A door leaf for a security door

Abstract

A door leaf 100 for a security door that is easy to transport, comprising first 102 and second 104 door leaf sections or panels, where one or more of the sections is to be secured to a doorframe via h

Description

The present disclosure relates to a door leaf for a security door, a security door assembly and a method of assembling the security door. In particular, the disclosure is concerned with a door leaf for a security door that comprises two or more panels. Background There are numerous known designs of security doors available. Such security doors are more robust and durable than standard doors. They are designed to be securely fitted to a door frame to limit and / or prevent tampering. For example, they are designed to prevent opening of the door in a locked state and they may have features to help prevent their removal from the door frame. Security doors are designed to withstand high impact forces, for example from manual attacks, ballistic rounds and / or explosive devices, and so need to have a relatively high strength. To achieve the necessary strength and security, security doors are often manufactured as a single unit from steel, aluminium, or metal alloy. They are typically fitted with sturdy side fixings so that a device such as a crowbar cannot be used to prise the door from the frame. However, the security door panel is typically heavy and cumbersome and so is difficult to transport to the location at which the door leaf is to be fitted. Installation of the door leaf can be problematic as they are typically installed in environments in which there is limited space. In addition, the door leaf may need to be transported through narrow or tight spaces or in a discrete manner. Efforts to split the security door into multiple sections are prone to problems with misalignment, which reduces the effectiveness of the security door as misalignments tend to lead to cracks / openings which can be exploited to gain access through the door. It is prohibitively expensive to machine separate sections of the door to be perfectly flat and imperfections will be introduced during the installation process in any event. In some cases, shims have been inserted between different sections of the door, but this would be extremely time consuming and difficult to get right. In other example, sections of the door may be oversized and cut-down to the correct size in-situ. However, this requires specialist cutting tools to be present on site and would be prohibitive from a cost perspective. It is an objective of the present invention to overcome one or more of the above referenced problems. Summary In one example, there is provided a door leaf for a security door, the door leaf comprising: a first door leaf section, a second door leaf section, where one or more of the first door leaf section and the second door leaf section are configured to be secured to said doorframe via one or more hinges; a fulcrum located between the first section and the second section, wherein at least part of the first section is pivotable relative to the second section about the fulcrum; and one or more adjustment fixtures are configured to pivot the at least part of the first section relative to the second section about the fulcrum. The provision of the door leaf as set out above enables the installer of the door to be able to install the door in-situ and then align the first section and the second section to be in one plane. This enables separate sections of the door leaf to be transported independently, which is important when transporting in tight conditions and then installing in-situ. The adjustment fixtures allow the sections to be pivoted relative to each other which means that the sections can be properly aligned, which leads to a highly secure door and reduces possible weaknesses. In one example, the fulcrum comprises one or more strips extending a substantial length of the of the first section and the second section. The width of the fulcrum is less than the width of the door sections. The fulcrum provides a mechanism for allowing the rotation. The one or more strips may comprise a first strip and a second strip wherein the first strip is stacked on top of the second strip and wherein the first strip and the second strip are coupled together. The provision of two strips enables an efficient mechanism for providing a fulcrum. In one example, a width of the first strip is less than a width of the second strip. This enables one or more adjustment fixtures to have a bearing surface on the second strip, in use, which avoids the adjustment fixture pressing on the one or more door sections, in use. In one example, the fulcrum comprises one or more through-holes extending through the first strip and the second strip. This allows one or more connection fixtures to extend through the fulcrum. In one example, the first section comprises: a first panel; and a first angle section arranged at an end of the first panel, the first angle section comprising a connecting leg and a return leg, wherein the connecting leg of the first angle section is coupled with the first panel such that the return leg extends away from the end of the first panel in a direction substantially perpendicular to the first panel, wherein the second section comprises: a second panel; and a second angle section arranged at an end of the second panel, the second angle section comprising a connecting leg and a return leg, wherein the connecting leg of the second angle section is coupled with the second panel such that the return leg extends away from the end of the second panel in a direction substantially perpendicular to the second panel, wherein the fulcrum is arranged between the return leg of the first angle section and the return leg of the second angle section. The first angle section and the second angle section provide surfaces of the door sections in which the fulcrum may be located between. In one example, the first section comprises a first panel, wherein a region towards the end of the panel is folded relative to a main body of the first panel to provide a return leg that extends in a direction substantially perpendicular to the main body of the first panel, and wherein the second section comprises a second panel, wherein a region towards the end of the second panel is folded relative to a main body of the second panel to provide a return leg that extends in a direction substantially perpendicular to the main body of the second panel, wherein the fulcrum is arranged in between the return leg of the first panel and the return leg of the second panel. In this arrangement, a separate angle section is not required, but the first section and the second section are still suitable for having a fulcrum therebetween. In one example, the return leg of the first section comprises one or more connection through-holes and the return leg of the second section comprises one or more connection through-holes. These connection through-holes enable the connection fixture to pass through to connect the first section to the second section. In one example, the connection through-holes are spaced along the length of the first section and the second section. The connection through-holes in the first section and the second section are to be aligned with the through-holes in the fulcrum. In one example, the door leaf comprises one or more connection fixtures configured to extend through the connection through-hole of the return leg of the second section, the through-hole of the fulcrum and the connection through-hole of the return leg of the first section to couple the first section, the fulcrum and the second section together. The connection fixtures enable the first door section and the second door section to be coupled together. In one example, the second section comprises: a first row of adjustment through-holes for receiving the one or more adjustment fixtures, the first row of adjustment through-holes located on a first side of the one or more connection through-holes; and a second row of adjustment through-holes for receiving the one or more adjustment fixtures, the second row of adjustment through-holes located on a second side of the one or more connection through-holes. The adjustment through-holes allows the adjustment fixtures to pass through. In one example the door leaf comprises a junction plate configured to cover a join between the first section, the fulcrum and the second section, wherein the junction plate is coupled with one of the first section or the second section. The junction plate is configured to cover the join and may also help with the alignment between the first section and the second section. In one example, the door leaf comprises a third door leaf section, a second fulcrum located between the third section and the second section, wherein at least part of the third section is pivotable relative to the second section about the second fulcrum; and one or more second adjustment fixtures are configured to pivot the at least part of the third section relative to the second section. In this example, the door leaf comprises three distinct sections that can be transported independently and then constructed on site. In one example, the door leaf comprises a plurality of dog bolts along a hinge side of the panel comprising the hinge, wherein the dog bolts comprise a curved outer surface. The curved outer surface allows that door leaf to rotate about the hinge in an effective manner. According to one aspect, there is provided a security door assembly comprising the door leaf as described above; and a door frame to which the door leaf is coupled via the one or more hinges. According to one aspect, there is provided a method of assembling a security door comprising: securing a first door leaf section to a doorframe via one or more first hinges; securing a second door leaf section to the first section; and pivoting at least part of the first section relative to the second section about a fulcrum by adjusting a position of an adjustment fixture. This method enables the door sections to be transported independently and then adjusted in use. Brief Description of the Drawings Examples of the present disclosure will now be described with reference to the accompanying drawings, in which: Figure 1 shows a schematic example of a door leaf comprising a first door section and a second door section that are misaligned; Figure 2 shows a schematic example of a door leaf comprising a first door section and a second door section that are aligned; Figure 3 shows a schematic example of part of the first door section, part of the second door section and a fulcrum; Figures 4 and 5 show a schematic example of the fulcrum; Figures 6 and 7 show a side view of the first door section and the second door section in a misaligned state; Figure 8 shows a side view of the first door section and the second door section in an aligned state; Figures 9 and 10 show a side view of a third door section and the second door section in a misaligned state; Figure 11 shows a side view of the third door section and the second door section in an aligned state; Figure 12 shows an example of a schematic view of the join between the first section and the second section; Figure 13 shows an example of a door leaf fully assembled in a door frame in an open configuration; Figures 14 shows a perspective view of a dog bolt; Figure 15 shows another perspective view of the dog bolt; Figure 16 shows a top view of the dog bolt; Figure 17 shows a side view of the dog bolt; Figure 18 shows a top view of the assembled door leaf illustrating the range of movement through which the dog bolt moves as the door leaf rotates about the hinge; Figures 19 and 20 show perspective views of the door leaf one-third assembled in the door frame in the open configuration; Figures 21 and 22 show perspective views of the door leaf two-thirds assembled in the doorframe in the open configuration; and Figures 23 and 24 show perspective views of the door leaf fully assembled in the door frame in the open configuration. Detailed Description Figures 1 and 2 show schematic examples of a door leaf 100 for a security door. The door leaf 100 comprises a first door section 102 and a second door section 104. The schematics shown in figures 1 and 2 are merely examples and the door leaf 100 may comprise more than two door sections, for example three door sections. The first door section 102 and the second door section 104 are each configured to be secured to a doorframe 108 via one or more hinges. That is the first door section 102 is configured to be attached to the doorframe 108 via one or more first hinges (not shown) and the second door section 104 is configured to be attached to the door frame 108 via one or more second hinges (not shown). The first door section 102 and the second door section 104 are located on either side of a fulcrum 110 (shown in more detail in figures 3, 4 and 5). In other words, the fulcrum 110 is located between the first section 102 and the second section 104 and allows at least part of the first section 102 to pivot (or rotate) relative to the second section 104 due to the action of one or more adjustment fixtures, which will be described in more detail below. In the highly schematic example of Figure 1, the first section 102 and the second section 104 are vertically misaligned with respect to each other. In other words, they don’t not share a common axis or extend in a single plane. In Figure 1, the whole of the first section 102 and the second section 104 are shown as twisted, but in reality, there may only be a local region of the first section 102 that is misaligned with respect to the second section 104. In the highly schematic example shown in Figure 2, the first section 102 and the second section 104 are aligned with one another. That is to say that they share a common axis and extend in the same plane. In order to transition from the misaligned configuration shown in Figure 1 and the aligned configuration shown in Figure 2, the one or more adjustment fixtures are moved to adjust a relative position of the first section 102 and the second section 104. Figure 3 shows a highly schematic example of a cross section of a junction between the first section 102 and the second section 104. As shown in figure 3, the first section 102 and the second section 104 are located on either side of the fulcrum 110. The first section 102 is configured to abut one side of the fulcrum 102 and the second section 104 is configured to abut a second side of the fulcrum 104. The fulcrum is described in more detail in Figures 4 and 5. A connection through hole 112 is shown by dashed lines in Figure 3. In one example, there is a connection through hole 112 in the first section 102, the second section 104 and the fulcrum 110. This enables a connection fixture (not shown) to extend through the first section 102, the fulcrum 110 and the second fixture 104 to couple these elements together. However, it should be noted that as they are coupled together at a single point across the width of the junction, there is scope for the first section 102 to rotate relative to the second section 104 about the fulcrum 110. Figure 3 also shows an adjustment fixture 114. The adjustment fixture 114 is configured to adjust a relative position of the first section 102 relative to the second section 104. In the example shown in Figure 3, the adjustment fixture 114 passes through a first adjustment through-hole 116 in the second section 104. In this example, the adjustment fixture 114 is configured to bear on a surface of part of the fulcrum 110 to one side of the connection through-hole 112. In other examples, the adjustment fixture 114 is configured to bear directly on a surface of the first section 102, however, it is more advantageous for the adjustment fixture 114 to bear on the surface of the fulcrum 110 as the hardness of the fulcrum 110 may be greater than the hardness of the first section 102. The adjustment through-hole 116 in this example may be threaded and an outer surface of the adjustment fixture 114 may be partially or totally threaded with a corresponding thread. The adjustment fixture 114 can then be screwed in the adjustment through-hole 116 to push on the fulcrum 110 on a first side of the connection through-hole 112. As such, in this case, there will be a relative pivot about the fulcrum 110 between the first section 102 and the second section 104. In one example, the adjustment fixtures 114 have a ball-bearing located at their bearing surface. The ball-bearing is held within a complimentary shaped recess in the adjustment fixture 114. That is, the adjustment fixtures 114 may be ball-end thrust screws. These allow a straight-line force to be exerted down the axis of the screw 114 from a non-perpendicular direction onto a bearing surface without any rotational force at the end of the screw 114 as would be caused by a flat ended bolt biting into the surface. If there was a misalignment in the other direction, then the adjustment fixture 114 could be removed from the first adjustment through-hole 116 and placed in a second adjustment through-hole 118. In this case, the adjustment fixture 114 would bear upon a second side of the fulcrum 110, thereby urging the relative rotation of the first section 102 and the second section 104 to rotate about the fulcrum 110 in a different orientation. In this example, instead of the adjustment through-hole(s) 116, 118 being threaded, one or more threaded nuts may be attached adjacent to the through-holes 116, 118. This would also allow the adjustment screws 114 to be moved in a controlled manner through the adjustment holes 116, 118 to adjust the position of the first section 102 relative to the second section 104. The adjustment through-holes 116, 118 may include a first row of adjustment through-holes 116 for receiving the one or more adjustment fixtures 114, the first row of fixture through-holes located on a first side of the one or more connection through-holes 112. Further, the adjustment through-holes may comprise a second row of adjustment through-holes 118 for receiving the one or more adjustment fixtures 114. The second set of adjustment through-holes 118 located on a second side of the one or more connection through-holes 112. In one example (as shown in Figure 3), the first section 102 comprises a panel 120 and a first angle section 122 that are coupled tougher. The angle section 122 may be a rolled-steel section. The angle section 122 may have a connecting leg 124 and a return leg 126 which are arranged to extend in substantially perpendicular directions to each other. The connecting leg 124 of the first angle section 122 is coupled with the first panel such that the return leg extends away from the end of the first panel 120 in a direction substantially perpendicular to the first panel 120. In a similar arrangement (as shown in the example of Figure 3), the second section 104 comprises a second panel 128 and a second angle section 130 that are coupled tougher. The second angle section 130 may be a rolled-steel section. The second angle section 130 may have a connecting leg 132 and a return leg 134 which are arranged to extend in substantially perpendicular directions to each other. The connecting leg 132 of the second angle section 130 is coupled with the second panel 128 such that the return leg 134 extends away from the end of the second panel 128 in a direction substantially perpendicular to the second panel 128. As shown in Figure 3, in this example the fulcrum 110 is located between the return leg 126 of the first angle section 122 and the return leg 134 ofthe second angle section 130. In another example (not shown in the figures), the return leg 126,134 may be provided by a folded section of the panels 120, 128. That is to say that a region towards the end of the first panel 120 may be folded relative to a main body ofthe first panel 120 to provide a return leg 126 that extends in a direction substantially perpendicular to the main body ofthe first panel 120. Similarly, the second section 104 comprises a second panel 128 and a region towards the end ofthe second panel 128 may be folded relative to a main body ofthe second panel 128 to provide a return leg 134 that extends in a direction substantially perpendicular to the main body ofthe second panel 128. The fulcrum is then arranged in between the return leg 126 ofthe first angle section and the return leg 134 ofthe second angle section. Figure 4 shows an example ofthe fulcrum 110 in more detail. In this example, the fulcrum 110 comprises a first strip 136 and a second strip 138. The first strip 136 is stacked on top ofthe second strip 138. The fulcrum 110 has a length, width and depth. The length is the largest dimension ofthe strip (indicated by L on Figure 5), the width is the second largest dimension of the strip (indicated by W in Figure 4) and the depth is the smallest dimension ofthe strip (indicated by D in Figure 4). In the Figures 4 and 5, the strips are arranged such that the combined depths ofthe individual strips form the overall depth ofthe fulcrum 110. The first strip 136 and the second strip 138 may be bonded together, for example by welding. A width ofthe first strip 136 is less that a width ofthe second strip 138. This aids with the provision ofthe fulcrum effect provided by the fulcrum 110. The second strip 138 may also provide a surface on which the one or more adjustment fixtures 114 can push on. As indicted above, where the adjustment fixture 114 comprises a ball bearing at the end, a straight-line force can be exerted down the axis ofthe screw 114 from a non-perpendicular direction onto a bearing surface without any rotational force at the end ofthe screw as would be caused by a flat ended bolt biting into the surface. Figure 5 shows the longitudinal axis Lf ofthe fulcrum 110. In use, the first section 102 and the second section 104 are rotatable relative to each other about the longitudinal axis Lf ofthe fulcrum 110. In use, the fulcrum 110 may extend in a substantially horizontal direction and so the first section 102 and second section 104 are pivotable about a substantially horizontal axis. As shown in Figure 5, the fulcrum 110 comprises one or more connection through-holes 140. The one or more connection through holes 140 ofthe fulcrum 110 combine with connection through-holes in the first section 102 and the second section 104 to form the connection through-hole 112 shown in Figure 3. The one or more connection through-holes 140 may be spaced along the length of the fulcrum 110. That is to say that in one example, there may be a plurality of connection through-holes 140 in the fulcrum 110 arranged in a line along the length of the fulcrum 110. The spacing between adjacent through-holes 140 may be even or uneven. As shown in figure 5, the first strip 136 of the fulcrum may include one or more indents 142. These indents 142 are located at the position in which the one or more adjustment fixtures 114 may be located in use. The indents 142 provide a spacing between the one or more fixtures 114 and the first strip 136. As implied in Figure 5 (and shown in more detail in Figure 12), the connection through-holes 140 (and fixtures) are located at a different locations along the length of the fulcrum 110. The depth of the first strip 136 may be identical to the depth of the second strip 138. In one example, a depth of the first strip 136 and the second strip 138 is approximately 1mm. Figures 6 to 8 are schematic examples of the junction between the first section 102 and second section 104 and show an example of the movement of the first section 102 relative to the second section 104. In Figures 6 to 8, there is a first adjustment fixture 114A shown on a first side of a connection fixture 144 and a second adjustment fixture 114B on a second side of the connection fixture 144. In practice, there would be no need for both the first adjustment fixture 114A and the second adjustment fixture 114B in the same location as rotation would only be required in one direction and if both adjustment fixtures 114A, 114B were utilised together, they may create a gap between the first section 102 and the second section 104. It should also be noted that the arrangement of the connection fixtures 144 and the adjustment fixtures 114 may preferably be offset as shown in Figure 12. The longitudinal axis of the connection fixture 144 is configured to be substantially parallel with the longitudinal axis of the second section 104. For example, in use, the longitudinal axis of the connection fixture 144 is configured to be substantially vertical (for a door designed to stand vertically). In some examples, the one or more adjustment fixtures have a recessed head section for receiving a tool, such as an Allen key), for facilitating rotation. Further, in the example shown in Figures 6 to 8, threaded nuts are located adjacent to the adjustment through-holes and the threaded adjustment fixtures 114 extend through these nuts to facilitate movement. Figures 6 to 8 also show a junction plate 152 located to overlap the first section 102 and the second section 104. The junction plate 152 is configured to hide the boundary between the first section 102 and the second section 104. The junction plate 152 may be welded to the second panel 104. The junction plate 152 may have one or more alignment studs 150 that pass through alignment holes of the first panel 102. The junction panel 152 is configured to protect the joint between the first panel 102 and the second panel 104 from attack / interference. In order to use the adjustment fixtures 114A, 114B, it is necessary to slacken slightly the connection fixture 144 and the alignment studs 150 to allow the panels 102, 104 to rotate around the fulcrum 110. Once the adjustment fixtures 114A, 114B are set a locknut may be used to prevent them moving. In the example shown in Figure 6, the first door section 102 and the second door section 104 are misaligned. That is to say that an adjoining surface of the first door section 102 is not parallel with an adjoining surface of the second door section 104. The arrow A indicates the relative movement required of the adjustment fixture 114B to re-align the first door section 102 and the second door section 104 to the aligned position shown in Figure 8. Movement of the adjustment fixture 114B may simply adjust the relative position of the first section 102 and the second section 104 in a local region around the adjustment fixture 114B. Axial movement of the adjustment fixture 114B will cause a force to be imparted on the first door section 102, which will cause relative rotation between the first section 102 and the second section 104 about the fulcrum 110 in the direction indicated by arrow B. In the example shown in Figure 7, the first door section 102 and the second door section 104 are misaligned, but in a different direction to the example shown in Figure 6. The arrow A indicates the relative movement required of the adjustment fixture 114A to re-align the relative position of the first door section 102 and the second door section 104 to the position shown in Figure 8. That is to say that axial movement of the adjustment fixture 114A will cause a force to be imparted on the first door section 102, which will cause relative rotation about the fulcrum 110 in the direction indicated by arrow B. Figure 8 shows an aligned arrangement of the first door section 102 and the second door section 104. That is to say that the first door section 102 and the second door section 104 extend substantially along the same axis. Figures 9 to 11 show an example of the door leaf 100 in which there is a third door section 106. The third door section 106 is identical to the first door section 102 except that it is typically located above the second door section 104 and so is mirrored relative to the first section 102. . Individual features of the third door section 106 are not repeated here for conciseness, but effective any features described in the above in relation to the first section 102 would also apply to the third section 106. In some examples, the first door section 102 is a lower door section, the second door section 104 is a central door section, and the third door section 106 is an upper door section. In Figures 9 to 11, reference signs of similar elements have been incremented by 100 relative to figures 6 to 8. One difference between the examples shown in Figures 9 to 11 to that in Figures 6 to 8 is the position of the adjustment fixtures 214A, 214B are mirrored with respect to the position shown in Figures 6 to 8. However, the operation is substantially identical. A second fulcrum 210 is located between the second door section 104 and the third door section 106 and the third section 106 is rotatable relative to the second section 104 by axial movement of the adjustment fixtures 214A or214B. Further the junction plate 252 is welded with the second panel 104 and the alignment holes extend through the third section 106. Figure 12 shows a perspective schematic example of a junction between the first section 102 and the second section 104. Figure 12 shows how the adjustment fixtures 114 are offset from the connection fixtures 144 along the length of the door sections. Figure 13 shows an example of a door leaf 100 comprised of three door sections 102, 104, 106. In the example, shown in Figure 13, the first door section 102 and third door section 106 are secured to the door frame 108 via hinges 158. This is to allow the door leaf 100 to be universal, i.e., it can be either right or left hand hung by simply rotating it clockwise or anticlockwise. The first door section 102 is secured to the second door section 104 and the second door section 104 is secured to the third door section 106. Figure 13 also that the door leaf 100 comprises a plurality of dog bolts 154 fitted at along the hinge side of the door sections 102, 104, 106. Dog bolts 154 are shown from different views in figures 14 to 17. The are also known as security studs and are fixed to locking points along the hinge side of the door sections 102, 104, 106 to provide an additional layer of protection. The dog bolts 154 slot into the door frame 108 as shown in Figure 18. The dog bolts 154 are configured so that when the door sections 102, 104, 106 close in the door frame 108 they hold the hinge side of the door sections 102, 104, 106 securely in place in the event of an attempted breach, for example if an intruder attempted to cut or grind the hinges 158 to remove the door sections 102, 104, 106 from the doorframe 108. The dog bolts 154 in the present invention comprise a curved rear outer surface 156 which means that the dog bolt 154 does not extend considerably from the door sections 102,104, 106 and instead more closely follows the arc of the hinge side of the door sections 102,104,106 which results in a tighter and more positively engaged dog bolt 154. The dog bolts 154 are shown in situ in Figure 18. The door leaf 100 as set out above may be comprised within a security door assembly 300 comprising the door leaf 100 coupled to the door frame 108. The method of assembling the door leaf 100 within the doorframe 108 begins with securing the lowest door section, e.g., the first door section 102 closest to the floor, to the door frame 108. It is important to secure the door sections 102,104, 106 to the doorframe 108 in the correct order because the door sections 102, 104, 106 are heavy and attempting to secure the door sections 102, 104, 106 in a different order could injure the operators and / or damage the features of the security door assembly 300. A support jack (not shown) may be used to prop up and support the weight of the first door section 102 so that a single operator can correctly align the hinge side of the first door section 102 with the hinge 158 and then secure the hinge 158 to the first door section 102 without the need for a second operator. The support jack is positioned under the first door section 102 such that it is level with the inside of the base of the door frame 108. This ensures that the first door section 102 is supported at the correct height so that it may be correctly aligned with the hinge 158. The first door section 102 is then secured to the doorframe 108 via the hinge 158 as shown in Figures 19 and 20. Once the first door section 102 is secured to the doorframe 108 the second door section 104 is positioned so that it is adjacent to the first door section 102 such that they meet at the junction between them. The fulcrum 110 may be secured to the first section 102 prior to the installation of the second section 104. The second door section 104 is then secured to the first panel 102, for example by passing the alignment studs 150 through alignment holes of the first panel 102 and via the set of connection fixtures 144. At this stage, an adjustment fixture 114 may be inserted through one of the adjustment holes to rotate at least part of the first section 102 relative to the second section 104. Alternatively, the adjustment fixture 114 may be used to align the panels after the third door section 106 has been coupled to the second door section 104. If the door leaf 100 comprises a third door section 106, then once the second door section 104 has been secured to the doorframe 108, the third door section 106 is then positioned so that it is adjacent to the second door section 104 such that they meet at a junction between the second section 104 and the third section 106. The third door section 106 is secured to the door frame 108 via the one or more hinges 158. Once sufficiently secured to the door frame 108 the third door section 106 is joined to the second panel 104 via one or more connection fixtures 244. One or more adjustment fixtures 214 may then be used to adjust the relative position of the third section 106 relative to the second section 104. In one example, the door leaf 100 comprises a simple system of pushing the door leaf 100 to the left or right to centralise it in the door frame 108. A bolt may be used which tightens against the door frame 108 and thereby slides the door leaf 100 across to the left or right within the doorframe 108. Alternatively, it would be possible to slacken off the hinge fixings 154 and tap the door leaf 100 over from the inside with an instrument such as a mallet to centralise it. The door leaf 100 is suitable for having any off the shelf ironmongery fitted to it to satisfy many varied operational requirements. That is to say that the door leaf 100 may be regarded as a “door blank”. Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference. 5 All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and / or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and / or steps are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and 10 drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features. The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification 15 (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

Claims

1. A door leaf for a security door, the door leaf comprising:a first door leaf section,a second door leaf section,where one or more of the first door leaf section and the second door leaf section are configured to be secured to a doorframe via one or more hinges, andwherein the second door leaf section comprises:a first row of adjustment through-holes for receiving one or more adjustment fixtures, the first row of adjustment through-holes located on a first side of one or more connection through-holes; anda second row of adjustment through-holes for receiving one or more adjustment fixtures, the second row of adjustment through-holes located on a second side of the one or more connection through-holes; anda fulcrum located between the first section and the second section, wherein at least part of the first section is pivotable relative to the second section about the fulcrum; andone or more adjustment fixtures configured to pivot the at least part of the first section relative to the second section about the fulcrum.

2. The door leaf according to claim 1, wherein the fulcrum comprises one or more strips extending a substantial length of the first section and the second section.

3. The door leaf according to claim 2, wherein the one or more strips comprise a first strip and a second strip wherein the first strip is stacked on top of the second strip and wherein the first strip and the second strip are coupled together.

4. The door leaf according to claim 3, wherein a width of the first strip is less than a width of the second strip.

5. The door leaf according to any one of claims 3 to 4, wherein the fulcrum comprises one or more through-holes extending through the first strip and the second strip.

6. The door leaf according to any one of claims 1 to 5, wherein the first section comprises:a first panel; anda first angle section arranged at an end of the first panel, the first angle section comprising a connecting leg and a return leg,wherein the connecting leg of the first angle section is coupled with the first panel such that the return leg extends away from the end of the first panel in a direction substantially perpendicular to the first panel,wherein the second section comprises:a second panel; anda second angle section arranged at an end of the second panel, the second angle section comprising a connecting leg and a return leg,wherein the connecting leg of the second angle section is coupled with the second panel such that the return leg extends away from the end of the second panel in a direction substantially perpendicular to the second panel,wherein the fulcrum is arranged between the return leg of the first angle section and the return leg of the second angle section.

7. The door leaf according to any one of claims 1 to 5, wherein the first section comprises a first panel, wherein a region towards the end of the panel is folded relative to a main body of the first panel to provide a return leg that extends in a direction substantially perpendicular to the main body of the first panel, andwherein the second section comprises a second panel, wherein a region towards the end of the second panel is folded relative to a main body of the second panel to provide a return leg that extends in a direction substantially perpendicular to the main body of the second panel, wherein the fulcrum is arranged in between the return leg of the first panel and the return leg of the second panel.

8. The door leaf according to claim 6 or 7, wherein the return leg of the first section comprises one or more connection through-holes and the return leg of the second section comprises one or more connection through-holes.

9. The door leaf according to claim 8 when dependent on claim 5, wherein the door leaf comprises one or more connection fixtures configured to extend through the connection through-hole of the return leg of the second section, the through-hole of the fulcrum and the connection through-hole of the return leg of the first section to couple the first section, the fulcrum and the second section together.

10. The door leaf according to any one of claims 1 to 9, wherein the door leaf comprises a junction plate configured to cover a join between the first section, the fulcrum and the second section, wherein the junction plate is coupled with one of the first section or the second section.

11. The door deaf according to any one of claims 1 to 10, comprising a third door leaf section, a second fulcrum located between the third section and the second section, wherein at least part of the third section is pivotable relative to the second section about the second fulcrum; andone or more second adjustment fixtures configured to pivot the at least part of the third section relative to the second section.

12. The door leaf according to any one of claims 1 to 11, wherein the door leaf comprises a plurality of dog bolts along a hinge side of the panel comprising the hinge, wherein the dog bolts comprise a curved outer surface.

13. A security door assembly comprising: the door leaf of any one of claims 1 to 12; and a door frame to which the door leaf is coupled via the one or more hinges.

14. A method of assembling a security door comprising:securing a first door leaf section to a doorframe via one or more first hinges; securing a second door leaf section to the first section, wherein the second section comprises:a first row of adjustment through-holes for receiving one or more adjustment fixtures, the first row of adjustment through-holes located on a first side of the one or more connection through-holes; anda second row of adjustment through-holes for receiving the one or more adjustment fixtures, the second row of adjustment through-holes located on a second side of the one or more connection through-holes; andpivoting at least part of the first section relative to the second section about a fulcrum by adjusting a position of the one or more adjustment fixtures.

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