Door hinge

Abstract

A door hinge comprising a door piece and a frame piece connected by a hinge pin, the door piece having a first mounting part 52 and a second mounting part 54 that are at an angle to each other, enabli

Description

FIELD OF THE INVENTION This invention relates to door hinge, and in particular to an adjustable door hinge for a plastics window. In this specification, directional and orientational terms such as “up”, “down”, “top” etc. will refer to the hinge when fitted to the vertical edge of a door and its surrounding frame. BACKGROUND TO THE INVENTION Hinges are commonly fitted to openable panels such as doors. The hinge typically has a door piece which is securely mounted to the openable door, and a frame piece which is securely mounted to the frame surrounding the door. The hinge includes a hinge pin by which the door piece can pivot or swing relative to the frame piece. Two or three hinges may be fitted at spaced locations on a particular door, with the hinge pins aligned, and which together enable the door to pivot or swing relative to the frame between open and closed positions. Many hinges are adjustable whereby the position of the door can be adjusted relative to the frame. The adjustment occurs between the door piece and the frame piece and it is therefore not necessary to reposition the door piece relative to the door, or to reposition the frame piece relative to the frame. A first direction of adjustment is vertical whereby the position of the door may be adjusted upwardly and downwardly relative to the frame. A second direction of adjustment is horizontal. Adjustments in the first direction and the second direction are aligned parallel to the plane of the door. A third direction of adjustment is also horizontal but perpendicular to the plane of the door. This direction of adjustment moves the plane of door (when closed) towards and away from the plane of the frame and thereby adjusts the compression of the sealing elements which typically lie between the door and frame. A hinge which can be adjusted in these three orthogonal directions is disclosed in DE 196 07 846, specifically for a hinged sash window. The hinge comprises a frame piece which is secured to the frame by frame-adjustment screws and a sash piece which is secured to the sash by sash-adjustment screws. The sash piece is mounted to the frame piece by a hinge pin. The hinge pin is threaded and is located in a correspondingly-threaded recess in the frame piece of the hinge. The hinge can be adjusted in the first direction (vertically) by rotation of the threaded part of the hinge pin. The hinge can be adjusted horizontally (in the second direction) by rotation of the sash-adjustment screws, the sash-adjustment screws being aligned with the plane of the sash. The hinge can be adjusted horizontally (in the third direction) by rotation of the frame-adjustment screws, the frame-adjustment screws being aligned perpendicular to the plane of the sash. Other hinges which can be adjusted in the same three orthogonal directions are disclosed in EP 3 680 432 and WO2016 / 146218. DE 196 07 846 is designed primarily for use on a sash window in which the window panel and the surrounding frame are made of timber, whereas EP 3 680 432 and WO2016 / 146218 are designed primarily for use on doors with a plastics profile. The detailed structure of a plastics profile door and its surrounding plastics profile frame is determined by the manufacturer or designer and many different profiles are available. The profiles nevertheless have certain common features. One common feature is that the profiles of the door and frame are made as extrusions which are largely hollow with internal webs to provide the required structural strength. Another common feature is the presence of external channels to accommodate sealing elements which lie between the door and its frame when the door is closed. Another common feature is an external “Euro-groove” to accommodate locking componentry by which the door can be locked to the frame in the closed position; the width of the Euro-groove is standardised whereby standardised locking components can be fitted. Another common feature is that the door piece and the hinge piece are usually secured to their respective profiles by a combination of location pegs and screw fasteners. A number of holes is preformed in the door and frame profile during manufacture, the holes being positioned to accommodate the location pegs of the hinge pieces and thereby facilitate the assembly of the door and frame. Starter holes may also be formed in the profiles for the screw fasteners. It is essential that the preformed holes for the location pegs, and the holes created for and by the screw fasteners, do not undermine the structural strength of the door and frame profile. The total number of holes which can be made in the profiles, and the separation of those holes, must therefore be controlled. A hinged door of plastics profile will often have one or more glass panels, typically double-glazed or triple-glazed glass panels. Such a door is relatively heavy and the hinges are therefore required to support a considerable weight. The mounting of the door piece and the mounting of the frame piece must both be sufficiently robust to support the considerable weight of the door over a long period of time. The location and structure of the internal webs of the profiles are determined so that the respective location pegs and screw fasteners for the door piece and for the hinge piece provide the required support. Nevertheless, since the door and window are not made of solid material, it is inevitable that the location pegs and screw fasteners will pass through some empty space inside the profile and will therefore not contribute wholly to supporting the hinge. It would be possible to increase the support for the hinge by increasing the size of the door piece and / or the frame piece and thereby permit an increase in the number of location pegs and / or screw fasteners. However, at least part of the hinge is visible in use and hinge manufacturers usually seek to minimise the size and thereby the aesthetic impact of their hinges. Alternative means of maximising the support for the hinge is therefore required. One further means to increase the support for the hinge is to secure the door piece around a corner of the door profile. Such an arrangement is shown in EP 1 445 409 for example. Fig.1 of EP 1 445 409 is reproduced as Fig. 1 of the present application for ease of reference, and the features which are shared with the present invention are described below. Using the numbering of EP 1 445 409, Fig.1 shows a hinge having a door piece 1 and a frame piece 2. The door piece 1 is mounted to the plastics profile 3 of a door, only part of which can be seen in Fig.1. In this embodiment the door has a plastics panel 10 but the plastics panel could for example be replaced by glazing. The frame piece 2 is mounted to the plastics profile of the fixed frame 11 surrounding the door. In known fashion, resilient sealing elements S lie between the door profile 3 and the frame profile 11. It will be seen that the plastics profiles 3 and 11 have internal webs (such as 17) which provide much of the structural strength of the profiles. The door piece 1 comprises a first mounting part 4 and a second mounting part 5 which are integrally formed and structurally rigid. Mounting surfaces of the first mounting part 4 and the second mounting part 5 engage respective parts of the door profile. Importantly, the first mounting part 4 and the second mounting part 5 are angled relative to each other and their mounting surfaces engage respective edges of a corner of the door profile 3. In this embodiment the corner of the door profile 3 is a right angle and the respective mounting surfaces of the first mounting part 4 and the second mounting part 5 are therefore perpendicular to each other. As seen in Fig.1, the first mounting part 4 lies against the front wall of the profile 3 whereas the second mounting part 5 lies against the edge wall 16 of the profile 3. Mounting the door piece 1 around a corner of the profile 3 in this way provides additional structural support for the fitted door piece 1. The door piece 1 is secured to the profile 3 by a combination of location pegs 14 and fastening screws 8. Whilst only one location peg 14 and one fastening screw 8 is visible in Fig. 1 there will typically be two location pegs 14 and multiple fastening screws. The fastening screw 8 passes through a preformed fastener hole in the second mounting part 5, through the edge wall 16 of the profile 3 and also through the web 17. The fastening screw 8 also passes through other webs which are located between the wall 16 and the web 17 and which are partially visible in Fig.1 but not numbered. The door manufacturer may provide a starter hole through the edge wall 16 and the webs to ensure the correct alignment of the fastener screw 8. Notwithstanding the wall 16 and webs through which the fastener screw 8 passes, it will be seen that portions of the fastener screw 8 are located in voids of the profile 3 and therefore the whole of the fastener screw 8 does not contribute to supporting the hinge. Further structural rigidity is provided by passing the fastener screw 8 through a threaded fixing hole in the location peg 14. The location peg 14 is integrally formed with the first mounting part 4 and projects into the profile 3 through a preformed hole 18. The location peg 14 has a threaded fixing hole which is aligned with the fastener hole in the second mounting part 5. The fastener screw 8 and peg 14 can thereby provide a rigid internal connection between the first mounting part 4 and the second mounting part 5 to supplement the rigid external connection between those parts. Between them these components surround and effectively clamp the corner of the profile 3, which significantly enhances the securement of the door piece 1 of the hinge. There will typically be further screw fasteners passing through preformed holes in the second mounting part 5 and through the edge wall 16 and webs (albeit without engaging location pegs 14) to provide the desired degree of securement and rigidity of the fitted door piece 1. The adjustment directions described above can all be understood in relation to Fig.1. It will be understood that the frame profile 11 is fixed in place and that adjustments of the hinge all move the door piece 1 (and thereby the door profile 3) relative to the fixed frame profile 11. Adjustments in the first direction A1 (see Fig.2) are perpendicular to the plane of the paper as viewed in Fig. 1, i.e. the door piece 1 and door profile 3 are moved towards and away from the viewer. Adjustments in the second direction A2 are in the plane of the paper and towards the top and bottom edges of the paper as viewed. Adjustments in the third direction A3 are also in the plane of the paper and towards the left and right edges of the paper as viewed. Whilst DE 196 07 846, EP 3 680 432 and WO2016 / 146218 disclose different methods to adjust the hinge in the third adjustment direction A3, a commonly-used method is to provide an eccentric hinge pin P (Fig. 1). It will be understood that as the door piece 1 pivots relative to the frame piece 2, the door piece 1 rotates around the (fixed) hinge pin P. With an eccentric hinge pin the part of the hinge pin around which the door piece 1 rotates is eccentric to the part of the hinge pin P which is connected to the frame piece 2. Rotating the hinge pin P relative to the frame piece 2 therefore moves the door piece transversely. The degree of eccentricity of the hinge pin is usually small, for example 1 mm, but a 1 mm adjustment in the third direction A3 is usually sufficient to increase or decrease the compression of the sealing elements S as required. It will be understood that the rotation of an eccentric hinge pin will adjust the position of the door piece 1 in both of the directions A2 and A3. Typically, the hinge pin will be rotated as desired to adjust the compression of the sealing elements S, followed by the separate adjustment in the second direction A2. When the hinge has been adjusted as required it is necessary to fix the eccentric hinge pin against further unwanted rotation, and this is typically achieved by clamping a grub screw against the eccentric hinge pin. The small size of the grub screw usually makes it impractical to fit a cover and the requirement for the grub screw to be accessible usually means that the grub screw is visible and can be unsightly. Also, it is understood that a grub screw will not always prevent unwanted rotation of the eccentric pin over the long term, so that repeated adjustment may be required. Also, the grub screw may become free of the hinge during the adjustment procedure, especially if the hinge is being adjusted by a non-skilled person; the small size of the grub screw means it can easily become lost if it inadvertently falls from the hinge. SUMMARY OF THE INVENTION It is an object of the invention to provide a door hinge which can provide increased structural rigidity without significantly increasing the size of the hinge components. It is another object of the invention to provide a door hinge with an eccentric hinge pin and which avoids the use of a grub screw to secure the eccentric pin. According to a first aspect of the invention there is provided a door hinge comprising a door piece and a frame piece interconnected by a hinge pin, the door piece having a first mounting part and a second mounting part, the first and second mounting parts being at an angle to each other for fitment around a corner of a door profile, the door piece having a first location peg and a fastener hole, the first location peg having a fixing hole aligned with the fastener hole, the door piece having a second location peg, the first location peg projecting from one of the first mounting part and the second mounting part, the second location peg projecting from the other of the first mounting part and the second mounting part. Accordingly, the first and second location pegs together project from both of the first mounting part and the second mounting part, which can increase the structural rigidity of the fitted door piece of the hinge. In common with the known door hinges, the fastener hole and the fixing hole can both accommodate a common threaded fastener. Also in common with the known door hinges, the first location peg projects from one of the first and second mounting parts and the fastener hole is formed through the other of the first and second mounting parts; a fastener can pass through the fastener hole in one of the mounting parts and through the fixing hole of the first location peg of the other mounting part whereby to provide a rigid internal connection for the door piece at the corner of the door profile. The fixing hole can be pre-threaded to accommodate a threaded fastener. Alternatively, the fixing hole can be plain to accommodate a self-tapping threaded fastener. Preferably, the first location peg projects from the first mounting part and the fastener hole is located in the second mounting part; during fitment a threaded (screw) fastener is inserted through the fastener hole in the second mounting part and through the fixing hole in the first location peg (and also through any intervening walls and webs of the plastic profile). The second location peg therefore projects from the second mounting part and may or may not have a fixing hole for accommodating a fastener. Even if the second location peg does not have a fixing hole it can nevertheless increase the structural rigidity of the fitted hinge. Preferably, there are two first location pegs with fixing holes. Desirably there are two second location pegs. Such an arrangement can provide two rigid internal connections and two additional rigid (second) location pegs. It has been found that with such an arrangement the size of the door piece can be similar, and at most not significantly larger than, the corresponding parts of known door hinges, and yet provide additional structural rigidity by way of the additional (second) location pegs. Preferably, the second location peg(s) are integrally mounted to the door piece and the first location peg(s) are removably mounted to the door piece. Desirably, the second location peg(s) are integrally mounted to the second mounting part of the door piece. In a hinge similar to that of Fig.1, the first mounting part of the hinge lies against the (visible) surface of the door profile and the second mounting part of the hinge lies against the (less visible) edge of the door profile. There is typically a larger area at which to mount the door piece against the visible surface of the door and the first mounting part therefore typically has a larger area than the second mounting part. Also, the structure of the door profile usually means that location peg(s) which project from the second mounting part can typically be longer than location peg(s) which project from the first mounting part. It will be understood that it is preferable for the longer location peg(s) to be integral with the door piece so that they better contribute to the rigid mounting of the door piece of the hinge. Consequently, it is the shorter location pegs which are removable. Removable location pegs can nevertheless contribute significantly to the structural rigidity of the hinge. In particular, in embodiments in which the first location pegs are shorter than the second location pegs and are removable, the first location pegs can contribute significantly to the structural rigidity of the hinge mounting by virtue of the rigid internal connection provided by the fasteners passing through the fixing holes. Preferably, the door piece has additional fastener holes. The additional fastener holes are configured to accommodate additional screw fasteners to further secure the door piece to the door. In common with the known hinges, the additional fasteners are secured into the plastic profile but do not cooperate with location pegs. Preferably, there is at least one additional fastener hole through the first mounting part. In the preferred embodiments in which a removable location peg is mounted to the first mounting part, additional fasteners can also be passed through the first mounting part. Desirably, there is a removable cover for the first mounting part. The removable cover will obscure the heads of any removable location peg(s) and / or additional fasteners which pass through the first mounting part. Preferably, the second mounting part has additional fastener holes for additional screw fasteners. Desirably, there are two additional fastener holes in the first mounting part and two additional fastener holes in the second mounting part. Such an arrangement can provide two rigid internal connections between the first and second mounting parts of the door piece, two further (rigid) location pegs, and four additional screw fastenings for those mounting parts. Notwithstanding the overall increase in the number of location pegs and fasteners compared to the known hinges, the door piece of the present hinge can be of comparable size to similar known hinges. Preferably, the hinge is adjustable in three orthogonal directions. Desirably, the adjustment in a first (vertical) direction is by way of a threaded bolt which can raise and lower the door piece of the hinge relative to the frame piece. Desirably also, the adjustment in a second (horizontal) direction is by way of a threaded bolt which can adjust the horizontal spacing between the door piece and the frame piece. Desirably also, the adjustment in the third (horizontal) direction is by way of an eccentric hinge pin interconnecting the door piece and the frame piece. According to a second aspect of the invention there is provided a door hinge comprising a door piece and a frame piece interconnected by a hinge pin, the hinge pin being eccentric whereby rotation of the hinge pin relative to the frame piece adjusts the position of the door piece relative to the frame piece, the eccentric hinge pin having a non-circular end, the hinge having a removable cover for the noncircular end, the fitted cover engaging the non-circular end and being configured to prevent rotation of the eccentric hinge pin. It is known to provide an eccentric hinge pin with a non-circular end, for example a hexagonal recess, to permit rotation of the eccentric pin by way of an Allen key. According to the second aspect of the invention a removable cover for the end of the eccentric hinge pin is provided which can cooperate with the non-circular end of the hinge pin to prevent unwanted rotation of the hinge pin when the removable cover is fitted. It is therefore only necessary to provide means to prevent the fitted cover from rotating in order to prevent the unwanted rotation of the eccentric hinge pin. Preferably, the frame piece of the hinge has a recess to accommodate the removable cover. In use the removable cover can lie wholly (or at least partly) in the recess. A recess into which the removable cover can be fitted facilitates the location of the removable cover. A recess can also provide a simple means to hold the fitted cover against rotation and thereby prevent unwanted rotation of the eccentric pin. The non-circular end of the eccentric hinge pin can be a female element and the removable cover can provide a corresponding male element to fit into the noncircular end. Preferably, however, the non-circular end of the eccentric pin is a male element and the removable cover provides a corresponding female element to fit the non-circular end. Providing the non-circular end as a male element typically allows the cooperating parts of the non-circular end and removable cover to be of larger dimension and thereby able to provide greater resistance to unwanted rotation of the eccentric hinge pin. Preferably, the eccentric hinge pin has an end with a hexagonal outer surface and the removable cover has a corresponding hexagonal recess. It will be understood that with cooperating hexagonal parts the eccentric hinge pin can be retained by the cover in one of six rotational positions, the rotational positions being separated by 60°. It is expected that adjustment of the eccentric hinge pin in 60° increments will be sufficient for most applications, but alternative forms for the end of the eccentric hinge pin (for example square or octagonal) could be provided if different increments are desired. Desirably, the hinge is adjustable in the vertical direction by way of a threaded bolt. Preferably, the threaded bolt is parallel with, and adjacent to, the eccentric hinge pin. The removable cover for the non-circular end of the eccentric hinge pin can also cover and obscure the threaded bolt. In order to avoid unnecessary repetition, optional features which are described in relation to one aspect of the invention can be utilised with the other aspect of the invention where compatible. BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will now be described in more detail, by way of example, with reference to the accompanying drawings, in which: Fig.1 shows a cross-sectional view of a prior art hinge mounted to a frame and door; Fig.2 shows an exploded perspective view from the front of the hinge according to the present invention; Fig.3 shows an exploded perspective view of part of the hinge of Fig.2, from the rear; Fig.4 shows another exploded view of the part of the hinge of Fig.2, from a different perspective; Fig.5 shows a cross-section through the assembled hinge of Figs. 2-4; Fig.6 shows another view of the door piece of the hinge of the present invention; Fig.7 shows a view similar to Fig. 1 of a hinge according to the present invention; and, Fig.8 shows a perspective view of a partially-assembled hinge according to the present invention. DETAILED DESCRIPTION A description of the relevant parts of the prior art hinge of Fig. 1 is set out above and will not be repeated. Fig. 2 shows an exploded perspective view of the hinge 20 according to the present invention, and Figs. 3 and 4 shows other perspective views of the partly-assembled hinge 20. The hinge 20 comprises a frame piece 22 and a door piece 24. The frame piece 22 comprises a mounting bracket 26 and a support bracket 28. The mounting bracket 26 has two projecting location pegs 30 and three fastener holes 32. The location pegs 30 fit into holes which are preformed in the frame profile 111 (Fig.7), typically during the manufacture of the frame, in known fashion. Screw fasteners (not shown) can be passed through each of the fastener holes 32 to secure the mounting plate 26 to the frame profile 111, again in known fashion. It will be seen in particular from Figs. 4 and 5 that the mounting plate 26 is of T-section and the support bracket 28 has a corresponding T-shaped channel 34 whereby the support bracket 28 can be mounted to the fitted support plate 26 from above. As seen in Figs. 3 and 4, the T-shaped channel 34 does not extend all the way to the top of the support bracket 28, and in particular the top end of the support bracket 28 overlies the top end of the mounting plate 26 in order to limit the downwards movement of the support bracket 28 during fitment. The top end of the support bracket 28 has a threaded through opening which accommodates a correspondingly threaded adjustment bolt 36. The adjustment bolt 36 extends through the opening and into a recess 38 of the mounting bracket 26. It will be understood that rotation of the adjustment bolt 36 acts to adjust the vertical position of the support bracket 28 relative to the mounting bracket 26, and thereby adjusts the position of the support bracket 28 (together with the door piece 24) in the first direction A1. The support bracket 28 is generally C-shaped and has two aligned holes 40 (Fig.2) which can receive a hinge pin 42 (only the lower hole 40 is visible in Fig.2). A main plate 44 of the hinge 20 has a cylindrical sleeve 46 which surrounds and accommodates the central portion of the hinge pin 42 and which rotates about the hinge pin 42 in use. The cylindrical sleeve 46 is connected to a plate element 48 which is designed to be slidably located in a channel 50 of the door piece 24. The door piece 24 has a first mounting part 52 and a second mounting part 54 (see also Fig.6). The first and second mounting parts 52, 54 are at an angle to each other, and are in particular configured to engage two different parts of the door profile 103 as shown in Fig.7. It will be seen that the particular door profile 103 for which the hinge 20 is designed has a bevelled edge 56 and the mounting surface of the second mounting part 54 is at a corresponding angle (in this embodiment approx. 45°) relative to the first mounting part 52 so as to lie against the bevelled edge 56. It will be understood that a hinge designed for a door profile with a right-angle corner such as that shown in Fig. 1 would have the mounting surface of its second mounting part perpendicular to the first mounting part. The door piece 24 is secured to the door profile 103 by way of four location pegs and six fastening screws. Two second location pegs 60 (which are best seen in Fig.4) are integrally formed with the second mounting part 54 and project from the second mounting part 54. These second location pegs 60 project into preformed location holes in the profile 103, in known fashion. The second mounting part 54 has two further preformed fastener holes 62 (Figs. 4,6) which can accommodate respective fastening screws (not shown). The first mounting part 52 has two location holes 66 for respective first location pegs 68, the location pegs 68 in use passing through the location holes 66 and through preformed holes in the door profile 103. It will be seen that the first location pegs 68 each have a fixing hole 70 therethrough. In this embodiment the fixing holes 70 are plain holes but it will be understood that in an alternative embodiment the fixing holes could be threaded. The head of each of the first location pegs 68 has a marking aligned with the fixing hole 70 whereby when a first location peg 68 is inserted through its location hole 66 into the profile 103, the fixing hole 70 can be aligned with a respective fastener hole 62. A fastening screw (not shown) can then be passed through one of the preformed fastener holes 62, through the edge wall and webs of the door profile 103, and through the fixing hole 70 of a first location peg 68. The fastening screw in this embodiment is self-tapping and creates a corresponding thread in the respective fixing hole 70. When the fastener is tightened a rigid internal connection is created between the first mounting part 52 and the second mounting part 54 which effectively clamps the door piece 24 to a part of the corner of the door profile 103. Since in this embodiment there are two first location pegs 68, two rigid internal connections are created. The first mounting part 52 also has two preformed fastener holes 72 (Fig.3) which can accommodate further fastening screws (not shown). The first mounting part 52 has a removable cover 74 which can be fitted in order to obscure the heads of the location pegs 68 and the fastener screws. Figs. 3 and 4 show the adjustment bolt 76 by which the hinge 20 is adjusted in the second direction A2. The head of the adjustment bolt 76 is captive in a recess of the first mounting part 52. The threaded shank of the bolt 76 passes through a plain bore of the first part 52 and into a threaded hole 78 in the plate element 48 of the main plate 44. It will be understood that clockwise rotation of the adjustment bolt 76 moves the first part 52 to the right (in the adjustment direction A2) relative to the main plate 44 as viewed in Figs. 3 and 4 whereas counter-clockwise rotation of the adjustment bolt 76 moves the first part 52 to the left relative to the main plate 44. Movement of the first part 52 relative to the main plate 44 in the direction A2 causes corresponding movement of the door piece 24 relative to the frame piece 22. Adjustment of the hinge in the third direction A3 is provided by the eccentric hinge pin 42. It is arranged that the end bearing parts 80, 82 of the eccentric pin 42 are concentric and share a first rotation axis. In the assembled hinge 20 the end bearing parts 80, 82 are located in respective concentric holes 40 of the support bracket 28. The central bearing parts 84 of the pin 42 are concentric and share a second rotation axis which is offset from the first rotation axis of the end bearing parts 80, 82. In this embodiment the offset is 1 mm. The central bearing parts 84 are a close sliding fit inside the cylindrical sleeve 46. As the door is opened and closed relative to its frame the door piece 24 of the hinge 20 rotates around the second rotation axis as the sleeve 46 rotates around the central bearing parts 84. The top end of the eccentric pin 42 has a hexagonal recess 86 which can accommodate an Allen key. It will be understood that rotation of the eccentric pin by way of the recess 86 causes the end bearing parts 80, 82 to rotate relative to the holes 40 in the support bracket 28. Since the first rotation axis of the end bearing parts 80, 82 is offset from the second rotation axis of the central parts 84, it is also offset from the rotation axis of the sleeve 46. Accordingly, rotation of the eccentric pin 42 relative to the mounting bracket 28 adjusts the position of the sleeve 46 and thereby the position of the door piece 24 relative to the frame piece 22. It will be understood that rotation of the eccentric pin 42 adjusts the door piece 24 in both of the directions A2 and A3 together. In practice the eccentric pin 42 can be rotated to achieve the desired adjustment in the direction A3 (i.e. the desired compression of the sealing elements S), followed by the rotation of the adjustment bolt 76 to adjust the hinge in the direction A2 (the latter adjustment including countering any undesired adjustment in the direction A2 caused by rotation of the eccentric pin 42). It will be seen from Figs.2 and 8 that in addition to the hexagonal recess 86, the top end of the eccentric pin 42 has a hexagonal exterior. When assembled as shown in Figs. 3 and 4 the top end of the eccentric pin 42 lies fully within a recess 88 in the top of the support bracket 28. A removable cover 90 has a wall 92 with a hexagonal interior form matched to the hexagonal exterior of the end of the eccentric pin 42, whereby the cover 90 can be fitted over the top end of the eccentric pin 42 and into the recess 88. The cooperating hexagonal forms of the exterior of the end of the eccentric pin and the wall 92 provide six rotational positions for the eccentric pin 42 at which the cover 90 can properly be fitted into the recess 88, the six positions being separated by 60°. It will be understood that when the (non-circular) cover 90 is fitted into the (correspondingly non-circular) recess 88 it cannot rotate relative to the support bracket 28 and the wall 92 prevents unwanted rotation of the eccentric hinge pin 42. It will be understood that the removable cover could alternatively (or additionally) have a hexagonal projection (male element) for fitment into the hexagonal recess 86. A hexagonal exterior and corresponding hexagonal wall 92 are nevertheless preferred as they provide a relatively large contact area to resist unwanted rotation of the eccentric pin 42.

Claims

1. A door hinge comprising a door piece and a frame piece interconnected by a hinge pin, the door piece having a first mounting part and a second mounting part, the first and second mounting parts being at an angle to each other for fitment around a corner of a door profile, the door piece having a first location peg and a fastener hole, the first location peg having a fixing hole aligned with the fastener hole, the door piece having a second location peg, the first location peg projecting from one of the first mounting part and the second mounting part, the second location peg projecting from the other of the first mounting part and the second mounting part.

2. A door hinge according to claim 1 in which the first location peg projects from the first mounting part and the fastener hole is formed through the second mounting part.

3. A door hinge according to claim 1 or claim 2 in which the fixing hole is plain to accommodate a self-tapping threaded fastener.

4. A door hinge according to any one of claims 1 -3 in which the second location peg projects from the second mounting part.

5. A door hinge according to any one of claims 1 -4 in which the second location peg has a fixing hole.

6. A door hinge according to any one of claims 1 -5 having two first location pegs and two fastening holes, each of the location pegs having a fixing hole aligned with a respective fastening hole.

7. A door hinge according to any one of claims 1-6 having two second location pegs.

8. A door hinge according to any one of claims 1-7 in which the first location peg(s) are removably mounted.

9. A door hinge according to any one of claims 1 -8 in which the second location peg(s) are permanently mounted to the door piece.

10. A door hinge according to any one of claims 1 -9 in which the second location peg(s) are integral with the door piece.

11. A door hinge according to any one of claims 1 -10 in which the second location peg(s) are longer than the first location peg(s).

12. A door hinge according to any one of claims 1-11 in which the cross-sectional dimension of the second location peg(s) and the cross-sectional dimension of the first location peg(s) are the same.

13. A door hinge according to any one of claims 1-12 having additional fastener holes.

14. A door hinge according to claim 13 in which the additional fastener holes are formed in the first mounting part.

15. A door hinge according to claim 13 or claim 14 in which the additional fastener holes are formed in the second mounting part.

16. A door hinge according to any one claims 13-15 in which there are two additional fastener holes in the first mounting part and two additional fastener holes in the second mounting part.

17. A door hinge according to any one of claims 1-16 having a removable cover for the first mounting part.

18. A door hinge according to any one of claims 1 -17 which is adjustable in three orthogonal directions.

19. A door hinge according to any one of claims 1-18 in which the hinge is adjustable in a first direction is by way of a threaded bolt mounted to the frame piece.

20. A door hinge according to any one of claims 1-19 in which the hinge is adjustable in a second direction is by way of a threaded bolt mounted to the door piece.

21. A door hinge according to any one of claims 1-20 in which the hinge pin is eccentric, and in which the hinge is adjustable in a third direction is by way of the eccentric hinge pin.

22. A door hinge according to claim 21 in which the eccentric hinge pin has a noncircular end, in which the hinge has a removable cover for the non-circular end, and in which the removable cover when fitted engages the non-circular end and is configured to prevent rotation of the eccentric hinge pin.

23. A door hinge according to claim 22 in which the frame piece has a recess to accommodate the removable cover.

24. A door hinge according to claim 22 or claim 23 in which the non-circular end of the eccentric hinge pin is a male element and the removable cover provides a corresponding female element to fit the non-circular end.

25. A door hinge according to any one of claims 22-24 in which the eccentric hinge pin has an end with a hexagonal outer surface and the removable cover has a corresponding hexagonal recess.

26. A door hinge according to any one of claims 22-25 in which the hinge is adjustable in a first direction by way of a threaded bolt mounted to the framepiece, in which the threaded bolt is parallel with and adjacent to the eccentric hinge pin, and in which the removable cover when fitted covers the threaded bolt.

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