Connector sealing uncovering structure and bent hole connector

Abstract

The utility model relates to a connector sealing uncovering structure and a bending type opening connector, the connector sealing uncovering structure comprises an insulation cap used for plugging an opening at one side of a connector housing, and the periphery of the insulation cap is sleeved with a sealing rubber ring used for realizing radial sealing between the insulation cap and the opening. The tail end of the insulating cap and the cover plate are detachably connected or integrally designed, and the insulating cap is detachably fixed on the connector shell through the cover plate. According to the utility model, the insulation cap and the sealing rubber ring are preassembled, the insulation cap and the cover plate are detachably connected, and the insulation cap, the sealing rubber ring and the cover plate are fixed on the connector shell after being connected into a whole, so that the assembly and disassembly are convenient, the movement of the insulation cap can be avoided, and the sealing performance of the connector is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of connectors, and in particular relates to a connector sealing cover opening structure and a bent opening connector. Background Art

[0002] With the development of new energy vehicles, the application of connectors has reached a new level, and the product structure has become more diverse. The connector's cover opening structure enables customers to easily open the casing and install and remove cables, thereby improving the convenience of use. At present, the connector's cover opening structure mostly adopts axial sealing, and uses a cover plate to compress the sealing rubber ring. The existing connector cover opening structure is mainly a top cover, which is fastened with multiple screws, and the sealing rubber ring is installed around the opening. This cover opening structure is relatively complicated, and a large number of screws are used. When removing and installing, the screws need to be removed one by one, which affects the assembly efficiency and increases the overall cost of the connector. In addition, the larger opening requires more screws to fasten the top cover, and increases the risk of sealing failure. Summary of the invention

[0003] The utility model provides a new type of connector sealing cover structure and a curved opening connector, which can meet the design requirements of small-size openings, and the cover structure can be connected as a whole through pre-assembly to achieve integrated assembly and removal, thereby achieving rapid and reliable sealing of the opening and meeting the connection requirements between contact pieces extending in different directions in the curved connector.

[0004] The purpose of the utility model and the technical problem to be solved are achieved by adopting the following technical solutions. According to a connector sealing cover structure proposed by the utility model, it includes an insulating cap for sealing a side opening of a connector housing, a sealing rubber ring for radially sealing the insulating cap is sleeved on the outer periphery of the insulating cap, and the rear end of the insulating cap is integrally arranged with or detachably connected to a cover plate, and the cover plate is detachably fixed to the connector housing.

[0005] The purpose of the utility model and the solution to its technical problems can also be further achieved by adopting the following technical measures.

[0006] In the aforementioned connector sealed cover opening structure, the cover plate is fixed to the connector housing by a fastening screw, and the threaded hole on the connector housing adapted to the fastening screw is a blind hole.

[0007] In the aforementioned connector sealed cover opening structure, the cover plate is also anti-rotationally matched with the connector housing via a positioning column.

[0008] In the aforementioned connector sealed cover opening structure, the positioning post is fixed on the connector housing, and the cover plate is provided with a first positioning hole adapted to the positioning post.

[0009] In the aforementioned connector sealed cover opening structure, the insulating cap realizes a detachable connection between the insulating cap and the cover plate through the cooperation of the buckle structure at the rear of the insulating cap and the slot on the cover plate.

[0010] The aforementioned connector sealed cover opening structure, the snap structure includes two cantilevers arranged at intervals and a hook located at the end of the two cantilevers on one side away from the other cantilever, the cover plate is provided with a through hole for the two cantilevers to pass through, and the hook is clamped on the edge of the through hole.

[0011] In the aforementioned connector sealed opening cover structure, an annular groove is formed at one end of the through hole away from the insulating cap, and the hook of the cantilever is located in the annular groove and is engaged and adapted with the bottom of the annular groove.

[0012] In the aforementioned connector sealing cover opening structure, the surface of the two cantilevers close to the other cantilever is an inclined surface, so that the distance between the two cantilevers gradually increases from the root to the end with the hook.

[0013] The aforementioned connector sealed cover opening structure, the surface of the hook used to latch on the cover is a horizontal stop surface flush with the surface of the cover, the horizontal stop surface is connected to the end of the cantilever through a guiding slope, and the guiding slope can bring the two cantilevers closer to each other when the cantilever passes through the through hole on the cover from the inside to the outside.

[0014] The aforementioned connector sealed cover opening structure, the cover plate is fixed on the positioning boss on the connector.

[0015] The aforementioned connector sealed open cover structure, the insulating cap has a cavity with an open front end, and the cavity can accommodate the head of an external fastener used to realize internal wiring of the connector.

[0016] The purpose of the utility model and the solution of its technical problems are also achieved by the following technical solutions. According to a curved opening connector proposed by the utility model, it includes an outer shell, the outer shell has a first installation area extending along a first direction and a second installation area extending along a second direction, characterized in that: an opening is provided on one side of the intersection of the first installation area and the second installation area, and an external fastener inserted into the outer shell through the opening realizes the connection of a group of contacts in the first installation area and the second installation area; an opening structure fixed on the outer shell realizes the sealing of the opening, and the opening structure is the above-mentioned opening structure.

[0017] The purpose of the utility model and the solution to its technical problems can also be further achieved by adopting the following technical measures.

[0018] In the aforementioned bent open hole connector, the external fastener is a bolt.

[0019] In the aforementioned bent open-hole connector, the outer shell and the cover plate are both metal structures, a first insulating shell for fixing the first contact piece is also provided in the first installation area, and a second insulating shell for fixing the second contact piece is also provided in the second installation area, and a notch for the front end of the second contact piece to enter is provided on the side of the first insulating shell facing the second insulating shell, and a notch for the external fastener to enter is provided on the side facing the opening.

[0020] In the aforementioned bent open hole connector, the second insulating shell is fixed in the outer shell by means of a cantilever snap-fit ​​structure at its front end and a snap-fit ​​fit with a stepped surface in the outer shell.

[0021] In the aforementioned bent open hole connector, two groups of contacts are installed in the first installation area and the second installation area, and an opening is provided on both sides of the outer shell to facilitate the connection operation of the side contact, and each opening corresponds to a group of cover structures.

[0022] Compared with the prior art, the utility model has obvious advantages and beneficial effects. By means of the above technical solution, the utility model can achieve considerable technical progress and practicality, and has wide industrial utilization value, and has at least the following advantages:

[0023] The cover opening structure of the utility model is arranged on the side of the connector, and the arrangement of the structure can be realized in a relatively small space, thereby ensuring the installation and disassembly of the internal parts of the connector.

[0024] The cover plate of the utility model has a small overall size and a simple structure, can be processed by sheet metal stamping, saves mold costs, can be adapted to small-sized openings, and ensures the installation and removal of the internal parts of the connector.

[0025] The utility model discloses an open cover structure, the insulating cap and the sealing rubber ring are pre-assembled, and the insulating cap is detachably connected to the cover plate. The three are connected as one and fixed on the connector housing, which is not only convenient for installation and removal, but also can prevent the insulating cap from moving, thereby ensuring the sealing performance of the connector.

[0026] The utility model curved connector adopts a small-sized side opening so that the connector wire can be installed and removed, and a rubber ring is used to ensure the sealing of the side opening position, and the quick blocking and opening of the opening is achieved through the pre-assembled opening cover structure.

[0027] The cover plate of the utility model is positioned and fixed on the outer shell by means of positioning columns and screws, thus reducing the number of screws used to fasten the hole cover plate and reducing the risk of hole sealing failure.

[0028] The connector of the utility model adopts bolts to fasten the copper bar, the wire and its accessories, thus ensuring the stability and reliability of the connection.

[0029] The second insulating housing of the connector of the utility model is fixedly connected to the outer housing by means of a buckle, the overall structure is more centralized, installation and disassembly are convenient, and assembly efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the curved opening connector of the utility model;

[0031] Figure 2 for Figure 1 A partial enlarged view of

[0032] Figure 3 This is an exploded view of the curved opening connector of the utility model;

[0033] Figure 4 It is a cross-sectional view of the curved opening connector of the utility model;

[0034] Figure 5 for Figure 4 A partial enlarged view of

[0035] Figure 6 for Figure 4 Another enlarged view of a part of;

[0036] Figure 7 Another cross-sectional view of the curved opening connector of the utility model;

[0037] Figure 8 for Figure 7 A partial enlarged view of .

[0038]

Main component symbol description

[0039] 1: Outer shell

[0040] 101: First installation area

[0041] 102: Second installation area

[0042] 103: Step surface

[0043] 2: First insulation shell

[0044] 3: The first copper bar

[0045] 4: Wire

[0046] 5: Inner shielding ring

[0047] 6: Outer shielding ring

[0048] 7: Sealing body assembly

[0049] 8: Cable clamp

[0050] 9: Tail cover

[0051] 10: Second insulation shell

[0052] 11: The second copper bar

[0053] 12: Sealing ring

[0054] 14: Opening

[0055] 15: Bolt

[0056] 16: Nut

[0057] 17: Insulation cap

[0058] 171: Buckle structure

[0059] 18: Sealing rubber ring

[0060] 19: Cover

[0061] 191: First positioning hole

[0062] 192: Second positioning hole

[0063] 193: threaded hole

[0064] 194: Through hole

[0065] 195: Ring groove

[0066] 20: Fastening screw

[0067] 21: Positioning column

[0068] 22: Positioning boss

[0069] 23: Cantilever snap-on structure

[0070] 24: Equipment copper busbar DETAILED DESCRIPTION

[0071] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the curved opening connector proposed by the present invention in combination with the accompanying drawings and preferred embodiments.

[0072] See also Figure 1-8 , which is a schematic diagram of the structure of each part of the curved open hole connector of the utility model. The curved open hole connector includes an outer shell 1, and the outer shell 1 includes a first installation area 101 extending along a first direction and a second installation area 102 extending along a second direction. There is an angle between the first direction and the second direction, so that the outer shell 1 is a curved structure as a whole.

[0073] The first mounting area 101 contains a first contact extending along a first direction, and the second mounting area 102 contains a second contact extending along a second direction, wherein the first contact and the second contact are connected and fixed at the junction of the first mounting area 101 and the second mounting area 102 by external fasteners.

[0074] An opening 14 is provided on one side of the outer shell 1 at the junction of the first installation area and the second installation area. The external fastener enters the outer shell 1 through the opening 14 and connects and fixes the first contact piece and the second contact piece.

[0075] The outer shell 1 seals the opening 14 through a detachable and fixed opening structure thereon. The opening structure includes a cover plate 19, an insulating cap 17 and a sealing rubber ring 18, wherein the insulating cap 17 is located in the opening 14 and is used to seal the opening 14, and the sealing rubber ring 18 is sleeved on the outer circumference of the insulating cap 17 to achieve radial sealing between the insulating cap 17 and the opening 14. The cover plate 19 is positioned on the outer shell 1 by a positioning column 21 and is fixed on the outer shell 1 by a fastening screw 20. The cover plate 19 can also seal the insulating cap 17 to prevent it from falling out of the opening 14. In this embodiment, at least one convex rib is provided along the axial direction on the outer circumference of the sealing rubber ring 18 to enhance the seal between the insulating cap 17 and the inner wall of the opening 14.

[0076] In this embodiment, the positioning column 21 is fixed on the outer shell 1, and the cover plate 19 is provided with a first positioning hole 191 adapted to the positioning column 21 and a second positioning hole 192 adapted to the fastening screw 20. When the cover plate 19 covers the opening of the opening 14, the positioning column 21 located on one side of the opening 14 passes through the first positioning hole 191, and the fastening screw 20 passes through the second positioning hole 192 and is pressed and fixed to the outer shell 1 by matching and locking with the threaded hole 193 on the outer shell 1, and the threaded hole 193 is a blind hole. In other embodiments of the utility model, the positioning column 21 is fixed on the cover plate 19, and the first positioning hole 191 is located on the outer shell 1.

[0077] In the embodiment of the utility model, the outer shell 1 is protruded outward around the opening 14 to form a positioning boss 22, and the positioning column 21 and the threaded hole 193 are both located on the positioning boss 22. The setting of the positioning boss 22 can meet the requirement of setting the threaded hole 193 as a blind hole without increasing the overall thickness of the outer shell 1. Preferably, the contour of the positioning boss 22 is consistent with that of the cover plate 19, so that the cover plate 19 just covers the positioning boss 22, but it is not limited to this.

[0078] In this embodiment, the insulating cap 17 has a cavity with an open front end for accommodating the head of an external fastener, so that the open cover structure occupies a smaller space in the outer shell 1, meeting the requirements of miniaturization.

[0079] In this embodiment, the tail of the insulating cap 17 is detachably connected to the cover plate 19, so that the two can be preassembled together, thereby realizing the integrated installation and removal of the two. In this embodiment, a buckle structure 171 extending backward along its axial direction is also provided on the end surface of the tail of the insulating cap 17, and the buckle structure 171 can be snap-fitted with the card slot on the cover plate 19 to achieve the fixation of the insulating cap 17 on the cover plate 1, so that the installation and removal of the insulating cap 17 can be realized by installing and removing the cover plate 19. In other embodiments of the utility model, the insulating cap 17 and the cover plate 19 are an integrated structure, such as the two can be integrally injection molded.

[0080] In this embodiment, the buckle structure 171 is composed of two cantilevers with hooks at the ends, the two cantilevers are spaced apart and the hooks are located on the side of the cantilever away from the other cantilever. The cover plate 19 is provided with a through hole 194 for the two cantilevers constituting the buckle structure 171 to pass through, and the cantilever passes through the through hole 194 and is hooked on the cover plate 19 by the hooks at its ends to achieve a reliable connection with the cover plate 19. Preferably, an annular groove 195 is formed at one end of the through hole 194 away from the insulating cap 17, and the hook of the cantilever is located in the annular groove 195 and is engaged with the bottom of the annular groove, but is not limited thereto.

[0081] In this embodiment, the surfaces of the two cantilevers constituting the buckle structure 171 close to the other cantilever are inclined, so that the distance between the two cantilevers gradually increases from the root to the end with the hook, so as to enhance the hooking ability of the hook.

[0082] In this embodiment, in order to facilitate the buckle connection between the insulating cap 17 and the cover plate 19, the hook on the cantilever includes a horizontal stop surface for being stuck on the cover plate 19 and a guiding inclined surface for guiding and cooperating with the through hole 194. The guiding inclined surface can guide and cooperate with the inner wall of the through hole when the cantilever passes through the through hole 194 and make the two cantilevers approach each other so as to quickly pass through the through hole 194. Specifically, the diameter of the circumference of the end of the guiding inclined surface on the two cantilever hooks away from the horizontal stop surface is smaller than the inner diameter of the through hole 194, while the diameter of the circumference of the end connected with the horizontal stop surface is larger than the through hole 194. When the insulating cap 194 and the cover plate 1 are assembled, the ends of the two cantilevers enter the through hole 194, and the end of the hook guiding inclined surface away from the horizontal stop surface enters the through hole. As the thickness of the hook increases, the through hole squeezes the guiding inclined surface, so that the cantilever swings inward. When the hook passes through the through hole 194, the cantilever returns to its original state and no longer bears radial extrusion force.

[0083] In other embodiments of the present invention, the positioning column 21 is fixed on the cover plate 19, and the first positioning hole is a blind hole located on the outer shell.

[0084] In other embodiments of the present invention, the cover plate 19 may also be detachably fixed to the outer shell 1 in other ways, such as a snap connection.

[0085] In the embodiment of the utility model, the outer shell 1 is a metal shell, and the cover plate 19 is a metal cover plate made by sheet metal stamping or other low-cost processing methods.

[0086] When the cover opening structure is used, the cover plate 19, the sealing rubber ring 18 and the insulating cap 17 are first assembled together, and then the assembled components are installed on the outer shell 1 and locked with the fastening screws 20. Since the cover plate 19 cooperates with the outer shell 1 through the fastening screws 20 and the positioning column 21, the cover plate 19 can be effectively fixed on the outer shell to prevent rotation. Since the insulating cap 17 is connected to the cover plate by buckle, it can also effectively prevent the insulating cap from moving in the opening.

[0087] In other embodiments of the utility model, the cover plate 19 and the insulating cap 17 can be detachably fixed by other means, such as bolt connection, threaded connection, etc., to meet the pre-assembly requirements of the open cover structure, so that when the open cover structure needs to be assembled and opened, the pre-assembled insulating cap, cover plate, and sealing rubber ring can be removed together, and when removing, the removed pre-assembled structure can also be hung on the positioning column, which can effectively solve the problem of difficult placement of parts during removal and unloading.

[0088] In the embodiment of the utility model, the external fastener includes a bolt 15 and a nut 16, and the bolt 15 and the nut 16 connect the first contact piece and the second contact piece together. Preferably, in the embodiment, the bolt is an M6 hexagonal bolt and the nut is an M6 hexagonal nut, but it is not limited thereto. In other embodiments of the utility model, the external fastener may also be other structures that can realize the connection between the first contact piece and the second contact piece.

[0089] In this embodiment, the first contact member includes a first copper bar 3 at the front end and a wire 4 at the rear end, wherein the first copper bar 3 is welded and fixed to the front end of the wire 4. A hole matching the bolt 15 is provided at the front end of the first copper bar 3, and the second contact member is a second copper bar 11, and a hole matching the bolt 15 is provided at the front end of the second copper bar 11. When the first copper bar 3 and the second copper bar 11 are both assembled in the outer shell 1, the holes at the front ends of the first copper bar 3 and the second copper bar 11 are opposite to each other, and both are opposite to the opening 14, so that the two can be fixed together by the bolt 15 and the nut 16 inserted through the opening.

[0090] The first installation area 101 is also provided with a first insulating housing 2, the first copper bar 3 and the front end of the wire 4 are located in the first insulating housing 2, an inner shielding ring 5 is provided between the first insulating housing 2 and the wire 4 to shield the wire 4 after the outer sheath is stripped, the tail of the first insulating housing 2 is connected to the outer sheath of the wire 4 through an outer shielding ring 6, and the outer shielding ring 6 is in contact with the outer housing 1 through its outer peripheral claws. The wire 4 and the outer housing 1 are also sealed by a sealing body assembly 7, and a tail cover 9 is provided at the tail of the outer housing 1, and the tail cover 9 is pressed against the wire 4 through a wire clamp 8.

[0091] In this embodiment, a notch is provided on the side of the first insulating housing 2 facing the second installation area for the front end of the second copper bar to enter, and a notch is provided on the side facing the opening for the external fastener to enter.

[0092] A second insulating shell 10 is also installed in the second installation area 102, and the second copper busbar 11 is located in the second insulating shell 10, and cantilever hook structures 23 are formed on both sides of the front end of the second insulating shell 10. The hooks on the cantilever hook structures 23 can be engaged with the stepped surface 103 on the outer shell 1 to achieve fixed positioning of the second insulating shell 10 in the outer shell 1.

[0093] In this embodiment, the tail of the second copper bar 11 extends out of the second insulating housing 10 for direct connection with the equipment end. Preferably, a ring 24 is formed on the outer periphery of the tail of the second insulating housing 10, the outer ring of which extends axially forward and presses the sealing ring 12 against the stop surface on the outer periphery of the outer housing 1 to prevent it from detaching from the outer housing 1, thereby limiting the axial position of the sealing rubber ring 12 and ensuring reliable sealing between the curved connector and the equipment end.

[0094] In an embodiment of the utility model, the connector is a single-core connector, and the opening 14 is located on one side of the connector outer shell. In other embodiments of the utility model, the connector is a dual-core connector, and openings 14 are provided on both sides of the connector outer shell. The connection and fixation of the internal contacts on either side are achieved through the openings 14 on that side, and each opening 14 corresponds to a set of opening cover structures.

[0095] In other embodiments of the present invention, the openings may also be located on other sides of the outer shell 1 shown in the figure, and different opening positions may be selected according to the distribution of the butted copper busbars.

[0096] When assembling the connector of the utility model, firstly, the insulator, the copper bar, the wire and other components are installed into the shell, and then the second copper bar and the first copper bar at the front end of the wire are fixed at the side hole by bolts, and finally the cover plate at the opening is tightened by fastening screws.

[0097] In other embodiments of the present invention, the cover opening structure can be applied to any connector having an opening that needs to be sealed, and is not limited to the curved connector in the embodiments of the present invention.

[0098] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A connector sealing cover opening structure, characterized in that: It includes an insulating cap for sealing a side opening of a connector housing, a sealing rubber ring is sleeved on the outer periphery of the insulating cap for achieving radial sealing with the opening, the rear end of the insulating cap is integrally arranged with or detachably connected to a cover plate, and the cover plate is detachably fixed to the connector housing.

2. The connector sealing and opening cover structure according to claim 1, characterized in that: The cover plate is fixed on the connector housing by a fastening screw, and the threaded hole on the connector housing adapted to the fastening screw is a blind hole.

3. The connector sealing and opening structure according to claim 2, characterized in that: The cover plate is also anti-rotationally matched with the connector housing via a positioning column.

4. The connector sealing cover opening structure according to claim 3, characterized in that: The positioning post is fixed on the connector housing, and the cover plate is provided with a first positioning hole matched with the positioning post.

5. The connector sealing cover opening structure according to claim 1, characterized in that: The buckle structure at the rear of the insulating cap cooperates with the clamping groove on the cover plate to achieve a detachable connection between the two.

6. The connector sealing cover opening structure according to claim 5, characterized in that: The buckle structure includes two cantilevers arranged at intervals and a hook located at the end of the two cantilevers on one side away from the other cantilever. The cover plate is provided with a through hole for the two cantilevers to pass through, and the hook is clamped on the edge of the through hole.

7. The connector sealing and opening cover structure according to claim 6, characterized in that: An annular groove is formed at one end of the through hole away from the insulating cap, and the hook of the cantilever is located in the annular groove and is engaged and adapted with the bottom of the annular groove.

8. The connector sealing and opening cover structure according to claim 7, characterized in that: The surfaces of the two cantilevers close to the other cantilever are inclined surfaces, so that the distance between the two cantilevers gradually increases from the root to the end portion where the hook is provided.

9. The connector sealing cover opening structure according to claim 8, characterized in that: The surface of the hook used to clamp on the cover plate is a horizontal stop surface flush with the surface of the cover plate. The horizontal stop surface is connected to the end of the cantilever through a guiding slope. The guiding slope can bring the two cantilevers closer to each other when the cantilever passes through the through hole on the cover plate from inside to outside.

10. The connector sealing and opening structure according to any one of claims 1 to 9, characterized in that: The cover plate is fixed on the positioning boss on the connector.

11. The connector sealing and opening cover structure according to claim 10, characterized in that: The insulating cap has a cavity with an open front end, and the cavity can accommodate the head of an external fastener used for realizing internal wiring of the connector.

12. A curved opening connector, comprising an outer shell, the outer shell having a first mounting area extending along a first direction and a second mounting area extending along a second direction, characterized in that: An opening is provided on one side of the intersection of the first installation area and the second installation area, and an external fastener installed in the outer shell is inserted into the opening to realize the connection between a group of contact parts in the first installation area and the second installation area; an opening cover structure fixed on the outer shell realizes the sealing of the opening, and the opening cover structure is the opening cover structure described in any one of claims 1-11.

13. The curved opening connector according to claim 12, characterized in that: The external fastener is a bolt.

14. The curved opening connector according to claim 12 or 13, characterized in that: The outer shell and the cover plate are both metal structures. A first insulating shell for fixing the first contact piece is also provided in the first installation area, and a second insulating shell for fixing the second contact piece is also provided in the second installation area. A notch for the front end of the second contact piece to enter is provided on the side of the first insulating shell facing the second insulating shell, and a notch for the external fastener to enter is provided on the side facing the opening.

15. The curved opening connector according to claim 14, characterized in that: The second insulating shell is fixed in the outer shell by means of a cantilever buckle structure at its front end and a snap fit with a stepped surface in the outer shell.

16. The curved opening connector according to claim 15, characterized in that: Two groups of contacts are installed in the first installation area and the second installation area. An opening is provided on both sides of the outer shell to facilitate the connection operation of the side contact, and each opening corresponds to a group of cover structures.

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