed portion and is connected with the testing static elastic sheet.

Preferably, a side wall groove is formed in the side wall of the housing corresponding to one side, close to the static testing elastic sheet, of the recessed portion, and the second pin of the testing resistor penetrates through the side wall groove from the bottom end opening of the recessed portion to be connected with the testing loop.

Preferably, the top side edge of the side wall groove is provided with a first limiting rib which extends upwards to one side of the first pin and is used for limiting the first pin, and the edge of the side wall groove, which is far away from one side of the concave part, is provided with a second limiting rib which extends to the upper side of the second pin and is used for limiting the second pin.

Preferably, the housing comprises a base and an upper cover above the base; the base is provided with a plug piece on the side wall opposite to the opening of the depressed part, and the side wall of the housing is provided with a slot matched with the plug piece below the depressed part.

Preferably, the plug-pull piece comprises a plug board and a transverse board connected between the plug board and the side wall of the base, the plug board can be inserted into the second cavity and enables the slot to be sleeved on the transverse board, and the plug board is in limit fit with the inner side of the side wall of the second cavity.

Preferably, an upper cover is arranged above the base, an inner side of the side wall of the upper cover is provided with a pressing plate protruding inwards, the bottom of the pressing plate abuts against the top wall of the housing to be in limit fit, and the pressing plate and the plugging piece are respectively in limit fit with the housing; the top wall of the upper cover is provided with a button groove which is sunken inwards and is used for accommodating a test button, and a return spring matched with the test button is arranged in the button groove; the bottom of base is equipped with the bellied sand grip of bottom to the housing, and the sand grip is supported and is avoided housing and base contact in the bottom of housing.

Preferably, the housing comprises a first cavity and a second cavity arranged on one side of the first cavity and communicated with each other, the top of the first cavity protrudes upwards, the height of the first cavity is higher than that of the second cavity, the circuit board is installed in the first cavity, and an electronic element extending into the second cavity is arranged on one side of the circuit board.

Preferably, the testing static elastic sheet and the testing dynamic elastic sheet are arranged on the outer side of the top wall of the second cavity, and the recessed part is arranged on the side wall of the second cavity, which is far away from the first cavity; a top wall groove for accommodating a testing static elastic sheet and a first pin is formed in one side of the top wall of the second cavity, the height of the testing static elastic sheet is smaller than that of the testing dynamic elastic sheet, one end of the testing dynamic elastic sheet is connected with the top wall of the second cavity, the other end of the testing dynamic elastic sheet extends to the upper part of the top wall groove to be matched with the testing static elastic sheet, a top opening of the recessed part is communicated with the bottom of the top wall groove, and the first pin of the testing resistor extends into the top wall groove to be connected with the testing static elastic sheet; an inner wall limiting strip in limiting fit with the test resistor is arranged on the inner wall of the concave part; the top wall of the second cavity is provided with a plurality of first limiting bulges and a plurality of second limiting bulges, a first limiting groove used for limiting and testing the static elastic sheet is formed among the first limiting bulges, and a second limiting groove used for limiting and testing the dynamic elastic sheet is formed among the second limiting bulges.

According to the residual current operated circuit breaker, the housing can be sleeved on the outer side of the circuit board to play a good protection role on the circuit board, the concave part formed on the outer side of the side wall of the housing can effectively utilize the limited space to fix the test resistor, the test resistor is conveniently connected with the test static elastic sheet through the first pin, and the residual current operated circuit breaker has the characteristics of simple and compact structure, convenience in manufacturing and low cost.

In addition, the open-top of depressed part stretches to between test quiet shell fragment and the test movable elastic sheet, and the first pin that not only can be convenient for test resistance is connected with the quiet shell fragment of test, but also can effectively utilize the space between test quiet shell fragment and the test movable elastic sheet to come spacing test resistance, has compact structure and small characteristics. In addition, through the relative setting of the lateral wall of the base one side with the side opening of depressed part and casing, can utilize the lateral wall of base to carry out spacing and protection to the test resistance in the depressed part, avoid in the transportation because reasons such as vibrations make test resistance drop.

In addition, through the top side edge and the side edge in the lateral wall groove extending first spacing muscle and the spacing muscle of second respectively, not only can play the reliable limiting displacement to first pin and second pin, first spacing muscle and the spacing muscle of second can not increase the whole volume of housing moreover, have structural strength height and longe-lived characteristics simultaneously.

Drawings

Fig. 1 is a schematic structural diagram of the circuit breaker of the present invention;

FIG. 2 is a schematic view of the structure of the invention for matching the upper cover with the housing;

FIG. 3 is a schematic structural diagram of the base of the present invention;

FIG. 4 is a schematic view of the structure of the inventive housing;

FIG. 5 is a schematic view of the interior of the inventive enclosure;

fig. 6 is another structural schematic diagram of the inventive housing.

Detailed Description

The following describes the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 6. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-5, the residual current operated circuit breaker includes a housing composed of a base 11 and an upper cover 12, and a housing 2, a circuit board 13, a testing static elastic sheet 31, a testing dynamic elastic sheet 32 and a testing resistor 33 arranged in the housing, wherein the housing 2 is sleeved outside the circuit board 13, the testing static elastic sheet 31 and the testing dynamic elastic sheet 32 which are mutually matched are arranged on the top wall of the housing 2, a testing button 122 matched with the testing dynamic elastic sheet 32 is arranged on the upper cover 12 at a position corresponding to the testing dynamic elastic sheet 32, the testing button 122 can drive the testing dynamic elastic sheet 32 to contact with the testing static elastic sheet 31 to conduct a testing loop, a concave portion 21 is arranged on the outer side of the side wall of the housing 2, the testing resistor 33 is arranged in the concave portion 21, and a first pin 34 of the testing resistor 33 extends out from the top of the concave portion 21 to be.

According to the residual current operated circuit breaker, the housing 2 can be sleeved on the outer side of the circuit board 13 to play a good protection role on the circuit board 13, the concave part 21 formed in the outer side of the side wall of the housing 2 can effectively utilize limited space to fix the test resistor 33, the test resistor 33 is conveniently connected with the test static elastic sheet 31 through the first pin 34, and the residual current operated circuit breaker has the advantages of being simple and compact in structure, convenient to manufacture and low in cost.

As shown in fig. 5, a limiting structure for limiting the circuit board 13 is arranged in the housing 2; the limiting structure comprises two first limiting plates 22 which are respectively arranged on the inner sides of two opposite side walls of the housing 2 and are positioned between the circuit board 13 and the concave part 21, and two inclined second limiting plates 23 which are respectively arranged on the inner sides of two opposite side walls of the housing 2 and are positioned on one side of the circuit board 13 away from the concave part 21; the two first limiting plates 22 and the two second limiting plates 23 respectively limit and match the circuit board 13 from two sides of the circuit board 13 and enable a gap to be reserved between the circuit board 13 and the side wall of the housing 2. The limiting structure not only can reliably limit the circuit board 13 in the housing 2 to prevent the circuit board 13 from contacting and damaging the concave part 21, but also can ensure the air flow in the housing 2 to prevent the heat dissipation of the circuit board 13 from being influenced; the second limiting plate 23 that sets up through two slopes not only can provide a drive circuit board 13 and support the effort on first limiting plate 22, makes circuit board 13 spacing that can more lean on, but also can avoid the side of circuit board 13 and the lateral wall contact of housing 2, can enough reduce the degree of difficulty of assembly, can guarantee circuit board 13's radiating effect again.

As shown in fig. 4-6, the side opening of the recessed portion 21 is disposed opposite to the side wall of the housing on the side of the base 11, the top opening of the recessed portion 21 extends between the testing static spring plate 31 and the testing dynamic spring plate 32, and the first pin 34 of the testing resistor 33 extends from the top opening of the recessed portion 21 and is connected to the testing static spring plate 31. The open-top of depressed part 21 stretches to between test static shell fragment 31 and the test movable elastic fragment 32, not only can be convenient for test resistance 33's first pin 34 be connected with test static shell fragment 31, but also can effectively utilize the space between test static shell fragment 31 and the test movable elastic fragment 32 to come spacing test resistance 33, have compact structure and small characteristics. In addition, the side opening of the recessed portion 21 is arranged opposite to the side wall of the housing on the side of the base 11, so that the side wall of the base 11 can be used for limiting and protecting the test resistor 33 in the recessed portion 21, and the test resistor 33 is prevented from falling off due to vibration and the like in the transportation process.

Furthermore, a side wall groove 27 is formed in the side wall of the housing 2 corresponding to the side of the recessed portion 21 close to the testing static spring plate 31, and a second pin 36 of the testing resistor 33 penetrates through the side wall groove 27 from the bottom opening of the recessed portion 21 to be connected with the testing loop. The side wall groove 27 for the second pin 36 to pass through is formed in the side wall of the housing 2, so that the second pin 36 can be conveniently connected with a test circuit, the structure of the housing 2 can be simplified, and the difficulty and the cost of injection molding of the housing 2 are reduced.

Further, the top edge of the sidewall groove 27 is provided with a first limiting rib 35 extending upwards to one side of the first pin 34 for limiting the first pin 34, and the edge of the sidewall groove 27 far away from the recess 21 is provided with a second limiting rib 37 extending upwards to the sidewall of the base 11 above the second pin 36 for limiting the second pin 36. Extend first spacing muscle 35 and the spacing muscle 37 of second respectively through the top side edge and the side edge at lateral wall groove 27, not only can play the reliable limiting displacement to first pin 34 and second pin 36, first spacing muscle 35 and the spacing muscle 37 of second can not increase the whole volume of housing 2 moreover, have structural strength height and longe-lived characteristics simultaneously.

Further, the housing includes a base 11 and an upper cover 12 above the base 11; the side wall of the base 11 opposite to the opening of the recessed portion 21 is provided with a plug 24, and the side wall of the housing 2 is provided with a slot 240 corresponding to the plug 24 below the recessed portion 21. The housing 2 is matched with the plug piece 24 through the slot 240 to be connected with the side wall of the base 11, and has the characteristics of convenient connection and low assembly difficulty.

Specifically, referring to fig. 4-6, a preferred embodiment of the housing 2 is shown, the housing 2 includes a first cavity 25 and a second cavity 26 disposed at one side of the first cavity 25 and communicated with each other, the top of the first cavity 25 protrudes upward, the height of the first cavity 25 is higher than that of the second cavity 26, the circuit board 13 integrates the existing main circuit board and auxiliary control circuit board, and a mounting space enough to accommodate the circuit board 13 is reserved through the first cavity 25, an electronic component (such as a voltage dependent resistor 14) is disposed at one side of the circuit board 13, the circuit board 13 is mounted in the first cavity 25, and the electronic component at one side of the circuit board 13 extends into the second cavity 26; the test static elastic sheet 31 and the test dynamic elastic sheet 32 are installed on the outer side of the top wall of the second cavity 26, the concave portion 21 is arranged on the side wall of one side, far away from the first cavity 25, of the second cavity 26, the horizontal opening of the concave portion 21 is opposite to the side wall of the shell, the inner wall of the concave portion 21 is provided with the inner wall limiting strip 214 in limiting fit with the test resistor 33, installation of the test resistor 33 is not affected, and the test resistor 33 is prevented from falling out. In addition, the circuit board 13 is accommodated in the first cavity 25 with a higher height, so that the main circuit board and the auxiliary control circuit board can be integrally arranged and installed in the first cavity 25, excessive wiring between the main circuit board and the auxiliary control circuit board and interference with other mechanisms in other shells are avoided, and particularly, when the cover is covered, the cover is prevented from being pressed on a wire.

Further, plug-in components 24 includes picture peg 241 and connects the diaphragm 242 between picture peg 241 and the base 11 lateral wall, and picture peg 241 can insert in the second cavity 26 and make slot 240 cover on diaphragm 242, and the inboard spacing cooperation of picture peg 241 and second cavity 26 lateral wall can realize that the plug-in of cover 2 and base 11 is connected in the limited space of rational utilization cover 2, can very big reduction the degree of difficulty of assembling.

Further, one side of the top wall of the second cavity 26 is provided with a top wall groove 261 for accommodating the testing static elastic sheet 31 and the first pin 34, the testing static elastic sheet 31 is less than the testing dynamic elastic sheet 32 in height, one end of the testing dynamic elastic sheet 32 is connected with the top wall of the second cavity 26, the other end of the testing dynamic elastic sheet 32 extends to the top of the top wall groove 261 to be matched with the testing static elastic sheet 31, the top opening of the depressed part 21 is communicated with the bottom of the top wall groove 261, and the first pin 34 of the test resistor 33 extends to the top wall groove 261 to be connected with the testing static elastic sheet 31. An upper cover 12 is arranged above the base 11, a pressing plate 121 which protrudes inwards is arranged on the inner side of the side wall of the upper cover 12, the bottom of the pressing plate 121 abuts against the top wall of the housing 2 to be in limit fit, and the pressing plate 121 and the plug-pull piece 24 are respectively used for limiting and matching the housing 2; the top wall of the upper cover 12 is provided with a button groove 124 recessed inward for receiving the test button 122, and a return spring 123 engaged with the test button 122 is provided in the button groove 124. The reset force of the test button 122 can be increased through the reset spring 123 and the test button 122, and the problem that the test button 122 cannot reset is avoided. In addition, the pressing plate 121 and the inserting and pulling piece 24 on the upper cover 12 respectively limit the housing 2 from the transverse direction and the longitudinal direction, so that the housing 2 can be more reliably fixed, and the housing 2 is prevented from sliding out of the base 11.

Further, a plurality of first limiting protrusions and a plurality of second limiting protrusions are arranged on the top wall of the second cavity 26, first limiting grooves 262 for limiting the testing of the static elastic sheet 31 are formed among the plurality of first limiting protrusions, and second limiting grooves 265 for limiting the testing of the dynamic elastic sheet 32 are formed among the plurality of second limiting protrusions.

Further, a side wall of the second cavity 26, which is far away from the first cavity 25, is provided with a side wall groove 27 which is recessed towards the inner side of the second cavity 26, the side wall groove 27 is used for accommodating a second pin 36 of the test resistor 33, the outer side of the side wall of the second cavity 26 is correspondingly provided with a second limiting rib 37 which is in limiting fit with the second pin 36 in the side wall groove 27, and the top side of the side wall of the second cavity 26 is correspondingly provided with a first limiting rib 35 which extends upwards to the top wall groove 261 and is in limiting fit with the first pin 34 above the side wall groove 27.

Further, the bottom of base 11 is equipped with to the bellied sand grip 111 in housing 2 bottom, and sand grip 111 supports and avoids housing 2 and base 11 contact in the bottom of housing 2, prevents that the ponding of steam agglutination from contacting circuit board 13 in the housing 2 in the base 11, ensures the reliability and the security of circuit breaker. The foregoing is a more detailed description of the invention, taken in conjunction with the accompanying preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the inventive concept, and all should be considered as falling within the protection scope of the invention.

Claims

1. The utility model provides a residual current operated circuit breaker, is including setting up housing (2), circuit board (13), test static shell fragment (31), test dynamic shell fragment (32) and test resistance (33) in the casing, its characterized in that: the casing (2) is sleeved outside the circuit board (13), the top wall of the casing (2) is provided with a testing static elastic sheet (31) and a testing dynamic elastic sheet (32) which are matched with each other, a testing button (122) is arranged on the casing corresponding to the testing dynamic elastic sheet (32), and the testing button (122) can drive the testing dynamic elastic sheet (32) to be in contact with the testing static elastic sheet (31) to conduct a testing loop; the outer side of the side wall of the housing (2) is provided with a concave part (21), a test resistor (33) is installed in the concave part (21), and a first pin (34) of the test resistor (33) extends out of the top of the concave part (21) and is connected with a test static elastic sheet (31).

2. The residual current operated circuit breaker according to claim 1, characterized in that: a limiting structure for limiting the circuit board (13) is arranged in the housing (2); the limiting structure comprises two first limiting plates (22) which are respectively arranged on the inner sides of two opposite side walls of the housing (2) and are positioned between the circuit board (13) and the concave part (21), and two inclined second limiting plates (23) which are respectively arranged on the inner sides of the two opposite side walls of the housing (2) and are positioned on one side of the circuit board (13) far away from the concave part (21); the two first limiting plates (22) and the two second limiting plates (23) are respectively in limiting fit with the circuit board (13) from two sides of the circuit board (13) and enable a gap to be reserved between the circuit board (13) and the side wall of the housing (2).

3. The residual current operated circuit breaker according to claim 1, characterized in that: the side opening of depressed part (21) sets up with the lateral wall of casing one side is relative, and the open-top of depressed part (21) stretches to between test static shell fragment (31) and test movable shell fragment (32), and first pin (34) of experimental resistance (33) stretch out from the open-top of depressed part (21) and are connected with test static shell fragment (31).

4. A residual current operated circuit breaker according to claim 3, wherein: the side wall of the housing (2) is provided with a side wall groove (27) corresponding to one side of the depressed part (21) close to the testing static elastic sheet (31), and a second pin (36) of the testing resistor (33) penetrates through the side wall groove (27) from the bottom opening of the depressed part (21) to be connected with the testing loop.

5. The residual current operated circuit breaker according to claim 4, characterized in that: the top side edge of lateral wall groove (27) is equipped with upwards extends to first pin (34) one side for spacing first spacing muscle (35) of first pin (34), the edge that depressed part (21) one side was kept away from in lateral wall groove (27) is equipped with the lateral wall that extends to casing one side to second pin (36) top, is used for spacing muscle (37) of second pin (36).

6. A residual current operated circuit breaker according to claim 3, wherein: the shell comprises a base (11) and an upper cover (12) above the base (11); the base (11) is equipped with plug (24) on the relative lateral wall that sets up with depressed part (21) opening, the lateral wall of housing (2) corresponds below depressed part (21) be equipped with plug (24) complex slot (240).

7. The residual current operated circuit breaker according to claim 6, characterized in that: the plug-pull piece (24) comprises a plug board (241) and a transverse board (242) connected between the plug board (241) and the side wall of the base (11), the plug board (241) can be inserted into the second cavity (26) and enables the slot (240) to be sleeved on the transverse board (242), and the plug board (241) is in limit fit with the inner side of the side wall of the second cavity (26).

8. The residual current operated circuit breaker according to claim 7, characterized in that: an upper cover (12) is arranged above the base (11), a pressing plate (121) with an inner protrusion is arranged on the inner side of the side wall of the upper cover (12), the bottom of the pressing plate (121) abuts against the top wall of the housing (2) for limiting and matching, and the housing (2) is respectively limited and matched through the pressing plate (121) and the plugging piece (24); a button groove (124) which is concave inwards and is used for accommodating the test button (122) is formed in the top wall of the upper cover (12), and a return spring (123) matched with the test button (122) is arranged in the button groove (124); the bottom of the base (11) is provided with a convex strip (111) protruding towards the bottom of the housing (2), and the convex strip (111) abuts against the bottom of the housing (2) to avoid the contact between the housing (2) and the base (11).

9. The residual current operated circuit breaker according to claim 1, characterized in that: the housing (2) comprises a first cavity (25) and a second cavity (26) which is arranged on one side of the first cavity (25) and communicated with each other, the top of the first cavity (25) protrudes upwards, the height of the first cavity (25) is higher than that of the second cavity (26), the circuit board (13) is installed in the first cavity (25), and an electronic element extending into the second cavity (26) is arranged on one side of the circuit board (13).

10. The residual current operated circuit breaker according to claim 9, characterized in that: the testing static elastic sheet (31) and the testing dynamic elastic sheet (32) are arranged on the outer side of the top wall of the second cavity (26), and the concave part (21) is arranged on the side wall of the second cavity (26) far away from the first cavity (25); a top wall groove (261) used for accommodating a testing static elastic sheet (31) and a first pin (34) is formed in one side of the top wall of the second cavity (26), the height of the testing static elastic sheet (31) is smaller than that of a testing dynamic elastic sheet (32), one end of the testing dynamic elastic sheet (32) is connected with the top wall of the second cavity (26), the other end of the testing dynamic elastic sheet (32) extends to the upper side of the top wall groove (261) to be matched with the testing static elastic sheet (31), the top opening of the concave portion (21) is communicated with the bottom of the top wall groove (261), and the first pin (34) of the testing resistor (33) extends into the top wall groove (261) to be connected with the testing static elastic sheet (31); an inner wall limiting strip (214) in limiting fit with the test resistor (33) is arranged on the inner wall of the concave part (21); the top wall of the second cavity (26) is provided with a plurality of first limiting bulges and a plurality of second limiting bulges, first limiting grooves (262) used for limiting and testing the static elastic sheet (31) are formed among the first limiting bulges, and second limiting grooves (265) used for limiting and testing the dynamic elastic sheet (32) are formed among the second limiting bulges.