An electrical connector assembly and a communication device

Abstract

An electrical connector assembly and a communication device, the electrical connector assembly comprising: a terminal module; a shielding cage formed with a top plate, a bottom plate, a left side plate, a right side plate and a back end plate combined with each other and collectively surrounding a mating cavity and forming an opening at a front end, the terminal module being arranged in the shielding cage; a first extension plate further extended forward from a front end edge of the left side plate; a second extension plate further extended forward from a front end edge of the right side plate; an upper cover plate fixedly connected with an upper edge of the first extension plate, an upper edge of the second extension plate and a front end position of the top plate; a lower cover plate fixedly connected with a lower edge of the first extension plate, a lower edge of the second extension plate and a front end position of the bottom plate; a front end edge of the upper plate body, a front end edge of the upper side plate, a front end edge of the first extension plate, a front end edge of the second extension plate and a front end edge of the lower cover plate collectively form a mating port, and a plane where the mating port is located is inclined along a front-rear direction.

Description

TECHNICAL FIELD

[0001] The present application relates to an electrical connector assembly and a communication device. BACKGROUND

[0002] A common challenge faced by developers of electrical systems is heat management. Heat generated by electronic devices within the system can reduce the performance of the electronic devices and even damage components of the system, such as electrical connectors. Electrical connectors can be used to transmit data and / or power between different systems or devices. Data signals can be transmitted in the form of optical signals and / or electrical signals through communication cable(s). For example, IC connectors (PGA, etc.), IO connectors (Displayport, VGA, DVI, HDMI, USB, etc.), fiber optic connectors (FC, SC, ST, LC, D4, DIN, MU, MT, etc.), optical communication connectors (SFP, QSFP, OSFP, etc.), filter connectors, CATV connectors, backplane connectors, memory stick / memory connectors (DDR, SIMM, DIMM, PCI, SIM, etc.), high-definition television connectors (RF coaxial connectors, etc.), flexible circuit board connectors (FPC, FFC, etc.), network cable connectors (RJ45, etc.), audio-video (AV) connectors, battery connectors, and the like.

[0003] In actual use, due to the need for functions, etc., multiple electrical connectors are often densely arranged in a device body. However, the space left for the densely arranged multiple electrical connectors is limited. As the power of the electrical connectors continues to increase, a large amount of heat is generated, and the heat between the electrical connectors is concentrated, which is not conducive to heat dissipation. On the other hand, the densely arranged multiple electrical connectors are not conducive to plugging and docking with a docking connector module (such as an optical module handle). In addition, in some special cases, the external space left for the docking connector module is also limited. SUMMARY

[0004] The purpose of the present application is to provide an electrical connector assembly and a communication device, which is suitable for multiple densely arranged settings and can facilitate heat dissipation.

[0005] To achieve the purpose, the present application provides the following technical solutions:

[0006] An electrical connector assembly, comprising:

[0007] A terminal module formed with an insulating body and a plurality of terminal pieces fixed to the insulating body;

[0008] A shielding cage is formed with a top plate, a bottom plate arranged opposite to the top plate in the up-down direction, a left side plate connecting the top plate and the bottom plate on one side, a right side plate arranged opposite to the left side plate and connecting the top plate and the bottom plate on the other side, and a back end plate combined with the back end edges of the left side plate and the right side plate;

[0009] The top plate, the bottom plate, the left side plate, the right side plate and the back end plate jointly enclose a docking cavity and form an opening at the front end, and the back end edge of the bottom plate or the back end edge of the top plate and the back end plate form a mounting port, and the terminal module is assembled in the shielding cage through the mounting port;

[0010] A first extension plate is further extended forward from the front end edge of the left side plate;

[0011] A second extension plate is further extended forward from the front end edge of the right side plate;

[0012] An upper cover plate includes an upper plate body, an upper connecting plate extended downward from the back end edge of the upper plate body, an upper fixing plate extended backward from the back end edge of the upper connecting plate, and two upper side plate portions arranged at the two side edges of the upper cover plate and extended downward, the lower edges of the two upper side plate portions are fixedly connected with the upper edges of the first extension plate and the second extension plate respectively, and the upper fixing plate is fixedly connected with the front end position of the top plate;

[0013] A lower cover plate, the two side edges of the lower cover plate are fixedly connected with the lower edges of the first extension plate and the second extension plate respectively, and the back end position of the lower cover plate is fixedly connected with the front end position of the bottom plate;

[0014] The front end edge of the upper plate body, the front end edge of the upper side plate portion, the front end edge of the first extension plate, the front end edge of the second extension plate and the front end edge of the lower cover plate jointly form a docking port, and the plane of the docking port is inclined in the front-back direction.

[0015] Further, the lower edges of the upper side plate portions are fixedly connected with the upper edges of the first extension plate and the second extension plate through dovetail groove structures and form a joint seam, and further comprising an external elastic sheet piece fixedly attached to the outer side surfaces of the upper side plate portions and the first extension plate, and the external elastic sheet piece covers at least part of the joint seam.

[0016] Further, the lower cover plate includes a lower plate body, a lower connecting plate extended upward from the back end edge of the lower plate body, a lower fixing plate extended backward from the back end edge of the lower connecting plate, and two lower side plate portions arranged at the two side edges of the lower plate body and extended upward, the lower edges of the two lower side plate portions are fixedly connected with the upper edges of the first extension plate and the second extension plate respectively, and the lower fixing plate is fixedly connected with the front end position of the bottom plate.

[0017] Further, a plurality of through holes are formed in the upper connecting plate in the front-rear direction.

[0018] Further, a protruding portion is formed on the top plate upwardly at a position close to the front end, and the upper fixing plate is attached to the outer surface of the top plate at the front end position and is stopped at the protruding portion rearwardly.

[0019] Further, an elastic arm in cantilever shape is formed on the bottom plate at a position close to the front end, and a processing gap is formed on both sides of the elastic arm, and the elastic arm comprises a portion inclined into the counter-cavity.

[0020] A clearance is formed on the lower cover plate and corresponds to the elastic arm, and the clearance is used for allowing the elastic deformation of the elastic arm.

[0021] Further, the clearance comprises a portion formed on the lower fixing plate and a portion extended and formed on the lower connecting plate, and the clearance separates the lower fixing plate into two parts in the left-right direction.

[0022] Further, it further comprises an upper heat dissipation module assembled on the top plate, and the front end edge of the upper heat dissipation module forms a limiting portion, and the limiting portion is formed above the upper fixing plate.

[0023] Further, a plurality of air flow channels arranged in the left-right direction are formed in the upper heat dissipation module in the front-rear direction, and the through holes formed on the upper connecting plate of the upper cover plate are communicated with the air flow channels in the front-rear direction.

[0024] To achieve the above object, the application further provides the following technical scheme.

[0025] A communication device comprises a plurality of electric connector assemblies as described above, and further comprises a device box, and the plurality of electric connector assemblies are arranged in the device box in the first direction, and the counter-interfaces of the electric connector assemblies are exposed outwardly through one end surface of the device box, and the plane where the counter-interfaces are located is parallel or flush with the plane where the end surface is located.

[0026] Compared with the prior art, the electric connector assembly is suitable for dense arrangement and can facilitate heat dissipation. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a perspective view of the communication device of the application.

[0028] Figure 2 is a top view of the communication device of the application after removing the upper cover.

[0029] Figure 3is a perspective view of a plurality of electrical connector assemblies arranged within a communication device of the present application.

[0030] Figure 4 is a perspective view of an electrical connector assembly of the present application, specifically illustrating the perspective view of the electrical connector assembly when mated with an illustrative optical module plug.

[0031] Figure 5 is a perspective view of an electrical connector assembly of the present application, specifically, without an optical module plug inserted.

[0032] Figure 6 is a partial perspective exploded view of an electrical connector assembly of the present application, with the same perspective as Figure 5 .

[0033] Figure 7 is a partial perspective exploded view of an electrical connector assembly of the present application, with a different perspective than Figure 5 .

[0034] Figure 8 is a perspective view of the electrical connector assembly shown in Figure 5 from another angle.

[0035] Figure 9 is a partial perspective exploded view of an electrical connector assembly of the present application, with a different perspective than Figure 5 .

[0036] Figure 10 is a further perspective exploded view of the electrical connector assembly shown in Figure 9 .

[0037] Figure 11 is a cross-sectional view taken along line A-A in Figure 5 .

[0038] Figure 12 is an enlarged view of the structure within the dashed box in Figure 11 . DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0040] In the present application, all directions are taken as reference with Figure 4 , the direction of the X axis is defined as the left-right direction, wherein the positive direction of the X axis is right; the direction of the Y axis is defined as the up-down direction, wherein the positive direction of the Y axis is up; and the direction of the Z axis is defined as the front-back direction, wherein the positive direction of the Z axis is back.

[0041] Please refer to Figure 1 and Figure 2 The diagram illustrates a communication device disclosed in this application. This communication device can be, for example, a module within a communication base station. The communication device includes a device housing 4 and a plurality of electrical connector assemblies 100 assembled within the device housing 4. A row of mounting holes (not labeled) is formed on one end face 41 of the device housing 4. The plurality of electrical connector assemblies 100 are obliquely assembled within the device housing 4, and the mating interface 10 of each electrical connector assembly 100 protrudes outward from the device housing 4 through the mounting holes. Each electrical connector assembly 100 is used to connect with an external optical module plug 200 (…). Figure 4 The diagram illustrates, but does not show, the cable portion connecting to the optical module plug 200. This connection enables signal transmission. In a preferred embodiment, the plane of the interface 10 is parallel or flush with the plane of the end face 41.

[0042] Please refer to the reference. Figures 3 to 12 As shown, the electrical connector assembly 100 includes a terminal module 1 and a shielding cage 2 that mates with the terminal module 1. The terminal module 1 has an insulating body 11 and a plurality of terminal pieces 12 fixed to the insulating body 11. The front end of the insulating body 11 has an insertion port (not shown). Each terminal piece 12 includes a fixing section (not shown, not labeled) fixed to the insulating body 11, an elastic contact section (not labeled) protruding into the insertion port, and a mating section (not shown, not labeled) protruding downwards from the lower surface of the insulating body 11 for electrical connection and fixation with the circuit board 300.

[0043] Furthermore, the shielding cage 2 includes a top plate 21, a bottom plate 22 disposed opposite to the top plate 21 in a vertical direction, a left side plate 23 connecting one side of the top plate 21 and the bottom plate 22, a right side plate 24 connecting the other side of the top plate 21 and the bottom plate 22 and disposed opposite to the left side plate 23, and a rear end plate 25 joined to the rear end edges of the top plate 21, the left side plate 23, and the right side plate 24. The top plate 21, the bottom plate 22, the left side plate 23, the right side plate 24, and the rear end plate 25 together form a docking cavity (not labeled) with an opening at the front end. An installation port 202 is formed between the rear end edge of the bottom plate 22 and the rear end plate 25. The terminal module 1 is assembled in the shielding cage 2 through the installation port 202. The insertion port of the terminal module 1 communicates forward with the docking cavity. In other embodiments, the mounting opening 202 may also be formed between the rear end edge of the top plate 21 and the rear end plate 25; in other words, the top plate 21 and the bottom plate 22 are relative to each other.

[0044] Please refer to the reference. Figures 4 to 12As shown, the front end edge of the left side plate 23 further extends forward to form a first extension plate 231. The front end edge of the right side plate 24 further extends forward to form a second extension plate 241. The first extension plate 231 and the second extension plate 241 are different in length along the front-rear direction. In the embodiment shown in the drawings, the first extension plate 231 is longer than the second extension plate 241. Of course, the second extension plate 241 can also be longer than the first extension plate 231, depending on the inclination direction when the electrical connector assembly is assembled into the equipment cabinet 4. The shielding cage 2 further comprises an upper cover plate 26, which comprises an upper plate body 261, an upper connecting plate 262 extending downward from the rear end edge of the upper plate body 261, an upper fixing plate 263 extending rearward from the rear end edge of the upper connecting plate 262, and two upper side plate portions 264 provided at the two side edges of the upper cover plate 26 and extending downward. The lower edges of the two upper side plate portions 264 are fixedly connected to the upper edges of the first extension plate 231 and the second extension plate 241, respectively. The upper fixing plate 263 is fixedly connected to the front end position of the top plate 21, preferably by welding. Preferably, the upper fixing plate 263 is attached to the outer surface of the front end position of the top plate 21.

[0045] Further, the shielding cage 2 further comprises a lower cover plate 27, the two side edges of the lower cover plate 27 are fixedly connected to the lower edges of the first extension plate 231 and the second extension plate 241, respectively. The rear end position of the lower cover plate 27 is fixedly connected to the front end position of the bottom plate 22. In the preferred embodiment, the lower cover plate 27 comprises a lower plate body 271, a lower connecting plate 272 extending upward from the rear end edge of the lower plate body 271, a lower fixing plate 273 extending rearward from the rear end edge of the lower connecting plate 272, and two lower side plate portions 274 provided at the two side edges of the lower plate body 271 and extending upward. The lower edges of the two lower side plate portions 274 are fixedly connected to the upper edges of the first extension plate 231 and the second extension plate 241, respectively. The lower fixing plate 273 is fixedly connected to the front end position of the bottom plate 22, preferably by welding. Preferably, the lower fixing plate 273 is attached to the outer surface of the front end position of the bottom plate 22.

[0046] The front end edge of the upper plate body 261, the front end edge of the upper side plate part 264, the front end edge of the first extension plate 231, the front end edge of the second extension plate 241, and the front end edge of the lower cover plate 27 jointly form the mating interface 10, and the plane of the mating interface 10 is inclined along the front-rear direction. In the preferred embodiment, the front end edge of the upper plate body 261, the front end edge of the upper side plate part 264, the front end edge of the first extension plate 231, the front end edge of the second extension plate 241, the front end edge of the lower plate body 271, and the front end edge of the lower side plate part 274 jointly form the mating interface 10, and the plane of the mating interface 10 is inclined along the front-rear direction.

[0047] Please refer to Figures 4 to 12 As shown in the drawings, in the preferred embodiment, the lower edge of the upper side plate part 264 and the upper edge of the first extension plate 231 are fixedly connected by a dovetail groove structure and form a joint 230. The shielding cage 2 further comprises an external spring piece 5, which is fixedly connected to the outer surface of the upper side plate part 264 and the outer surface of the first extension plate 231, and the external spring piece 5 covers at least part of the joint 230. In a more preferred embodiment, the upper edge of the lower side plate part 274 and the lower edge of the first extension plate 231 are also fixedly connected by a dovetail groove structure and form a joint 240. The external spring piece 5 is fixedly connected to the outer surface of the upper side plate part 264, the outer surface of the first extension plate 231, and the outer surface of the lower side plate part 274, and the external spring piece 5 covers at least part of the joint 230 and the joint 240. In the preferred embodiment, the external spring piece 5 comprises a body piece 51 and an arc-shaped elastic extension piece 52 extending from the edge of the body piece 51 along the insertion direction of the mating optical module plug 200, and the body piece 51 is fixedly connected to the outer surface of the upper side plate part 264, the outer surface of the first extension plate 231, and the outer surface of the lower side plate part 274.

[0048] Please refer to Figures 6 to 12 As shown in the drawings, a plurality of through holes 2621 are formed in the upper connecting plate 262 along the front-rear direction. A plurality of through holes 2721 are formed in the lower connecting plate 272 along the front-rear direction. The through holes 2621 and the through holes 2721 can facilitate the circulation of internal and external air and improve heat dissipation. Further, a protrusion 211 is formed on the top plate 21 at a position close to the front end, and the upper fixing plate 263 is fixedly connected to the outer surface of the top plate 21 at the front end position and is stopped at the protrusion 211. In the preferred embodiment, the upper fixing plate 263 and the outer surface of the top plate 21 at the front end position are fixedly connected by welding.

[0049] Preferably, the shielding cage 2 further comprises an upper heat dissipation module 3 assembled on the top plate 21. Preferably, the top plate 21 is formed with a clearance hole 301 penetrating in the up-down direction, and the lower surface of the upper heat dissipation module 3 is correspondingly formed with a contact boss 301 downwardly protruding into the docking cavity through the clearance hole 210. The contact boss 301 is used to contact the optical module plug 200 inserted into the docking cavity to achieve heat transfer. In one embodiment, the upper heat dissipation module 3 is straddled by an elastic locking member 6, the two ends of the elastic locking member 6 are correspondingly buckled and fixed to the outer surfaces of the left side plate 23 and the right side plate 24, and finally the upper heat dissipation module 3 is movably fixed to the top plate 21. When the optical module plug 200 is inserted into the docking cavity, the upper heat dissipation module 3 can be pushed upward to ensure that the contact boss 301 of the upper heat dissipation module 3 can stably contact the optical module plug 200.

[0050] Further, the front end edge of the upper heat dissipation module 3 is further formed with a limiting portion 31. The limiting portion 31 is formed above the upper fixed plate 263 and is used to limit the upper fixed plate 263 downwardly. In addition, the upper heat dissipation module 3 is upwardly protruded and formed with a plurality of arrayed grating columns 32. A plurality of the grating columns 32 are arranged into a plurality of rows in the front-rear direction. In the left-right direction perpendicular to the front-rear direction, an air flow channel 30 is formed between adjacent two rows of the grating columns 32. The through hole 2621 formed on the upper connecting plate 262 of the upper cover plate 26 is correspondingly communicated with the air flow channel 30 in the front-rear direction to improve the air flow and enhance the heat dissipation performance.

[0051] Please refer to Figure 5 , Figure 6 , Figures 9 to 11 It is shown that the bottom plate 22 is formed with a cantilever-shaped elastic arm 221 near the front end, the elastic arm 221 is formed with a processing gap 2210 on both sides, and the elastic arm 221 comprises an inclined portion into the docking cavity. The lower cover plate 27 is formed with a clearance opening 270 corresponding to the elastic arm 221, and the clearance opening 270 is used to allow the elastic arm 221 to elastically deform. The clearance opening 270 comprises a portion formed on the lower fixed plate 273 and a portion extendedly formed on the lower connecting plate 272. The clearance opening 270 disconnects the lower fixed plate 273 into two independent parts in the left-right direction. The clearance opening 270 does not disconnect the lower connecting plate 272 into two parts. Such design is easy to process, and the overall structural strength of the lower cover plate 27 can be guaranteed at a better level. The elastic arm 221 can elastically push upward the optical module plug 200 inserted into the docking cavity, so as to achieve a certain docking locking function. In addition, the optical module plug 200 can also maintain an upward movement trend, further ensuring the stable contact between the optical module plug 200 and the upper heat dissipation module 3.

[0052] Please refer to Figure 4 As shown in the drawings, the electrical connector assembly 100 in the design of the present application is designed to form a mating interface 10 inclined in the front-back direction, so that the operation pull rod 201 of the optical module plug 200 inserted into the mating cavity can be partially exposed, and when the optical module plug 200 needs to be pulled out, the user can more conveniently grab the operation pull rod 201. Through the design scheme of the present application, the heat dissipation effect can also be improved. It is possible to arrange multiple electrical connector assemblies 100 side by side in a dense manner. In addition, the optical module plug 200 corresponding to the mating interface can also be inclined, which can improve the space utilization rate outside the equipment box 4.

[0053] Although the embodiments of the present application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An electrical connector assembly, characterized in that, include: Terminal module (1) has an insulating body (11) and a plurality of terminal pieces (12) fixed to the insulating body (11). The shielding cage (2) has a top plate (21), a bottom plate (22) disposed opposite to the top plate (21) in the vertical direction, a left side plate (23) connecting one side of the top plate (21) and the bottom plate (22), a right side plate (24) connecting the other side of the top plate (21) and the bottom plate (22) and disposed opposite to the left side plate (23), and a rear end plate (25) joined to the rear end edge of the left side plate (23) and the right side plate (24). The top plate (21), bottom plate (22), left side plate (23), right side plate (24) and rear end plate (25) together form a docking cavity and form an opening at the front end. An installation port (202) is formed between the rear end edge of the bottom plate (22) or the rear end edge of the top plate (21) and the rear end plate (25). The terminal module (1) is assembled in the shielding cage (2) through the installation port (202). The first extension plate (231) is formed by further extending forward from the front edge of the left side plate (23); The second extension plate (241) is formed by further extending forward from the front edge of the right side plate (24); The upper cover plate (26) includes an upper plate body (261), an upper connecting plate (262) extending downward from the rear end edge of the upper plate body (261), an upper fixing plate (263) extending rearward from the rear end edge of the upper connecting plate (262), and two upper side plate portions (264) disposed on both sides of the upper cover plate (26) and extending downward. The lower edges of the two upper side plate portions (264) are respectively fixedly connected to the upper edge of the first extension plate (231) and the upper edge of the second extension plate (241). The upper fixing plate (263) is fixedly connected to the front end of the top plate (21). The lower cover plate (27) has its two sides fixedly connected to the lower edge of the first extension plate (231) and the lower edge of the second extension plate (241), respectively, and the rear end of the lower cover plate (27) is fixedly connected to the front end of the bottom plate (22). The front edge of the upper plate (261), the front edge of the upper side plate (264), the front edge of the first extension plate (231), the front edge of the second extension plate (241), and the front edge of the lower cover plate (27) are combined to form a mating interface (10), and the plane where the mating interface (10) is located is inclined in the front-back direction.

2. The electrical connector assembly as claimed in claim 1, characterized in that: The lower edge of the upper side plate (264) is fixed to the upper edge of the first extension plate (231) by a dovetail groove structure to form a joint seam (230); it also includes an external spring piece (5), which is attached to the outer surface of the upper side plate (264) and the outer surface of the first extension plate (231), and the external spring piece (5) covers at least part of the joint seam (230).

3. The electrical connector assembly as claimed in claim 1, characterized in that: The lower cover plate (27) includes a lower plate body (271), a lower connecting plate (272) extending upward from the rear end edge of the lower plate body (271), a lower fixing plate (273) extending backward from the rear end edge of the lower connecting plate (272), and two lower side plate portions (274) disposed on both sides of the lower plate body (271) and extending upward. The lower edges of the two lower side plate portions (274) are respectively fixedly connected to the upper edge of the first extension plate (231) and the upper edge of the second extension plate (241). The lower fixing plate (273) is fixedly connected to the front end of the bottom plate (22).

4. The electrical connector assembly as claimed in claim 1, characterized in that: The upper connecting plate (262) has several through holes (2621) extending along the front-back direction.

5. The electrical connector assembly as claimed in claim 1, characterized in that: The top plate (21) has a protrusion (211) that protrudes upward near the front end. The upper fixing plate (263) is attached to the outer surface of the front end of the top plate (21) and stops at the protrusion (211) at the rear.

6. The electrical connector assembly as claimed in claim 3, characterized in that: A cantilevered elastic arm (221) is formed on the base plate (22) near the front end. Processing gaps (2210) are formed on both sides of the elastic arm (221). The elastic arm (221) includes a portion that is inclined into the docking cavity. A clearance opening (270) is formed on the lower cover plate (27) and corresponds to the elastic arm (221). The clearance opening (270) is used to allow for the elastic deformation of the elastic arm (221).

7. The electrical connector assembly as claimed in claim 6, characterized in that: The clearance opening (270) includes a portion formed on the lower fixing plate (273) and a portion extending on the lower connecting plate (272), the clearance opening (270) splitting the lower fixing plate (273) into two parts in the left-right direction.

8. The electrical connector assembly as claimed in any one of claims 1 to 7, characterized in that, Also includes: The upper heat dissipation module (3) is assembled on the top plate (21). A limiting part (31) is formed on the front edge of the upper heat dissipation module (3). The limiting part (31) is formed above the upper fixing plate (263).

9. The electrical connector assembly as claimed in claim 8, characterized in that, The upper heat dissipation module (3) extends in the front-back direction and forms a plurality of air channels (30) arranged in the left-right direction. The through hole (2621) formed on the upper connecting plate (262) of the upper cover plate (26) is connected to the air channel (30) in the front-back direction.

10. A communication device comprising a plurality of electrical connector assemblies as described in any one of claims 1 to 9, characterized in that: It also includes a device housing (4), and a plurality of electrical connector assemblies are arranged in a first direction inside the device housing (4). The mating interface (10) of each electrical connector assembly passes through an end face (41) of the device housing (4) and is exposed outward. The plane where the mating interface (10) is located is parallel or flush with the plane where the end face (41) is located.

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