GB2540410A

GB2540410A - Panel clip

Info

Publication number: GB2540410A
Application number: GB1512465.4A
Authority: GB
Inventors: Hancock Tony
Original assignee: G T WINDOWS Ltd
Current assignee: G T WINDOWS Ltd
Priority date: 2015-07-16
Filing date: 2015-07-16
Publication date: 2017-01-18
Anticipated expiration: 2035-07-16
Also published as: GB201512465D0; GB2540410B

Abstract

A clip 20 for resisting the pushing of a panel (30, Fig. 16) out of its sash framing (50, Fig. 16) comprises a base 22 and an obstructer 24. The base is configured for fixing the clip to a border of the panel. The obstructer is angled away from the base and has an end edge (26, Fig. 9). When fixed to the panel in its sash framing, the end edge extends at an acute angle into an air pocket of the sash framing, such that an attempt to push the panel out of its sash framing brings the end edge of the obstructer into engagement with a wall (54, Fig. 16) of the air pocket. The clip may comprise an adhesive area (8, Figure 14), which may be a sticky pad, for fixing it to the panel. The clip may be stamped from sheet metal.

Description

Panel Clip

Field of the Invention

The present invention relates to security devices for doors and windows. More specifically, the present invention relates to a panel clip hindering intrusion via doors or windows.

Background

Glass panels that are held in their sash framing by a bead can be a security concern. Particularly for PVC sash framing, the bead may be removable with only little effort, permitting a panel to be removed from its sash without great difficulty, thereby providing access through the sash without having to prise the sash framing out of the wall frame. In other words, an entry may be provided by removal of a glass panel out of its door or window, while it is closed in its frame.

To mitigate this risk, beads are conventionally located on the inside, i.e., the interiorfacing side of a sash when closed, to deny direct outside access to the window bead. However, using appropriate handheld tools, skilled intruders are able to penetrate a sash framing of a closed frame from the outside at a suitable location of the internal beads, such that the tool penetrates from the outside through the sash framing, permitting the internal beads to be pushed out of their sash framing towards the interior side. It may take less than a couple of minutes to remove the interior beads from the outside. With the interior beads removed, a panel can be pushed out of its sash framing with little force, granting access through the sash framing. GB2403979B, assigned to Applicant of the present specification, discloses a two-component retaining device suitable for being fitted to a door or window sash framing. The first component, a bracket, of the retaining device is mountable to a sash framing and comprises a raised portion to provide a gap between the first component and the sash framing, such that one limb of the second component, a L-shaped retaining clip, can be slid under the raised portion. The L-shaped retaining clip retains a panel in the sash framing. The two components comprise mutually cooperable detent means that resist the prising of a panel out of its sash framing.

The present invention seeks to provide an improved security device.

Summary of the Invention

In accordance with a first aspect of the present invention, there is provided a security clip for resisting the pushing of a panel out of its sash framing as defined in claim 1.

The sash framing is of a type having a circumferentially extending profile providing an air pocket between a border of the panel and the sash framing. The security clip comprises a base and an obstructer. The base is configured for fixing the clip to the panel at the border of the panel. The obstructer has an end edge that extends from the base. The obstructer is angled away from the base such that, when the security clip is fixed to the panel in its sash framing, the end edge of the obstructer extends at an acute angle from the border into the air pocket such that an attempt to push the panel out of its sash framing brings the end edge of the obstructer into engagement with a wall of the air pocket, to resist a pushing of the panel out of its sash framing.

In day-to-day language, and also in the trade, there is sometimes ambiguous use of expressions for components of doors and windows, such as “frame”, “panel”, or “sash”. Conventionally, a frame of a door or window designates the component installed in a wall of a building. Pivotably or slidably disposed in the frame is the sash or leaf of the door or window. Herein, the expression “sash” is understood in its broadest sense and intended to include, e.g., hinged or hung leaves. The sash comprises a sash framing in which a panel (e.g., a glass panel) is set. The present invention concerns a security clip to be installed at the interface between a panel and a sash framing.

The expression “outside” is understood with respect to the orientation when the frame and sash are installed in a building and the sash is closed in the frame. The outside face of a closed, or non-opening, door or window would be accessible to an intruder from the outside.

When referring to panels, the expression “side” may in conventional language be used to designate any surface of a panel. In the case of a double-glazed door or window panel, the panel comprises an inner pane and an outer pane that are held together by an insulating circumferential spacer. In the present specification, the surfaces of the panes are referred to as “inside face” and “outside face”, respectively. The remaining surfaces of the panel, e.g. the surfaces surrounding the inside face and the outside face, are defined herein as “border”. The edge between the border and the inside face is the inside edge, and the edge between the border and the outside face is the outside edge.

To better illustrate this, representative panel and sash framing configurations, as known in the art, are illustrated in Figures 1 to 3.

Figure 1 shows a portion of a panel 30 in cross-section. The panel 30 may be a conventional panel to be inserted into a sash framing. The panel 30 is a double-glazed panel comprising an inner glass pane 32 with an inside face 34 and an outer glass pane 42 with an outside face 44. The inner glass pane 32 and the outer glass pane 42 are thermally insulated by a spacer material 40 that extends along the circumference of the panel 30 and encloses between the two glass panes 32 and 34 and the spacer material 40 a chamber 46 that may contain an insulating gas. The outer surface of the spacer material 40, together with the adjacent surface 33 of the inner glass pane 32 and the adjacent surface 43 of the outer glass pane 43, constitutes a border 38 of the panel 30. An inner edge 36 is defined as the edge between the inner face 34 and the border 38, and can be assumed to have a right angle.

Figure 2 shows a cross-sectional top view of one jamb of an exemplary conventional sash framing 50. The sash framing 50 comprises an extruded profile with a plurality of walls 54, 56, and 58 that extend circumferentially along the sash framing 50 and provide a profile of the sash framing 50. The profile defines an air pocket 52 extending circumferentially around the panel 30 to be provided. The air pocket is also called “air gap” in the trade.

In Figure 3, the panel 30 is fitted into place in the sash framing 50 and provided with packers to be held in place, in accordance with standard glazing instructions. It will be understood that although no packers are shown in the cross-section of Figure 3, packers are provided along the circumference of the sash framing 50, to hold the panel 30 in place in the sash framing 50. After that, an internal bead 60 is applied to cover the air pocket 52.

The present Applicant has discovered that a security clip with an acutely-angled obstructer to resist pushing a panel out of its sash framing is capable of passing the requirements a so-called “spike test”. This is a standardised (BSI) test in which a test person is permitted to attempt, in a simulated burglary attempt, to remove the glass panel of an internally beaded window using standardised equipment (a handheld chisel and their own body weight) to remove internal window beads from the outside and push the glass panel out of the sash framing within a standardised amount of time.

Prototypes of the security clip in accordance with the invention were able to withstand such an attempted intrusion for a considerable length of time, in excess of the requirements of the spike test. In contrast, internally beaded window panels without a security clip may be removed by a skilled burglar in under a minute.

The security clip has no impact on the structural integrity of the sash framing, because it is fixed to the panel only. A panel-mounted security clip does not need to be height-adjusted with packers, because, due to the thickness of the walls of the air pocket of the sash framing, there is some leeway to ensure that the obstructer comes into engagement with a wall of the air pocket. In contrast, when installing a two-component retaining device with a L-shaped retaining clip to the sash framing, packers may be required to adjust the distance between the panel and the retaining clip, to maximise the contact area between the L-shaped limb and the panel.

Furthermore, providing an obstructer to engage with a wall of the sash framing avoids the need to align a plurality of components to ensure their proper mutual cooperation. This facilitates the installation of the security clip.

In an embodiment, the base further comprises an upright portion for aligning the security clip at an edge of the panel.

This helps to align the security clip relative to the panel. A convenient embodiment of the upright portion is a lip or a portion of approximately right angle to the base providing an “L” profile. The upright portion helps to retain the security clip on the panel when an attempt is made to push the panel out of its sash framing.

In an embodiment, the security clip further comprises an adhesive area for affixing the security clip to the panel.

An adhesive area allows the security clip to be fixed to a surface of the panel, which reduces the impact on the structural integrity of the panel, as would otherwise be the case with screws or other fixation means. The adhesive area may be understood as an area facilitating adhesive connection between the security clip and the panel.

In an embodiment, the adhesive area is provided on a panel-facing surface of the upright portion.

It will be understood that, when affixed to the panel, the base of the security clip is on the border of the panel, and the upright portion is aligned with an edge between the border and a surface of the panel. Thus, one surface of the upright portion can be brought into contact with the panel. This facilitates the installation of the security clip into a panel-framing assembly prior to the fitting of an internal bead.

In an embodiment, the security clip is configured for affixing to the panel via the upright portion, thereby allowing the base to bend away from the panel under a load while the security clip remains affixed to the panel.

By providing the adhesive area between the security clip and the panel on the panelfacing surface of the upright portion, the base of the clip is permitted to resiliently bend away from the border during an intrusion attempt. It is believed that permitting the base to bend away further helps to distribute peak forces, because an attempt to push a panel inward causes the security clip to deform and thereby increase the resistive effect of the security clip.

In an embodiment, the adhesive area is provided by an adhesive pad.

Surprisingly, a double-sided sticky pad provides a sufficiently strong fixing means to pass the spike test.

In an embodiment, the adhesive pad is compressible to a thickness of less than 90% of its uncompressed thickness. A compressible adhesive pad, such as, e.g., a foam sticky pad of about 1 mm thickness, allows uneven surface features to be accommodated, to improve the adhesive connection between the security clip and the panel. For instance, the security clip may be provided with reinforcing ribs at an edge formed between the upright portion and the base. Such reinforcing ribs would potentially provide a point contact between the security clip and the panel. By providing a compressible pad, the reinforcing ribs may depress into the pad, whereby a point load directly onto the panel surface is reduced or even completely avoided. In embodiments, the adhesive pad may be compressible to a thickness of less than 80%, 70%, 60%, 50%, or 40% of its uncompressed thickness.

In an embodiment, the acute angle is no more than 45, 40, or 35 degrees, and/or no less than 15, 20, 25, or 30 degrees. A end edge extending from the base at an angle of between 15 to 45 degrees is believed to provide an improved resistive engagement with a wall of the air pocket.

In an embodiment, the base is dimensioned to avoid thermally bridging an inner pane and an outer pane of the panel.

It will be understood in the art that double-glazed panels comprise an outer glass pane and an inner glass pane that are thermally insulated by a non-conducting spacer material and gas. Great care is taken to avoid a thermal bridge between the outer and inner panes. For instance, the sash framing typically comprises a circumferential so-called air gap in which the border of the panel is located. By “dimensioned to avoid thermally bridging the inner surface”, it will be understood in the art that the base of the security clip has a width that is shorter than the panel thickness. When installed on the inner edge of the panel, the base will cover most of the border of the panel, i.e., one glass pane and most of the non-conducting spacer, but the base of the security clip is not in contact at the same time with the outer glass pane and the inner glass pane. By not being so wide as to make contact between the outer and inner glass pane, a base is dimensioned to avoid thermally bridging the inner and outer glass pane.

In an embodiment, the obstructer comprises two arms.

Conveniently, the obstructer is embodied by two or more arms. Two arms may be provided on either side of the upright portion, to flank the upright portion. This allows the contact surfaces of the security clip with the sash framing to be spread, to improve a resistive engagement of the obstructer with a wall of the air pocket.

In an embodiment, the obstructer extends beyond the upright portion.

The upright portion may be utilised as an alignment feature of the security clip with the inner edge of the panel, and so the upright portion can be assumed to lie on the outer face of the panel. By “extending beyond”, it is meant that at least a portion of the obstructer extends further than the upright portion, such that, when the security clip is affixed to an inner edge of a panel, the obstructer extends towards the inside beyond the inner face of the panel. In particular in sash framings with a wide air pocket (or “air gap”), an extended obstructer provides for the resistive engagement to be effected sooner than would otherwise be the case.

In an embodiment, the security clip is stamped from sheet metal.

This facilitates the manufacture of the security clip. This helps to achieve a uniform thickness of the security clip. By using spring steel, the resilient properties of the security clip are increased. In this regard, in embodiments with an adhesive pad, the adhesive pad may be provided as part of a kit comprising a security clip and an adhesive pad to which the security clip may be affixed. Alternatively, the adhesive pad may be affixed to the security clip during manufacture.

In accordance with a second aspect of the present invention, there is provided a door or window sash comprising a sash framing and a panel in its sash framing, wherein the panel comprises a plurality of security clips in accordance with any one of the embodiments of the first aspect.

In an embodiment, the panel comprises at least four of said security clips.

The security clips are provided near the corners of the panel. For instance, one security clip may be affixed at the lower half of the left border, one at the upper half of the left border, and, likewise, one security clip may be affixed at the lower and upper halves of the right border. This helps to distribute the load across the security clips on the panel in the event of an intrusion attempt.

More security clips may be affixed to a panel, as required. For instance, it may be appropriate to use more than four security clips for an elongate patio door panel.

In an embodiment, the security clips are fixed by an adhesive between the panel-facing surface on an upright portion of the security clip and the inside-facing surface of the panel.

Description of the Figures

Exemplary embodiments of the invention will now be described with reference to the Figures, in which:

Figure 1 shows a cross-sectional top view of a portion of a glass panel, as known in the art;

Figure 2 shows a cross-sectional top view of a portion of a sash framing, as known in the art;

Figure 3 shows a cross-sectional top view of a partially assembled panel in its sash framing, as known in the art;

Figure 4 shows an isometric view of a first exemplary embodiment in accordance with the present invention;

Figure 5 shows a top view of the embodiment of Figure 4;

Figure 6 shows a side view of the embodiment of Figure 4;

Figure 7 shows a front view of the embodiment of Figure 4;

Figure 8 shows an isometric view of a second exemplary embodiment in accordance with the present invention;

Figure 9 shows a top view of the embodiment of Figure 8;

Figure 10 shows a side view of the embodiment of Figure 8;

Figure 11 shows a front view of the embodiment of Figure 8;

Figure 12 shows a front view of a variant of the embodiment of Figure 4;

Figures 13 to 16 each show a step during the installation of a panel provided with a security clip in accordance with the present invention into a sash framing;

Figures 17 and 18 each show a schematic top view of an embodiment, indicating exemplary measurements of a security clip in accordance with the invention; and

Figure 19 shows a schematic front view of another embodiment, indicating exemplary measurements of a security clip in accordance with the invention.

Description

Figures 4 to 7 show views of a security clip 10. In Figures 4 to 7, the same numerals are used for corresponding elements. The security clip 10 is made from spring steel and comprises a generally rectangular shelf 11 constituting a base 12. The generally rectangular layout of the shelf 11 has a long side defining the length of the base 12 and a short side defining the width of the base 12.

On one long side of the base 12, two cut-outs 15 are provided, at approximately one fifth of the length of the long side. Each cut-out 15 extends about half of the width of the base 12 into the base 12. The cut-outs 15 separate a central portion of the shelf 11 from two arms 14.

Each arm 14 is angled away from the base 12 at a bend 13, at an angle of approximately 30 degrees. In an embodiment, the angle is 33.3 degrees. Each arm 14 has an end edge 16, and the arms 14, being made from spring steel, constitute an obstructer that is may be resiliently pressed towards the base 12. The end edge 16 is a flat, straight edge. By way of the bend 13, the home position of the arms 14 is at an incline to the base 12. Thus, the arms 14 are biased to assume an angled-away position if depressed either towards the base 12 or away from the base 12.

The central portion of the shelf 11 comprises an upright portion 18 formed by a right-angle bend extending in the direction opposite of the arms 14. In other words, the two arms 14 can be said to flank the upright portion 18.

The surfaces comprising the included angle between the upright portion 18 and the base 12 are the panel-facing surfaces of the security clip 10. Thus, the surface of the base 12 that is opposite the arms 14 is a panel-facing surface of the base 12. Likewise, the upright portion 18 comprises a panel-facing surface 19.

Figures 8 to 11 show views of a security clip 20, with the same numerals being used for corresponding elements. Akin to the security clip 10 of Figures 4 to 7, the security clip 20 is made from spring steel and comprises a generally rectangular shelf 21 constituting a base 22. The generally rectangular layout of the shelf 21 has a long side defining the length of the base 22 and a short side defining the width of the base 22.

On one long side of the base 22, two cut-outs 25 are provided, at approximately one fifth of the length of the long side. Each cut-out 25 extends about half of the width of the base 22 into the base 22. The cut-outs 25 separate a central portion of the shelf 21 from two arms 24.

Each arm 24 is angled away from the base 22 at a bend 23, at an angle of approximately 30 degrees. Each arm 24 has an end edge 26, and the arms 24, being made from spring steel, also constitute an obstructer that may be resiliently pressed towards the base 22. Each end edge 26 is a flat, straight edge. Near their end edges 26, each arm 24 comprises an obtusely-angled bend 26a to provide an end portion of the arm having a more acute angle. Different security clips 10 and 20, with differently shaped arms, such as arm 14 of the embodiment of Figures 4 to 7 and the arm 24 of the embodiment of Figures 8 to 11, may be required for different sash framing geometries. By way of the bends 23 and 26a, the home position of the arms 24 is at an acute incline relative to the base 22, such that the arms 24 are biased to assume their angled-away position if depressed either towards the base 22 or away from the base 22.

The central portion of the shelf 21 comprises an upright portion 28 formed by a right-angle bend extending in the direction opposite of the arms 24. In other words, the two arms 24 can be said to flank the upright portion 28.

The surfaces comprising the included angle between the upright portion 28 and the base 22 are the panel-facing surfaces of the security clip 20. Thus, the surface of the base 22 that is opposite the arms 24 is a panel-facing surface of the base. Likewise, the upright portion 28 comprises a panel-facing surface 29.

Figure 12 shows a security clip 10a, which is a variant of the security clip 10. The security clip 10a comprises two reinforcing ribs 18a in the right-angled bend of the upright portion 18 and one reinforcing rib 14a in the bend of each arm 14. The reinforcing ribs 14a and 18a improve the strength of the upright portion 18 and/or the arms 14, respectively. It will be understood that variants of the security clip 20 (see Figures 8 to 11) may also comprise reinforcing ribs in this or a similar manner.

An exemplary installation of the security clip to a sash will now be explained with reference to Figures 13 and 16.

For ease of explanation, it will be assumed that a security clip 20 as described with reference to Figures 8 to 11 is to be installed into a sash comprising components described above with reference to Figures 1 to 3.

Figure 13 shows a prior art sash configuration with a panel 30 mounted installed in its sash framing 50, prior to application of an internal bead.

In Figure 14, a double-sided sticky foam pad 8 is affixed at an appropriate location on the inner face 34 near the inner edge 36 (confer Figure 1) of the panel 30. The doublesided sticky foam pad 8 constitutes an adhesive pad. By way of the foam, the sticky pad is compressible. This allows the foam pad to be squeezed, for instance if necessary to accommodate reinforcing ribs at the upright portion of the security clip 20. The two sticky sides of the foam pad 8 allow the adhesive area of a security clip 20 to be affixed to the panel 30.

In Figure 15, the security clip 20 is affixed to the panel 30. More specifically, the upright portion 28 (confer Figure 8) is affixed by its adhesive area of the sticky pad 8 to the inner face 34 of the panel 30 (confer Figure 1). The upright portion 28 helps the base 22 of the clip 20 to be aligned with the inner edge 36 of the panel 30. The arms 24 of the security clip 20 are angled away from the base 22 and extend into the air pocket 52 of the sash framing 50. The end edges 26 of the arms 24 overhang one of the walls (wall 54 in Figure 15). As can be seen from Figure 15, there is no need to install and align another component of a security clip arrangement onto the sash framing 50, because the element to cooperate to provide a resistive engagement with the arms 24 is provided by the wall 54.

The straight end edge 26 extends to near a corner of the wall 54. Under a load, this ensures that the full length of the end edge 26 may engage with the corresponding length of an inner corner of the wall 54 without being able to slip out of the resistive engagement.

As shown in Figure 15, the base 22 (confer Figure 8) extends over most of the thickness of the border 38, but leaves a small gap of the spacer material 40 exposed and does not make contact with the adjacent surface 43 of the outer glass pane 42 (confer Figure 1). As such, the base 22 does not extend over the full thickness of the border 38. Thereby, the base 22 is dimensioned to avoid thermally bridging the inner pane 32 and the outer pane 42.

In Figure 16, an internal bead 60 is provided on the interior side of the sash framing 50, to close the air pocket 52. The arrangement of Figure 16 shows a sash arrangement as it would be installed in a door or window (or as a non-opening window).

Because the end edges 26 of the arms 24 hang over the wall 54, if a force is applied in a direction indication by arrow F in Figure 16, this would bring the ends 26 of the arms 24 into resistive engagement with the wall 54 and resist a pushing of the panel 30 out of the sash framing 50.

Because the security clip 20 is affixed to the panel 30 by the adhesive area of the sticky pad 8, no screws are required that might potentially damage components of the panel 30. As the adhesive connection is provided between the upright portion 28 and the inner face 34, the base 22 of the security clip is free to bend away from the border 38 under a load. This may help to distribute peak leads during an attempted intrusion. This may assist in maintaining a resistive engagement if an attempt is made to push the panel 30 sideways.

By providing an adhesive connection on the inside face 34, rather than on the border 38, a force in a direction indicated by arrow F acts towards the adhesive connection. This reduces the risk of the clip detaching from the panel under a load.

Figure 17 shows an illustrative top view of the security clip 10. The base of the security clip 10 has a width 72 of 23 mm. This is an appropriate width suitable for avoiding, when installed, thermally bridging the inner pane and the outer pane of a large range of commercially available panels. The upright portion 18 of the security clip 10 has a length 70 of 10 mm. This length 70 is suitable to ensure for a large range of sash framing geometries that the upright portion 18 is covered by a subsequently installed inner bead. This allows the security clip 10 to remain hidden from view, when installed, while providing a sufficiently large contact area for adhesive. The bend 13 of each arm is spaced a distance 74 of 12 mm from the edge of the upright portion 18, which is about half of the width 72 of 23 mm. The height 76 of each arm 14 from the base is 7 mm and each arm 14 extends forward of the bend 13 by a distance 78 of 10 mm.

Figure 18 shows an illustrative top view of the security clip 20. The base of the security clip 20 has the same width of 23 mm as the security clip 10, and the upright portion 28 has the same length of 10 mm as the upright portion 18. Also, the base bend 23 is spaced about 12 mm (about half the width of the base) from the edge of the upright portion 18. Each arm 24 may be defined by a first height 82 from the base to the bend 26a, the first height being 8 mm, and by a second height 84 from the base to the end edge 26 of the arm, the second height being 9 mm. I.e., in total, the arm 24 protrudes no more than 9 mm, as defined by the second height, from the base. The arm 24 extends forward of the base bend 23 a distance 80 of 17.5 mm, i.e., the arm 24 extends beyond the upright portion 28. The length of the end section 86, from the bend 26a to the end of the arm 24, is about 5 mm.

Figure 19 shows an illustrative front view of the security clip 10, which is also representative for the security clip 20. The security clip 10 has a total length 88 of 70 mm. The centre portion constituting the upright portion has a length 70 of 10 mm and a width 90 of 40 mm. Each arm 14 has a width 92 of 13 mm. As such, the width 92 of each arm 14 is about one fifth of the total length of 88 mm of the security clip 10.

The thickness of the metal sheet constituting the security clip may be 1 mm.

The measurements provided for Figures 16 to 18 are exemplary and approximate, and can in practice also deviate by +/-1, 2, or 3 mm. E.g., the width 72 of the security clips 10, 20 is provided as 23 mm, but may in practice be approximately 20 mm or 25 mm.

The security clip of the present invention can be provided for many panel thicknesses and sash framing profiles. The arms constituting the obstructer may be shaped according to the sash framing profiles, such that a resistive engagement between a wall of the profile and the security clip can be ensured.

Claims

CLAIMS:

1. A security clip for resisting the pushing of a panel out of its sash framing, the sash framing being of a type having a circumferentially extending profile providing an air pocket between a border of the panel and the sash framing, the security clip comprising a base and an obstructer, the base configured for fixing the clip to the panel at the border of the panel, the obstructer having an end edge extending from the base, wherein the obstructer is angled away from the base such that, when the security clip is fixed to the panel in its sash framing, the end edge of the obstructer extends at an acute angle from the border into the air pocket such that an attempt to push the panel out of its sash framing brings the end edge of the obstructer into engagement with a wall of the air pocket, to resist a pushing of the panel out of its sash framing.

2. The security clip in accordance with claim 1, wherein the base further comprises an upright portion for aligning the security clip at an edge of the panel.

3. The security clip in accordance with claim 1 or claim 2, further comprising an adhesive area for affixing the security clip to the panel.

4. The security clip in accordance with claim 3 when dependent from claim 2, wherein the adhesive area is provided on a panel-facing surface of the upright portion.

5. The security clip in accordance with claim 4, wherein the security clip is configured for affixing to the panel via the upright portion, thereby allowing the base to bend away from the panel under a load while the security clip remains affixed to the panel.

6. The security clip in accordance with any one of claims 3 to 5, wherein the adhesive area is provided by an adhesive pad.

7. The security clip in accordance with claim 6, wherein the adhesive pad is compressible to a thickness of less than 90% of its uncompressed thickness.

8. The security clip in accordance with any preceding claim, wherein the acute angle is no more than 45, 40, or 35 degrees, and/or no less than 15, 20, 25, or 30 degrees.

9. The security clip in accordance with any preceding claim, wherein the base is dimensioned to avoid thermally bridging an inner pane and an outer pane of the panel.

10. The security clip in accordance with any one of the preceding claims, wherein the obstructer comprises two arms.

11. The security clip in accordance with any one of claims 2 to 10, wherein the obstructer extends beyond the upright portion.

12. The security clip in accordance with any one of the preceding claims, stamped from sheet metal.

13. A door or window sash comprising a sash framing and a panel in its sash framing, wherein the panel comprises a plurality of security clips in accordance with any one of the preceding claims.

14. The panel in accordance with claim 13, comprising at least four of said security clips.

15. The panel in accordance with claim 13 or claim 14, wherein the security clips are fixed by an adhesive between the panel-facing surface on an upright portion of the security clip and the inside-facing surface of the panel.

16. A security clip substantially as hereinbefore described with reference to any of Figures 4 to 12 and 15 to 19.

17. A door or window sash comprising a sash framing, a panel in its sash framing, and a plurality of security clips affixed to the panel substantially as hereinbefore described with reference to any of Figures 15 and 16.