USB interface

Abstract

The utility model belongs to the technical field of connectors, and discloses a USB interface. The design of the inner shielding shell in the USB interface provides a shielding layer, so that the influence of external electromagnetic interference on internal signals of the USB interface can be prevented, and meanwhile, the electromagnetic radiation of the USB interface is reduced, so that the USB interface can better meet the electromagnetic compatibility standard in the high-frequency and high-speed data transmission process, and the overall performance and reliability of the USB interface are improved; the shielding piece is arranged in the USB interface, one end of the shielding piece is in lap joint with the inner shielding shell, and at least one shielding terminal of the shielding piece is in lap joint with the grounding terminal of the 5PIN terminal strip, so that a grounding effect is formed, signal crosstalk between the 4PIN terminal strip and the 5PIN terminal strip is effectively reduced, and the accuracy and stability of data transmission are further improved; and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of connectors, in particular to a USB interface. Background Art

[0002] USB (Universal Serial Bus) is an external bus standard used to standardize the connection and communication between a computer and external devices, and is an interface technology applied in the PC field.

[0003] In the prior art, there is a lack of a shielding structure between the terminals inside the USB interface. For a USB interface lacking a shielding structure, crosstalk and other phenomena are likely to occur between the internal terminals, resulting in a decrease in signal quality. Signal distortion will affect the accuracy and stability of data transmission, unable to meet the test requirements of users, and affecting the user experience.

[0004] Therefore, there is an urgent need for a USB interface to solve the problems in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a USB interface, which effectively reduces the signal crosstalk between the 4PIN terminal row and the 5PIN terminal row, further improves the accuracy and stability of data transmission, and improves the user experience.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A USB interface, comprising:

[0008] A plastic body, including a 5PIN molding seat and a 4PIN molding seat detachably connected to the 5PIN molding seat. A tongue plate is provided at the front end of the 5PIN molding seat;

[0009] A terminal group, including a 5PIN terminal row and a 4PIN terminal row arranged in parallel with each other. The 5PIN terminal row is arranged on the 5PIN molding seat, and the 4PIN terminal row is arranged on the 4PIN molding seat;

[0010] An inner shielding shell, sleeved outside the plastic body, and an insertion interface is formed between the inner shielding shell and the tongue plate;

[0011] A shielding member, one end of the shielding member is embedded in the 4PIN molding base and lapped with the inner shielding shell. The other end of the shielding member is provided with a plurality of shielding terminals. The plurality of shielding terminals all face the direction of the mating interface and are located between the 4PIN terminal row and the 5PIN terminal row. At least one of the shielding terminals is lapped with the grounding terminal of the 5PIN terminal row. The shielding terminals of the shielding member are configured to perform signal shielding between at least some terminals of the 4PIN terminal row and at least some terminals of the 5PIN terminal row.

[0012] Optionally, the 5PIN terminal row includes a plurality of first terminals arranged at equal intervals. Each first terminal includes a first main body portion in a right-angled shape, and a first contact portion and a first pin portion respectively provided at both ends of the first main body portion;

[0013] The 4PIN terminal row includes a plurality of second terminals arranged at equal intervals. Each second terminal includes a second main body portion in a right-angled shape, and a second contact portion and a second pin portion respectively provided at both ends of the second main body portion. The end of the second contact portion bulges outwards and protrudes from the end face of the tongue plate;

[0014] The shielding member includes a third main body portion and at least three shielding terminals. The third main body portion is embedded in the 4PIN molding base and lapped with the inner shielding shell. One of the three shielding terminals is connected to the grounding terminal of the 5PIN terminal row, and the other two of the three shielding terminals are located between the plane where the first contact portion is located and the plane where the second contact portion is located.

[0015] Optionally, the tongue plate is provided with a first installation groove and a second installation groove. The first contact portion is arranged in the first installation groove, the second contact portion is arranged in the second installation groove, a third installation groove is provided between adjacent two second installation grooves, and the shielding terminal is arranged in the third installation groove.

[0016] Optionally, the end of the second contact portion is provided with an anti-warping locking point, and the 4PIN molding base is provided with an anti-warping locking groove, and the anti-warping locking point is clamped in the anti-warping locking groove.

[0017] Optionally, the third main body portion includes a first plate and a second plate. The second plate is perpendicular to the first plate. The shielding terminal is arranged at one end of the second plate far away from the first plate and is perpendicular to the second plate. Along the width direction of the second plate, hooks are respectively provided on both sides of the second plate, and the 4PIN molding base is provided with hook grooves, and the hooks are embedded in the hook grooves.

[0018] Optionally, the USB interface further includes an outer shielding shell, and the outer shielding shell is fixedly covered outside the inner shielding shell.

[0019] Optionally, a plurality of elastic force arms extending inwardly into the mating interface are integrally formed at the front end port of the inner shielding case.

[0020] Optionally, the wall of the inner shielding case at the mating interface is continuously bent to form an annular structure, and the head and tail of the annular structure are buckled and lapped through a dovetail groove structure.

[0021] Optionally, one of a plug-in groove or a plug-in portion is provided in the direction perpendicular to the tongue plate on the 5PIN molding base, and the other of the plug-in groove or the plug-in portion is provided on the 4PIN molding base, and the plug-in portion is inserted into the plug-in groove.

[0022] Optionally, one of the 4PIN molding base and the 5PIN molding base is provided with a hook, and the other is provided with a hook groove, and the hook is hooked in the hook groove.

[0023] Beneficial effects:

[0024] For the USB interface provided by the present utility model, the design of the inner shielding case provides a shielding layer, which can prevent the influence of external electromagnetic interference on the internal signals of the USB interface, and at the same time reduce the electromagnetic radiation of the USB interface itself. This enables the USB interface to better meet the electromagnetic compatibility standard during high-frequency and high-speed data transmission, improving the overall performance and reliability of the USB interface; and a shielding member is provided inside the USB interface, one end of the shielding member is lapped with the inner shielding case, and at least one shielding terminal of the shielding member is lapped with the grounding terminal of the 5PIN terminal row, thereby forming a grounding effect, effectively reducing the signal crosstalk between the 4PIN terminal row and the 5PIN terminal row, further improving the accuracy and stability of data transmission, and enhancing the user experience. Description of the drawings

[0025] Figure 1 is a schematic structural diagram of the USB interface provided by the present utility model;

[0026] Figure 2 is an exploded view of the USB interface provided by the present utility model;

[0027] Figure 3 is an exploded view of the 5PIN terminal row, 4PIN terminal row and shielding member provided by the present utility model;

[0028] Figure 4 is a schematic structural diagram of the USB interface provided by the present utility model with the inner shielding case and the outer shielding case removed;

[0029] Figure 5 is a top view of the assembled 5PIN terminal row, 4PIN terminal row and shielding member provided by the present utility model;

[0030] Figure 6 This is a side view after the assembly of the 5PIN terminal block, 4PIN terminal block and shield provided by the present utility model.

[0031] In the figure:

[0032] 110, 5PIN forming seat; 111, tongue plate; 1111, second installation groove; 1112, third installation groove; 120, 4PIN forming seat; 121, hook groove; 122, anti-warping card slot;

[0033] 200, terminal group; 210, 5PIN terminal block; 211, first terminal; 2111, first main body part; 2112, first pin part; 2113, first contact part; 2101, No. 5 terminal; 2102, No. 6 terminal; 2103, No. 7 terminal; 2104, No. 8 terminal; 2105, No. 9 terminal;

[0034] 220, 4PIN terminal block; 221, second terminal; 2211, second main body part; 2212, second pin part; 2213, second contact part; 2214, anti-warping card point;

[0035] 2201, No. 1 terminal; 2202, No. 2 terminal; 2203, No. 3 terminal; 2204, No. 4 terminal;

[0036] 300, inner shield case;

[0037] 400, shield; 410, third main body part; 411, first plate; 412, second plate; 413, hook part; 420, shield terminal;

[0038] 500, outer shield case. Detailed implementation manners

[0039] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0040] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0041] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0042] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left" and "right" are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] This embodiment provides a USB interface, as Figures 1-6 shown, which includes a plastic body, a terminal group 200, an inner shielding shell 300 and a shielding member 400. The plastic body includes a 5PIN molding base 110 and a 4PIN molding base 120 detachably connected to the 5PIN molding base 110. A tongue plate 111 is provided at the front end of the 5PIN molding base 110. The terminal group 200 includes a 5PIN terminal row 210 and a 4PIN terminal row 220 arranged in parallel with each other. The 5PIN terminal row 210 is arranged on the 5PIN molding base 110, and the 4PIN terminal row 220 is arranged on the 4PIN molding base 120. The inner shielding shell 300 is sleeved outside the plastic body, and an insertion interface is formed between the inner shielding shell 300 and the tongue plate 111. One end of the shielding member 400 is embedded in the 4PIN molding base 120 and overlaps with the inner shielding shell 300. The other end of the shielding member 400 is provided with a plurality of shielding terminals 420. The shielding terminals 420 of the plurality of shielding members 400 all face the direction of the insertion interface and are located between the 4PIN terminal row 220 and the 5PIN terminal row 210. At least one shielding terminal 420 overlaps with the grounding terminal of the 5PIN terminal row 210. The shielding terminals 420 of the shielding member 400 are used for signal shielding between at least some terminals of the 4PIN terminal row 220 and at least some terminals of the 5PIN terminal row 210.

[0044] The USB interface provided in this embodiment. The design of the inner shielding case 300 provides a shielding layer, which can prevent the influence of external electromagnetic interference on the internal signals of the USB interface, and at the same time reduces the electromagnetic radiation of the USB interface itself. This enables the USB interface to better meet the electromagnetic compatibility standard during high-frequency and high-speed data transmission, improving the overall performance and reliability of the USB interface. And a shielding member 400 is provided inside the USB interface. One end of the shielding member 400 is lapped with the inner shielding case 300, and at least one shielding terminal 420 of the shielding member 400 is lapped with the grounding terminal of the 5PIN terminal row 210, thereby forming a grounding effect, effectively reducing the signal crosstalk between the 4PIN terminal row 220 and the 5PIN terminal row 210, further improving the accuracy and stability of data transmission, and enhancing the user experience.

[0045] Optionally, as Figures 1-3 shown, both the 5PIN terminal row 210 and the 4PIN terminal row 220 are in a right-angle structure, and they are independently arranged on the same plane, such that the direction of insertion of the external connector into the mating interface and the direction in which the USB interface is plugged into the PCB board are in the same plane, realizing the structural form that the USB interface is inserted into the PCB board in an upright state. Compared with the connection method of the prior art USB interface that is plugged into the PCB board in a horizontal structure and then fixed by soldering, it effectively reduces the space occupied on the PCB board, can achieve the reduction of the area of the PCB board, and achieves the purpose of further reducing the specifications of electrical products. Or rather, in the case where the installation position on the PCB board is limited, using the structural form in an upright state to insert into the PCB board, there is no need to consider the problem of space avoidance, further reducing the manufacturing cost.

[0046] Optionally, as Figures 2-3As shown, the 5PIN terminal row 210 includes a plurality of first terminals 211 evenly spaced apart. Each first terminal 211 includes a first main body portion 2111 in a right-angled shape, and a first contact portion 2113 and a first pin portion 2112 respectively provided at both ends of the first main body portion 2111; the 4PIN terminal row 220 includes a plurality of second terminals 221 evenly spaced apart. Each second terminal 221 includes a second main body portion 2211 in a right-angled shape, and a second contact portion 2213 and a second pin portion 2212 respectively provided at both ends of the second main body portion 2211. The end of the second contact portion 2213 bulges outwards and protrudes from the end face of the tongue plate 111; the shielding member 400 includes a third main body portion 410 and at least three shielding terminals 420. The third main body portion 410 is embedded in the 4PIN molding base 120 and overlaps with the inner shielding shell 300. One of the three shielding terminals 420 is connected to the grounding terminal of the 5PIN terminal row 210, and the other two of the three shielding terminals 420 are located between the plane where the first contact portion 2113 is located and the plane where the second contact portion 2213 is located, so that at least part of the signals between the 4PIN terminal row 220 and the 5PIN terminal row 210 are shielded, reducing the phenomenon of signal crosstalk and improving the stability of transmission.

[0047] Specifically, as Figures 4-6As shown, in this embodiment, the 4PIN terminal block 220 includes 4 second terminals 221, and the 5PIN terminal block 210 includes 5 second terminals 221. The 4 second terminals 221 are defined in sequence as the VBUS power supply PIN (terminal 2201), the D- signal PIN (terminal 2202), the D+ signal PIN (terminal 2203), and the GND ground PIN (terminal 2204). The 5 first terminals 211 are defined in sequence as the StdA_SSRX- signal PIN (terminal 2101), the StdA_SSRX+ signal PIN (terminal 2102), the GND ground PIN (terminal 2103), the StdA_SSRX- signal PIN (terminal 2104), and the StdA_SSRX+ signal PIN (terminal 2105). In the width direction of the docking socket, three shielding terminals 420 are defined as the first shielding terminal, the second shielding terminal, and the third shielding terminal. The first shielding terminal is located between terminal 2201 and terminal 2202. The second shielding terminal is lapped with the GND ground PIN (terminal 2103) of the 5PIN terminal block 210. The third shielding terminal is located between terminal 2203 and terminal 2204. Both the first shielding terminal and the third shielding terminal are located between the plane where the 4PIN terminal block 220 is located and the plane where the 5PIN terminal block 210 is located. Thus, signal shielding is carried out between terminal 2202 and terminals 2104 and 2105, and signal shielding is carried out between terminal 2203 and terminals 2101 and 2102, so as to reduce signal crosstalk between terminals and improve the stability and accuracy of signal transmission. It should be noted that the specific signal transmission process and shielding principle of the USB interface provided in this embodiment are well-known technical means to those skilled in the art and will not be elaborated here.

[0048] Optionally, as Figure 2 and Figure 4 shown, the tongue plate 111 is provided with a first installation groove and a second installation groove 1111. The first contact portion 2113 is disposed in the first installation groove, and the second contact portion 2213 is disposed in the second installation groove 1111. A third installation groove 1112 is provided between two adjacent second installation grooves 1111, and the shielding terminal 420 is disposed in the third installation groove 1112. By providing the first installation groove, the second installation groove 1111, and the third installation groove 1112 on the tongue plate 111, the positions of the first contact portion 2113, the second contact portion 2213, and the shielding terminal 420 are more stable, improving the signal transmission effect and the shielding effect. Moreover, it simplifies the production and assembly process, improves the production efficiency and the product consistency, and optimizes the user experience.

[0049] Optionally, as Figures 3-4As shown, an anti-warping locking point 2214 is provided at the end of the second contact portion 2213, and an anti-warping slot 122 is provided on the 4PIN molding base 120. The anti-warping locking point 2214 is engaged in the anti-warping slot 122, ensuring that the second contact portion 2213 will not be displaced or have poor contact, thereby guaranteeing the integrity of the signal and the stability of the transmission rate, and meeting the high transmission rate requirements of the USB interface.

[0050] Optionally, the third main body portion 410 includes a first plate 411 and a second plate 412. The second plate 412 is perpendicular to the first plate 411. The shielding terminal 420 is disposed at one end of the second plate 412 away from the first plate 411 and is perpendicular to the second plate 412. Along the width direction of the second plate 412, hook portions 413 are respectively provided on both sides of the second plate 412. A hook groove 121 is provided on the 4PIN molding base 120. The hook portions 413 are embedded in the hook groove 121, which can prevent the third main body portion 410 from disengaging along the direction of the mating interface, improving the stability of the third main body portion 410, and further improving the stability of the shielding member 400.

[0051] Optionally, the shielding member 400 in this embodiment is a medium iron sheet. The medium iron sheet is integrally bent to form the third main body portion 410 and the shielding terminal 420, significantly improving the shielding effect and structural strength, simplifying the production process of the shielding member 400, and improving the production efficiency of the shielding member 400.

[0052] Optionally, the USB interface further includes an outer shielding case 500, and the outer shielding case 500 is fixedly covered outside the inner shielding case 300. By adding the outer shielding case 500 fixedly covered outside the inner shielding case 300, a double-layer shielding structure is formed in this embodiment of the USB interface, significantly enhancing the electromagnetic interference protection ability, improving the signal integrity, and enhancing the structural strength of the USB interface. In this embodiment, both the inner shielding case 300 and the outer shielding case 500 are metal shielding cases. By virtue of the metal conductivity, when the shielding member 400 is lapped with the inner shielding case 300, it is equivalent to being electrically connected to the outer shielding case 500 at the same time, which can improve the grounding effect and shielding effect, prevent external electromagnetic signals from interfering with the signal transmission inside the USB interface, and significantly enhance the structural strength of the USB interface.

[0053] Optionally, a plurality of elastic force arms extending inward into the mating interface are integrally formed at the front end port of the inner shielding case 300. The elastic force arms are used to press against an external connector inserted into the mating interface to enhance the insertion and extraction force and ensure the reliability of the electrical connection.

[0054] Optionally, the wall body of the inner shielding case 300 at the mating interface is continuously bent to form an annular structure, and the head and tail of the annular structure are latched and lapped through a dovetail groove structure, effectively improving the strength and sealing performance of the USB interface, preventing dust and impurities from entering the internal structure, and protecting the internal components.

[0055] Optionally, one of the 5PIN molding base 110 is provided with one of a socket or a plug-in part in a direction perpendicular to the tongue plate 111, and the 4PIN molding base 120 is provided with the other of the socket or the plug-in part. The plug-in part is inserted into the socket, so as to realize the rapid assembly of the plastic body, and significantly improve the production efficiency and the assembly speed.

[0056] Optionally, one of the 4PIN molding base 120 and the 5PIN molding base 110 is provided with a snap hook, and the other is provided with a snap groove 121. The snap hook is hooked in the snap groove 121, ensuring the stability after the 4PIN molding base 120 and the 5PIN molding base 110 are assembled. The hidden design of the snap hook and the snap groove 121 not only provides mechanical connection, but also makes the overall appearance of the USB interface more concise and beautiful, improving the appearance quality of the product.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. USB interface, characterized in that, include: The plastic body comprises a 5PIN molding seat (110) and a 4PIN molding seat (120) detachably connected to the 5PIN molding seat (110), wherein a tongue plate (111) is provided at the front end of the 5PIN molding seat (110); A terminal group (200) comprises a 5PIN terminal row (210) and a 4PIN terminal row (220) arranged in parallel with each other, the 5PIN terminal row (210) being arranged on the 5PIN molding seat (110), and the 4PIN terminal row (220) being arranged on the 4PIN molding seat (120); An inner shielding shell (300) is sleeved on the outside of the plastic body, and a plug-in interface is formed between the inner shielding shell (300) and the tongue plate (111); A shielding member (400), one end of which is embedded in the 4PIN molding seat (120) and overlapped with the inner shielding shell (300), and the other end of the shielding member (400) is provided with a plurality of shielding terminals (420), the plurality of shielding terminals (420) are all oriented toward the plug-in interface and are located between the 4PIN terminal row (220) and the 5PIN terminal row (210), at least one of the shielding terminals (420) is overlapped with the grounding terminal of the 5PIN terminal row (210), and the shielding terminal (420) of the shielding member (400) is configured to perform signal shielding between at least part of the terminals of the 4PIN terminal row (220) and at least part of the terminals of the 5PIN terminal row (210).

2. The USB interface according to claim 1, characterized in that: The 5PIN terminal row (210) comprises a plurality of first terminals (211) arranged at even intervals, each of the first terminals (211) comprising a first main body (2111) in a right angle shape and a first contact portion (2113) and a first pin portion (2112) respectively arranged at two ends of the first main body (2111); The 4PIN terminal row (220) comprises a plurality of second terminals (221) arranged at even intervals, each of the second terminals (221) comprising a right-angled second main body (2211) and a second contact portion (2213) and a second pin portion (2212) respectively arranged at two ends of the second main body (2211), the end of the second contact portion (2213) bulging outwards and protruding from the end surface of the tongue plate (111); The shielding component (400) includes a third main body (410) and at least three shielding terminals (420), wherein the third main body (410) is embedded in the 4PIN molded seat (120) and overlaps with the inner shielding shell (300), one of the three shielding terminals (420) is connected to the ground terminal of the 5PIN terminal row (210), and the other two of the three shielding terminals (420) are located between the plane where the first contact portion (2113) is located and the plane where the second contact portion (2213) is located.

3. The USB interface according to claim 2, characterized in that: The tongue plate (111) is provided with a first mounting groove and a second mounting groove (1111), the first contact portion (2113) is arranged in the first mounting groove, the second contact portion (2213) is arranged in the second mounting groove (1111), a third mounting groove (1112) is arranged between two adjacent second mounting grooves (1111), and the shielding terminal (420) is arranged in the third mounting groove (1112).

4. The USB interface according to claim 2, characterized in that: An anti-warping clamping point (2214) is provided at the end of the second contact portion (2213), an anti-warping clamping groove (122) is provided on the 4PIN molding seat (120), and the anti-warping clamping point (2214) is clamped in the anti-warping clamping groove (122).

5. The USB interface according to claim 2, characterized in that: The third main body (410) comprises a first plate (411) and a second plate (412), wherein the second plate (412) is perpendicular to the first plate (411), and the shielding terminal (420) is arranged at one end of the second plate (412) away from the first plate (411) and perpendicular to the second plate (412), and along the width direction of the second plate (412), hook portions (413) are respectively provided on both sides of the second plate (412), and a hook groove (121) is provided on the 4PIN molding seat (120), and the hook portion (413) is embedded in the hook groove (121).

6. The USB interface according to claim 1, characterized in that: The USB interface further comprises an outer shielding shell (500), wherein the outer shielding shell (500) is fixedly covered on the outside of the inner shielding shell (300).

7. The USB interface according to claim 1, characterized in that: The front end port of the inner shielding shell (300) is integrally formed with a plurality of elastic force arms extending inwardly into the plug-in interface.

8. The USB interface according to claim 1, characterized in that: The wall of the inner shielding shell (300) located at the plug-in interface is continuously bent to form a ring structure, and the head and tail of the ring structure are overlapped by a dovetail groove structure.

9. The USB interface according to claim 1, characterized in that: The 5PIN forming seat (110) is provided with one of the plugging slots or the plugging parts in a direction perpendicular to the tongue plate (111), and the 4PIN forming seat (120) is provided with the other of the plugging slots or the plugging parts, and the plugging part is plugged into the plugging slot.

10. The USB interface according to claim 1, characterized in that: One of the 4-pin molding seat (120) and the 5-pin molding seat (110) is provided with a hook, and the other is provided with a hook groove (121), and the hook is hooked in the hook groove (121).

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