GB2585718A

GB2585718A - Improved wall plug

Info

Publication number: GB2585718A
Application number: GB1913425.3A
Authority: GB
Inventors: Roman Karpicz Grzegorz
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-07-14
Filing date: 2019-09-17
Publication date: 2021-01-20
Anticipated expiration: 2039-09-17
Also published as: GB2585718B; GB201910083D0; GB201913425D0

Abstract

A wall plug containing a capsule containing adhesive that ruptures when a screw 60 engages the wall plug, fusing the wall plug to the hole/opening of a masonry wall or plasterboard for example. The plug’s elongated body has a first portion 20 having an aperture for receiving a screw that forms a extended channel along the longitudinal axis of the portion; the channel extends into a second portion 30 increasing laterally to form a void for the capsule wherein the sides of the void do not abutt the screw; and a third portion 40 receives said screw and terminates the void. Preferably the void extends through the lateral portions of the plug to provide one or more apertures allowing the glue to pass through; wherein pillars between the apertures deflect when the screw engages with the third portion pulling it towards the first portion thereby buckling the outer walls of the second portion. The third portion may have a channel for engaging with the screw, and/or an external collar (44, fig 8), or may be an end void to retain adhesive. The plug body may have a laminar structure, made from cellulosic material; and a rectangular lateral cross section.

Description

Improved wall plug The present invention relates to an improved wall plug for more securely securing a screw into a wall or similar structure.

Wall plugs are used for securing fixings, such as screws into a structure, for example a wall of a building. The plugs provide means for mechanically secure a screw into a usually dissimilar substrate such as a plasterboard or masonry structure, for example a wall. A vast array of wall plugs are available to adapt to various fixings and substrates. Particular issues arise in situations where the substrate is friable, such as plaster/ plasterboard or where improved force distribution is required, such as for high strength fixings. Wall plugs are usually inserted into an aperture created in a substrate and so breach the integrity of the substrate both mechanically and thermally.

An alternative to a wall plug is to use an adhesive and various specialist adhesives are known, such as those injected into apertures in substrate before a screw or bolt is then inserted for the adhesive to set and secure the fixing. Such fixing can be strong but the adhesive takes some time to set.

There is a need for improved and alternative means for securing fixings in substrates, particularly screws into plasterboard. There is also a need to provide environmentally acceptable solutions to securing fixings which retain the environmental credentials of traditional wall plug materials, such as wood or fibre but which also provide the improved mechanical characteristics of modern devices. There is also a need to provide fixing means that do not reduce or may even improve the mechanical and thermal properties of the substrate when used to secure a fixing.

The present invention in its various aspects is as set out in the appended claims. The present invention provides: A wall plug for securing a fixing into a substrate, the plug having an elongate body and, along its length, comprises three sequential portions, the portions being: a. a first portion having a front face with an aperture, the aperture extending to a channel having a principle axis along the length for receiving a screw fixing, the channel being surrounded by the first, fixing entry, portion; the first portion extending to a; b. a second portion in which the channel increases in size laterally to provide a void for holding a capsule and being large enough for not abutting a screw fixing extending through the channel of the first portion into the void; the second portion extending into; c. a third portion for again receiving the fixing and terminating the void.

Preferably the wall plug has the void of the body occupied by a capsule in which an adhesive is located, the capsule being located in the void such that a screw fixing on being advanced along the channel from the front face will penetrate the capsule. Alternatively, the screw fixing, may take other forms, such as having a blunt end in which case the capsule may rupture under pressure rather than being penetrated as, in use, a screw fixing inserted into the wall plug body is advanced along that body. The adhesive capsule provides a reservoir of adhesive to be released upon use of the wall plug so as to, on setting, further secure the plug. So that the plug is initially securable using the screw fixing and the first portion but is subsequently better secured by the adhesive and the second portion. The third portion may also play either role depending upon the depth of the aperture in which the wall plug is used. The released adhesive may also act to thermally insulate the substrate. For this a foaming adhesive such as a polyurethane is preferred.

The adhesive may be selected from a polyurethane, epoxy, poly vinyl acetate and poly vinyl alcohol. The capsule may comprise two compartments each containing an adhesive component, such as those of an epoxy. The screw fixing, in use and having a rotating motion acts to mix the components to provide a setting adhesive mix in situ. This provides adhesives which have a longer shelf life whilst setting quickly once mixed.

Preferably the void extends through the whole of a lateral portion of the second portion to provide one or more apertures. These apertures provide means for adhesive to extruded between the screw the body and any substrate in which the wall plug is to be secured for better securing the wall plug.

Preferably such apertures are interspersed by pillars of equal dimension and are radially equidistant from the longitudinal axis of the channel. This means that if the first and third portions of the wall plug body are brought together then the pillars will distort equally and since wall plugs are usually secured in symmetrical apertures, this will help to more securely and centrally retain the wall plug.

Preferably the pillars are bowed outward so as to deflect radially from the channel upon the first and third portion being compressed together, this being advantageous particular when the wall plug is used with a substrate of a thickness which would not encompass the second portion, as the pillars can bow outward to secure on a rear face of such a substrate to better retain the wall plug, particularly when intermixed with the adhesive.

A foaming adhesive is particularly beneficial with insulated substrates such as insulated plasterboard, which incorporates a layer of insulating foam to the rear side. The adhesive thus repairs the thermal breach made in providing the aperture to secure the wall plug.

Preferably the third portion continues the channel and does so having a lateral dimension similar to that of the channel in the first portion. This acts as guide for a screw fixing advancing along the channel to better centre the fixing and reduces the chances of splatting of the third portion as a screw fixing enters it. The channel is preferably continued through the third portion. The channel is preferably, at least in a portion, of smaller lateral/radial dimension to that in the first portion so as to more strongly grip a screw fixing penetrating the channel.

Preferably the front face extends laterally at the front face to form a lip for restricting entry of the wall plug when inserted into an aperture in a substrate of similar lateral dimensions to that of the first portion. This prevents the wall plug body entering an aperture too far, such as entering an aperture in and being lost behind a plasterboard panel. The length of the first portion may be provided to correspond to a common thickness of substrate, such as plasterboard. For example, of 9.5 or 12.5mm thickness.

The plug body may be made from a material having a laminar structure having the laminates parallel with a principle axis of channel and at least some laminates extending the length of the wall plug.

The third portion may be secured circumferentially by an external collar. This prevents splitting of the third portion when a screw fixing enters this portion. Splitting reduced grip of the screw on the fastener and so greatly reduced wall plug effectiveness. The collar may be a metal or plastics ring or wrap of wire or chord. This is particularly beneficial with a laminar plug body which has more defined planes along which to split.

The plug body may be made of a cellulosic material. This is more environmentally acceptable than most plastics. The laminated cellulosic material may be card, such as thick (0.2 to 2mm) paper. The laminates may be bound by a PVA adhesive. The preferred adhesive for cellulosic plug bodies is PVA as adhesive to adhesive and adhesive to body adhesion is at its strongest between such materials.

The plug body may be rectangular in lateral cross section and any lateral extension of the void does not extend through all of the laminates on at least two opposing sides of the void. This provides both economy of production when made from laminates as well as stopping wall plug rotation in an aperture. It is also helpful when providing a lateral aperture in the body parallel to the laminates.

The channel may be substantially circular in lateral cross section. This simplifies centring of a screw fixing in the body. However, an ovoid or ellipsoidal lateral/radial cross section can be particularly helpful provided the longest axis coincides with a channel across the void, this enhances lateral pillar deformation away from the void for securing in thinner substrates (see figure 13).

The wall plug of the present invention may further comprise a screw fixing located in at least a portion of the channel of the first portion with its head outside the channel, the shaft of the screw fixing preferably being longer than the first and second portions. This enables the screw fixing to penetrate and subsequently retract the third portion toward the first. The screw fixing may be longer, such as equivalent to the length of the whole body, which typically provides sufficient shaft length to secure an object intended to be fixed by the fixing to the substrate.

The screw fixing may have a pointed tip for guiding it along the channel, piercing the capsule and if required penetrating into the third portion The channel in the first portion may be dimensioned to engage the screw thread but not the wall of the void.

Whilst it is preferable that the screw fixing secure in the third portion, the third portion may be of limited length sufficient to form an end to the void so as to retain the adhesive rather than any contracting or securing function in its own right.

The screw fixing may be threaded throughout its length. This assists in the first portion securing in the substrate as it rotates whilst not advancing longitudinally and this pushes the plug body outward to better secure to the substrate, such as while the third portion contracts toward the first.

The screw may be threaded only along a portion remote from its head and the distance from the head to the screw portion is at least as long as the first portion of the plug. This requires less force to be applied to the screw fixing and hence the third portion and capsule are more easily penetrated. Hence it is only relevant where the screw fixing is longer than the first and second portions.

Detailed Description

The present invention in its various aspects will now be described in relation to the following figures which provide: figure 1, a lateral view of a wall plug of the present invention showing internal features; figure 2 a lateral view of a wall plug of the present invention showing further internal features; figure 3 a lateral view of a wall plug of the present invention with lateral apertures; figure 4 the wall plug of figure 3 having a collar on an end portion; figures, a lateral view of a wall plug of the present invention comprising an adhesive capsule; figure 6, a lateral view of figure 5 further comprising a screw fixing in a first position; figure 7, a lateral view of figures further comprising a screw fixing in a second position penetrating the adhesive capsule; figure 8, a lateral view of a laminated wall plug of the present invention showing adhesive capsule and retaining ring; figure 9, a lateral view of a fibrous wall plug of the present invention showing adhesive capsule and end cap; figure 10, a cross-section of a wall plug of the present invention inserted into an aperture of a substrate; figure 11, the cross-section of figure 10 showing the screw fixing advanced through the body of the plug; figure 12, a cross-section of a wall plug of the present invention inserted through an aperture in a substrate; figure 13, the cross-section of figure 12 showing the screw fixing advanced through the body of the plug and having collapsed the second portion of the plug releasing an intermediate link with adhesive from the adhesive capsule; figure 14, provides a perspective view of a wall plug of the present invention; and figure 15, provides a further perspective view of a wall plug of the present invention.

The present invention will now be further described in further detail with reference to the figures, in which like numerals relate to like features: figure 1 provides a lateral view of a wall plug 10 of the present invention showing internal features. The plug having three portions along its length, a first portion 20, having a front face 22, the first portion 20 extending into a second portion 30 having a void 32 before extending further into third portion 40 before the end face 42 of the plug. The first portion 20 has a channel 24 for receiving a screw fixing, the channel preferably being cylindrical. The front face 22 may be extended laterally to provide a lip 26 (not shown, see figure 10) for restricting entry of the wall plug 10 into an aperture formed in a substrate of lateral dimensions of the first portion, beyond that first portion 20.

The wall plug 10 of the present invention has a lateral cross-section, typically circular but optionally and preferably in some embodiments rectangular or octagonal, this lateral cross-section being perpendicular to the elongate axis of the wall plug. If the wall plug 10 were cylindrical then the elongate axis would be the axis of the cylinder. The external lateral dimensions of the wall plug are preferably constant, for example being cylindrical having an optional lip and optional bevel at the end face (to help guide the plug into an aperture). The lateral dimension, if the wall plug 10 were cylindrical could also be termed a radial dimension.

The void 32 provides a greater lateral dimension to this portion of the channel 24. In a further embodiment of the present invention the void 32 may have similar lateral dimensions to that of the channel 24 in the first portion 20 but differs from the first portion in that it is configured to retain an adhesive capsule 50. Such embodiments may further comprise other features described in this document. The void 32 shown in figure 1 is cylindrical and extends from the cylindrical first portion of the channel 24.

For ease of depiction the plug shown in figures 1, 2, 5,6 and 7 is shown in lateral view in which features at the level of a central plain of the plug are shown as a dashed line. Thus, the body of April 10 as a cylinder is shown laterally and the dashed line represents, such as in figure 1 the cross-section of a cylindrical entry channel 24 and cylindrical void 32 all having the same longitudinal axis.

Figure 2 provides a lateral view of a wall plug 10 of the present invention showing further internal features. These features show a variation on the void 32' in which the void is elliptical (or optionally ovoid) in cross-section which assists in self-centring any adhesive capsule 50 placed in the void 32'. This figure also shows an elongation of the channel into the third portion 40 to form a third channel portion 48, for readily locating and engaging a screw fixing 60 into that portion. This is beneficial as the likelihood of the third portion 40 splitting as the screw pierces it is therefore reduced, it also, in centring the screw in the third channel portion 48, this provides a more uniform force distribution on the wall plug as the screw enters the third portion 40 such as to more firmly secure the wall plug in any substrate or to more evenly distort the second portion should the second portion be compressed between the first and third portions (see below).

Figure 3 provides a lateral view of a wall plug of the present invention with lateral apertures 34. This view shows a wall plug 10 such as of figure 1 of figure 2 in which the void 32 has been extended laterally through the walls of the second portion so as to provide a slot 36 through the plug. The slot 36 being bounded by pillars 38, 38' between the first and third portions and having two lateral apertures 34. Such a lateral aperture or apertures enable an adhesive capsule SO to be inserted into the void 36. As will be noted, the present invention does not necessitate the use of an adhesive capsule 50 in all embodiments as it is possible that adhesive can be either injected into the void 32 via channel 24 or laterally through an aperture 34, such as to fill the slot 38. The present invention therefore provides a method of securing a wall plug including applying adhesive in such manner.

Figure 4 provides the wall plug of figure 3 having a collar 44 on an end portion. As, in use, a screw fixing is intended to penetrate the third portion 40 of the plug the plug body 10 may split apart, particularly if the plug is of lamina construction and thus it is advantageous to apply a collar 44 around the third portion 40. This can also act as a point which binds particularly strongly to any screw fixing 60 entering inside the collar 44 as the material of the third portion 40 will be restrained against the screw 60 and therefore the screw can more readily compress the third portion 40 against the first portion 20 in the manner described below.

Figure 5, provides a lateral view of a wall plug 10 comprising an adhesive capsule 50 inside the plug body 12. Most preferably the present invention comprises an adhesive capsule 50, the adhesive capsule 50 being a capsule 52 holding an adhesive. The capsule 52 here is made of aluminium and comprises a polyurethane water curable adhesive. Upon penetration in the capsule 52 by the point 64 of a screw fixing 60 as it advances by rotation along the channel 24 into the enlarged channel void 32 the polyurethane adhesive will react with water in the atmosphere, release gas and expand thus more effectively disputing the adhesive within the void 32. Since in normal use wall plugs have a screw fixing inserted into them up to a required depth in a single action the adhesive will subsequently set after the screw fixing is inserted and therefore security in place. Lateral apertures 34, such as apertures of the slot 36, are particularly beneficial as this allows the adhesive to distribute between the body 12 of the plug and the aperture the plug is placed within.

Figure 6, provides a lateral view of figure 5 further comprising a screw fixing 60 in the first portion 20. The wall plug of the present invention is either for use as a body 10 into which a screw fixing 60 may be inserted into the channel in the first portion or it may be supplied as an assembly comprising the screw fixing 60 pre-inserted into the body 10 along with an adhesive capsule 50. This is preferable as it ensures that the correct dimension screw is presented to the body of the wall plug 10. The screw fixing 60 is preferably positioned so as to occupy the whole of the channel 24 of the first portion 20 of the wall plug 10 and the screw thread is preferably sufficient to engage the walls of the channel 24 so as to advance the screw along the channel as the screw is rotated, such as by means of engaging and rotating a bit into screw head 62 in the conventional manner.

Figure 7, provides a lateral view of figures further comprising a screw fixing 60 in a second position penetrating the adhesive capsule SO. As the screw is rotated, such as clockwise in the conventional manner, the screw will advance along the channel 24 into the void 32 and thereby engage with adhesive present in void 32 (and variations thereof such as 32'). The adhesive is preferably present in a capsule 52. The advantage of a capsule is that some degree of compression of the capsule will occur and as the screw enters the capsule it will more forcibly eject the adhesive then if the adhesive is simply present in the void without being constrained in the envelope of the capsule. This enables more extensive distribution of adhesive, which can be further enhanced if the adhesive is foaming, such as a suitable polyurethane adhesive.

Figure 8, provides a lateral view of a laminated wall plug body 12 with adhesive capsule 50 and retaining ring 44'. This plug has a laminated construction, the laminates extending along the elongate axis of the plug causing the plug to delaminate as he screw enters thus forcing the body against a substrate in which the wall plug 10 is desired to be retained and providing channels through which the adhesive 54 may penetrate along with providing a structure for pillars 38' so that they will more readily deviate laterally (which can be advantageous in some applications (see figure 12 and 13)). The retaining ring 44' may consist of a metal collar or thread. The laminates here are a laminate of paper or cardboard layers. This form of plug is particularly effective with an expanding adhesive, such as a polyurethane as this fills the delamination and also secures the laminations lateral to their main faces.

Figure 9, provides a lateral view of a fibrous wall plug body showing adhesive capsule 50 and end cap 46. The body 12 of the wall plug 10 may comprise an orientated fibrous material, in this example an elongate cuboid of MDF, chipboard may also be used. With such materials; upon the screw fixing 60 penetrating the third portion 40 and drawing the third portion 40 towards the first portion 20 as the head of the screw 62 becomes restrained (such as by abutting the substrate, the front face 22 or an object being affixed to the substrate) the fibrous material will collapse providing a large surface area between which the adhesive may penetrate and so for a compact plug to fill any void in which the wall plug has been inserted and thus provide particularly strong retention. This is made more effective by providing an end cap 46, such as a metal and which effectively creates a piston to compress the body of the plug 12 between the end cap 46 and the screw head 62 or whatever the screw head itself pushes against as the screw is rotated to security in the wall plug, such as when the wall plug is placed in the aperture in a substrate. End cap 46 pay be a metal body with an aperture along the elongate axis of the channel for receiving the screw fixing so as to provide a strong connection with the screw and hence create the 'piston' effect.

Figure 10, provides a cross-section 100 of a wall plug 10 of the present invention inserted into an aperture 202 of a substrate 200.4 wall plug is a means to secure a fixing, here a screw fixing, into an aperture 202 in a substrate 200. Such apertures are conventionally created by drilling into the substrate 200 to provide a cylindrical aperture 202. Hence, the overall elongate dimensions of the wall plug body of the present invention are cylindrical. However, the wall plug may comprise a lip 26 so as to prevent the wall plug 10 entering too far into any aperture 202.

The present invention provides a method of use of the wall plugs described herein, in which an aperture is created in a substrate 200, the wall plug is inserted into the aperture 202 as far as a lip 26 and a screw fixing 60 is inserted into the channel 24 of the wall plug 10, advancing through the body of the plug when rotated.

Figure 11, the cross-section of figure 10 showing the screw fixing 60 advanced through the body of the plug. The screw fixing 60 is shown at full length (the length of the plug body 10 or longer), whereas in previous figures a shortened version is shown for ease of depiction. The effect of the screw rotating is shown by means of various arrows. In the first region 20 the screw expands the plug body 10 in the conventional way, but upon the screw head becoming restrained (by whatever object is being secured to the substrate 200 by the screw fixing) the channel is dimensioned to be chewed up by the thread and hence forced out laterally to bind to the wall of the aperture. In contrast the third portion of the channel 48 either formed in situ as here or pre-formed 48 (see figure 2) binds to the screw fixing and thus is continually pulled toward the first portion 70, this compressing the second portion between the first and third portion so as to urge the adhesive 54 outward to better seal the plug body 10 in the aperture 202.

Figure 12, a cross-section of a wall plug 100 of the present invention inserted through an aperture 202' in a substrate. This figure illustrates the benefit of the wall plug of the present invention when used for securing an object 204 of a substrate 200' which is of limited depth, such as plasterboard. Here the fixing is inserted into the aperture 202' up to the depth of the first portion 20 and the screw fixing 60 rotated so as to advance the screw 60 through the wall plug body 10. In contrast to the operation shown in figures 10 and 11 were the aperture is of significant depth, here (see figure 13) when the screw head 62 is restrained, against an object 204, and whilst the first portion 20 then expands outwards (see small arrow) to accommodate the continually rotating screw thread the third channel portion 48 in the third portion 40 is drawn by the screw thread 64 towards the first portion 20 and thus the thinner cross-section of the second portion 30, giving it less strength, causes it to collapse thereby distributing the adhesive 54 in punctured capsule 52 of the adhesive capsule 50 more widely and thus securing the wall plug against the rear face to 10 of the substrate 200'. This is beneficial over known fixings which expand behind a substrate as such fixings can often rotate or otherwise be disturbed was in the present instance the radially/laterally expanded portion 380 is bonded with adhesive. As previously and expanding adhesive is preferred as this will fill a larger volume.

Figure 14, provides a perspective view of a wall plug body of the present invention in a different form having equivalent features to those previously described; and Figure 15, provides a further perspective view of a wall plug of the present invention. In this embodiment protrusions 26 are provided on the outer wall of the first portion 20 so as to grip and aperture 202, 202' into which the wall plug body is placed. The protrusions 26 are serrated so as to provide a leading bevel to protrusions 26 and trailing radio phase 262 so as to provide a wedge shape for better insertion and ended extraction into an aperture 202, 202'. Also shown is channel 24, which is intrinsically present in the other examples but which is more clearly illustrated here. This shows how the channel, when extended into the void 32, provides a trough 37 between the apertures 34 of the slot 36 and thus provides a means for mechanically securing an adhesive capsule 50, particularly in adhesive capsule 50 having a curved outer wall (i.e. curved perpendicular to its longitudinal axis) in the void 50. This is particularly so if the capsule 50 has a, preferred, external radius equivalent to that of the internal radius of the void 50 The wall plug body 10 illustrated here can be combined as above with a screw fixing 60 and adhesive capsule 50 as previously described.

Claims

Claims, 1. A wall plug (10) for securing a fixing into a substrate (200), the plug having an elongate body and, along its length, comprises three sequential portions, the portions being: a. a first portion (20) having a front face (22) with an aperture, the aperture extending to a channel (24) having a principle axis along the length for receiving a screw fixing (60), the channel (24) being surrounded by the first, fixing entry, portion; the first portion (20) extending to a; b. a second portion (30) in which the channel (24) increases in size laterally to provide a void (32) for holding an adhesive capsule (50) and being large enough not to abut the screw fixing (60) extending through the channel (24) of the first portion (20) into the void (32); the second portion (30) extending into; c. a third portion (40) for again receiving the screw fixing (60) and terminating the void (32).
2. The wall plug (10) of claim 1 in which the void (32) of the body is occupied by the adhesive capsule (50) in which an adhesive is located, the adhesive capsule (SO) being located in the void (32) such that a screw fixing (60) on being advanced along the channel (24) from the front face (22) penetrates the adhesive capsule (50).
3. The wall plug (10) of claim 1 or claim 2 wherein the void (32) extends through the whole of lateral portion of the second portion (30) to provide one or more apertures (34).
4. The wall plug (10) of claim 3 wherein the apertures (34) are interspersed by pillars (38, 38') of equal dimension and are radially equidistant from the longitudinal axis of the channel (24).
S. The wall plug (10) of claim 4 wherein the pillars (38, 38') are bowed outward so as to deflect radially from the channel (24) upon the first and third portion being compressed together.
6. The wall plug (10) of any preceding claim wherein the third portion (40) continues the channel (48) and does so having a lateral dimension similar to that of the channel (24) in the first portion (20).
7. The wall plug (10) of any preceding claim wherein the front face (22) extends laterally at the front face to form a lip (26) for restricting entry of the wall plug (10) when inserted into a hole in a substrate (200) of similar lateral dimensions to that of the first portion (20).
8. The wall plug (10) of any preceding claim wherein the plug is made from a material having a laminar structure having the laminates parallel with a principle axis of the channel (24) and at least some laminates extending the length of the wall plug (10).
9. The wall plug (10) of any preceding claim wherein the portion is secured circumferentially by an external collar (44).
10. The wall plug (10) of any preceding claim wherein the plug is made of a cellulosic material.
11. The wall plug (10) of claim 10 wherein the laminated cellulosic material is card.
12. The wall plug (10) of claim 11 wherein the plug is rectangular in lateral cross section and the lateral extension of the void (32) of claim 3 does not extend through all of the laminates on at least two opposing sides of the void (32).
13. The wall plug (10) of any preceding claim wherein the channel is substantially circular in lateral cross section.
14. The wall plug (10) of any preceding claim wherein the plug further comprises said screw fixing (60) located in at least a portion of the channel (24) of the first portion (20) with its head outside the channel, the shaft of the screw fixing (60) being longer than the first and second portions.
15. The wall plug (10) of claim 14 wherein the screw fixing (60) has a pointed tip (64) for guiding it along the channel (24), piercing the adhesive capsule (50) and if required penetrating into the third portion (40).
16. The wall plug (10) of claim 14 or claim 15 wherein the channel (24) in the first portion (20) is dimensioned to engage the screw thread but not the wall of the void (32).
17. The wall plug (10) of any of claims 14 to 16 wherein the screw is threaded throughout its length.
18. The wall plug (10) of any of claims 14 to 16 wherein the screw is threaded only along a portion remote from its heads and the distance from the head to the screw portion is at least as long as the first portion (20) of the plug (10).
19. The wall plug (10) of any proceeding claim wherein the body (12) of the plug comprises protrusions (26) on the outer wall of the first portion (20).A kit of parts comprising: the wall plug (10) of any proceeding claim, a screw fixing (60) of suitable lateral dimensions to be inserted into the aperture of the wall plug (10), and an adhesive capsule (50) containing an adhesive which are for placing within the void (32) of the second portion (30) of the wall plug (10).
20. The kit of parts of claim 19 further comprising: a plurality of said wall plugs (10), a plurality of corresponding screw fixings (60), and a plurality of adhesive capsules (50), wherein the wall plugs and screw fixings have a variety of lengths along their elongate axis.
21. A method of using a wall plug (10) of any proceeding claim, wherein an aperture is made within a substrate (200); the wall plug (10) having suitable dimensions is inserted into the aperture within the substrate (200), wherein the aperture has the corresponding lateral dimensions as the wall plug (10), a screw fixing (60) is then inserted into the channel (24) through the aperture in the front face (22) of the wall plug (10), wherein the screw fixing (60) will advance through the body of the wall plug (10) when rotated in the appropriate, such as clockwise, direction.
22. The method of claim 21, wherein the point (64) of the screw fixing (60) is advanced by rotating the screw fixing (60) to penetrate the adhesive capsule (50).