A plug and socket assembly structure

Abstract

The utility model discloses a plug and socket assembly structure, include: plug and socket, the plug and socket all are provided with the shell, the upper end of shell is provided with detachable fixed wire block, the shell lower extreme of plug is provided with the insert piece, be provided with the conductive copper sheet in the socket, the insert piece and the conductive copper sheet top are provided with the wire group of being convenient for wiring, the shell lower extreme of socket is provided with the jack, the conductive copper sheet is aligned with the jack, the insert piece is inserted with the jack and is contacted with the conductive copper sheet. The utility model has the beneficial effects that: the shell and fixed wire block that set up among the plug and socket are general structural members, and the mould is opened conveniently, and the cost is saved, the simple structure, the installation of wiring is convenient, and the component assembly is convenient, simple, when the plug and socket are inserted, the connection stability is good, and the operation is convenient when separating, and the use effect is good.

Description

Technical Field

[0001] This utility model relates to the technical field of electrical equipment, and in particular to a plug and socket assembly structure. Background Technology

[0002] With social development and technological progress, people have begun to pursue a simpler and more comfortable life. In order to meet people's needs, various electrical products have emerged, and sockets and plugs have gradually become necessities in our lives.

[0003] The existing plugs and sockets have poor versatility in some components during manufacturing, which requires the development of multiple sets of molds for processing, thus increasing costs.

[0004] In order to reduce development costs and the number of molds required, structural improvements have been made to some components of the plug and socket. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of the existing technology, such as low component versatility and poor performance, and provides a plug and socket assembly structure with some components being universal and having good performance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a plug and socket assembly structure, comprising: a plug and a socket, both the plug and the socket being provided with a housing, a detachable wire fixing block being provided at the upper end of the housing, a prong being provided at the lower end of the plug's housing, a conductive copper sheet being provided inside the socket, a connecting wire group being provided on the top of the prong and the conductive copper sheet for easy wiring, a socket being provided at the lower end of the socket's housing, the conductive copper sheet being aligned with the socket, and the prong being inserted into the socket and in contact with the conductive copper sheet.

[0007] This plug and socket assembly includes a plug and a socket, each connected to a wire. Electrical connection is established through plugging and connecting the two components, creating a circuit. Both the plug and socket have a housing with a removable wire-fixing block at the top. This block secures the wires connected to the plug and socket, preventing them from slipping during use and causing leakage or open circuits. A prong is located at the bottom of the plug's housing, connecting to the wire. A socket has a hole at the bottom, into which the prong can be inserted for connection. Inside the socket is a conductive copper plate connected to the wire. When the prong is inserted into the socket, it contacts the conductive copper plate, establishing a circuit and ensuring power flow. A connecting assembly is located at the top of the prong and conductive copper plate, facilitating wire connection. This plug and socket assembly is easy to assemble and operate, ensuring a stable connection and good performance.

[0008] Preferably, the sidewall of the outer casing is provided with a plurality of recessed grooves, which are arc-shaped. The recessed grooves on the sidewall of the outer casing are arranged at equal intervals and are arc-shaped. This structure increases friction when plugging and unplugging the plug and socket, making operation convenient and simple.

[0009] Preferably, the top of the outer casing is provided with two symmetrically arranged limiting blocks, each with a trapezoidal cross-section. The lower end of the wire-fixing block is provided with a limiting groove, and the limiting blocks engage with the limiting grooves. Specifically, the two symmetrically arranged trapezoidal limiting blocks on the top of the outer casing, and the limiting groove at the lower end of the wire-fixing block, also trapezoidal, ensure effective wire fixing during installation. This structure simplifies and facilitates the wire-fixing process.

[0010] Preferably, the top of the outer casing is provided with a dividing block, the inner wall of which is provided with a clearance groove. The wire-fixing blocks are respectively arranged on both sides of the dividing block, and the sidewall of each wire-fixing block is provided with a mounting hole. Each wire-fixing block is provided with a screw, which is inserted into the mounting hole. The wire-fixing blocks are connected by screws that pass through the clearance groove. Specifically, the dividing block on the top of the outer casing is symmetrically arranged, and the wire-fixing blocks are respectively arranged on both sides of the dividing block. Mounting holes are provided on the inner sidewall of each wire-fixing block, and the screws pass through both the mounting holes and the clearance groove to connect the two wire-fixing blocks. Tightening the screws secures the wires to the wires. The dividing block controls the distance between the two wire-fixing blocks, preventing them from pressing on the wires and causing leakage, thus improving the performance.

[0011] Preferably, the inner wall of the wire-fixing block is provided with a plurality of wire-pressing blocks, which are arranged in parallel at equal intervals. The end face of each wire-pressing block is arc-shaped and has a plurality of wire-pressing protrusions. Specifically, the presence of a plurality of wire-pressing blocks on the inner wall of the wire-fixing block, arranged in parallel at equal intervals, and with arc-shaped end faces, creates a wire-pressing space, ensuring effective wire fixing. The wire-pressing protrusions on the end faces of the wire-pressing blocks improve the stability of the wire fixing and ensure good performance.

[0012] Preferably, the lower end of the housing is provided with a mounting base, and the mounting base has a mounting cavity. The mounting cavity in the plug housing is used to insert and install the prongs, and the mounting cavity in the socket housing is used to insert and install the conductive copper sheet. A mounting cap is mounted on the upper end of the mounting base. The mounting cap has an adjustment groove on its side wall and a wire hole on its top. The adjustment groove corresponds to the connecting assembly. Specifically, the mounting base at the lower end of the housing, with its internal mounting cavity, provides the mounting position for the prongs in the plug housing and the mounting position for the conductive copper sheet in the socket housing. The mounting cap at the upper end of the mounting base has an adjustment groove on its side wall, which communicates with the connecting assembly, allowing the tool to connect the wire to the connecting assembly through the adjustment groove, thus achieving electrical connection. Simultaneously, the wire hole on the top of the mounting cap provides a channel for the wire connected to the prongs. This structure facilitates wiring operations and improves usability.

[0013] Preferably, the connecting assembly includes a connecting block and a connecting stud. The connecting block has a threaded hole, and the upper ends of the insert and conductive copper sheet have transition holes. The connecting stud passes through the transition hole and connects to the threaded hole of the connecting block. The connecting stud is coaxially arranged with the adjusting groove. This connecting assembly includes a connecting block and a connecting stud. The connecting block has a threaded hole in its middle, allowing for a threaded connection between the connecting block and the connecting stud. Simultaneously, transition holes are provided at the upper ends of both the insert and the conductive copper sheet, allowing the connecting stud to pass through the transition holes and connect to the connecting block. This simplifies and facilitates wiring between the wires and the insert, improving assembly convenience and performance.

[0014] Preferably, the mounting cap has a fixing cavity inside, and an embedding groove is provided at the front end of the fixing cavity. The insert and conductive copper sheet are inserted into the embedding groove, and the connecting pressure block is placed in the fixing cavity. Specifically, the fixing cavity inside the mounting cap, with the embedding groove at its front end, is used to engage the insert or conductive copper sheet. When the mounting cap and mounting base are assembled, the embedding groove on the mounting cap can fix the insert or conductive copper sheet, ensuring stable assembly. This results in a stable and reliable connection when the plug and socket are inserted, ensuring convenient assembly and good performance.

[0015] Preferably, the connecting pressure block is an arc-shaped block, and the top sidewalls of the conductive copper sheet and the insert are provided with several clamping grooves. The arc-shaped connecting pressure block improves the clamping effect on the wires during wiring, ensuring stable connections. Simultaneously, the clamping grooves on the top sidewalls of the conductive copper sheet and the insert further enhance the clamping effect during motor wiring, thus ensuring stable connections, resulting in better assembly and performance.

[0016] Preferably, the conductive copper sheet has three conductive legs, two of which are arranged perpendicular to the socket and the other is arranged parallel to the socket. Each conductive leg has a bent protrusion at its bottom. Specifically, a conductive leg is located at the lower end of the conductive copper sheet, with two legs arranged parallel to each other and perpendicular to the socket, and the other leg parallel to the socket. The bent protrusion at the bottom of this conductive leg makes opposing contact. This structure improves the rigidity of the conductive copper sheet, ensuring stable insertion of the plug and socket, and thus guaranteeing good performance.

[0017] The beneficial effects of this utility model are: the outer shell and wire fixing block in the plug and socket are universal structural parts, which are convenient for mold making and save costs; the structure is simple, the wiring and installation are convenient, the components are easy to assemble, and it is simple; when the plug and socket are plugged in, the connection stability is good, and when they are separated, the operation is convenient and the use effect is good. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the present invention; Figure 2 This is an exploded view of the plug in this utility model; Figure 3 This is an exploded view of the socket in this utility model; Figure 4 This is a three-dimensional view of the fixed line block in this utility model. Figure 5 This is a perspective view of the mounting cap in this utility model. Figure 6 yes Figure 2 Enlarged view at point A Figure 7 This is a three-dimensional view of the conductive copper sheet in this utility model.

[0019] In the attached diagram, 1. Plug, 2. Socket, 3. Housing, 4. Wire fixing block, 5. Insert, 6. Conductive copper sheet, 7. Socket, 8. Connecting clamp, 9. Connecting stud, 10. Transition hole, 30. Recessed groove, 31. Limiting block, 32. Dividing block, 33. Relief groove, 34. Mounting base, 35. Mounting cavity, 36. Mounting cap, 37. Adjustment groove, 38. Wire hole, 39. Fixing cavity, 40. Limiting groove, 41. Mounting hole, 42. Screw, 43. Wire clamping block, 44. Wire clamping protrusion, 60. Conductive support foot, 61. Bending protrusion, 80. Threaded hole, 81. Clamping groove, 390. Embedded groove. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components illustrated in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0024] Example 1, such as Figure 1-7 As shown, a plug and socket assembly structure includes: a plug 1 and a socket 2. The plug 1 is provided with a housing 3. A wire fixing block 4 is provided at the upper end of the housing 3. A plug 5 is provided at the lower end of the housing 3 of the plug 1. A conductive copper sheet 6 is provided inside the socket 2. A connecting group is provided on the top of the plug 5 and the conductive copper sheet 6. A socket hole 7 is provided at the lower end of the housing 3 of the socket 2. The conductive copper sheet 6 is aligned with the socket hole 7. The plug 5 is inserted into the socket hole 7 and in contact with the conductive copper sheet 6.

[0025] The outer casing 3 has several recessed grooves 30 on its side wall, and the recessed grooves 30 are arc-shaped.

[0026] The top of the outer shell 3 is provided with two symmetrically arranged limiting blocks 31. The limiting blocks 31 have a trapezoidal cross section. The lower end of the fixing block 4 is provided with a limiting groove 40. The limiting blocks 31 are engaged with the limiting groove 40.

[0027] The top of the outer casing 3 is provided with a dividing block 32, and the inner wall of the dividing block 32 is provided with a relief groove 33. The wire fixing blocks 4 are respectively provided on both sides of the dividing block 32. The side wall of the wire fixing block 4 is provided with a mounting hole 41. The wire fixing block 4 is provided with a screw 42 and the screw is inserted into the mounting hole 41. The wire fixing block 4 is connected by the screw 42 and the screw 42 passes through the relief groove 33.

[0028] The top of the wire fixing block 4 is provided with a number of wire pressing blocks 43, which are arranged in parallel at equal intervals. The end face of the wire pressing block 43 is an arc-shaped surface, and the end face of the wire pressing block 43 is provided with a number of wire pressing protrusions 44.

[0029] The lower end of the outer casing 3 is provided with a mounting base 34, and the mounting base 34 is provided with a mounting cavity 35. The mounting cavity 35 in the outer casing 3 of the plug 1 is used to insert and install the plug 5, and the mounting cavity 35 in the outer casing 3 of the socket 2 is used to insert and install the conductive copper sheet 6. The upper end of the mounting base 34 is provided with a mounting cap 36, the side wall of the mounting cap 36 is provided with an adjustment groove 37, and the top of the mounting cap 36 is provided with a wire hole 38. The adjustment groove 37 corresponds to the connection group.

[0030] The connecting assembly includes a connecting pressure block 8 and a connecting stud 9. The connecting pressure block 8 is provided with a threaded hole 80. The upper ends of the insert 5 and the conductive copper sheet 6 are provided with transition holes 10. The connecting stud 9 passes through the transition hole 10 and connects with the threaded hole 80 of the connecting pressure block 8. The connecting stud 9 is coaxially arranged with the adjusting groove 37.

[0031] The mounting cap 36 has a fixing cavity 39 inside, and the front end of the fixing cavity 39 has an embedding groove 390. The insert 5 and the conductive copper sheet 6 are inserted into the embedding groove 390, and the connecting pressure block 8 is placed in the fixing cavity 39.

[0032] The connecting pressure block 8 is an arc-shaped block, and the top sidewalls of the conductive copper sheet 6 and the insert 5 are provided with several pressing grooves 81.

[0033] The conductive copper sheet 6 is provided with three conductive legs 60, two of which are arranged perpendicular to the socket 7, and the other conductive leg 60 is arranged parallel to the socket 7. The bottom of the conductive leg 60 is provided with a bent protrusion 61.

[0034] The working principle of this utility model is as follows: Figure 1-7As shown, this plug-socket assembly includes a plug 1 and a socket 2, each connected to a wire. Electrical connection is achieved through plugging them in, establishing a circuit. Both the plug 1 and socket 2 have a housing 3. A wire-fixing block 4 is located at the upper end of the housing 3. This fixing block is detachable and secures the wires connected to the plug 1 and socket 2, preventing them from slipping off during use and causing leakage or open circuit. A prong 5 is located at the lower end of the housing 3 of the plug 1, connecting to the wire. A socket 7 is located at the lower end of the socket 2, into which the prong 5 can be inserted for connection. A conductive copper plate 6 is located inside the socket 2, connecting to the wire. When the prong 5 is inserted into the socket 7, it contacts the conductive copper plate 6, establishing a circuit and ensuring power supply. A connecting group is located at the upper end of the prong 5 and the conductive copper plate 6, facilitating wire connection. The plug 1 and socket 2 are easy to assemble and operate, and the connection is stable and effective during plugging.

[0035] Among them, several recessed grooves 30 are arranged at equal intervals on the side wall of the outer shell 3, and the shape of the recessed grooves 30 is arc-shaped. This structure increases the friction when plugging and unplugging the plug 1 and socket 2, making the operation convenient and simple.

[0036] Two limiting blocks 31 are provided on the top of the outer casing 3. The two limiting blocks 31 are arranged symmetrically and are trapezoidal. A limiting groove 40 is provided at the lower end of the wire fixing block 4. The limiting groove 40 is also trapezoidal. When the wire fixing block 4 is installed, the limiting blocks 31 are inserted into the limiting groove 40. This structure can ensure the wire fixing effect when connecting wires. The wire fixing operation is simple and convenient.

[0037] The casing 3 has a dividing block 32 on its top, which is symmetrically arranged. Wire fixing blocks 4 are arranged on both sides of the dividing block 32. Mounting holes 41 are provided on the inner sidewalls of the wire fixing blocks 4. Screws 42 pass through the mounting holes 41 and the clearance grooves 33 to connect the two wire fixing blocks 4. By tightening the screws 42, the wire fixing blocks 4 secure the wires. The dividing block 32 controls the distance between the two wire fixing blocks 4, preventing the wire fixing blocks 4 from pressing on the wires and causing leakage, thus improving the performance.

[0038] The inner wall of the wire fixing block 4 is provided with several wire pressing blocks 43. The wire pressing blocks 43 are equally spaced and arranged in parallel. The end face of the wire pressing block 43 is arc-shaped. This structure can form a wire pressing space to ensure the wire fixing effect. A wire pressing protrusion 44 is provided on the end face of the wire pressing block 43. This structure can improve the wire fixing stability and ensure good performance.

[0039] The mounting base 34 is provided at the lower end of the outer shell 3. The mounting base 34 has an internal mounting cavity 35. The mounting cavity 35 in the outer shell 3 of the plug 1 provides a mounting position for the insert 5, and the mounting cavity 35 in the outer shell 3 of the socket 2 provides a mounting position for the conductive copper sheet 6. The mounting cap 36 is provided at the upper end of the mounting base 34. The side wall of the mounting cap 36 is provided with an adjustment groove 37. The adjustment groove 37 is connected to the connecting group, so that the tool can connect the wire to the connecting group through the adjustment groove 37 to realize the electrical connection of the wire. At the same time, a wire hole is provided at the top of the mounting cap 36 to provide a channel for the wire to connect to the insert 5. This structure facilitates wiring operations and improves the performance.

[0040] The connection assembly includes a connecting pressure block 8 and a connecting stud 9. The connecting pressure block 8 has a threaded hole 8080 in the middle, allowing for a threaded connection between the connecting pressure block 8 and the connecting stud 9. Additionally, transition holes 10 are provided at the upper ends of both the insert 5 and the conductive copper sheet 6, allowing the connecting stud 9 to pass through the transition holes 10 and connect to the connecting pressure block 8. This design simplifies and facilitates wiring between the wires and the insert 5, improving assembly convenience and overall performance.

[0041] The mounting cap 36 has a fixing cavity 39 inside, and an embedding groove 390 at the front end of the fixing cavity 39. The embedding groove 390 is used to engage the insert 5 or the conductive copper sheet 6. When the mounting cap 36 is assembled with the mounting base 34, the embedding groove 390 of the mounting cap 36 can fix the insert 5 or the conductive copper sheet 6, ensuring the stability of the assembly. When the plug 1 and socket 2 are plugged in, the connection is stable and reliable, ensuring convenient assembly and good performance. At the same time, a mounting guide groove is provided on the side wall of the mounting cap 36, and a mounting guide strip is provided on the upper inner wall of the outer shell 3. When assembling the upper end of the outer shell 3 with the connecting body of the mounting cap 36 and the mounting base 35, the mounting guide strip is embedded in the mounting guide groove, facilitating sliding installation.

[0042] Among them, the connecting pressure block 8 is an arc-shaped block. This structure can improve the clamping effect on the wire when wiring, and ensure the connection stability. At the same time, several clamping grooves 81 are provided on the top side wall of the conductive copper sheet 6 and the insert 5. These clamping grooves 81 can improve the clamping effect when wiring the motor, thereby ensuring the connection stability, resulting in good assembly and good performance.

[0043] The conductive copper sheet 6 has a conductive support foot 60 at its lower end. Two of the conductive support feet 60 are arranged in parallel and perpendicular to the socket 7, while the other conductive support foot 60 is arranged in parallel to the socket 7. A bent protrusion is provided at the bottom of the conductive support foot 60, and the bent protrusion is in contact with the socket. This structure can improve the rigidity of the conductive copper sheet 6, thereby ensuring a stable connection when the plug 1 and the socket 2 are plugged in, and thus ensuring good performance.

[0044] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A plug and socket assembly structure, characterized in that, include: A plug (1) and a socket (2) are provided with a housing (3). A detachable wire fixing block (4) is provided at the upper end of the housing (3). A plug (5) is provided at the lower end of the housing (3) of the plug (1). A conductive copper sheet (6) is provided inside the socket (2). A connecting group for easy wiring is provided on the top of the plug (5) and the conductive copper sheet (6). A socket hole (7) is provided at the lower end of the housing (3) of the socket (2). The conductive copper sheet (6) is aligned with the socket hole (7). The plug (5) is inserted into the socket hole (7) and in contact with the conductive copper sheet (6).

2. The plug and socket assembly structure according to claim 1, characterized in that, The outer shell (3) has several recessed grooves (30) on its side wall, and the recessed grooves (30) are arc-shaped.

3. The plug and socket assembly structure according to claim 1, characterized in that, The top of the outer shell (3) is provided with two symmetrically arranged limiting blocks (31). The cross section of the limiting block (31) is trapezoidal. The lower end of the fixing block (4) is provided with a limiting groove (40). The limiting block (31) is engaged with the limiting groove (40).

4. The plug and socket assembly structure according to claim 1, characterized in that, The top of the outer casing (3) is provided with a dividing block (32), the inner wall of the dividing block (32) is provided with a relief groove (33), the wire fixing blocks (4) are respectively provided on both sides of the dividing block (32), the side wall of the wire fixing block (4) is provided with a mounting hole (41), the wire fixing block (4) is provided with a screw (42) and the screw is inserted into the mounting hole (41), the wire fixing block (4) is connected by the screw (42) and the screw (42) passes through the relief groove (33).

5. The plug and socket assembly structure according to claim 1, characterized in that, The inner wall of the wire fixing block (4) is provided with a number of wire pressing blocks (43), which are arranged in parallel at equal intervals. The end face of the wire pressing block (43) is an arc-shaped surface, and the end face of the wire pressing block (43) is provided with a number of wire pressing protrusions (44).

6. The plug and socket assembly structure according to claim 1, characterized in that, The lower end of the outer shell (3) is provided with a mounting base (34), and the mounting base (34) is provided with a mounting cavity (35). The mounting cavity (35) in the outer shell (3) of the plug (1) is used to insert and install the insert (5). The mounting cavity (35) in the outer shell (3) of the socket (2) is used to insert and install the conductive copper sheet (6). The upper end of the mounting base (34) is provided with a mounting cap (36). The side wall of the mounting cap (36) is provided with an adjustment groove (37). The top of the mounting cap (36) is provided with a wire hole (38). The adjustment groove (37) corresponds to the connection group.

7. A plug and socket assembly structure according to claim 6, characterized in that, The connecting assembly includes a connecting block (8) and a connecting stud (9). The connecting block (8) is provided with a threaded hole (80). The upper ends of the insert (5) and the conductive copper sheet (6) are provided with transition holes (10). The connecting stud (9) passes through the transition hole (10) and connects to the threaded hole (80) of the connecting block (8). The connecting stud (9) is coaxially arranged with the adjusting groove (37).

8. The plug and socket assembly structure according to claim 7, characterized in that, The mounting cap (36) has a fixing cavity (39) inside, and the front end of the fixing cavity (39) has an embedding groove (390). The insert (5) and the conductive copper sheet (6) are inserted into the embedding groove (390), and the connecting pressure block (8) is placed in the fixing cavity (39).

9. A plug and socket assembly structure according to claim 7, characterized in that, The connecting pressure block (8) is an arc-shaped block, and the top sidewalls of the conductive copper sheet (6) and the insert (5) are provided with several pressing grooves (81).

10. The plug and socket assembly structure according to claim 1, characterized in that, The conductive copper sheet (6) is provided with three conductive legs (60), two of which are arranged perpendicular to the socket (7) and the other conductive leg (60) is arranged parallel to the socket (7). The bottom of the conductive leg (60) is provided with a bent protrusion (61).

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