GB2603767A

GB2603767A - A cover location system for a modular in-ground chamber

Info

Publication number: GB2603767A
Application number: GB2101876.7A
Authority: GB
Inventors: Clements Claire; William Brooker Steven
Original assignee: Northstone NI Ltd
Current assignee: Northstone NI Ltd
Priority date: 2021-02-11
Filing date: 2021-02-11
Publication date: 2022-08-17
Also published as: GB202101876D0; WO2022172002A1; EP4291727A1

Abstract

A cover location system for an in-ground chamber 11 with at least one sidewall defining an internal volume and having an uppermost edge with at least one first formation 19 located on/in the uppermost edge 13, and a cover or cover frame 10 having at least one second formation corresponding to the at least one first formation 17 to secure the cover or cover frame relative to the in-ground chamber against at least lateral movement.

Description

A COVER LOCATION SYSTEM FOR A MODULAR IN-GROUND

CHAMBER

Technical Field of the Invention

The present invention relates generally to the field of modular in-ground chambers and covers. In particular, but not exclusively, the invention concerns cover to chamber location and fixing systems.

Background to the Invention

In the formation of an in-ground chamber, a frame 10 for a cover 14 is normally provided to cover the in-ground chamber 11 The frame 10 can either sit directly on 10 top of the chamber 11 or with a compacted mortar bed 30 between the frame 10 and the chamber 11 as shown in Figure 1 In order to enhance adhesion to the bedding mortar, the frame 10 can be provided with one or more grouting bars 40 as shown in Figure 2. The grouting bars simply sit on an upper surface of the sidewall.

Two common applications for a cover with a frame are within the footway and grass verge In the grass verge application, the current frame can often be difficult to accurately locate centrally relative to the chamber as the frame is easily subject to lateral movement above the chamber. Vertical movement can also be found if the mortar haunching is not applied correctly or appropriately around the frame to encapsulate the grouting bars.

Embodiments of the invention seek to at least partially overcome or ameliorate any one or more of the abovementioned disadvantages or provide the consumer with a useful or commercial choice.

Summary of the Invention

According to a first aspect of the invention there is provided a cover location system for an in-ground chamber, the system comprising: an in-ground chamber with at least one sidewall defining an internal volume and having an uppermost edge with at least one first formation located on/in the uppermost edge, and a cover or cover frame having at least one second formation corresponding to the at least one first formation to secure the cover relative to the in-ground chamber against at least lateral movement According to a second aspect of the invention, there is provided an inground chamber and cover assembly comprising: an In-ground chamber with at least one sidewall defining an internal volume and having an uppermost edge with at least one first formation located on/in the uppermost edge, a cover frame having at least one second formation corresponding to the at least one first formation to secure the cover frame relative to the in-ground chamber against at least lateral movement, and at least one cover member positioned relative to the cover frame to close the internal volume of the in-ground chamber.

The at least one second formation and the at least one first formation may secure the cover relative to the in-ground chamber against vertical movement.

Providing a cover which secures against at least lateral movement, and typically vertical movement as well, relative to the top face of the in-ground chamber ring allows multilocation/self-location of the cover relative to the top face of the chamber with the option to fix the cover directly to chamber.

The cover of the present invention achieves this by incorporating features into the frame that correspond to features provided on the chamber (for location and fixing) allowing the cover and the chamber to be secured relative to each other against at least lateral movement The cover may be provided as an integrated or one-piece cover. In other words, a unitary cover may be provided with features of the at least one second formation incorporated thereinto or mounted relative thereto. In this embodiment, the unitary cover may not include a perimeter cover frame A unitary cover including features of the at least one second formation incorporated thereinto may be moulded or otherwise formed in a single piece. A unitary cover may have one or more second formations attached directly thereto.

The in-ground chamber may be of any type. The in-ground chamber may be a unitary structure. The in-ground chamber may be a multi-part chamber formed from a number of stackable sections or rings placed one on top of each other. The stackable sections or rings may have features at the top and bottom thereof to enhance the stability of the stacking. Each stackable section or ring may be made of a plurality of components which attached to or relative to one another to form a stackable section or ring.

The cover or cover frame preferably secures against the uppermost edge of the in-ground chamber. The at least one first formation is typically located on/in the uppermost edge of the uppermost stackable section or ring of a multipart chamber.

In an embodiment, the cover frame will typically fit and be secured relative to the chamber and a cover (formed or one or more cover members) will normally fit relative to the cover frame.

Smaller chambers may have a single, unitary cover member and larger chambers may have a cover formed from multiple cover members located relative to 20 the frame.

The cover or cover frame typically fits relative to the topmost ring in a multipart chamber. The cover or cover frame preferably secures against the uppermost edge of the topmost ring in a a multi-part chamber. Fitting (and securing) relative to the uppermost edge of the chamber will preferably allow the internal volume of the chamber to remain unobstructed.

The cover or cover frame may have additional formations that fit within (or outside) the chamber.

The uppermost edge of the chamber may be defined at an upper end of a planar wall. The wall may be solid or hollow. In an embodiment, the wall of the chamber may have a substantially rectangular, hollow cross-section.

The walls of the chamber typically have a laterally extending surface located at an upper side. The uppermost laterally extending surface of the wall may be the uppermost edge relative to which the frame is secured.

The topmost ring in a multi-part chamber may be a rising frame. A rising frame may include one or more downwardly depending flanges or plates located such that when the frame is positioned on the chamber, the one or more downwardly depending flanges or plates are located inside the chamber volume.

The cover frame may be manufactured from a number of elongate members attached together. The cover frame can have any size and any shape, generally corresponding to the size and shape of the chamber relative to which it will fit. The cover frame may be a perimeter frame.

Each frame member will typically have an L-shaped cross-sectional shape. The typical L-shaped cross-sectional shape is normally formed by provision of a pair of planar portions. The cross-sectional shape is normally consistent over the length of the frame members. The frame members are preferably connected or joined together at their respective ends to form a perimeter frame. Any connection method can be used. The ends of the frame members may be square cut but will normally be mitre cut.

The cover or cover frame may be provided with one or more grouting formations provided to enhance the engagement of the frame with a mortar bed surrounding an upper portion of the chamber, if provided. The one or more grouting formation may be the at least one second formation.

The grouting formations may take the form of grouting bars. The grouting bars may have any shape. The grouting bars may have any configuration. Any number of grouting bars may be provided.

Typically, grouting formations will extend outwardly from the cover or cover frame in order to better engage the mortar bed.

Grouting formations are preferably provided at at least one corner of the cover or cover frame. Preferably, a grouting formation is provided at all of the corners of the corners of the cover or cover frame.

In an embodiment, a grouting bar may be provided in a generally V-shaped or U-shaped configuration. In this form, the grouting bar will normally be a single length of bar, typically metal. The bar is usually bent to the desired shape. One end of the grouting bar is normally fixed to a cover or cover frame member on one side of the cover or cover frame and the other end of the grouting bar is normally fixed to a cover or cover frame member on a second side of the cover or cover frame. The grouting bar will then straddle a corner of the cover or cover frame.

The grouting bar may have any cross-sectional shape.

The at least one second formation is typically provided relative to an underside 10 of the cover or cover frame. The at least one second formation may extend from an underside of the frame (if provided as an extension) or into/through the underside of the cover or cover frame (if provided as an opening).

The at least one second formation may have any form provided that it corresponds to the at least one first formation to secure the cover or cover frame relative to the in-ground chamber.

The at least one second formation may be provided as an extension, such as a tab, pin, post, plate or similar provided on the cover or cover frame and configured to be received in an opening or depression provided on the uppermost edge of the in-ground chamber. One or more side edges of the opening or depression provided on the uppermost edge of the in-ground chamber may limit the movement of the at least one second formation.

The at least one second formation may extend from the cover or cover frame in any direction. The at least one second formation may extend laterally from the cover or cover frame, preferably to an external side of the cover or cover frame. The at least 25 one second formation may extend downwardly from the cover or cover frame.

The at least one second formation may be provided as an opening or depression, provided on the cover or cover frame and configured to receive in an extension provided on the uppermost edge of the in-ground chamber or a third component such as a pin for example, if the at least one first formation is an opening or depression provided on the uppermost edge of the in-ground chamber and the third component secures the cover or cover frame relative to the chamber.

Providing one or more extensions on the chamber is less preferred than providing one or more extensions on the cover or cover frame as the at least one second formation.

Where the at least one first formation is provided as an opening or depression, the opening or depression may be provided into or through the uppermost edge of the chamber. The opening or depression will preferably be sized and shaped to receive the at least one second formation. The opening or depression may be sized and shaped to receive the at least one second formation closely, so as to substantially prevent any lateral movement, or alternatively, clearance may be provided (by providing an opening or depression which is larger than the at least one second formation) so allow some lateral movement but to limit the movement.

Some example forms of the at least one second formation include the grouting bar described above, a plate, or a pin which are receivable into the at least one first formation provided as an opening or depression into or through the uppermost edge of the chamber.

The at least one second formation may be provided as a plate. More than one plate may be provided spaced about the cover or cover frame. The plate may extend laterally, typically outwardly from the cover or cover frame. The plate is typically mounted relative to an underside of the cover or cover frame. The plate may have any shape but a rectangular shape is preferred. A plate may be dimensioned such that when it extends laterally from the cover or cover frame, it does not extend outside the chamber. The plate may include an opening therethrough to allow the plate to be fixed relative to the in-ground chamber, either to the chamber, or to a part of the surrounds of the in-ground chamber.

There are circumstances in which the at least one second formation which does extend outside the chamber may be useful, such as for example, to engage with a mortar bed.

The plate will typically be received within a corresponding opening or depression provided into or through the uppermost edge of the chamber.

The at least one second formation may be provided as a pin. More than one pin may be provided spaced about the cover or cover frame. The pin may extend laterally, typically outwardly from the cover or cover frame. The pin may extend downwardly.

The pin may extend vertically. The pin is typically mounted relative to an underside of the frame and extend therefrom. The pin will typically be received within a corresponding opening or depression provided into or through the uppermost edge of the chamber.

The reverse of these configuration may be provided with the plate or pin provided on the chamber and the opening or depression provided on the cover or cover frame.

The at least one second formation may be provided as an opening with a corresponding opening provided into or through the uppermost edge of the chamber, such that when the respective openings are aligned, a third component such as a pin can be inserted.

If a pin is provided, the pin will normally have features to secure the cover or cover frame relative to the chamber and/or surrounding ground. The pin may have an enlarged head and an elongate shank. The shank may be at least partially threaded to engage a nut or similar, or to be driven into the ground. The head may have an engagement portion to engage a tool to drive the pin into the engaged condition.

The cover or cover frame is typically smaller than the external dimension of the chamber relative to which it is mounted. The internal dimension of the cover or cover frame will preferably substantially match the internal dimension of the chamber, at least at an upper portion.

As mentioned above, the cover or cover frame typically does not extend laterally beyond the extremities of the chamber. In some circumstances, the at least one second formation may extend laterally beyond the extremities of the chamber.

The underside of the cover or cover frame is typically directly supported, preferably about the perimeter of the cover or cover frame, by at least one upper surface of the chamber (apart from the openings or depressions where these are provided as the at least one first formation) One or more seals or sealing arrangements may be provided between the cover and chamber, any one or more cover members and the cover frame and/or the cover 5 frame and the chamber.

Detailed Description of the Invention

In order that the invention may be more clearly understood one or more embodiments thereof will now be described, by way of example only, with reference to the accompanying drawings, of which: Figure 1 is a sectional view of a prior art modular, in-ground chamber with a cover.

Figure 2 is an isometric view of an uppermost stackable section of a prior art modular, in-ground chamber with a cover frame including grouting bars.

Figure 3 is an isometric view of a cover frame including grouting bars with side skirt portions in an embodiment.

Figure 4 is an isometric view of a corner portion of a cover frame including grouting bars relative to an uppermost stackable section of a prior art modular, in-ground chamber in an embodiment.

Figure 5A is an isometric exploded view of a chamber and frame according to an embodiment.

Figure 5B is an isometric exploded view of a chamber and frame according to a further embodiment.

Figure 5C is an isometric exploded view of a chamber and frame according to another embodiment.

Figure 5D is an isometric exploded view of a chamber and frame according to still another embodiment.

Figure 6A is an isometric view of a chamber and frame as illustrated in Figure 5A, Figure 6B is an isometric view of a chamber and frame as illustrated in Figure 5B.

Figure 6C is an isometric view of a chamber and frame as illustrated in Figure SC.

Figure 6D is an isometric view of a chamber and frame as illustrated in Figure 5D, Figure 7 is an enlarged view of the configuration illustrated in Figure 5A.

Figure 8 is an enlarged view of the configuration illustrated in Figure 5B.

Figure 9 is an enlarged view of the configuration illustrated in Figure SC.

Figure 10 is an enlarged view of the configuration illustrated in Figure SD With reference to accompanying figures 3 to 10, a cover frame location system for an in-ground chamber is illustrated. The system comprises an in-ground chamber 11 with at least one sidewall defining an internal volume and having an uppermost edge with at least one first formation located on/in the uppermost edge. In the accompanying Figures 3 to 10, only an upper portion of the chamber 11 is illustrated and this upper portion may be an upper stackable section or ring or simply an upper part of a unitary chamber.

The system also comprises a cover frame 10 haying at least one second formation corresponding to the at least one first formation to secure the cover frame 10 relative to the in-ground chamber against at least lateral movement.

Various possible configurations of both the upper portion of the inground chamber 11 and the cover frame 10 are illustrated in Figures SA to 6D and in more detail in Figures 3, 4, and 7 to 10 As illustrated in these Figures, the cover frame 10 incorporates features that correspond to features of the chamber 11 (for location and fixing) allowing the cover frame 10 and the chamber 11 to be secured relative to each other against at least lateral 20 movement.

The in-ground chamber 11 may be of any type. The in-ground chamber may be a unitary structure. The in-ground chamber may be a multi-part chamber formed from a number of stackable sections or rings placed one on top of each other. The stackable sections or rings may have features at the top and bottom thereof to enhance the stability of the stacking. An example of these features is shown in Figure 1.

Although not illustrated, each stackable section or ring may be made of a plurality of components which attached to or relative to one another to form a stackable section or ring.

The cover frame 10 will typically fit and be secured relative to the chamber 11 as shown in Figures 6A to GD for example, and a cover (formed or one or more cover members) will normally fit relative to the cover frame 10. Smaller chambers may have a single, unitary cover member and larger chambers may have a cover formed from multiple cover members located relative to the frame.

As shown in Figures 6A to 6D for example, the cover frame 10 typically fits relative to the topmost ring in a multi-part chamber. The cover frame 10 preferably secures against the uppermost edge of the topmost ring in a multi-part chamber. Fitting (and securing) relative to the uppermost edge of the chamber will preferably allow the internal volume of the chamber to remain unobstructed as shown in Figures 6A to 6D The cover frame 10 may incorporate features which would normally be a part of a rising frame. The cover frame 10 may include one or more downwardly depending flanges or plates 12 located such that when the cover frame is positioned on the chamber, the one or more downwardly depending flanges or plates are located inside the chamber volume, as those shown in Figure 3 As illustrated most clearly in Figures 4 and 7 to 10, the walls of the chamber 11 typically have a laterally extending surface located at an upper side, an uppermost edge 13 relative to which the cover frame 1 0 is secured.

The cover frame 10 is normally manufactured from a number of elongate frame 20 members 14 attached together. The cover frame 10 can have any size and any shape, generally corresponding to the size and shape of the chamber 11 relative to which it will fit.

As shown in Figure 4 for example, each frame member 14 will typically have an L-shaped cross-sectional shape. The typical L-shaped cross-sectional shape is normally formed by provision of a pair of planar portions, a horizontal planar portion and a vertical planar portion 16 that are oriented perpendicularly to one another. The cross-sectional shape is normally consistent over the length of the frame members. The frame members will typically be extruded or roll formed to provide this constant cross-section.

The frame members 14 are preferably connected or joined together at their respective ends to form a perimeter frame. Any connection method can be used. The ends of the frame members may be square cut but will normally be mitre cut as shown.

The cover frame 10 may be provided with one or more grouting formations 5 provided to enhance the engagement of the frame with a mortar bed surrounding an upper portion of the chamber, if provided The grouting formations may take the form of grouting bars 17, an example of which is illustrated in Figures 3,4, 7 and 8. In these Figures, the grouting bars 17 are the at least one second formation. The grouting bars 17 may have any shape. The grouting bars may have any configuration. Any number of grouting bars may be provided.

Typically, grouting bars 17 extend outwardly from the cover frame 10 in order to better engage the mortar bed, if provided.

In the embodiments illustrated in Figures 3, 4, 7 and 8, the grouting bars 17 are provided each corner of the cover frame 10.

In an embodiment, each grouting bar 17 is provided in a generally V-shaped or U-shaped configuration. In this form, the grouting bar 17 will normally be a single length of bar, typically metal. The bar 17 is usually bent to the desired shape. One end of the grouting bar 17 is normally fixed to a frame member 14 on one side of the cover frame 10 and the other end of the grouting bar 17 is normally fixed to a frame member 14 on a second side of the cover frame 10 The grouting bar 17 will then straddle a corner of the cover frame 10.

The grouting bar may have any cross-sectional shape.

Regardless of the form provided, the at least one second formation is typically provided relative to an underside of the cover frame 10. The at least one second formation may extend from an underside of the cover frame 10 (if provided as an extension), or into/through the underside of the frame (if provided as an opening), such as that shown in Figures 3 and 10.

The at least one second formation may have any form provided that it corresponds to the at least one first formation to secure the cover frame 10 relative to the in-ground chamber 11.

As shown in Figures 7 to 9, for example, the at least one second formation may be provided as an extension, such as a grouting bar 17 (Figures 7 and 8) or a tab 18 (Figure 9) provided on the cover frame 10 and configured to be received in a corresponding opening or depression 19 provided on the uppermost edge of the in-ground chamber 11.

The at least one second formation may be provided as an opening or depression 20, provided on the cover frame 10 and configured to receive in an extension provided on the uppermost edge of the in-ground chamber 11 or a third component such as a pin for example, if the at least one first formation is a corresponding opening or depression 21 provided on the uppermost edge of the in-ground chamber 11 and the third component, such as a pin 70, secures the frame relative to the chamber 11 Examples of this configuration are shown in Figures 3 and 10 As shown, where the at least one first formation is provided as an opening or depression 19, the opening or depression 19 is provided into or through the uppermost edge 13 of the chamber 11. The opening or depression 19 is preferably be sized and shaped to receive the at least one second formation, whatever the configuration of the at least one second formation. The opening or depression 19 may be sized and shaped to receive the at least one second formation closely, so as to substantially prevent any lateral movement such as that illustrated in Figures 4 and 8 to 10, or alternatively, clearance may be provided (by providing an opening or depression 19 which is larger than the at least one second formation) so allow some lateral movement but to limit the movement such as that illustrated in Figure 7.

The at least one second formation may be provided as a plate or tab 18 such as that illustrated in Figure 9. More than one plate or tab 18 may be provided spaced about the cover frame 10. The plate or tab 18 may extend laterally, typically outwardly from the cover frame 10. As shown in Figure 9, the plate or tab 18 is mounted relative to an underside of the cover frame 10. The plate or tab 18 may have any shape but a rectangular shape is preferred. As shown in Figure 9, the plate or tab 18 may be dimensioned such that when it extends laterally from the cover frame, it does not extend outside the periphery of the chamber 11. There are circumstances in which a plate or tab 18 which does extend outside the chamber may be useful, such as for example, to engage with a mortar bed. The plate or tab 18 will typically be received within a corresponding opening or depression 19 provided into or through the uppermost edge 13 of the chamber 11.

The at least one second formation may be provided as an opening with a corresponding opening provided into or through the uppermost edge of the chamber, such that when the respective openings are aligned, a pin 70 can be inserted. Such a configuration is illustrated in Figure 10 As shown in Figures GA to GD in particular, the cover frame 10 is typically smaller than the external dimension of the chamber 11 relative to which it is mounted. The internal dimension of the cover frame 10 will preferably substantially match the internal dimension of the chamber 11, at least at an upper portion.

As mentioned above, the cover frame 10 typically does not extend laterally beyond the extremities of the chamber 11, although, in some circumstances, the at least one second formation may extend laterally beyond the extremities of the chamber 11.

The underside of the cover frame 10 is typically directly supported, preferably about the perimeter of the cover frame 10, by at least one upper surface 13 of the chamber 11 (apart from the openings or depressions 19 where these are provided as the at least one first formation) The one or more embodiments are described above by way of example only. Many variations are possible without departing from the scope of protection afforded by the appended claims

Claims

CLAIMSA cover location system for an in-ground chamber, the system comprising: a. an in-ground chamber with at least one sidewall defining an internal volume and having an uppermost edge with at least one first formation located on/in the uppermost edge, and b. a cover or cover frame having at least one second formation corresponding to the at least one first formation to secure the cover or cover frame relative to the in-ground chamber against at least lateral movement.
2. A cover location system as claimed in claim 1 further comprising at least one cover member positioned relative to the cover frame to close the internal volume of the in-ground chamber.
A cover location system as claimed in claim 1 or claim 2 wherein the at least one second formation and the at least one first formation secure the cover frame relative to the in-ground chamber against vertical movement.
A cover location system as claimed in any one of the preceding claims wherein the in-ground chamber is a multi-part chamber formed from a number of stackable sections or rings placed one on top of each other.
5. A cover location system as claimed in claim 4 wherein the stackable sections or rings have features at the top and bottom thereof to enhance stability when stacked.
A cover location system as claimed in any one of the preceding claims wherein the cover or cover frame has additional formations that fit within or outside the in-ground chamber.
7. A cover location system as claimed in claim 6 wherein the additional formations include one or more downwardly depending flanges or plates located such that when the cover or cover frame is positioned on the in-ground chamber, the one or more downwardly depending flanges or plates are located inside the chamber volume.
A cover location system as claimed in any one of the preceding claims wherein the cover frame is formed from a number of frame members connected together to form a frame perimeter, each frame member having an L-shaped cross-sectional shape.
9, A cover location system as claimed in claim 8 wherein the L-shaped cross-sectional shape is formed by provision of a pair of planar portions, a first planar portion to abut the uppermost edge and a second planar portion extending at an angle to the first planar portion.
10. A cover location system as claimed in any one of the preceding claims further including one or more grouting formations provided to enhance the engagement of the cover or cover frame with a mortar bed surrounding an upper portion of the chamber, if provided.
11 A cover location system as claimed in claim 10 wherein the one or more grouting formations are the at least one second formation.
12. A cover location system as claimed in claim 10 or claim 11 wherein the one or more grouting formations extend outwardly from the cover or cover frame in order to better engage the mortar bed.
13. A cover location system as claimed in any one of claims 10 to 12 wherein the one or more grouting formations are provided at at least one corner of the cover or cover frame.
14 A cover location system as claimed in any one of the preceding claims wherein the at least one second formation extends from an underside of the cover or cover frame when provided as an extension or into/through the underside of the cover or cover frame when provided as an opening 15. A cover location system as claimed in any one of the preceding claims wherein the at least one second formation is provided as an extension provided on the cover or cover frame and configured to be received in an opening or depression provided on the uppermost edge of the in-ground chamber.16. A cover location system as claimed in any one of the preceding claims wherein the at least one second formation is provided as a plate.17. A cover location system as claimed in any one of claims 1 to 15 wherein the at least one second formation is provided as a pin 18. A cover location system as claimed in any one of claims 1 to 13 wherein the at least one second formation is provided as an opening or depression, provided on the cover or cover frame and configured to receive an extension provided on the uppermost edge of the in-ground chamber.19. A cover location system as claimed in any one of claims Ito 13 wherein the at least one second formation is provided as an opening or depression, provided on the cover or cover frame and the at least one first formation is an opening or depression provided on the uppermost edge of the in-ground chamber and a third component is provided insertable into the respective aligned openings or depressions to secure the cover or cover frame relative to the in-ground chamber.20. A cover frae location system as claimed in any one of the preceding claims wherein the at least one first formation is provided as an opening or depression, the opening or depression is provided into or through the uppermost edge of the chamber.2L A cover location system as claimed in claim 20 wherein the opening or depression is sized and shaped to receive the at least one second formation.22. A cover location system as claimed in claim 20 or claim 21 wherein the opening or depression is sized and shaped to receive the at least one second formation closely, so as to substantially prevent any lateral movement 23. A cover location system as claimed in any one of the preceding claims wherein an underside of the cover or cover frame is directly supported by at least one upper surface of the chamber.24. A cover location system as claimed in any one of the preceding claims wherein the cover or cover frame is smaller than an external dimension of the in-ground chamber relative to which it is mounted.25. A cover location system as claimed in any one of the preceding claims wherein an internal dimension of the cover or cover frame substantially matches an internal dimension of the chamber, at least at an upper portion thereof 26. A cover location system as claimed in any one of claims 10 to 25 when dependent directly from claim 1 wherein the cover is a one-piece cover provided with the at least one second formation. !0